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Publication numberUS1703749 A
Publication typeGrant
Publication dateFeb 26, 1929
Filing dateApr 25, 1925
Priority dateApr 25, 1925
Publication numberUS 1703749 A, US 1703749A, US-A-1703749, US1703749 A, US1703749A
InventorsFrederick W Rahm
Original AssigneeNat Carbon Co Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Flash light
US 1703749 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

" of the lamp socket.

Patented Feb. 26, 1929.




Application filed April 25, 1925. Serial No. 25,727.

This invention relates to flashlights and which is sufficiently large to permit passage of more particularly to a new and useful focusing arrangement for flashlights.

The presentinvention is an improvementon the focusing device disclosed and claimed in the copending application of WVilliam F. Hendry, Serial No. 22,962, filed April 9, 1925, and its purpose is to provide a device by meansof which the electric light bulb isat all times substantially centered within a relatively large opening of the reflector through which the bulb is adapted to pass. 7

. In accordance with this invention the focusing is controlled by a spring which forms part The socket is stamped out of a piece of metal with a cup-shaped flange from which a plurality of fingers pro ject into engagement with the lower surface of the reflector. By means of these fingers the reflector will be properly centered with respect to the light bulb and these fingers will serve for the purpose of controlling relative movements of the bulb and the reflector and also to absorb shocks that may result in the destruction of the lamp filament.

The invention will be more fully understood from the following detailed description of a preferred embodiment thereof and the appended claims.

In the drawings, Fig. 1 is a sectional View illustrating theessential parts of a flashlight; and Fig. 2 is a top view of the lamp socket in an intermediate stage of its manufacture.

The flashlight consists of a tubular metallic casing 1 enclosing a dry cell battery 2. The zinc electrode of the battery is in contact with a flange 3 projecting from a cap 4 which is in screw-threaded engagement with the lower end of the tubular casing 1. The carbon electrode 5 of the battery'contacts with one tenninal 6 of an incandescent electric light bulb 7. The other terminal of the lamp 7 is connected with a metallic screw-threaded base 8. The base 8 is in screw-threaded engagement with a metallic socket 9 provided with a cup-shaped flange 10. As illustrated in Fig. 2, the cupshaped flange 10 is stamped out of a resilient piece of metal with four spring fingers 11, 12, '13, 14. These fingers are bent up at right anles. t ened to a disc or diaphragm 15 of insulating material which is seated on an annular shoulder 16 provided in the casing 11. On top of the lamp and socket assembly is placed a metallic reflector 17 provided with an opening 18 The socket 9 and its flange 10 are fas-.

the light bulb 7. The reflectorv is seated on the four spring fingers 11, 12, 13, 14 and is firmly held in place by means of alens 19 clamped to the end of the casing lby means of a ring 20. The reflector 17 is insulated from the casing by means of a sleeve 21 seated on a shoulder 22 provided in the bell-shaped end 23 of easing 1. By rotating the cap 4 the battery 2 may be reciprocated within the easmgand will force the bulb 7 with its socket against the tension of spring fingers 11,12, 13, 1 1, effecting thus any desired focusing. The

spring fingers slide along the lower surface of the reflector 17 and when the cap 4 is unextends through terminal 6, the battery 2, the

casing 1, contact spring 24, reflector 17 with which the spring is in engagement, the spring fingers 11 to l t, the flange 10, socket 9, base 8, back to the other terminal of the lamp. The circult is controlled by means of a button 26 which cooperates with the spring 24, the latter being fastened to the easing'l by means of rivets 27, but is insulated therefrom by a suitable wrapper28.

IVhat I claim is:

1. In a flashlight, a reflector and a lamp movable with respect to each other, means whereby the reflector and lamp are relatively adjusted to focus the light, a socket for the lamp, and a plurality of resilient projections on said socket engaging said reflector, tendingto force said reflector and lamp away from each other. I

.2. In a flashlight, a reflector and a lamp movable with respect to each other to focus the light, a socket for said lamp supported below said reflector and movable with said lamp, I

and a plurality of spring fingers projecting from said socket into engagement with said reflector to oppose in one direction the focusing movement.

3. In a flashlight, a casing, a battery and a metallic reflector in said casing, an incandescent light bulb adapted to pass through an opening in said reflector, an insulating disc supported inzsaid casing, a socket tor the base of said bulb carried by said=disc',l0ne terminal of the light bulb projecting through said disc into engagement with one electrode of said battery, a cup-shaped flangei'or'said socket, a plurality ozt sprin-g fingers projecting from said flange into engagement with the lower surface of said reflector, and screw-threaded means for moving said battery within said casing against the tension of said spring fingers.

having a sock'et,.a reflector, means for moving said bulb with respect-to said reflector ioi and said reflector anopen ended lamp socket between the diaphragm and the reflector, andreslhent members carrled by said socket and 4. In afiash1ight,.an eleetrie light bulb adapted to engagethe reflectorto align the reflector with the socketand normally to bias the socket away from the reflector.

6. In a flashlight, a casing, a reflector mounted near-one-end "of said casing, alamp socket in said casing inwardly of said reflector, resilient means extending outwardly from said socket and engaging said reflector for centering said reflector and tending to move said socket away froinsaidreflector.

7. In a flashlight, a casing, alens'and-an insulating sleeve engaging said Teasing, a reflector between said lens and sleeve said cas ing being provided with a shoulder, a shiftable diaphragm engaging said shoulder, a socket secured to said diaphra m, resilient means 011 said socket engaging said reflector and normally biasing said socket away from said reflector and a switch element on said case, said diaphragm being provided with ,a

notch forengaging the switch element where by rotation of said diaphragm is prevented.

In testimony whereof I have signed my name to this specificationthis 10th day of April,1925.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4987523 *Feb 28, 1990Jan 22, 1991Bruce Wayne LindaburyAdjustable beam focus flashlight
US5126927 *Jul 22, 1991Jun 30, 1992The Brinkmann CorporationFlashlight having improved bulb enclosure
US6364504Dec 3, 1999Apr 2, 2002The Brinkmann CorporationHand-held spot light having a battery by-pass circuit
U.S. Classification362/188
International ClassificationF21V19/02, F21L4/00
Cooperative ClassificationF21V19/02, F21L7/00, F21L4/00
European ClassificationF21L7/00, F21L4/00, F21V19/02