WO2013020827A2

WO2013020827A2 - Cable screw connection

Info

Publication number: WO2013020827A2
Application number: PCT/EP2012/064746
Authority: WO
Inventors: Markus Aumiller; Niklaus Meier
Original assignee: Agro Ag
Priority date: 2011-08-09
Filing date: 2012-07-26
Publication date: 2013-02-14
Also published as: CH705378A2; CH705378B1; WO2013020827A3

Abstract

The invention relates to a cable screw connection having a base part (1) and a sleeve nut (2) and comprising several elongate clamping pieces (15) between a cable (4) and the base part (1) or the sleeve nut (2), which pieces extend in the longitudinal direction of a longitudinal axis of the cable screw connection and which pieces are mounted such that the pieces can move at least in part radially to the longitudinal direction. At least some of the clamping pieces (15) are arranged adjacent to one another in the circumferential direction. At least some of the clamping pieces (15) have first oblique faces (5) at a first end, and at least some of the clamping pieces (15) have second oblique faces (16) at a second end opposite the first end. The first oblique faces (5) interact with a first conical region (6) on a circumferential face on the base part (1), and the second oblique faces (16) interact with a second conical region (17) on a circumferential face on the sleeve nut (2) in such a manner that, when the base part (1) and sleeve nut (2) move axially toward one another, at least the first and second ends of the clamping pieces (15) can move along the oblique faces (5; 16) radially inwardly toward the cable (4).

Description

Cable gland

The invention relates to a cable gland, for example for a cable gland or a cable entry, in particular a cable gland with a clamping device, and a clamping element for such a cable gland according to the preamble of the main claims.

Various cable glands are known from the prior art, which have a base part with an external thread, a union nut and a clamping element arranged between these two parts, which clamps on a cable that has been made. The clamping element has z. B. several clamping arms, which may be formed as wedge pieces and are movable radially to an axis of the cable gland. When screwing the base part and union nut, the clamping arms are pressed by conical surfaces on the base part or clamping element radially inwardly, whereby a clamping action is exerted on a performed cable. Such cable glands serve, for example, to strain relief of the cable z. B. at a plug connection. Furthermore, a seal of the cable gland may be necessary to protect the cable from external influences.

In DE1 0200701 791 8A1 a cable gland with a strain relief and a sealing function is described, which comprises a screw actuator and a cover which can be screwed together. Further, a retaining ring is provided with finger-like protruding clamping elements and a sealing insert which is axially adjacent to the clamping element. The clamping elements have at their free ends inclined surfaces which bear against an inner cone of the Schraubstellglieds. To fix a cable drawn through these components, the cover is rotated. The clamping elements slide on the inner cone of the actuator and are adjusted radially inward. Thus, the clamping elements clamped to the outer circumference of the cable and thus form the strain relief. At the same time, the clamping ring acts in the axial direction on the sealing insert, so that it is compressed and seals towards the cable.

From US3667783 a cable gland is known, which has two verschraubenbare screwed together and arranged therebetween a clamping element and a sealing elements, which are arranged over a cable. The clamping element comprises four segments, which are annularly connected by curved webs. The clamping elements are conical and abut against a conical surface of one of the screw elements. The sealing element is also provided with a conical outer periphery and connects axially to the clamping element. When screwing the screw the segments of the clamping element are pressed to the cable axis and enclose the cable between them. In addition, the pressure is transmitted from the clamping element to the sealing element, so that it is pressed onto the cable. It is possible to omit one of the webs in the clamping element, so that an opening is formed on the clamping element. The segments of the clamping element may have edges which are arranged so that they claw into the cable during compression of the segments and reinforce the clamping function when pulling on the cable.

In DE1 031 2749B4 a cable gland is shown, which has a pressure screw with a spherical shaped cavity and a clamping ring having a spherical outer surface, which is adapted to the spherical shape of the pressure screw. The clamping ring consists of a plurality of individual segments, which are aligned parallel to the M axis of the screw connection and formed approximately trapezoidal. The individual segments are connected by webs. The clamping ring does not act directly on a cable, but on an additional sealing insert, which is clamped when screwed to the cable.

Furthermore, from DE 2971 5822U 1 a cable gland is known, which comprises a clamping insert with clamping fingers and a contact insert with contact fingers, which each have axially in opposite directions and abut against corresponding conical pressure surfaces of the screw elements. When screwing the screw the clamping fingers and the contact fingers are pressed radially inwardly by means of the pressure surfaces at different axial locations of the cable, wherein at one point a clamping fit and at another point results in an electrical contact with the cable. Between the clamping fingers and the cable a seal is provided so that at the same time a sealing of the screw is accompanied by the clamping seat.

The combination of clamping and sealing function makes it difficult to handle the cable gland, since at the same time as the terminals on the cable for the strain relief must also be sealed, thereby increasing the force required to connect the cable gland. In addition, a precisely positioned clamping seat is impaired by the double function when screwing and the reliability of the strain relief can be reduced because the seal is elastically deformable and thus affects the clamping fit.

