US2919326A - Electrical relay and contact assembly - Google Patents

Electrical relay and contact assembly Download PDF

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Publication number
US2919326A
US2919326A US585508A US58550856A US2919326A US 2919326 A US2919326 A US 2919326A US 585508 A US585508 A US 585508A US 58550856 A US58550856 A US 58550856A US 2919326 A US2919326 A US 2919326A
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United States
Prior art keywords
contact
spring
fixed contact
yoke
assembly
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Expired - Lifetime
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US585508A
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English (en)
Inventor
Bernard J Greenblott
Martin J Kelly
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International Business Machines Corp
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International Business Machines Corp
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Priority to US585508A priority Critical patent/US2919326A/en
Priority to FR1182277D priority patent/FR1182277A/fr
Priority to GB15636/57A priority patent/GB851933A/en
Priority to DEI13225A priority patent/DE1122136B/de
Application granted granted Critical
Publication of US2919326A publication Critical patent/US2919326A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/54—Contact arrangements

Definitions

  • This invention relates to an electrical relay and contact assembly, and particularly to an improved electrical contact assembly for use in relays or other electromechanical devices where high operating speeds are required and contact bounce must be eliminated as much as possible.
  • Another object of the invention is to provide an improved electrical contact assembly in which the frequency of vibration of the contact springs is substantially lowered, although the total length of the springs is sufficiently long to permit contact spring material of substan tial cross sectional area to be employed.
  • a further object of this invention is to provide an improved electrical relay and a contact assembly especially suited for automatic production and assembly.
  • Still another object of this invention is to provide an electrical contact assembly having an operating spring member which is constrained by the inherent spring forces in the member from motion at at least two points falling substantially on nodes of'flexural vibration of the spring member.
  • a further object of the invention is to provide an improved electrical contact assembly having a reentrant or looped operating'spring member, in which one leg of the loop is constrained from motion by the inherent spring force in the member, and in which at least one other pointof restraint is provided at a point at or near the bight of the looped contact member, so that the spring member is constrained at substantially two nodal points of the flexural vibration wave length of thes pring member.
  • Yet another object of the present invention is to provide an improved electrical contact assembly in which a looped operating spring member is confined in a suitable enclosure to provide a degree of frictional damping for reducing unwanted vibration'in the member.
  • a contact assembly in which a resilient spring member, or movable contact member is arranged with a free end which is moved into or out of engagement with a fixed contact member.
  • the opposite endof the spring member is constrained from motion preferably by the inherent resilience of the spring member, and additionally, a constraining force is applied at an intermediate point along the length of the spring member, at or near a point on the spring member which is a nodal point for flexural vibrations in the spring member. Since the spring member is thus effectively restrained at one of its ends and at or near a nodal point along its length, the flexural vibration is highly damped. Thus the free end of the spring has little or no vibrating movement as a result of its impact with the cooperating stationary contact member when the contacts close.
  • the spring members are made in a re-entrant or looped configuration, approximating a U-shape. In this manner the frequency of fiexural vibration is kept relatively low without increasing the length of the contact assembly or reducing the crosssectional area of the spring members.
  • the operating spring members are enclosed in a slot in a block or base of insulating material, so that their motion is'confined substantially to a single plane, and so that the friction between the springs and the walls of the enclosing slot provides a degree of damping for any vibration which may occur.
  • the improved relay of this invention comprises a contact assembly of the type described above, and an electromagnetic operating structure for operating the contacts.
  • a common datum surface is provided from which all critical dimensions of the relay are taken, so that indi-vidual parts may be fabricated .and assembled without cumulative tolerances building up to a point where auto matic manufacturing operations would not be feasible.
  • Onesurface of the relay yoke may be taken as the reference or datum surface, for example, and all critical dimensions measured therefrom.
  • a mating surface is provided on the base or contact block, to which the magnet yoke is attached, and all fixed contact elements are accurately located with respect to this surface.
  • the movable contact elements are adaptedto be preformed or prestressed, so that they may be inserted in the contact assembly by machine operation and will have the re quired amount of spring tension when so assembled. In this manner, the contact assembly and the electromagnetic operator portion of the relay may be made separately, with the assurance that the final asembly will find all parts properly located so that little or no manual adjustment is required.
  • Fig. l is a diagrammatic plan view of an electrical relay constructed in accordance with a preferred embodiment of the invention.
