US3800252A - Electrical switching device and contact arrangement therefor - Google Patents

Electrical switching device and contact arrangement therefor Download PDF

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US3800252A
US3800252A US00350321A US35032173A US3800252A US 3800252 A US3800252 A US 3800252A US 00350321 A US00350321 A US 00350321A US 35032173 A US35032173 A US 35032173A US 3800252 A US3800252 A US 3800252A
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contact
spring
card
springs
stationary
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G Aigner
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Siemens AG
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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

  • ABSTRACT Contact arrangement for electrical switching device and electromagnet and armature for alternately moving two switch arms into contact-making and contactbreaking positions.
  • Two spaced contact springs insulated from each other are clamped in a switch housing.
  • a stationary center contact is disposed between the contact springs and has a bifurcatedcontact end in the form of two legs, one bent tong-like toward one contact spring and the other bent tong-like toward the other contact spring.
  • the two contact springs are biased to engage the stationary contacts and are operated to accommodate one contact spring to engage one stationary contact as the other contact spring is disengaged from the other stationary contact, by a card-like operating member of insulating material carried on the end of the armature.
  • the operating mem ber has a slot intermediate its ends through which one contact spring extends and forms a support at its end opposite the armature for the other contact spring.
  • Electromagnetic relays have heretofore attained testing and operating contact forces by means of the bias of movable contact springs carrying the movable contacts.
  • Such contact arrangements are called selfpressure contact arrangements and are operated in one'position by the force of an-armature to open one contact and close the other by the bias of the contact spring.
  • Such contact arrangements have a middle contact consisting of a single contact leg with a contact rivet on each side of the leg and disposed between the movable contacts. In such a contact spring set, the contact distances are prescribed by the height of the contact rivet as well as by the dimensions of the operating member for disengaging one movable contact and accommodating the other movable contact to close a circuit.
  • Adjustment of the distances between the movable and stationary contacts with such an arrangement is not feasible in the practical design of a relay and if it were feasible, the best adjustment that can be attainedis an adjustment of one space between the stationary and movable contacts at the expense of the space between the other stationary and movable contacts.
  • the middle contact is rigid and single movable contactsare on both sides of the movable contact, the distances between the contacts many times are so close that the leakage paths and air paths between the individual contact carriers are too small for many applications.
  • the interchanging of large contact rivets on the movable contacts for smaller contact rivet does not enlarge the leakage paths and air path to an extent appreciable to make it feasible to attain larger leakage and air paths by the use oflarger rivets.
  • the middle contact is divided into two rigid contact parts tong-like in shape with one contact part spaced upwardly of the center line extending along the points of connection of the contact parts and the other contact part extending downwardly of this center line the same distance as the upper contact.
  • two rigid center contacts have heretofore been used requiring the manufacture of two parts, attached separately in insulating member for the contact springs.
  • a contact switch arrangement in which a single middle contact is carried in the insulating block for the movable contacts and has tong-like stationary contact ends extending upwardly and downwardly of the center line of the middle contact and parallel with each other, with the movable contacts spaced laterally of each other and extending parallel to the part of the middle contact mounted in the insulating base.
  • the two middle contacts are, therefore, generally parallel to the two movable contact springs on opposite sides thereof.
  • An advantage of such a design of middle contacts in cooperation with outer, movable contacts is that the distance between the contacts can be adjusted in a simple manner over a far wider range than has heretofore been possible where the stationary contacts are on opposite sides of a single rigid contact member.
  • a further advantage of the invention is that with the tong-like arrangement of center stationary contacts of the invention, the stationary contacts can be provided with different contacts for specific application purposes and the distance of the contact carriers from each other is increased due to the tong or fork-like arrangement of the stationary contacts, making it possible to use a thicker and more rigid arrangement of stationary contacts than has heretofore been possible.
  • a further advantage of the present invention is that the transfer of armature movement of the relay to the two movable contacts is by a card-like actuating member made from a relatively thick insulating material and arranged to receive and support the ends of the two movable contacts to provide a stable actuating connection from the armature of the relay to the movable contacts.
  • the actuating card may be used for a single movable contact as well as for two contacts and when so used, a slot opening into one side of the card extends along opposite sides of the single movable contact and is so arranged that the actuating card may be inserted in the switch housing from its side with the slot spaced in accordance with the required distance between the stationary and movable contacts when disengaged.
  • This actuating card made from insulating material is further of advantage where the relays are enclosed in box-like housings totally enclosing the free ends of the movable contacts and rendering the free ends of these contacts inaccessible.
  • FIG. 1 is a view in side elevation of an electromagnetic relay constructed in accordance with the principles of the present invention with one end wall of the relay removed.
  • FIG. 2 is a horizontal sectional view taken substantially along line A-A of FIG. 1.
