GB1521474A - Pressure operable electrical switches - Google Patents

Pressure operable electrical switches

Info

Publication number
GB1521474A
GB1521474A GB4806774A GB4806774A GB1521474A GB 1521474 A GB1521474 A GB 1521474A GB 4806774 A GB4806774 A GB 4806774A GB 4806774 A GB4806774 A GB 4806774A GB 1521474 A GB1521474 A GB 1521474A
Authority
GB
United Kingdom
Prior art keywords
film
contacts
contact
switches
closed
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
GB4806774A
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.)
Parmeko Ltd
Original Assignee
Parmeko 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 Parmeko Ltd filed Critical Parmeko Ltd
Priority to GB4806774A priority Critical patent/GB1521474A/en
Publication of GB1521474A publication Critical patent/GB1521474A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • 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
    • H01H3/14—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch adapted for operation by a part of the human body other than the hand, e.g. by foot
    • H01H3/141—Cushion or mat switches

Landscapes

  • Burglar Alarm Systems (AREA)

Abstract

1521474 Mechanical switches PARMEKO Ltd 31 Oct 1975 [6 Nov 1974] 48067/74 Heading H1N A load operated electric switch particularly applicable to theft alarms comprises first and second electric conductors 2, 3, Figs. 1A, 1B, mounted on electrically insulating film 1 to be interconnected or bridged as by a third contact 5 on the same or separate whereby when the film is deformed an electric circuit is closed or opened. The third contact 5 may be printed on the same film whereby the film may be bent over to bring the contact 5 above the contacts 2, 3 and separated by spacers 7. A modification is described in which a number of contact pairs connected in series are arranged on a single film having slots (31) Fig. 5K (not shown), for the insertion of strips carrying bridging contacts 5 arranged above the contacts 4. A parallel switching arrangement is also referred to. The series switches may be arranged to be of the normally open type and held closed by articles placed thereon and the removal of which is to be detected. The parallel switches are of the normally closed type and held open by the insertion of the articles between the contacts whereby removal closes an alarm circuit.
GB4806774A 1975-10-31 1975-10-31 Pressure operable electrical switches Expired GB1521474A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4806774A GB1521474A (en) 1975-10-31 1975-10-31 Pressure operable electrical switches

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4806774A GB1521474A (en) 1975-10-31 1975-10-31 Pressure operable electrical switches

Publications (1)

Publication Number Publication Date
GB1521474A true GB1521474A (en) 1978-08-16

Family

ID=10447242

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4806774A Expired GB1521474A (en) 1975-10-31 1975-10-31 Pressure operable electrical switches

Country Status (1)

Country Link
GB (1) GB1521474A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2158291A (en) * 1984-05-02 1985-11-06 Nottingham County Council Pressure sensitive electrical switch device
EP0178488A2 (en) * 1984-10-13 1986-04-23 Audi Ag Manufacturing process for membrane switches
GB2225660A (en) * 1988-12-05 1990-06-06 Autoliv Dev A trigger circuit arrangement for a vehicle safety device, eg a crash bag
GB2239349A (en) * 1989-12-22 1991-06-26 Triumph Adler Ag Keyboards
DE19604128C1 (en) * 1996-02-06 1997-08-07 Mayser Gmbh & Co Circuit arrangement with two contact surfaces e.g. for switch- mat or switch-plate

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2158291A (en) * 1984-05-02 1985-11-06 Nottingham County Council Pressure sensitive electrical switch device
EP0178488A2 (en) * 1984-10-13 1986-04-23 Audi Ag Manufacturing process for membrane switches
EP0178488A3 (en) * 1984-10-13 1987-11-25 Audi Ag Manufacturing process for membrane switches
GB2225660A (en) * 1988-12-05 1990-06-06 Autoliv Dev A trigger circuit arrangement for a vehicle safety device, eg a crash bag
GB2239349A (en) * 1989-12-22 1991-06-26 Triumph Adler Ag Keyboards
DE19604128C1 (en) * 1996-02-06 1997-08-07 Mayser Gmbh & Co Circuit arrangement with two contact surfaces e.g. for switch- mat or switch-plate

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee