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Electric conductor.

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Publication number
US1108350A
US1108350A US1913804275A US1108350A US 1108350 A US1108350 A US 1108350A US 1913804275 A US1913804275 A US 1913804275A US 1108350 A US1108350 A US 1108350A
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Prior art keywords
gas
electric
conductor
metal
lamp
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Expired - Lifetime
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Fritz Faerber
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Fritz Faerber
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V21/00Supporting, suspending, or attaching arrangements for lighting devices; Hand grips
    • F21V21/08Devices for easy attachment to any desired place, e.g. clip, clamp, magnet
    • F21V21/0824Ground spikes
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21LLIGHTING DEVICES OR SYSTEMS THEREOF, BEING PORTABLE OR SPECIALLY ADAPTED FOR TRANSPORTATION
    • F21L4/00Electric lighting devices with self-contained electric batteries or cells
    • F21L4/06Electric lighting devices with self-contained electric batteries or cells with the light source coupled to the remainder of the device solely by cable
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V25/00Safety devices structurally associated with lighting devices
    • F21V25/12Flameproof or explosion-proof arrangements

Description

P. FARBER.

ELEGTRIG CONDUCTOR.

AFPLIOATION FILED DBO. 2, 1913.

1,1 08,350, Patented Aug. 25, 1914 HE NORRIS PETERS 60.. PHOTO-LIIHOY, WASHINGTON. D C.

rnrrz rltnsnra, or DOR'IMUND, GERMANY.

ELECTRIC CONDUCTOR.

Specification of Letters Patent.

Application filed December 2, 1913.

Patented Aug. 25, 1914. Serial No. 804,275.

, ject of the King of Prussia, German Emperor, and resident of Dortmund, in the Kingdom of Prussia, German Empire, have invented an Improved and Novel Electric Conductor, of which the following is a specification.

The electric safety lamps hitherto employed in mines or other dangerous industrial works are generally constructed in such a way that the accumulator and the incandescence lamp are united in a solid casing. There is, however, a need in some industrial works to have the lamp proper and the ac- 3 cumulator separated one from the other,

both parts being then electrically connected by a flexible cord, but this arrangement has the drawback that in the case of an injury to that cord short-circuiting may occur which then may give rise to an explosion if an explosive gas or gas mixture is present. Such a danger isobviated by my present invention, one form of execution of which is illustrated as an example in the accompanying drawing, in which a is an electric accumulator, 0 the incandescence lamp proper, and Z) a flexible cord connecting the parts a and 0 with each other.

lhe gist of the invention now resides in using as conducting metal in the cord a metal the fusing point of which is very low, such, for instance, as load or tin. It by any cause a short-circuit is produced in the cord, for instance by one or the cord wires tearing or breaking, and piercing the insulating covering and coming in contact with the other wire so as to produce a short-circuit, then this latter will fuse the wire metal, but no explosion will occur, because the fusing temperature amounts to about 400 C. only, whereas the ignition temperature of the explosive gas or gas mixture is considerably higher, 2'. 6. about 700 C, In the case of copper, however, an explosion would take place, as the fusing temperature of copper lies considerably above 700 C. and thus white-heat already would ignite the explosive gas or gas mixture.

Electric circuits in which one ofthe con ductors is made of an easily fusible metal have already become known, it is true, but they in general and the easily fusible conductor in particular termed a part of a fire alarm plant operated with constant current, andthe object was to interrupt this current and actuate thus the alarm mechanism ii. that conductor got fused in the case of a fire. Thus, although the means 7961" as is already known, still, it is employed in the present case in a novel combination and for a novel purpose, viz. in combination with safety lamps and for the purpose of interrupting the current in the case oi a short-circuit by letting the conductor metal be fused at a r temperature which doesnot rise to the ignition temperature oi. the gas or gas mixture surrounding the lamp.

The sparks arising on opening a circuit operating with a current of from 2 to 4 volts, as generally used in connection with lamps of the kind in question, do not ignite a gas or gas mixture elf the kind in question, and therefore it the connecting cbrd should get torn this will. not bring about an ignition of the explosive Connecting cords orconductors 01 this kind, as before described, may thus be regarded eXplosion-proof.

Having now described my invention, what I desire to secure by a Patent of the United Fitates isf l The combination, with a battery and an electric safety lamp, of connecting conductors consisting elf a metal the fusing point of which lies below the ignition tern as that may be perature of an explosive said lamp, tor

present inthe space around the purpose as described. a p

In testimony whereoi I aflii: my signature in presence of two witnesses.

FRITZ FilRBER.

[n s] Witnesses:

ALBERT Nurse, FRANCES NUFER.

Copies of this patent may be obtained for live cents each, by addressing the Commissioner of Patents,

Washington, D. 0." a

US1108350A 1913-12-02 1913-12-02 Electric conductor. Expired - Lifetime US1108350A (en)

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US1108350A US1108350A (en) 1913-12-02 1913-12-02 Electric conductor.

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5154483A (en) * 1991-08-09 1992-10-13 Zeller Noel E Flashlight with flexible extension
US5517392A (en) * 1994-08-05 1996-05-14 Black & Decker Inc. Sleeve retention for flexible core of a flashlight
US5521803A (en) * 1994-08-05 1996-05-28 Eckert; Lee H. Flashlight with flexible core
US20040174703A1 (en) * 2003-03-04 2004-09-09 Lisle Corporation Flexible flashlight with LED light source

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5154483A (en) * 1991-08-09 1992-10-13 Zeller Noel E Flashlight with flexible extension
US5517392A (en) * 1994-08-05 1996-05-14 Black & Decker Inc. Sleeve retention for flexible core of a flashlight
US5521803A (en) * 1994-08-05 1996-05-28 Eckert; Lee H. Flashlight with flexible core
US20040174703A1 (en) * 2003-03-04 2004-09-09 Lisle Corporation Flexible flashlight with LED light source

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