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US2979592A - Cam operated contactors - Google Patents

Cam operated contactors Download PDF

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Publication number
US2979592A
US2979592A US791769A US79176959A US2979592A US 2979592 A US2979592 A US 2979592A US 791769 A US791769 A US 791769A US 79176959 A US79176959 A US 79176959A US 2979592 A US2979592 A US 2979592A
Authority
US
United States
Prior art keywords
lever
cam
contact
spring
levers
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
US791769A
Other languages
English (en)
Inventor
Watson John Ansley
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co Ltd
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
Application filed by British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Application granted granted Critical
Publication of US2979592A publication Critical patent/US2979592A/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
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/22—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact
    • H01H1/221—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member
    • H01H1/225—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member the supporting member being pivotable
    • 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
    • H01H19/60—Angularly-movable actuating part carrying no contacts
    • H01H19/62—Contacts actuated by radial cams

Definitions

  • This invention relates to cam operated contact arrangements, such as used in contactors of the kind having a movable contact acted upon in response to the cents to perform two movements, one for engaging anddisengaging a fixed contact, and one for causing a wiping action between the contacts while they engage each other.
  • the invention aims at an improved construction WhlCh affords a separate and more accurate control of each one of the abovementioned two movements, and also permits use of a lower cam shaft torque than required for closing comparable contactors, of conventional construction, in which the biasing force to be overcome by the cam shaft torque is of considerable magnitude and much greater than necessary to overcome a spring force provided for the wiping operation.
  • the present invention aims at reducing this counterforce, to reduce the maximum torque required from a cam shaft which is rotated for contact operation.
  • Fig. 1 is an elevation of one embodiment
  • Fig. 2 is a side view in the direction of the arrow r of Fig. 1 to show an axial displacement of the two actuating members which comprise rollers;
  • Fig. 3 shows in another embodiment the two actuating members carried on a common lever and biased by an additional spring means to eliminate back-lash in relation to the cam means.
  • a contact 1 is electrically insulated and mounted on a fixed structure 2 using means known in the art.
  • Another contact 3 shown in its open position is arranged to engage contact 1 when moved downwards and also to carry out a wiping movement substantially at right angles to the first movement.
  • the contact 3 is mounted on a lever 4 pivoted at 5 to a lever 6 which carries an actuating roller 7 for co-operation with a cam surface (not shown).
  • a compression spring 8 is arranged between the levers 4, 6 and it will be understood "ice that contact 3 will carry out a movement having a component at right angles'to the opening and closing movement, when the two contacts 1, 3 engages each other, and the roller 7 is movedin accordance with the shape of the cam surface thereby displacing lever 6 relative to lever 4 and compressing spring 8.
  • the rotation of lever 4 under the force of spring 8 is limited by a stop 13.
  • lever 10 Another actuating roller 9 is carried at the end of lever 10.
  • the two levers 6, 10 are rotatable about a common pivot 11 and are secured together by a resilient member indicated at 12.
  • This member can be of a known construction using a spring means for instance so as to allow for small resilient relative movement as required for neutralising slight errors in manufacture, and
  • levers 6 and 10 also for a variable setting of the angular relationship between levers 6 and 10 which may be obtained by a conventional means, such as a pusher screw, and opposing spring (not-shown).
  • a conventional means such as a pusher screw, and opposing spring (not-shown).
  • the lever 6 is rowiththe fixed contact 1, and the final portion of the movement compresses the spring 8.
  • Lever 10 connected to lever 6 by the member 12 moves in the same sense, a separate cam surface associated with roller 9 of lever 10 being shaped to permit said clockwise displacement of lever 10. This cam surface is' also shaped to rotate lever 10 counterclockwise as required for disengaging contact 3 from contact 1.
  • each one of the levers 6 and 10 is bifurcated and comprises two side walls, one of which is bent so that the rollers 7 and 9 are olfset in the direction of the cam axis and the axis of the pivot 11.
  • This axial displacement permits employment of coaxial but separate and differently shaped cam discs for cooperation with the two rollers 7 and 9. If desired the angular relationship of the two cam surfaces can be adjusted and the cams can be mounted with mutual overlap.
  • roller 7 can be used with advantage to control the contact closing movement, where as roller 9 controls the contact opening.
  • the spring 8 which serves primarily for the wiping movement also produces contact pressure between 1 and 3.
  • a conventional spring (not shown) for contact pressure bias can be relieved, or may be completely dispensed with.
  • Fig. 3 in which similar parts are denoted by the same reference characters, shows an embodiment substantially similar to that of Figs. 1 and 2.
  • a single lever 6a is employed in lieu of levers 6, 10 to carry the actuating rollers 7, 9, and instead of the resilient connecting member 12 of the first embodiment a biasing element 124, comprising for instance compression springs 14, 15, cooperates with a bracket 16 secured to the lever 6a and a stationary support 17 fastened to or forming part of the fixed structure 2, to eliminate back-lash between the rollers 7, 9 and their cam surfaces and also to maintain in a resilient fashion the angular position of lever 6a in relation to the fixed structure 2.
  • a biasing element 124 comprising for instance compression springs 14, 15 cooperates with a bracket 16 secured to the lever 6a and a stationary support 17 fastened to or forming part of the fixed structure 2, to eliminate back-lash between the rollers 7, 9 and their cam surfaces and also to maintain in a resilient fashion the angular position of lever 6a in relation to the fixed structure 2.
  • the spring arrangerhent 14, 15 biases the contact 3 to its open position, whereas the member 12 of the first embodiment biases the contact 3 to its closed position.
  • the springs 14, 15 are positioned so as to afford a desired anti-back-lash effect without substantially increasing the load on the cam shaft.
  • the biasing element is formed by two springs 14, 15 pressing against the outer surfaces of parts 16, 17 and a rod 18 extends through the interiorof the coiled springs to press against outer spring caps .19, 20, the characteristic of the spring assembly can be made to be substantially linear so as to keep to a minimum the torque required from the operatingcam shaft.
  • rollers are provided between the rollers and their co-operating cam surfaces.
  • a light spring can be mounted adjacent to roller 9 in such a manner that the back-lash is taken up when the contactor is open by lightly loading roller 9 onto its cam profile. When roller 7 is moved by its cam to close and wipe the contacts the light spring partially counterbalances the load thereby reducing the torque requirement.
  • a cam operated electric contact arrangement having a fixed contact and a movable contact, a rocker carrying said movable contact, lever means carrying a first cam follower adapted for effecting contact-closing, and a second cam follower adapted for effecting contact-opening, said'lever means also carrying a pivot, said rocker being arranged to rotate about said pivot, and a compression spring disposed between confronting surfaces of said lever means and said rocker and arranged to bias said rocker away from said lever means to cause wiping between the two contact surfaces after said movable con tact has been pressed onto said stationary contact through the action of said first cam follower.
  • lever means comprises a first lever carrying said first cam follower, a second lever carrying said second cam follower, a resilient member interconnecting the two levers and a stationary pivot for supporting the two levers.
  • each of the two levers comprises two side walls, one of the side walls of each lever being bent to enable offsetting of one cam follower relative to the other cam follower in the direction of the axis of the common pivot of the two levers.
  • lever means comprises a unitary lever, with a resilient positioning means being provided to resiliently hold said lever in a predetermined position.

