US2625625A - Free trip circuit breaker - Google Patents

Free trip circuit breaker Download PDF

Info

Publication number
US2625625A
US2625625A US165780A US16578050A US2625625A US 2625625 A US2625625 A US 2625625A US 165780 A US165780 A US 165780A US 16578050 A US16578050 A US 16578050A US 2625625 A US2625625 A US 2625625A
Authority
US
United States
Prior art keywords
latch
plunger
thermal
movable contact
contact means
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
US165780A
Other languages
English (en)
Inventor
Richard C Ingwersen
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.)
Mechanical Products Inc
Original Assignee
Mechanical Products Inc
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
Family has litigation
Priority to NL76720D priority Critical patent/NL76720C/xx
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=22600447&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=US2625625(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Mechanical Products Inc filed Critical Mechanical Products Inc
Priority to US165780A priority patent/US2625625A/en
Priority to GB12515/51A priority patent/GB711802A/en
Priority to DEM9716A priority patent/DE866514C/de
Application granted granted Critical
Publication of US2625625A publication Critical patent/US2625625A/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 breakers which have overload protection and incorporate a thermal latch construction responsive to the temperature of the circuit current to break (or open) the circuit automatically upon the occurrence of a predetermined overload. More particularly, the invention relates to an electric circuit breaker of the same general construction and arrangement is disclosed in United States Patent No. 2,485,736, dated October 25, 1949, but modified to provide a trip-free action, by which the manual holding of the movable contacts against separation is not possible when a predetermined maximum current loading or value has been attained. In the prior construction it is oossible to override the overload protection by manually holding the contacts closed through pressure applied to the movable contact actuator button. An object of the present invention is to prevent such overriding action from occurring. .Another object of the invention is to provide an electric circuit breaker with which overriding of the overload. is possible for a predetermined lower current output, but is impossible for a predetermined higher or maximum current value.
  • Fig. I is a side elevational view of on practical form of the invention, with one-half of the casing structure removed, and showing the contacts and latch parts in closed position,
  • Fig. II is a similar view to Fig. I but showing the contacts and associated latch parts in open position
  • Fig. III is a longitudinal section on the line A-A of Fig. I,
  • Fig, IV is a detail section on the line BB of Fig. I, and
  • Fig. V is a perspective view of the movable contact and latch unit in association with its supporting plunger actuator and guide structure.
  • the casing structure of the circuit breaker is shown composed of two similar molded sections is and !2 of a suitable insulating material assembled together in opposed relation, with a dividing line indicated at the line It.
  • Each casing section defines an internal cavity it which combine, as seen in Fig. III, to provide a-common cavity 18 in which the iii) fixed and movable contacts, indicated generally at 2% and 22, respectively, and the thermal latch mechanism, indicated generally at 2 3, are housed and the sides of which cavity it are movably closed by suitable cover plates (not shown).
  • the f red contacts 29 are carried upon conduotor terminals held embedded in recessed portions of the assembled casing sections l8 and [2 these sections being conveniently held together by transverse screw studs 23 and associated nuts 28 which may also serve to secure the said side plates in position to close the sides of the cavity E8.
  • the movable contacts 22 are carried at the outer ends of flexible arms 3b, which arms, at their inner ends, are secured upon inturned portions 32 (Fig. V) or" a U-shape thermal latch part 35 and or" an external temperature compensating finger assembly, indicated generally at at (Fig. III).
  • the U-shape latch part as is electrically connected in series with the movable contacts and their carrier arms 3 whereby this contact assembly is subjected to the electric current flow when the contacts are held closed, as seen in Fig. I.
  • the compensating finger assembly 35 is electrically insulated from the circuit, as by the insulation 55, seen in Fig. III, whereby this assembly is not influenced by the temperature of the electrical circuit but only by the prevailing external temperatures, substantially as and. for the purpose disclosed in my copending application Serial No. 136,969 filed January 5, 1950, now U. S. Patent No. 2,587,162, granted February 26, 1952.
  • the structure All comprises spaced apart block portions 44 which define an elongated slot 4'. between them in which a finger projection 48 on the actuator plunger 32 is guided for movement to actuate the thermal latch for resetting against spaced apart abutment ledges on the inner ends of the blocks A l, much in the same way as, and for the purpose disclosed, in the said prior Patent No. 2,485,736 in my name.
  • the structure is such that the freely slidable upon the actuator 42 and, by the action of the springs 52, will immediately snap to the open contact position, as seen in Fig.
