US1706759A - Floodlight - Google Patents

Description

March 26, 1929. o, WERNER 1,706,759

FLOODLIGHT Filed June 18, 1927 2 Sheets-Sheet 2 WITNESSES: I INVENTOR Patented Mar. 26, 1929.

UNITED) STAT S PATENT im cs. I I

OSCAR \VERNEB, OF SOUTH BEND, INDIANA, ASSIGNOR TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OEPENTNSYLVANIA.

rnoonmen'r.

Application filed June 18,

vices and more particularly to focusing means for floodlights and similar apparatus.

Hitherto fioodlights have beentprovided with universally adjusted focusing devices such as that shown in Patent No. 1,612,828 to John R. Townsend and assigned to the l/Vestinghouse Electric & Manufacturing Company. Improvements are desirable since it is dillicult to clean reflectors in housings provided with such devices without disturbing the focusing adjustments, since the focusing adjustments may be simplified, and since the lamps may be broken by contact with the reflectors in case of improper adjustment of the focusing screws.

The lamps used infloodlight projectors are usually provided with concentrated filaments zigzagged vertically around suitable supports iuarcs of about 240. Although the filament is concentrated, it occupies a relatively large space rather than a point. Because the filament is arranged inless than a full circle its projected area on the reflector will be small when the lamp is in one position and a narrow beam will be produced. When the lamp is'rotated through a larger area of filament will be presented to the reflectorand a comparatively broad beam will be projected. In order to select the type of beam desired, it is necessary to turn they lamp. Other wellknown types of concentrated filament lamps maybe usedlout the same effect is produced.

Therefore, one of the objects of my invention is to provide a focusing device which will permit such rotative movement of the lamp that anydesired position of the filament with relation to thereflector maybesecured without disturbing the focal adjustment.

Another object of my invention is to provide a. focusing device which shall permit full vertical, horizontal and lateral adjustment of the lamp. 1 a

Another object of my invention is to pro- .vide a focusing device such that the lamp may be moved away from the reflector to permit 1 the reflector and the lamp to be cleaned and then returned into place without disturbing the focal adjustment. a

Another object of my invention is to provide a focusingdevice so constructed that cusing device t is mounted.

. housing 8.

1927. 'seriarno. 199,651.

y being driven A still further object of my invention is to provide a focusing device adjustable from outside the projector housingso that the housing may be made moisture proof.

Myinvention may be better understood by of positve, convenient and exact adjustment.

referenceto the accompanying drawings in Y which like numerals indicate like parts.

F igure 1 1s a sectional view ofa projector that is provided with my focusing device;

Fig. 2 is an enlarged side elevational' view of my focusingdevice, i

Fig. 3 is a side elevati aken at 90 to that inFig. 2, and A, I I

Fig. 4 is a bottom plan view of my focusing device taken along the lines -IVIV of Fig. 2.

Referring more particularlyto the drawings, the housing (Fig. 1) is mounted on the base 1 that is provided with a slightly concave upper surface 2 and a yokemember 3 onal view of my fo-' that is mounted to rotate on the base on a washer 4. -Theyoke may be rotated through 360 and any, desired friction between yoke and base may be secured by adjusting the bolt 5. t i i Arms on. the yoke 3 are secured by means of wing nuts 6 to the diametrically opposed pivots 7 on. the projector hOusingS.v -This arrangement of the yoke 3, the projector housing 8 and the base 1 provides for directing the light beam in any direction and a any angle when the supportingmembers are suitably adjusted. I

The projector housing 8 is a'substantially hemispherical or dish-shaped member. which may be of any suitable cast or otherwise fabricated metal or n'iaterial. ()n the rear portion of the housing, japarabolic reflector 12 The reflector may be coated with a reflective surface of silver orother suitable metal and it is secured to the housing by means of a" flange 13' which engages projections ll onthe' inner surface ofthe The face of the housing is provided with an apertured door that is provided with a channel portion 17 near its peripheral. edge in which the peripheral edge 21 of the housing fits. A gasket 22 of rubber, telt or other suitably compressible material is mounted in the channel 17 so that a substantial moisture and dust-proof oint will be formedwhen the door is closed and no dust or moisture can enter the housing.

In the inner peripheral surface of the door frame is provided another channel 23 in which is seated another resilient gasket The gasket servesas a bed or cushion for the light-transmitting lensor plate 24 and completely closes the. aperture in the door frame. The lens or plate24 is tightly held in position against the gasketby clips 25 which are attachedtothe 'frame by means of screws 26 or other suitable fasteners.

The-door frame is provided with plurality of lugs 27 that are resilientlysecured to co-acting lugs 28 on the housing for resiliently engaging the trameand housing and thereby eli'ectinga convenient, positive, secure, dust and moisture proot closure between the door and the housing.