The clamping elements of the prior art run within the screw usually in axial guides. The clamping elements can wed during screwing within the guides and complicate the screwing. In addition, the clamping arms are often arranged at their non-clamping end usually on a rigid ring or are flat with this end on a stop. As a result, the radial mobility of the clamping arms is reduced. It is an object of the present invention to provide a cable gland, which allows easy handling when screwing and reliable strain relief for the cable, which has a compact design and is inexpensive to manufacture.

Another object of the invention is to provide a clamping element for a cable gland, which allows a secure clamping fit on the cable and allows easy screwing the cable gland.

This object is achieved by a cable gland and a clamping element according to the features of the independent claims. Advantageous embodiments and variants will become apparent from the subclaims.

A cable gland according to the present invention comprises a base part and a union nut, which are operatively connected to each other while axially movable relative to each other. For this purpose, a threaded connection can be provided between the base part and the union nut. The base part and the union nut each have a passage opening for the passage of a cable. Further, the cable gland comprises a plurality of elongated clamping pieces between the cable and the base part, or between the cable and Ü union nut, which extend substantially in the longitudinal direction of a longitudinal axis of the cable gland, arranged distributed around the longitudinal axis and at least partially mounted radially movable. The clamping pieces are advantageously designed so that they have a certain flexural rigidity, so that the clamping force is transmitted optimally. The clamping pieces can be distributed at regular or irregular intervals about the longitudinal axis. The clamping pieces may be radially movable so that an entire clamping piece or only a portion of the clamping piece, for. B. by tilting or bending, moved radially. An axis of the clamping pieces runs in Essentially parallel to the longitudinal axis of the cable gland or a cable. In principle, they can also be provided slightly obliquely to the longitudinal axis. The clamping pieces Kings nen z. B. be formed as elongated beams, which have a sufficient bending stiffness.

According to the invention, the clamping pieces are arranged at least partially in U mängsrichtung next to each other. Accordingly, the clamping pieces may be provided in the axial direction at the same height or axially offset from each other, such that only a portion of the clamping pieces overlaps in the axial direction. At least a portion of the clamping pieces has at a first end first inclined surfaces and at least a portion of the clamping pieces has at a second, opposite to the first opposite pointing in the opposite direction end second inclined surfaces. The inclined surfaces point radially outward and are designed as surfaces sloping towards the end of the clamping pieces. The clamping pieces thus form clamping arms which protrude in opposite directions. In this case, pointing in opposite directions clamping arms may be provided on the same clamping piece or on different clamping pieces and also have different lengths. The first inclined surfaces act with a first conical portion of an inner U mfangsfläche on the base part and the second inclined surfaces cooperate with a second conical area on an inner U mfangsfläche on the nut in such a way that at an axial movement of the base part and union nut on each other, at least the first and second ends of the clamping pieces are guided along the inclined surfaces and are movable radially inwards towards the cable.

When the base part and the union nut are screwed together, the base part and the union nut move axially one above the other, so that the conical regions are pressed against the oblique surfaces of the clamping pieces. The inclined surfaces can be used as wedge-shaped act, which clamp between the base part, or union nut and cable. In this case, the conical regions and the inclined surfaces act as a clamping device, in which at least the ends of the clamping pieces are pressed radially in the direction of the cable. In this operatively connected clamping position between the base part and Ü union nut between the first ends of the clamping pieces and the cable, a first clamping region and between the second ends of the clamping pieces and the cable, a second clamping region which is axially offset from the first clamping region. Both clamping areas hold the cable in the cable gland and can, for. B. act as a strain relief.

The cable gland according to the present invention allows a secure hold of the cable within the screw through two different clamping areas, which are established simultaneously with the connection of the base part and Ü union nut. The two clamping areas allow for increased strain relief. The clamping function is realized independently of a sealing function and is thus not affected by this. Furthermore, the cable gland has a simple structure.

In one embodiment of the cable gland, the first and the second inclined surfaces are formed on the same clamping piece. Accordingly, two axially offset clamping regions can be realized on the cable with the same clamping piece. The inclined surfaces at the respective ends of the plurality of clamping pieces are arranged at the same axial height. The clamping pieces may have on their inner side a recess which lies between the clamping regions of the clamping pieces. The recess may be formed of curvature or incision. The recess can facilitate the radial movement of the ends of the clamping pieces on the cable. In general, the clamping pieces are advantageously connected to one another in the circumferential direction. For this purpose, z. B. webs may be provided which may be rigid or flexible. The clamping pieces and the webs can, for. B. are made together in an injection molding, so that the clamping pieces together form a one-piece clamping element. As a result, the clamping elements can be produced in a simple manner. The clamping pieces can also be movably arranged on an elongated carrier. Thus, the clamping pieces can slip on the support and be brought into a predetermined position within the base part and Ü union nut.

