US2864913A - Relay contact arrangement and operation - Google Patents

Relay contact arrangement and operation Download PDF

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US2864913A
US2864913A US491093A US49109355A US2864913A US 2864913 A US2864913 A US 2864913A US 491093 A US491093 A US 491093A US 49109355 A US49109355 A US 49109355A US 2864913 A US2864913 A US 2864913A
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contact
springs
insulating members
laterally
contact point
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US491093A
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Schmitz Walter
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Siemens and Halske AG
Siemens Corp
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Siemens Corp
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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
    • H01H50/62—Co-operating movable contacts operated by separate electrical actuating means

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  • This invention relates to relays, especially for use in railroad signal apparatus, and is particularly concerned with a contact arrangement resulting in improved and more efiicient operation of such relays.
  • the energy for producing the required contact pressure may be greatly reduced by arranging the contacts chainlike in mutually supporting series relationship so that the contact pressure is propagated from contact to contact. Insulating members may for this purpose be disposed between the individual contacts forming supports therefor. The opening of the individual contacts may be effected, for example, by first releasing the contact pressure and thereafter removing parts of the contact elements laterally, that is, in a direction perpendicular to the direction in which the contact pressure is exerted.
  • FIG. 1 shows in schematic manner an embodiment comprising a pair of magnets for respectively supplying the contact pressure and for effecting the relative displacement of certain contact elements.
  • Fig. 2 illustrates in like manner an embodiment comprising a single magnet for controlling both functions
  • Fig. 3 represents an embodiment in which the contact pressure is produced by exertin on the contacts a pulling force.
  • the embodiment according to Fig. 1 comprises springs carrying contact points indicated at 1 to 8.
  • the contact points are in closed position disposed in pairs forming respectively coacting contacts.
  • Each contact comprising two contact points is supported relative to the next successive contact by an insulating member such as the member 9 disposed between the contacts having the points and respectively.
  • the insulating member extending from the spring carrying the contact point 1 is disposed underneath the pressure controlling magnet 10 having a pivoted armature with an extension which presses in attracted position upon the corresponding insulating member to press the coacting contacts downwardly against a stationary insulating member 12.
  • the pressure on the coacting contacts will be relieved and they will lie loosely in their respective positions.
  • the disconnect control magnet 19 may now be energized to attract its armature 14 so as to-rotate the rod 15 about the pivot axis of the shaft 17 journalled at 16, thereby swinging the springs carrying the contact points 5 to 8 laterally outwardly away from the springs carrying the respective ly coacting contact points 1 to 4.
  • Numeral 18 designates a spring for restoring the springs carrying the contact points 5 to 8, upon deenergization of the magnet 19, to their positions for coaction with the contact points 1 to 4.
  • a single magnet 16 having an armature 15 for performing the functions of the magnets 10 and 19 employed in Fig. l.
  • the parts of the relay of the embodiment Fig. 2 are shown in operated position, the magnet 16 being assumed to be energized.
  • the armature 15 is accordingly attracted.
  • the rod 20 carrying the contact springs 542/21, 6a/22, 70/23, Sal/24 has been pulled down and the contact points carried by these springs are pressed against their coacting contact points carried by the springs 1a to 4a and 28 to 31.
  • This pressure is propagated downwardly from contact to contact through the medium of insulating members carried by the intervening springs 6a/ 22, 7a/23, 8a/ 24.
  • the contact points are thus held under the requisite pressure throughout their corresponding circuit closing operation.
  • the springs 1a to 4a and 28 to 31 may be connected by suitable means with desired, respectively associated circuits.
  • the force of the spring 25 will be effective to raise the rod 20 and with it its contact springs 5a/21, 8a/24 and the contact pressure between the various contacts is thus immediately relieved.
  • the force of the spring 18 linked to the lever 19 extending from the rod 20 will rotate such rod within its journals including the journal pin 17.
  • the rod 26 carries a small roller 26 and such roller will ride upwardly along a stationary wedge-shaped camming member 27 thus raising the rod 20 and therewith the springs 5a/21 /24, thus further relieving the pressure on the various contacts.
  • the springs 5a to So and 21 to 24 will be rotated laterally outwardly relative to their respectively cooperating springs 1a to 5:1 and 28 to 31 to open the circuits controlled thereby.
  • the arrangement may be such that contact points on the springs such as the springs 5a to 8:1 and 21 to 24, respectively, face in their laterally retracted position other springs for coaction therewith.