  • the latch 24 and the compensator finger assembly 56 slide past the opposite and respective blocks 84 of the fixed guide structure, which guides the thermal latch and movable contact unit for its required rectilinear motion into the contact open position; besides guiding the unit back to its reset and contact closed position when the actuator plunger 42 is actuated. Simultaneously with the opening movement of the said unit, the plunger actuator 52 is also moved to the outwardly projected position, as seen in Fig. II,
  • the insertion 55 has its top portion 66 located opposite the inner ends of the arms 35 of the movable contacts and is constantly biased against the opposed end of the plunger actuator (actually against the base 62 of the fork) by the action of said spring 55, one end of which bears within a recess 53 in the divided casing parts ID, 12, whereas the opposite end bears within the recess 65 defined by the fork prongs 58.
  • the latch part 3 1 is made from springy metal and that this part is initially formed so that it springs inwards at its outer end (as defined by the base of the U-shape latch part) so that upon this end of the latch part arriving at the abutment ledges 5! ⁇ it will immediately spring inwards into edgewise engagement with the ledges by the engagement of the edges of its end portions 34' with these ledges, which portions 34 lie upon opposite sides of the depression 5d, and which depression, it is to be noted, lies within the confines of the slot 45 and in the path of the finger projections is on the plunger 42.
  • the T-shape block insertion 56 is slidably mounted in the forked end portion of the plunger 42 and has its end portion 69 disposed on the side of the inner ends of the movable contact arms 3!) remote from the thermal latch part 34. It should also be borne in mind that, in the outwardly projected condition of the plunger 42 there is clearance between the finger projection 43 and the latch depression 54.
  • the latch part is in an outwardly sprung condition, in which its outer end presses against the side surfaces of the blocks M so that the said end portions 34' are outwardly disposed with respect to the edges of the abutment ledges 53 an extent corresponding substantially to the thickness of the metal of the latch part 35.
  • the outer edge of the finger projection 48 lies substantially flush with, or within, the outer edges of the abutment ledges 5!].
  • the finger projection 48 will, by engagement with the inwardly directed edge presented by the depression 54, push the latch part 35 inwards, and with it, the entire unit constituted by the parts as. 56, 35, 22.
  • the springs 52 will be tensioned and the spring 55 will be compressed.
  • the said unit will then be held in the contact closed position, as seen in Fig. I, in which position the circuit breaker is set for operation, with the springs 52 tensioned and the spring 55 compressed.
  • thermal latch part 34 Upon current being conducted through the thermal latch part 34, this part, being of bi-metallic construction, will be distorted and will distort outwardly at its outer end.
  • the construction and arrangement, and the cali bration oi the thermal latch part 34, is such that upon the latch part being heated to an extent corresponding to a predetermined current value, the edge portions of the latch part defined by the latch portions 34' will leave the abutment ledges 50.
  • the said unit will immediately and suddenly move outwards to the contact-open position, by the action of the springs 52.
  • the plunger 42 will move outwards by the action of its spring 55.
  • the latch unit can be re-set. .thatthedepression 54, travels inthe slot 4-5 and is plunger 42.
  • the plunger continues to be held in at the time when the trailing edge of the depression 54 leaves the finger projection 48, the base of the U-shape latch part, in moving with the said unit to the contact-open position, will pass by the finger projection with the result that the finger projection43 will then become located adjacent the inside edge of the base of the latch part; that is the edge remote from-the depression 54.
  • the finger projection 48 should be located adjacent the depression 54 in order that the plunger-can be actuated to reset the thermal latch unit in the contact closed position. It is also necessary that the plungen-efi.
  • the T-part 55% is mounted on the plunger for movement therewith and that only the portion so thereof lies in the oath of the movable contact arms 39.
  • an electric circuit breaker having overload protection, casing structure, fixed contact means in said casing, movable contact means in said casing in opposed relation to said fixed contact means, a thermal latch in electric series connection with said movable contact means, said thermal latch and the movable contact means being of unitary construction, abutment structure in said casing with which said thermal latch is adapted to cooperate to hold the movable contact means in closed relation to said fixed contact means, actuator means on said casing adapted to set the thermal latch in latched engagement with said abutment structure and to close the movable contact means, means slidably mounting said latch and movable contact unit upon said actuator for unified movement thereon upon the occurrence of a predetermined maximum overload and means on said actuator and latch cooperable to hold the thermal latch against such relative movement in overriding relationship to a lower current overload.
  • said latch having a protruding ledge portion for location against said means on the plunger structure, said plunger structure being capable of being manually held to override disengagement of the latch from the said abutment means until the latch ledge portion has cleared said means on the plunger, when the plunger structure is no longer capable of holding the latch against disengagement from said abutment means.