  • Fig. 2 is a diagrammatic elevation view of the relay.
  • Fig. 3 is an isometric view of the relay
  • Fig. 4 is a schematic cross-sectional view of the contact assembly illustrating certain of the relations between the various parts.
  • the relay includes an electromagnetic operating mechanism, and a plurality of electrical contacts adapted to be operated by the operating mechanism, all in a unitary assembly.
  • a stationary yoke structure 3 of magnetic material having an E-shaped configuration, is provided, the outer Patented Dec. 29, 1959 I legs being attached by rivets 4 or other suitable fastening means to a base block 5, which is molded or otherwise formed from suitable insulating material, such as the socalled plastic materials.
  • the center leg 7 of the stationary yoke member 3 has mounted thereon an energizing winding 8, which may be wound on any suitable type of bobbin and slipped onto the center leg 7 during assembly of the relay.
  • a U-shaped armature 9 of magnetic material is provided, with the legs of the U notched at the ends as shown so that the armature is retained in place by forked portions 10 of a suitable spring member 11, which is fastened to the yoke 3 by any suitable means, such as the rivets 12.
  • the spring member serves to position the armature on the yoke and to define the pivot point for the legs of the armature.
  • Projections or shoulders of member 13 engage legs 14 of the spring member 11, as most clearly seen in Figs. 1 and 3, and the parts are proportioned and arranged so that a force is exerted on the contact operating member 13, and hence the armature 9, tending to pivot the bight of the U-shaped armature away from the stationary yoke.
  • the projections or shoulders of operating member 13 are arranged to engage the surface of yoke 3 when the armature 9 is released, to thereby act as a stop which limits the travel of operating member 13.
  • each position is the equivalent of a transfer position having a normally open contact, a normally closed contact, and a common contact.
  • Each position includes at least a first and a second fixed contact element such as those designated by reference characters 16 and 18.
  • an additional fixed contact element 16 is provided, so that two of the elements 16 lie on either side of a common fixed element 18.
  • the fixed contact elements 16 and 18 may be stamped or otherwise formed, after which they are molded in place in the insulating base 5.
  • the ends of the elements 16 and 18 which project from the left-hand side of the relay, as seen in the drawings, may be formed to act as pins or plugs, receivable by suitable sockets in a suitable mounting or holding block for the relay, not shown. Obviously, the number of contact positions may be varied as desired.
  • Rectangular slots or openings 19 are provided in the base block 5, one for each of the contact assemblies, to accommodate the movable contact springs or members 20.
  • the slots confine the motion of the movable contact springs and additionally provide frictional damping 'as a result of the movable springs rubbing on the sides of the slots, that is to say, the Width of the slot is sufficient to permit the movable springs to flex during operation, with a small clearance, but in view of the length of the springs and the fact that the springs are free to cant slightly within the slot, portions of the springs will rub on the walls of the slot during the flexing so that some amount of frictional damping is provided.
  • Each of the movable spring members 20 is in the form of a looped or U-shaped length of suitable spring material.
  • the spring members are provided in pairs, with one pair being used for each normally open or normally closed contact.
  • the spring members 20 are preformed before assembly to provide the proper degree of spring force when engaging the fixed contact elements, and are then inserted in the slots 19.
  • One end of each contact spring member is provided with a hook-shaped bend 22, which engages a slot 24 in the fixed contact element 16, thus anchoring the spring 20 in place, and additionally providing an electrical connection to one end of spring 20.
  • the contact assembly thus provided is of the type known as permissive make, in which each of the movable contact springs is prestressed so that when unimpeded, it will engage its free end with the common stationary contact member with the required amount of contact pressure to insure a low contact resistance.
  • the contacts are operated out of engagement by forcing the movable contact away from the stationary contact as a result of operation of the contact operating member, either by the electromagnet when the relay is energized 1n the case of a normally closed contact, or by the armature return spring when the electromagnet is de-energized in the case of a normally open contact.
  • Such an arangement is advantageous over the more usual flexure type of contact, since the work required for contact actuation is one-half that required by flexure contacts.
  • the effects of armature rebound are eliminated insofar as contact pressure and contact bounce are concerned.
  • the spring rate of the movable contact member is dictated by a number of requirements, particularly reasonable manufacturing tolerances, for a given type of spring material.
  • the cross-sectional area and the effective length determine the spring rate, for a given type of material, but since the cross-sectional area cannot be reduced below that required for maximum allowable safe stress limits, it follows that, for a given cross-sectional area, a predetermined length of spring is required, if the spring rate is to be within suitable limits.
  • the use of a U-shaped or reentrant spring member thus permits a total spring length twice that which is available with a straight spring, in the same available space.
