US3117198A - Pivoted snap switch having manual actuating lever - Google Patents

Pivoted snap switch having manual actuating lever Download PDF

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Publication number
US3117198A
US3117198A US120102A US12010261A US3117198A US 3117198 A US3117198 A US 3117198A US 120102 A US120102 A US 120102A US 12010261 A US12010261 A US 12010261A US 3117198 A US3117198 A US 3117198A
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Prior art keywords
lever
elastic
contact
main
free
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Expired - Lifetime
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US120102A
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English (en)
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Bille-Knudsen Klaus
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Individual
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Individual
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H5/00—Snap-action arrangements, i.e. in which during a single opening operation or a single closing operation energy is first stored and then released to produce or assist the contact movement
    • H01H5/04—Energy stored by deformation of elastic members
    • H01H5/06—Energy stored by deformation of elastic members by compression or extension of coil springs

Definitions

  • the present invention concerns a switching system with tilt mechanism and adjustable contact separation of the type employing a sprung tilt arm which, for the purpose of actuating a biased contact spring, is so connected through a tension spring to a pivoted operating arm, that an external force applied to the operating arm is transmitted to the tilt arm.
  • the aim of this invention is to design a switching system with one adjustable contact separation in an operating position, and a much greater separation in a manually disengaged position.
  • a switching system of this type is primarily intended for use with thermostats, pressostats and similar instruments. In the thermostat of an evaporator, very little contact separation, e.g. a few tenths of a millimeter, is desired in the operating position, Whereas in the disengaged position a much greater contact separation, for example 3 millimeters or more, is required.
  • a design has been provided which renders it possible by differential adjustment to alter the contact separation in the operating position and to retain the wide contact separation in the manually disengaged position.
  • the switching system according to the invention is of the type which is open in the absence of an external force, and is characterized by an adjustable stop, which is so connected to the operating arm, that during transfer of the latter from a disengaged position with wide contact separation to an operating position with narrow contact separation, the stop will actuate the tilt arm to snap through its dead center position, and in the operating position of the operating arm will form an adjustable stop for the tilt arm when the contact breaks.
  • One embodiment of the switching system according to the invention is characterized by the fact that the adjustable stop is in the form of an adjustable screw situated on the operating arm nearer the rotating center of the arm than the point to which external force is applied.
  • a switching system like this is comparatively simple and robust, and the external force to be applied to the operating arm can be comparatively small, because the arm functions as a lever.
  • Another embodiment of the switching system according to the invention is characterized by the fact that the stop is formed by that end of a two-armed lever, the fulcrum of which is supported by the arm transferring the force, which is nearer the pivot of the arm that the point to which the external force is applied.
  • the contact spring biased towards the fixed contact be provided with a U-shaped bent portion at its free end, in which bent portion the tilt arm can move.
  • a high speed of transfer between engagement and disengagement of the movable contact member of the system lt atented Jan. 7, 1954 is achieved, and according to the invention, contact bounce can be considerably reduced since, that the tilt arm is fitted with a stop which is so placed, that in the closed position of the system the stop will bear against the contact spring immediately at that side of the movable contact which is nearest the fixing point of the contact spring.
  • FIGURES 1 and 2 show a first embodiment of a contact system according to the invention in disengaged and operating position, respectively, the contact being engaged in the latter position;
  • FIGURES 3 to 5 show a second embodiment of the switching system according to the invention in disengaged position and operating position with the contact open and closed, respectively.
  • An operating arm or main lever 1 which serves for the transfer of an external force to the switching system, is pivotally mounted at a fixed point 2.
  • the arm is in the shape of an inverted U, one leg being extended farther downwards than the other end and being supported by its pivoted end at the point 2.
  • a tension spring 3 connects the free end of the operating arm 1 to a point 5 on a tilt arm or lever 6, which is supported in a fixed knife-edge bearing 7.
  • the tilt arm 6 will actuate a contact elastic or spring lever 8 in the form of a leaf spring.
  • the spring 3 biases the lever 6 to a rest position and applies a rotational force to the lever 1 in a counterclockwise direction holding the free end of the lever 1 from rotating clock wise.
  • the free end of the contact spring carries the movable contact 9 of the system, and the other end of the contact spring is secured at the point 10 with a bias towards the fixed contact 11 of the system, thus oflering suflicient contact pressure until the contact is snapped off.
  • the low position of the pivot 2 of the operating arm 1 in relation to the fixing point of the spring 3 will cause the operating arm to assume the disengaged position when not influenced by an external force.
  • the underside of the tilt arm 6 is fitted with a stop 12, which reduces contact bounce, if any, because the stop bears against a point immediately at that side of the contact which faces the fixing point Jill, thus forming here a node for any oscillation of the contact spring 8.
  • FIGURES 1 and 2 show a simple switching system according to the invention where an adjusting screw 12 in the operating arm 1 forms an adjustable stop through which the contact separation in the operating position can be adjusted.
  • the operating arm is influenced by an external or counter rotational force P, and acts through the adjusting screw 12 as a lever upon the tilt arm 6, thus reducing the force P required for engagement.
  • a force p from an evaporator thermostat for example, is applied to the operating arm.
  • the tension spring 3 will pull the arm ll upwards until the points 4, 5 and 7 are on a line, whereupon the tilt arm at a continued slight movement of the arm 1 snaps upwards, hitting a U-shaped bent portion 1-3 at the free end of the contact spring 8 and thus separating the contacts 9 and 11. Since the contact spring 8 is biased towards the fixed contact 11 the contact pressure is maintained until the tilt arm 6 at high speed hits the lost motion connection means comprising U-shaped end 13 of the spring 8. The transfer continues until the tilt arm 6 bears against the adjustable stop, in this cause adjusting screw 12'.
  • the switching system shown in FIGURES 3 to 5 operates in the same way, but diiiers from the other system in that the arm 1 is provided with a bearing 14 which supports a two-armed lever carrying a stop 16 at one end, which stop during transfer from the disengaged position to the operating position actuates the tilt arm 6. At the opposite end the two-armed lever will bear against an adjusting screw 17 which is statically mounted on the switch housing, and therefore easy to adjust.
  • the stop '16 will exert a pressure on the upper side of the tilt arm 6 until the arm has passed through the dead center position, when the system is switched into the operating position by applying manually a force P to the arm 1, FIG. 3.
  • the efiect described above may also be achieved by letting the said levers actuate the contact spring directly.
  • a snap switch in combination, a stationary contact, an elastic lever having one end pivoted and another end free biased in a direction toward said fixed contact, a contact on said elastic lever disposed for engaging said fixed contact when said spring lever is free to move in a direction toward said stationary contact a distance suiiicient for closing said contacts at a contact-closing position of said elastic lever, means for controllably operating said elastic lever to said contact-closing position and to a position for maintaining said contacts in a separated and electrically open position comprising, a main lever having one end pivotally secured and another end free, said pivotally secured end of the main lever being disposed vertically and horizontally closer to said fixed contact than said free end of said main lever, said elastic lever extending in a plane parallel to the main lever, a contactactuating third lever having one end pivoted at a stationary point and an opposite free end, means elastically applying a force on said third lever toward said stationary point and rotationally and toward a rest position of said third lever and cooperating therewith for urging pivotally rotationally said
  • means for controllably operating said elastic lever to said contact-closing position and to a position for maintaining said contacts in a separated and electrically open position comprising, a main lever having one end pivotally secured and another end free, said pivotally secured end of the main lever being disposed vertically and horizontally closer to said fixed contact than said free end of said main lever, said elastic lever extending in a plane parallel to the main lever, a contact-actuating third lever having one end pivoted at a stationary point and an opposite free end, means elastically applying a force on said third lever toward said stationary point and rotationally and toward a rest position of said third lever and cooperating therewith for urging pivotally rotationally said free end of said main lever a limited extent in adirection toward the free end of said third lever, said elastic means being connected to said main lever at a fixed point thereon movable in conjunction with said main lever
  • a stationary contact an elastic lever having one end pivoted and another end free biased in a direction toward said fixed contact, a contact on said elastic lever disposed for engaging said fixed contact when said spring lever is free to move in a direction toward said stationary contact a distance sufficient for closing said contacts at a contact-closing position of said elastic lever, means for controllably operating said elastic lever to said contact-closing position and to a position for maintaining said contacts in a separated and electrically open position comprising, a main lever having one end pivotally secured and another end free, said pivotally secured end of the main lever being disposed vertically and horizontally closer to said fixed contact than said free end of said main lever, said elastic lever extending in a plane parallel to the main lever, a contact-actuating third lever having one end pivoted at a stationary point and an opposite free end, means elastically applying a force on said third lever toward said stationary point and rotationally toward a rest position of said third lever and cooperating therewith for urging pivotally, rotationally said free end of
  • a stationary contact an elastic lever having one end pivoted and another end free biased in a direction toward said fixed contact, a contact on said elastic lever disposed for engaging said fixed contact when said spring lever is free to move in a direction toward said stationary contact a distance sufficient for closing said contacts at a contact-closing position of said elastic lever, means for controllably operating said elastic lever to said contact-closing position and to a position for maintaining said contacts in a separated and electrically open position comprising, a main tlever having one end pivotally secured and another end free, said pivotally secured end of the main lever being disposed vertically and horizontally closer to said fixed contact than said free end of said main lever, said elastic lever extending in a plane parallel to the main lever, a contact-actuating third lever having one end pivoted at a stationary point and an opposite free end, means elastically applying a force on said third lever toward said stationary point and rotationally toward a rest position of said third lever and cooperating therewith for urging pivotally, rotationally said
  • a snap switch in combination, a stationary contact, an elastic lever having one end pivoted and another end free biased in a direction toward said fixed contact, a contact on said elastic lever disposed for engaging said fixed contact when said spring lever is free to move in a direction toward said stationary contact a distance sufficient for closing said contacts at a contact-closing position of said elastic lever, means for controllably operating said elastic lever to said contact-closing position and to a position for maintaining said contacts in a separated and electrically open position comprising, a main lever having one end pivota lly secured and another end free, said pivotally secured end of the main lever being disposed vertically and horizontally closer to said fixed contact than said free end of said main lever, said elastic lever extending in a plane parallel to the main lever, a contact-actuating third lever having one end pivoted at a stationary point and an opposite free end, means elastically applying a force on said third lever toward said stationary point and rotationally toward a rest position of said third lever and cooperating therewith for urging pivotally rotationally said free end

