US2807684A - Reversing switch - Google Patents

Reversing switch Download PDF

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Publication number
US2807684A
US2807684A US532816A US53281655A US2807684A US 2807684 A US2807684 A US 2807684A US 532816 A US532816 A US 532816A US 53281655 A US53281655 A US 53281655A US 2807684 A US2807684 A US 2807684A
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US
United States
Prior art keywords
switch
operating
contact
elements
blade
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US532816A
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English (en)
Inventor
Edgar H Ayers
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Doosan Bobcat North America Inc
Original Assignee
Clark Equipment Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BE550863D priority Critical patent/BE550863A/xx
Application filed by Clark Equipment Co filed Critical Clark Equipment Co
Priority to US532816A priority patent/US2807684A/en
Priority to GB26988/56A priority patent/GB799649A/en
Priority to FR1156278D priority patent/FR1156278A/fr
Priority to DEC13621A priority patent/DE1130031B/de
Application granted granted Critical
Publication of US2807684A publication Critical patent/US2807684A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H21/00—Switches operated by an operating part in the form of a pivotable member acted upon directly by a solid body, e.g. by a hand
    • H01H21/54—Lever switches with blade-type contact co-operating with one or two spring-clip contacts, e.g. knife switch
    • H01H21/58—Change-over switches without stable intermediate position
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18856—Oscillating to oscillating
    • Y10T74/18864—Snap action

