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Publication numberUS3803374 A
Publication typeGrant
Publication dateApr 9, 1974
Filing dateOct 27, 1972
Priority dateNov 5, 1971
Also published asCA961078A, CA961078A1, DE2252839A1
Publication numberUS 3803374 A, US 3803374A, US-A-3803374, US3803374 A, US3803374A
InventorsDelgendre J, Guigot V
Original AssigneeFrance Etat
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Pyrotechnic circuit maker or breaker
US 3803374 A
Abstract  available in
Images(2)
Previous page
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Claims  available in
Description  (OCR text may contain errors)

United States Patent [1 1 Delgendre et a1.

1111 3,803,374 1451 Apr. 9, 1974 PYROTECHNIC CIRCUIT MAKER 0R BREAKER I [75] Inventors: Jacques Claude Delgendre, Toulon;

Vincent Louis Eugene Guigot, La Seyne Sur Mer, both of France [73] Assignee: LEtat Francais Delegation Ministerielle Pour LArmement Direction Technique des Armements Terrestres, Paris, France 22 Filed: Oct. 27, 1972 21 Appl. No.: 301,534

[30] Foreign Application'Priority Data Nov. 5, 1971 France 71.39783 [521 US. Cl ZOO/61.08, 200/6l.19, 200/83 N [51] Int. Cl. H0lh 39/00 [58] Field of Search 200/6108, 61.19, 61.8, 200/83 N; 337/114, 401

[5 6] References Cited UNITED STATES PATENTS 3,277,255 10/1966 Mattsson et a1. ZOO/61.08 2,697,766

12/1954 Goldmuntz 200/83 N X 2,768,261 10/1956 Mathisen 200/83 N 3,264,438 8/1966 Gay ZOO/61.08 X 3,335,239 8/1967 Fey ZOO/61.08 2,999,912 12/1961 Kincaid et a1 200/618 X 3,049,601 8/1962 Hardesty ZOO/61.08 X 2,511,955 6/1950 West ZOO/61.19 X

Primary Examiner.lames R. Scott Attorney, Agent, or FirmStevens, Davis, Miller & Mosher [57] ABSTRACT A pyrotechnic device designed to irreversibly make or break a permanent electrical contact as controlled by an initial electrical, mechanical or pyrotechnic signal, the device comprising an elastomer head mounted on the pyrotechnic cartridge and containing a hollow interior portion in which two electrical contact members are disposed, a deformable partition separating the pyrotechnic charge from the elastomer body, and a member which is moved into contact ,with the two contact elements to either make or break an electrical connection'between the two contacts depending upon whether the third element is composed of conducting or insulating material.

3 Claims, 5 Drawing Figures PATENTEDAPR 9 1914 FIG.3

sum 2 or 2 FIG.4

The present invention relates to a device intended to make or break a permanent electrical contact using a pyrotechnic element triggered by electrical, mechanical or pyrotechnic means.

It is common knowledge that pyrotechnic switches have a number of advantages compared to electromagnetic switches: absence of external powersource, low weight, fast operation speed, resistance against environmental conditions. The making of the contact, however, and the transmission of theenergy supplied by the pyrotechnic element, or at least thefirst of these functions, is performed by the rotational or linear motion of mechanical parts.'This design leads to a certain complexity prejudicial to reliability and restricting the miniaturization possibilities while also rendering the switch sensitive to shock and vibration.

The device according to this invention enables thesedrawbacks to be overcome, since making of contact-.-

and energy transmission takes place solely through non-elastic deformation, no part being affected by an overall motion.Moreover, the simplicity of, the switch results in a significantly. lower production cost and, as the inertia of the operating parts is very small, the operating time can thus be reduced.

The invention resides in a pyrotechnic device designed to irreversibly and permanently make or break an electrical contact wh'en initiated by an electrical, mechanical or pyrotechnical signal. The device is characterized by the fact that it housesthe following elements in a singleshell: a hollow elastomer insert carrying two metal conducting elements, each connected to one of two connecting pins; a pyrotechnic element separated from the insert by a deformable partition, the

pyrotechnic element when energized by an electrical, mechanical or pyrotechnic source actsto make or break the electrical contact between the two'metal conducting elements. In one embodiment, theinvention described herein is employed asa switch in which electrical contactbetween the two conducting elements is a third electrically conducting element brought'into contact with the first two metal conducting elements by deformationof thepartition. I I I r i In a second embodiment, t he invention is used as a circuit-breaker;the preestablished contact between the two conducting elements is broken by an insulating element which is inserted between't he two conducting elements by the deformation of the partition.'