  • FIG. 3 is a plan view of an actuating card constructed in accordance with the principles of the present invention for insertion between the armature and contact springs from one side of the switch housing;
  • FIG. 4 is a top plan view of the card shown in FIG. 3 with the card inverted for inserting from the opposite side of the switch housing.
  • FIG. 1 of the drawings I have shown an electromagnetic relay constructed in accordance 'with the principles of the invention and carried in a housing or casing I which may be made of insulating material and magnet coil 2 having a yoke 3 mounted at one end thereof and extending along the top of the magnet coil parallel thereto and forming a pivotal mounting for an armature 4.
  • the armature 4 has one leg 4a extending along the core of the coil 2 and a right-angled leg 4b extending parallel to the coil 2 and having a free end having a slot therein for receiving a tongue 5b of a rigid actuating card 5.
  • the actuating card 5 is shown as being relatively thick in comparison with the contacts operated thereby and is made from an insulating material to insulate contacts 6 and 7 from each other as well as move said contacts against their bias.
  • the contacts 6 and 7 are spring-like contacts in the form of elongated contact springs secured to and extending through inwardly extending bosslike supports 7a and 7b formed integrally with the housing 1 and extending inwardly therealong.
  • a rigid middle contact 8 is carried between the bosses 7a and 7b and may be molded in said bosses and includes a shank 8a extending for the length of the bosses7a and 7b and having a projecting free end which is split tong-like and forms two parallel vertically spaced contacts 9 and 10 spaced laterally of each other and extending parallel to the shank 8a.
  • a terminal 8b extends from the shank 8a through an end wall of the housing 1 and may serve as a solder contact while a terminal 8c extends'laterally of the contact 8 through a side wall of the housing and also may serve as a solder contact.
  • solder contacts 8b and 80 may be arranged in accordance with the direction of installation of the relay and the solder connection 80 extend from the opposite side wall from that shown where the position of the relay during installation is reversed.
  • the contact spring 6 is also provided with two solder connections 6a and 6b.
  • the contact spring 7 may be provided with similar solder connections.
  • the solder connection 7c is the only solder connection herein shown since the other solder connection would be directly beneath the solder connection 6a.
  • the contact spring 6 abuts the top of said card as shown in FIGQ 3 while the contact spring 7 fits within the slot 11 as shown in FIGS. 3 and 4.
  • the lower contact spring 7 is on the upper surface of the slot 111 during downward movement of the actuator card and thus breaks the circuit between the contacts 7 and 10 and accommodates the bias of the spring contact 6 to complete a circuit between the contacts 6 and 9.
  • the top of the actuator card 5 engaging the bottom of the contact spring 6 will open a circuit between the contacts 6 and 9 and the slot 11 will accommodate the closing of a circuit between the contacts 7 and 10, by the bias of the contact spring 7.
  • the bridge 5a of the actuator card is relatively wide in relation to the entire width of the card and thus gives the card sufficient stability to effectively perform its switch opening and closing operations and since the slot 11 opens to one side of the card, the card may be inserted into engagement with the armature and the contact springs 6 and 7 from one side or the other of the switch casing by merely inverting the card.
  • the slot 11 opening to one side of the actuator card enables a wide bridge to be attained in contrast to a slot in the center of the card, necessitating small bridges on opposite sides of the slot, and making it necessary to insert the actuator card from the end of the switch casing rather than from either side thereof. Insertion and removal of the bridge from the end of the switch casing cannot be done without removing an end wall of the casing to accommodate this operation.
  • the card has sufficient rigidity to effectively operate over a long period of time and can be fastened to the armature and contact springs in a straight and vertical assembly without requiring the use of screws or other fastening means.
  • a leaf spring 12 is suitably connected between the yoke 3 and actuator card 5 to serve as a return spring for the actuator card and armature upon deenergization of the coil 2.
  • said stationary contact having a shank mounted in the insulating material of said switch casing and having bifurcated tong-like contact ends spaced laterally and vertically relative to each other,
  • each contact end being aligned with an associated contact spring and being generally parallel to each other, and
  • said contact springs being biased towards said contact ends
  • actuating means for said contact springs disengaging one contact spring from its associated contact end and accommodating the other contact spring to engage its associated contact end by its spring bias.
  • the stationary contact has a one-part shank having a slot extending along the contact end thereof with a contact end on one side of said slot bent upwardly in an angular direction and then bent parallel to said shank, with the contact on the other side of said slot bent downwardly in an angular direction and then bent to extend parallel to said shank.
  • an actuator card detachably carried by said electromagnet and having operative connection with said contact springs accommodating engagement of one contact spring with its stationary contact by the bias of said spring and having-actuating engagement with the other of said contact springs to disengage said contact spring from its associated contact end.
  • actuator card is wider than the combined either side of the casing depending upon the posi width of the two contact springs
  • a slot opens to one side of said actuator card for receiving one of said contact springs and so ar- I claim 4, Including a return spring returning said armaranged relative to said actuator card as to provide 5 i a mlat-wely wide bridge extending along one Side of ture and actuator card upon deenergization of said said slot and connecting opposite ends of said card, electromagnetand accommodating said card to be inserted from tion of installation of the switch and casing. 5.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electromagnets (AREA)
  • Contacts (AREA)

