US3271533A - Rotary switch, with vibration resistant resilient displaceable fixed contact structure - Google Patents

Rotary switch, with vibration resistant resilient displaceable fixed contact structure Download PDF

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US3271533A
US3271533A US319107A US31910763A US3271533A US 3271533 A US3271533 A US 3271533A US 319107 A US319107 A US 319107A US 31910763 A US31910763 A US 31910763A US 3271533 A US3271533 A US 3271533A
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contacts
contact
switch
moving
conductor
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US319107A
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Maurice C Butler
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Kinetics Corp
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Kinetics Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
    • H01H19/54—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand the operating part having at least five or an unspecified number of operative positions
    • H01H19/56—Angularly-movable actuating part carrying contacts, e.g. drum switch

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  • the present invention relates to a rotary electrical switch which is vibration resistant, has a long life, functions well in a dry state, passes a high electrical current and has characteristics which make it desirable for use in circuits which have inductive loads.
  • the switch of the present invention is comprised of moving and stationary contacts which contacts are arranged and formed in such a way as to give the abovedescribed characteristics.
  • the moving contacts rotate about an axis. As the moving contacts rotate, their outer tips define a circle. Each moving contact cooperates with one or more corresponding fixed contacts which are substantially tangent to the circle defined by the moving contact. However, the shortest distnace from the axis to the fixed contacts is less than the radius of the circle. Ordinarily, such a condition would prohibit the rotation of the moving contact. However, the fixed contacts are resiliently displaceable in a direction radial of the axis.
  • the switch Since the high contact force and the wiping action maintain a low electrical contact resistance, high switch temperatures are not produced. Therefore, since cooling liquids are not required, the switch may be operated in a dry state.
  • the switch of the present invention is very resistant to vibration. This resistance is due to three characteristics of the switch: The high contact force, the natural vibrational frequency of the contacts, and the positive contacting mechanism.
  • the high contact pressure between the moving and stationary contacts is produced by resilient displacement of the substantially fixed contact.
  • the contacts do not resonate.
  • the contacting portions of the switches must separate at a high relative velocity.
  • the contacts of this switch When used in conjunction with a Geneva drive system the contacts of this switch have a high make and break velocity.
  • the Geneva drive system rotates at a non-uniform rate.
  • the Geneva system could be so adjusted as to give the switch contacts a high relative velocity during the making and breaking of contact, and zero relative velocity during period when the contacts are in contact.
  • FIG. 1 is a perspective view of the moving contacts of one embodiment of the invention
  • FIG. 2 is a cross-sectional view of the embodiment of the invention which uses the moving contacts shown in.
  • FIG. 1 A first figure.
  • FIG. 3 is a fragmentary view of another embodiment of the contacts shown in FIG. 2, drawn at a larger scale;
  • FIG. 4 is a plan view of FIG. 3 taken along line 4-4 of FIG. 3;
  • FIG. 5 is a perspective view of the moving contacts of another embodiment of the invention.
  • FIG. 6 is a cross-sectional view of the embodiment of the invention which uses the moving contacts shown in FIG. 5;
  • FIG. 7 is a fragmentary view of the contacts shown in FIG. 5, drawn at a larger scale.
  • FIGS. 1, 2 and 3 illustrate one embodiment of the invention.
  • FIG. 1 shows the moving portion of the switch.
  • the moving electrical contacts 20 are held by the shaft 22.
  • the shaft may be either an electrical conductor or non-conductor, however, if made of a conductor, the moving contacts 20 must be insulated from the shaft 22.
  • FIG. 2 shows a cross-sectional view of the moving contacts 20 and the shaft 22 positioned within the switch.
  • Two of the resiliently displaceable substantially fixed contacts 26 are shown held in position by support means herein shown as the switch casing 28.
  • the casing may be made of either an electrical conductor or non-conductor, however, if rnade of a conductor, the fixed contacts 26 must be insulated from the casing 28.
