US2515152A - Switch mechanism adapted for use in a high-frequency heating system - Google Patents

Switch mechanism adapted for use in a high-frequency heating system Download PDF

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Publication number
US2515152A
US2515152A US684036A US68403646A US2515152A US 2515152 A US2515152 A US 2515152A US 684036 A US684036 A US 684036A US 68403646 A US68403646 A US 68403646A US 2515152 A US2515152 A US 2515152A
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Prior art keywords
disc
microswitch
temperature
switch mechanism
heating system
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US684036A
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Cecil C Fisher
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Raytheon Co
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Raytheon Manufacturing Co
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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00Details of electric heating devices
    • H05B1/02Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0202Switches
    • H05B1/0213Switches using bimetallic elements
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00Switches operated by change of a physical condition
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00Thermally-actuated switches
    • H01H37/02Details
    • H01H37/32Thermally-sensitive members
    • H01H37/52Thermally-sensitive members actuated due to deflection of bimetallic element
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00Thermally-actuated switches
    • H01H37/02Details
    • H01H37/32Thermally-sensitive members
    • H01H37/52Thermally-sensitive members actuated due to deflection of bimetallic element
    • H01H37/54Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting

Definitions

  • This invention relates to a switch mechanism
  • 'An object of this invention is to devise a tem :perature-responsive switch adapted for use in a high-frequency heating system.
  • Another. object is to devise a, thermal switch in which the temperature-responsive element 1 of said switch is adapted to be placed in a radiofrequency field, without any or the difficulties -ordinarily existing when the temperatures of radio-frequency fields are measured with con- -:ventional devices.
  • a further object is to devise a means for measuring temperatures under adverse conditions of high voltage and high frequency.
  • a still further object is to devise a. temperature simple and therefore inexpensive.
  • sulating material is fastened to member [3 by means of a threaded shank portion 18 at its upper end. which threadedly engages with a centrally- 1 located threaded recess 19 provided in the lower shut-off device responsive to radio-frequency conditions, which device is efiicient-yet relatively
  • two electrodes .l and 2 are connected, by means of conductors 33 and 3 to the output terminals 3! and 32 of a high-fr quency oscillator 3, for example, one whose output is in the radio-frequency range, the dielectric material 4 to be heated being placed between the two electrodes.
  • Electrode 2 is supported by a suitable supporting block 6, for example, of metal, which has an aperture 1 therein.
  • a bimetallic thermal-responsive disc 8 Adjacent the lower face of electrode 2, firmly attached thereto, and positioned in aperture 1, there is an intermediate piece or disc 5 of heattransmitting material, for example, of copper.
  • a bimetallic thermal-responsive disc 8 has a central aperature 9, through which a rivet [0 extends in order to firmly fasten the center of said disc to the central portion of the bottom surface of piece 5.
  • a cup-shaped member H is positioned centrally of disc 8 and piece 5, said member being of such diameter that its upstanding end engages the lower suriace of disc 8 near its periphery.
  • Aperture 1 is of sufficient diameter to freely accommodate disc 8, cup H, and piece 5.
  • Member i! is provided with a centrally-located longitudinally-extending bore 2B,.which is aligned with bore !4 when members l3 and I! are assembled and which is of sufficient diameter to allow free movement of rod 82 withrespect to member !I, rod [2 extending through bore 20 when members l3 and I! are Member I! has a grommet 2
  • Amicroswitch 22 having two electrical terminals 23 and 24, between which a circuit is made or broken by the operation of said microswitch, is mounted adjacent the lower end of member I l by means of a, supporting framework 25, for
  • microswitch 22 is held in position in framework 25 by means of a bolt 21 which threadedly engages said framework and contacts the body or container of said microswitch.
  • the microswitch ismounted in such position that the lower end of rod 1 2 engages, and is supported by, the actuating button 28 of said microswitch, so that vertical movement of the rod will actuate the microswitch and, at the same time, the microswitch will support rod l2 and cup II in position.
  • Oscillator 3 is provided with two control terminals 29 and 3t and these terminals are so connected into the circuit of said oscillator that, when an external circuit between said terminals is interrupted, said oscillator will be turned off.
  • Terminals 29 and 30 are connected, by means of conductors 35 and 36 respectively, to terminals 23 and 24, respectively, of the microswitch, so that, in response to operation of the microswitch, oscillator 3 may be turned on or ofi.
  • the thermal-responsive disc 8 at temperatures below the control temperature for which it is designed, has a curvature in the direction shown in the drawing, but it is adapted, when said control temperature is reached, to suddenly reverse its curvature.
  • the temperature of the electrode 2 is transmitted through piece of heat-conducting material to disc 8.
  • the elements At temperature below the shutofi or control temperature for which disc 8 is designed, the elements have the position shown in the drawing, with microswitch 22 closed and oscillator 3 turned on.
  • the device may be considered to be a temperature measuring device, because the temperature of the material 4 is transmitted to the disc 8, where it is measured as being above or below the control temperature. It will be noted that no electrical contact between the radio-frequency electrode and the temperature-responsive element is required, so that there is no possibility of arcing to the temperature-responsive element. Since the high-voltage portions of the system are electrically insulated, by means of rod 12 and member I 1 of dielectric material, from the microswitch itself, there is no possibility of the high voltage radiofrequency energy interferingwith the operation of the switch mechanism. It will therefore be seen that I have provided a temperature-responsive switch mechanism which is useful under adverse conditions of high voltage and high frequency, and which at the same time is relatively inexpensive.
  • a temperature-responsive switch mechanism for use in a high-frequency electrical system, comprising a thermal-responsive disc in heatconducting relation with a source of high-frequency electrical energy the temperature of which is to be measured, a cup-shaped member in engagement with said disc, an elongated insulating member attached to said member, a guiding member of insulating material surrounding said last-named member, and a remotely-located microswitch having an actuating element, said microswitch being supported directly from said guiding member and being so located that said actuating element is mechanically connected to said elongated member.
  • a high frequency electrical system comprising a pair of electrodes connected to be supplied with energy from an oscillator, means for supporting one of said electrodes, said means covering the exterior surface of said one electrode but being provided with an aperture which exposes a portion of the exterior surface of said one electrode, a thermal-responsive disc connected at its center to a metallic block positioned in said aperture and in heat-conducting relation with said one electrode, said disc moving in response to heating thereof, a remotely-located switch having an actuating element and a pair of terminals, insulating means mechanically coupling said disc to said element to transmit movements of said disc to said element, and means electrically connecting said terminals to said oscillator.

