US20130152541A1 - Wire rope - Google Patents
Wire rope Download PDFInfo
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- US20130152541A1 US20130152541A1 US13/722,234 US201213722234A US2013152541A1 US 20130152541 A1 US20130152541 A1 US 20130152541A1 US 201213722234 A US201213722234 A US 201213722234A US 2013152541 A1 US2013152541 A1 US 2013152541A1
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- United States
- Prior art keywords
- strand coil
- wire rope
- metal wires
- gaps
- strand
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
- D07B1/0693—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core having a strand configuration
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/32—Surgical cutting instruments
- A61B17/320016—Endoscopic cutting instruments, e.g. arthroscopes, resectoscopes
- A61B17/32002—Endoscopic cutting instruments, e.g. arthroscopes, resectoscopes with continuously rotating, oscillating or reciprocating cutting instruments
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C1/00—Flexible shafts; Mechanical means for transmitting movement in a flexible sheathing
- F16C1/02—Flexible shafts; Mechanical means for transmitting movement in a flexible sheathing for conveying rotary movements
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/32—Surgical cutting instruments
- A61B17/320016—Endoscopic cutting instruments, e.g. arthroscopes, resectoscopes
- A61B17/32002—Endoscopic cutting instruments, e.g. arthroscopes, resectoscopes with continuously rotating, oscillating or reciprocating cutting instruments
- A61B2017/320032—Details of the rotating or oscillating shaft, e.g. using a flexible shaft
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2015—Strands
- D07B2201/2024—Strands twisted
- D07B2201/2029—Open winding
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2015—Strands
- D07B2201/2024—Strands twisted
- D07B2201/2029—Open winding
- D07B2201/203—Cylinder winding, i.e. S/Z or Z/S
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2015—Strands
- D07B2201/2024—Strands twisted
- D07B2201/2029—Open winding
- D07B2201/2031—Different twist pitch
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2401/00—Aspects related to the problem to be solved or advantage
- D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
- D07B2401/2005—Elongation or elasticity
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B5/00—Making ropes or cables from special materials or of particular form
- D07B5/005—Making ropes or cables from special materials or of particular form characterised by their outer shape or surface properties
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2316/00—Apparatus in health or amusement
- F16C2316/10—Apparatus in health or amusement in medical appliances, e.g. in diagnosis, dentistry, instruments, prostheses, medical imaging appliances
Definitions
- the disclosed embodiments relate to a medical device. More specifically, the disclosed embodiments relate to wire ropes.
- Wire ropes are multi-strand coils formed by twisting multiple wires together (see FIG. 7 ).
- Japanese Unexamined Patent Application Publication No. 9-49517 discloses a structure of a flexible shaft including a core shaft. In this structure, wires are each helically wound around the core shaft while having minute gaps between turns of the wires
- Japanese Unexamined Patent Application Publication No. 2001-280333 discloses a flexible shaft in which at least one of an outer-layer wire and an inner-layer wire is wound while having regular gaps between turns of the wire.
- Japanese Unexamined Patent Application Publication No. 7-14448 discloses a method of manufacturing a multilayer cable in which multiple core wires, serving as an inner layer, are twisted together in a direction that is opposite to the direction in which multiple core wires, serving as an outer layer, are twisted together.
- the existing wire ropes particularly the multi-strand coils, have the following drawbacks.
- a force is applied to a wire rope in such a direction as to twist or untwist the wire rope around the axis while the wire rope is bent, the wires are heated by frictional heat due to the wires rubbing against each other or by heat due to plastic deformation. Thus, the wires may become deformed or cut.
- the flexible shaft disclosed in Japanese Unexamined Patent Application Publication No. 9-49517 has excellent flexibility since gaps are provided between turns of each wire.
- each of the layers of the flexible shaft is constituted by a single wire.
- heat is generated in the shaft and the wires may be cut as a result of the heat generated.
- cutting the wires severely degrades the durability of the flexible shaft and the flexible shaft may be broken.
- the wires are wound while having gaps between some adjacent turns of the wires in the longitudinal direction.
- the remaining part, other than the one wound with the gaps is tightly wound. Since the tightly wound part of the wires of the flexible shaft suffers from heat generated therein, the durability of the whole flexible shaft is greatly reduced.
- the wires are each wound with no gaps between turns.
- the cable is more likely to experience increased heat, and therefore also exhibits reduced durability, as in the flexible shafts described in Japanese Unexamined Patent Application Publication Nos. 9-49517 and 2001-280333.
- an object of the exemplary embodiments is to provide a wire rope that has excellent durability and excellent flexibility by reducing, or preventing wires from rubbing against each other to thereby suppress heat generation.
- a wire rope in an aspect, includes a multi-strand coil formed by twisting a plurality of metal wires together, and gaps are located between the plurality of metal wires along an axis of the multi-strand coil.
- the wire rope according to the disclosed embodiments of the present invention exhibits higher durability than the existing wire ropes.