  • Both ends of contacts 26 may be fixed to the casing, or one end may be fixed and the other end slidable relative to the casing. In the first case, both ends fixed, the resilient displacement of the contact requires a greater force than the second case of one end fixed and one end free.
  • the shaft 22 is held in place by bearings 24, which are mounted in the ends of the switch casing 28.
  • each of the fixed contacts 26, which are straight when not in contact with the moving contacts 20, is shown resiliently displaced by the moving contacts 20. This resilient displacement produces a high contact pressure between the cont-acts.
  • FIGS. 1 and 2 show moving contacts 20 which are continuous through the shaft 22.
  • one of the moving contacts combined with two of the stationary contacts comprises one switching circuit.
  • the moving contacts could be discontinuous through the shaft.
  • any one of the moving contacts 20 could be electrically interconnected to one or more of the other moving contacts 20.
  • the moving contacts 20 could be disposed at various locations on the shaft, each of these moving contacts 20 having one or more fixed contacts, variously disposed, with which to contact as it rotates on the shaft. This switch can therefore perform a complex switching sequence because of the variety of arrangements of the fixed and moving contacts and the variety of ways of electrically interconnecting the contacts.
  • FIGS. 1 and 2 has the moving contacts 20 disposed in two planes which are at right angles to one another. Therefore, the moving contacts in one plane break contact before the contacts in the other plane make contact. In this embodiment the circuit is broken at two places simultaneously. This double break characteristic reduces arc erosion, since the total are voltage drop is divided into two smaller voltage drops. The total are voltage drop of a conventional switch, single break, is made to occur at one place.
  • FIG. 3 is an expanded view of another embodiment of the contacts 20 and 26.
  • This embodiment utilizes 'bi-metallic contacts 20 and 26.
  • the leading and trailing portions of the contacts which are first and last to make contact, 30 and 32, are made of a material that is resistant to electric arc erosion, such as tungsten. Whereas the remaining portions of the contacts are made of a material which has a low electrical resistivity, such as copper.
  • the fixed contact width is greater than the width of the inserts 32 so as to provide a low electrical resistance path around the inserts 32.
  • FIGS. 5, 6 and 7 show another embodiment of the invention which uses cam-like moving contacts 34.
  • the cam-like moving contacts 34 are disposed along the shaft 36.
  • the moving contacts are insulated from the shaft and may or may not be insulated from one another.
  • FIG. 6 shows a cross-sectional view of the shaft 36, and one of the cam-like moving contacts 34 positioned within the switch. Two of the resiliently displaceable substantially fixed contacts 40 are shown held in position by the switch casing 42.
  • each of the fixed contacts 40 are shown resiliently displaced by one of the cam-like moving contacts, said displacement producing a contact pressure between the contacts.
  • the shaft 36 is held in place by bearings 38 mounted on the end of the switch casing 42.
  • the cam-like moving contact 34 includes a contacting surface 44 which has a constant radius of curvature with respect to the longitudinal axis of the switch.
  • the close circuit time for any one cam-like contact is dependent upon the circumferential length of the contact surface 44.
  • cam-like contacts 34 By selective electrical interconnection of cam-like contacts 34, by varying the circumferential lengths of the contacting surfaces 44, by varying the angular location of the contacting surfaces 44 relative to the longitudinal axis of the shaft 36, and by varying the rotational speed of the shaft, a great variety of complex switching operations can be accomplished by the switch.
  • the switchs versatility is further enhanced 'by the fact that the relative position of the fixed contacts for anyone cam-like contact 34, may be varied.
  • FIG. 7 shows an arc erosion prevention construction similar to the one shown in FIG. 3. Inserts 46 and 47 are made of an electrical conductor which is resistant to are erosion, whereas, the remaining portions of contacts 34 and 40 are made of a material having a low electrical resistivity such as copper.
  • a rotatable electrical switch comprising in combination:
  • a rotatable electrical switch comprising in combination:
  • a rotatable electrical switch comprising in combination:
  • a rotatable electrical switch comprising in combination:
  • a rotatable electrical switch comprising in combination:
  • a rotatable electrical switch comprising in combination:

Landscapes

  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)