  • a further advantage is gained in the use of the looped or re-entrant movable contact spring, in that vibrational damping is obtained which further obviates contact bounce.
  • the movable contact member 20 has its one end 22 fixed from motion in the plane of operation, since the spring force retains the hooked end 22 of the spring in the slot 24 of the fixed contact element 16 under all states and operating conditions. It can be shown that, for a curved bar having a given total length, the frequencies of vibration are not only lower than those for a straight bar of the same length, but also that the nodes of the vibrations are forced toward the middle of the bar.
  • the configuration of the parts is such that spring forces of the movable contact member at the hooked end 22 and at the free end are exerted at the points designated by the referenced arrows 28 and 30, respectively.
  • the unbalanced force thus created forces the looped portion of the movable contact member into engagement with the contact slot wall at the point designated by referenced arrow 32.
  • the operating force which is applied at the point designated by the referenced arrow 34, enters the system at a point between the forces exerted by the spring at points 30 and 28, so that, under all static*and operating conditions, the-spring member is forced against the wall of'the contact slot at point 32.
  • the restraint of the movable spring member 20' at the one end 22, and at the point 32 near the middle of its total length causes an internal damping of the spring member which acts to minimize vibrations occurring upon impact of the free or operating end Z6of the spring with the common fixed constant member 18.
  • the parts are proportioned and arranged so that nearly all fabrication and assembly operations may be carried out by suitably designed machines.
  • The. fixed contact elements 16 and 18 are molded into the base block 5, which may be made of a material having a high degree of dimensional stability, so that the various dimensions may be held within close tolerances without undue machining of the various surfaces after molding. Such machining as is necessary may be done in a onepass operation after the base is molded.
  • the datum surface may be chosen to be the surface of the magnet yoke 3 against which the armature 9 seats. All parts are dimensioned from this surface, and since this surface is accurately located with respect to the contact assembly, as a resultof the base 5 being attached to the yoke 3 with this surface as an interface, it follows that all dimensions may be readily maintained within reasonable tolerances when the contact assembly is fastened to the yoke.
  • the movable contact springs may be cut and preformed from suitable lengths of material, and thereafter inserted in their slots, all by machine operation.
  • the yoke and armature may be made from any suitable magnetic material, such as sintered magnetic material and the assembly thereto of the spring 11, which may be preformed, can be carried out by a machine operation.
  • the contact operating member 13 can be afiixed tothe armature 9 by any suitable means, such as riveting or molding, also by machine operation.
  • the legs of yoke 3 are riveted or otherwise fastened to the block or base 5, with the contactoperating member inserted between the opposed movable contact fingers. Thereafter, the leads for the operating coil 8 are soldered or otherwise connected to suitable pins in the block 5 which act as coil terminals for the relay, as shown in Fig. 3.
  • this invention provides a novel type of electrical relay structure, embodying a number of features lending the relay to mass production with very little manual assembly or adjustment procedures. Additionally, a unique type of electrical contact assembly is provided, economical in space and manufacturing cost, and providing bounce-free operation. As previously pointed out, the contact structure may be employed in devices other than relays,.such as cam or manually operated switches.
  • a switching device comprising a first and a second fixed contact element, a looped resilient contact spring member having a first and a second straight portion connected by a bight portion with all of said portions lying in a common plane including said first and said second fixed contact elements, said spring member being prestressed to cause said straight portions to engage said fixed contact elements, contact operating means effective at times to engage'one of said straight portions of said spring member and disengage it from the associated fixed contact element, the other straight portion continuously engaging its associated fixed contact element and means confining the motion of said spring member in said plane.
  • a switching device comprising a block of insulating material, a first and a second fixed contact element located on opposite sides of an opening in said block, a looped resilient contact spring member having a first and a second straight portion connected by a bight portion with all of said portions lying in a common plane, said contact spring member being disposed in said opening and prestressed to cause said straight portions to engage said fixed contact elements, and contact operating means effective at times to engage one of said straight portions of said spring member and disengage it from the associated fixed contact element, the other straight portion continuously engaging its associated fixed contact element.
  • a switching device comprising a first and a second fixed contact element, a looped resilient contact spring member having a first and a second straight portion connected by a bight portion, each of said portions lying in the same plane and disposed between said fixed contact elements, the end of said first straight portion of said spring member remote from said bight portion engaging said first fixed contact element, and the end of said second straight portion of said spring member remote from said bight portionengaging said second fixed contact element, means for confining the motion of said spring member in said plane, and contact operating means for at times engaging one of said straight portions and moving said straight portion out of engagement with the associated fixed contact element, the other of said straight portions continuously engaging its associated fixed contact element.