Abstract

Contact arrangement for electrical switching device and electromagnet and armature for alternately moving two switch arms into contact-making and contact-breaking positions. Two spaced contact springs insulated from each other are clamped in a switch housing. A stationary center contact is disposed between the contact springs and has a bifurcated contact end in the form of two legs, one bent tong-like toward one contact spring and the other bent tong-like toward the other contact spring. The two contact springs are biased to engage the stationary contacts and are operated to accommodate one contact spring to engage one stationary contact as the other contact spring is disengaged from the other stationary contact, by a card-like operating member of insulating material carried on the end of the armature. The operating member has a slot intermediate its ends through which one contact spring extends and forms a support at its end opposite the armature for the other contact spring.

Description

United States Patent [191 Aigner ELECTRICAL SWITCHING DEVICE AND CONTACT ARRANGEMENT THEREFOR [75] Inventor: Georg Aigner, Munich, Germany [73] Assignee: Siemens AG, Berlin and Munich,
Germany [22] Filed: Apr. 12, 1973 [21] Appl. No.: 350,321
Primary Examiner-Harold Broome Attorney, Agent, or Firm-Hill, Sherman, Meroni, Gross & Simpson [451 Mar. 26, 1974 [5 7] ABSTRACT Contact arrangement for electrical switching device and electromagnet and armature for alternately moving two switch arms into contact-making and contactbreaking positions. Two spaced contact springs insulated from each other are clamped in a switch housing. A stationary center contact is disposed between the contact springs and has a bifurcatedcontact end in the form of two legs, one bent tong-like toward one contact spring and the other bent tong-like toward the other contact spring. The two contact springs are biased to engage the stationary contacts and are operated to accommodate one contact spring to engage one stationary contact as the other contact spring is disengaged from the other stationary contact, by a card-like operating member of insulating material carried on the end of the armature. The operating mem ber has a slot intermediate its ends through which one contact spring extends and forms a support at its end opposite the armature for the other contact spring.
5 Claims, 4 Drawing Figures ELECTRICAL SWITCHING DEVICE AND CONTACT ARRANGEMENT THEREFOR FIELD OF THE INVENTION Contact arrangement for electrical switching devices in which two movable contacts on opposite sides of a rigid stationary contact are operated by a common operating member.
BACKGROUND, SUMMARY AND ADVANTAGES OF INVENTION Electromagnetic relays have heretofore attained testing and operating contact forces by means of the bias of movable contact springs carrying the movable contacts. Such contact arrangements are called selfpressure contact arrangements and are operated in one'position by the force of an-armature to open one contact and close the other by the bias of the contact spring. Such contact arrangements have a middle contact consisting of a single contact leg with a contact rivet on each side of the leg and disposed between the movable contacts. In such a contact spring set, the contact distances are prescribed by the height of the contact rivet as well as by the dimensions of the operating member for disengaging one movable contact and accommodating the other movable contact to close a circuit. Adjustment of the distances between the movable and stationary contacts with such an arrangement is not feasible in the practical design of a relay and if it were feasible, the best adjustment that can be attainedis an adjustment of one space between the stationary and movable contacts at the expense of the space between the other stationary and movable contacts. Moreover, where the middle contact is rigid and single movable contactsare on both sides of the movable contact, the distances between the contacts many times are so close that the leakage paths and air paths between the individual contact carriers are too small for many applications. The interchanging of large contact rivets on the movable contacts for smaller contact rivet does not enlarge the leakage paths and air path to an extent appreciable to make it feasible to attain larger leakage and air paths by the use oflarger rivets.
By the present invention, the middle contact is divided into two rigid contact parts tong-like in shape with one contact part spaced upwardly of the center line extending along the points of connection of the contact parts and the other contact part extending downwardly of this center line the same distance as the upper contact. With such contact arrangements, however, two rigid center contacts have heretofore been used requiring the manufacture of two parts, attached separately in insulating member for the contact springs.