In one embodiment of the cable gland according to the invention, the clamping element is at least approximately ring, resp. wreath-shaped. Preferably, an open on one side ring mold is provided. Preferably, the clamping member is so flexible that a diameter of the ring shape of the clamping member can be reduced by manual pressure or the pressure of the conical portions. Thus, on the one hand, the clamping element can be easily inserted into the base part. On the other hand, the clamping element is suitable for cables with different diameters, since it has a variable diameter by widening or reducing the opening. Furthermore, the first and second ends of the clamping pieces may be made flexible, in particular the areas with the inclined surfaces. Thus, the ends can be pressed by the conical surfaces on the cable, with only a small resistance of the clamping pieces due to their deflection arises. A middle region of the clamping pieces thus has to perform only a smaller radial movement compared to the ends. Likewise, however, the clamping pieces can be moved to the cable during the effective connection of the base part and the union nut substantially parallel to the longitudinal axis. If the clamping pieces are connected to each other, z. B. deform connecting webs, wherein the clamping pieces Kings are designed to be relatively stiff NEN. The clamping pieces, or the clamping element are, by a Positionierein direction relative to the base part, or to U union nut, positioned and at least held loose. In this case, the positioning device is provided between the base part, or union nut, and a central region of the clamping pieces, so that the two ends of the clamping pieces are freely movable.

For example, in the cable gland on at least one of the clamping pieces on a radially outwardly facing central surface at least one projection may be provided which abuts a radial shoulder on an inner circumferential surface of the base part in an axial movement relative to the base part. Preferably, two opposite radial paragraphs are provided on the inner peripheral surface, between which the at least one projection is at least partially movably mounted. The clamping pieces are preferably mounted floating between the shoulders in the axial direction, so that the clamping pieces, the base part and the union nut can move relative to each other when connecting the base part and the union nut in such a way that the conical areas can act on the inclined surfaces. By the stop the clamping pieces, or the clamping element can be positioned axially within the base part and the union nut. The inclined surfaces can be aligned with respect to the conical regions. Preferably, a projection is provided on each of the clamping pieces, so that the projections are distributed in the U mfangsrichtung. When inserting a clamping element into a base part, the projections can be easily placed between the shoulders by the flexibility of the clamping element, in particular when the clamping element has a ring shape which is opened at one point.

In one embodiment of the cable gland according to the invention, the first ends of the clamping pieces are above a first diameter of the cable and the second ends of the clamping pieces are arranged over a second diameter of the cable passed, wherein the first diameter is larger or smaller than the second diameter. For example, the first ends may overlie a portion of the cable-sheathed cable and the second ends overlie a portion of the cable where the cable sheath has been removed and an outer conductor is visible. If necessary, the outer conductor can be contacted so via appropriately conductive trained clamping pieces. For this purpose, the clamping pieces may be made of or coated with an electrically conductive material. For positioning the cable relative to the ends of the clamping pieces, a positioning aid can be used. The cable gland is therefore also suitable for cables with varying diameters. When screwing the base part and the union nut, one end of the clamping pieces form a first clamping area on a cable area with a large diameter and the other ends of the clamping pieces form a second clamping area on a cable area with a small diameter. The Klemmein direction can thus serve to fix different layers of the cable.

When the cable gland is preferably a seal between the cable and Ü union nut, or base provided, which is not operatively connected to the clamping pieces. Accordingly, the clamping pieces are preferably un indirectly between the surfaces of the base part, or U union nut, and arranged the cable surface. The seal is provided regardless of the clamping function between the cable and Ü union nut or base and thus does not affect the fixed clamping seat of the cable gland on the cable. The strain relief can thus act reliably on the cable. A seal may for example be arranged axially in front of or behind the ends of the clamping pieces. In the case of the abovementioned cable glands, an anti-twist device for the clamping pieces, or the clamping elements, can also be provided, which prevents the cable from twisting inside the cable gland as soon as the clamping device acts. The rotation can, for example, be a cage-like component, on the one hand engages at least partially between two or more clamping pieces and on the other hand is supported on the base part or Ü union nut. The cage-like component rests against at least one longitudinal side of the clamping pieces for blocking a rotation of the clamping pieces or of the clamping element. Furthermore, in the clamping position of the cable gland, it is held in a friction-locked or positive-locking manner, preferably on the base part or else on the union nut. The cage-like component can, for. B. consist of a material with a high coefficient of friction or be coated with such. The component can thus be in the clamping position a frictional engagement with an inner surface of the base part, z. B. with the conical peripheral surface or a cylindrical lateral surface. Such a component does not hinder the clamping function between the clamping pieces and the base part or the union nut, since it does not come to rest between these components and does not restrict the mobility of the clamping pieces. Basically, it is also conceivable as rotation to provide an axial stop in U mfangsrichtung on the base part or Ü union nut against which strike the clamping pieces, or the clamping element in a twisting inside the cable gland.

