CA1098421A - Method for terminating flexible helical wire conduit - Google Patents
Method for terminating flexible helical wire conduitInfo
- Publication number
- CA1098421A CA1098421A CA295,382A CA295382A CA1098421A CA 1098421 A CA1098421 A CA 1098421A CA 295382 A CA295382 A CA 295382A CA 1098421 A CA1098421 A CA 1098421A
- Authority
- CA
- Canada
- Prior art keywords
- conduit
- termination member
- integral extension
- termination
- cut
- 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.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14598—Coating tubular articles
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B9/00—Binding or sealing ends, e.g. to prevent unravelling
-
- 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
- F16C1/26—Construction of guiding-sheathings or guiding-tubes
- F16C1/262—End fittings; Attachment thereof to the sheathing or tube
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Flexible Shafts (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Media Introduction/Drainage Providing Device (AREA)
Abstract
Abstract of the Disclosure There is disclosed a method of forming a unit comprising a conduit formed from spirally wound wire, or from two or more layers of which the outer is formed from spirally wound wire. A termination member is fixed around an end portion of the conduit and holds the parts of the spirally wound wire that lie between the ends of the termination member in position relatively to each other. According to the method the end portion and an extension of the conduit to which the end portion is integrally connected is held within a mould, thermoplastic material is injected into the mould to form the termination member, and after the thermoplastic material has set, a cut is made to separate the conduit from the integral extension. There is also disclosed a unit comprising a conduit formed as defined above.
Description
~098421 Cables s~ch as are widely used in tha actuation o~ automotive parkin~ brakes and clutches, and have other applications in industrial, marine and aircra~t contexts, com~only hæve a central core that can reciprocate axially within a conGuit. T~e conduit may be iormed from spirally wound wire, or spirally wound wire may form the outer oi ~everal concentric layers. If such a conduit is cut ~rom a continuous len3th, then there ~s the risk that the wire wlll become unwound in the region oi the cut. This, in itsel~, c&n be unsatisfactory but if it is then necessar~ to provide that conduit with a termination member, ~here is the additional problem of capturing the "frayed" wire or wires within the termination member. The present invention arose ~rom a consideration oi this problem.
According to the present invention, thera is provided a method o~ ~ormin~ z unit comprisin~ a conduit iormed $rom spirally wound wire, or ~rom two or more
According to the present invention, thera is provided a method o~ ~ormin~ z unit comprisin~ a conduit iormed $rom spirally wound wire, or ~rom two or more
2~ layer~ oi which the outer is ~ormed ~rom spirally wound wire, and atermination member ~ixed around an end portion oi the conduit and holdine the parts o~ the splrally wound wire that lie between the ends o~ the termlnation lOq84Zl member in position relatively to each other, in which method the end portion, and an extension of the conduit to which the and portion is inte~rally connected is held within a mould, thermoplastic material is injected into the mould to form the termination member, and, after the thermoplstic materiæl has set,a cut is made to separate the condult ~rom the integral extension.
Thus, the parts oi the wire are held in position by the termination mer.~ber without the provision of additional maans ~or the purposa.
The mouldin~ operation may form only a sin1e termination me~ber, but it may be arran~ed that two are ~ormed simultaneously by the single moulding operation, and the two are then separated by the cut that separatas the conduit ~rom its extension, the extension being included with the second termination member in another unit.
10~84Zl The spirally wound wire may provide widely spaced convolutions overlying another layer of more closely spaced convolutions, and the termination may serve to hold turns o~ both layers in position relat~e~y to each other. By the moulding process, the thermoplastic material may be forced closely into the spaces between adjacent convolutions, and so provide a seal between 10. them.
The termination member may have a length and flexibi~ity that serve to dis-tribute vibration and bending stresses; in particular, it may be so de8igned that when it is intended to mate within another ~itting, the stresses are not concentrated at the entry point to the iittln~.
. . ~
iO9842~
By way of example, an embodiment of the present invention will now be described with reference to the accompanying drawin~s in which:
Figures lA and lB are side and end views of a unit comprising a conduit and a termination member fixed around ~ end portion of the conduit;
Figure 2 is a schematic view in axial section of moulding apparatus by which the ~he termination member may be ~ormed; and Fi~ure 3 is a view in side elevation o~ the product that is yielded by the mouldin~ apparatus illustrated in Figure 2 The unit illustrated in ~igures lA and lB includes a helical wire ~lexibl~ conduit, of which a part is indicated at 1~, and a cylindrical plastic termination member 11 moulded on to the end portion of the conduit lO.