- the wire rope according to the embodiments of the present invention has higher durability and excellent flexibility by gaps being provided between turns of each of metal wires to prevent heat generation due to friction between the metal wires when the wires are bent.
- FIG. 1 schematically illustrates a wire rope according to a first embodiment when viewed in vertical section.
- FIG. 2A is a graph showing performance test results of both the wire rope according to the embodiments of the present invention and a related art wire rope.
- FIG. 2B is a schematic diagram of a configuration for the test depicted in FIG. 2A .
- FIG. 3 schematically illustrates a wire rope according to a second embodiment when viewed in vertical section.
- FIG. 4 schematically illustrates a wire rope according to a first modification of the second embodiment when viewed in vertical section.
- FIG. 5 schematically illustrates a wire rope according to a second modification of the second embodiment when viewed in vertical section.
- FIG. 6 schematically illustrates a wire rope according to a third modification of the second embodiment when viewed in vertical section.
- FIG. 7 schematically illustrates a related art wire rope when viewed in vertical section.
- a wire rope 1 A includes a multi-strand coil 10 formed by twisting multiple metal wires 11 together.
- the materials of the metal wires 11 are not limited to any particular type of material, so long as the materials exhibit high hardness. Accordingly, the materials of the metal wires may include, but are not limited to stainless steel wires, carbon steel wires, steel wires for springs, or any other metal exhibiting a hardness that is at least as high as the hardness of steel.
- Gaps are located between the metal wires 11 of the multi-strand coil 10 along the axis of the multi-strand coil 10 . Accordingly, the metal wires 11 are arranged so that the metal wires do not contact one another (i.e., without touching each other).
- the gaps between the metal wires 11 include gaps d 1 and d 2 that differ in width.
- the gaps between the metal wires 11 include narrow gaps d 1 and wide gaps d 2 , which are wider than the narrow gaps d 1 .
- locating gaps between the metal wires 11 improves the flexibility of the wire rope 1 A. This is because, when the wire rope 1 A is bent, the metal wires 11 easily approach one another without interfering with one another at the inner side of the bent portion. If, for example, torque is applied along the axis of the wire rope 1 A by bending the wire rope 1 A, the metal wires 11 are less likely to come into contact with one another. This prevents heat generation due to friction between the metal wires 11 and prevents the metal wires 11 from being cut or suffering from other defects. Thus, the durability of the wire rope 1 A improves.
- the gaps between the metal wires 11 may include gaps of varying width.
- the metal wires 11 may include narrow gaps d 1 and wide gaps d 2 that differ in width.
- the wire rope 1 A if the wire rope 1 A is bent into various shapes, the metal wires 11 can be flexibly deformed in accordance with these shapes.
- the wire rope 1 A has a favorable flexibility and heat generation due to friction can be reliably prevented.
- Wire ropes 1 A according to the first embodiment and wire ropes 100 according to a related art were used for the test.
- the durability of the wire ropes was measured under the following conditions. As illustrated in FIG. 2B , the wire ropes were bent, with one end of each wire rope being connected to a motor, and the other end of the wire rope being connected to a brake. The motor was driven in order to consecutively apply torque along the axis of the wire rope.
- Tests were conducted under the following conditions: the diameters of bent portions R were set at 40 mm, 45 mm, and 50 mm; the rotational speed of the motor was 1800 (rpm); and the braking force was 20 (N ⁇ mm). The test was conducted until audible failure from the tested wire rope was heard, and the time at which audible failure was heard was recorded as the durability (sec).
- FIG. 2A shows the test results.
- the durability of both the wire rope 1 A according to the first embodiment and the wire rope 100 according to the related art both increased, as the diameter of the bent portion R of the tested wire rope became larger.
- the durability of the wire ropes 1 A according to the first embodiment was approximately 200%, at maximum, of the durability of the corresponding wire ropes 100 according to the related art. That is, the observed durability of the wire ropes 1 A according to the first embodiment was nearly double that of the wire ropes 100 according to the related art.
- the durability of the wire ropes 1 A according to the first embodiment exhibited superior durability results to those of the related art for at least the following reasons.
- the metal wires 11 of the wire ropes 1 A are less likely to rub against each other, therefore heat generation due to friction between the metal wires 11 is prevented, and thus the metal wires 11 are prevented from being cut.
- the gaps between the metal wires 11 need not be limited to any particular configuration.
- the wire rope 1 A may include gaps of uniform width between the metal wires 11 .
- the gaps between the metal wires 11 include the narrow gaps d 1 and the wide gaps d 2 that differ in width.
- the arrangement of successive narrow gaps d 1 and wide gaps d 2 may vary.
- the wire rope 1 A may have a portion in which multiple narrow gaps d 1 are successively formed and a portion in which multiple wide gaps d 2 are successively formed.
- the narrow gaps d 1 and the wide gaps d 2 may be alternately formed or may be formed at random.
- the narrow gap d 1 and the wide gap d 2 are formed alternately or at random.