Landscapes

  • Transmission Devices (AREA)
  • Push-Button Switches (AREA)
  • Mechanisms For Operating Contacts (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
US791769A 1958-02-07 1959-02-06 Cam operated contactors Expired - Lifetime US2979592A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4143/58A GB843564A (en) 1958-02-07 1958-02-07 Improvements in and relating to cam operated contactors

Publications (1)

Publication Number Publication Date
US2979592A true US2979592A (en) 1961-04-11

Family

ID=9771567

Family Applications (1)

Application Number Title Priority Date Filing Date
US791769A Expired - Lifetime US2979592A (en) 1958-02-07 1959-02-06 Cam operated contactors

Country Status (4)

Country Link
US (1) US2979592A (de)
CH (1) CH366908A (de)
DE (1) DE1119375B (de)
GB (1) GB843564A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3383485A (en) * 1967-02-23 1968-05-14 Gen Electric Cam actuated switch mechanism provided with an actuator link having an extesnion forterminating wiping action
US5504291A (en) * 1994-02-14 1996-04-02 Square D Company Contact blade assembly for a circuit breaker
WO2006034963A1 (de) * 2004-09-30 2006-04-06 Siemens Aktiengesellschaft Schaltkontaktanordnung für einen elektrischen schalter und elektrischer schalter mit einer schaltkontaktanordnung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1497827A (en) * 1920-04-02 1924-06-17 Manning Maxwell & Moore Inc Electric controller
US1541857A (en) * 1922-08-12 1925-06-16 Westinghouse Electric & Mfg Co Control apparatus

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE713759C (de) * 1937-02-12 1941-11-14 Sachsenwerk Licht & Kraft Ag Nockenschaltwalze mit durch Nockenscheiben hin und her bewegten Steuerleisten
DE732881C (de) * 1938-05-29 1943-03-13 Siemens Ag Walzenschalter mit Einschaltnocken

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1497827A (en) * 1920-04-02 1924-06-17 Manning Maxwell & Moore Inc Electric controller
US1541857A (en) * 1922-08-12 1925-06-16 Westinghouse Electric & Mfg Co Control apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3383485A (en) * 1967-02-23 1968-05-14 Gen Electric Cam actuated switch mechanism provided with an actuator link having an extesnion forterminating wiping action
US5504291A (en) * 1994-02-14 1996-04-02 Square D Company Contact blade assembly for a circuit breaker
WO2006034963A1 (de) * 2004-09-30 2006-04-06 Siemens Aktiengesellschaft Schaltkontaktanordnung für einen elektrischen schalter und elektrischer schalter mit einer schaltkontaktanordnung

Also Published As

Publication number Publication date
DE1119375B (de) 1961-12-14
CH366908A (de) 1963-01-31
GB843564A (en) 1960-08-04

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