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US165780A 1950-06-02 1950-06-02 Free trip circuit breaker Expired - Lifetime US2625625A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
NL76720D NL76720C (zh) 1950-06-02
US165780A US2625625A (en) 1950-06-02 1950-06-02 Free trip circuit breaker
GB12515/51A GB711802A (en) 1950-06-02 1951-05-28 Improvements in and relating to electric circuit breakers
DEM9716A DE866514C (de) 1950-06-02 1951-06-01 Elektrischer Unterbrecher

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US165780A US2625625A (en) 1950-06-02 1950-06-02 Free trip circuit breaker

Publications (1)

Publication Number Publication Date
US2625625A true US2625625A (en) 1953-01-13

Family

ID=22600447

Family Applications (1)

Application Number Title Priority Date Filing Date
US165780A Expired - Lifetime US2625625A (en) 1950-06-02 1950-06-02 Free trip circuit breaker

Country Status (4)

Country Link
US (1) US2625625A (zh)
DE (1) DE866514C (zh)
GB (1) GB711802A (zh)
NL (1) NL76720C (zh)

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2701829A (en) * 1951-08-03 1955-02-08 Cutler Hammer Inc Manually operable circuit breaker
DE959292C (de) * 1953-05-19 1957-03-07 Licentia Gmbh Schmelzsicherung
US2798918A (en) * 1954-03-03 1957-07-09 Westinghouse Electric Corp Circuit breaker
US2824931A (en) * 1955-03-07 1958-02-25 Mechanical Products Inc Electric overload circuit breaker
US2864914A (en) * 1955-01-27 1958-12-16 C T Electrical Controls Ltd Electric circuit breaker
US2875296A (en) * 1954-06-08 1959-02-24 Weber Ag Fab Elektro Automatic circuit breaker
US2922008A (en) * 1957-07-31 1960-01-19 Westinghouse Electric Corp Circuit breaker
US3516090A (en) * 1965-05-21 1970-06-02 Gen Electric Current limiting circuit breaker with independent acting high speed opening means
US3868614A (en) * 1971-07-06 1975-02-25 Aiken Ind Inc Improved circuit breaker trip mechanism
US3873797A (en) * 1972-08-14 1975-03-25 Siemens Ag Switch position indicator for electromagnetic switchgear
US20060109073A1 (en) * 2004-11-23 2006-05-25 Mechanical Products Circuit breaker
US20100305565A1 (en) * 2000-08-01 2010-12-02 Arqos Surgical, Inc. Voltage threshold ablation apparatus
US8323280B2 (en) 2011-03-21 2012-12-04 Arqos Surgical, Inc. Medical ablation system and method of use
US9204918B2 (en) 2011-09-28 2015-12-08 RELIGN Corporation Medical ablation system and method of use
US9247983B2 (en) 2011-11-14 2016-02-02 Arqos Surgical, Inc. Medical instrument and method of use
US9585675B1 (en) 2015-10-23 2017-03-07 RELIGN Corporation Arthroscopic devices and methods
US9603656B1 (en) 2015-10-23 2017-03-28 RELIGN Corporation Arthroscopic devices and methods
US9681913B2 (en) 2015-04-21 2017-06-20 RELIGN Corporation Arthroscopic devices and methods
US10004556B2 (en) 2013-05-10 2018-06-26 Corinth MedTech, Inc. Tissue resecting devices and methods
US10022140B2 (en) 2016-02-04 2018-07-17 RELIGN Corporation Arthroscopic devices and methods
US10595889B2 (en) 2016-04-11 2020-03-24 RELIGN Corporation Arthroscopic devices and methods
US11065023B2 (en) 2017-03-17 2021-07-20 RELIGN Corporation Arthroscopic devices and methods
US11172953B2 (en) 2016-04-11 2021-11-16 RELIGN Corporation Arthroscopic devices and methods
US11207119B2 (en) 2016-03-11 2021-12-28 RELIGN Corporation Arthroscopic devices and methods
US11426231B2 (en) 2017-01-11 2022-08-30 RELIGN Corporation Arthroscopic devices and methods