By the arrangement of the present invention, a contact switch arrangement is provided in which a single middle contact is carried in the insulating block for the movable contacts and has tong-like stationary contact ends extending upwardly and downwardly of the center line of the middle contact and parallel with each other, with the movable contacts spaced laterally of each other and extending parallel to the part of the middle contact mounted in the insulating base. The two middle contacts are, therefore, generally parallel to the two movable contact springs on opposite sides thereof.
An advantage of such a design of middle contacts in cooperation with outer, movable contacts is that the distance between the contacts can be adjusted in a simple manner over a far wider range than has heretofore been possible where the stationary contacts are on opposite sides of a single rigid contact member.
A further advantage of the invention is that with the tong-like arrangement of center stationary contacts of the invention, the stationary contacts can be provided with different contacts for specific application purposes and the distance of the contact carriers from each other is increased due to the tong or fork-like arrangement of the stationary contacts, making it possible to use a thicker and more rigid arrangement of stationary contacts than has heretofore been possible.
A further advantage of the present invention is that the transfer of armature movement of the relay to the two movable contacts is by a card-like actuating member made from a relatively thick insulating material and arranged to receive and support the ends of the two movable contacts to provide a stable actuating connection from the armature of the relay to the movable contacts.
The actuating card may be used for a single movable contact as well as for two contacts and when so used, a slot opening into one side of the card extends along opposite sides of the single movable contact and is so arranged that the actuating card may be inserted in the switch housing from its side with the slot spaced in accordance with the required distance between the stationary and movable contacts when disengaged.
This actuating card made from insulating material is further of advantage where the relays are enclosed in box-like housings totally enclosing the free ends of the movable contacts and rendering the free ends of these contacts inaccessible.
Other objects, features and advantages of the invention will be readily apparent from the following description of a preferred embodiment thereof, taken in conjunction with the accompanying drawings, although variations and modifications may be effected without departing from the spirit and scope of the novel concepts of the disclosure.
DESCRIPTION OF THE DRAWINGS FIG. 1 is a view in side elevation of an electromagnetic relay constructed in accordance with the principles of the present invention with one end wall of the relay removed.
FIG. 2 is a horizontal sectional view taken substantially along line A-A of FIG. 1.
FIG. 3 is a plan view of an actuating card constructed in accordance with the principles of the present invention for insertion between the armature and contact springs from one side of the switch housing; and
FIG. 4 is a top plan view of the card shown in FIG. 3 with the card inverted for inserting from the opposite side of the switch housing.
DESCRIPTION OF PREFERRED FORM OF THE INVENTION In FIG. 1 of the drawings, I have shown an electromagnetic relay constructed in accordance 'with the principles of the invention and carried in a housing or casing I which may be made of insulating material and magnet coil 2 having a yoke 3 mounted at one end thereof and extending along the top of the magnet coil parallel thereto and forming a pivotal mounting for an armature 4. The armature 4 has one leg 4a extending along the core of the coil 2 and a right-angled leg 4b extending parallel to the coil 2 and having a free end having a slot therein for receiving a tongue 5b of a rigid actuating card 5. The actuating card 5 is shown as being relatively thick in comparison with the contacts operated thereby and is made from an insulating material to insulate contacts 6 and 7 from each other as well as move said contacts against their bias. The contacts 6 and 7 are spring-like contacts in the form of elongated contact springs secured to and extending through inwardly extending bosslike supports 7a and 7b formed integrally with the housing 1 and extending inwardly therealong. A rigid middle contact 8 is carried between the bosses 7a and 7b and may be molded in said bosses and includes a shank 8a extending for the length of the bosses7a and 7b and having a projecting free end which is split tong-like and forms two parallel vertically spaced contacts 9 and 10 spaced laterally of each other and extending parallel to the shank 8a. A terminal 8b extends from the shank 8a through an end wall of the housing 1 and may serve as a solder contact while a terminal 8c extends'laterally of the contact 8 through a side wall of the housing and also may serve as a solder contact. The solder contacts 8b and 80 may be arranged in accordance with the direction of installation of the relay and the solder connection 80 extend from the opposite side wall from that shown where the position of the relay during installation is reversed. The contact spring 6 is also provided with two solder connections 6a and 6b. The contact spring 7 may be provided with similar solder connections. The solder connection 7c is the only solder connection herein shown since the other solder connection would be directly beneath the solder connection 6a.