Definitions

  • This invention relates to electrical switches, and has to do with a reversing switch for use in starting, stopping and reversing the direction of drive of direct current electric motors.
  • My invention is directed to a reversing switch which is of simple construction and operation and may be produced at comparatively low cost and assures definite pressure contact between the contact elements while avoiding arcing therebetween.
  • the switch of my invention has a snap action and assures quick opening and closing of the contact elements regardless of the speed of movement of the operating lever.
  • the switch of my invention comprises a pair of toggle actuated switch mechanisms which are spring biased to either open or closed switch positions, substantially according to conventional practice.
  • a common actuator means is disposed and associated with such toggle mechanisms to alternately operate the same.
  • Ar-v rangement between the common actuator and each toggle mechanism includes means whereby the actuator is afforded a neutral operating zone, in which neither toggle mechanism is actuated thereby. Arrangement is further made so that movement of the actuator beyond either limit of its neutral operating zone causes positive actuation of one of the toggle mechanisms.
  • Such a switch is ideal for a motor reversing function; since to reverse the switch, it is necessary to first move the actuator through its neutral zone in which the switch and motor are deenergized. Thus, a motor coupled to a switch of this character is fully protected for reverse operation.
  • the main object of my invention is to provide a new and improved switching device in which toggle actuated switch blades which do not have a stable, neutral switch position are associated in combination with a common actuator means in a manner to provide a toggle actuated switch mechanism having a defined neutral operating position.
  • Another object of my present invention is to provide a new and improved toggle actuated switch mechanism having a stable neutral operating zone.
  • a still further object of my invention is to provide a new and improved reversing switch employing toggle actuated switch blades associated with a common actuator by means whereby a switch assembly producing alternate operation of switch blades after movement of the actuator through limits of its neutral operating zone is provided.
  • Still another object of my invention is to provide a new and improved switch mechanism embodying tog- 2,807,684 Patented Sept. 24, 1957 gle actuated switch blades in which means are provided to produce a stable, neutral operating condition for the switch assembly.
  • a still additional object of my invention is to provide a meant for disassociating welded contacts in a switch as aforesaid.
  • Figure l is a plan view of a switch embodying my invention with the parts in the positions which they occupy when the switch is open;
  • FIG. 2 is a side view of the switch of Figure 1;
  • Figure 3 is a view similar to Figure 1 but with the switch operating lever turned to a position in which certain of the contact elements are closed;
  • Figure 4 is a sectional view taken substantially on line 4-4 of Figure 2 but with the parts in the positions shown in Figure 3;
  • Figures 5, 6 and 7 are diagrammatic views showing the positions of the parts respectively corresponding to the several different positions to which the operating lever may be moved.
  • the switch comprises a rectangular base plate 10 of suitable material and conductor strips 11 and 12, formed of copper and of substantial thickness, secured on the upper face of base plate 10 along each side thereof.
  • the strips 11 and 12 are of elongated U-shape providing, at the ends of strip 11, upwardly extending arms 13 and at the ends of strip 12 upwardly extending arms 14.
  • Contact elements or buttons 15 are mounted on the inner faces of arms 13 of strip 11 and similar but-,
  • tons 16 are mounted on the inner faces of arms 14 of strip 12.
  • Switch blades 17 and 18 are pivotally mounted adjacent each end of base plate 10 on pivot rods 19secured through base plate 10 and passing through a steel reinforcing strip 20 at the under face of base plate 10, rods 19 being electrically insulated from strip 20 in a suitable known manner.
  • Each of the blades 17 and 18 has secured thereto, at its midlength, a substantially U- shaped stirrup 21 extending outwardly beyond the associated switch blade and receiving the rod 19 for pivoting the switch blade thereon.
  • the lower arm of stirrup 21 seats upon the upper end of a sleeve 22 seating at its lower end on base plate 10 and spacing the switch blade an appropriate distance above the base plate.
  • Each of the stirrups 21 is provided with an inward extension or finger 23 for a purpose to be described presently.
  • a binding post 24 is secured through base plate 10 adjacent each end thereof and is connected, by a braided flexible lead 25 to the adjacent Switchblade 17 or 18.
  • Each of the switch blades 17 and 18 is provided, at each end thereof, with a contact button, blade 17 carrying buttons 26 and 27 which cooperate with contact buttons 16 and 15, respectively, adjacent thereto, and blade 18 carrying buttons 28 and 29 which cooperate with buttons 16 and 15, respectively, adjacent thereto.
  • a switch operating lever 32 formed of suitable electrical insulating material, is pivotally mounted on a pivot rod 33 secured through reinforcing strip 20 and base plate 10 centrally thereof, rod 33 preferably being at the midlength of lever 32.
  • the lever 32 is of generally H-shape in side view and comprises an upper handle 34 with a downwardly extending neck 35 from the lower end of which extend two arms 36 disposed in underlying parallel relation to handle 34 sides of neck 35.
  • Each of the switch blades 17 and 18 has secured to its midportion a toggle arm 39 extending inwardly toward neck 35 of lever 32 and provided at its inner end with a notch 40 of substantial width.
  • the notch 40 receives the bight portion 41 of a U-shaped toggle member 42 the upper arm of which overlies toggle arm 39 in proximity thereto.
  • the arms of toggle member 42 are provided at their outer ends with upwardly and downwardly directed fingers '43 and 44, respectively, finger 43 being pivoted in handle 34 of operating lever 32 and finger 44 being pivoted 'in the corresponding arm 36 of lever 32.
  • a tension spring 45 is anchored at its inner end to a suitably recessed element-of bight 41 of toggle member 42, and is anchored at its outerend'to finger 23 of stirrup 21-on the adjacent switch blade.
  • An elongated-stud 47 is secured to the switch'blade 17 adjacent'contac't button 26 thereof and a similar stud 48 is secured to switch blade 18 adjacent the contact button 28 thereof, the studs "47 and '48 extending .inwardly'from the switch blades.
  • a pressure applying block 49 is 'secured to one side of :switch operating lever 32 centrally thereof and projects toward the studs '47 and 48 for cooperation therewith in a manner and for alpurpose to be described later.
  • a binding post 52 is secured through base plate and conductor strip 11 and is provided with an annular flange 53 seating on theupper face of strip 11.