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2798920A (en) * 1955-07-25 1957-07-09 Mechanical Products Inc Electric circuit breaker with mechanical latch setting thermal latch
DE1039102B (de) * 1956-08-27 1958-09-18 Wickmann Werke Ag Elektrischer Ausloeser
DE1047253B (de) * 1956-08-27 1958-12-24 Wickmann Werke Ag Elektrischer Ausloeser fuer Fernmeldeanlagen

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1492967A (en) * 1921-03-24 1924-05-06 Connecticut Telephone & Elec Automatic cut-out
FR781446A (fr) * 1934-02-08 1935-05-15 Gardy Sa Perfectionnements aux disjoncteurs thermiques à maximum d'intensité
US2210261A (en) * 1939-02-27 1940-08-06 Colt S Mfg Co Automatic circuit breaker
US2217488A (en) * 1939-03-31 1940-10-08 Westinghouse Electric & Mfg Co Thermal overload relay
GB560004A (en) * 1942-09-11 1944-03-15 British Thomson Houston Co Ltd Improvements in and relating to electric switches
GB614510A (en) * 1945-08-01 1948-12-16 Landis & Gyr Sa An improved automatic electrical cut-out
US2485736A (en) * 1945-06-16 1949-10-25 Mechanical Products Inc Switch

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1492967A (en) * 1921-03-24 1924-05-06 Connecticut Telephone & Elec Automatic cut-out
FR781446A (fr) * 1934-02-08 1935-05-15 Gardy Sa Perfectionnements aux disjoncteurs thermiques à maximum d'intensité
US2210261A (en) * 1939-02-27 1940-08-06 Colt S Mfg Co Automatic circuit breaker
US2217488A (en) * 1939-03-31 1940-10-08 Westinghouse Electric & Mfg Co Thermal overload relay
GB560004A (en) * 1942-09-11 1944-03-15 British Thomson Houston Co Ltd Improvements in and relating to electric switches
US2485736A (en) * 1945-06-16 1949-10-25 Mechanical Products Inc Switch
GB614510A (en) * 1945-08-01 1948-12-16 Landis & Gyr Sa An improved automatic electrical cut-out

