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Publication numberUS3748373 A
Publication typeGrant
Publication dateJul 24, 1973
Filing dateApr 14, 1972
Priority dateApr 14, 1972
Publication numberUS 3748373 A, US 3748373A, US-A-3748373, US3748373 A, US3748373A
InventorsRemy R
Original AssigneeRemy R
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Electrical contact device
US 3748373 A
Abstract
A linear electrical contact device comprising a central conductor, a tubular braid of metallic threads, and a tubular braid of interwoven insulating threads separating the central conductor and the tubular braid of metallic threads. The tubular braid of intermoven insulating threads forms a cord helically wound around the central conductor and is thermo-welded to the central conductor so as to be permanently secured thereto. The contact device can be used in combination with a vehicle window slide to activate when an object is caught in the window as the window is rolled up.
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Description  (OCR text may contain errors)

United States Patent 1 .Remy

111 3,748,373 [4 1 July 24,1973

1 1 ELECTRICAL CONTACT DEVICE [76] Inventor: Roger Remy, l7 & 35 DEstienne dOrves, Neuilly-Plaisance 93, France [22] Filed: Apr. 14, 1972 [21] Appl. No.: 244,122

[521' US. Cl... 174/115, 174/28, 174/29, I 200/6123, 200/85, 340/272 [51'] Int. Cl. H011) 7/22 5s Fie1d-otSearch.... 174/28, 29, 102 R, I 1 74/11311, 115;200/61.41,61.24,6l.23,85,

[56] References Cited UNITED STATES PATENTS 2,437,969 3/1948 Paul 200/86 R 2,416,979 3/1947 Burley.... 174/29 FOREIGN PATENTS OR APPLICATIONS 966,167 6/1965 Great Britain 200/86 R 1,193,029 5/1970 Great Britain ZOO/61.41 1,640,743 10/1970 Germany ZOO/61.41

Primary Examiner-Bemard A. Gilheany Assistant Examiner-A. T. Grimley Attorney-Raymond A. Robic I 5 7 ABSTRACT A linear electrical contact device comprising a central conductor, a tubular braid of metallic threads, and a tubular braid of interwoven insulating threads separating the central conductor and the tubular braid of metallic threads. The tubular braid of intermoven insulating threads forms a cord helically wound around the central conductor and is thermo-welded to the central conductor so as to be permanently secured thereto. The contact device can be used in combination with a vehicle window slide to activate when an object is caught in the window as the window is rolled up.

4 Claims, 4 Drawing Figures PATENIED JUL 2 41m 1. uf 11 1 .4 I) (1.1 Ju .Jfl. 3 4.4.

SUPER POLYAMIDE STAlNLESS STEEL FIG. 2

F'IG.1

FIG. 3

F'IGA- ELECTRICAL CONTACT DEVICE This invention relates to a linear electrical contact device of the type comprising two conductors arranged generally parallel and separated by insulating elements, which allow the conductors to be brought into contact by pressure applied at any position along the length of the device for, for example, closing an electrical circuit when the pressure is exerted and opening the circuit as soon as the pressure is released.

It is known that recent industrial developments of such linear electrical contact devices, in requiring both a certain amount of miniaturization and a large amount of flexibility so as to permit their general use for the security of electrically operated devices such as car windows, have revealed frequent hazards due to accidental closures of the circuit operated by such contact devices.

It is the object of the present invention to overcome the above drawbacks and, more particularly, to eliminate the risks of accidental contacts between the two coaxial conductors which are slightly spaced, on one hand, by using an helicoidal spacer element having a great elasticity and, on the other hand, by using an helicoidal spacer element which ispermanently secured to at least one of the conductors, so as to prevent any sliding thereof on such conductor, and, finally, by using a tubular braid of metallic threads which is impregnated with an elastomeric composition.

The novel characteristics of the invention as wells as others which are related thereto and the advantages of the present invention will be best understood by referring, by way of example, to the following description of a preferred embodiment of the invention and to the attached drawings in which:

FIG. 1 illustrates a partial longitudinal section of a portion of a cable forming an electrical contact device in accordance with the invention;

FIG. 2 illustrates a cross-section of the same cable taken along line AA" of FIG. 1;

FIG. 3 illustrates a cross-section taken along line 8-8 of FIG. 1; and i FIG. 4 illustrates a cross-section of the window-slide of a vehicle door adapted for insertion of a linear electrical contact device in at least one free edge thereof.