The invention will be described below with reference to the appended drawing, wherein:

rated, as by molding. Part 3 is a ring whereas parts 4 and 5 are half-rings insulated from each other. Parts 4 and 5 are connected to connecting pins 7 which extend through and out of body 1 via sealed insulating bushings 6.-

A pyrotechnic cartridge 8 is screwed into body I with deformable partition 18 in between. This cartridge contains an explosive charge and an electrical pyrotechnic squib 10 fitted with connecting pins 11 which extend through and out of the cartridge via a sealed insulating bushing 12.

The above device operates as follows: on application of an appropriate electrical signal, charge 9 explodes, thereby deforming partition 18 by an amount greater than the space provided between the contact elements when in rest position. Part 3 is therefore pressed against parts 2, being compressed, ensures contact despite opposing forces, especially vibratory, which would be exerted upon the metal parts.

In other practical applications of the invention, the

' explosion is initiated through other means, e.g. percussion or transmission bya detonating fuse. The shape of the metal contact elements can also vary, e.g. for the purpose of simultaneously closing several circuits.

FIG. 2 shows the portion of the circuit breaker embodiment of this invention which differs from that of the switch, or circuit maker, embodiment described above. In both devices, the head or'body portion 1 (of the circuit maker) and 1' (of thecirc uit breaker) are screwed onto the pyrotechnic cartridge 8. In the circuit breaker, metal studs 15 and 16 are molded into the elastomer hollow body 1 and are connected to pins 7 which extend out of the body through sealed insulating bushings 6'. Studs 15 and 16 support rectangularly shaped contact blades 13 and 14. The free ends of blades 13 and 14 have U-shaped cutouts which overlap in-opposed fashion to form a circular opening 19 see FIG. 2a) into which the tip of a conical punch 17 is in- FIG. 1 shows a sectional view of the circuit maker embodiment with'contacts in a normally open position;

FIG. 2shows asectional'view of the circuit breaker embodiment withcontacts a'normally'closed posi- FIG. 2a shows adetail of the contac't elements of the" circuit breaker embodiment; FIG. 3 shows'a sectionalview of the circuit maker embodiment with contacts in a closed position; and

* FIG. 4 shows a sectional view of the circuit breaker embodiment with contacts in an open position.

In the embodiment of FIG. 1, a'body 1 houses the switch proper which consists ofa hollow elastomerinsert 2 into which metal parts 3, 4 and Sare incorpo ing the contacts and where the mechanical or climatic serted. The punch 17 is tightly'fitted to the bottom of the body 1' to form a surface on which the deformable partition 18' rests when the body is assembled onto the cartridge8, as shown.

The device above operates as follows: deformation of partition 18 in the manner described previously causes the deformation of the elastomer box bottom, and punch 17, which is fastened to that bottom, is forced upwardly in the direction of deformation of partition 18, breaking the contact between the blades 13 and 14 which then are irreversibly insulated bythe insulating material of the punch wedged between these two contact elements.

The device according to the invention can be used whenever a permanent electrical contact is to be made or broken as controlled by an electrical or mechanical signal. It is of particular value in the case where an external powersource is not available for closing or openenvironment precludes the use of-electromagnetic or solid-state switches and relays; For these reasons, the

device is particularly useful for performing logic operav tions or electrical controls in sequential systems which are to be operated once only," as found on missiles, space launch vehicles, underwater fixtures, etc. A few examples can be mentioned, such as the arming and control of the ignition circuit of power plants, the separation of stages, the opening of valves and the energization'of electricalequipment carried by missiles.- l

What is claimed is:

l. A pyrotechnic device designed to irreversibly make or break a permanent electrical contact as controlled by an initial electrical, mechanical or pyrotechnic signal, comprising: a cartridge having a cavity containing a pyrotechnic charge and means to detonate said charge; an elastomer body disposed on said carnation of the said pyrotechnic charge.