Extending from the upper portion of the housingf is atubular portion 29 that is closed by a-cap or-cover 30. ihe cap '30 is fastened to the tubularportionby suitable fastening means, such as bolts 31, that are passed through-its peripheralflange 32 and engaged with the flange33 oil the enlarged tubular a 0 portion of the housing. The cap 00 is provided witha' threaded opening 34 in the cen- "ter thereotin which a vertiail adjustment screw 35 5s mounted. Two adjusting screws 36 and 37 are screwedinto the cap near the oeri'her thereof. The focal ad ustment Y,

screw 3'6'is in'the'rear'of the central adjusting screw 35 and-the other, the lateral adustment screw '37, is situated at an angle of 90totheposition of screw 36.

On'the inner-end of the central adjusting screw isa hemispherically-shaped washer 38 which constitutes a ball-and-soCket joint with a depression 40 inthewabble plate 39. The wabble plate 39 is provided with an upstruckportion 41 for mounting a; spring 42 between the wabble plate 39 and the cap 30.

The spring 42 is undercompression at all times and holds the wabble plate 39 against the ends of thelateral and focal adjustment screws. If one of the adjustment screws is moved inwardly or outwardly, the -wabble plate'responds immediately to the change in the adjusting screws.

A radial slot 43 is provided in the edge of the wabble plate 39 and upstruck members 44a1re provided on each side otthe slot. A projection or guiding member 45 on the cap 30 extends downward fromthe capthrough the slot 43 in the wabble plate and prevents the wabble plate from turning.

A secondary plate 46 upon which the lamp socket 47 is mounted has two arcuate openings 48 near its periphery through which the bolts 49 are passed for holding the secondary plate 46 on the wabble plate 39. The bolts 49 are provided with spring clip washers 50 so, that the pressure of thesecondary plate on the wabble plate may be regulated, and the resulting friction between the two plates may be utilized to maintain the secondary plate 46 in any desired position against the wabble plate 39 when bolts 49 are adjusted. The arcuate openings permit the secondary plate 46 to be rotated through an angle so that the desir dfilament-position and beam spread may be obtained. I p v The bolts 49 are so adjusted'that the triction between the wabble plate and the secondary plate is less than the l rictionbetween the socket 4? and the base'o't the lamp 52. VJhen the lamp is screwed into the lampbase', the secondary plate 46 rotates until it strikes the bolts 49, and. the bolts 49 prevent further rotation of the plate. When the lamp has been screwed into place in the socket, the lamp and the secondary plate 46 may beretated in the opposite direction to adjust the filament. In unscrewing the lan ip, the secondary plate willrotate until the opposite ends of the arcuate slots strike the bolts 49 and further rotation of the plate willbe prevented.

In focusing the lamp, the desired elevation of the filament is secured by regulating plate 39 in co-operative engagement with'the lateral and focal adjustment screws 36 and 37, but, when desired, the lamp 52 maybe moved forwardly against the spring 42 for cleaning the reflector-and returned without disturbing the focal adjustment.

It is to be noted that the comparatively weak spring 42is the only means for impelling the lamp toward the reflector so that, when the spring is suitably proportioned, the danger of crushing the lamp by driving it against the reflector is avoided. 7

Although I have described a device embodying a specific form of my invention, I do not wish to be limitedthereto sinc c modi- :[ications will suggest themselves to those or the position of the adjusting screws may be changed. Still other modifications may be made without departing from the spirit and scope of my invention as defined in the ap-' between said. cap and said wabble plate.

2. A focusing device comprising a cap, a vertical ad usting screw threaded through said cap, a wabble plate movably supported on said vertical adjusting screw, a focal adjustment screw and a lateral adjustment screw-threaded through the rim of said cap, a spring engaging said cap and wabbleiplate, to cause the wabble-plate to engage one of the adjusting screws, a secondary'plate rotatably mounted on said wabble plate and, alamp socket mounted on said secondary plate.

3. A focusing device comprising a cap, a vertical-adjustment screw threaded through said cap, a wabble plate movably supported on said vertical-adjusting screw, a focaladjustment screw and a lateral-adjustment screw threaded through the rimof said cap, a compression spring oppositely disposedon said cap from said focal-adjustment screwi and said lateral-adjustment screw,'a second ary platerotatably mounted on said wabble plate and a lamp socket mounted on said secondary plate. I

4. A focusing device comprlsing a cap,.a

Vertical-adjustment.screw threaded through the center of said cap, a lateral-adjustment screw anda focal-adjustment screw threaded through the rim of said cap and placed at right angles with respect to each other and the vertical-adjustment screw, a guiding member fastened to said cap, a wabble plate mounted on vthe end of the vertical-adjust ment screw by aball-and-socket joint, and

projections mounted on said wabble plate for engaging said guidlng member.

p '5. A focusing device comprising a cap, a vertical-ad ustment screw threaded through the center of said cap, a lateral-adjustment screw and vertical-adjustment screw threaded through the rim of said cap and placed at right angles with respect to each other and the vertical-adjustment screw, a guiding member fastened to said cap, a wabble plate mounted on the end of the vertical-adjust mentscrew by a ball-and-socket joint, projections mounted on said wabble plate for engaging said guiding member, a secondary plate provided with arcuate slots, bolts adaptedtopass through said arcuate slots to en gage said wabble plateand a socket mounted on said secondary plate.

In testimony whereof,vI have hereunto sub scribed my name t-hisseventh day of June,

OSCAR WERNER.

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