Description

Sept. 6, 1966 BUTLER 3,271,533
ROTARY SWITCH WITH RATION RESISTANT RESILIENT DISPLACEABLE F D CONTACT STRUCTURE Filed 28, 1963 FIG. 4
FIG. 7
INVENTOR. MAURICE C. BUTLER Q JM A, p32 Ww, Ak
[MY 1T- ATTORNEYS United States Patent v 3,271,533 ROTARY SWITCH, WITH VIBRATION RESISTANT RESILIENT DISPLACEABLE FIXED CONTACT STRUCTURE Maurice C. Butler, San Diego, Calif., assignor to Kinetics Corporation, Solana Beach, Calif., a corporation of California Filed Oct. 28, 1963, Ser. No. 319,107 6 Claims. (Cl. 200-9) The present invention relates to a rotary electrical switch which is vibration resistant, has a long life, functions well in a dry state, passes a high electrical current and has characteristics which make it desirable for use in circuits which have inductive loads.
The switch of the present invention is comprised of moving and stationary contacts which contacts are arranged and formed in such a way as to give the abovedescribed characteristics.
The moving contacts rotate about an axis. As the moving contacts rotate, their outer tips define a circle. Each moving contact cooperates with one or more corresponding fixed contacts which are substantially tangent to the circle defined by the moving contact. However, the shortest distnace from the axis to the fixed contacts is less than the radius of the circle. Ordinarily, such a condition would prohibit the rotation of the moving contact. However, the fixed contacts are resiliently displaceable in a direction radial of the axis.
When a fixed contact is resiliently displaced by a moving contact, a force is developed between the moving and fixed contacts. The high contact pressure thus developed between the contacting surfaces reduces the electrical contact resistance, and therefore permits the passage of high electrical currents.
Electrical contact resistance which reduces the current carrying capacity of the switch, is increased by the formation of films, of compounds (e.g., oxides), and by the presence of extraneous matter. These films, compounds, and extraneous matter collections are continually removed by the wiping action of the contacting surface of the moving contact sliding over its corresponding fixed contacts. This wiping action therefore helps to maintain a low contact resistance and thus permits the passage of high electrical currents.
Since the high contact force and the wiping action maintain a low electrical contact resistance, high switch temperatures are not produced. Therefore, since cooling liquids are not required, the switch may be operated in a dry state.
The switch of the present invention is very resistant to vibration. This resistance is due to three characteristics of the switch: The high contact force, the natural vibrational frequency of the contacts, and the positive contacting mechanism.
As previously discussed, the high contact pressure between the moving and stationary contacts is produced by resilient displacement of the substantially fixed contact.
By making the contacts such that their natural vibrational frequencies are substantially different than the frequency of rotation of the movable contacts, the contacts do not resonate.
To avoid arc erosion of switches used in circuits having inductive loads, the contacting portions of the switches must separate at a high relative velocity. When used in conjunction with a Geneva drive system the contacts of this switch have a high make and break velocity. The Geneva drive system rotates at a non-uniform rate. The Geneva system could be so adjusted as to give the switch contacts a high relative velocity during the making and breaking of contact, and zero relative velocity during period when the contacts are in contact.
3,271,533 Patented Sept. 6, 1966 Other features and advantages of the present invention will be apparent from the following description, reference being made to the accompanying drawing wherein preferred embodiments of the invention are illustrated.
In the drawing:
FIG. 1 is a perspective view of the moving contacts of one embodiment of the invention;
FIG. 2 is a cross-sectional view of the embodiment of the invention which uses the moving contacts shown in.
FIG. 1;
FIG. 3 is a fragmentary view of another embodiment of the contacts shown in FIG. 2, drawn at a larger scale;
FIG. 4 is a plan view of FIG. 3 taken along line 4-4 of FIG. 3;
FIG. 5 is a perspective view of the moving contacts of another embodiment of the invention;
FIG. 6 is a cross-sectional view of the embodiment of the invention which uses the moving contacts shown in FIG. 5; and
FIG. 7 is a fragmentary view of the contacts shown in FIG. 5, drawn at a larger scale.
Referring in detail to the drawing, FIGS. 1, 2 and 3 illustrate one embodiment of the invention. FIG. 1 shows the moving portion of the switch. The moving electrical contacts 20 are held by the shaft 22. The shaft may be either an electrical conductor or non-conductor, however, if made of a conductor, the moving contacts 20 must be insulated from the shaft 22.