The conduit 10 comprises an inner,helically wound, core 12 of flat wire, an intermediate layer 13 of helically wound conti~uous wires coiled with a relatively long pitch, and an outer layer 14 of helically wound turn~
which act to retain the wires o~ the itermediate layer 13 in position. The conduit 10 may act as the sleeve through which runs an inner element by which tensile compressive forces may be transmitted to a location remote ~rom an operator. The conduit and inner element thus form a cable such as is commonly used in the actuation o~ automa~ic parking brakes and clutches.
The moulded plastic termination member 11 has ~
cylindrical outer sur~ace and an internal surface which intimately conforms to the exposed sur~ace of the part of conduit 19that lies between the ends of the termination member 11. The plastic not only circumscribes, and holds in position relatively to each other,the widely spaced turns of the outer layer 14 but also penetrates into the interstices between adjacent turns o~ intermediate helix 13. This not only positions the turns of helix 13 but pro-vides enhanced resistance to the passage o~ water or other corrosive liqulds between the ends of the turns. Conduit 10 may be composed of galvanized steel w~re, and member 11 can be moulded from such flexible thermopla~tic materials as nylon, acetal resin, or polyathylene.
The length of termination member 11 is more than twice its diameter and is such thæt the member will extend about a quarter of an inch beyond the end of a ~itting into which it is to be inserted to act as a connection for the conduit. Such A ~ en~t~ t~nds to dis-tribute vibration stresses along the part o~ the con-dult that is covered by the termination member and thereby relieve the concentration o~ stresses at the exit end o~ the member.
~98421 The unit that has been described is farmed by use o~ the mould~n$ apparatus that is shown in Fi~ure ~, which provides a die 20, by ~bich a pair o~ cylindric~l plastic termination members may be moulded simultaneously one on the end o~ one conduit an~ the other on the adjacent end o~ another condult that, initially, ~orms an integral extension o f the ~irst conduit. The die comprises two matin~ halves 21 and 22 definin~; a cylind-rical cavity 23A, 23B, and 23C. The termination member on the end of one conduit is $ormed within 23A and part o~ 23B whilst th~ termination member on the other con-duit is ~ormed within 23C and part of 23B, a cut beiDg made throu~h the part 23B to separate the termination members ~rom each other. The ends 24 and 25 o~ the die are open to permit the two i~te~ral conduits to extend through the mould, and, when the conduits are in position, the ends of the cavity are closed by sealing collars 27. One of the halves ~1 contains an ~ ~8 ~ aperture ~ through which fluid thermoplastlc material may be injected into the cavity. A particular suitable material is a nylon copolymer that may be moulded at a temperature o~ 460-500 F. and at a mnximum pressure of about 215 pounds per square inch. In~ection time ~or such material is about three seconds, and cycle time is about ten seconds.
To use the apparatus 2Q the halves 21 and 22 are separated ~nd the two inte~rally~connec~ed. c03du~ts a~e brou~ht into position, with the sealin~ collars 27 lying at the ends of the mould. The mould is then closed arou~d the eondu~s with the resilient end members simultaneously sealin~ the ends and servin~ to centre the ends o~ the conduits A conventional injeetion head (not shown) is inserted into apertures 2~, and ~luid plastic is injected into the cavity 23A, 23B, 23C into intimate contact with the exposed surface of the outer and intermediate lay~rs la and 13 and with the surfaces o~ the cylindrical cævities ~3A, 23B and 23C. After the plastie has cooled from the ~luid state, the halves of the die are separated and the con~uits,still integrally connected to each other, with the mouldin~ formed around them are removed~ A cut is then made through the mould-ing to sepærate the eonduits from each other to result in two units eaeh eomprising ~ eonduit having a ter~.ihatioh merAher fixed around its end portion.
The immediate product of the mouldin~ operation is illustrated in Figure 3 which ~ows the struetura 30 moulded around the end portion o~ the eon~ui~ 10 that are still integrally connected to eaeh other. The strueture 30 i~elud~scyli~drical portions 31A, 31B, and 31C corr~sponding to the parts 23A, 23B and 23C o~ the 10~8~2:1 cavity of the mould die ~0. rr`.lis structure is conveniently cut into two æt thc~ reduced diame-ter portion 31~ using a cut-off wheel, leævin~ t~o conduit ends terminæted by termination men.bers llA and llC, as shown in ~i~ure 1.