Referring now in particular to the actuator card 5,
the contact spring 6 abuts the top of said card as shown in FIGQ 3 while the contact spring 7 fits within the slot 11 as shown in FIGS. 3 and 4. The lower contact spring 7 is on the upper surface of the slot 111 during downward movement of the actuator card and thus breaks the circuit between the contacts 7 and 10 and accommodates the bias of the spring contact 6 to complete a circuit between the contacts 6 and 9. In an opposite direction of movement of the armature 4 and leg 4b thereof, the top of the actuator card 5 engaging the bottom of the contact spring 6 will open a circuit between the contacts 6 and 9 and the slot 11 will accommodate the closing of a circuit between the contacts 7 and 10, by the bias of the contact spring 7.
It will be noted from FIGS. 3 and 4 that the bridge 5a of the actuator card is relatively wide in relation to the entire width of the card and thus gives the card sufficient stability to effectively perform its switch opening and closing operations and since the slot 11 opens to one side of the card, the card may be inserted into engagement with the armature and the contact springs 6 and 7 from one side or the other of the switch casing by merely inverting the card. Moreover, the slot 11 opening to one side of the actuator card enables a wide bridge to be attained in contrast to a slot in the center of the card, necessitating small bridges on opposite sides of the slot, and making it necessary to insert the actuator card from the end of the switch casing rather than from either side thereof. Insertion and removal of the bridge from the end of the switch casing cannot be done without removing an end wall of the casing to accommodate this operation.
Moreover, with the contact card shown affording an actuating connection to the two contact springs 6 and 7, the card has sufficient rigidity to effectively operate over a long period of time and can be fastened to the armature and contact springs in a straight and vertical assembly without requiring the use of screws or other fastening means.
A leaf spring 12 is suitably connected between the yoke 3 and actuator card 5 to serve as a return spring for the actuator card and armature upon deenergization of the coil 2.
I claim as my invention:
1. In an electrical switch and contact arrangement therefor,
a switch casing made from insulating material,
two flat vertically spaced contact springs carried by said switch casing and insulated from each other by said casing,
a stationary contact between said contact springs and insulated therefrom, said stationary contact having a shank mounted in the insulating material of said switch casing and having bifurcated tong-like contact ends spaced laterally and vertically relative to each other,
each contact end being aligned with an associated contact spring and being generally parallel to each other, and
said contact springs being biased towards said contact ends, and
. actuating means for said contact springs, disengaging one contact spring from its associated contact end and accommodating the other contact spring to engage its associated contact end by its spring bias.
2. The contact arrangement of claim 1, in which the stationary contact has a one-part shank having a slot extending along the contact end thereof with a contact end on one side of said slot bent upwardly in an angular direction and then bent parallel to said shank, with the contact on the other side of said slot bent downwardly in an angular direction and then bent to extend parallel to said shank.
3. The electrical switch and contact arrangement of claim 2, wherein the actuatingmeans for the contact springs includes,
an electromagnet,
an armature operated thereby and having a portion extending along the end of said electromagnet'and a right-angled portion extending generally parallel to said electromagnet, and
an actuator card detachably carried by said electromagnet and having operative connection with said contact springs accommodating engagement of one contact spring with its stationary contact by the bias of said spring and having-actuating engagement with the other of said contact springs to disengage said contact spring from its associated contact end.
4. The electrical switch and contact arrangement of claim 3,
wherein the actuator card is wider than the combined either side of the casing depending upon the posi width of the two contact springs, and
wherein a slot opens to one side of said actuator card for receiving one of said contact springs and so ar- I claim 4, Including a return spring returning said armaranged relative to said actuator card as to provide 5 i a mlat-wely wide bridge extending along one Side of ture and actuator card upon deenergization of said said slot and connecting opposite ends of said card, electromagnetand accommodating said card to be inserted from tion of installation of the switch and casing. 5. The electrical switch and contact arrangement of