Cited By (46)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2701829A (en) * 1951-08-03 1955-02-08 Cutler Hammer Inc Manually operable circuit breaker
DE959292C (de) * 1953-05-19 1957-03-07 Licentia Gmbh Schmelzsicherung
US2798918A (en) * 1954-03-03 1957-07-09 Westinghouse Electric Corp Circuit breaker
US2875296A (en) * 1954-06-08 1959-02-24 Weber Ag Fab Elektro Automatic circuit breaker
US2864914A (en) * 1955-01-27 1958-12-16 C T Electrical Controls Ltd Electric circuit breaker
US2824931A (en) * 1955-03-07 1958-02-25 Mechanical Products Inc Electric overload circuit breaker
US2922008A (en) * 1957-07-31 1960-01-19 Westinghouse Electric Corp Circuit breaker
US3516090A (en) * 1965-05-21 1970-06-02 Gen Electric Current limiting circuit breaker with independent acting high speed opening means
US3868614A (en) * 1971-07-06 1975-02-25 Aiken Ind Inc Improved circuit breaker trip mechanism
US3873797A (en) * 1972-08-14 1975-03-25 Siemens Ag Switch position indicator for electromagnetic switchgear
US20100305565A1 (en) * 2000-08-01 2010-12-02 Arqos Surgical, Inc. Voltage threshold ablation apparatus
US8333763B2 (en) 2000-08-01 2012-12-18 Arqos Surgical, Inc. Voltage threshold ablation apparatus
US20060109073A1 (en) * 2004-11-23 2006-05-25 Mechanical Products Circuit breaker
US7310041B2 (en) * 2004-11-23 2007-12-18 Mp Hollywood Llc Circuit breaker
US8323280B2 (en) 2011-03-21 2012-12-04 Arqos Surgical, Inc. Medical ablation system and method of use
US11712282B2 (en) 2011-03-21 2023-08-01 RELIGN Corporation Medical ablation system and method of use
US10292751B2 (en) 2011-03-21 2019-05-21 RELIGN Corporation Medical ablation system and method of use
US9277954B2 (en) 2011-03-21 2016-03-08 Arqos Surgical, Inc. Medical ablation system and method of use
US9795434B2 (en) 2011-09-28 2017-10-24 RELIGN Corporation Medical ablation system and method of use
US11229477B2 (en) 2011-09-28 2022-01-25 RELIGN Corporation Medical ablation system and method of use
US9204918B2 (en) 2011-09-28 2015-12-08 RELIGN Corporation Medical ablation system and method of use
US11672586B2 (en) 2011-09-28 2023-06-13 RELIGN Corporation Medical ablation system and method of use
US9592085B2 (en) 2011-09-28 2017-03-14 RELIGN Corporation Medical ablation system and method of use
US9247983B2 (en) 2011-11-14 2016-02-02 Arqos Surgical, Inc. Medical instrument and method of use
US10342603B2 (en) 2011-11-14 2019-07-09 RELIGN Corporation Medical instrument and method of use
US10004556B2 (en) 2013-05-10 2018-06-26 Corinth MedTech, Inc. Tissue resecting devices and methods
US10582966B2 (en) 2015-04-21 2020-03-10 RELIGN Corporation Arthroscopic devices and methods
US9681913B2 (en) 2015-04-21 2017-06-20 RELIGN Corporation Arthroscopic devices and methods
US11419670B2 (en) 2015-10-23 2022-08-23 RELIGN Corporation Arthroscopic devices and methods
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US9585675B1 (en) 2015-10-23 2017-03-07 RELIGN Corporation Arthroscopic devices and methods
US9603656B1 (en) 2015-10-23 2017-03-28 RELIGN Corporation Arthroscopic devices and methods
US11771456B2 (en) 2016-02-04 2023-10-03 RELIGN Corporation Arthroscopic devices and methods
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US11207119B2 (en) 2016-03-11 2021-12-28 RELIGN Corporation Arthroscopic devices and methods
US11172953B2 (en) 2016-04-11 2021-11-16 RELIGN Corporation Arthroscopic devices and methods
US11622784B2 (en) 2016-04-11 2023-04-11 RELIGN Corporation Arthroscopic devices and methods
US10595889B2 (en) 2016-04-11 2020-03-24 RELIGN Corporation Arthroscopic devices and methods
US12042167B2 (en) 2016-04-11 2024-07-23 RELIGN Corporation Arthroscopic devices and methods
US11426231B2 (en) 2017-01-11 2022-08-30 RELIGN Corporation Arthroscopic devices and methods
US12004765B2 (en) 2017-03-17 2024-06-11 RELIGN Corporation Arthroscopic devices and methods
US11065023B2 (en) 2017-03-17 2021-07-20 RELIGN Corporation Arthroscopic devices and methods

Also Published As

Publication number Publication date
NL76720C (zh)
GB711802A (en) 1954-07-14
DE866514C (de) 1953-05-21

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