GB684444A - Improvements in or relating to a centrifugally-actuated snap-action device - Google Patents

Improvements in or relating to a centrifugally-actuated snap-action device

Info

Publication number
GB684444A
GB684444A GB31373/50A GB3137350A GB684444A GB 684444 A GB684444 A GB 684444A GB 31373/50 A GB31373/50 A GB 31373/50A GB 3137350 A GB3137350 A GB 3137350A GB 684444 A GB684444 A GB 684444A
Authority
GB
United Kingdom
Prior art keywords
arm
support
snap
springs
weight
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
GB31373/50A
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.)
Garrett Corp
Original Assignee
Garrett Corp
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 Garrett Corp filed Critical Garrett Corp
Publication of GB684444A publication Critical patent/GB684444A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H35/00—Gearings or mechanisms with other special functional features
    • F16H35/14—Mechanisms with only two stable positions, e.g. acting at definite angular positions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/06—Switches operated by change of speed
    • H01H35/10—Centrifugal switches

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • One-Way And Automatic Clutches, And Combinations Of Different Clutches (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)
  • Percussion Or Vibration Massage (AREA)

Abstract

684,444. Centrifugal switches. GARRATT CORPORATION. Dec. 27, 1950 [Dec. 31, 1949], No. 31373/50. Class 38 (v) [Also in Groups XXIV, XXVI and XXIX] A centrifugally-actuated snap-action switch comprises a rotatable support, a snap-acting arm pivoted to the support to one side of the support axis and extending across said axis, and carrying a weight at its free end, two spaced stops limiting movement of the arm longitudinally of the axis, and yielding means connected to the arm and the support and applying a force biasing the arm towards one of the stops, the axis making an angle of less than 90 degrees with a line passing through the pivot of the arm and the combined centre of gravity of the arm and the weight. The support 33 is attached to a shaft 22 rotated through gears 23, 26 by the controlled apparatus, and comprises a trifurcated blade spring, the central tension arm 40 of which is mounted on a screw 42 and the outer limbs 51 of which engage in notches 53 in a part 48 of the support 33. The arm 40 is normally urged by the springs 51 against a stop 47 on the support 33 and carries the weight 55. At a predetermined speed, the centrifugal force of the weight just overbalances the force of springs 51 and the arm 40 snaps clockwise until it abuts a stop 46, which is preferably placed so that the blade spring cannot move over-centre, an insulating plunger 71 being pushed to the left to close switch contacts 60, 61, during the snap movement. The contacts re-open when the speed falls below a certain minimum value, the springs 51 restoring the arm 40 with a snap action. The predetermined speed may be adjusted by moving screw 42 in or out to alter the pivot of arm 40, and/or by shifting springs 51 from one pair of notches 53 to another. In a modification, Fig. 7 (not shown), a coil spring is arranged between the casing 17 and an extension of the blade 59 carrying the contact 61, the stress on the spring being adjustable by a screw to vary the predetermined speed.
GB31373/50A 1949-12-31 1950-12-27 Improvements in or relating to a centrifugally-actuated snap-action device Expired GB684444A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US684444XA 1949-12-31 1949-12-31

Publications (1)

Publication Number Publication Date
GB684444A true GB684444A (en) 1952-12-17

Family

ID=22082622

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31373/50A Expired GB684444A (en) 1949-12-31 1950-12-27 Improvements in or relating to a centrifugally-actuated snap-action device

Country Status (1)

Country Link
GB (1) GB684444A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2186638A (en) * 1986-02-05 1987-08-19 Howden James & Co Ltd Wind turbines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2186638A (en) * 1986-02-05 1987-08-19 Howden James & Co Ltd Wind turbines

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