- other gaps whose width differs from those of the narrow gaps d 1 and the wide gaps d 2 may be further provided between the metal wires 11 .
- a wire rope 1 B includes a multi-strand coil 10 and a multi-strand coil 20 that is disposed inside the multi-strand coil 10 .
- the multi-strand coil 10 disposed on the outer side is referred to as an outer multi-strand coil 10
- the multi-strand coil 20 disposed on the inner side is referred to as an inner multi-strand coil 20 .
- the outer multi-strand coil 10 is wound around the outer circumference of the inner multi-strand coil 20 .
- the multi-strand coils 10 and 20 are arranged such that the outer multi-strand coil 10 is wound in the same direction as the inner multi-strand coil 20 .
- a winding angle ⁇ , at which the outer multi-strand coil 10 is wound when viewed in vertical section, is made different from a winding angle ⁇ , at which the inner multi-strand coil 20 is wound when viewed in vertical section.
- the winding angle ⁇ is formed between the center line CL of the wire rope 1 B when viewed in vertical section and the center line of each metal wire 11 of the outer multi-strand coil 10
- the winding angle ⁇ is formed between the center line CL of the wire rope 1 B when viewed in vertical section and the center line of each metal wire 21 of the inner multi-strand coil 20 .
- winding the outer multi-strand coil 10 and the inner multi-strand coil 20 in the same direction negligibly distorts the multi-strand coils 10 and 20 when torque is applied to the wire rope 1 B.
- the entirety of the wire rope 1 B has a higher torque resistance.
- the multi-strand coils 10 and 20 are in point contact with one another since the winding angle ⁇ of the outer multi-strand coil 10 and the winding angle ⁇ of the inner multi-strand coil 20 are different from each other. Consequently, the metal wires 21 of the inner multi-strand coil 20 are prevented from entering the gaps between the metal wires 11 of the outer multi-strand coil 10 .
- the winding angle ⁇ of the outer multi-strand coil 10 is larger than the winding angle ⁇ of the inner multi-strand coil 20 .
- tension in the longitudinal direction of the metal wires 11 of the outer multi-strand coil 10 can be reduced. This can reduce fatigue of the metal wires 11 of the outer multi-strand coil 10 and the wire rope 1 B can therefore exhibit a higher durability.
- a wire rope 1 C according to the first modification includes an outer multi-strand coil 10 and an inner multi-strand coil 20 , which are wound in the same direction.
- the winding angle ⁇ of the outer multi-strand coil 10 when viewed in vertical section is smaller than the winding angle ⁇ of the inner multi-strand coil 20 when viewed in vertical section.
- the multi-strand coils 10 and 20 are less likely to be distorted and the entirety of the wire rope 1 C has a higher torque resistance.
- the metal wires 21 of the inner multi-strand coil 20 are prevented from entering the gaps between the metal wires 11 of the outer multi-strand coil 10 .
- a space s is provided between the inner circumference of an outer multi-strand coil 10 and the outer circumference of an inner multi-strand coil 20 .
- the wire rope 1 D having this configuration can be easily bent because metal wires 11 of the outer multi-strand coil 10 and metal wires 21 of the inner multi-strand coil 20 are less likely to interfere with one another. If torque is applied along the axis of the wire rope 1 D by bending the wire rope 1 D, heat generation due to friction is more reliably prevented. Thus, the wire rope 1 E can have a higher durability.
- gaps d 11 and d 12 between metal wires 11 of an outer multi-strand coil 10 are wider than gaps d 13 between metal wires 21 of an inner multi-strand coil 20 .
- the wire rope 1 E having this configuration is more easily bent. If torque is applied along the axis of the wire rope 1 E by bending the wire rope 1 E, heat generation due to friction can be more reliably prevented. Thus, the wire rope 1 E can have a higher durability.
- the gaps d 1 , d 2 , d 11 , and d 12 between the metal wires 11 may be provided at least at main portions of the wire ropes 1 A to 1 E, the main portions being deformable into curves in the longitudinal direction.
- the ranges for the diameter of the individual wires 11 may range from 0.25 mm to 0.30 mm.
- the diameter of the wire rope may range from 1.2 mm to about 1.5 mm.
- the gap d 1 may range from 0.5 mm to 0.15 mm.
- the gap d 2 may range from 0.15 to 0.25 mm.
- gaps d 1 and d 2 may have different dimensions, and may in fact have any range of dimensions, as long as d 1 and d 2 are randomly located in an axial direction of rope.
- the diameter of the inner wire rope may range from 0.6 mm to 1.0 mm, while the diameter of the individual inner wires 21 may range from 0.10 mm to 0.25 mm.
- the winding angles may vary.
- winding angle ⁇ may vary from 45° to 75°, while winding angle ⁇ may range from 45° to 75°.
- the diameter for the inner wire rope may range from 0.50 mm to 0.85 mm.
