US2331409A - Cable connector - Google Patents

Description

Oct. 12, 1943. R. 1. MARKEY CABLE CONNECTOR Filed Nov. 11, 1942 FIG.2.

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A T TOR/VEY Patented Oct. 12, 1943 UNITED STATES PATENT OFFICE CABLE CONNECTOR Roscoe I. Markey, East range, N. 3., assignor to Pollak Manufacturing Company, Arlington, N. J., a corporation of New Jersey I Application November 11, 1942, Serial No. 465,282

- 1 Claim. (01 ;173-322) The invention relates to cable connectors.

Connectors of this type are used when it is desired to provide a separable connection between two cables each carrying a plurality of electric connecting wires or between one such cable and a stationary member.

The principal object of the present invention is to provide a cable connector of extreme simplicity and having a minimum number of parts so that it readily lends itself to economies of manufacture and ease of assembly. Due to its simplicity the connector is foolproof, short circuiting is avoided and it may be easily taken apart for inspection or repairs.

Other objects and advantages of the invention will become apparent as this specification proceeds. Referring to the drawing forming a part thereof and in which one form of the invention is illustrated:

Fig. 1 is a longitudinal sectional view with parts in elevation;

Fig. 2 is an end elevation;

Fig. 3 is an end elevation, the cable being in section, looking from the opposite end from that illustrated in Fig. 2;

Fig. 4 is a cross-sectional view taken on line 4--4 of Fig. 1;

Fig. 5 is a detail longitudinal section of the shell; and

Fig. 6 is a detail longitudinal section of the bushing.

Referring again to said drawing the reference numeral l0 designates a housing which is provided with a shoulder I l at its intermediate portion. The shoulder ll acts to prevent longitudinal movement of a freely rotatable nut i2.

The housing ID has an internal shoulder i3 against which one end of an insert I l abuts. A removable locking ring l5 engages the other end of the insert M to hold it in position. The conventional contact pins l6 are molded into the insert. These pins contact with openings in a conventional male member (not shown) which is drawn in position and held there by the freely rotatable nut l2.

The housing i0 is threaded at its inner end at I! for the reception of a shell Ill. The end of the shell I8 remote from the threaded portion has a frustro-conical shaped interior l9 which terminates in an opening 20 through which the cable or conduit 2| freely passes. The conductors 22 carried by the cable are soldered to the inner ends of the contact pins Hi.

It is essential to provide a means for firmly gripping the cable so as to eliminate any strain on the connections between the conductor and this means forms an important feature of this invention. A bushing 25 formed of fiber or a plastic,although metal is not precluded, is housed in the shell [8. One-end of this bushing is frustro-conical in shape as shown at 26 and engages the frustro-conical shaped interior portion I9 01 the shell I8. The bushing has a plurality of slots 21 which extend substantially the length thereof. The bushing might be made in two or more pieces but it is considered advantageous to have it formed of one piece so that when the ca- .ble connector i disassembled for inspection 0 repairs it will remain on the cable. The bushing has an opening 28 which is of sufficient diameter to permit of the cable passing freely through it when the connector is disassembled. The other end of the bushing engages the inner end of the housing l0 and if desired it may be provided with a shoulder 29, the part beyond this shoulder seating in the housing. It will thus be apparent the bushing is positively confined between the interior frustro-conical shaped portion of the shell and the end of the housing.

From an inspection of Fig. 5 it will be noted that the angle of the frustro-conical portion of the shellin relation to its axis is on the order of 30 and as shown in Fig. 6 the angle of the frustro-conical shaped portion of the bushing in relation to its axis is on the order of 22. Thus when the shell is screwed home the angle of the frustro-conical' shaped portion of the bushing is forced to assume that of the shell as shown in Fig. 1. The bushing will thus be caused to grip the cable with great intensity and thus positively eliminate any strain on the connect-ions between the contact pins and the conductors. Due to the fact of the slots extending substantially the length of the bushing, the effect in reality is that of a plurality of fingers or arms impinging on and tightly gripping the cable about its entire diameter and for an effective length.

The sleeve is slabbed off at its end regions as indicated at 30 in Figs. 1 and 3 to enable a wrench to be applied thereto to screw it into potaching nut or shell l8 ha a smooth exterior surface. With the foregoing arrangement any Iclaim: A cable connector having in combination, a

housing, a freely rotata 1e nut mounted on said housing, a shell having ne end threaded onto said housing, the end of the shell remote from the threaded portion having a frusti'o-conical shaped interior, an insert carried by said housing said insert being provided with a plurality of contact pins, a bushing, one portion of which is frustro-conical in shape and the balance cylindrical and a plurality of slots extending substantially the length of the bushing, said bushing being confined between the end or the housing and the shell, the end of the cylindrical portion of said bushing abutting the end of the housing and the Irustro-conical portion 0! said bushing engaging the frustro-conical interior portion of said shell so that when said shell is screwed into position the bushing will firmly grip a cable or com duit entering said cable connector, the cylindrical portion of said bushing being provided with a chamber for the reception of the inner ends of said contact pins and the conductors carried by said cable.

ROSCOE I. MARKEY.

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