Since the cut is mæde through a section o~ reduc~d dir~eter, the bar res~ iin& ~rom the abrasive cut-off is small.
It will be noticed that durin~ and throughout the mouldin~ operation, the two conduits are integrally connected together so that one ~orms an inte~ral extension o~ the other. ~hus, each is e~fecti~e to hold the strands o~ the other in their desired relative position. ~he conduits are not separ&ted from each other until the mouldin~ has set and becomes effective to hold the turns in position relatively to each other.
II1 the embodiment described, each terminatin~ member is effective to hold in position not onl-y the turn of the outer læyel lg- but also the turn of the next inner layer 13.
In typic~l use o~ a unit ~ormed as described, the termination mem~er is inserterl into a fitting, such as a screw machine or stamped bushin~ which is crimped down 84Zl onto the ~rmination member. The crirmp~in~ operation further enhances the liquid seal by forcefully biasin~ the resilient plastic material into intimate contact with the wires of intermediat~ helix 13.
Thus, the parts oi the wire are held in position by the termination mer.~ber without the provision of additional maans ~or the purposa.
The mouldin~ operation may form only a sin1e termination me~ber, but it may be arran~ed that two are ~ormed simultaneously by the single moulding operation, and the two are then separated by the cut that separatas the conduit ~rom its extension, the extension being included with the second termination member in another unit.
10~84Zl The spirally wound wire may provide widely spaced convolutions overlying another layer of more closely spaced convolutions, and the termination may serve to hold turns o~ both layers in position relat~e~y to each other. By the moulding process, the thermoplastic material may be forced closely into the spaces between adjacent convolutions, and so provide a seal between 10. them.
The termination member may have a length and flexibi~ity that serve to dis-tribute vibration and bending stresses; in particular, it may be so de8igned that when it is intended to mate within another ~itting, the stresses are not concentrated at the entry point to the iittln~.
. . ~
iO9842~
By way of example, an embodiment of the present invention will now be described with reference to the accompanying drawin~s in which:
Figures lA and lB are side and end views of a unit comprising a conduit and a termination member fixed around ~ end portion of the conduit;
Figure 2 is a schematic view in axial section of moulding apparatus by which the ~he termination member may be ~ormed; and Fi~ure 3 is a view in side elevation o~ the product that is yielded by the mouldin~ apparatus illustrated in Figure 2 The unit illustrated in ~igures lA and lB includes a helical wire ~lexibl~ conduit, of which a part is indicated at 1~, and a cylindrical plastic termination member 11 moulded on to the end portion of the conduit lO.
The conduit 10 comprises an inner,helically wound, core 12 of flat wire, an intermediate layer 13 of helically wound conti~uous wires coiled with a relatively long pitch, and an outer layer 14 of helically wound turn~
which act to retain the wires o~ the itermediate layer 13 in position. The conduit 10 may act as the sleeve through which runs an inner element by which tensile compressive forces may be transmitted to a location remote ~rom an operator. The conduit and inner element thus form a cable such as is commonly used in the actuation o~ automa~ic parking brakes and clutches.
The moulded plastic termination member 11 has ~
cylindrical outer sur~ace and an internal surface which intimately conforms to the exposed sur~ace of the part of conduit 19that lies between the ends of the termination member 11. The plastic not only circumscribes, and holds in position relatively to each other,the widely spaced turns of the outer layer 14 but also penetrates into the interstices between adjacent turns o~ intermediate helix 13. This not only positions the turns of helix 13 but pro-vides enhanced resistance to the passage o~ water or other corrosive liqulds between the ends of the turns. Conduit 10 may be composed of galvanized steel w~re, and member 11 can be moulded from such flexible thermopla~tic materials as nylon, acetal resin, or polyathylene.
The length of termination member 11 is more than twice its diameter and is such thæt the member will extend about a quarter of an inch beyond the end of a ~itting into which it is to be inserted to act as a connection for the conduit. Such A ~ en~t~ t~nds to dis-tribute vibration stresses along the part o~ the con-dult that is covered by the termination member and thereby relieve the concentration o~ stresses at the exit end o~ the member.