- the gaps d 11 , d 12 and d 13 may range from 0.12 mm to 0.15 mm; 0.15 mm to 0.25 mm; and 0.04 mm to 0.11 mm, respectively
- the wire ropes 1 A to 1 E are each preferably usable as a component of tools, such as an endoscopic surgical tool in which a driving core shaft is inserted into the outer multi-strand coil 10 and the inner multi-strand coil 20 , or as a component of an industrial component.
Abstract
A wire rope for use in a medical procedure includes a multi-strand coil formed by twisting multiple metal wires together. In the wire rope, gaps are located between the multiple metal wires along an axis of the multi-strand coil. The gaps between the multiple metal wires include a first gap and a second gap that differ in width.
Description
- This application claims priority to Japanese Patent Application No. 2011-279058 filed in the Japan Patent Office on Dec. 20, 2011, the entire contents of which are incorporated herein by reference.
- The disclosed embodiments relate to a medical device. More specifically, the disclosed embodiments relate to wire ropes. Wire ropes are multi-strand coils formed by twisting multiple wires together (see
FIG. 7 ). Japanese Unexamined Patent Application Publication No. 9-49517 discloses a structure of a flexible shaft including a core shaft. In this structure, wires are each helically wound around the core shaft while having minute gaps between turns of the wires, Japanese Unexamined Patent Application Publication No. 2001-280333 discloses a flexible shaft in which at least one of an outer-layer wire and an inner-layer wire is wound while having regular gaps between turns of the wire. Japanese Unexamined Patent Application Publication No. 7-14448 discloses a method of manufacturing a multilayer cable in which multiple core wires, serving as an inner layer, are twisted together in a direction that is opposite to the direction in which multiple core wires, serving as an outer layer, are twisted together. - However, the existing wire ropes, particularly the multi-strand coils, have the following drawbacks. When a force is applied to a wire rope in such a direction as to twist or untwist the wire rope around the axis while the wire rope is bent, the wires are heated by frictional heat due to the wires rubbing against each other or by heat due to plastic deformation. Thus, the wires may become deformed or cut.
- The flexible shaft disclosed in Japanese Unexamined Patent Application Publication No. 9-49517 has excellent flexibility since gaps are provided between turns of each wire. However, each of the layers of the flexible shaft is constituted by a single wire. Thus, when the flexible shaft is bent and is twisted around, heat is generated in the shaft and the wires may be cut as a result of the heat generated. Moreover, cutting the wires severely degrades the durability of the flexible shaft and the flexible shaft may be broken.
- In the flexible shaft disclosed in Japanese Unexamined Patent Application Publication No. 2001-280333, the wires are wound while having gaps between some adjacent turns of the wires in the longitudinal direction. However, the remaining part, other than the one wound with the gaps, is tightly wound. Since the tightly wound part of the wires of the flexible shaft suffers from heat generated therein, the durability of the whole flexible shaft is greatly reduced.
- In the cable disclosed in Japanese Unexamined Patent Application Publication No. 7-14448, the wires are each wound with no gaps between turns. Thus, the cable is more likely to experience increased heat, and therefore also exhibits reduced durability, as in the flexible shafts described in Japanese Unexamined Patent Application Publication Nos. 9-49517 and 2001-280333.
- Embodiments of the present invention are made in view of the above-discussed circumstances. Therefore, an object of the exemplary embodiments is to provide a wire rope that has excellent durability and excellent flexibility by reducing, or preventing wires from rubbing against each other to thereby suppress heat generation.
- In an aspect, a wire rope includes a multi-strand coil formed by twisting a plurality of metal wires together, and gaps are located between the plurality of metal wires along an axis of the multi-strand coil.
- By providing gaps between the metal wires in this manner, adjacent metal wires are less likely to interfere with one another and thus the wire rope bends easily. Moreover, if, for example, torque is applied along the axis of the wire rope by bending the wire rope, the metal wires are less likely to come into contact with one another and thus heat generation due to friction can be prevented. Consequently, the wire rope according to the disclosed embodiments of the present invention exhibits higher durability than the existing wire ropes.
- The wire rope according to the embodiments of the present invention has higher durability and excellent flexibility by gaps being provided between turns of each of metal wires to prevent heat generation due to friction between the metal wires when the wires are bent.
-
FIG. 1 schematically illustrates a wire rope according to a first embodiment when viewed in vertical section. -
FIG. 2A is a graph showing performance test results of both the wire rope according to the embodiments of the present invention and a related art wire rope. -
FIG. 2B is a schematic diagram of a configuration for the test depicted inFIG. 2A . -
FIG. 3 schematically illustrates a wire rope according to a second embodiment when viewed in vertical section. -
FIG. 4 schematically illustrates a wire rope according to a first modification of the second embodiment when viewed in vertical section. -
FIG. 5 schematically illustrates a wire rope according to a second modification of the second embodiment when viewed in vertical section. -
FIG. 6 schematically illustrates a wire rope according to a third modification of the second embodiment when viewed in vertical section. -
FIG. 7 schematically illustrates a related art wire rope when viewed in vertical section. - Wire ropes according to embodiments of the present invention will be described referring to the drawings.