  • Asimilar .binding post 54 is secured through base plate 10 and conductor strip 12 and is provided with an annular flange 55 seating on the upper face-of conductor strip 12.
  • bothof the tension springs 45 are in over center position and have swiing'the'toggle members 42 toward" the conductor strip 12 thereby turning the switch blades 17 and 18 counterclockwise and'clockwise, respectively, so as to move .the contact buttons 26 and 28 thereof into contact with the 'buttons16 with a snap action.
  • the bight portions 41 of the toggle membe'rs 42 are held in pressure contact with the arms 39 at the upper sidesof'the slots or notches 40 thereof,'and the tension springs 45 maintain pressure contactbe-tween the buttons 26 and 28 and the buttons 16.
  • The'buttons 27 and 29 are then in open circuit position spaced away from the buttons of the conductor strip 11,- this opening the power circuit and stopping the motor.
  • switch blade 17 By turning the switch operating lever 32 counterclockwise from its position of Figure 3 to its position of Figure l, the switch blade 17 is returned to its position shown in Figure 1 thus opening the circuit and stopping the motor. If the switch operating lever 32 is turned in counterclockwise direction beyond its neutral position shown in Figure 1, switch blade 18 is turned counterclockwise with a snap action, in the same manner in which the switch blade 17 was turned clockwise, opening the contact buttons 28 and 16 and closing the contact buttons 29 and 15. The switch blade 17 then remains in its position shown in Figures 1 and 5 and the switch blade 18 is in its position shown in Figure 5.
  • Thecurrent then flows from one side of the power source through conductor strip 11, contact buttons 29 and 15, switch blade 18 and through the field winding of the motor and then through blade 17, contact buttons 26 and .16 and conductor strip 12 to one side of the motor armature, and from the other side of the motor armature to the other side of the power source. That reverses the direction of flow of current through the motor field winding and the motor is then driven in the opposite direction to that which it wasdriven when the contact buttons 27 and 15 were closed. 'By turning the switch operating lever 32 counterclockwise to its neutral position, the switch is opened and-the motor is stopped in the same manner as before.
  • the switch operating lever 32 may be turned in either direction, to an extent limited by the stops 46 in cooperation with arms 36, to an operating position.
  • the switch blades 17 and 18 are rocked successively in one direction and in opposite relation and when lever 32 is turned in the opposite direction to its other operating position, switch blades 17 and 18 are successively rocked in the other direction and in opposite relation.
  • the power contact buttons 27 and 29 carried by the blades 17 and 18 are in open position, spaced away from the power contact buttons 15.
  • a motor reversing switch two sets of contact elements, each set comprising a first pair of elements and a cooperating second pair of elements movable alternately into and out of contact with said first elements respectively, a switch operating member having a neutral switch opening position and movable in opposite directions therefrom to a first operating position and a second operating position, and operating connections between said operating member and said second pairs of elements respectively comprising snap action means effective for successively actuating said second pairs of movable elements respectively in opposite relation responsive to movement of said operating member from its first operating position to its second operating position, said operating connections being so constructed that the second pair of elements of one set of contact elements remains in a first contact engaging position while the second pair of elements of the other set of contact elements moves from a corresponding first contact engaging position to a second such position and vice versa.
  • a motor reversing switch two sets of contact elements, each set comprising a first pair of elements and a cooperating second pair of elements movable alternately into and out of contact with said first elements respectively, a switch operating member having a neutral switch operating position and movable therefrom to a first switch operating position and a second switch operating position, and operating connections between said operating member and each of said second pairs of movable elements respectively comprising snap action means effective for successively actuating said second pairs of movable elements respectively in opposite relation responsive to movement of said operating member from its first operating position to its second operating position and for selectively actuating said second pair of movable elements of either set of contact elements independently of the other pair thereof to achieve said neutral position and either of said operating positions for the switch, as selected.
  • a motor reversing switch two sets of contact elements, each set comprising a pair of stationary elements and a cooperating pair of elements movable alternately into and out of contact with said stationary elements, a switch operating member having a neutral switch operating zone and movable therefrom in one direction to a first operating position and in an opposite direction to a second operating position, and connection means between said operating member and each pair of said movable elements comprising snap action means for actuating 6 either of said pairs of movable elements, one at a time, in response to movement of said operating member from one of its said operating positions into its neutral operating zone.
  • a motor reversing switch two sets of contact elements, each set comprising a pair of stationary elements and a cooperating pair of elements movable alternately into and out of contact with said stationary elements respectively, a switch operating member having a neutral switch operating zone and movable therefrom in one direction to a first operating position and in the opposite direction to a second operating position, and operating connections between said operating member and said pairs of movable elements respectively comprising over center snap action spring toggle means for actuating each of said pairs of movable elements as selected in response to movement of said operating member from one operating position to its neutral operating zone, movement of said operating lever between the limits of its neutral zone actuating said operating connection without actuating the pairs of movable elements.
  • a switch blade rockably mounted adjacent each pair of contact elements, two contact elements carried by said switch blade alternately movable into and out of contact with said fixed contact elements by rocking of said blade in opposite directions, a switch operating member having a neutral switch operating zone and movable therefrom in one direction to a first operating position and in the opposite direction to a second operating position, and operating connections between said operating member and each of said blades comprising snap action means efiective for rocking said blades successively in alternately opposite relation responsive to alternate movement of said operating member from its said neutral zone into either its said first and second operating positions and vice versa, the said switch blades being held in a contact engaging position with positive pressure throughout the movement of said operating member, in its said neutral zone.
