GB916030A - Improvements in or relating to impact-operable electric alarm switch devices - Google Patents

Improvements in or relating to impact-operable electric alarm switch devices

Info

Publication number
GB916030A
GB916030A GB22627/58A GB2262758A GB916030A GB 916030 A GB916030 A GB 916030A GB 22627/58 A GB22627/58 A GB 22627/58A GB 2262758 A GB2262758 A GB 2262758A GB 916030 A GB916030 A GB 916030A
Authority
GB
United Kingdom
Prior art keywords
envelope
switch
rods
spring
frangible
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
GB22627/58A
Inventor
Harvey Sydney Hall
Michael John Everitt
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.)
Heraeus Noblelight Analytics Ltd
Original Assignee
Cathodeon 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 Cathodeon Ltd filed Critical Cathodeon Ltd
Priority to GB22627/58A priority Critical patent/GB916030A/en
Priority to US826747A priority patent/US3038042A/en
Publication of GB916030A publication Critical patent/GB916030A/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
    • H01H35/14—Switches operated by change of acceleration, e.g. by shock or vibration, inertia switch
    • H01H35/146—Switches operated by change of acceleration, e.g. by shock or vibration, inertia switch operated by plastic deformation or rupture of structurally associated elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/14—Switches operated by change of acceleration, e.g. by shock or vibration, inertia switch

Landscapes

  • Push-Button Switches (AREA)
  • Manufacture Of Switches (AREA)

Abstract

916,030. Impact-operable switches; magnetic switches. CATHODEON Ltd. July 15, 1959 [July 15, 1958], No. 22627/58. Class 38 (5). A switch which operates upon breakage of a frangible casing, by collision or crashing of aircraft or other vehicles, for example, comprises a glass envelope 1, a base seal 3 and a flange 2 with an insulating block 16 moulded therearound to carry terminals 15 connected to four or more rods 9. The ends of rods 9 are located in an insulating block 5 supported by a central pillar 4, contact eyelets 12 being provided as shown. An insulating block 18 slidable on pillar 4 and rods 9 carries bridging contact plates 28 and is urged by a spring 21 towards the contacts 12 but is held off by a stronger spring 23 as long as envelope 1 is unbroken. In an alternative embodiment (Figs. 2 and 4) the frangible envelope 29 restrains an insulating piston 36 against a spring 38 such that ribs 37 prevent spring blades 34 from bridging rods 31. Each rod 31 has an L-shaped spring blade 34 mounted on it (Fig. 4) such that not only is contact made if the piston 36 is released or forced towards the base seal 32 but also if the switch is subjected to a sideways wrenching force. The frangible envelope may be evacuated or contain a gas such as nitrogen, hydrogen or argon. In a modification (Fig. 5, not shown), the switch is rendered flame-proof by replacing the moulded insulating base block by a mild steel housing filled with a silicone elastomer, the frangible envelope and a standard end connector being attached by a threaded ring and bolts, respectively. Magnetic operation.-The switch of Fig. 2 is provided with a soft iron slug 40 in the head of the piston 36 which renders it possible to actuate the switch for test purposes, without breaking the envelope, by means of a suitable solenoid or permanent magnet. Specifications 574,947 and 716,504 are referred to.
GB22627/58A 1958-07-15 1958-07-15 Improvements in or relating to impact-operable electric alarm switch devices Expired GB916030A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB22627/58A GB916030A (en) 1958-07-15 1958-07-15 Improvements in or relating to impact-operable electric alarm switch devices
US826747A US3038042A (en) 1958-07-15 1959-07-13 Impact-operable electric alarm switch devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB22627/58A GB916030A (en) 1958-07-15 1958-07-15 Improvements in or relating to impact-operable electric alarm switch devices

Publications (1)

Publication Number Publication Date
GB916030A true GB916030A (en) 1963-01-16

Family

ID=10182498

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22627/58A Expired GB916030A (en) 1958-07-15 1958-07-15 Improvements in or relating to impact-operable electric alarm switch devices

Country Status (2)

Country Link
US (1) US3038042A (en)
GB (1) GB916030A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3793501A (en) * 1972-12-04 1974-02-19 Ici America Inc Explosive switch
GB2140625A (en) * 1983-05-27 1984-11-28 Minnesota Mining & Mfg Electrical switch

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4012613A (en) * 1960-12-23 1977-03-15 The United States Of America As Represented By The Secretary Of The Navy Inertial switch
US3380540A (en) * 1966-05-09 1968-04-30 Schlumberger Technology Corp Selective firing apparatus
US5438173A (en) * 1994-01-27 1995-08-01 G & H Technology, Inc. Cell bypass switch
DE10062528C1 (en) * 2000-12-13 2002-07-11 Jenoptik Jena Gmbh Arrangement for the detection of impermissibly high forces on the load-bearing structure of a vehicle

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1223866A (en) * 1916-02-15 1917-04-24 Clarence J Graham Circuit-closer for automatic train-stops.
US2352692A (en) * 1941-02-26 1944-07-04 Joseph A Dann Automatically operable safety landing switch for airplanes
US2783320A (en) * 1956-09-19 1957-02-26 Armand F Fink Pressure switch

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3793501A (en) * 1972-12-04 1974-02-19 Ici America Inc Explosive switch
GB2140625A (en) * 1983-05-27 1984-11-28 Minnesota Mining & Mfg Electrical switch
US4554424A (en) * 1983-05-27 1985-11-19 Minnesota Mining And Manufacturing Co. Electrical switch

Also Published As

Publication number Publication date
US3038042A (en) 1962-06-05

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