- As illustrated in
FIG. 1 , awire rope 1A according to a first embodiment of the present invention includes amulti-strand coil 10 formed by twistingmultiple metal wires 11 together. The materials of themetal wires 11 are not limited to any particular type of material, so long as the materials exhibit high hardness. Accordingly, the materials of the metal wires may include, but are not limited to stainless steel wires, carbon steel wires, steel wires for springs, or any other metal exhibiting a hardness that is at least as high as the hardness of steel. - Gaps are located between the
metal wires 11 of themulti-strand coil 10 along the axis of themulti-strand coil 10. Accordingly, themetal wires 11 are arranged so that the metal wires do not contact one another (i.e., without touching each other). - For instance, in one embodiment, such as the one depicted in
FIG. 1 , the gaps between themetal wires 11 include gaps d1 and d2 that differ in width. Specifically, the gaps between themetal wires 11 include narrow gaps d1 and wide gaps d2, which are wider than the narrow gaps d1. - As described above, locating gaps between the
metal wires 11 improves the flexibility of thewire rope 1A. This is because, when thewire rope 1A is bent, themetal wires 11 easily approach one another without interfering with one another at the inner side of the bent portion. If, for example, torque is applied along the axis of thewire rope 1A by bending thewire rope 1A, themetal wires 11 are less likely to come into contact with one another. This prevents heat generation due to friction between themetal wires 11 and prevents themetal wires 11 from being cut or suffering from other defects. Thus, the durability of thewire rope 1A improves. - The gaps between the
metal wires 11 may include gaps of varying width. For instance, as shown inFIG. 1 , themetal wires 11 may include narrow gaps d1 and wide gaps d2 that differ in width. Thus, if thewire rope 1A is bent into various shapes, themetal wires 11 can be flexibly deformed in accordance with these shapes. Thus, thewire rope 1A has a favorable flexibility and heat generation due to friction can be reliably prevented. - Referring now to
FIGS. 2A and 2B , a durability test for wire ropes and the results of the test will be described.Wire ropes 1A according to the first embodiment andwire ropes 100 according to a related art (seeFIG. 7 ) were used for the test. In the test, the durability of the wire ropes was measured under the following conditions. As illustrated inFIG. 2B , the wire ropes were bent, with one end of each wire rope being connected to a motor, and the other end of the wire rope being connected to a brake. The motor was driven in order to consecutively apply torque along the axis of the wire rope. Tests were conducted under the following conditions: the diameters of bent portions R were set at 40 mm, 45 mm, and 50 mm; the rotational speed of the motor was 1800 (rpm); and the braking force was 20 (N·mm). The test was conducted until audible failure from the tested wire rope was heard, and the time at which audible failure was heard was recorded as the durability (sec). -
FIG. 2A shows the test results. The durability of both thewire rope 1A according to the first embodiment and thewire rope 100 according to the related art both increased, as the diameter of the bent portion R of the tested wire rope became larger. However, the durability of thewire ropes 1A according to the first embodiment was approximately 200%, at maximum, of the durability of thecorresponding wire ropes 100 according to the related art. That is, the observed durability of thewire ropes 1A according to the first embodiment was nearly double that of thewire ropes 100 according to the related art. The durability of thewire ropes 1A according to the first embodiment exhibited superior durability results to those of the related art for at least the following reasons. Themetal wires 11 of thewire ropes 1A are less likely to rub against each other, therefore heat generation due to friction between themetal wires 11 is prevented, and thus themetal wires 11 are prevented from being cut. - The gaps between the
metal wires 11 need not be limited to any particular configuration. For instance, in alternate embodiments thewire rope 1A may include gaps of uniform width between themetal wires 11. However, in order for themetal wires 11 to be flexibly deformable in accordance with various shapes into which thewire rope 1A is bent, it is preferable that the gaps between themetal wires 11 include the narrow gaps d1 and the wide gaps d2 that differ in width. - The arrangement of successive narrow gaps d1 and wide gaps d2 may vary. For instance, as illustrated in
FIG. 1 , thewire rope 1A may have a portion in which multiple narrow gaps d1 are successively formed and a portion in which multiple wide gaps d2 are successively formed. However, in other embodiments, the narrow gaps d1 and the wide gaps d2 may be alternately formed or may be formed at random. - From the view point of flexibility of the
metal wires 11 with which themetal wires 11 are deformable in accordance with various shapes into which thewire rope 1A is bent, it is preferable that the narrow gap d1 and the wide gap d2 are formed alternately or at random. In the first embodiment, other gaps whose width differs from those of the narrow gaps d1 and the wide gaps d2 may be further provided between themetal wires 11. - Referring to
FIG. 3 , a second embodiment will be described now. Portions that are the same as those in the first embodiment will not be described and the same portions are denoted by the same reference numerals. - As illustrated in
FIG. 3 , awire rope 1B according to a second embodiment of the present invention includes amulti-strand coil 10 and amulti-strand coil 20 that is disposed inside themulti-strand coil 10. Hereinbelow, themulti-strand coil 10 disposed on the outer side is referred to as an outermulti-strand coil 10, and themulti-strand coil 20 disposed on the inner side is referred to as an innermulti-strand coil 20. - The outer