According to a further aspect of the present invention, a cable gland is provided with a base part and a union nut, as described above, which has a plurality of elongated clamping pieces between the cable and the base part, or union nut, which extend in the longitudinal direction of a longitudinal axis of the cable gland. arranged distributed about the longitudinal axis and at least partially mounted radially movable. In this cable gland, the clamping pieces have a slant at one end. surface, which cooperates with an inner conical U mfangsfläche on one of the base part and Ü union nut, and at the opposite end to a curved or rounded end surface which cooperates with a substantially radially extending to the longitudinal axis abutment surface on the other of the base part and Ü union nut , The curved end surface is substantially not flat on the stop surface, but contacts the stop surface only in a stop point or a stop line on its curvature. Thus, the end of the clamping pieces on the stop surface in a simple manner roll or slide, whereby a tilting of the clamping pieces is facilitated relative to the base part.

The curved end surface can z. B. be provided as at least approximately cylindrical surface, so that there is a line of contact on the stop surface. It can also form a spherical surface, which forms a contact point on the stop surface.

The curved end surface is predominantly aligned in the axial direction, so that the end face of the clamping pieces abuts the stop surface both in the initial state and in a clamping state after the screwing together of base part and Ü union nut. The stop surface may be perpendicular to the longitudinal axis or slightly conical.

By such a cable gland, the screwing of Ü union nut on the base part is facilitated and at the same time a secure strain relief is possible.

As previously described, the clamping pieces of the cable gland can be connected to each other in the circumferential direction. The clamping pieces Kings together NEN form a one-piece clamping element, which may be annular, in particular may have an opened on one side ring shape. A positioning device can be provided between the clamping pieces and the base part and / or the union nut. On at least one of the clamping pieces may be provided on a radially outwardly facing surface at least one projection which can abut a radial shoulder on the inner peripheral surface of the base part in an axial movement relative to the base part. The at least one outer projection may be axially movably mounted on the inner peripheral surface between two opposite radial shoulders. Upon tilting or bending of the clamping pieces, the projection may come out radially inwardly from the space between the shoulders. The axial positioning of the clamping pieces or of the clamping element within the cable gland is also ensured by the abutment of the end face on the stop surface.

In one embodiment of the cable gland may be provided on an inner surface of the clamping pieces near the curved end surface a radially inwardly projecting projection which rests on the cable and serves as a tilting point of the clamping pieces in the effective connection of the base part and Ü union nut. The inner projection is preferably provided in the region of the connection of the clamping pieces, so that the clamping pieces move substantially around the tilting point and the connection. Further, a seal may be provided as described above.

In the cable glands according to the present invention, for. As well as clamping elements of different sizes, ie, for example, with different circumference or different la ngen clamping pieces, are provided so that a suitable clamping element is selected for a particular cable and can be used between the base part and U union nut. Furthermore, the clamping pieces of a clamping element may have a different flexibility. The connection of Clamping pieces may be formed by connecting webs of different thicknesses or of different flexible or dereformable ones. In this way, different cable requirements can be met with the same base part and the same union nut and a reliable clamping function of the cable can be realized within the cable gland.

In the illustrated embodiments of a cable gland according to the present invention, a connection of the base part and Ü union nut is provided as a threaded connection. In principle, however, another connection can be provided, such as a bayonet connection or a plug connection.

According to yet another aspect of the invention, a clamping member for a cable gland as described above is proposed, which comprises a plurality of clamping pieces which are connected in the circumferential direction about a longitudinal axis of the cable gland, wherein between the clamping pieces connecting webs are provided which are deformable. The connecting webs preferably have at least one taper. The tapers support the mobility of the clamping element and thus the clamping pieces. Both when inserting a clamping element into a base element of the cable gland and when pressing the clamping pieces onto a cable, the tapers in the connecting webs increase the flexibility of the clamping element and facilitate the handling of the cable gland. The tapers act as bending points for the deformation when clamping or compressing an annular clamping element.

The tapers can be provided in the circumferential direction and / or radial direction. The taper can be provided as a thin point in the material of the connecting webs. The thin areas may be formed as material recesses, the are provided both on the inner and on the outer side of a connecting web and / or one or both axially aligned sides of the connecting webs. Preferably, the connecting webs are formed integrally with the clamping pieces. The connecting elements form the clamping element into a ring shape, which can be opened between two clamping pieces. Preferably, the at least one taper is provided spaced from the clamping pieces, so that a movable portion of the connecting webs is located away from the clamping pieces.