  • a switching device comprising a first and a second fixed contact element, a looped resilient contact spring member having a first and a second straight portion connected by a bight portion, each of said portions lying in the same plane and disposed between said fixed contact elements, the end of said first straight portion of said spring member remote from said bight portion engaging said first fixed contact element, and the end of said second straight portion remote from said bight port-ion engaging said second fixed contact element, means for confining the motion of said spring member in said plane, means for restraining the motion of said spring member at said bight portion, and contact operating means for at times engaging one of said straight portions and moving said straight portion out of engagement with the associated fixed contact element, the other straight portion continuously engaging its associated fixed contact element.
  • a switching device comprising a first and a second fixed contact element, a looped resilient contact spring having a first and a second straight portion connected by a bight portion, each of said portions lying in the same plane and disposed between said fixed contact elements, said first straight portion being anchored to said first fixed contact element, said second straight portion engaging said second fixed contact element, operating meansfor moving said second straight portion out of ens gagement with said second fixed contact element against the resilience of said member, and confining means for confining the motion of said contact spring to said plane, said confining means frictionally engaging at least a portion of said contact spring.
  • An electrical contact assembly comprising, in combination, a base block of insulating material having a rectangular slot therein, a first and a second fixed contact element disposed at opposite ends of said slot, a looped resilient spring member disposed in said slot, said spring member having first and second straight portions connected by a bight portion and prestressed to cause the extremities of said first and second straight portions remote from said bight portion to engage said first and second fixed contact elements, and a contact operating member effective at times to disengage one of said straight portions of said spring member from the associated fixed contact element, the other of said straight portions remaining continuously engaged with its associated fixed contact element.
  • An electrical contact assembly comprising, in combination, a base block of insulating material having a rectngular slot therein, a first and a second fixed contact element disposed at opposite ends of the slot, a looped resilient spring member disposed in said slot, said spring member having first and second straight portions conneted by a bight portion and prestressed to cause the extremities of said first and second straight portions remote from said bight portion to engage said first and second fixed contact elements and to cause a portion of said first straight section adjacent said bight portion to engage the adjacent end wall of said slot, and a contact operating member effective at times to disengage said second straight portion of said spring member from its associated fixed contact element, the extremity of said first straight portion remaining continuously engaged with said first fixed contact element.
  • An electrical contact assembly comprising, in combination, a base block of insulating material having a rectangular slot therein, a first and a second fixed contact element disposed at the opening of said slot and at opposite ends thereof, a looped resilient contact spring member disposed in said slot, said spring member having a first and a second straight portion connected by a bight portion, and prestressed so that said first and second Straight portions engage said first and second fixed contact elements, the lines of action of the spring forces on said first and second fixed contact elements being staggered so that a force is exerted on said bight portion to cause it to engage the end of said slot associated with said first straight portion and said first fixed contact element, and contact operating means for at times exerting a force on the free end of said second.
  • An electrical contact assembly comprising, in combination, a base block of insulating material having a rectangular slot therein, a first and a second fixed contact element disposed at opposite ends of said slot, said first fixed contact element having an opening formed therein adjacent said slot, said second fixed contact element having a contact surface adjacent said slot, a pair of prestressed looped resilient spring contact members disposed in said slot, each of said spring contact members having a first and a second straight portion connected by a bight portion, said first straight portion having its free end shaped to engage the opening in said first fixed contact element, and said second straight portion having its free end adapted to engage the contact surface of said second fixed contact element, the spring force exerted by said spring member having a first line of action through said first fixed contact element and a second line of action through said second fixed contact element, said first and second lines of action being staggered so that the resultant force causes the bight portion of said spring members to engage the end wall of said slot adjacent said first fixed contact element, and contact operating means effective at times to exert