multi-strand coil 10 is wound around the outer circumference of the innermulti-strand coil 20. The multi-strand coils 10 and 20 are arranged such that the outermulti-strand coil 10 is wound in the same direction as the innermulti-strand coil 20. A winding angle α, at which the outermulti-strand coil 10 is wound when viewed in vertical section, is made different from a winding angle β, at which the innermulti-strand coil 20 is wound when viewed in vertical section. Specifically, the winding angle α is formed between the center line CL of thewire rope 1B when viewed in vertical section and the center line of eachmetal wire 11 of the outermulti-strand coil 10, and the winding angle β is formed between the center line CL of thewire rope 1B when viewed in vertical section and the center line of eachmetal wire 21 of the innermulti-strand coil 20. - As described above, winding the outer
multi-strand coil 10 and the innermulti-strand coil 20 in the same direction negligibly distorts the multi-strand coils 10 and 20 when torque is applied to thewire rope 1B. Thus, the entirety of thewire rope 1B has a higher torque resistance. In addition, the multi-strand coils 10 and 20 are in point contact with one another since the winding angle α of the outermulti-strand coil 10 and the winding angle β of the innermulti-strand coil 20 are different from each other. Consequently, themetal wires 21 of the innermulti-strand coil 20 are prevented from entering the gaps between themetal wires 11 of the outermulti-strand coil 10. In this embodiment, the winding angle α of the outermulti-strand coil 10 is larger than the winding angle β of the innermulti-strand coil 20. Thus, tension in the longitudinal direction of themetal wires 11 of the outermulti-strand coil 10 can be reduced. This can reduce fatigue of themetal wires 11 of the outermulti-strand coil 10 and thewire rope 1B can therefore exhibit a higher durability. - A first modification of the second embodiment will be described now.
- As illustrated in
FIG. 4 , a wire rope 1C according to the first modification includes an outermulti-strand coil 10 and an innermulti-strand coil 20, which are wound in the same direction. The winding angle α of the outermulti-strand coil 10 when viewed in vertical section is smaller than the winding angle β of the innermulti-strand coil 20 when viewed in vertical section. - If torque is applied to the wire rope 1C having the above-described configuration, the multi-strand coils 10 and 20 are less likely to be distorted and the entirety of the wire rope 1C has a higher torque resistance. In addition, since the multi-strand coils 10 and 20 are in point contact with one another, the
metal wires 21 of the innermulti-strand coil 20 are prevented from entering the gaps between themetal wires 11 of the outermulti-strand coil 10. - A second modification of the second embodiment will be described now.
- As illustrated in
FIG. 5 , in awire rope 1D according to the second modification, a space s is provided between the inner circumference of an outermulti-strand coil 10 and the outer circumference of an innermulti-strand coil 20. - The
wire rope 1D having this configuration can be easily bent becausemetal wires 11 of the outermulti-strand coil 10 andmetal wires 21 of the innermulti-strand coil 20 are less likely to interfere with one another. If torque is applied along the axis of thewire rope 1D by bending thewire rope 1D, heat generation due to friction is more reliably prevented. Thus, thewire rope 1E can have a higher durability. - A third modification of the second embodiment will be described now.
- As illustrated in
FIG. 6 , in awire rope 1E according to the third modification, gaps d11 and d12 betweenmetal wires 11 of an outermulti-strand coil 10 are wider than gaps d13 betweenmetal wires 21 of an innermulti-strand coil 20. - The
wire rope 1E having this configuration is more easily bent. If torque is applied along the axis of thewire rope 1E by bending thewire rope 1E, heat generation due to friction can be more reliably prevented. Thus, thewire rope 1E can have a higher durability. - The embodiments of the present invention are not limited to the above-described embodiments and the embodiments may be modified or combined as appropriate within a scope not departing from the gist of the invention.
- The gaps d1, d2, d11, and d12 between the
metal wires 11 may be provided at least at main portions of thewire ropes 1A to 1E, the main portions being deformable into curves in the longitudinal direction. - The ranges for the diameter of the
individual wires 11 may range from 0.25 mm to 0.30 mm. The diameter of the wire rope may range from 1.2 mm to about 1.5 mm. The gap d1 may range from 0.5 mm to 0.15 mm. The gap d2 may range from 0.15 to 0.25 mm. As such, gaps d1 and d2 may have different dimensions, and may in fact have any range of dimensions, as long as d1 and d2 are randomly located in an axial direction of rope. The diameter of the inner wire rope may range from 0.6 mm to 1.0 mm, while the diameter of the individualinner wires 21 may range from 0.10 mm to 0.25 mm. The winding angles may vary. For instance, winding angle α may vary from 45° to 75°, while winding angle β may range from 45° to 75°. The diameter for the inner wire rope may range from 0.50 mm to 0.85 mm. The gaps d11, d12 and d13 may range from 0.12 mm to 0.15 mm; 0.15 mm to 0.25 mm; and 0.04 mm to 0.11 mm, respectively - The
wire ropes 1A to 1E are each preferably usable as a component of tools, such as an endoscopic surgical tool in which a driving core shaft is inserted into the outermulti-strand coil 10 and the innermulti-strand coil 20, or as a component of an industrial component.