Claims (5)

1. In an electrical switch and contact arrangement therefor, a switch casing made from insulating material, two flat vertically spaced contact springs carried by said switch casing and insulated from each other by said casing, a stationary contact between said contact springs and insulated therefrom, said stationary contact having a shank mounted in the insulating material of said switch casing and having bifurcated tong-like contact ends spaced laterally and vertically relative to each other, each contact end being aligned with an associated contact spring and being generally parallel to each other, and said contact springs being biased towards said contact ends, and actuating means for said contact springs, disengaging one contact spring from its associated contact end and accommodating the other contact spring to engage its associated contact end by its spring bias.
2. The contact arrangement of claim 1, in which the stationary contact has a one-part shank having a slot extending along the contact end thereof with a contact end on one side of said slot bent upwardly in an angular direction and then bent parallel to said shank, with the contact on the other side of said slot bent downwardly in an angular direction and then bent to extend parallel to said shank.
3. The electrical switch and contact arrangement of claim 2, wherein the actuating means for the contact springs includes, an electromagnet, an armature operated thereby and having a portion extending along the end of said electromagnet and a right-angled portion extending generally parallel to said electromagnet, and an actuator card detachably carried by said electromagnet and having operative connection with said contact springs accommodating engagement of one contact spring with its stationary contact by the bias of said spring and having actuating engagement with the other of said contact springs to disengage said contact spring from its associated contact end.
4. The electrical switch and contact arrangement of claim 3, wherein the actuator card is wider than the combined width of the two contact springs, and wherein a slot opens to one side of said actuator card for receiving one of said contact springs and so arranged relative to said actuator card as to provide a relatively wide bridge extending along one side of said slot and connecting opposite ends of said card, and accommodating said card to be inserted from either side of the casing depending upon the position of installation of the switch and casing.
5. The electrical switch and contact arrangement of claim 4, including a return spring returning said armature and actuator card upon deenergization of said electromagnet.
US00350321A 1972-04-19 1973-04-12 Electrical switching device and contact arrangement therefor Expired - Lifetime US3800252A (en)

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DE19722219135 DE2219135C3 (en) 1972-04-19 Changeover contact arrangement for electromagnetic relays