Landscapes

  • Mechanisms For Operating Contacts (AREA)
  • Lift Valve (AREA)
  • Thermally Actuated Switches (AREA)
US120102A 1960-05-11 1961-05-11 Pivoted snap switch having manual actuating lever Expired - Lifetime US3117198A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK186160AA DK101927C (da) 1960-05-11 1960-05-11 Kontaktsystem med kipmekanisme.

Publications (1)

Publication Number Publication Date
US3117198A true US3117198A (en) 1964-01-07

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ID=8108605

Family Applications (1)

Application Number Title Priority Date Filing Date
US120102A Expired - Lifetime US3117198A (en) 1960-05-11 1961-05-11 Pivoted snap switch having manual actuating lever

Country Status (7)

Country Link
US (1) US3117198A (de)
BE (1) BE603724A (de)
CH (1) CH403013A (de)
DE (2) DE1883250U (de)
DK (1) DK101927C (de)
GB (1) GB990575A (de)
NL (2) NL264616A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0329847A1 (de) * 1988-02-24 1989-08-30 Schaltbau Gesellschaft mbH Schnappschaltelement
EP2629311A1 (de) * 2010-10-12 2013-08-21 Omron Corporation Schalter

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB551021A (en) * 1941-09-11 1943-02-04 British Thermostat Co Ltd Improvements in or relating to snap action switch mechanism
US2691082A (en) * 1947-10-02 1954-10-05 Proctor Electric Co Circuit controlling device
US2800546A (en) * 1954-10-19 1957-07-23 Reitler Paul Miniature switch
US2821588A (en) * 1955-04-29 1958-01-28 Controls Co Of America Snap acting electric switch
US3056002A (en) * 1959-10-19 1962-09-25 Cherry Electrical Prod Snap-action switch

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2328154A (en) * 1939-08-05 1943-08-31 Square D Co Electric switch
DE1040649B (de) * 1956-12-31 1958-10-09 Kloeckner Moeller Elektrizit Temperaturwaechter
BE562418A (de) * 1957-04-10
US2855486A (en) * 1957-08-15 1958-10-07 Robertshaw Fulton Controls Co Thermostatic switches

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB551021A (en) * 1941-09-11 1943-02-04 British Thermostat Co Ltd Improvements in or relating to snap action switch mechanism
US2691082A (en) * 1947-10-02 1954-10-05 Proctor Electric Co Circuit controlling device
US2800546A (en) * 1954-10-19 1957-07-23 Reitler Paul Miniature switch
US2821588A (en) * 1955-04-29 1958-01-28 Controls Co Of America Snap acting electric switch
US3056002A (en) * 1959-10-19 1962-09-25 Cherry Electrical Prod Snap-action switch

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0329847A1 (de) * 1988-02-24 1989-08-30 Schaltbau Gesellschaft mbH Schnappschaltelement
EP2629311A1 (de) * 2010-10-12 2013-08-21 Omron Corporation Schalter
EP2629311A4 (de) * 2010-10-12 2014-11-19 Omron Tateisi Electronics Co Schalter

Also Published As

Publication number Publication date
NL123326C (de)
DK101927C (da) 1965-06-14
DE1180442B (de) 1964-10-29
NL264616A (de)
DE1883250U (de) 1963-11-21
CH403013A (de) 1965-11-30
BE603724A (fr) 1961-09-01
GB990575A (en) 1965-04-28

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