  • the guide roller may thereby cooperate with means in the terminal position thereof, for freeing a spring for actuation.
  • the insulating members shown such as the members 9 in Fig. 1, may be wedge-shaped and secured on a common actuating member, and the latter may be rotated in the manner in which the springs are rotated in the illustrated examples, so as to move the insulating members relative to associated contact springs to effect the operation thereof either in closing or opening sense as desired.
  • the contacts may be arranged arcuately about a fixed axis and dilferent levels may be utilized for contact operation.
  • the contact springs are either made so thin that substantially no mechanical resistance is produced thereby-or they may be provided with links so that they cannot exert individual mechanical resistance responsive to the contact pressure produced thereon.
  • the invention may also be practiced so as to swing the contacts outwardly while they are under pressure because of the relatively low frictional components that may be considered in certain uses.
  • the arrangement may also be such that the contact pressure is produced by exerting a pull on the corresponding contacts as is diagrammatically indicated in Fig. 3.
  • the contact pressure of contacts K1 to K4 is produced by arranging the contacts serially along a common axis as in the other embodiments and exerting a pulling force effective in either one or in both directions Z1 and Z2.
  • One of the other of the points Z1 or Z2 may be stationary if the pulling force isapplied in only one direction.
  • a relay having a contact assembly comprising a plurality of circuit-controlling springs including respectively laterally relatively stationary and laterally relatively movable springs, each spring carrying at least one contact point for electrical contact-making engagement with a similar contact point carried by an adjacent spring, insulating members respectively disposed between springs controlling different circuits, said contact points and said insulating members extending along a common axis, means for applying a force which is operative in the direction of and applied along said common axis to produce contact pressurewhich is propagated through said insulating members along said axis from contact point to contact point included in said assembly, and means for laterally displacing said relatively movable springs with respect to said relatively stationary springs in a direction extending perpendicular to the direction of said force.
  • a relay having a contact assembly comprising a plurality of circuit-controlling springs including respectively laterally relatively stationary and laterally relatively movable springs, each spring carrying at least one contact point for electrical contact-making engagement with a similar contact point carried by an adjacent spring, insulating members respectively disposed between springs controlling different circuits, said contact points and said insulating members extending along a common axis, first control means for applying a force which is operative in the direction of and applied along said common axis to produce contact pressure which is propagated through said insulating members along said axis from contact point to contact point in said assembly, and second control means for laterally displacing said relatively movable springs with respect to said relatively stationary springs in a direction extending perpendicular to the direction of said force.
  • a relay having a contact assembly comprising a plurality of circuit-controlling springs including respectively laterally relatively stationary and laterally relatively movable springs, each spring carrying at least one contact point for electrical contact-making engagement with a similar contact point carried by an adjacent spring, insulating members respectively disposed between springs controlling different circuits, said contact points and said insulating members extending along a common axis, first electromagnetic control means for applying a force which is operative in the direction of and applied along said common axis to produce contact pressure which is pro-pagated through said insulating members along Said axis from contact point to contact point in said assembly, and
  • second electromagnetic control means for laterally displacing said relatively movable springs with respect to said relatively stationary springs in a direction extending perpendicular to the direction of said force.
  • a relay having a contact assembly comprising a plurality of circuit-controlling springs including respectively laterally relatively stationary and laterally relatively mov- 3 able springs, each spring carrying at least one contact point for electrical contact-making engagement with .a similar contact point carried by an adjacent spring, insulating members respectively disposed between springs controlling different circuits, said contact points and said insulating members extending along a common axis, first electromagnetic control means for applying a force which is operative in the direction of and applied along said common axis to produce contact pressure which is propagated through said insulating members along said axis from contact point to contact point in said assembly, and second means governed by said electromagnetic control means for laterally displacing said relatively movable springs with respect to said relatively stationary springs in a direction extending perpendicular to the direction of said force.
  • a relay having a contact assembly comprising a plurality of circuit-controlling springs including respectively laterally relatively movable springs and laterally relatively stationary springs, each spring carrying at least one contact point for electrical contact-making engagement with a similar contact point carried by an adjacent spring, insulating members respectively disposed between springs controlling different circuits, said contact points and said insulating members extending along a common axis, a rotatable and axially movably disposed operating member for mounting said laterally relatively movable springs, electromagnetic control means for axially moving said operating member to apply a force which is operative in the direction of and along said common axis to produce contact pressure which is propagated through said insulating members along said axis from contact point to contact point included in said assembly, and mechanical means effective upon release of said electromagnetic control means for axially moving said operating member in reverse direction and for rotating it to rotate said relatively movable springs so as to move the contact points carried thereby in a direction perpendicular to the direction of said force.
