US1680836A - Lamp-focusing device - Google Patents

Description

E. C. ALBRIGHT LAMP FOCUSING DEVICE Aug. 14, 1928.

Filed June '11 INVENTOR Epwmw (7 Hz ak/cflr.

ATTOR Patented Aug. 14, 1928.

UNITED STATES,

PATENT OFFICE.

EDWARD C. ALBRIGHT, OF CONNEBSVILLE, INDIANA, ASSIGNOB TO INDIANA LAMP CORPORATION, OF CONNERSVILLE, INDIANA, A CORPORATION.

Lamr-roousme DEVICE.

Application filed June 11, 1927. Serial No. 198,228.

This invention relates to a focusing-d6 yicc for lamp bulbs.

sists in the tiltable support of a lightbulb "receiving socket upon a slidable support and an adjustable mechanism for maintain ing the bulb in the adjusted position, said mechanism having a portion exteriorly exposed for adjustment.

The full nature of the invention will be understood from the accompanying drawings and the following description and claims.

In the drawings Fig. 1 is a central sectional view thru a head-lamp, parts thereof being omitted and parts of theinvention being shown in elevation. Fig. 2 is a. top plan view of the lamp-bulb and adjustable support. Fig.3 is a central sectional view of parts in elevation of a modified form of tiltable and slidable support for a light bulb. Fig. 4 is a view similar to Fig. 3 and of a still further modified form of the invention.

In the drawings 10 indicates a conventional form of easing having a recess 11, the base 12 of which is centrally apertured to slidably receive a tubular bolt 13 having the tool receiving head 14 exteriorly positioned in the recess and a threaded bolt por tion 15 within the casing. The interior of the tubular bolt is threaded to receive a threaded focusing member 16 having a toolengageable portion or head 17 positioned without the casing and a cam-engaging por tion 18 within the casing, both extending oppositely beyond the tubular bolt.

The reflector 19 is provided with a central aperture 20 and movably mounted therein is a socket 21 adapted to receive a lamp bulb 22, the same having a conventional energy supply 23. A U-shaped bracket having the mid-portion 24 and the parallel arms 25 pivotally supports as at 26 the socket 21. The mid-portion 24 is provided with the threaded opening 27 which threadedly receives the threaded bolt 13. Interposed between the casing and the mid-portion 24 of the socket support is a coil spring 28 which normally tendsto maintain the head 14 seated in the recess 11 and thus maintains the bulb-receiving socket in the projected position. Thus the light bulb can be moved axially by rotating the'tubular bolt.

Thesocket 21 supports at 30 a cam strip 31 which extends between the two :arms 25 and terminates in aslotted end 32 which mounts a tension spring 33,th'e same being connected to a similarly'slotted extension 34 of the mid-portion 24. The cam portion 31 is engaged bythe end 18 of the adjustable focusing member and such engagement is maintained by the spring 33. Turning the threaded member 16 causes tilting movement of the socket 21 upon the pivots 26, thus raising or lowering the filament of the light bulb into the desired position.

In Fig. 3 like parts are similarly numbered. ,Thus, the casing 10 supports the axial adjusting screw 13 and the tilting ad-' justing screw 16 having the end 18 for enaging a spring cam portion 131 secured by rivet 130 to the socket 21 positionable in the aperture 20 of reflector 19. Rivet 130 also secures a spring 133 which bears upon a portion 134 for normally maintaining cam portion 131 in engagement with the end 18 of the adjusting screw. The socket 21 is pivotally mounted at 126 in the arms 125 of the U-shaped strap having the intermediate connection portion 124 apertured at 127 to receive the adjusting screw 13. The

operation of the device is the sameas in Fig. 1.

In Fig. 4 like parts are similarly num bered. Thus, the casing 10 supports the.

to receive the adjusting nut 13. A plate 129 is slotted at 128 to form the depressed tongue or cam 231. The mid-portion 224 and adjacent end of plate 129 include projecting portions extending towards each other, both being indicated by the numeral 232 and between and upon which is mounted coil spring 233. The function of the several parts is substantiallythe same as that heretofore described for the embodiments shown in Figs. 1 and 3. v

The invention claimed is:

1.- In a focusing l'amp including an apertured reflector, an apertu red casing in spaced relation therewith, and a lalnpbulb socket mounted in the reflector aperture for universal movement thereon, and extending to- .ward the casing, the combination of a U- shaped strap having its midportion posi tioned between the, socket and the casing and its arms extending towards the socket and hingedly connected ,-therewith, a cam forming strap having one end rigid withv the socket and extending rearwardly be tween the arms of the. U shaped1 strap, 'resilient meansinterposed between the straps andlnormally constraining the socket and cam toward one position, atubular threaded device'positionable in -the casing aperture and having threaded connection atits inner portion with the Ushaped strap midportionacterized by the resilient means including a strap portion for anchorage and a resilient portion having one end operatively associated with the U-shaped strap mid-portiomf; i 4 said resilient strap supporting portion and a g i said cam strap consisting of a'single strapf fi including divergingly directed integral portions. 1 V

In witness whereof, I have hereunto 115- l fixed my signature; 1,, r EDWARD G. ALBRIGHT. i

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