~98421 The unit that has been described is farmed by use o~ the mould~n$ apparatus that is shown in Fi~ure ~, which provides a die 20, by ~bich a pair o~ cylindric~l plastic termination members may be moulded simultaneously one on the end o~ one conduit an~ the other on the adjacent end o~ another condult that, initially, ~orms an integral extension o f the ~irst conduit. The die comprises two matin~ halves 21 and 22 definin~; a cylind-rical cavity 23A, 23B, and 23C. The termination member on the end of one conduit is $ormed within 23A and part o~ 23B whilst th~ termination member on the other con-duit is ~ormed within 23C and part of 23B, a cut beiDg made throu~h the part 23B to separate the termination members ~rom each other. The ends 24 and 25 o~ the die are open to permit the two i~te~ral conduits to extend through the mould, and, when the conduits are in position, the ends of the cavity are closed by sealing collars 27. One of the halves ~1 contains an ~ ~8 ~ aperture ~ through which fluid thermoplastlc material may be injected into the cavity. A particular suitable material is a nylon copolymer that may be moulded at a temperature o~ 460-500 F. and at a mnximum pressure of about 215 pounds per square inch. In~ection time ~or such material is about three seconds, and cycle time is about ten seconds.
To use the apparatus 2Q the halves 21 and 22 are separated ~nd the two inte~rally~connec~ed. c03du~ts a~e brou~ht into position, with the sealin~ collars 27 lying at the ends of the mould. The mould is then closed arou~d the eondu~s with the resilient end members simultaneously sealin~ the ends and servin~ to centre the ends o~ the conduits A conventional injeetion head (not shown) is inserted into apertures 2~, and ~luid plastic is injected into the cavity 23A, 23B, 23C into intimate contact with the exposed surface of the outer and intermediate lay~rs la and 13 and with the surfaces o~ the cylindrical cævities ~3A, 23B and 23C. After the plastie has cooled from the ~luid state, the halves of the die are separated and the con~uits,still integrally connected to each other, with the mouldin~ formed around them are removed~ A cut is then made through the mould-ing to sepærate the eonduits from each other to result in two units eaeh eomprising ~ eonduit having a ter~.ihatioh merAher fixed around its end portion.
The immediate product of the mouldin~ operation is illustrated in Figure 3 which ~ows the struetura 30 moulded around the end portion o~ the eon~ui~ 10 that are still integrally connected to eaeh other. The strueture 30 i~elud~scyli~drical portions 31A, 31B, and 31C corr~sponding to the parts 23A, 23B and 23C o~ the 10~8~2:1 cavity of the mould die ~0. rr`.lis structure is conveniently cut into two æt thc~ reduced diame-ter portion 31~ using a cut-off wheel, leævin~ t~o conduit ends terminæted by termination men.bers llA and llC, as shown in ~i~ure 1.
Since the cut is mæde through a section o~ reduc~d dir~eter, the bar res~ iin& ~rom the abrasive cut-off is small.
It will be noticed that durin~ and throughout the mouldin~ operation, the two conduits are integrally connected together so that one ~orms an inte~ral extension o~ the other. ~hus, each is e~fecti~e to hold the strands o~ the other in their desired relative position. ~he conduits are not separ&ted from each other until the mouldin~ has set and becomes effective to hold the turns in position relatively to each other.
II1 the embodiment described, each terminatin~ member is effective to hold in position not onl-y the turn of the outer læyel lg- but also the turn of the next inner layer 13.
In typic~l use o~ a unit ~ormed as described, the termination mem~er is inserterl into a fitting, such as a screw machine or stamped bushin~ which is crimped down 84Zl onto the ~rmination member. The crirmp~in~ operation further enhances the liquid seal by forcefully biasin~ the resilient plastic material into intimate contact with the wires of intermediat~ helix 13.
Claims (5)
1. A method of forming a unit comprising a conduit formed from spirally wound wire, or from two or more layers of which the outer is formed from spirally wound wire, and a termination member fixed around an end portion of the con-duit and holding the parts of the spirally wound wire that lie between the ends of the termination member in position relatively to each other, in which method the end portion, and an extension of the conduit to which the end portion is integrally connected, is held within a mould, thermo-plastic material is injected into the mould to form the termination member, and, after the thermoplastic material has set, a cut is made to separate the conduit from the integral extension.
2. A method as claimed in Claim 1 in which, simultaneously with the formation of the termination member, there is formed an integral extension of the termination member that embraces the integral extension of the conduit, and the cut that separates the conduit from its integral extension also separates the termination member from its integral extension.
3. A method as claimed in Claim 1 in which, simultaneously with the formation of the termination member, there is formed an integral extension of the termination member that embraces the integral extension of the conduit, and the cut that separates the conduit from its integral extension, also separates the termination from its integral extension, the integral extension of the termination member forming another termination member, and the integral extension of -the con-duit forming another conduit that.with the other termination member, constitutes another unit as defined in Claim 1.
