US1806443A - Thermal release device - Google Patents

Thermal release device Download PDF

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Publication number
US1806443A
US1806443A US328811A US32881128A US1806443A US 1806443 A US1806443 A US 1806443A US 328811 A US328811 A US 328811A US 32881128 A US32881128 A US 32881128A US 1806443 A US1806443 A US 1806443A
Authority
US
United States
Prior art keywords
drum
wire
thermal release
heating
release device
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
US328811A
Other languages
English (en)
Inventor
Besag Ernst
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.)
Schiele & Bruchsaler Ind
Schiele & Bruchsaler Industriewerke AG
Original Assignee
Schiele & Bruchsaler Ind
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 Schiele & Bruchsaler Ind filed Critical Schiele & Bruchsaler Ind
Application granted granted Critical
Publication of US1806443A publication Critical patent/US1806443A/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
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/14—Electrothermal mechanisms
    • H01H71/20—Electrothermal mechanisms with fusible mass
    • H01H71/205—Electrothermal mechanisms with fusible mass using a ratchet wheel kept against rotation by solder

Definitions

  • thermal release devices in which a heating wire on a definite current strength being reached causes a fusible mass to soften after expiry of a definite interval of time as a result of which a toothed rotatable element of the release deviceisreleased and a spring controlled pawl moves out of engagement with the toothed portion and by its movement effects a release of the switch.
  • Known releasing devices of this kind are comparatively complicated and require. comparatively high heating energy, namely 1 or 2 watts and moreover suffer from the dis advantage that even although built to the same dimensions no two devices release after the same time interval with a given current strength.
  • a rotatable hollow body filled with fusible material is directly mounted on the heating body, at least a part of which is in the form of a wire and a portion of which extends radially within the hollow body.
  • Fig. 1 illustrates a release device in wh1ch the heating wire has the shape of a crank shaft and Fig. 2 is a section on the line AB of Fig. 1. Fig. 3 shows a thermal release device of a preferred construction.
  • the heating wire 1 carries a drum 2 or other hollow body which is formed or provided with teeth 3.
  • The'interior 4 of the drum 2 is filled with a fusible mass preferably an eutectic alloy.
  • the walls bounding the space 4 are made other than cylindrical so that the drum 2 cannot rotate when the fusible mass is in cold condition.
  • the heating wire 1 reaches a definite temperature the mass i melted and the drum 2 is free to rotate.
  • a portion of the heating wire 1 formed as a crank shaft describing a surface of revolution within the fused material.
  • the heating wire 1 is shaped as a crank shaft the cranked portion of which has been twisted through 90.
  • a resistance wire In a thermal release, a resistance wire, a drum directly supported thereon, the resistance wire extending therethrough, fusible material filling said drum, the wire having a radially directed portion, the said material embedding the portion of the wire which is within the drum and also the said radially directed portion thereof, whereb to normally prevent rotation of the rum and whereby the fusing'of the said material by heating of the wire upon the passage of an abnormally high current will permit the rotation of the drum.
  • a substantially unitary resistance wire a drum directly supported thereon, the resistance wire extending therethrough, fusible material filling said drum, the portion of the wire which is within the drum being formed to provide a cranked radially directed portion, the said material embedding the said portion of the wire which is within the drum and also the said cranked radially directed portion there-1 4.
  • a resistance wire In a thermal release, a resistance wire,
  • the said resistance wire extending through the said drum, the portion of the said wire which is within the drum being iormed with a substantially U-shaped off set portion and having the said lattervportion disposed in a plane substantially at right angles to the axis of that portion of the resistance wire which extends within the drum, whereby to normally prevent rotation of the drum and whereby the fusing of the said material by heating of the wire upon the passage of an abnormally high current will permit the rotation of the drum.

Landscapes

  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
US328811A 1927-12-28 1928-12-27 Thermal release device Expired - Lifetime US1806443A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE303118X 1927-12-28

Publications (1)

Publication Number Publication Date
US1806443A true US1806443A (en) 1931-05-19

Family

ID=6109873

Family Applications (1)

Application Number Title Priority Date Filing Date
US328811A Expired - Lifetime US1806443A (en) 1927-12-28 1928-12-27 Thermal release device

Country Status (3)

Country Link
US (1) US1806443A (cs)
GB (1) GB303118A (cs)
NL (1) NL27563C (cs)

Also Published As

Publication number Publication date
GB303118A (en) 1929-11-28
NL27563C (cs)

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