Description

Jul 11, 1950 c. c. FISHER 2,515,152 SWITCH MECHANISM ADAPTED FOR USE IN A HIGH-FREQUENCY HEATING SYSTEM Filed July 16, 1946 K A/ V7] 1\\\\\\\\&\\\ 2 INVENTOR CEG/L C. F/SHER Patented July 11, 1950 UNITED STAT'ESiiiPATENT (OFFICE SWITCH MECHANISM ADAPTED FOR USE IN A HIGH-FREQUENCY HEATING SYSTEM Cecil. C. Fisher, Lombard, Ill., assignor to Raytheon Manufacturing Company, Newton, Mass., a corporation of Delaware Application July 16, 1946, Serial No. 684,036
2 Claims.
This invention relates to a switch mechanism,
;' sulating material.
and more particularly to a switch which is adapted for use in a high-irequency, high-voltage system.
'An object of this invention is to devise a tem :perature-responsive switch adapted for use in a high-frequency heating system.
Another. object is to devise a, thermal switch in which the temperature-responsive element 1 of said switch is adapted to be placed in a radiofrequency field, without any or the difficulties -ordinarily existing when the temperatures of radio-frequency fields are measured with con- -:ventional devices.
A further object is to devise a means for measuring temperatures under adverse conditions of high voltage and high frequency.
A still further object is to devise a. temperature simple and therefore inexpensive.
The foregoing and other objects of the invention will be best understood from the following description. of anexemplification thereof, reference beinghad to the accompanying drawing, :lwherein the single figure is a vertical section through a device embodying the present in- .yvention.
sulating material is fastened to member [3 by means of a threaded shank portion 18 at its upper end. which threadedly engages with a centrally- 1 located threaded recess 19 provided in the lower shut-off device responsive to radio-frequency conditions, which device is efiicient-yet relatively Referring, now, to the drawing, two electrodes .l and 2 are connected, by means of conductors 33 and 3 to the output terminals 3! and 32 of a high-fr quency oscillator 3, for example, one whose output is in the radio-frequency range, the dielectric material 4 to be heated being placed between the two electrodes. Electrode 2 is supported by a suitable supporting block 6, for example, of metal, which has an aperture 1 therein. Adjacent the lower face of electrode 2, firmly attached thereto, and positioned in aperture 1, there is an intermediate piece or disc 5 of heattransmitting material, for example, of copper. A bimetallic thermal-responsive disc 8 has a central aperature 9, through which a rivet [0 extends in order to firmly fasten the center of said disc to the central portion of the bottom surface of piece 5. A cup-shaped member H is positioned centrally of disc 8 and piece 5, said member being of such diameter that its upstanding end engages the lower suriace of disc 8 near its periphery. Aperture 1 is of sufficient diameter to freely accommodate disc 8, cup H, and piece 5.
Firmly attached to the bottom of cup H, and supporting the same in position, is a, cylindrical elongated rod l2 of a suitable dielectric or inassembled.
end of member l3. Member i! is provided with a centrally-located longitudinally-extending bore 2B,.which is aligned with bore !4 when members l3 and I! are assembled and which is of sufficient diameter to allow free movement of rod 82 withrespect to member !I, rod [2 extending through bore 20 when members l3 and I! are Member I! has a grommet 2| mounted therein at its lower end for the purpose of guiding rod [2 in its vertical or longi- .tudinal movement.
. Amicroswitch 22, having two electrical terminals 23 and 24, between which a circuit is made or broken by the operation of said microswitch, is mounted adjacent the lower end of member I l by means of a, supporting framework 25, for
. example of metal, which is in firm engagement with the outer surface of the microswitch body or container and which is secured to member I! by mean of a bolt 2t which passes through a transverse aperture in member ll near the lower end thereof. Microswitch 22 is held in position in framework 25 by means of a bolt 21 which threadedly engages said framework and contacts the body or container of said microswitch. The microswitch ismounted in such position that the lower end of rod 1 2 engages, and is supported by, the actuating button 28 of said microswitch, so that vertical movement of the rod will actuate the microswitch and, at the same time, the microswitch will support rod l2 and cup II in position.
