GB1383476A - Positioning device using negative spring-rate tensioning means - Google Patents

Positioning device using negative spring-rate tensioning means

Info

Publication number
GB1383476A
GB1383476A GB639073A GB639073A GB1383476A GB 1383476 A GB1383476 A GB 1383476A GB 639073 A GB639073 A GB 639073A GB 639073 A GB639073 A GB 639073A GB 1383476 A GB1383476 A GB 1383476A
Authority
GB
United Kingdom
Prior art keywords
recorder
strut
coil
wire
rotation
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
Application number
GB639073A
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.)
Schneider Electric Systems USA Inc
Original Assignee
Foxboro 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
Application filed by Foxboro Co filed Critical Foxboro Co
Publication of GB1383476A publication Critical patent/GB1383476A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
    • F03G7/00—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for
    • F03G7/06—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for using expansion or contraction of bodies due to heating, cooling, moistening, drying or the like
    • F03G7/065—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for using expansion or contraction of bodies due to heating, cooling, moistening, drying or the like using a shape memory element
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R17/00—Measuring arrangements involving comparison with a reference value, e.g. bridge

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)
  • Feedback Control In General (AREA)
  • Control Of Position Or Direction (AREA)
  • Rehabilitation Tools (AREA)
  • Recording Measured Values (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

1383476 Electric meters; recording apparatus FOXBORO CO 9 Feb 1973 [31 March 1972] 6390/73 Headings G1Q and G1J [Also in Division F2] An apparatus for positioning a member 76 includes an element 70 which changes dimensionally with temperature and a spring assembly 82, 90 which opposes any temperature-induced changes in the member 76 and whose opposing force reduces as the change increases. In a device for positioning a pen-recorder stylus the wire 70 contracts when heated inductively by a coil (80) Fig. 7 (not shown). The frequency of the coil signal is a function of the input voltage Fig. 11 (not shown). As the wire 70 contracts, member 76 is rotated about a flexible support 78 fixed to the recorder housing. Leaf spring 82 is fixed at one end 88 to the recorder housing and at the other places a strut 90 in compression. Strut 90 bears against member 76 at 92 and opposes the member 76 rotation. As the member 76 rotates, the angle it forms with strut 90 decreases and the opposing force thus decreases also. The rotation is coupled by pivot 102 and linkages 96-100 to a flexible support 104 on the housing. A spindle (110), Fig. 7 (not shown), is aligned with support 104 and connected to linkage 100. Rotation of the member 76 thus rotates the spindle (110) causing the pen-recorder stylus to be correctly positioned. If the stylus is subjected to external force e.g. by end-stops or operator error, spring 106 absorbs the energy, protecting the wire 70 from excessive stress. In the coil driver circuit, Fig. 11 (not shown), a differential amplifier has inputs from a potentiometer driven by member 76 and the input voltage. The amplifier output charges a capacitor which provides the bias voltage to transistor oscillator, thereby determining its frequency. The oscillator output drives the heating coil, until the two amplifier inputs are equal.
GB639073A 1972-03-31 1973-02-09 Positioning device using negative spring-rate tensioning means Expired GB1383476A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US23990672A 1972-03-31 1972-03-31

Publications (1)

Publication Number Publication Date
GB1383476A true GB1383476A (en) 1974-02-12

Family

ID=22904242

Family Applications (1)

Application Number Title Priority Date Filing Date
GB639073A Expired GB1383476A (en) 1972-03-31 1973-02-09 Positioning device using negative spring-rate tensioning means

Country Status (8)

Country Link
JP (1) JPS497683A (en)
AR (1) AR199288A1 (en)
CA (1) CA984901A (en)
DE (1) DE2313240C3 (en)
FR (1) FR2178941B1 (en)
GB (1) GB1383476A (en)
IT (1) IT980042B (en)
NL (1) NL7304478A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2612307A (en) * 2021-10-26 2023-05-03 Cambridge Mechatronics Ltd An actuator assembly

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51102789A (en) * 1975-03-07 1976-09-10 Matsushita Electric Ind Co Ltd SAABOKAIRO
US4197708A (en) * 1978-06-09 1980-04-15 Hochstein Peter A Thermal energy scavenger (alternating stress limiters)
US4197709A (en) * 1978-06-09 1980-04-15 Hochstein Peter A Thermal energy scavenger (stress limiter)
DE3236934A1 (en) * 1982-10-06 1984-04-12 Robert Bosch Gmbh, 7000 Stuttgart Apparatus for achieving optimum functional adaption of control devices when they are switched on again
DE3432134A1 (en) * 1983-09-01 1985-03-21 The Furukawa Electric Co., Ltd., Tokio/Tokyo DEVICE FOR SWIVELING A CONTROL LEVER
JPS6053676A (en) * 1983-09-01 1985-03-27 Furukawa Electric Co Ltd:The Crank swinging apparatus
JPS61178565A (en) * 1985-02-04 1986-08-11 Tokieda Naomitsu Actuator made of shape memory alloy

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2612307A (en) * 2021-10-26 2023-05-03 Cambridge Mechatronics Ltd An actuator assembly

Also Published As

Publication number Publication date
FR2178941B1 (en) 1976-09-10
JPS497683A (en) 1974-01-23
AR199288A1 (en) 1974-08-23
NL7304478A (en) 1973-10-02
CA984901A (en) 1976-03-02
FR2178941A1 (en) 1973-11-16
DE2313240A1 (en) 1973-10-11
IT980042B (en) 1974-09-30
DE2313240B2 (en) 1978-10-12
DE2313240C3 (en) 1979-06-13

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee