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US2645691A - Snap action electric switch with overload protection - Google Patents

Snap action electric switch with overload protection Download PDF

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Publication number
US2645691A
US2645691A US252909A US25290951A US2645691A US 2645691 A US2645691 A US 2645691A US 252909 A US252909 A US 252909A US 25290951 A US25290951 A US 25290951A US 2645691 A US2645691 A US 2645691A
Authority
US
United States
Prior art keywords
contact means
spring
actuator
movable contact
latch
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
US252909A
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
Priority to NL80601D priority Critical patent/NL80601C/xx
Priority to NLAANVRAGE7200449,A priority patent/NL171551B/xx
Application filed by Mechanical Products Inc filed Critical Mechanical Products Inc
Priority to US252909A priority patent/US2645691A/en
Priority to GB15143/52A priority patent/GB717881A/en
Priority to FR1059149D priority patent/FR1059149A/fr
Priority to DEM14678A priority patent/DE968304C/de
Priority to CH308366D priority patent/CH308366A/fr
Priority to ES0205818A priority patent/ES205818A1/es
Application granted granted Critical
Publication of US2645691A publication Critical patent/US2645691A/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 switches and more vparticularly to manually actuatable spring snap action switches which incorporate electrical overload protection.
  • It is yet another object of the invention to provide an electric switch assembly comprising movable contact means and a supporting structure therefor which when moved to engage the said contact means into engagement with cooperating iixed contact means energizes a spring finger assembly into retaining relationship with respect to an abutment structure in order to bias the movable contact means into the closed relation with respect to the iiXed contact means.
  • Fig. I is a side elevational view, partly in section, ofA one form of the invention showing the position of the parts in which athermal overload latch unit is held in the set operative position in which the controlled circuit contacts are closed, and is held biased into such position by the retaining action of ,a spring finger assembly incorporated in the switch structure,
  • Fig. II is a vertical end section of Fig. I,
  • Fig. III is a similar view to Fig. I; looking on the opposite side of the switch assembly, and
  • Fig. IV is a similar View to Fig. II..but with the thermal latchy shown moved to thev release position and the spring fingers at the instant of theirv outwardly deflected release position, upon the occurrence ⁇ of which the actuator plunger, carrying the spring fingers with it, moves immediately to the reset position.
  • This block i8 is mounted forV sliding movement upon actuator plunger 39, to be kdescribed later.
  • Rivets 2'2- may be employed to secure both the spring arms I3 and the thermal latchr device upon the insulated block I8..
  • the fixed contactsV l2.y are carried uponl conductor strips 24v guidedv in slots 26 in the casing lil and having terminal posts 28,0utside the casing.
  • the insulated blockv l 8 is guided upon an actuator plunger, indicated generally at 30, having integral fork portions 3i at one end and a pushpull button 33 ati its opposite end, rigidly connected with the plunger 3i), as by the securing pinV 35.
  • the push-pull button 33' is slida-bly guided in a bore portion 32 of an insulated block 34 ixedly secured upon the casing I0' and havingoppositely extending integral ears 36 and a guide slot 3.8 for accommodating the corresponding portion of the plunger 3G, shown as of bar formation but ⁇ upon opposite sides of a centrally located elon ⁇ gated block 50 secured upon the casing, as by the screw studs 52, and having, on opposite surfaces thereof, transverse depressions 54 (Fig. IV) of substantially V-section, serving as anchorages for Y snap action ⁇ spring fingers 56 secured upon the plunger 301forunitary motion therewith.
  • the spring iingers 56- are secured at one end thereof upon opposite sides of the plunger 3i), as by means of rivet 58, so as normally to deiiect outwards, as seen in Fig. IV, from engagement with the anchorages 54, this occurring when the thermal latch 20 is in the release position as shown in this figure.
  • Each spring nger is in the form of a spring blade mounted upon the actuator plunger so as normally to spring outwards, as stated, and having'any inwardly bent transversely extending deiined V-portion 59 shaped and located to engage in the anchorages 54 when in the inwardly stressed condition, with the thermal latch in the latched position as seen in Figures I to III.
  • thermal latch 20 is of bimetallic construction and is mounted upon the insulator block IB so as to deiiect outwards (to the left as seen in Fig. II) under the inuence of increase in the temperature arising in the electrical circuit, this latch being connected in electrical series with the movable contacts I4.
  • the thermal latch is in the form of a U-shaped member and is mounted upon one side of the insulator block so that its base portion can engage an abutment ledge 65 provided in fixed relation upon the actuator plunger. The ends of the U-latch are bent back and secured across the top of the insulator block, upon opposite sides of the actuator plunger 3G, as by the rivets 22 aforementioned.
  • Coil springs 6I secured between ears 62 on the slidable insulator block I8 and the ears 36 on the fixed insulator block 34, are stressed when the thermal latch 26 is engaged with the abutment ledge 60 and serve to urge the entire block and latch unit I3, 2S, together with the movable contacts I4, suddenly away from the fixed contacts I2, at the instant the latch 20 is moved from engagement with the abutment ledge 80.
  • Such adjustment can be readily effected by manual adjustment, as with the use of a screw driver, by a screw stud 64 mounted upon the actuator plunger 30 in position to engage the latch 20, as seen in Fig. II,
  • the block I8 moves away from its encompassing relation with respect to the anchored end portions of the spring ngers 55 and thereby frees these fingers to spring outwards from their previously stressed enga-gement with the anchorages 54.
  • the actuator spring 42 is stronger than these untensioned spring fingers 55 so, if freed, will immediately urge the plunger outwardly to the dotted and reset position as seen in Fig. III.
  • said actuator means comprising a plunger, said plunger being slidably mounted on said casing structure and said movable contact means being carried upon said plunger, said casing structure including fixed anchorage means said separate spring means being of spring blade form having a defined portion for engagement with said anchorage means with a cam action which gives rise to said bias action.
  • An electric switch assembly as claimed in claim 4 said actuator means being movable manually to close the contacts, and spring means for restoring the actuator means to the open contact position.
  • said biasing means comprising spring means carried by said actuator means and having a defined portion thereon and abutment means with which said defined spring portion engaged with cam action to hold the movable contact means firmly against the xed contact means.
  • an electric switch assembly having overload protection, casing structure, xed contact means in said casing structure, movable contact means positioned in said casing structure for engagement with said xed contact means, actuator means connected with said movable contact means and mounted on said casing for movement to engage said movable contact means with said xed contact means, frame structure carrying said movable contact means and a thermally responsive latch member, said frame structure being slidably mounted on said actuator means and said actuator means having :an abutment engageable by said latch member tol hold the movable contact in position to be moved by the actuator means into contact with the fixed contact means, said latch member being responsive to the current W for disengagement from said abutment upon the occurrence of a predetermined electrical overload, spring means connected to be energized when said latch member is engaged with said abutment to urge the movable contact means to open position when the latch member is disengaged from the abutment, and means actuated by said actuator means to bias the movable contact means into contact making relation