2. The device according to claim 1, wherein said third element comprises an electrically conducting member which, when urged into contact with said first and second elements upon deformation of said partition, completes an electrical circuit between said first and second elements. g

3. The device according to claim 1, wherein said third element comprises an insulating member which, when urged into engagement with said first and second contact elements upon deformation of said partition, separates said first and second elements from contact with each other to thereby break a pre-existing completed electrical circuit between said first and second elements. I

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3921945 *Jul 25, 1974Nov 25, 1975Us NavyTrain resonant car-body rocking detector system
US3930629 *Aug 7, 1974Jan 6, 1976The United States Of America As Represented By The Secretary Of The NavyOverheated journal bearing derailment prevention system
US4029859 *Oct 14, 1975Jun 14, 1977The United States Of America As Represented By The Secretary Of The NavyThermal sensor and current generator
US4150266 *Jan 27, 1977Apr 17, 1979Networks Electronic Corp.Miniature pyrotechnic squib switch, single pole, normally open
US4939326 *Dec 19, 1988Jul 3, 1990Weinblatt Lee SFlat switch insertable into a magazine and usable as part of a survey technique for readership of publications
US5019679 *Jan 17, 1990May 28, 1991Weinblatt Lee SFlat switch insertable into a magazine and usable as part of a survey technique for readership of publications
US5262753 *Jul 24, 1992Nov 16, 1993Giat IndustriesPyrotechnic controlled electrical switch with conductive foil bridging contact disk
US5463260 *Oct 20, 1993Oct 31, 1995Nsk Ltd.Trigger device for triggering a passive restraint device in a car
US6344788 *Dec 6, 1999Feb 5, 2002PyroalliancePyrotechnically operated electrical contactor
US6411190 *Aug 2, 2000Jun 25, 2002Yazaki CorporationCircuit breaker
US6448884 *Aug 16, 2000Sep 10, 2002Yazaki CorporationCircuit breaker
US6496098Jun 23, 1998Dec 17, 2002Dynamit Nobel Gmbh Explosivstoff-Und SystemtechnikPyrotechnic active element
US6979021Aug 7, 2003Dec 27, 2005Autoliv Asp, Inc.Integral initiator assembly for use in inflator devices
US7123124 *Oct 17, 2003Oct 17, 2006Special Devices, Inc.Pyrotechnic circuit breaker
US7222561 *Feb 2, 2004May 29, 2007Delphi Technologies, Inc.Pyromechanical cutting element
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US7498923Aug 16, 2005Mar 3, 2009Iversen Arthur HFast acting, low cost, high power transfer switch
US8154377 *Apr 7, 2006Apr 10, 2012Auto Kabel Managementgesellschaft MbhPassive triggering of a circuit breaker for electrical supply lines of motor vehicles
US8654501Mar 16, 2012Feb 18, 2014Abb Technology AgLow-, medium-, or high-voltage switching device with chemical charge means
US9016133 *Jan 5, 2011Apr 28, 2015Nxp, B.V.Pressure sensor with pressure-actuated switch
US9172222 *Sep 25, 2012Oct 27, 2015Abb Technology AgMedium-voltage switchgear assembly having a short-circuiting unit
US20040221638 *Feb 2, 2004Nov 11, 2004Uwe BredePyromechanical cutting element
US20050029787 *Aug 7, 2003Feb 10, 2005Young Anthony M.Integral initiator assembly for use in inflator devices
US20050083164 *Oct 17, 2003Apr 21, 2005Caruso Keith W.Pyrotechnic circuit breaker
US20050083165 *Oct 13, 2004Apr 21, 2005Tirmizi Abrar A.Pyrotechnic circuit breaker
US20060049027 *Aug 16, 2005Mar 9, 2006Iversen Arthur HFast acting, low cost, high power transfer switch
US20080204184 *Apr 7, 2006Aug 28, 2008Auto Kabel Managementgesellschaft MbhPassive Triggering of a Circuit Breaker for Electrical Supply Lines of Motor Vehicles
US20110237102 *Oct 12, 2009Sep 29, 2011Auto Kabel Managementgesellschaft MbhPlug-In Connection for an Occupant Protection Means
US20120167659 *Jan 5, 2011Jul 5, 2012Nxp B.V.Pressure sensor with pressure-actuated switch
US20130020182 *Sep 25, 2012Jan 24, 2013Abb Technology AgMedium-voltage switchgear assembly having a short-circuiting unit
DE2951984A1 *Dec 22, 1979Jul 23, 1981Calor Emag Elektrizitaets AgHV contact breaker with explosive charge - has disc retained peripherally against electrode and separated from contact spindle by explosion
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WO1997041581A1 *Apr 24, 1997Nov 6, 1997Dynamit Nobel Gmbh Explosivstoff- Und SystemtechnikPyrotechnic circuit-breaking element for electric circuits
Classifications
U.S. Classification200/61.8, 200/61.19, 200/83.00N
International ClassificationH01H39/00
Cooperative ClassificationH01H39/004
European ClassificationH01H39/00C