  • a relay having a contact assembly comprising a plurality of circuit-controlling springs including laterally relatively stationary and laterally relatively movable springs, each spring carrying at least one contact point for electrical contact-making engagement with a similar contact point carried by an adjacent spring, insulating members respectively carried by said relatively laterally stationary springs and respectively disposed between springs controlling different circuits, said contact points and said insulating members extending along a common axis, means for applying a force which is operative in the direction of and applied along said common axis to produce contact pressure which is propagated through said insulating members along said axis from contact point to contact point included in said assembly, and means effective after said force is relaxed to move said laterally relatively movable springs so as to displace the contact points carried thereby in a direction perpendicular to the direction of said force.
  • a relay having a contact assembly comprising a plurality of circuit-controlling springs including respectively laterally relatively stationary and laterally relatively movable springs, each spring carrying at least one contact point for electrical contact-making engagement with a similar contact point carried by an adjacent spring, insulating members respectively disposed between springs controlling different circuits, said contact points and said insulating members extending along a common axis,

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mechanisms For Operating Contacts (AREA)

Description

Dec. 16, 1958 w. SCHMITZ RELAY CONTACT ARRANGEMENT AND OPERATION Filed Feb. 28. 1955 Fig.
United States RELAY CONTACT ARRANGEMENT AND OPERATION Walter Schmitz, Frankfurt am Main, Germany, assignor to Siemens & Halske Aktiengesellschaft, Munich, Germany, a corporation of Germany This invention relates to relays, especially for use in railroad signal apparatus, and is particularly concerned with a contact arrangement resulting in improved and more efiicient operation of such relays.
The number of simultaneously energized relays, as they are, for example, used in railroad signal apparatus may require considerable energy. Efforts have therefore been made to build relays requiring relatively little current. Relays can be made more efiicient by employing small contact spring pressures and by making the operating stroke of contact spring pressures and by making the operating stroke of contact springs as small as possible. Various recently introduced contact materials also give favorable possibilities toward making the operation of relays more efficient. However, limits are nevertheless reached and further efforts at improved efficiency must seek improvements in different directions. Especially troublesome are the normal or break contacts, that is, the contacts which are closed in the deenergized condition of the relays. The required contact pressure must be supplied by spring or weight means and the corresponding force must be exerted over the entire switching path of the make contacts incident to the switching of the relay to energized position.
In accordance with the invention, the energy for producing the required contact pressure may be greatly reduced by arranging the contacts chainlike in mutually supporting series relationship so that the contact pressure is propagated from contact to contact. Insulating members may for this purpose be disposed between the individual contacts forming supports therefor. The opening of the individual contacts may be effected, for example, by first releasing the contact pressure and thereafter removing parts of the contact elements laterally, that is, in a direction perpendicular to the direction in which the contact pressure is exerted.
Examples of the invention will now be described with reference to the accompanying diagrammatic drawings, in which Fig. 1 shows in schematic manner an embodiment comprising a pair of magnets for respectively supplying the contact pressure and for effecting the relative displacement of certain contact elements.
Fig. 2 illustrates in like manner an embodiment comprising a single magnet for controlling both functions; and
Fig. 3 represents an embodiment in which the contact pressure is produced by exertin on the contacts a pulling force.
The embodiment according to Fig. 1 comprises springs carrying contact points indicated at 1 to 8. The contact points are in closed position disposed in pairs forming respectively coacting contacts. Each contact comprising two contact points is supported relative to the next successive contact by an insulating member such as the member 9 disposed between the contacts having the points and respectively. The insulating member extending from the spring carrying the contact point 1 is disposed underneath the pressure controlling magnet 10 having a pivoted armature with an extension which presses in attracted position upon the corresponding insulating member to press the coacting contacts downwardly against a stationary insulating member 12. Upon deenergization of the magnet 10, the pressure on the coacting contacts will be relieved and they will lie loosely in their respective positions. The disconnect control magnet 19 may now be energized to attract its armature 14 so as to-rotate the rod 15 about the pivot axis of the shaft 17 journalled at 16, thereby swinging the springs carrying the contact points 5 to 8 laterally outwardly away from the springs carrying the respective ly coacting contact points 1 to 4. Numeral 18 designates a spring for restoring the springs carrying the contact points 5 to 8, upon deenergization of the magnet 19, to their positions for coaction with the contact points 1 to 4.
