US1527645A - Thermal responsive switch - Google Patents

Thermal responsive switch Download PDF

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Publication number
US1527645A
US1527645A US611394A US61139423A US1527645A US 1527645 A US1527645 A US 1527645A US 611394 A US611394 A US 611394A US 61139423 A US61139423 A US 61139423A US 1527645 A US1527645 A US 1527645A
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US
United States
Prior art keywords
switch
current
circuit
switch member
members
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
US611394A
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English (en)
Inventor
Chester I Hall
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.)
General Electric Co
Original Assignee
General Electric Co
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 FR575271D priority Critical patent/FR575271A/fr
Application filed by General Electric Co filed Critical General Electric Co
Priority to US611394A priority patent/US1527645A/en
Priority to GB547/24A priority patent/GB209436A/en
Application granted granted Critical
Publication of US1527645A publication Critical patent/US1527645A/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

  • My invention relates to improvements in thermal responsive switches and in particular to improvements in thermal responsive switches which are arranged toeffect the interruption of an electric circuit or in response to a sustained abnormal current.
  • One of the objects of the invention is the provision of an improved switch of the character indicated which will take into account the heating efi'ect caused by the current taken by an electric translating device'which is protected by the switch so that the circuit to the translating device will be automatically and quickly opened when the current taken by the translating device is abnormally hi h and. which will eflect the opening of t e circuit to the translating device in case an ordinary overload has persisted for a definite interval of time.
  • Another object of the invention is the provision of a switch of the character indicated which shall have two cooperating switch members which jointly control an electric circuit and which are individually controlled in response to the heating efiect of the cur rent in respective conductors of a supply circuit for the translating device. whereby in case an .overload is carried for a predetermined time interml by either one or both of the conductors for the translating device, at least one of the switch members of the switch will be caused to open with a snap action and thereby efiect the opening of the circuit to the transmitting device.
  • the electric switch therein shown as an embodiment of the invention comprises two relatively movable switch members 10 and 11 which are adapted to make engagement with each other at their respective contacts so as to complete an electric circuit through the switch contacts.
  • the switch member 10 is secured to a block 12 of insulating material which has a pivotal connection with and is supported by the pivotally mounted adjusting member 13.
  • the switch member 10 is biased to the open posit1on (out of engagement with the switch member 11) by means of the spring 14 which has one end connected with the post 15 whlch forms the pivotal connection between the adjusting member 13 and the block 12, and the other end of the spring is connected to the block 12, so that if unrestrained the switch member will assume the open position.
  • the thermostatic latch 16 is provided in order to restrain the switch member in the closed position. The free end of the latch is arranged to abut against the slider 17 which is secured to the block 12 which carries the switch member 10.
  • the thermostatic latch 16 is heated in accordance with the current through one of the supply conductors of an electric translating device by means of the heating element 18 which is preferably although not necessarily, a strip of electric resistance material and which may be either directly included in one of the conductors of the supply circuit controlled by the electric switch or may be heated by a current proportional to the current in the conductor of the supply circuit, as will be understood by those skilled in the art.
  • the heating element 18 which is preferably although not necessarily, a strip of electric resistance material and which may be either directly included in one of the conductors of the supply circuit controlled by the electric switch or may be heated by a current proportional to the current in the conductor of the supply circuit, as will be understood by those skilled in the art.
  • the switch member 11 is carried by an insulatingblock 19which is similar to the insulating block 12 and this switch member is also biased out of engagement with the switch member 10 b means of the spring 20.
  • a portion of the b ock 19 has been broken away to show the manner in which the switch members 10 and 11 may be adjusted so as to vary the settinJg of the thermal responsive switch.
  • the adjusting member 21 is pivotally mounted at 22 in the insulating base 23, and this member carries a pin 24 which is disposed between the pivot 22 and the end of the adjusting member. This pin 24 provides a pivotal connection for the switch member 11, and by reason of the fact that the pin is no i adjacent the pivotal support 22 and between cuit of the line contactor 39.
  • the construction and arranlgement of the adjusting device for the switch member 10 is identical with that previously described in con nection with the adjusting device for the switch member 11.
  • the thermostatic latch 26 is arranged to be heated by the heater 30 which may either be included in one'of the conductors of an electric circuit or a translating device, or may be connected so that only a proportional part of the current in the supply circuit conductor passes through the heater.
  • a sin le device 31 is provided for cooperating with the insulating blocks 12 and 19 for manually reclosing the switch after it has been opened in response to the heating effect of the current in an electric circuit.
  • the resetting device may take various forms, and I have merely indicated one by way of illustration.
  • the resetting device comprises a cross-bar 32 which is carried by a pin 33 which is resiliently held by the spring 34: in a position with respect to the support 35 so that the cross-bar 32 is out of engagement with the insulating blocks 12 and 19.
  • the rod 33 may be moved against the action of v the spring 3& so as to thereby bring the cross-bar 32 into engagement with either one or both of the insulating blocks 12 and 19 so as to return the switch contacts 10 and 11 to their respective closed position.
  • the translating device which is protected by means of my improved thermal responsive switch is shown as an alternating current motor 37, which is adapted to be connected to the three-phase source of supply 38 by means of the line contactor 39.
  • the heater 30 is included in one of the supply conductors for the motor and the heater 18 is included in another of the supply conductors of the motor.
  • the thermalresponsive switch is shown as in the closed circuit-completing position, and it will be observed that the switch contacts are included in the coil cir- "upon the nature of the unbalancing of in their respective positions shown in this drawing, in order to start the motor, the push button 40 will first be closed, thereby completing a circuit forthe coil of the line contactor through the start push button 40, the stop push button 41, coil of the line cont actor, switch contact members 10 and 11 to the middle of the supply conductorsof the three-phase source of supply. The line contactor will close and establish a maintaining circuit for its coil through the auxiliary switch 42 so that the start push button 40 may be released.
  • thermostatic latches 26 and 16 will be fiexedupwardly out of engagement with their respective sliders 25 and 17 so that these switch members will be automatically released to open quickly in accordance with their bias, thereby giving the switch members and separating the switch contacts carried by the switch members 10 and 11 by a considerable distance a snap action to the opening ofand disrupting quickly any arcs which tend I to form at the thermal switch contacts.
  • either one of the thermostatic latches will operate, dependitrlllge currents in the respective supp-1y conductors, so that at least one of the switch members of the thermal responsive switch will be automatically released so as ance with its bias and thus effect the opening of the line contactor 39. It will also be observed that in case any one of the supply conductors is opened. the motor is protected from conditions caused by overheating when running single-phase.
  • a pivotallv' 1 in accordance with its bias, a pivotallv' 1.
  • a flexible thermostatic latch secured at one end with the free end thereof arranged to cooperate with the switch member to hold the same in the closed position, the said latch adapted to be flexed responsively to the heating effect of an electric current so that the free end of the latch releases the switch member to move to the open position the switch members in circuit closing engagement, means heated in accordance with the current of one conductor of a supply circuit for the translating device for eating one of said latches to release its corresponding switch member in accordance with the heating effect of the current in the said conductor, and means heated in accordance with the current in another conductor of the supply circuit for heating the other thermostatic latch to release its corresponding switch member in accordance with the heating eflect of the current in the other supply circuit conductor.
  • a thermostatic latch for each switch member for holding the switch members in cireuitclosing position, means heated in accordance with the current in one conductor of a supply circuit .
  • the translating device for heating one of said latches to release its corresponding switch member in accordance with the heating of the current in the said conductor means heated in accordance with the current in another conductor of the supply circuit for heating the other thermostatic latch to release its corresponding switch member in accordance with the heating effect of the current in the other supply conductor, and a single device cooperating with the said switch members for returning the switch members into engagement with each other.
  • each of said latches secured at one end with the free end thereof arranged to cooperate with its corresponding switch member to hold the same in the closed position, each of said latches adapted to be flexed responsively to the heating effect of the current in a separate conductor of a supply circuit for a translating device so that the free end of the latch releases its corresponding switch member to move to the open position in accordance with its bias, separate pivotal supports for the said switch members, separate adjusting members for individually shifting the said pivotal supports with respect to their corresponding thermostatic latches, and a single device adapted to cooperate with the said switch members for returning the same into engagement with each other.