Landscapes

  • Breakers (AREA)
  • Push-Button Switches (AREA)
  • Thermally Actuated Switches (AREA)
US252909A 1951-10-24 1951-10-24 Snap action electric switch with overload protection Expired - Lifetime US2645691A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
NL80601D NL80601C (de) 1951-10-24
NLAANVRAGE7200449,A NL171551B (nl) 1951-10-24 Vervormbare thermoplastische harsachtige plaat.
US252909A US2645691A (en) 1951-10-24 1951-10-24 Snap action electric switch with overload protection
GB15143/52A GB717881A (en) 1951-10-24 1952-06-16 Improvements in and relating to overload protected electric switches
FR1059149D FR1059149A (fr) 1951-10-24 1952-06-20 Disjoncteur électrique avec protection contre les surcharges de courant
DEM14678A DE968304C (de) 1951-10-24 1952-07-06 Selbstschalter
CH308366D CH308366A (fr) 1951-10-24 1952-07-09 Disjoncteur électrique.
ES0205818A ES205818A1 (es) 1951-10-24 1952-10-15 Un interruptor eléctrico

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US252909A US2645691A (en) 1951-10-24 1951-10-24 Snap action electric switch with overload protection

Publications (1)

Publication Number Publication Date
US2645691A true US2645691A (en) 1953-07-14

Family

ID=22958055

Family Applications (1)

Application Number Title Priority Date Filing Date
US252909A Expired - Lifetime US2645691A (en) 1951-10-24 1951-10-24 Snap action electric switch with overload protection

Country Status (7)

Country Link
US (1) US2645691A (de)
CH (1) CH308366A (de)
DE (1) DE968304C (de)
ES (1) ES205818A1 (de)
FR (1) FR1059149A (de)
GB (1) GB717881A (de)
NL (2) NL171551B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1191030B (de) * 1958-05-02 1965-04-15 Texas Instruments Inc Elektrischer Kleinselbstschalter mit thermischer UEberstromausloesung und Handbetaetigung
US3217125A (en) * 1961-06-07 1965-11-09 Wood Electric Corp Circuit breaker having a cam means for very rapid opening of the contacts

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1788140B1 (de) * 1961-03-28 1973-03-29 Arrow Hart Inc Ueberstromschalter

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2255330A (en) * 1941-06-05 1941-09-09 Bulldog Electric Prod Co Switch
US2438186A (en) * 1946-01-25 1948-03-23 Stewart Warner Corp Time-delay switch
US2458807A (en) * 1945-07-16 1949-01-11 Hopax Ind Inc Thermostatic switch
US2485736A (en) * 1945-06-16 1949-10-25 Mechanical Products Inc Switch

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE649003C (de) * 1934-12-21 1937-08-12 Aeg Installationsselbstschalter mit einer Druckknopf-Klinkenfreiausloesung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2255330A (en) * 1941-06-05 1941-09-09 Bulldog Electric Prod Co Switch
US2485736A (en) * 1945-06-16 1949-10-25 Mechanical Products Inc Switch
US2458807A (en) * 1945-07-16 1949-01-11 Hopax Ind Inc Thermostatic switch
US2438186A (en) * 1946-01-25 1948-03-23 Stewart Warner Corp Time-delay switch

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1191030B (de) * 1958-05-02 1965-04-15 Texas Instruments Inc Elektrischer Kleinselbstschalter mit thermischer UEberstromausloesung und Handbetaetigung
US3217125A (en) * 1961-06-07 1965-11-09 Wood Electric Corp Circuit breaker having a cam means for very rapid opening of the contacts

Also Published As

Publication number Publication date
NL80601C (de)
GB717881A (en) 1954-11-03
NL171551B (nl)
DE968304C (de) 1958-02-06
CH308366A (fr) 1955-07-15
FR1059149A (fr) 1954-03-23
ES205818A1 (es) 1953-03-01

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