US3397373A - Fire warning cable - Google Patents

Fire warning cable Download PDF

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Publication number
US3397373A
US3397373A US605396A US60539666A US3397373A US 3397373 A US3397373 A US 3397373A US 605396 A US605396 A US 605396A US 60539666 A US60539666 A US 60539666A US 3397373 A US3397373 A US 3397373A
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US
United States
Prior art keywords
slug
cable
conductors
gaps
melting point
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 - Lifetime
Application number
US605396A
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English (en)
Inventor
Spicer Lyndon Reginald
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 International Standard Electric Corp filed Critical International Standard Electric Corp
Application granted granted Critical
Publication of US3397373A publication Critical patent/US3397373A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/06—Electric actuation of the alarm, e.g. using a thermally-operated switch
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • 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
    • 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
    • H01H2037/768—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material characterised by the composition of the fusible material

Definitions

  • ABSTRACT OF THE DISCLOSURE A cable for a re warning system in which a pair of conductors are covered by insulation having gaps to expose the conductors. Low melting point slugs of conductive material overlie the gaps and are encased in an elastic sleeve which when the slugs are melted force -them in-to the gaps to form a conductive path between the conductors.
  • This invention relates to cables for use in re warnin-g systems, and to methods of manufacturing such cables.
  • a cable for use in a tire warning system comprising two insulated conductors, an a plurality of slugs of material having a low melting point, said slugs being spaced apart along the length of the cable, wherein each slug is so arranged that on reaching its melting point it provides an electrically conductive path between said two conductors.
  • a cable for use in a re warning system comprising two insulated conductors, a plurality of slugs of material having a low melting point, said slugs being spaced apart along the length of the cable, and .means individually :associated with each one of the slugs for causing the associated slug on reaching its melting point to provide an electrically conductive path between said two conductors.
  • FIGS. 1 and 2 are a side view and -a cross section respectively illustrating a lirst embodiment
  • FIG. 3 is a cross section of a second embodiment
  • FIGS. 4a and 4b are a side view and an exploded view respectively of a third embodiment
  • FIG. 5 illustrates steps in the manufacture of the ythird embodiment.
  • FIGS. 1 and 2 employs a cable consisting of two parallel copperclad steel conductors 1 and 2 and a polyvinyl chloride insulating cover 3 havingtwo at surfaces.
  • the polyvinyl chloride cover has a height of 0.017 inch between the at surfaces, and the maximum perpendicular diameter is 0.15 inch.
  • the conductors are exposed by gaps 4 in the polyvinyl chloride cover which occur, for example, at intervals of .three feet along the length of the cable. A Suitable width for each gap is 3/16 inch.
  • Slugs 5 of an alloy having a low melting point bridge the gaps in the polyvinyl chloride cover, and each slug is held in place by an elastic, e.g.
  • Suitable examples of alloys having a low melting point are Cerrobend RTM which has a melting point in a range from 70 C. and above, and Woods metal.
  • the composition of the latter alloy can be varied to obtain melting points in the range 117 F. to 302 F., in one form it l' 3,397,373 Ice Patented Aug. 13, 1968 consists of 50% bismuth, 13% cadmium, 25% lead and 12% tin.
  • the slug has a length of 0.3 inch, a width of 0.15 inch and a thickness of 0.05 inch.
  • the cable together with the slugs can be sheathed with out melting the alloy.
  • the elastic sleeve may be replaced by some other retaining device and the effect of gravity on the melted slug be used to provide an electrically conductive path between the two conductors.
  • FIGS. 4a and 4b are a side view and an exploded view respectively of a fourth view of the invention.
  • a cable 13 similar to that of FIGS. 1 and 2 is provided with gaps 14 at intervals along its length which have similar dimensions to the gaps 4 of FIG. l.
  • Metallic, e.g. aluminium plates 15 crimped around the lgaps 14 are each provided with a punched recess 16 Iopposite the gap 14.
  • the recesses 16 are loaded with resilient, e.g. rubber pads 17 and low melting point alloy slugs 18, the rubber pads being compressed against the slugs, and the latter bridging the gaps 14.
  • FIG. 5 illustrates successive stages in the manufacture of FIG. 4.
  • stage (i) of the manufacture a recess 19 is punched in an initially continuous aluminium strip 20 which is moving in lthe direction of the arrow.
  • stage (ii) a rubber pad 21 is blanked from a strip of rubber and drives into the recess 19.
  • stage (ii) a rubber pad 21 is blanked from a strip of rubber and drives into the recess 19.
  • another recess 22 is punched on the strip at the first point of the production line.
  • stage iii) a low melting point alloy slug 23 is blanked from a strip and driven into the recess 19 over the rubber pad 21.
  • Stages l and 2 are repeated for each recess.
  • stage (v) The assembled unit is separated from the 4strip of -aluminium stage (iv) and the aluminium surrounding the unit is preformed into a U-shaped member 24.
  • stage (v) a slot 14 in a cable 13 is located over the alloy slug 23 and the preformed aluminium is crimped round the cable to form a sleeve 25 so that the rubber pad is compressed against the alloy slug.
  • Previous stages are repeated in each of stages (iv) and (v).
  • a cable for use in a fire warning system comprising:
  • a cable according to claim 1 wherein said cable is a coaxial cable having its inner conductor exposed to the surrounding outer conductor through the gap in the insulation surrounding said inner conductor and through a gap in the outer conductor, and each of said slugs bridges one of said gaps in the outer conductor.
  • a cable according to claim 2 further including an elastic sleeve stretched over the portion of the cable which includes one of said slugs bridging one of said gaps in the -outer conductor, -and an insulating cover sur-rounding said sleeve and outer conductor.
  • a cable according to claim 1 wherein said two conductors are parallel insulated conductors which are periodically exposed by said gaps, each of said gaps is bridged by said slug and a resilient pad compressed against said slug, and means are provided at each of said gaps for locating and maintaining said slug and resilient pad in the proper position.
  • a cable according to claim 4 wherein said locating and maintaining means is a metallic plate crimped around said cable and provided with Ia recess for said resilient pad and slug.
  • a cable according to claim 5 wherein the material of said slug is an electrically conductive metal alloy.
  • a coaxial cable for use in a re warning system comprising:
  • an insulated inner conductor having a plurality of gaps spaced along the length of the insulation to ⁇ expose the inner conductors
  • van insulating cover completely surrounding said outer conductor and sleeve.
  • a cable for use in a fire warning system comprising:
  • a slug of material having a 10W melting point bridges each of said gap