According to one embodiment, the opening between two clamping pieces can be closed by a closure device. H herefor, a connecting web between two clamping pieces may be formed by two web elements, each of which protrude from opposing clamping pieces and which are connectable to each other with the closure device. The closure device may, for. B. be provided as a positive or frictional connection. A closure device may, for. B. be realized by a key / lock principle, wherein at the end of a rod member a key shape and at the end of the opposing other web member a lock shape is formed. Key and lock shape can be brought in the radial direction in engagement, so that the web elements are held in the U mfangsrichtung fixed relative to each other and preferably detachable. Alternatively it can be provided as a closure device, a latching or snap connection between the web elements.

A clamping element with a closure device between two web elements forms an advantageous embodiment even without a taper in the connecting webs. With the aid of the closure device, a clamping element manufactured in one plane can be bent to form an annular clamping element and held in the ring shape. It therefore remains reserved to make an independent claim to such a clamping element. Preferred embodiments of the invention will now be described with reference to the drawings, which are given by way of illustration only and are not to be construed as limiting. Aspects of the invention disclosed in the drawings are to be considered individually and in any combination as belonging to the disclosure of the invention. In the drawings: show a first embodiment of a cable gland according to the present invention in a closed state in a

Partial section;

FIG. 2 shows the cable gland according to FIG. 1 as an exploded view; FIG.

Fig. 3: a second embodiment of a cable gland according to the present invention in the closed state in a partial section;

Fig. 4: the cable gland of Figure 3 as an exploded view;

Fig. 5a) and b): Variants of a clamping element for a cable gland according to Figures 3 and 4 in a three-dimensional view; and

Fig. 5c) and 5d): Variants of a clamping element for a cable gland according to Figures 1 and 2 in a three-dimensional view.

In the figures, two different embodiments of a cable gland according to the present invention are shown. Identical components are designated in the respective embodiment with the same reference numerals. In Figures 1 and 2, a first embodiment of a cable gland according to the present invention is shown with a clamping device for clamping a cable in the cable gland. The cable gland comprises a base part 1, a union nut 2 and a plurality of elongate clamping pieces 3. The base part 1 and the union nut 2 each have a passage opening for the passage of a cable 4. The clamping pieces 3 extend between the cable 4 and the base part 1, or between the cable 4 and Ü union nut 2, in the longitudinal direction of a longitudinal axis in the direction X of the cable gland and are distributed around the longitudinal axis. The clamping pieces 3 are at least partially mounted radially movable within the cable gland and have at one end first inclined surfaces 5. The inclined surfaces 5 act in the embodiment shown with a conical portion 6 of an inner U mfangsfläche on Ü union nut 2 together. Alternatively, the region 6 may also be formed as an edge, which cooperates with the first inclined surface 5. Depending on the embodiment, the edge can also be formed on the clamping piece 3.

At the opposite end of the clamping pieces 3 a generally curved end surface 7 is provided, which cooperates with a substantially radially aligned to the longitudinal axis stop surface 8 on the base part 1 together. The closing surface 7 is advantageously provided as an at least approximately cylindrical surface. In principle, the conical region 6 could also be provided on the base part 1 and the abutment surface 8 on the union nut 2. In this case, the clamping pieces 3 are inserted axially reversed in the cable gland.

The abutment surface 8 may extend perpendicular to the longitudinal axis or be formed slightly conical. The inclined surface 5 and the conical peripheral area 6 advantageously have the same angle to the longitudinal axis. The base part 1 and Ü union nut 2 can z. B. as turned parts made of metal or by injection molding made of plastic. The conical region 6 can be provided as an inwardly directed conical surface. Between the base part 1 and Ü union nut 2, a thread is provided in order to connect the two parts detachably with each other. On the outside of the base part 1, a first sealing ring 9 is mounted in a circumferential groove U. In operatively connected state of base part 1 and Ü union nut 2 Überla ppt an inner surface of Ü union nut with the sealing ring 9 and is firmly attached to this, with a seal between the base part 1 and U union nut 2 takes place. In the embodiment shown, another sealing means 10 encloses the union nut 2 and closes between union nut 2 and cable 4. Other seals can be provided as needed.

The clamping pieces are connected by connecting webs 1 1 in U mfangsrichtung together. The clamping pieces 3 together form a clamping element 1 2, which is preferably formed in one piece and annularly shaped or can be bent into a ring shape. On one inner surface of the clamping pieces 3 near the flat or curved end surface 6 one (or more) radially inwardly projecting projection 1 3 is provided, which can lie on the cable 4 depending on the cable diameter in the effective connection of base part 1 and Ü union nut 2. The clamping pieces 3 may advantageously be designed according to one of the embodiments according to the figures 5c or 5d.