4. A method as claimed in either of claims 2 and 3 in which, immediately on each side of the cut, the thermo-plastic material has a diameter less than that over the major part of its length.
5. A method as claimed in any of claims 1, 2 and 3, in which the wire forms an outer layer, the convolutions of the outer layer are widely spaced, the layer on which that layer is wound is formed from wire wound in closely spaced convolutions, and the or each termination member holds in position the parts of the spirally wound wire of both layers that lie between the ends of the termination member.
6, A method as claimed in any of claims 1, 2 and 3 in which the, or each, termination member has a maximum diameter that is less than half its length.
7. A unit comprising a conduit and a termination member
5. A method as claimed in any of claims 1, 2 and 3, in which the wire forms an outer layer, the convolutions of the outer layer are widely spaced, the layer on which that layer is wound is formed from wire wound in closely spaced convolutions, and the or each termination member holds in position the parts of the spirally wound wire of both layers that lie between the ends of the termination member.
6, A method as claimed in any of claims 1, 2 and 3 in which the, or each, termination member has a maximum diameter that is less than half its length.
7. A unit comprising a conduit and a termination member
5. produced by a method as claimed in any of claims 1, 2 and 3
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US76121577A | 1977-01-21 | 1977-01-21 | |
| US761,215 | 1985-07-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1098421A true CA1098421A (en) | 1981-03-31 |
Family
ID=25061529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA295,382A Expired CA1098421A (en) | 1977-01-21 | 1978-01-20 | Method for terminating flexible helical wire conduit |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS53108157A (en) |
| BR (1) | BR7800351A (en) |
| CA (1) | CA1098421A (en) |
| DE (1) | DE2802127A1 (en) |
| ES (1) | ES466213A1 (en) |
| FR (1) | FR2378124A1 (en) |
| GB (1) | GB1595251A (en) |
| MX (1) | MX145525A (en) |
| PT (1) | PT67559B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0230888Y2 (en) * | 1984-09-14 | 1990-08-21 | ||
| EP3216637B1 (en) | 2016-03-07 | 2019-11-27 | Webasto SE | Drive cable having a plastics cable body |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2411398A (en) * | 1942-08-05 | 1946-11-19 | Chrysler Corp | Plastic molding |
| FR1011827A (en) * | 1949-03-30 | 1952-06-27 | Method of manufacturing stop heads for brake cables for bicycles and other vehicles | |
| GB974810A (en) * | 1961-08-24 | 1964-11-11 | Mcmurdo Instr Company Ltd | Improvements in and relating to cords |
| FR1394383A (en) * | 1964-04-07 | 1965-04-02 | Teleflex Inc | Hose control device |
| BE793243A (en) * | 1971-12-27 | 1973-04-16 | Western Electric Co | METHOD AND APPARATUS FOR MOLDING PLASTIC MATERIAL AROUND ELASTIC INSERTED PARTS |
-
1978
- 1978-01-19 BR BR7800351A patent/BR7800351A/en unknown
- 1978-01-19 DE DE19782802127 patent/DE2802127A1/en active Granted
- 1978-01-20 MX MX172123A patent/MX145525A/en unknown
- 1978-01-20 JP JP515878A patent/JPS53108157A/en active Granted
- 1978-01-20 PT PT67559A patent/PT67559B/en unknown
- 1978-01-20 ES ES466213A patent/ES466213A1/en not_active Expired
- 1978-01-20 CA CA295,382A patent/CA1098421A/en not_active Expired
- 1978-01-20 GB GB2345/78A patent/GB1595251A/en not_active Expired
- 1978-01-20 FR FR7801690A patent/FR2378124A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| BR7800351A (en) | 1978-08-22 |
| FR2378124B1 (en) | 1983-08-26 |
| MX145525A (en) | 1982-03-02 |
| ES466213A1 (en) | 1979-01-16 |
| DE2802127C2 (en) | 1990-03-29 |
| PT67559A (en) | 1978-02-01 |
| JPS53108157A (en) | 1978-09-20 |
| JPS6117645B2 (en) | 1986-05-08 |
| PT67559B (en) | 1979-06-18 |
| GB1595251A (en) | 1981-08-12 |
| DE2802127A1 (en) | 1978-07-27 |
| FR2378124A1 (en) | 1978-08-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |