US1923509A - Electrothermally actuated electrical switch - Google Patents

Electrothermally actuated electrical switch Download PDF

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Publication number
US1923509A
US1923509A US463506A US46350630A US1923509A US 1923509 A US1923509 A US 1923509A US 463506 A US463506 A US 463506A US 46350630 A US46350630 A US 46350630A US 1923509 A US1923509 A US 1923509A
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United States
Prior art keywords
contacts
wires
winding
supports
vacuum
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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
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US463506A
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English (en)
Inventor
Rozumek Ernst
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Individual
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Individual
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Publication date
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Publication of US1923509A publication Critical patent/US1923509A/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/46—Thermally-sensitive members actuated due to expansion or contraction of a solid
    • H01H37/50—Thermally-sensitive members actuated due to expansion or contraction of a solid with extensible wires under tension

Definitions

  • the object of the present invention represents an essential improvement, consisting therein, that the load of the controlling contacts is non-inductive, the period of acting very short and finally, that the intensity of the controlling current and controlling power is very low.
  • a very fine wire possessing as high a thermic coefficient of expansion as possible, is so wound up in several long stretched windings, that the separate windings uniformly expand under the influence of the heat of the current and that each winding is made to act upon the contacts to be actuated with the same tensile force.
  • the total resistance of these windings electrically connected in series may, at the same time, easily be so adjusted, that the winding, if necessary using a series resistance for that purpose, allows of being immediately connected with the existing voltage of the system.
  • Fig. 1 represents a thermically controlled switch in accordance with the invention in front view.
  • Fig. 2 is a lateral view of the inner parts of same.
  • Fig. 3 shows a switch of a somewhat modified form of construction, partly in section.
  • Fig. 4 is a top view of the inner parts shown in Fig. 3, and
  • Fig. 5 is a longitudinal sectional view of a switch in accordance with another form of construction
  • Fig. 6 is a fragmentary section of a switch in accordance with a further form of construction.
  • a bus-bar 1 is made to support the fixed contact 2.
  • a spring 4 has been attached, the elasticity of which is pressing the movable contact 5, fastened thereto, in an upward direction.
  • the expansion-wire 6 is wound over 2 rolls 7 and 8 consisting of an insulating material.
  • the roll 7 is attached to the bus-bar l by means of the stirrup 11.
  • the roll 8 has been suspended to the contact-spring 4 by means of the stirrup '12.
  • the expansion winding 6 has been so connected, that, when being in a cold state, it closes the contacts 2 and 5.
  • the tensile force exercised by the spring 4 is the sum of the separate tensile forces of the separate Wires of the winding. Although utilizing very fine wires, the tensile force exercised is strong enough to guarantee a reliable and safe working.
  • the resistance of the total winding is so high in conjunction therewith, that the winding, if necessary using a small series resistance for that purpose, allows of being immediately connected with the existing voltage of the system.
  • the parts of the switch are suitably enclosed in a vessel, e. g. of glass, as indicated at A, which has been evacuated or charged with an indifferent gas.
  • 1a and 3a indicate lead-in wires for the bars 1 and 3 and 9 and 10 indicate lead-in wires for the expansion wire 6, the several wires 1a. and 3a, 9 and 10 being sealed in the wall of the vessel A.
  • Figs. 3 and 4 represent another form of construction, in which the winding 13 has been placed round the contacts 16 and 17 concentrically in long zigzag windings or turns by means of the two winding-supports 14 and 15.
  • One contact 16 is provided with a screw whereby the winding wires 13 are so tensioned that the contacts 16, 1'7 touch eachother in the unheated state of their windings.
  • a guiding member 31a is inserted in a tube 31 for the movable contact 16.
  • a spring 18 is inserted between the said guiding member and the nut 15a.
  • Conducting members 16a, 17a, 13a, 13b are 1 provided, which penetrate the vacuum-tight tatable small rolls.
  • This arrangement embodies the advantage, particularly in conjunction with the employment of vacuum-switches, that it adapts itself very well to the form of the glass-tube, in which these switches are usually enclosed.
  • FIG. 5 A further form of construction has been shown in Fig. 5.
  • the expansion-winding 19 is wound over a strip 22 in its longitudinal direction by means of two insulating rolls 20 and 21.
  • the separate windings or turns are held under tension through the medium of the contact-springs 25 and 26, simultane ously interpolating two insulating pieces 23 and 24.
  • a vacuum-tight closed vessel A encloses all parts.
  • Conducting members 25a, 26a, and 19a, 19b are passed through the vessel A.and lead the current to the contacts 2'7 and 28 and to the winding 19 of the resistance wire, respectively. If there is no current in the winding, the contacts 2'7 and 28 will be closed. If the winding is subjected to heat, the separate wires will be made to expand, thereby causing the contacts to open.
  • This arrangement possesses the advantage, that the expansion through heat of the separate wires may be transferred to the contacts in any desired multiplication.
  • the pin-screw 29 is made to serve in this case as a point-like support and simultaneously renders it possible to adjust the winding.
  • the numeral 30 in Fig. 1 shows an example of arrangement of such a screen, which may be made to consist of. an insulating material or of a conducting material, if desired.
  • the distance tube 31 used in, the construction simultaneously assumes the functions of a screen.
  • the movable insulating roll carries one of the ends of the expansion winding 3'7.
  • the heating of the winding corresponds to a closing of the contacts.
  • the arrangement should be suitably such, that between the point of suspension of the winding and the'movable contact an elastic member is interpolated, capable of still yielding a little, when the contacts have already been closed.
  • a material is suitably taken which possesses a low thermic coefiicient of expansion.
  • the object of the present invention is not confined to the examples of performance referred to; they represent, as a matter of fact, only a few suggested constructions.
  • An electro-thermally actuated electric switch comprising in combination, mechanically parallel and electrically series connected resistance wires, supports maintaining said wires under tension, contacts secured to the supports, a vacuum-tight closed vessel enclosing the wires,
  • An electro-thermally actuated electric switch comprising in combination, mechanically parallel and electrically series connected resistance wires, supports maintaining said wires under tension, contacts secured to the supports, a vacuum-tight closed vessel enclosing the wires, supports and contacts and constituting a bearer for the latter, an insulating screen arranged between the wires and the contacts, and conducting members passing through the vacuum-tight closed vessel and leading the electric current to the resistance wires and the contacts.
  • An electro-thermally actuated electric switch comprising in combination, mechanically parallel and electrically series connected resistance wires, supports maintaining said wires under tension, contacts secured to the supports,
  • An electro-thermally actuated electric switch comprising'in combination, mechanically parallel and electrically series connected resistance wires, supports maintaining said wires under tension, contacts secured to the supports, a vacuum-tight closed vessel enclosing the wires, supports and contacts and constituting a bearer for the latter, a set screw acting on one of the supports of the wires and regulating the tension of the latter and the switch pathof the contacts, an insulating screen arranged between the wires and the contacts, and conducting'members passing through the vacuum-tight closed vessel and leading the electric current to the resistance wires and the contacts.
  • An electro-thermally 4 actuated electric switch comprising in combination, mechanically parallel and electrically series connected resistance wires, disc-shaped supports maintaining said wires under tension,.contacts secured to the wire supports, a cylindrical insulating screen arranged between the wires and the contacts, and conducting members passing through the vacuum-tight closed vessel and leading the electric current to the resistance wires and the contacts.
  • An electro-ther'mally actuated electric switch comprising in combination, mechanically parallel and electrically series connected resistance wires, disc-shaped supports maintaining said wires under tension, contacts secured to the wire supports, a cylindrical insulating screen arranged between the wires and the contacts, a vacuum-tight vessel enclosing the screen, supports, wires and contacts, and conducting members passing through the vacuum-tight closed vessel and leading the electric current to the resistance wires and the contacts.

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Thermally Actuated Switches (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
US463506A 1929-07-01 1930-06-24 Electrothermally actuated electrical switch Expired - Lifetime US1923509A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE354020X 1929-07-01
DE385283X 1930-03-18

Publications (1)

Publication Number Publication Date
US1923509A true US1923509A (en) 1933-08-22

Family

ID=31888927

Family Applications (1)

Application Number Title Priority Date Filing Date
US463506A Expired - Lifetime US1923509A (en) 1929-07-01 1930-06-24 Electrothermally actuated electrical switch

Country Status (4)

Country Link
US (1) US1923509A (xx)
BE (1) BE377134A (xx)
FR (1) FR698135A (xx)
GB (2) GB354020A (xx)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2644870A (en) * 1951-04-14 1953-07-07 Ira E Mccabe Electric switch of the mercury type
US2809253A (en) * 1952-11-28 1957-10-08 G V Controls Inc Electrical control devices
US3004129A (en) * 1958-07-14 1961-10-10 Sunbeam Corp Thermal responsive device
US3127489A (en) * 1962-04-16 1964-03-31 Frank J Wallace Thermally responsive switch
US3493910A (en) * 1966-12-16 1970-02-03 Penn Controls Hot wire type spring motor actuator for switches

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3025373A (en) * 1956-08-29 1962-03-13 Bryant Electric Co Relay

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2644870A (en) * 1951-04-14 1953-07-07 Ira E Mccabe Electric switch of the mercury type
US2809253A (en) * 1952-11-28 1957-10-08 G V Controls Inc Electrical control devices
US3004129A (en) * 1958-07-14 1961-10-10 Sunbeam Corp Thermal responsive device
US3127489A (en) * 1962-04-16 1964-03-31 Frank J Wallace Thermally responsive switch
US3493910A (en) * 1966-12-16 1970-02-03 Penn Controls Hot wire type spring motor actuator for switches

Also Published As

Publication number Publication date
GB385283A (en) 1932-12-22
GB354020A (en) 1931-08-06
BE377134A (xx)
FR698135A (fr) 1931-01-27

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