Oscillator 3 is provided with two control terminals 29 and 3t and these terminals are so connected into the circuit of said oscillator that, when an external circuit between said terminals is interrupted, said oscillator will be turned off. Terminals 29 and 30 are connected, by means of conductors 35 and 36 respectively, to terminals 23 and 24, respectively, of the microswitch, so that, in response to operation of the microswitch, oscillator 3 may be turned on or ofi.
The thermal-responsive disc 8, at temperatures below the control temperature for which it is designed, has a curvature in the direction shown in the drawing, but it is adapted, when said control temperature is reached, to suddenly reverse its curvature. The temperature of the electrode 2 is transmitted through piece of heat-conducting material to disc 8. At temperature below the shutofi or control temperature for which disc 8 is designed, the elements have the position shown in the drawing, with microswitch 22 closed and oscillator 3 turned on. When the control temperature is reached by the dielectric material 4 which is being heated by radio-frequency energy supplied from oscillator 3, this temperature is also reached by disc 8, causing said disc to suddenly reverse its direction of curvature, moving cup II and rod 12 downwardly to actuate microswitch 22 to its open position, thereby turning off oscillator 3 and stopping the supply of radio-frequency energy to material 4. This switch mechanism therefore acts as a temperature shutoff device or a temperaturelim iting switch to control the heat in a radiofrequency dielectric heating system.
Since disc 8 operates at a fixed temperature, the device may be considered to be a temperature measuring device, because the temperature of the material 4 is transmitted to the disc 8, where it is measured as being above or below the control temperature. It will be noted that no electrical contact between the radio-frequency electrode and the temperature-responsive element is required, so that there is no possibility of arcing to the temperature-responsive element. Since the high-voltage portions of the system are electrically insulated, by means of rod 12 and member I 1 of dielectric material, from the microswitch itself, there is no possibility of the high voltage radiofrequency energy interferingwith the operation of the switch mechanism. It will therefore be seen that I have provided a temperature-responsive switch mechanism which is useful under adverse conditions of high voltage and high frequency, and which at the same time is relatively inexpensive.
Of course, it is to be understood that this invention is not limited to the particular details as described above, as many equivalents will suggest themselves to those skilled in the art. It is accordingly desired that the appended claims be given a broad interpretation commensurate with the scope of this invention within the art.
What is claimed is:
l. A temperature-responsive switch mechanism for use in a high-frequency electrical system, comprising a thermal-responsive disc in heatconducting relation with a source of high-frequency electrical energy the temperature of which is to be measured, a cup-shaped member in engagement with said disc, an elongated insulating member attached to said member, a guiding member of insulating material surrounding said last-named member, and a remotely-located microswitch having an actuating element, said microswitch being supported directly from said guiding member and being so located that said actuating element is mechanically connected to said elongated member.
2. A high frequency electrical system, comprising a pair of electrodes connected to be supplied with energy from an oscillator, means for supporting one of said electrodes, said means covering the exterior surface of said one electrode but being provided with an aperture which exposes a portion of the exterior surface of said one electrode, a thermal-responsive disc connected at its center to a metallic block positioned in said aperture and in heat-conducting relation with said one electrode, said disc moving in response to heating thereof, a remotely-located switch having an actuating element and a pair of terminals, insulating means mechanically coupling said disc to said element to transmit movements of said disc to said element, and means electrically connecting said terminals to said oscillator.
' CECIL C. FISHER.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 2,044,397 Persons June 16, 1936 2,192,633 Beam Mar. 5, 1940 2,192,852 Hastings Mar. 5, 1940 2,239,540 Spencer Apr. 22, 1941 2,386,966 MacMillin Oct. 16, 1945 2,421,098 Vogt et a1 May 27, 1947 2,421,101 Lakso May 27, 1947
US684036A 1946-07-16 1946-07-16 Switch mechanism adapted for use in a high-frequency heating system Expired - Lifetime US2515152A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0917173A2 (en) * 1997-11-18 1999-05-19 Hans Arnhold Overcurrent trip unit for a circuit breaker