In FIGS. 1 to 3, there is shown a coaxial cable capable of detecting the pressure applied thereto and to ensure the closure or opening of an electrical circuit depending on whether or not the cable is subjected to a radial pressure. The cable or linear electrical contact device comprises a central conductor 1 spaced by an helically wound insulator 2 from a conductive tubular braid 3 impregnated with an outside elastomeric composition 4.

The helicoidal insulating spacer 2 is novel in that:

a. On one hand, it comprises a braid, lace or cord formed of small threads, preferably made of superpolyamide, interwoven tubularly so that the flattening thereof in the form on a band facilitates, by its own elasticity, the contact under the effect of a pressure as well as the separation when the pressure is removed from the coaxial conductors l and 3, and also the winding of such braid, lace or cord in an helicoidal form.

b. On the other hand, due to the non-negligeable electrical resistance of the central conductor 1, which is made of stainless steel including a nickel chrome composition, the joule effect resulting from the passage of an electrical current under low voltage which is of sufficient amplitude so as to cause a suitable heating of the central conductor 1 will cause the superpolyamide braid 2 contacting the central conductor to be brought to its melting point. This will very simply and economically cause the permanent adhesion of the superpolyamide braid on the central conductor 1, thus preventing all risks of subsequent sliding of the braid on the central conductor, even under low radius flexures.

In addition, the peripheral tubular conductive braid 3 is advantageously impregnated with an elastomeric composition 4 which is deposited thereon in any convenient way such as, for example by plunging it into a suitable bath, by conductive rollers, by pulverization using a pistol etc The elastomeric composition may be of the type commercially known as RHODORSYL RTV or RF4 sold by Rhone-Poulenc, which may be vulcanized at room temperature, or be made of a neoprene adhesive material having a resistance to crystallization, so as to maintain a maximum flexibility, and, for example, have the following composition in which the proportionsare given in weight:

The above composition will be used in solution, in an appropriate solvent system, at the rate of 20 to 40 per cent of dry extract, providing respectively solutionstfor use either with a pistol or in a bath.

It may also be mentioned that animprovement of the retification of the film may be obtained by adding 2 to 10 percent of an isocyanate of the type known commercially as Desmodur Ror F of BAYER, but to adisadvantage in the stability in pot. This isocyanate is added immediately before use.

Due to the impregnation of the braid of metallic threads with an elastomeric composition 4, the tubular assembly so formed becomes much more homogeneous and much more appropriate for supporting elastic deformations, even repeated, and at the same time for returning to its initial shape after removal of the applied pressure. The elimination of the risks of sliding of .the helicoidal winding 2 by thermal welding of such helicoidal winding on the central conductor 1 permits to realize low radius flexures of the linear contact device without incurring accidental contacts between the two coaxial conductors l and 3.

It may also be mentioned that the impregnation of the elastomeric composition 4 is also novel and advantageous in that it renders the whole assembly waterproof, thus also reducing the risk of deterioration of the contacts betweenthe two coaxial conductors l and 3. In addition, this facilitates the sliding of the linear contact device into an additional protective sheath, or in the tubular'housing 5, of at least one edge of an elastic profile 6 used as a vehicle window guide slide, such as shown in FIG. 4. Such an arrangement may be used to stop the operation of the electrical device actuating the window when an obstacle such as a child head is caught between the window and the frame of the door. It is to be understood that other means of fastening the linear contact device are also possible.

It is also be understood that the invention is not to be limited to the embodiment disclosed above, by way of example, but that various modifications may be made to such embodiment using equivalent devices.

As an example of equivalent devices, it may be mentioned the substitution of the joule effect to weld the hellical member 2 to the central conductor by a high frequency heating process wherein the linear contact device is passed through induction windings. This would facilitate the continuous fabrication of the device and obviate to use of electrical feeding contacts to permit the thermal welding of the insulating braid 2 onto one of the conductors. In addition, the elastomeric composition 4 could be replaced by a vinyl plastic which would be jelled by such high frequency heating or in an oven.

The embodiment of the invention in which an exclusive property or privilege is claimed are defined as follows:

l. A linear electrical contact device comprising a central conductor, a tubular conductor surrounding said central conductor and consisting of a braid of metallic threads, and a tubular braid of interwoven insulating threads separating said conductors and forming a cord helically wound on said central conductor, said cord being secured to at least one conductor so as to prevent sliding thereof with respect to said one conductor, said tubular braid of metallic threads being impregnated with a composition ensuring an homogeneous, waterproof and flexible contact device.