In the embodiment shown in Fig. 2, there is provided a single magnet 16 having an armature 15 for performing the functions of the magnets 10 and 19 employed in Fig. l. The parts of the relay of the embodiment Fig. 2 are shown in operated position, the magnet 16 being assumed to be energized. The armature 15 is accordingly attracted. The rod 20 carrying the contact springs 542/21, 6a/22, 70/23, Sal/24 has been pulled down and the contact points carried by these springs are pressed against their coacting contact points carried by the springs 1a to 4a and 28 to 31. This pressure is propagated downwardly from contact to contact through the medium of insulating members carried by the intervening springs 6a/ 22, 7a/23, 8a/ 24. The contact points are thus held under the requisite pressure throughout their corresponding circuit closing operation. It is understood, of course, that the springs 1a to 4a and 28 to 31 may be connected by suitable means with desired, respectively associated circuits.
Upon deenergization of the magnet 16, the force of the spring 25 will be effective to raise the rod 20 and with it its contact springs 5a/21, 8a/24 and the contact pressure between the various contacts is thus immediately relieved. The force of the spring 18 linked to the lever 19 extending from the rod 20 will rotate such rod within its journals including the journal pin 17. The rod 26 carries a small roller 26 and such roller will ride upwardly along a stationary wedge-shaped camming member 27 thus raising the rod 20 and therewith the springs 5a/21 /24, thus further relieving the pressure on the various contacts. Upon further rotation of the rod 20, the springs 5a to So and 21 to 24 will be rotated laterally outwardly relative to their respectively cooperating springs 1a to 5:1 and 28 to 31 to open the circuits controlled thereby.
Energization of the magnet 16 and consequent attraction of the armature 15 exerts a downward pull on the rod 29. The roller 26 rides downwardly along the camming member 27. The rod 20 is thus rotated to insert the springs 511/21 841/24 again for coaction with the relatively stationary springs 1a to 4a and 28 to 31.
The arrangement according to Fig. 2 gives the known advantages of a two-pole circuit breaker.
In a structure provided with break contacts, the arrangement may be such that contact points on the springs such as the springs 5a to 8:1 and 21 to 24, respectively, face in their laterally retracted position other springs for coaction therewith. The guide roller may thereby cooperate with means in the terminal position thereof, for freeing a spring for actuation.
Instead of swinging certain contact springs laterally relative to stationary contact springs, as described with reference to Figs. 1 and 2, the insulating members shown, such as the members 9 in Fig. 1, may be wedge-shaped and secured on a common actuating member, and the latter may be rotated in the manner in which the springs are rotated in the illustrated examples, so as to move the insulating members relative to associated contact springs to effect the operation thereof either in closing or opening sense as desired.
In accordance with the invention, the contacts may be arranged arcuately about a fixed axis and dilferent levels may be utilized for contact operation.
The contact springs are either made so thin that substantially no mechanical resistance is produced thereby-or they may be provided with links so that they cannot exert individual mechanical resistance responsive to the contact pressure produced thereon.
The invention may also be practiced so as to swing the contacts outwardly while they are under pressure because of the relatively low frictional components that may be considered in certain uses.
The arrangement may also be such that the contact pressure is produced by exerting a pull on the corresponding contacts as is diagrammatically indicated in Fig. 3. The contact pressure of contacts K1 to K4 is produced by arranging the contacts serially along a common axis as in the other embodiments and exerting a pulling force effective in either one or in both directions Z1 and Z2. One of the other of the points Z1 or Z2 may be stationary if the pulling force isapplied in only one direction.
Changes may be made within the scope and spirit of the appended claims.
I claim:
1. A relay having a contact assembly comprising a plurality of circuit-controlling springs including respectively laterally relatively stationary and laterally relatively movable springs, each spring carrying at least one contact point for electrical contact-making engagement with a similar contact point carried by an adjacent spring, insulating members respectively disposed between springs controlling different circuits, said contact points and said insulating members extending along a common axis, means for applying a force which is operative in the direction of and applied along said common axis to produce contact pressurewhich is propagated through said insulating members along said axis from contact point to contact point included in said assembly, and means for laterally displacing said relatively movable springs with respect to said relatively stationary springs in a direction extending perpendicular to the direction of said force.