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2044397A (en) * 1933-10-16 1936-06-16 Penn Electric Switch Co Temperature responsive switch
US2192852A (en) * 1939-09-13 1940-03-05 Westinghouse Electric & Mfg Co Control for refrigerating apparatus
US2192633A (en) * 1937-10-08 1940-03-05 Bryant Heater Co Surface thermostat
US2239540A (en) * 1936-01-27 1941-04-22 Metals & Controis Corp Thermostatic control
US2386966A (en) * 1943-03-10 1945-10-16 Hydraulic Dev Corp Inc High-frequency electrostatic heating of plastics
US2421101A (en) * 1944-05-18 1947-05-27 Vogt Clarence W Apparatus for method for repair of tires
US2421098A (en) * 1943-12-16 1947-05-27 Vogt Repair of tires

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2044397A (en) * 1933-10-16 1936-06-16 Penn Electric Switch Co Temperature responsive switch
US2239540A (en) * 1936-01-27 1941-04-22 Metals & Controis Corp Thermostatic control
US2192633A (en) * 1937-10-08 1940-03-05 Bryant Heater Co Surface thermostat
US2192852A (en) * 1939-09-13 1940-03-05 Westinghouse Electric & Mfg Co Control for refrigerating apparatus
US2386966A (en) * 1943-03-10 1945-10-16 Hydraulic Dev Corp Inc High-frequency electrostatic heating of plastics
US2421098A (en) * 1943-12-16 1947-05-27 Vogt Repair of tires
US2421101A (en) * 1944-05-18 1947-05-27 Vogt Clarence W Apparatus for method for repair of tires

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0917173A2 (en) * 1997-11-18 1999-05-19 Hans Arnhold Overcurrent trip unit for a circuit breaker
EP0917173A3 (en) * 1997-11-18 1999-07-28 Hans Arnhold Overcurrent trip unit for a circuit breaker

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