  • a switch blade rockably mounted adjacent each pair of contact elements, two contact elements carried by each switch blade alternately movable into and out of contact with corresponding members of an associated pair of said fixed contact elements by rocking of said blade in opposite directions, a switch operating member having a neutral switch operating zone and movable therefrom in one direction to a first operating position and in the opposite direction to a second operating position, and operating connections between said operating member and said blades respectively comprising snap action means including spring means effective for rocking said blades to bring said contacts thereon into engagement with alternate fixed contact elements in response to movement of said operating member from its neutral operating zone into either of its operating positions, the said operating connections requiring the movement of said operating member into one of its operating positions before responsive actuation of a related switch blade, whereby said spring means serves to hold the engaged contact elements of said related switch blade in positive engagement with a corresponding fixed contact element during movement of said operating member in its said neutral operating zone.
  • a motor reversing switch two pairs of fixed contact elements, a switch blade rockably mounted adjacent each pair-of contact elements, two contact elements carried by said'switch blade alternately movable into and out of contact with said fixed contact elements by rocking of said blade in opposite directions, a switch operating lever pivoted between said blades for turning movement in opposite directions to two operating positions and an intermediate neutral switch opening position, snap action toggle connections between said lever and said blades efiective for rocking said blades successively in alternately opposite relation responsive to turning of said lever from one operating position to its other operating position and vice versa, and means actuated by said operating lever for exerting positive pressure on either of said switch blades for disengaging either of said contact elements thereon from one of said fixed contact elements.
  • a switch operating lever pivoted between said blades for limited turning movement in opposite directions to two operating positions and through a neutral switch opening position, toggle arms secured to the midportions of said blades and extending therefrom inwardly toward said lever, said arms having openings of substantial width in their inner ends, toggle members pivoted at their outer ends on said lever with their inner ends extending through said openings and of small cross area relative thereto, and over center tension springs anchored to said blades and to the inner ends of said toggle members for turning the latter in opposite directions with a snap action when the outer ends of said toggle members pass over center relative to said springs in the turning of said lever to either of its operating positions from its said neutral position.
  • a switch operating lever pivoted between said blades for limited turning movement in opposite directions through a neutral operating position to two operating positions, toggle arms secured to the midportions of said blades and extending therefrom inwardly toward said lever, said arms having openings of substantial width in their inner ends, toggle members pivoted at their outer ends on said lever with their inner ends extending through said openings and of small cross area relative thereto, over center tension springs anchored to said blades and to the inner ends of said toggle members for turning the latter in opposite directions with a snap action when the outer ends of said toggle members pass over center relative to said springs in the turning ofsaid lever to either of its operating positions, saidlever having a projection at one side thereof, and studs secured to said blades and extending inwardly toward saidpro
  • a switch operating member having a neutral switch opening position and pivotally movable therefrom in one direction to a first operatingposition and in the opposite direction to a second operating position means limiting pivotal movement of said operating memberin .said first and second directions, operating connections between said operating member and said blades respectively comprising snap action meansefiective for rocking said blades successively in alternately opposite directions responsive to movement of said operating'member from one operating position to its other operating position and vice versa,
  • first and second pairs of spaced stationary contacts first and second pairs of spaced movable contacts, two switch blades pivotally mounted one adjacent and extending between the mem bers of each pair of stationary contacts, each of said blades carrying a pair of said movable contacts, pivotal movement ,of each switch blade toward either member of thepair of stationary contacts adjacent thereto serving to bring one movable contact into engagement with such member
  • a pair of spring biased means operable to pivotally actuate each switch blade independently with snap action toward alternate members of the adjacent pair of stationary contacts as selected
  • rotatable operating means for actuating said spring biased means to effect sequential pivotal movement of said two switch blades in like rotational directions in response to rotation of said operating means
  • connection means providing lost motion association between said .operating means and each of said two spring biased means whereby said operating means is rotatable through a non-operating zone intermediate its zones for operating said spring biased means.
  • a motor reversing switch two sets of contact elements each set comprising a first pair of elements and a cooperating second pairof elements movable alternately into and out of contact with said first elements respectively, aswitch operating member having a neutral switch opening position and movable in opposite directions therefrom to a first operating position and a second operating position, operating connection means between said operating member and each of said second pairs of elements comprising snap action means effective for successively actuating said second pairs of movable elements in opposite relation responsive to movement of said operating member from its first operating position to its second operating position, said connection means being so constructed that the second pair of elements of each setof contact elements remains in a first position while the second pair of elements of the other set of contact elements moves from a corresponding first position to a second position and vice versa, and means actuated by said operating member for exerting positive pressure upon either pair ,of movable elements to move the same independently of said connection means from a position wherein one of said movable elements is engaged with one of saidfirst elements.

