GB1422557A - Theramal time delay devices and sequential activation of electrical apparatus using them - Google Patents

Theramal time delay devices and sequential activation of electrical apparatus using them

Info

Publication number
GB1422557A
GB1422557A GB251773A GB251773A GB1422557A GB 1422557 A GB1422557 A GB 1422557A GB 251773 A GB251773 A GB 251773A GB 251773 A GB251773 A GB 251773A GB 1422557 A GB1422557 A GB 1422557A
Authority
GB
United Kingdom
Prior art keywords
resistor
metal
cylinder
lead
time delay
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
GB251773A
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.)
EXEC Pty
African Explosives and Chemical Industries Ltd
Original Assignee
EXEC Pty
African Explosives and Chemical Industries 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 EXEC Pty, African Explosives and Chemical Industries Ltd filed Critical EXEC Pty
Publication of GB1422557A publication Critical patent/GB1422557A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H61/00—Electrothermal relays
    • H01H61/02—Electrothermal relays wherein the thermally-sensitive member is heated indirectly, e.g. resistively, inductively
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
    • F42D1/04—Arrangements for ignition
    • F42D1/045—Arrangements for electric ignition
    • F42D1/05—Electric circuits for blasting
    • F42D1/055—Electric circuits for blasting specially adapted for firing multiple charges with a time delay
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
    • F42D1/04—Arrangements for ignition
    • F42D1/06—Relative timing of multiple charges
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
    • H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
    • H01H37/767—Normally open

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuses (AREA)
  • Air Bags (AREA)

Abstract

1422557 Thermal switches EXEC (PTY) Ltd and AE & CI Ltd 17 Jan 1973 [19 Jan 1972] 2517/73 Heading H1N [Also in Division H2] A time delay device includes conductors 14, 16, and 26 fusible metal 24 and means 10 in series with conductor 14, 16 for heating metal 24 so that after a predetermined time it melts and electrically connects conductors 14, 16, and 26. Means 10 is a resistor escapsulated in an insulating compound 12, e.g. an epoxy resin, in cylinder 14 which is supported by insulators 22 in cylinder 26 encapsulated in thermal and electrical insulating material. Cylinders 14, 26 are of metal, e.g. brass, aluminium and copper. Metal 24 may be Wood's metal, with flux 27 on its free surface to improve its flow properties when molten. Resistor 10 has leads 16, 20, lead 16 being also connected to closed end 18 of cylinder 14 so that circuit is made between lead 16 and lead 28 connected to cylinder 26. In a second embodiment, Fig. 2 (not shown), contact is made between an outer cylinder 30 and a central core comprising a resistor lead 33 when resistor 31 melts annular fusible metal 34 spaced from resistor 31 axially by spacing washer 40. The device is used for sequentially firing detonator fuse heads 50, 52, 54, Fig. 3 (not shown) (see Division H2).
GB251773A 1972-01-19 1973-01-17 Theramal time delay devices and sequential activation of electrical apparatus using them Expired GB1422557A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ZA720375A ZA72375B (en) 1972-01-19 1972-01-19 Sequential activation of electrical apparatus

Publications (1)

Publication Number Publication Date
GB1422557A true GB1422557A (en) 1976-01-28

Family

ID=25564393

Family Applications (1)

Application Number Title Priority Date Filing Date
GB251773A Expired GB1422557A (en) 1972-01-19 1973-01-17 Theramal time delay devices and sequential activation of electrical apparatus using them

Country Status (5)

Country Link
US (1) US3836884A (en)
AU (1) AU5125373A (en)
CA (1) CA982635A (en)
GB (1) GB1422557A (en)
ZA (1) ZA72375B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5204799A (en) * 1990-03-22 1993-04-20 Gpt Limited Protective arrangement for telecommunications line interface circuit
CN202632917U (en) * 2010-12-31 2012-12-26 厦门赛尔特电子有限公司 Device combining temperature fuse and resistor

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1829149A (en) * 1927-08-20 1931-10-27 American Electrical Company Thermostat
US2085379A (en) * 1935-08-08 1937-06-29 Clarence L Metzgar Fire alarm apparatus
US2501457A (en) * 1945-07-20 1950-03-21 Fenwal Inc Fire detector cable
US2779014A (en) * 1950-03-21 1957-01-22 Whitman D Mounce Stepping switch
US2832265A (en) * 1956-01-03 1958-04-29 Century Engineers Inc Squib firing intervalometer
US3386063A (en) * 1960-10-03 1968-05-28 Gen Electric Temperature responsive fuses and apparatus embodying such fuses

Also Published As

Publication number Publication date
US3836884A (en) 1974-09-17
CA982635A (en) 1976-01-27
AU5125373A (en) 1974-07-25
ZA72375B (en) 1973-06-27

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees