ELECTRIC LAMPS FOR EMERGENCY AND/OR FOR DUTY UNDER PARTICULAR ENVIRONMENT CONDITIONS, AND RELATIVE IMPROVED LAMPS

• US 3,641,336 A
• Filed: 04/05/1971
• Issued: 02/08/1972
• Est. Priority Date: 05/06/1967
• Status: Expired due to Term

• Current Assignee: Giovanni Boin
• Original Assignee: Giovanni Boin
• Inventors: Boin, Giovanni
• Primary Examiner(s): Matthews, Samuel S.
• Assistant Examiner(s): Wintercorn, Richard A.
• Application Number:
  US05/130,826
• Time in Patent Office: 309 Days
• Field of Search: 240/1.6R 320/2-4
• US Class Current: 362/183
• CPC Class Codes: F21L 4/08 characterised by means for in situ recharging of the batteries or cells
• CPC Class Codes: F21V 25/12 Flameproof or explosion-proof arrangements
• CPC Class Codes: F21V 31/00 Gas-tight or water-tight arrangements
• CPC Class Codes: F21V 33/0064 Health, life-saving or fire-fighting equipment
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 7/0042 characterised by the mechanical construction
• CPC Class Codes: H02J 9/02 in which an auxiliary distribution system and its associated lamps are brought into service
• CPC Class Codes: Y10S 336/02 Separable

Abstract

An electric emergency lamp includes a self-contained power supply, comprising a rechargeable accumulator or battery, a first electric circuit connectable to an external power supply for battery recharge and a second electric circuit controllable from the outside to switch on the light source of the lamp. The lamp is designed to operate in environments and/or conditions requiring the observance of tight seals, the lack of connections capable of giving rise to sparking and the like, for which purpose the electric battery circuits are incorporated within a waterproof lamp casing and can be connected to an external AC supply by an electric magnetoinductively operating power transducer, the secondary winding of which is incorporated within the waterproof casing, whereas the primary winding can be brought close to the waterproof casing, so as to ensure the closure of the magnetic circuit between said primary and secondary windings.

Claims

1. A portable electric emergency lamp comprising a casing, a light source, a self-contained power supply constituted by a rechargeable battery in the casing, a transformer, a first winding of the transformer being associated with the lamp casing and connected to the battery, the second winding being detachable from the casing, a first electric circuit connected to the battery and connectable to the first winding for battery recharge and a second electric circuit controllable from the outside to connect the light source to the battery, the second winding being connectable to an external AC supply, said transformer comprising an electric magnetoinductively operating power transducer, said transformer windings being each associated with an armature section, the two armature sections jointly forming the magnetic circuit when the surfaces of said supply head and casing are caused to touch.

2. A lamp as in claim 1, including normally open switching means in circuit with one of said windings and magnetically biasable, and permanent magnet means carried by the part carrying the other winding to bias said switching means to closed position.

3. Improved lamp as in claim 2, comprising a movable handle formed as a waterproof casing carrying said second winding, said permanent magnet means being incorporated in said lamp casing.

4. The improved lamp as in claim 1, wherein a capacitor is connected in series to the electric circuit of the primary winding, said capacitor forming in conjunction with the impedance of said electric circuit an LC circuit for limiting the current absorption of the primary winding when moved away from the secondary winding.