FIG. 2 shows a cross-sectional view of the moving contacts 20 and the shaft 22 positioned within the switch. Two of the resiliently displaceable substantially fixed contacts 26 are shown held in position by support means herein shown as the switch casing 28. The casing may be made of either an electrical conductor or non-conductor, however, if rnade of a conductor, the fixed contacts 26 must be insulated from the casing 28. Both ends of contacts 26 may be fixed to the casing, or one end may be fixed and the other end slidable relative to the casing. In the first case, both ends fixed, the resilient displacement of the contact requires a greater force than the second case of one end fixed and one end free. I
The shaft 22 is held in place by bearings 24, which are mounted in the ends of the switch casing 28.
In FIG. 2 each of the fixed contacts 26, which are straight when not in contact with the moving contacts 20, is shown resiliently displaced by the moving contacts 20. This resilient displacement produces a high contact pressure between the cont-acts.
FIGS. 1 and 2 show moving contacts 20 which are continuous through the shaft 22. Thus one of the moving contacts combined with two of the stationary contacts comprises one switching circuit. While this construction is used to disclose the invention, other constructions are obvious. For example, the moving contacts could be discontinuous through the shaft. Then any one of the moving contacts 20 could be electrically interconnected to one or more of the other moving contacts 20. In addition the moving contacts 20 could be disposed at various locations on the shaft, each of these moving contacts 20 having one or more fixed contacts, variously disposed, with which to contact as it rotates on the shaft. This switch can therefore perform a complex switching sequence because of the variety of arrangements of the fixed and moving contacts and the variety of ways of electrically interconnecting the contacts.
The embodiment of FIGS. 1 and 2 has the moving contacts 20 disposed in two planes which are at right angles to one another. Therefore, the moving contacts in one plane break contact before the contacts in the other plane make contact. In this embodiment the circuit is broken at two places simultaneously. This double break characteristic reduces arc erosion, since the total are voltage drop is divided into two smaller voltage drops. The total are voltage drop of a conventional switch, single break, is made to occur at one place.
FIG. 3 is an expanded view of another embodiment of the contacts 20 and 26. This embodiment utilizes ' bi-metallic contacts 20 and 26. The leading and trailing portions of the contacts which are first and last to make contact, 30 and 32, are made of a material that is resistant to electric arc erosion, such as tungsten. Whereas the remaining portions of the contacts are made of a material which has a low electrical resistivity, such as copper.
FIG. 4 is a top view of the =bi-metallic fixed contact 26. The fixed contact width is greater than the width of the inserts 32 so as to provide a low electrical resistance path around the inserts 32.
FIGS. 5, 6 and 7 show another embodiment of the invention which uses cam-like moving contacts 34.
In FIG. S'the cam-like moving contacts 34 are disposed along the shaft 36. The moving contacts are insulated from the shaft and may or may not be insulated from one another.
FIG. 6 shows a cross-sectional view of the shaft 36, and one of the cam-like moving contacts 34 positioned within the switch. Two of the resiliently displaceable substantially fixed contacts 40 are shown held in position by the switch casing 42.
In FIG. 6 each of the fixed contacts 40 are shown resiliently displaced by one of the cam-like moving contacts, said displacement producing a contact pressure between the contacts.
The shaft 36 is held in place by bearings 38 mounted on the end of the switch casing 42.
The cam-like moving contact 34 includes a contacting surface 44 which has a constant radius of curvature with respect to the longitudinal axis of the switch. When the shaft 36 revolves at a uniform rate, the close circuit time for any one cam-like contact is dependent upon the circumferential length of the contact surface 44.
By selective electrical interconnection of cam-like contacts 34, by varying the circumferential lengths of the contacting surfaces 44, by varying the angular location of the contacting surfaces 44 relative to the longitudinal axis of the shaft 36, and by varying the rotational speed of the shaft, a great variety of complex switching operations can be accomplished by the switch. The switchs versatility is further enhanced 'by the fact that the relative position of the fixed contacts for anyone cam-like contact 34, may be varied.
FIG. 7 shows an arc erosion prevention construction similar to the one shown in FIG. 3. Inserts 46 and 47 are made of an electrical conductor which is resistant to are erosion, whereas, the remaining portions of contacts 34 and 40 are made of a material having a low electrical resistivity such as copper.
By proper positioning of the contact surfaces 44, it is possible, assuming the necessary electrical interconnections are made, for one of the switches in a circuit to close before another one opens. This make before break feature reduces are erosion because before a switch breaks its load is partially transferred to another switch.
It is apparent from the above description that I have invented a versatile rotary electrical switch which is vibration resistant, has a long life, functions well in a dry state, passes a high current, and functions well in circuits with inductive loads.