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JP (1) JPS4920649A (en)
AT (1) AT328028B (en)
CH (1) CH558076A (en)
ES (1) ES413457A1 (en)
FR (1) FR2180914A1 (en)
GB (1) GB1409200A (en)
IT (1) IT982039B (en)
NL (1) NL7305223A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4010433A (en) * 1974-08-22 1977-03-01 Matsushita Electric Works, Ltd. Electromagnetic relay
US4101856A (en) * 1976-04-07 1978-07-18 Fritz Kolle Electrical switching relay construction and housing therefor
US4122420A (en) * 1977-01-13 1978-10-24 Esterline Electronics Corporation Permissive-make electromagnetic switch
US5572176A (en) * 1994-02-18 1996-11-05 Siemens Aktiengesellschaft Relay having a movable slide and method for the manufacture thereof
WO2012017282A1 (en) 2010-07-31 2012-02-09 Larsen & Toubro Limited An improved contact arrangement for high fault current withstand in a low voltage switching device
US20140312998A1 (en) * 2013-04-19 2014-10-23 Abl Ip Holding Llc Modular Relay Sub-Assembly

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5535277A (en) * 1978-09-05 1980-03-12 Meidensha Electric Mfg Co Ltd Detector for gas leakage of air accumulator
JPH01160346U (en) * 1988-04-27 1989-11-07
JPH081408B2 (en) * 1993-11-10 1996-01-10 マツダ株式会社 Leak and moving state measuring method and apparatus
DE19804572A1 (en) * 1997-05-05 1999-08-12 Schrack Components Ag Relay with contact springs

Citations (4)

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Publication number Priority date Publication date Assignee Title
US2198704A (en) * 1937-06-08 1940-04-30 Union Switch & Signal Co Electrical relay
US3256401A (en) * 1963-04-03 1966-06-14 American Mach & Foundry Spring pile-up electromagnetic relay
US3433906A (en) * 1966-12-19 1969-03-18 Switchcraft Lever switch having means to avoid transient switching
US3626132A (en) * 1969-01-16 1971-12-07 Heddernheimer Metallwarenfab Switch contacts

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2198704A (en) * 1937-06-08 1940-04-30 Union Switch & Signal Co Electrical relay
US3256401A (en) * 1963-04-03 1966-06-14 American Mach & Foundry Spring pile-up electromagnetic relay
US3433906A (en) * 1966-12-19 1969-03-18 Switchcraft Lever switch having means to avoid transient switching
US3626132A (en) * 1969-01-16 1971-12-07 Heddernheimer Metallwarenfab Switch contacts

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4010433A (en) * 1974-08-22 1977-03-01 Matsushita Electric Works, Ltd. Electromagnetic relay
US4101856A (en) * 1976-04-07 1978-07-18 Fritz Kolle Electrical switching relay construction and housing therefor
US4122420A (en) * 1977-01-13 1978-10-24 Esterline Electronics Corporation Permissive-make electromagnetic switch
US5572176A (en) * 1994-02-18 1996-11-05 Siemens Aktiengesellschaft Relay having a movable slide and method for the manufacture thereof
WO2012017282A1 (en) 2010-07-31 2012-02-09 Larsen & Toubro Limited An improved contact arrangement for high fault current withstand in a low voltage switching device
US20140312998A1 (en) * 2013-04-19 2014-10-23 Abl Ip Holding Llc Modular Relay Sub-Assembly
US9196441B2 (en) * 2013-04-19 2015-11-24 Abl Ip Holding Llc Modular relay sub-assembly

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JPS4920649A (en) 1974-02-23
NL7305223A (en) 1973-10-23
ES413457A1 (en) 1976-01-16
CH558076A (en) 1975-01-15
ATA288073A (en) 1975-05-15
GB1409200A (en) 1975-10-08
IT982039B (en) 1974-10-21
AT328028B (en) 1976-02-25
FR2180914A1 (en) 1973-11-30
DE2219135B2 (en) 1977-03-24
DE2219135A1 (en) 1973-10-25

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