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  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Fire-Detection Mechanisms (AREA)
US605396A 1965-12-31 1966-12-28 Fire warning cable Expired - Lifetime US3397373A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB55347/65A GB1140726A (en) 1965-12-31 1965-12-31 Cables for use in fire warning systems

Publications (1)

Publication Number Publication Date
US3397373A true US3397373A (en) 1968-08-13

Family

ID=10473655

Family Applications (1)

Application Number Title Priority Date Filing Date
US605396A Expired - Lifetime US3397373A (en) 1965-12-31 1966-12-28 Fire warning cable

Country Status (4)

Country Link
US (1) US3397373A (cs)
DE (1) DE1640501A1 (cs)
GB (1) GB1140726A (cs)
NL (1) NL6618396A (cs)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113782257A (zh) * 2021-09-08 2021-12-10 中国科学院理化技术研究所 防火灾电缆

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19935439A1 (de) * 1999-07-28 2001-02-15 Siemens Ag Sensorleitung
JP2012230830A (ja) * 2011-04-26 2012-11-22 Fujitsu Ltd 同軸ケーブル

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1109878A (en) * 1911-12-30 1914-09-08 Jerome Sulzbacher Alarm-cable.
US1829149A (en) * 1927-08-20 1931-10-27 American Electrical Company Thermostat
US3294941A (en) * 1965-10-21 1966-12-27 Robert D Mullen Heat-responsive electric cable formed of heat shrinkable material
US3305625A (en) * 1966-02-10 1967-02-21 Raychem Corp Heat shrinkable solder sleeve
US3316343A (en) * 1966-01-03 1967-04-25 Raychem Corp Heat shrinkable connector with preplaced solder therein

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1109878A (en) * 1911-12-30 1914-09-08 Jerome Sulzbacher Alarm-cable.
US1829149A (en) * 1927-08-20 1931-10-27 American Electrical Company Thermostat
US3294941A (en) * 1965-10-21 1966-12-27 Robert D Mullen Heat-responsive electric cable formed of heat shrinkable material
US3316343A (en) * 1966-01-03 1967-04-25 Raychem Corp Heat shrinkable connector with preplaced solder therein
US3305625A (en) * 1966-02-10 1967-02-21 Raychem Corp Heat shrinkable solder sleeve

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113782257A (zh) * 2021-09-08 2021-12-10 中国科学院理化技术研究所 防火灾电缆
CN113782257B (zh) * 2021-09-08 2024-04-05 中国科学院理化技术研究所 防火灾电缆

Also Published As

Publication number Publication date
DE1640501A1 (de) 1970-07-30
GB1140726A (en) 1969-01-22
NL6618396A (cs) 1967-07-03

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