  • a relay comprising a yoke of magnetic material having a first and a second outer leg and a center leg, one surface of each of said legs lying in a common datum plane, an armature pivoted on said first and second outer legs of said yoke for an angular motion in a direction substantially transverse to said common plane, biasing spring.
  • armature means for biasing said armature away from said yoke, an operating winding mounted on said center leg of the yoke and effective when energized to create flux in the yoke and thereby attract the armature to the yoke, a contact operating member operatively connected to said armature, a base block provided with a contact assembly including a plurality of fixed contact elements molded therein and including a plurality of slots between opposite ones of said fixed contact elements, a plurality of movable contact spring members, one for each set of opposed fixed contact elements, disposed in said slots, and each of said movable contact spring members having one end thereof disposed for operation by said contact operating member into and out of engagement with one of said fixed contact elements and the other end engaged with the opposite one of said fixed contact elements, a datum surface on said base block for referencing all dimensions of said contact assembly, and means for fastening Said base block to said yoke with said common datum plane of said yoke and said datum surface coplanar.
  • a relay comprising a yoke of magnetic material having a first and a second outer leg and a center leg, one surface of each of said legs lying in a common datum plane, an armature pivoted on said first and second outer legs of said yoke for an angular motion in a direction substantially transverse to said common plane, biasing spring means for biasing said armature away from said yoke, an operating winding mounted on said center leg of said yoke and effective when energized to create flux in the yoke and thereby attract the armature to the yoke, a contact operating member operatively connected to said armature, a base block of insulating material provided with a contact assembly including a plurality of slots extending therethrough, a plurality of fixed contact elements molded in said base block on opposite sides of said slots, a plurality of looped resilient contact spring members, one pair of said spring members disposed in each of said slots, each of said members having first and second straight portions connected by a bight portion
  • An electrical relay structure adapted for automatic production comprising a contact assembly and an electromagnetic operator assembly; said contact assembly including a. base block of insulating material having a reference surface thereon, and a plurality of slots therein, a plurality of pairs of fixed contact elements molded in said block, one pair of fixed contact elements being provided for each of said slots and disposed with one of the pairs of contact elements located at one end of said slot and the other of the pair of contact elements located at the other end of said slot, a plurality of pairs of prestressed looped resilient contact spring members, each having first and second straight portions connected by a bight portion, one pair of said spring members being disposed in each of said slots so that said first and second straight portions engage the fixed contact elements associated therewith; said electromagnetic operator assembly comprising an E-shaped yoke of magnetic material having a reference surface including one side of the outer legs of the yoke, an operating coil mounted on the center leg of said yoke, an armature pivoted on the outer legs of said yoke, a
  • a switching device comprising a pair of fixed contact elements, a U-shaped resilient contact spring member having one leg in continuous engagement with one of said fixed contacts and flexed to urge the other leg into engagement with the other of said fixed contact elements, means normally holding said other leg away from engagement from its related fixed contact element and operable at times to permit said other leg to move into engagement with its related fixed contact element, and antibounce means comprising means engaging said spring member in the vicinity of a nodal point of fiexural vibration along the length of said spring member to dampen the vibration of the contact spring member.
  • a switching device comprising first and second fixed contact elements, a U-shaped resilient contact spring member having a first and a second leg connected by a bight portion, said contact spring member being prestressed and disposed with said first and said second legs engaging said first and said second fixed contact elements, means engaging said bight portion, and operating means etfective at times for disengaging one of said legs of said spring member from the associated fixed contact element, the other of said legs remaining continuously engaged with its associated fixed contact element.
  • a relay comprising a yoke of magnetic material having a first and a second outer leg and a center leg, one surface of each of said legs lying in a common datum plane, anarmature pivoted on said first and second outer legs of said yoke for an angular motion in a direction substantially transverse to said common plane, biasing spring means for biasing said armature away from said yoke, an operating winding mounted on said center leg of the yoke and effective when energized to create flux in the yoke and thereby attract the armature to the yoke, a contact operating member operatively connected to said armature, a base block provided with a contact assembly including a plurality of fixed contact elements molded therein and including a plurality of slots between opposite ones of said fixed contact elements, a plurality of movable contact spring members, one for each set of opposed fixed contact elements, disposed in said slots, and each of said movable contact spring members having one end thereof disposed for operation by said contact operating member into and out