When screwing together base part 1 and Ü union nut 2, the inclined surfaces 5 of the clamping pieces 3 come to rest on the conical portion 6 of Ü union nut 2 and the curved end surfaces 7 of the clamping pieces 3 encounter in the axial direction against the stop surface 8 of the base part. In the process, the end surfaces 7 impinge on a contact line on the stop surface 8. Slip on further screwing together the inclined surfaces 5 at the conical regions 6, so that the end of the clamping pieces 3 moves with the inclined surface 5 radially inward. In this case, the clamping pieces 3 about the projection 1 3, which rests on the cable 4, tilted. At the same time, the end surface 7 tilts on the abutment surface 8, the contact line traveling along the end surface. In this case, the inside of the clamping pieces 3 is pressed against the cable 4 and there is a clamping fit, or wedging, between the cable 4 and the ends of the clamping pieces. 3

By rolling, or sliding of a curved end surface 7 on the stop surface 8, the clamping pieces 3 can be tilted within the base part in a simple manner without much resistance. In contrast to a flat end face while the clamping pieces 3 must be bent less, but as a whole can change their angle relative to the base part 1 easier. As a result, the clamping fit can be improved and the connection of the base part and the union nut can be facilitated.

In Figures 3 and 4, a second embodiment of a cable gland according to the present invention is shown. It is again a base part 1 and a Ü union nut 2 are provided, which are operatively connected to each other while axially movable. Through openings a cable 4 is guided. Furthermore, a clamping device with a clamping element 1 4 is provided, the z. B. according to one of the figures 5a or 5b is formed and comprises a plurality of clamping pieces 1 5. The clamping pieces 15 are arranged in the circumferential direction next to one another and parallel to one another and lie at the same axial height here. The clamping pieces each have a first end, on which an outwardly directed first inclined surface 5 is provided, and a second end which lies opposite the first end and has a second outwardly facing inclined surface 1 6. The first inclined surface 5 and the second inclined surface 16 are formed in this embodiment on the same clamping piece. The clamping pieces 1 5 are connected with tion webs 1 1 connected to each other, which are provided substantially centrally of the clamping pieces. The clamping element 1 4 thus has two clamping arms, which are aligned starting from the connecting webs 1 1 in opposite axial directions. In this case, the inclined surfaces 5 are formed at the ends of the clamping arms, which point in the direction of Ü union nut, and the inclined surfaces 1 6 formed at the ends of the oppositely extending clamping arms, facing in the direction of the base part.

When screwing together base part 1 and Ü union nut 2, the first inclined surfaces 5 cooperate with a first conical portion 6 of a U mfangsfläche on the base part 1 and the second inclined surfaces 1 6 cooperate with a second conical portion 1 7 on a peripheral surface of the U union nut 1 together , Upon further connection of base part 1 and Ü union nut 2, these move axially towards each other. In this case, at least the first and second ends of the clamping pieces are pressed with the inclined surfaces 5 and 1 6 along these radially inwardly on the cable. In this case, the connecting webs of the clamping pieces can be deformed, z. B. compressed. In this clamping position, in which the base part 1 and the Ü union nut 2 are operatively connected to each other, there is a first clamping region 1 8 between the first inclined surfaces 5 and the cable 4 and a second clamping region 1 9 between the second inclined surfaces 1 6 and the cable 4, which is arranged axially offset from the first clamping region 1 8.

For positioning of the clamping element 1 4 within the cable gland, a positioning device may be provided. For this purpose, in a middle region between the first inclined surface 5 and the second inclined surface 16, the clamping pieces 3 have an outer surface 20 pointing radially outwards, oriented essentially parallel to the longitudinal axis, on which a projection 2 1 is provided. On an inner peripheral surface of the Base part 1, two opposing radial shoulders 22 are arranged, between which the projection 2 1 is mounted at least partially movable. The paragraphs 22 and the projection 2 1 together form the position iereinrichtung for the clamping element 1 4 within the base part 1, in which the clamping element 1 4 is kept loose until Ü union nut 2 is operatively connected to the base part 1. The clamping element 1 4 is floatingly mounted with a certain clearance between the shoulders 22, so that it is positioned in the operative connection of the base part 1 and U union nut 2 such that the conical areas can attack substantially simultaneously on the opposite inclined surfaces. In the effective connection of the base part and the union nut, the clamping pieces as a whole can be moved radially inwards, wherein the projections 2 1 are moved out of engagement between the shoulders 22. In principle, it is also possible that bend the clamps and in the first line ie the ends are moved radially towards the cable.

FIGS. 5a) to 5d) show various clamping elements 1 2 and 1 4. According to the present invention, the clamping pieces 3, or 1 4 of the clamping elements in the circumferential direction at least partially connected to a longitudinal axis of the cable gland. Between the clamping pieces 3, or 1 4 connecting webs 1 1 are provided, which have at least one taper and are deformable. At the tapers, the flexibility and mobility of the connecting webs 1 1 is increased compared to a bridge without tapers. This applies both to a bending of the webs in the axial or radial direction and for a rotation of the connecting webs.