While the forms of embodiment herein shown and described constitute preferred forms, it is understood that other forms may be adopted falling within the scope of the laims .that follow.
- 1. A rotatable electrical switch, comprising in combination:
( a rotatable element;
(B) a conductor carried by and extending radially of the axis of the element, said conductor having:
(l) a section having highly conductive characteristics;
(2) a leading section having relatively high resistance to electric arc characteristics;
(C) a yielding contact;
(D) and means for rotatably supporting the rotatable element and for fixedly supporting the yielding contact under tension constantly and spaced from said element and in a position to be engaged first by said leading section and thereafter by the first mentioned section of the conductor upon rotation of said element.
2. A rotatable electrical switch, comprising in combination:
(A) a rotatable element;
(B) a conductor carried by and extending radially of the axis of the element, said conductor having:
(1) a section having high conductive characteristics;
(2) a trailing section having relatively high resistance to electric arc characteristics;
(C) a yielding contact;
(D) and means for rotatably supporting the rotatable element and for fixedly supporting the yielding contact under tension constantly and spaced from said element and in a position to be engaged by said first mentioned section of the onductor, then by the trailing edge and thereafter to be disengaged from the trailing edge upon rotation of said element.
3. A rotatable electrical switch comprising in combination:
(A) a rotatable element;
(B) a conductor carried by and extending radially of the axis of the element, said conductor having:
(1) a section having high conductive characteristics;
(2) a leading section having relatively high resistance to electric arc characteristics;
(3) a trailing section having relatively high resistance to electric arc characteristics;
(C) a yielding contact;
(D) and means for rotatably supporting the rotatable element and for fixedly supporting the yielding contact under tension constantly and spaced from said element and in a position to be engaged sequentially by said leading section, then by the first mentioned section of the conductor, then by the trailing section and thereafter to be disengaged from the trailing edge upon rotation of said element.
4. A rotatable electrical switch comprising in combination:
(A) a rotatable element;
(B) a conductor carried by and extending radially of the axis of the element;
(C) a yielding contact, said contact having:
(1) a section having high conductive characteristics;
(2) a section, included in the surface of the first mentioned section, having relatively high resistance to electric arc characteristics;
(D) and means for rotatably supporting the rotatable element and for fixedly supporting the yielding contact under tension constantly and spaced from said element and in a position that the conductor engages the second mentioned section and thereafter the first mentioned section upon rotation of said element.
5. A rotatable electrical switch comprising in combination:
(A) a rotatable element;
(B) a conductor carried by and extending radially of the axis of the element;
(C) a yielding contact, said contact having:
(1) a section having high conductive characteristics;
(2) a section, included in the surface of the first mentioned section, having relatively high resistance to electric arc characteristics;
(D) and means for rotatablysupporting the rotatable element and for fixedly supporting the yielding contact under tension constantly and spaced from said element and in a position that the conductor engages the first mentioned section and thereafter the second mentioned section upon rotation of said element.
6. A rotatable electrical switch comprising in combination:
(A) a rotatable element;
(B) a conductor carried by and extending radially of the axis of the element;
(C) a yielding contact, said contact having:
(1) a section having high conductive characteristi-cs;
(2) a section, included in the surface of the first mentioned section, having relatively high resistance to electric arc characteristics;
(3) a second section, included in the surface of the first mentioned section, having characteristics which render it highly resistant to electric arcing;
(D) and means for rotatably supporting the rotatable element and for fixedly supporting the yielding contact under tension constantly and spaced from said element and in a position that the conductor sequentially engages the second mentioned section, the first mentioned section, the third mentioned section and thereafter disengages the contact from the third mentioned section upon rotation of said element.
References Cited by the Examiner UNITED STATES PATENTS 1,994,821 3/1935 Hunter 200-9 X 2,006,959 7/ 1935 Mack.
2,501,164 3/1950 Durst 200166 2,501,456 3/1950 Thias et a1.
2,503,888 4/1950 Schultz 200-8 X 2,518,030 8/1950 Kuperus 200-166 X 2,814,009 11/1957 Emley et al 200-8 X 3,019,323 1/ 196 2 Daniels 200155 ROBERT K. SCHAEFER, Primary Examiner.
KATHLEEN H. CLAFFY, ROBERT S. MACON,
Examiners.
J. R. SCOTT, Assistant Examiner.