Claims (6)
1. A wire rope for use in a medical procedure, the wire rope comprising:
a first multi-strand coil including a plurality of metal wires, wherein
the first multi-strand coil has gaps between the plurality of metal wires along an axis of the first multi-strand coil.
2. The wire rope according to claim 1 , wherein the gaps between the plurality of metal wires include a first gap and a second gap that differ in width.
3. The wire rope according to claim 1 , further comprising:
a second multi-strand coil,
wherein the second multi-strand coil is disposed inside the first multi-strand coil such that the first multi-strand coil on an outer side is wound around an outer circumference of the second multi-strand coil on an inner side, and
wherein the first multi-strand coil on the outer side is wound in the same direction as the second multi-strand coil on the inner side, and an angle at which the first multi-strand coil on the outer side is wound when viewed in vertical section differs from an angle at which the second multi-strand coil on the inner side is wound when viewed in vertical section.
4. The wire rope according to claim 2 , further comprising:
a second multi-strand coil,
wherein the second multi-strand coil is disposed inside the first multi-strand coil such that the first multi-strand coil on an outer side is wound around an outer circumference of the second multi-strand coil on an inner side, and
wherein the first multi-strand coil on the outer side is wound in the same direction as the second multi-strand coil on the inner side, and an angle at which the first multi-strand coil on the outer side is wound when viewed in vertical section differs from an angle at which the second multi-strand coil on the inner side is wound when viewed in vertical section.
5. The wire rope according to claim 3 , wherein the angle at which the first multi-strand coil on the outer side is wound when viewed in vertical section is larger than the angle at which the second multi-strand coil on the inner side is wound when viewed in vertical section.
6. The wire rope according to claim 4 , wherein the angle at which the first multi-strand coil on the outer side is wound when viewed in vertical section is larger than the angle at which the second multi-strand coil on the inner side is wound when viewed in vertical section.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011-279058 | 2011-12-20 | ||
JP2011279058A JP2013130223A (en) | 2011-12-20 | 2011-12-20 | Wire rope |
Publications (1)
Publication Number | Publication Date |
---|---|
US20130152541A1 true US20130152541A1 (en) | 2013-06-20 |
Family
ID=47602870
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/722,234 Abandoned US20130152541A1 (en) | 2011-12-20 | 2012-12-20 | Wire rope |
Country Status (4)
Country | Link |
---|---|
US (1) | US20130152541A1 (en) |
EP (1) | EP2607724A1 (en) |
JP (1) | JP2013130223A (en) |
CN (1) | CN103174042A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20190086369A1 (en) * | 2016-04-22 | 2019-03-21 | Mitsubishi Electric Corporation | Rope damage diagnostic testing apparatus |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3065805A1 (en) | 2013-11-04 | 2016-09-14 | Nitiloop Ltd. | Microcatheter tubing arrangement |
Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3749086A (en) * | 1972-07-24 | 1973-07-31 | Medical Evaluation Devices & I | Spring guide with flexible distal tip |
US4899787A (en) * | 1981-11-17 | 1990-02-13 | Kabushiki Kaisha Medos Kenkyusho | Flexible tube for endoscope |
US5002041A (en) * | 1989-05-12 | 1991-03-26 | Kabushiki Kaisha Machida Seisakusho | Bending device and flexible tube structure |
US5203380A (en) * | 1989-10-13 | 1993-04-20 | Kabushiki Kaisha Machida Seisakusho | Bending device |
US5378234A (en) * | 1993-03-15 | 1995-01-03 | Pilot Cardiovascular Systems, Inc. | Coil polymer composite |
US5480382A (en) * | 1989-01-09 | 1996-01-02 | Pilot Cardiovascular Systems, Inc. | Steerable medical device |
US5746696A (en) * | 1995-05-16 | 1998-05-05 | Fuji Photo Optical Co., Ltd. | Flexible sheathing tube construction |
US5873866A (en) * | 1995-01-13 | 1999-02-23 | Fuji Photo Optical Co., Ltd. | Flexible sheathing tube construction, and method for fabrication thereof |