FIGS. 5a) and 5b) show two clamping elements 1 4 and 1 4 ', as used for a cable gland according to FIGS. 3 and 4. In Figure 5a) between four clamping pieces 1 5 four connecting webs 1 1 are provided, so that the clamping element 1 4 has a closed ring shape. In Figure 5b) are between the four clamping pieces 1 5 only three connecting webs 1 1 provided so that the clamping element 1 4 'has an open ring shape. The webs 1 1 here each have two tapers 23, which are formed as radially extending thin areas. At the tapers 23, the outer and the inner side of the connecting webs 1 1 a recess or notch on. The thickness of the connecting webs 1 1 is therefore lower in the region of the tapers 23.

When compressing the clamping element, z. B. when screwing the screw, the region lying between the tapers 23 of the connecting webs 1 1, for example, escape to the outside, so that the diameter of the ring shape of the clamping element is reduced. Thus, the clamping pieces 1 5 can be moved at least approximately parallel radially inward and must be bent less than at a substantially constant ring diameter.

In the clamping element 1 4 'of Figure 5b) with the open ring shape, it is also possible to reduce the ring diameter by moving the clamping pieces, which adjoin the opening to each other.

FIGS. 5c) and 5d) show two clamping elements 1 2 and 1 2 ', as used for a cable gland according to FIGS. 1 and 2. In Figure 5c), four connecting webs 1 1 are provided between four clamping pieces 3, so that the clamping element 1 2 has a closed ring shape. The connecting webs 11 have tapers 24 in the circumferential direction at the edges, so that the width of the connecting webs 11 is narrower. In addition, in the region of the tapers 24, a radially extending taper in the manner of the tapers 23 may be provided. The tapers 24 allow a simple bending of the connecting webs 1 1 in the axial direction. As a result, the tilting in a cable gland according to the figures 1 and 2 relieved. In principle, the clamping element 1 2 could be provided as an open ring shape, if a web 1 1 is left out.

The clamping element 1 2 'of Figure 5d) has a connecting web 1 1 between two clamping pieces 3, which is formed by two web members 25 and 26 which are operatively connected by a closure device 27 with each other. The closure device is realized by a key / lock connection. For this, a key element is provided at the end of the rod element 26 and a key element at the end of the rod element 26, wherein the key element engages in the lock element such that the web elements 25 and 26 are firmly connected in their longitudinal direction, but z. B. can be solved in the radial direction. The closure device may also be designed as a snap connection, which snaps in a non-positive fit during assembly of the web elements 25 and 26. The remaining connecting webs 1 1 z. B. according to the webs of Figure 5c) may be formed.

The clamping elements 1 2, 1 2 'and 1 4, 1 4' may have on their inside ribs 28 or other traktionserhöhende elements. The ribs 28 are provided at least at the ends of the clamping pieces 3 and 1 5, which form the clamping region with a cable. The ribs can intervene in a clamping position of the clamping elements in the outer area of the cable and improve the strain relief.

The clamping elements can, for. B. are made by injection molding of plastic, so that the clamping pieces and the connecting webs are integrally formed. The clamping elements can be manufactured in a planar form (eg band-shaped) and subsequently brought into a ring shape. The tapers facilitate the bending of the clamping elements. By the closure device on the web elements, a clamping element can be held in the ring shape. In the ring form, the Clamping element z. B. are used in a base part of a cable gland in which it is held by the projections 2 1. In the production of the clamping seat with the cable, the ring shape can remain closed or the closure device 27 is opened by the movement of the clamping pieces again, for example by a radial movement of the clamping pieces.

The features of the clamping elements have been explained with reference to the embodiments of a cable gland according to Figures 1 and 2, and 3 and 4 respectively. Of course, the individual features of the clamping elements can also be used expediently in the respective other embodiment, so that the clamping elements are not limited to use in only one of the cable glands.

LIST OF REFERENCE NUMBERS

1 base part 20 middle outer surface

2 union nut 2 1 projection

3 Clamp 22 paragraph

4 cables 23 rejuvenation

5 inclined surface 24 rejuvenation

6 conical area 25 bar element

7 curved end surface 26 web element

8 stop surface 27 closure device

9 sealing ring 28 ribs

1 0 sealant

1 1 connecting bridge

1 2, 1 2 'clamping element

1 3 ahead

1 4, 1 4 'clamping element

1 5 clamping pieces

1 6 inclined surface

1 7 conical area

1 8 first clamping area

1 9 second clamping area

Claims

claims

1. Cable gland with a base part (1) and a union nut (2), which are operatively connected to each other while axially movable and each having a passage opening for the passage of a cable (4), comprising:

(A) a plurality of elongated clamping pieces (15) between the cable (4) and base part (1), or union nut (2) extending in the longitudinal direction of a longitudinal axis of the cable gland, are arranged distributed about the longitudinal axis and at least partially movable radially to the longitudinal direction are stored, wherein

(B) the clamping pieces (15) are arranged at least partially in the circumferential direction next to each other,

(c) at least a part of the clamping pieces (15) has at a first end first inclined surfaces (5) and at least a part of the clamping pieces (15) at a second, the first opposite end second inclined surfaces (16),

(d) wherein the first inclined surfaces (5) with a first conical region (6) on a peripheral surface on the base part (1) and the second inclined surfaces (16) with a second conical region (17) on a peripheral surface on the union nut (2). cooperate in such a way that upon axial movement of base part (1) and union nut (2) towards each other at least the first and second ends of the clamping pieces (15) along the inclined surfaces (5; 16) radially inwardly on the cable (4) to move are.