2. A relay having a contact assembly comprising a plurality of circuit-controlling springs including respectively laterally relatively stationary and laterally relatively movable springs, each spring carrying at least one contact point for electrical contact-making engagement with a similar contact point carried by an adjacent spring, insulating members respectively disposed between springs controlling different circuits, said contact points and said insulating members extending along a common axis, first control means for applying a force which is operative in the direction of and applied along said common axis to produce contact pressure which is propagated through said insulating members along said axis from contact point to contact point in said assembly, and second control means for laterally displacing said relatively movable springs with respect to said relatively stationary springs in a direction extending perpendicular to the direction of said force.
3. A relay having a contact assembly comprising a plurality of circuit-controlling springs including respectively laterally relatively stationary and laterally relatively movable springs, each spring carrying at least one contact point for electrical contact-making engagement with a similar contact point carried by an adjacent spring, insulating members respectively disposed between springs controlling different circuits, said contact points and said insulating members extending along a common axis, first electromagnetic control means for applying a force which is operative in the direction of and applied along said common axis to produce contact pressure which is pro-pagated through said insulating members along Said axis from contact point to contact point in said assembly, and
second electromagnetic control means for laterally displacing said relatively movable springs with respect to said relatively stationary springs in a direction extending perpendicular to the direction of said force.
4. A relay having a contact assembly comprising a plurality of circuit-controlling springs including respectively laterally relatively stationary and laterally relatively mov- 3 able springs, each spring carrying at least one contact point for electrical contact-making engagement with .a similar contact point carried by an adjacent spring, insulating members respectively disposed between springs controlling different circuits, said contact points and said insulating members extending along a common axis, first electromagnetic control means for applying a force which is operative in the direction of and applied along said common axis to produce contact pressure which is propagated through said insulating members along said axis from contact point to contact point in said assembly, and second means governed by said electromagnetic control means for laterally displacing said relatively movable springs with respect to said relatively stationary springs in a direction extending perpendicular to the direction of said force.
5. A relay having a contact assembly comprising a plurality of circuit-controlling springs including respectively laterally relatively movable springs and laterally relatively stationary springs, each spring carrying at least one contact point for electrical contact-making engagement with a similar contact point carried by an adjacent spring, insulating members respectively disposed between springs controlling different circuits, said contact points and said insulating members extending along a common axis, a rotatable and axially movably disposed operating member for mounting said laterally relatively movable springs, electromagnetic control means for axially moving said operating member to apply a force which is operative in the direction of and along said common axis to produce contact pressure which is propagated through said insulating members along said axis from contact point to contact point included in said assembly, and mechanical means effective upon release of said electromagnetic control means for axially moving said operating member in reverse direction and for rotating it to rotate said relatively movable springs so as to move the contact points carried thereby in a direction perpendicular to the direction of said force.
6. A relay having a contact assembly comprising a plurality of circuit-controlling springs including laterally relatively stationary and laterally relatively movable springs, each spring carrying at least one contact point for electrical contact-making engagement with a similar contact point carried by an adjacent spring, insulating members respectively carried by said relatively laterally stationary springs and respectively disposed between springs controlling different circuits, said contact points and said insulating members extending along a common axis, means for applying a force which is operative in the direction of and applied along said common axis to produce contact pressure which is propagated through said insulating members along said axis from contact point to contact point included in said assembly, and means effective after said force is relaxed to move said laterally relatively movable springs so as to displace the contact points carried thereby in a direction perpendicular to the direction of said force.
7. A relay having a contact assembly comprising a plurality of circuit-controlling springs including respectively laterally relatively stationary and laterally relatively movable springs, each spring carrying at least one contact point for electrical contact-making engagement with a similar contact point carried by an adjacent spring, insulating members respectively disposed between springs controlling different circuits, said contact points and said insulating members extending along a common axis,
means for exerting a pull on at least one of said springs, said pull producing a force which is operative in the direction of and applied along said common axis to produce contact pressure which is propagated through said insulating members along said axis from contact point to contact point included in said assembly, and means for laterally displacing said relatively movable springs with respect to said relatively stationary springs in a direction extending perpendicular to the direction of said force.
