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GB810237A - Improvements in or relating to electrical keyboard switches - Google Patents

Improvements in or relating to electrical keyboard switches

Info

Publication number
GB810237A
GB810237A GB27342/56A GB2734256A GB810237A GB 810237 A GB810237 A GB 810237A GB 27342/56 A GB27342/56 A GB 27342/56A GB 2734256 A GB2734256 A GB 2734256A GB 810237 A GB810237 A GB 810237A
Authority
GB
United Kingdom
Prior art keywords
spring
lever
slot
contacts
sept
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
GB27342/56A
Inventor
Leonard William Descarri Sharp
Kenneth Edmund Newman
Robert Stanley Wright
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.)
GE Healthcare UK Ltd
Plessey Co Ltd
Original Assignee
GE Healthcare UK Ltd
Plessey Co Ltd
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 GE Healthcare UK Ltd, Plessey Co Ltd filed Critical GE Healthcare UK Ltd
Priority to GB27342/56A priority Critical patent/GB810237A/en
Priority to US680362A priority patent/US2866860A/en
Priority to DEP19246A priority patent/DE1089851B/en
Priority to FR1182034D priority patent/FR1182034A/en
Publication of GB810237A publication Critical patent/GB810237A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/24—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
    • H03J5/26—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection operated by hand
    • H03J5/32—Stationary tuning circuits or elements selected by push-button

Landscapes

  • Push-Button Switches (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)

Abstract

810,237. Key-operated switches. PLESSEY CO. Ltd. Sept. 6, 1957 [Sept. 6, 1956], No. 27342/56. Class 38 (5). A lever-operated switch has a longitudinal blade spring 7 which both urges the lever 2 to its normal position and guides the lever at a point distant from its pivot axis 3. Thus as shown the spring 7 is attached by a screw to a boss 5c on the base member 5 and a slot 7a in the spring guides a projection 2a on the lever. The fixed contacts 9a are mounted on a board 9 whose lower end is positioned by an extension 7b of the spring and the moving contacts 10a are mounted on a board 10 having ribs guided in notches in the spring extension so that by removal of the holding screw and the spring both sets of contacts are released. In another form, Figs. 4-6 (not shown), the switch has a curved lever which is guided at its outer end by a slot in a bent blade spring. Part of the lever projects through a clearance slot in the spring.
GB27342/56A 1956-09-06 1956-09-06 Improvements in or relating to electrical keyboard switches Expired GB810237A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB27342/56A GB810237A (en) 1956-09-06 1956-09-06 Improvements in or relating to electrical keyboard switches
US680362A US2866860A (en) 1956-09-06 1957-08-26 Electrical switches
DEP19246A DE1089851B (en) 1956-09-06 1957-09-04 Electric switch with a push button lever
FR1182034D FR1182034A (en) 1956-09-06 1957-09-05 Electric switch with control buttons

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB27342/56A GB810237A (en) 1956-09-06 1956-09-06 Improvements in or relating to electrical keyboard switches

Publications (1)

Publication Number Publication Date
GB810237A true GB810237A (en) 1959-03-11

Family

ID=10258020

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27342/56A Expired GB810237A (en) 1956-09-06 1956-09-06 Improvements in or relating to electrical keyboard switches

Country Status (4)

Country Link
US (1) US2866860A (en)
DE (1) DE1089851B (en)
FR (1) FR1182034A (en)
GB (1) GB810237A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3006333A (en) * 1959-07-22 1961-10-31 Henry W Niemann Oven ventilation

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US700906A (en) * 1901-09-16 1902-05-27 Charles Edwards Type-writing clavier.
DE697678C (en) * 1938-07-31 1940-10-19 Heller Geb Device for determining the drilling pressure in radial drilling machines
US2599323A (en) * 1951-04-18 1952-06-03 F & B Mfg Co Contact arm for distributor breaker plates
DE1709887U (en) * 1954-10-23 1955-11-03 Philips Patentverwaltung PUSH BUTTON DEVICE.

Also Published As

Publication number Publication date
FR1182034A (en) 1959-06-22
US2866860A (en) 1958-12-30
DE1089851B (en) 1960-09-29

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