US2519629A - Electric circuit breaker - Google Patents

Electric circuit breaker Download PDF

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Publication number
US2519629A
US2519629A US784357A US78435747A US2519629A US 2519629 A US2519629 A US 2519629A US 784357 A US784357 A US 784357A US 78435747 A US78435747 A US 78435747A US 2519629 A US2519629 A US 2519629A
Authority
US
United States
Prior art keywords
contacts
spring
strip
lever
circuit breaker
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
US784357A
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English (en)
Inventor
Bourne William George
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.)
Lucas Support Services Ltd
Original Assignee
Rotax 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 Rotax Ltd filed Critical Rotax Ltd
Application granted granted Critical
Publication of US2519629A publication Critical patent/US2519629A/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
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/22—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having electrothermal release and no other automatic release
    • H01H73/30—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having electrothermal release and no other automatic release reset by push-button, pull-knob or slide

Definitions

  • This invention relates to electric circuit break*- ers, and has for its object to enable a small breallzer responsive to the heating action ci an electric current to be provided in a simple and compact form.
  • the invention comprises the combination ci a spring loaded snapeactionlever mechanism carry-y ing a Contact and operableby either of a pair of push buttons, and a complementary contact carried by a thermally deformable member, the arrangement being such that the mechanismis also able to be actuated for' separation of the contacts by deformation of the said member.
  • the invention further cor'rimises' the combination with a circuit breaker as speciiied in the preceding paragraph, oian additional pair of contacts arranged to be closed by actuation of one oi the 'push buttons for short-circuiting at least part of the breaker tol render the thermally deformable member inoperative.
  • Figure l is a side elevation of an electric circuit breaker responsive to' the heating action of an excess current constructed in accordance with the invention.
  • Figure 2 is a horizontal section taken on' the line of Figure 1'.
  • Y l v Figure 3' is a vertical section taken on the line of Figure l.
  • a hollovv body part or frame i which is preferably made as a moulding from insulating material.
  • a sheet metal frame 2 Within the' body part is' mounted a sheet metal frame 2, and on this frame is carried a bowed spring metal strip 3* having one end pivotally anchored to' one end oi the frame 2 at 4.
  • the lever 9 also has a bent up portion I3 adjacent to the contact II) which is adapted to engage a part of the bowed strip 3 between its anchorages. Further there is arranged in the body part I adjacent to the extended end oi the bowed strip a coiled spring i4 having an integral (Cl. 20G-122) arm l5 projecting from one of its ends. Aiternatively a spring loaded pivoted ar'ni may be provided. The' free end of the arm I5 is arranged to act on one side of the extended end of the bowed strip 3 and is' movable by a push-button I6 ⁇ which forms one' of a pair slidably mounted in thev iront of the body part I (i. e.
  • the second push button I 1 is loaded by a spring I8 and is arranged to act on a part of the strip 3 ⁇ between the anchorages thereof, through the medium of the horizontal portion I9 of a lever 20 comprising a pair of parallel side portions pivotally mounted in the frame at 2
  • the bowed strip 3 is so arranged that its curvature is reversed when. it is pushed through a central position from one limit to another. It is movable in one direction by the push button Il' and in the other direction either by the contact lever 9 or by the arm I5 associated with the pushbutton i6.
  • One ci ther limit positions of the strip is determinec'l by the abutment member 5 which is adjustabie bymeans of the screw 22.
  • An extension 23 of the frame 2 which passes to the exterior ofY the body part I has secured to it a terminal piece 231.
  • a flat bi-metal strip 24 which is secured at one end to the body part and at its free end carries the complementary contact 25.
  • This strip is connected to another terminal 26 on the exterior oi the body part.
  • the required thermal deformation of t e oi-metal strip may be' eiiected by the heating action of the current passing through it when the contacts are closed, but preferably a separate heating element is employed.
  • This latter may consist of a resistance oi any convenient form, but preferably it consists of a iiat plate of metal 21 formed with parallel slots in staggered relation, the plate being mounted as shown in the body part adjacent to the side of the 1oi-metal strip 24 remote from the contact lever 9, and being connected in line with the bi-'metal strip. Also at one side of the bi-metal strip 24 there is provided in the body part an adjustable abutment screw 28.
  • the arrangement is such that closing of the contacts I0, 25 is eiiected by the action of the push button II on the portion of the bowed strip 3 lying between the anchorages. This has the eiect of reversing the curvature of the strip, causing it to assume the position shown by broken lines in Figure l, and rocking the contact lever 9. Separation of the contacts is effected by the push-button I6 through the action of the arm I5 on the extended end of the 3? bowed strip 3, causing the deflection of this strip to be again reversed so that it returns to the upper position as seen in Figure 1.
  • An electric circuit breaker comprising in combination a pair of complementary contacts, an over-centre spring, a thermally deformable member carrying one of said contacts, a lever carrying the other of said contacts and responsive to opposite movements of said spring for opening and closing said contacts, a pair of push buttons arranged to act on said spring at difierent positions for causing opposite movements of said spring past a dead-centre position, and means whereby movement imparted to said lever through said contacts in response to deformation of said thermally deformable member can serve to move said spring in the direction for causing said contacts to open.
  • An electric circuit breaker comprising in combination a pair of complementary contacts, a bowed over-centre spring, a thermally deformable bi-metal strip carrying one of said contacts, a lever carrying the other of said contacts and responsive to opposite movements of said spring for opening and closing said contacts, a pair of push buttons arranged to act on the same side of said spring at different positions for causing opposite movements of said spring past a dead centre position, and means whereby movement imparted to said lever through said contacts in response to deformation of said bi-metal strip can serve to move said spring in the direction for causing said contacts to open.
  • An electric circuit breaker comprising in combination a pair of complementary contacts, a bowed over-centre spring, Xed and adjustable anchorages supporting said spring at positions spaced apart, a thermally deformable bi-metal strip carrying one of said contacts, a lever carrying the other of said contacts and responsive to opposite movements of said spring for opening and closing said contacts, a pair of push buttons arranged to act on the same side of said spring at diierent positions for causing opposite movements of said spring past a dead centre position, and means whereby movement imparted to said lever through said contacts in response to deformation of said bi-metal strip can serve to move said spring in the direction for causing said contacts to open.