References Cited in the file of this patent UNITED STATES PATENTS 345,561 Wightman July 13, 1885 891,722 OBrien June 23, 1908 1,460,173 Patten June 26, 1923 6 Chandeysson Dec. 8, 1925 Austin Nov. 16, 1926 Wither Dec. 24, 1935 Winther Aug. 11, 1936 Sheatsley Jan. 5, 1937 Snavely Oct. 14, 1941 Miller Dec. 30, 1941 Vigren et al May 12, 1942 Whittaker Aug. 27, 1946 Miller Aug. 10, 1948 Mork Feb. 21, 1950 Diesen et a1 July 10, 1956 FOREIGN PATENTS Germany Feb. 17,- 1908 Switzerland Sept. 16, 1946 Great Britain Aug. 15, 1947
US491093A 1954-04-09 1955-02-28 Relay contact arrangement and operation Expired - Lifetime US2864913A (en)

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Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE195757C (en) *
US345561A (en) * 1886-07-13 Merle j
US891722A (en) * 1908-02-14 1908-06-23 Monitor Mfg Company Of Baltimore City Starter for electric motors.
US1460173A (en) * 1919-01-08 1923-06-26 Westinghouse Electric & Mfg Co Voltage-regulator mechanism
US1564938A (en) * 1922-04-29 1925-12-08 Marshall Electric Company Field regulator
US1606738A (en) * 1919-10-11 1926-11-16 Westinghouse Electric & Mfg Co Control apparatus
US2025487A (en) * 1934-08-23 1935-12-24 Winther Anthony Transmission control
US2050479A (en) * 1934-03-07 1936-08-11 Martin P Winther Contact bank
US2066491A (en) * 1935-11-08 1937-01-05 American Telephone & Telegraph Switch
US2259183A (en) * 1939-12-23 1941-10-14 Union Switch & Signal Co Electrical relay
US2268161A (en) * 1939-12-12 1941-12-30 Union Switch & Signal Co Switching device
US2282687A (en) * 1938-06-13 1942-05-12 Western Electric Co Set of contact springs for electrical switching apparatus
CH242241A (en) * 1945-03-08 1946-04-30 Stalder Frederic Relay-switch.
US2406449A (en) * 1944-06-29 1946-08-27 Westinghouse Electric Corp Switching apparatus
GB591384A (en) * 1944-05-09 1947-08-15 Landis & Gyr Sa Improvements relating to contact spring pile-ups for electromagnetic relays and other electric switches
US2446881A (en) * 1946-07-03 1948-08-10 Miller Edwin August Mechanism for power electrical tap switches
US2498569A (en) * 1948-11-26 1950-02-21 Baldwin Co Volume control switch and the like
US2754390A (en) * 1951-01-22 1956-07-10 Ericsson Telefon Ab L M Electromagnetic relay

Patent Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE195757C (en) *
US345561A (en) * 1886-07-13 Merle j
US891722A (en) * 1908-02-14 1908-06-23 Monitor Mfg Company Of Baltimore City Starter for electric motors.
US1460173A (en) * 1919-01-08 1923-06-26 Westinghouse Electric & Mfg Co Voltage-regulator mechanism
US1606738A (en) * 1919-10-11 1926-11-16 Westinghouse Electric & Mfg Co Control apparatus
US1564938A (en) * 1922-04-29 1925-12-08 Marshall Electric Company Field regulator
US2050479A (en) * 1934-03-07 1936-08-11 Martin P Winther Contact bank
US2025487A (en) * 1934-08-23 1935-12-24 Winther Anthony Transmission control
US2066491A (en) * 1935-11-08 1937-01-05 American Telephone & Telegraph Switch
US2282687A (en) * 1938-06-13 1942-05-12 Western Electric Co Set of contact springs for electrical switching apparatus
US2268161A (en) * 1939-12-12 1941-12-30 Union Switch & Signal Co Switching device
US2259183A (en) * 1939-12-23 1941-10-14 Union Switch & Signal Co Electrical relay
GB591384A (en) * 1944-05-09 1947-08-15 Landis & Gyr Sa Improvements relating to contact spring pile-ups for electromagnetic relays and other electric switches
US2406449A (en) * 1944-06-29 1946-08-27 Westinghouse Electric Corp Switching apparatus
CH242241A (en) * 1945-03-08 1946-04-30 Stalder Frederic Relay-switch.
US2446881A (en) * 1946-07-03 1948-08-10 Miller Edwin August Mechanism for power electrical tap switches
US2498569A (en) * 1948-11-26 1950-02-21 Baldwin Co Volume control switch and the like
US2754390A (en) * 1951-01-22 1956-07-10 Ericsson Telefon Ab L M Electromagnetic relay

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