Landscapes

  • Breakers (AREA)
  • Thermally Actuated Switches (AREA)
US611394A 1923-01-08 1923-01-08 Thermal responsive switch Expired - Lifetime US1527645A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR575271D FR575271A (enrdf_load_html_response) 1923-01-08
US611394A US1527645A (en) 1923-01-08 1923-01-08 Thermal responsive switch
GB547/24A GB209436A (en) 1923-01-08 1924-01-08 Improvements in and relating to thermal responsive switches

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US611394A US1527645A (en) 1923-01-08 1923-01-08 Thermal responsive switch

Publications (1)

Publication Number Publication Date
US1527645A true US1527645A (en) 1925-02-24

Family

ID=24448844

Family Applications (1)

Application Number Title Priority Date Filing Date
US611394A Expired - Lifetime US1527645A (en) 1923-01-08 1923-01-08 Thermal responsive switch

Country Status (3)

Country Link
US (1) US1527645A (enrdf_load_html_response)
FR (1) FR575271A (enrdf_load_html_response)
GB (1) GB209436A (enrdf_load_html_response)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2526861A (en) * 1946-02-28 1950-10-24 Trumbull Electric Mfg Co Electric relay unit
US2738396A (en) * 1952-01-17 1956-03-13 Belling & Lee Ltd Thermally operated circuit breakers
US2860211A (en) * 1956-08-10 1958-11-11 Controls Co Of America Electric switches

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2526861A (en) * 1946-02-28 1950-10-24 Trumbull Electric Mfg Co Electric relay unit
US2738396A (en) * 1952-01-17 1956-03-13 Belling & Lee Ltd Thermally operated circuit breakers
US2860211A (en) * 1956-08-10 1958-11-11 Controls Co Of America Electric switches

Also Published As

Publication number Publication date
FR575271A (enrdf_load_html_response) 1924-07-26
GB209436A (en) 1925-01-01

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