GB536854A - Improved time-switching device for apparatus or machinery employing electric current - Google Patents

Improved time-switching device for apparatus or machinery employing electric current

Info

Publication number
GB536854A
GB536854A GB459440A GB459440A GB536854A GB 536854 A GB536854 A GB 536854A GB 459440 A GB459440 A GB 459440A GB 459440 A GB459440 A GB 459440A GB 536854 A GB536854 A GB 536854A
Authority
GB
United Kingdom
Prior art keywords
shaft
lever
arm
switching device
clockwork
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
GB459440A
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.)
DONALD RALPH CRANHAM
RICHARD LEY ALKIN
Original Assignee
DONALD RALPH CRANHAM
RICHARD LEY ALKIN
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 DONALD RALPH CRANHAM, RICHARD LEY ALKIN filed Critical DONALD RALPH CRANHAM
Priority to GB459440A priority Critical patent/GB536854A/en
Publication of GB536854A publication Critical patent/GB536854A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F3/00—Apparatus which can be set and started to measure-off predetermined or adjustably-fixed time intervals with driving mechanisms, e.g. dosimeters with clockwork
    • G04F3/02—Apparatus which can be set and started to measure-off predetermined or adjustably-fixed time intervals with driving mechanisms, e.g. dosimeters with clockwork with mechanical driving mechanisms
    • G04F3/027—Apparatus which can be set and started to measure-off predetermined or adjustably-fixed time intervals with driving mechanisms, e.g. dosimeters with clockwork with mechanical driving mechanisms using electrical contacts, e.g. for actuating electro-acoustic device

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)

Abstract

536,854. Time switches. ALKIN R. L., and CRANHAM D. R. March 12, 1940, No. 4594. [Class 38 (v)] In a switching device adapted to close a circuit for a pre-determined time, setting for the desired time is first effected by rotation of a shaft j, provided with knob and dial, through a predetermined angle, and a lever l is then rotated clockwise to turn a shaft k thereby moving a mercury switch mounted on the shaft into the " on" position and releasing the clockwork mechanism. In the form shown the shaft k carries a lever m n which carries an arm o normally engaging the fly p of the clockwork but moved away from it when the shaft k is rotated . The rotation also moves a pin m<1> so that it engages and is locked in a recess q' on a lever q, q<1> biassed by a spring s. After the pre-determined time has elapsed, an arm j' on the shaft j engages the arm q<1> and releases the lever m, n which returns to its original position operating the mercury switch " off." In a modification, the shaft j of the clockwork is held against rotation by a pawl lever engaging a ratchet wheel on the shaft.
GB459440A 1940-03-12 1940-03-12 Improved time-switching device for apparatus or machinery employing electric current Expired GB536854A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB459440A GB536854A (en) 1940-03-12 1940-03-12 Improved time-switching device for apparatus or machinery employing electric current

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB459440A GB536854A (en) 1940-03-12 1940-03-12 Improved time-switching device for apparatus or machinery employing electric current

Publications (1)

Publication Number Publication Date
GB536854A true GB536854A (en) 1941-05-29

Family

ID=9780100

Family Applications (1)

Application Number Title Priority Date Filing Date
GB459440A Expired GB536854A (en) 1940-03-12 1940-03-12 Improved time-switching device for apparatus or machinery employing electric current

Country Status (1)

Country Link
GB (1) GB536854A (en)

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