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  • Tumbler Switches (AREA)
  • Motor And Converter Starters (AREA)
US532816A 1955-09-07 1955-09-07 Reversing switch Expired - Lifetime US2807684A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE550863D BE550863A (enrdf_load_html_response) 1955-09-07
US532816A US2807684A (en) 1955-09-07 1955-09-07 Reversing switch
GB26988/56A GB799649A (en) 1955-09-07 1956-09-04 Improvements in or relating to motor reversing switch
FR1156278D FR1156278A (fr) 1955-09-07 1956-09-04 Commutateur-inverseur
DEC13621A DE1130031B (de) 1955-09-07 1956-09-05 Umschalter, insbesondere zweipoliger Umschalter fuer einen Gleichstrommotor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US532816A US2807684A (en) 1955-09-07 1955-09-07 Reversing switch

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US2807684A true US2807684A (en) 1957-09-24

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Application Number Title Priority Date Filing Date
US532816A Expired - Lifetime US2807684A (en) 1955-09-07 1955-09-07 Reversing switch

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US (1) US2807684A (enrdf_load_html_response)
BE (1) BE550863A (enrdf_load_html_response)
DE (1) DE1130031B (enrdf_load_html_response)
FR (1) FR1156278A (enrdf_load_html_response)
GB (1) GB799649A (enrdf_load_html_response)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2847541A (en) * 1955-10-24 1958-08-12 Gen Electric Double break liquid blast contactor
US3112380A (en) * 1959-12-30 1963-11-26 Clark Equipment Co Electric reversing switch mechanism with mechanical interlock
US3246100A (en) * 1962-12-05 1966-04-12 Raymond G Russell Load transfer switch mechanism
US4181825A (en) * 1978-06-05 1980-01-01 General Motors Corporation Electric switch for motor reversing
US4565906A (en) * 1985-01-30 1986-01-21 Clegg John E Reciprocating reverse-circuit switch
US4678871A (en) * 1985-07-22 1987-07-07 Skil Corporation Reversing switch for rechargeable hand tool
US5552754A (en) * 1995-06-05 1996-09-03 Onan Corporation Catch for electrical contact utilizing electromagnetic forces
US5638948A (en) * 1995-06-05 1997-06-17 Onan Corporation Electric transfer switch having three-position toggle mechanism
US5815058A (en) * 1997-04-02 1998-09-29 Onan Corporation Contact enhancement apparatus for an electric switch
US7268308B1 (en) 2004-12-06 2007-09-11 Willie Sam Caudill Isolation switch for power transfer
US20080185270A1 (en) * 2007-02-02 2008-08-07 Sebastien Arcand Reversing switch
US8803369B1 (en) 2010-01-06 2014-08-12 Willie Sam Caudill Automatic isolation switch for power transfer with emergency isolation control
US11009849B1 (en) 2018-03-06 2021-05-18 Willie Sam Caudill Meter hub safety isolation service entrance disconnect switch

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US365585A (en) * 1887-06-28 Electrical contact-changer
US707843A (en) * 1901-12-11 1902-08-26 Teter Heany Developing Company Electric switch or cut-out.
US1293532A (en) * 1916-09-25 1919-02-04 James B Wilson Controlling means for electric motors.
US1474013A (en) * 1918-09-13 1923-11-13 Benjamin Electric Mfg Co Electric switch
US1753975A (en) * 1927-03-02 1930-04-08 John T Welsh Control apparatus
US2289882A (en) * 1941-06-12 1942-07-14 John W Myers Temperature control system
GB551221A (en) * 1941-09-23 1943-02-12 Telephone Mfg Co Ltd Improvements in and relating to tumbler switches
US2448444A (en) * 1945-09-13 1948-08-31 Cutler Hammer Inc Electric switch
US2483122A (en) * 1946-02-19 1949-09-27 Gen Electric Circuit controlling device
US2641663A (en) * 1949-07-28 1953-06-09 Cutler Hammer Inc Electric switch

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE217391C (enrdf_load_html_response) *
DE684247C (de) * 1935-05-23 1939-11-25 Siemens Schuckertwerke Akt Ges Einrichtung zum Verhueten von Kontaktprellungen bei unter Wirkung einer Kippfeder stehenden Schaltgliedern von elektrischen Schaltern, insbesondere fuer Regeltransformatoren

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US365585A (en) * 1887-06-28 Electrical contact-changer
US707843A (en) * 1901-12-11 1902-08-26 Teter Heany Developing Company Electric switch or cut-out.
US1293532A (en) * 1916-09-25 1919-02-04 James B Wilson Controlling means for electric motors.
US1474013A (en) * 1918-09-13 1923-11-13 Benjamin Electric Mfg Co Electric switch
US1753975A (en) * 1927-03-02 1930-04-08 John T Welsh Control apparatus
US2289882A (en) * 1941-06-12 1942-07-14 John W Myers Temperature control system
GB551221A (en) * 1941-09-23 1943-02-12 Telephone Mfg Co Ltd Improvements in and relating to tumbler switches
US2448444A (en) * 1945-09-13 1948-08-31 Cutler Hammer Inc Electric switch
US2483122A (en) * 1946-02-19 1949-09-27 Gen Electric Circuit controlling device
US2641663A (en) * 1949-07-28 1953-06-09 Cutler Hammer Inc Electric switch

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2847541A (en) * 1955-10-24 1958-08-12 Gen Electric Double break liquid blast contactor
US3112380A (en) * 1959-12-30 1963-11-26 Clark Equipment Co Electric reversing switch mechanism with mechanical interlock
US3246100A (en) * 1962-12-05 1966-04-12 Raymond G Russell Load transfer switch mechanism
US4181825A (en) * 1978-06-05 1980-01-01 General Motors Corporation Electric switch for motor reversing
US4565906A (en) * 1985-01-30 1986-01-21 Clegg John E Reciprocating reverse-circuit switch
US4678871A (en) * 1985-07-22 1987-07-07 Skil Corporation Reversing switch for rechargeable hand tool
US5552754A (en) * 1995-06-05 1996-09-03 Onan Corporation Catch for electrical contact utilizing electromagnetic forces
US5638948A (en) * 1995-06-05 1997-06-17 Onan Corporation Electric transfer switch having three-position toggle mechanism
US5815058A (en) * 1997-04-02 1998-09-29 Onan Corporation Contact enhancement apparatus for an electric switch
US7268308B1 (en) 2004-12-06 2007-09-11 Willie Sam Caudill Isolation switch for power transfer
US20080185270A1 (en) * 2007-02-02 2008-08-07 Sebastien Arcand Reversing switch
US7855344B2 (en) * 2007-02-02 2010-12-21 Andritz Technology And Asset Management Gmbh Reversing switch
US8803369B1 (en) 2010-01-06 2014-08-12 Willie Sam Caudill Automatic isolation switch for power transfer with emergency isolation control
US11009849B1 (en) 2018-03-06 2021-05-18 Willie Sam Caudill Meter hub safety isolation service entrance disconnect switch

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Publication number Publication date
DE1130031B (de) 1962-05-24
BE550863A (enrdf_load_html_response)
GB799649A (en) 1958-08-13
FR1156278A (fr) 1958-05-14

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