GB191306408A - Improvements in or relating to Portable Electric Miners' Lamps. - Google Patents

Improvements in or relating to Portable Electric Miners' Lamps.

Info

Publication number
GB191306408A
GB191306408A GB191306408DA GB191306408A GB 191306408 A GB191306408 A GB 191306408A GB 191306408D A GB191306408D A GB 191306408DA GB 191306408 A GB191306408 A GB 191306408A
Authority
GB
United Kingdom
Prior art keywords
contacts
lamp
switching
resistance
lamps
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
Inventor
Paul Wolf
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of GB191306408A publication Critical patent/GB191306408A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21L—LIGHTING DEVICES OR SYSTEMS THEREOF, BEING PORTABLE OR SPECIALLY ADAPTED FOR TRANSPORTATION
    • F21L2/00—Systems of electric lighting devices

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Abstract

6408. Wolf, P. March 14. Battery lamps; holders, with switches. A miner's lamp is provided with a switching- device which temporarily places a resistance in the lamp circuit at the time of making and breaking the circuit, whereby sparking at the contacts and the consequent ignition of explosive gases are prevented. The switching- device may comprise a rotary plate a provided with a metal socket b for the lamp and with main and auxiliary contacts e, d, e, h. The main contacts are spaced by gaps f, k, from the auxiliary contacts e, h, and are connected thereto through resistances g, i. On rotating the plate a, the auxiliary contacts first come into contact with the terminals of the battery and establish the lamp circuit through the resistances. Upon further rotation, the main contacts engage the battery terminals and the resistance is cut out. The resistance is temporarily inserted upon switching-off in a similar manner.
GB191306408D 1913-03-14 1913-03-14 Improvements in or relating to Portable Electric Miners' Lamps. Expired GB191306408A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB191306408T 1913-03-14

Publications (1)

Publication Number Publication Date
GB191306408A true GB191306408A (en) 1913-12-11

Family

ID=32578469

Family Applications (1)

Application Number Title Priority Date Filing Date
GB191306408D Expired GB191306408A (en) 1913-03-14 1913-03-14 Improvements in or relating to Portable Electric Miners' Lamps.

Country Status (1)

Country Link
GB (1) GB191306408A (en)

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