US5891114A (en) * | 1997-09-30 | 1999-04-06 | Target Therapeutics, Inc. | Soft-tip high performance braided catheter |
US6132388A (en) * | 1997-10-16 | 2000-10-17 | Scimed Life Systems, Inc. | Guide wire tip |
US7381198B2 (en) * | 2000-08-23 | 2008-06-03 | Revascular Therapeutics, Inc. | Steerable distal support system |
US7833218B2 (en) * | 2007-04-17 | 2010-11-16 | Medtronic Vascular, Inc. | Catheter with reinforcing layer having variable strand construction |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2892624A (en) * | 1957-03-21 | 1959-06-30 | American Steel Foundries | Axial load spring |
JPS62170594A (en) * | 1986-01-17 | 1987-07-27 | 東京製綱株式会社 | Steel cord for reinforcing rubber |
JP2827009B2 (en) * | 1988-02-06 | 1998-11-18 | 日本発条株式会社 | Spring device |
JPH0672369B2 (en) * | 1989-02-25 | 1994-09-14 | 住友ゴム工業株式会社 | Steel cord |
JPH0768673B2 (en) * | 1991-12-27 | 1995-07-26 | トクセン工業株式会社 | Steel cord for reinforcing rubber products |
JPH0714448A (en) | 1993-06-25 | 1995-01-17 | Hitachi Cable Ltd | Manufacture of layer type cable and device therefor |
GB9403675D0 (en) * | 1994-02-25 | 1994-04-13 | Asw Ltd | High tensile strand anchorages and methods of installation thereof |
JP3455352B2 (en) * | 1994-12-26 | 2003-10-14 | 株式会社ブリヂストン | Steel cord for rubber reinforcement and radial tire using the same |
JP3109415B2 (en) | 1995-08-07 | 2000-11-13 | トヨタ自動車株式会社 | Flexible shaft structure |
JP3650530B2 (en) * | 1998-08-18 | 2005-05-18 | 三菱電線工業株式会社 | Torque transmission tube and endoscope |
JP2001280333A (en) | 2000-03-31 | 2001-10-10 | Fuji Photo Optical Co Ltd | Flexible shaft |
JP4204318B2 (en) * | 2000-12-27 | 2009-01-07 | ピレリ・タイヤ・ソチエタ・ペル・アツィオーニ | Reinforced tire |
-
2011
- 2011-12-20 JP JP2011279058A patent/JP2013130223A/en active Pending
-
2012
- 2012-12-04 CN CN2012105115106A patent/CN103174042A/en active Pending
- 2012-12-10 EP EP12196216.1A patent/EP2607724A1/en not_active Withdrawn
- 2012-12-20 US US13/722,234 patent/US20130152541A1/en not_active Abandoned
Patent Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3749086A (en) * | 1972-07-24 | 1973-07-31 | Medical Evaluation Devices & I | Spring guide with flexible distal tip |
US4899787A (en) * | 1981-11-17 | 1990-02-13 | Kabushiki Kaisha Medos Kenkyusho | Flexible tube for endoscope |
US5480382A (en) * | 1989-01-09 | 1996-01-02 | Pilot Cardiovascular Systems, Inc. | Steerable medical device |
US5002041A (en) * | 1989-05-12 | 1991-03-26 | Kabushiki Kaisha Machida Seisakusho | Bending device and flexible tube structure |
US5203380A (en) * | 1989-10-13 | 1993-04-20 | Kabushiki Kaisha Machida Seisakusho | Bending device |
US5378234A (en) * | 1993-03-15 | 1995-01-03 | Pilot Cardiovascular Systems, Inc. | Coil polymer composite |
US5873866A (en) * | 1995-01-13 | 1999-02-23 | Fuji Photo Optical Co., Ltd. | Flexible sheathing tube construction, and method for fabrication thereof |
US5746696A (en) * | 1995-05-16 | 1998-05-05 | Fuji Photo Optical Co., Ltd. | Flexible sheathing tube construction |
US5891114A (en) * | 1997-09-30 | 1999-04-06 | Target Therapeutics, Inc. | Soft-tip high performance braided catheter |
US6165163A (en) * | 1997-09-30 | 2000-12-26 | Target Therapeutics, Inc. | Soft-tip performance braided catheter |
US6132388A (en) * | 1997-10-16 | 2000-10-17 | Scimed Life Systems, Inc. | Guide wire tip |
US7381198B2 (en) * | 2000-08-23 | 2008-06-03 | Revascular Therapeutics, Inc. | Steerable distal support system |
US7833218B2 (en) * | 2007-04-17 | 2010-11-16 | Medtronic Vascular, Inc. | Catheter with reinforcing layer having variable strand construction |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20190086369A1 (en) * | 2016-04-22 | 2019-03-21 | Mitsubishi Electric Corporation | Rope damage diagnostic testing apparatus |
US10801999B2 (en) * | 2016-04-22 | 2020-10-13 | Mitsubishi Electric Corporation | Rope damage diagnostic testing apparatus |
Also Published As
Publication number | Publication date |
---|---|
EP2607724A1 (en) | 2013-06-26 |
CN103174042A (en) | 2013-06-26 |
JP2013130223A (en) | 2013-07-04 |
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