2. Cable gland according to claim 1, characterized in that in an operatively connected clamping position between the base part (1) and union nut (2) between the first ends of the clamping pieces (15) and the cable (4) a first clamping region (18) and between the second Ends of the clamping pieces (15) and the cable (4), a second clamping portion (19) which is axially offset from the first clamping portion (18) is arranged.

3. Cable gland according to claim 1 or 2, characterized in that di the first inclined surface (5) and the second inclined surface (16) on the same clamping piece (15) are formed.

4. Cable gland according to one of the preceding claims, characterized in that the clamping pieces (15) are interconnected in the circumferential direction and together form a clamping element (14), which is preferably formed in one piece.

5. Cable gland according to the preceding claim, characterized in that the clamping element (14) is annular.

6. Cable gland according to claim 4 or 5, characterized in that the clamping element (14) has an open on one side ring shape.

7. Cable gland according to one of the preceding claims, characterized in that a positioning device (21, 22) for positioning the clamping pieces (15) relative to the base part (1), or the union nut (2), see pre, between the base part, or . Union nut, and a central region (20) of the clamping pieces (15) is provided.

8. Cable gland according to one of the preceding claims, characterized in that at least one of the clamping pieces (1 5) on a radially outwardly facing surface (20) at least one projection (2 1) is provided which on a radial shoulder (22) on the inner peripheral surface of the base part in an axial movement relative to the base part (1) can strike.

9. Cable gland according to claim 8, characterized in that the at least one projection (2 1) between two opposite radial shoulders (22) is movably mounted on the inner peripheral surface of the base part.

1 0. Cable gland according to one of the preceding claims, characterized in that a seal (1 0) between the cable (4) and U union nut (2), or base part (1) is provided, which is not wirkverbun with the clamping pieces.

1 1. Cable gland according to one of the preceding claims, characterized in that the first and second ends of the clamping pieces (1 5) are designed to be flexible.

1 2. A cable gland according to one of the preceding claims, characterized in that the first ends of the clamping pieces (1 5) over a first diameter of the cable carried out (4) and the second ends of the clamping pieces (1 5) over a second diameter of the cable performed are arranged, wherein the first diameter is larger or smaller than the second diameter. Cable gland having a base part (1) and a union nut (2), which are operatively connected to one another and axially movable relative to one another and each have a passage opening for the passage of a cable (4), comprising: (a) a plurality of elongate clamping pieces (3) between cable and Base part (1), or

Union nut (2) extending in the longitudinal direction of a longitudinal axis of the cable gland, are arranged distributed about the longitudinal axis and are mounted at least partially movable radially to the longitudinal direction, wherein

(B) the clamping pieces (3) at one end inclined surfaces (5), the surface with a conical portion (6) of an inner Umfangsf on one of base (1) and union nut (2) act together, and at the opposite end a termination surface (7) which cooperate with a substantially perpendicular to the longitudinal axis extending abutment surface (8) on the other of the base part (1) and union nut (2).

Cable gland according to claim 13, characterized in that the stop surface (8) is designed as a conical peripheral surface.

Cable gland according to claim 13 or 14, characterized in that on an inner surface of the clamping pieces (3) near the curved end surface (8) a radially inwardly projecting projection (13) is provided, which serves as a tilting point of the clamping pieces (3) on the cable (3). 4) during the effective connection of base part (1) and union nut (2).

16. Clamping element for a cable gland comprising a plurality of clamping pieces (3; 15) which are connected in the circumferential direction about a longitudinal axis of the cable gland, characterized in that between the clamping pieces (3; 15) connecting webs (11) are provided which at least one Rejuvenation (23, 24) have.

17. Clamping element according to claim 16, characterized in that the at least one taper (23; 24) is provided in the circumferential direction and / or radial direction.

18. Clamping element according to claim 16 or 17, characterized in that the at least one taper (23; 24) spaced from the clamping pieces (3; 15) is provided.

19. Clamping element according to one of claims 16 to 18, characterized in that the connecting webs (11) are formed integrally with the clamping pieces (3, 15).

20. Clamping element according to one of claims 16 to 19, characterized in that a connecting web (11) between two clamping pieces (3; 15) by two web elements (25, 26) is formed, which by a closure device (27) are connected to one another.