GB731714A - Protective safety device including an electric switch controlled by a guard for electrically driven machinery - Google Patents

Protective safety device including an electric switch controlled by a guard for electrically driven machinery

Info

Publication number
GB731714A
GB731714A GB30883/52A GB3088352A GB731714A GB 731714 A GB731714 A GB 731714A GB 30883/52 A GB30883/52 A GB 30883/52A GB 3088352 A GB3088352 A GB 3088352A GB 731714 A GB731714 A GB 731714A
Authority
GB
United Kingdom
Prior art keywords
guard
contacts
machinery
electric switch
blades
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
GB30883/52A
Inventor
Frederick Walter Henry Maslin
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.)
HUNTLEY AND PALMERS Ltd
Original Assignee
HUNTLEY AND PALMERS 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 HUNTLEY AND PALMERS Ltd filed Critical HUNTLEY AND PALMERS Ltd
Publication of GB731714A publication Critical patent/GB731714A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
    • H01H3/16—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. for a door switch, a limit switch, a floor-levelling switch of a lift
    • H01H3/161—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. for a door switch, a limit switch, a floor-levelling switch of a lift for actuation by moving a closing member, e.g. door, cover or lid
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H36/00—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H36/00—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
    • H01H36/0073—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding actuated by relative movement between two magnets

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)

Abstract

731,714. Machinery safety devices. HUNTLEY & PALMERS, Ltd. Dec. 4, 1953 [Dec. 5, 1952], No. 30883/52. Class 80 (4). [Also in Group XXXVII] An electric switch 1 controlling machinery protected by a wire guard 2 ensures that the motor driving the machinery is disconnected from the supply except when the guard is in position, and comprises a pair of contactcarrying blades 14, 15 mounted on an insulating block 7 within a non-magnetic casing 3, the contacts 25, 26 co-operating with fixed contacts 12, 13 on a conducting arm 9 also mounted on the block. The free ends of the blades 14, 15 are connected by an insulating sleeve 20 and the blades are biased so that the contacts 12, 25 engage and contacts 13, 26 disengage. A bolt 23, in the sleeve 20 carries a permanent magnet 24 and the guard 2 carries a permanent magnet 32 so that when the guard is placed in position the magnet 24 is attracted and contacts 12, 25 are opened and contacts 13, 26 closed. In a modification, the magnets are arranged with their like poles opposite so that the magnet 24 is repelled. Further, either of the magnets may be replaced by an armature and part of the guard may constitute an armature.
GB30883/52A 1952-12-05 1952-12-05 Protective safety device including an electric switch controlled by a guard for electrically driven machinery Expired GB731714A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB317664X 1952-12-05

Publications (1)

Publication Number Publication Date
GB731714A true GB731714A (en) 1955-06-15

Family

ID=10328081

Family Applications (1)

Application Number Title Priority Date Filing Date
GB30883/52A Expired GB731714A (en) 1952-12-05 1952-12-05 Protective safety device including an electric switch controlled by a guard for electrically driven machinery

Country Status (2)

Country Link
CH (1) CH317664A (en)
GB (1) GB731714A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8235235B1 (en) 2008-10-24 2012-08-07 Honda Motor Co., Ltd. Limit switch cover with magnetic breakaway

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8235235B1 (en) 2008-10-24 2012-08-07 Honda Motor Co., Ltd. Limit switch cover with magnetic breakaway

Also Published As

Publication number Publication date
CH317664A (en) 1956-11-30

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