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electromagnets (AREA)
  • Relay Circuits (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
US585508A 1956-05-17 1956-05-17 Electrical relay and contact assembly Expired - Lifetime US2919326A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US585508A US2919326A (en) 1956-05-17 1956-05-17 Electrical relay and contact assembly
FR1182277D FR1182277A (fr) 1956-05-17 1957-05-13 Montage de contacts et de relais électriques
GB15636/57A GB851933A (en) 1956-05-17 1957-05-16 Improvements in or relating to electrical contact assemblies
DEI13225A DE1122136B (de) 1956-05-17 1957-05-17 Prellarme elektrische Kontaktanordnung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US585508A US2919326A (en) 1956-05-17 1956-05-17 Electrical relay and contact assembly

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Publication Number Publication Date
US2919326A true US2919326A (en) 1959-12-29

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US585508A Expired - Lifetime US2919326A (en) 1956-05-17 1956-05-17 Electrical relay and contact assembly

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US (1) US2919326A (de)
DE (1) DE1122136B (de)
FR (1) FR1182277A (de)
GB (1) GB851933A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3102974A (en) * 1960-03-16 1963-09-03 Westinghouse Air Brake Co Subminiature relays
US3143625A (en) * 1960-11-08 1964-08-04 Ford Motor Co Electrical push button switch assembly
US3165607A (en) * 1961-08-11 1965-01-12 Ibm Armature for electro-magnetic relay

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1199371B (de) * 1962-09-05 1965-08-26 Siemens Ag Kontaktsystem fuer elektrische Schalter mit Prelldaempfung durch eine Daempfungsfeder

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1048670A (en) * 1906-03-16 1912-12-31 Samuel M Kintner Contact for electromagnetic mechanism.
US1143676A (en) * 1913-05-10 1915-06-22 Acme Register Company Circuit-closer.
FR614773A (fr) * 1926-04-19 1926-12-22 Procédé pour interrompre automatiquement le passage du courant électrique dans les voies aériennes dans le cas où aurait lieu un détachement de celles-ci
US1702490A (en) * 1926-03-06 1929-02-19 L S Brach Mfg Co Electrical relay
US1839034A (en) * 1930-02-10 1931-12-29 Supreme Instr Corp Jack switch
US2769064A (en) * 1953-09-22 1956-10-30 Gen Electric Electric switch

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL55005C (de) * 1938-04-05
DE892927C (de) * 1943-02-27 1953-10-12 Siemens Ag Daempfungsfederanordnung fuer elektrische Schaltgeraete, insbesondere fuer Relais

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1048670A (en) * 1906-03-16 1912-12-31 Samuel M Kintner Contact for electromagnetic mechanism.
US1143676A (en) * 1913-05-10 1915-06-22 Acme Register Company Circuit-closer.
US1702490A (en) * 1926-03-06 1929-02-19 L S Brach Mfg Co Electrical relay
FR614773A (fr) * 1926-04-19 1926-12-22 Procédé pour interrompre automatiquement le passage du courant électrique dans les voies aériennes dans le cas où aurait lieu un détachement de celles-ci
US1839034A (en) * 1930-02-10 1931-12-29 Supreme Instr Corp Jack switch
US2769064A (en) * 1953-09-22 1956-10-30 Gen Electric Electric switch

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3102974A (en) * 1960-03-16 1963-09-03 Westinghouse Air Brake Co Subminiature relays
US3143625A (en) * 1960-11-08 1964-08-04 Ford Motor Co Electrical push button switch assembly
US3165607A (en) * 1961-08-11 1965-01-12 Ibm Armature for electro-magnetic relay

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Publication number Publication date
GB851933A (en) 1960-10-19
DE1122136B (de) 1962-01-18
FR1182277A (fr) 1959-06-24

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