Claims (1)

1. A ROTATABLE ELECTRICAL SWITCH, COMPRISING IN COMBINATION: (A) A ROTATABLE ELEMENT: (B) A CONDUCTOR CARRIED BY AND EXTENDING RADIALLY OF THE AXIS OF THE ELEMENT, SAID CONDUCTOR HAVING: (1) A SECTION HAVING HIGHLY CONDUCTIVE CHARACTERISTICS; (2) A LEADING SECTION HAVING RELATIVELY HIGH RESISTANCE TO ELECTRIC ARC CHARACTERISTICS; (C) A YIELDING CONTACT; (D) AND MEANS FOR ROTATABLY SUPPORTING THE ROTATABLE ELEMENT AND FOR FIXEDLY SUPPORTING THE YIELDING CONTACT UNDER TENSION CONSTANTLY AND SPACED FROM SAID
US319107A 1963-10-28 1963-10-28 Rotary switch, with vibration resistant resilient displaceable fixed contact structure Expired - Lifetime US3271533A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3666902A (en) * 1970-09-02 1972-05-30 Delta Electronics Inc Switch system
US3873794A (en) * 1973-04-20 1975-03-25 Kenneth Owen Radio frequency modular switch system
US4797794A (en) * 1987-08-12 1989-01-10 Gte Products Corporation Reflector lamp
US4926019A (en) * 1988-09-08 1990-05-15 Siemens Energy & Automation, Inc. Moving copper pivot
US5008502A (en) * 1989-02-03 1991-04-16 Kasam Nawaz I Power switching contactor
US20090190340A1 (en) * 2008-01-29 2009-07-30 Emissive Energy Corporation Flashlight with i/o bus bar
CH716764A1 (en) * 2019-11-04 2021-05-14 Favre Laurent Apparatus comprising a mechatronic device comprising a mechanical part for electrical connection / disconnection.

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1994821A (en) * 1932-10-03 1935-03-19 Cutler Hammer Inc Electric motor control apparatus
US2006959A (en) * 1935-07-02 Circuit breaker
US2501164A (en) * 1943-09-27 1950-03-21 Metals & Controls Corp Method of making electrical contacts
US2501456A (en) * 1948-06-05 1950-03-21 Standard Coil Prod Co Inc Switch structure
US2503888A (en) * 1949-01-21 1950-04-11 Mcgraw Electric Co Multiple step switch
US2518030A (en) * 1942-01-21 1950-08-08 Hartford Nat Bank & Trust Co Electrical contact device having resiliently mounted contact
US2814009A (en) * 1954-10-07 1957-11-19 Cutler Hammer Inc Speed control apparatus for induction motors
US3019323A (en) * 1960-03-21 1962-01-30 Telex Inc Electrical switch

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2006959A (en) * 1935-07-02 Circuit breaker
US1994821A (en) * 1932-10-03 1935-03-19 Cutler Hammer Inc Electric motor control apparatus
US2518030A (en) * 1942-01-21 1950-08-08 Hartford Nat Bank & Trust Co Electrical contact device having resiliently mounted contact
US2501164A (en) * 1943-09-27 1950-03-21 Metals & Controls Corp Method of making electrical contacts
US2501456A (en) * 1948-06-05 1950-03-21 Standard Coil Prod Co Inc Switch structure
US2503888A (en) * 1949-01-21 1950-04-11 Mcgraw Electric Co Multiple step switch
US2814009A (en) * 1954-10-07 1957-11-19 Cutler Hammer Inc Speed control apparatus for induction motors
US3019323A (en) * 1960-03-21 1962-01-30 Telex Inc Electrical switch

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3666902A (en) * 1970-09-02 1972-05-30 Delta Electronics Inc Switch system
US3873794A (en) * 1973-04-20 1975-03-25 Kenneth Owen Radio frequency modular switch system
US4797794A (en) * 1987-08-12 1989-01-10 Gte Products Corporation Reflector lamp
US4926019A (en) * 1988-09-08 1990-05-15 Siemens Energy & Automation, Inc. Moving copper pivot
US5008502A (en) * 1989-02-03 1991-04-16 Kasam Nawaz I Power switching contactor
US20090190340A1 (en) * 2008-01-29 2009-07-30 Emissive Energy Corporation Flashlight with i/o bus bar
CH716764A1 (en) * 2019-11-04 2021-05-14 Favre Laurent Apparatus comprising a mechatronic device comprising a mechanical part for electrical connection / disconnection.

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