2. A contact device as defined in claim 1, wherein said central conductor is made of stainless steel having a certain resistance and wherein said cord is made of interwoven superpolyamide threads, said cord being secured to said central conductor by passing current through the central conductor which will cause thermal welding of the cord onto the central conductor.

3. The combination of an extruded profile used in a vehicle window slide and having an edge with a tubular housing, with a linear electrical contact device inserted in said tubular housing, said linear electrical contact device comprising a central conductor, a tubular conductor surrounding said central conductor and consisting of a braid of metallic threads, and a tubular braid of interwoven insulating threads separating said conductors and forming a cord helically wound on said central conductor, said cord being secured to at least one conductor so as to prevent sliding thereof with respect to said one conductor, said tubular braid of metallic threads being impregnated with a composition ensuring an homogeneous, waterproof and flexible contact device.

4. A contact device as defined in claim 3, wherein said central conductor is made of stainless steel having a certain resistance and wherein said cord is made of interwoven superpolyamide threads, said cord being secured to said central conductor by passing current through the central conductor which will cause thermal welding of the cord onto the central conductor.

- UNITED sT TEs PATENT OFFICE CERTIFICATE OF CORRECTION 3,748,373 July 24, 1973 7 Dated Ptent No.

Ifiyehtofls) [Q Roger Remy It is certified that error appears in the above-identified paterrt end that saidLetters Patent are hereby corrected as "shownbelow:

On the; cover sheet insert '[30] Foreign A pli ation: Priority Data Mar. 17, 1972 Frariee Sighe d'and sealed this 27th day of August 1974.

(SEAL) A;ttest:

gccoY M. GIBS'ONI, JR. 0. MARSHALL DANN 1' Af t testing Officer Commissioner of Patents ORM PC4650 (10-59) 'USCOMM-DC 60376-P69 if US. GOVERNMENT {'RINTING OFFICE I969 (B -3654M.

UNITED STATES rATENT OFFICE CERTIFICATE ()F IORRECTEON 3,748,373 July 24, 1973 Patent No. Dated Inventor(s) Roger Remy It is certified that error appears the above-identified patent and that said Letters Patent are hereby corrected as shown below:

On the cover sheet insert [30] Foreign France Signed and sealed this 27th day of August 1974.

(SEAL) Attest:

MCCOY M. GIBSON, JR.

. C. MARSHALL DANN A'ttesting Officer Commissioner of Patents *ORM Po-wso (10-69) USCOMM-DC 60376-2 69 US. GOVERNMENT PRINTING OFFICE: 1959 0-366-334,

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2416979 *Apr 27, 1943Mar 4, 1947Cilley Burley JosephElectric cable
US2437969 *Jan 24, 1946Mar 16, 1948Elliott F BarlowDeformable switch
DE1640743A1 *Nov 30, 1967Oct 22, 1970Kabel Metallwerke GhhElektrisches Kontaktkabel
GB966167A * Title not available
GB1193029A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4075616 *Nov 12, 1975Feb 21, 1978Rait Joseph MDetector for alarm system
US4259990 *Jun 20, 1979Apr 7, 1981Kabel-und Metallwerke, Gutehoffnungshutte A.G.Spacer in concentric tube systems
US4742196 *Sep 18, 1987May 3, 1988Bicc Public Limited CompanyElongate pressure-actuated electrical switch
US4762970 *Aug 14, 1987Aug 9, 1988Bicc Public Limited CompanyElongate pressure actuated electrical switch
US5742002 *Jul 20, 1995Apr 21, 1998Andrew CorporationAir-dielectric coaxial cable with hollow spacer element
US6328126 *Dec 26, 2000Dec 11, 2001Automotive Technologies International, Inc.Crush sensing vehicle crash sensor
US6557889May 22, 2001May 6, 2003Automotive Technologies International Inc.Crush velocity sensing vehicle crash sensor
US6724195 *Nov 27, 2002Apr 20, 2004Jerome R. LurtzContact sensor
US7635043Dec 27, 2002Dec 22, 2009Automotive Technologies International, Inc.Crash sensor arrangement for controlling deployment of an occupant restraint device
WO2003085685A2 *Mar 28, 2003Oct 16, 2003Jerome R LurtzA pressure, temperature and contact sensor
Classifications
U.S. Classification174/115, 200/85.00R, 174/29, 174/28, 200/61.23
International ClassificationH01B7/10
Cooperative ClassificationH01B7/10
European ClassificationH01B7/10