Landscapes

  • Breakers (AREA)
  • Thermally Actuated Switches (AREA)
US784357A 1946-10-30 1947-11-06 Electric circuit breaker Expired - Lifetime US2519629A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB32281/46A GB626335A (en) 1946-10-30 1946-10-30 Improvements relating to thermally responsive electric circuit breakers

Publications (1)

Publication Number Publication Date
US2519629A true US2519629A (en) 1950-08-22

Family

ID=10336170

Family Applications (1)

Application Number Title Priority Date Filing Date
US784357A Expired - Lifetime US2519629A (en) 1946-10-30 1947-11-06 Electric circuit breaker

Country Status (3)

Country Link
US (1) US2519629A (enrdf_load_html_response)
FR (1) FR956967A (enrdf_load_html_response)
GB (1) GB626335A (enrdf_load_html_response)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4510479A (en) * 1983-03-30 1985-04-09 Airpax Corporation PC-board mounted thermal breaker

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8603915D0 (en) * 1986-02-18 1986-03-26 Selley C R Ignition & restart switch

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1315466A (en) * 1919-09-09 Electric switch
US1853957A (en) * 1925-10-05 1932-04-12 Kohler Co Thermostatic switch
US2420300A (en) * 1942-12-05 1947-05-13 Pierce John B Foundation Electric overload protective device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1315466A (en) * 1919-09-09 Electric switch
US1853957A (en) * 1925-10-05 1932-04-12 Kohler Co Thermostatic switch
US2420300A (en) * 1942-12-05 1947-05-13 Pierce John B Foundation Electric overload protective device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4510479A (en) * 1983-03-30 1985-04-09 Airpax Corporation PC-board mounted thermal breaker

Also Published As

Publication number Publication date
FR956967A (enrdf_load_html_response) 1950-02-10
GB626335A (en) 1949-07-13

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