US2689889A - Light responsive relay - Google Patents

Light responsive relay Download PDF

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Publication number
US2689889A
US2689889A US277660A US27766052A US2689889A US 2689889 A US2689889 A US 2689889A US 277660 A US277660 A US 277660A US 27766052 A US27766052 A US 27766052A US 2689889 A US2689889 A US 2689889A
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US
United States
Prior art keywords
plates
plate
light responsive
relay
responsive relay
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
US277660A
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English (en)
Inventor
Berglund Nils Olof Helmer
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.)
Svenska AB Gasaccumulator
Original Assignee
Svenska AB Gasaccumulator
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 Svenska AB Gasaccumulator filed Critical Svenska AB Gasaccumulator
Application granted granted Critical
Publication of US2689889A publication Critical patent/US2689889A/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
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/38—Radiation pyrometry, e.g. infrared or optical thermometry using extension or expansion of solids or fluids
    • G01J5/40—Radiation pyrometry, e.g. infrared or optical thermometry using extension or expansion of solids or fluids using bimaterial elements

Definitions

  • a contact device is adapted to be actuated in response to variations in the distance between the plates.
  • the plates are disposed to bend in the same direction, whereby the distance between the plates remains constant as long as the dilference in temperature between them is constant.
  • the switch is preferably disposed between the plates and attached to one plate at its midpoint in such a manner that its operating knob may respond to pressure from the other plate. However, it may also be positioned on the outside of a plate, the actuating force being applied by means of a rod connected to the other plate.
  • reference numerals l and 2 designate a pair of parallel bimetal plates.
  • the plates are supported at the corners on points 3 and are pressed against the points in any suitable way, for instance, as indicated in Fig. 1, by means of a clamp 4 provided with an adjustable screw pressing the plates I and 2 against the points 3.
  • the points 3 and, in the illustrated embodiment, the clamps 4 are attached to distance pieces 9, whereby the spacing between the plates is maintained constant at the corners. In the interest of clarity only one of the clamps 4 has been illustrated.
  • the plates are arranged to bend in the same direction, for instance downwardly, upon a rise in temperature. As long as the plates have the same temperature the distance between their midpoints is therefore constant. If however one of the plates is more light-absorptive than the other and the plates are exposed to light, the more light-absorptive one of the plates will take on a somewhat higher temperature than the other plate. As a result, the distance between the midpoints of the plates changes and this change can be utilized for actuating a contact device.
  • the plate I is more light-absorptive than the plate 2. It may for instance be a dull black and the plate 2 white or polished. When light is thrown on the plates, the plate I is therefore brought to a somewhat higher temperature than the plate 2 and is therefore bent more outward than the plate 2.
  • the contact device 5 which is to be actuated by the bimetal plates comprises a microswitch, which is of such a construction that the operating knob 6 thereof need only be displaced by a few tenths of a millimetre in order for the switch to operate.
  • the operating force required is of the order of a few hundreds of grams.
  • the operating knob 6 is actuated by a screw 1 passing through a bushing 8 at the midpoint of the plate I.
  • the screw may be locked in any suitable way in its adjusted position. Adjustment should be made for the contact to be closed when the relay is in darkness or the illumination is below a predetermined value.
  • each spring may be parallel with an edge of the plates. Owing to the springs In each one of the spacers is free to swing toward one of the adjacent spacers whereby the spacers are free to adapt themselves to the changes in distance between the corners of a plate that may occur in actual operation.
  • one or both plates may be associated with springs tending to increase or decrease the bending thereof in response to variations in ambient temperature.
  • a spring l2 of this kind is shown connected between the midpoint of one of the plates and the base I3.
  • the whole arrangement should preferably be encased in a transparent housing of glass, plastic material or the like.
  • a light responsive relay comprising, a pair of substantially parallel and rectangular bimetal plates having different light-absorbing characteristics, plate mounting members for supporting said plates at a plurality of points at the edges thereof, said mounting members being individually movable in a direction parallel to said plates, and a switch having two contact members, one contactmember being attached to the midpoint of one of said plates and the other contact mem-- ber being attached to the midpoint of the other of said plates, said switch being actuated through differential displacement of said plates.
  • each one of said mounting members is supported by a leaf spring parallel with an edge of one of said plates thereby permitting movement of said one mounting member toward an adjacent mounting member.
  • a relay according to claim 1 comprising a spring attached to .one of said plates for changing the eifective resiliency thereof so as to provide substantially the same resiliency for both of said plates, whereby a predetermined temperature variation will cause substantially the same amount of bending of both plates.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Thermal Sciences (AREA)
  • Thermally Actuated Switches (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
US277660A 1951-03-20 1952-03-20 Light responsive relay Expired - Lifetime US2689889A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE702588X 1951-03-20

Publications (1)

Publication Number Publication Date
US2689889A true US2689889A (en) 1954-09-21

Family

ID=20315515

Family Applications (1)

Application Number Title Priority Date Filing Date
US277660A Expired - Lifetime US2689889A (en) 1951-03-20 1952-03-20 Light responsive relay

Country Status (4)

Country Link
US (1) US2689889A (fr)
FR (1) FR1052504A (fr)
GB (1) GB702588A (fr)
NL (1) NL76283C (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3618970A1 (de) * 1986-06-05 1987-12-10 Odo Dipl Ing Thom Differenz-thermostat

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB178254A (en) * 1921-02-15 1922-04-20 Gen Electric Improvements in and relating to photosensitive devices
US1461523A (en) * 1922-09-15 1923-07-10 American Gasaccumulator Co Light-controlled means for opening and closing an electric circuit
US2063997A (en) * 1930-10-22 1936-12-15 Safety Car Heating & Lighting System and apparatus for circuit controlling
US2367059A (en) * 1941-02-10 1945-01-09 Penn Electric Switch Co Burner control system
US2598808A (en) * 1948-04-24 1952-06-03 Ledin Sven Harald Heating apparatus and radiation relay therefor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB178254A (en) * 1921-02-15 1922-04-20 Gen Electric Improvements in and relating to photosensitive devices
US1461523A (en) * 1922-09-15 1923-07-10 American Gasaccumulator Co Light-controlled means for opening and closing an electric circuit
US2063997A (en) * 1930-10-22 1936-12-15 Safety Car Heating & Lighting System and apparatus for circuit controlling
US2367059A (en) * 1941-02-10 1945-01-09 Penn Electric Switch Co Burner control system
US2598808A (en) * 1948-04-24 1952-06-03 Ledin Sven Harald Heating apparatus and radiation relay therefor

Also Published As

Publication number Publication date
FR1052504A (fr) 1954-01-25
NL76283C (fr)
GB702588A (en) 1954-01-20

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