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GB847851A - Improvements in key-operated electric switches - Google Patents

Improvements in key-operated electric switches

Info

Publication number
GB847851A
GB847851A GB3813657A GB3813657A GB847851A GB 847851 A GB847851 A GB 847851A GB 3813657 A GB3813657 A GB 3813657A GB 3813657 A GB3813657 A GB 3813657A GB 847851 A GB847851 A GB 847851A
Authority
GB
United Kingdom
Prior art keywords
key
removal
prevented
electric switches
operated electric
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
GB3813657A
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.)
JA Crabtree and Co Ltd
Original Assignee
JA Crabtree and 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 JA Crabtree and Co Ltd filed Critical JA Crabtree and Co Ltd
Priority to GB3813657A priority Critical patent/GB847851A/en
Publication of GB847851A publication Critical patent/GB847851A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H27/00—Switches operated by a removable member, e.g. key, plug or plate; Switches operated by setting members according to a single predetermined combination out of several possible settings
    • H01H27/06—Key inserted and then turned to effect operation of the switch
    • H01H27/08—Key inserted and then turned to effect operation of the switch wherein the key cannot be removed until the switch is returned to its original position

Landscapes

  • Handcart (AREA)

Abstract

847,851. Key-operated switches. CRABTREE & CO. Ltd., J. A., and MORGAN, R. W. Oct. 20, 1958 [Dec. 7, 1957], No. 38136/57. Class 38 (5). Undesired operation of a switch is prevented by the use of a removable metal key 4 whose hollow circular end engages in a narrow annular groove 2, formed on the outer surface of the pivoted insulating dolly 1. In a modification the switch cover 5 has inwardly extending ribs 7, which engage grooves in the key 4 to prevent its removal in the " on " position. By forming these ribs on the upper portion of the cover, removal of the key in the " off" position may be prevented.
GB3813657A 1957-12-07 1957-12-07 Improvements in key-operated electric switches Expired GB847851A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3813657A GB847851A (en) 1957-12-07 1957-12-07 Improvements in key-operated electric switches

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3813657A GB847851A (en) 1957-12-07 1957-12-07 Improvements in key-operated electric switches

Publications (1)

Publication Number Publication Date
GB847851A true GB847851A (en) 1960-09-14

Family

ID=10401433

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3813657A Expired GB847851A (en) 1957-12-07 1957-12-07 Improvements in key-operated electric switches

Country Status (1)

Country Link
GB (1) GB847851A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4359615A (en) * 1981-08-14 1982-11-16 Black & Decker Inc. Switch and means to prevent unauthorized operation thereof
US4524251A (en) * 1983-08-20 1985-06-18 K. A. Schmersal Gmbh & Co. Electrical switch
US4686339A (en) * 1986-02-24 1987-08-11 Carlingswitch, Inc. Snap-on actuator for toggle switch
US4705920A (en) * 1986-04-08 1987-11-10 Lucerne Products, Inc. Electrical switch with rocker actuator having removable locking key

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4359615A (en) * 1981-08-14 1982-11-16 Black & Decker Inc. Switch and means to prevent unauthorized operation thereof
US4524251A (en) * 1983-08-20 1985-06-18 K. A. Schmersal Gmbh & Co. Electrical switch
US4686339A (en) * 1986-02-24 1987-08-11 Carlingswitch, Inc. Snap-on actuator for toggle switch
US4705920A (en) * 1986-04-08 1987-11-10 Lucerne Products, Inc. Electrical switch with rocker actuator having removable locking key

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