US1286269A - Apparatus for motion-picture projection and other purposes. - Google Patents

Description

w. v. FOLEY. APPARATUS FOR MOTION PICTURE PROJECHON AND OTHER PURPOSES.

' APPLICATION FILED FEB. 14.198. 1,286,269. Patented Dec. 3, 1918.

INVENTOR Wm M)" @r/ ATTORNEY WILLIAM VINCENT FOLEY, OF NEW BRUNSWICK, NEW JERSEY.

APPARATUS FOR MOTION-PICTURE PROJECTION AND OTHER PURPOSES.

Specification of Letters Patent.

Patented Dec. 3, 1918.

Application filed February 14, 1918. Serial No. 217,083.

'To all whom it may concern:

Be it known that 1, WILLIAM VINCENT FOLEY, a citizen of the United States, residing at New Brunswick, in the county of Middlesex and State of New Jersey, have invented certain new and useful Improvements in Apparatus for Motion-Picture Projections and other Purposes, of which the following is a specification.

This invention relates to apparatus for motion-picture projection and other purposes, and is especially useful in effecting the reflection of light rays from an incandescent electric lamp through a condensing lens on a moving-picture film or other object or material to be either illuminated or sub jected to the action of reflected light rays passed through a condensing lens.

The objects of the invention are first to increase the accuracy of adjustments of the source of light and of two separate reflecting elements, each in relation to the others; and secondly, to improve the ventilation of the lamp house and thereby prolong the efficient life of the lamp and reflecting elements.

In the accompanying drawing forming a part hereof, I show my newlamp house construction in vertical central section and in connection with certain parts of a typicalmotion-picture projecting apparatus.

Referring to the drawings, 1 is a supporting frame or casing shown in a form commonlyknown as a lamp house; 2 an incandescent electric lamp bulb having a threaded socket member 3 which screws into a vertical interiorly and exteriorly threaded socket member 4 that is lengthwise adjustable in a collar 5 fixed to the upper wall of the lamp house concentrically with a hole through the wall. The lamp filament is indicated by 7. Forwardly of the lamp at a proper distance understood by all skilled in the art, the lamp house is provided with a forwardly-extending lens tube 8 wherein is placed a duplex condensing lens comprising in the preferred form of the invention a pair of lano-convex lenses 9, 9 spaced apart with their convex sides opposed. The long axis of the lamp is at right angles to the principalfoc al axis of the duplex condensing lens, or what is the same thing,'to the axis of the lens tube. The inner side of the bottom wall of the lamp .house is provided with a lengthwise extending dovetailed groove forming a guideway 10 parallel and lens tube. The upstanding support 11 of a forwardly and outwardly flaring tubular reflector which in its preferred form is the annular spherical zone-shaped reflector 12, has a dovetail foot 13 which fits slidably in the dovetail guideway. The support 11 has a hole through which the front end portion of an adjusting rod 14 is loosely mounted and held in place by a head 15 at the front and a collar 16 at the rear side of the support. The adjusting rod is rearwardly threaded at 17 and passes through a threaded boss 18 in the rear end wall of the lamp house exteriorly of which it has a knurled head 19. spherical zone-shaped reflector there is a concave reflector 2.0, preferably a parabolic reflector, to the center of which the axis of the condenser lens tube is perpendicular. This parabolic reflector is held in a crosssectionally round support 21 to the back side of which a rearwardly-extending adjusting rod 22 is fixed, the rod being rearwardly threaded at 23 and passing through an interiorly-threaded boss 24 fixed in the rear wall of the lamp house exteriorly of which it has a knurled head 25.

The diameter of the parabolic mirror support 21 is slightly less than the interior diameter of the rear end opening'26 of the annular spherical zone-shaped reflector, and the parabolic mirror may be moved in and out through such opening 26 for the relative adjustment of the reflecting surfaces of the parabolic and zone-shaped reflectors. Relatively to the filament 7 or point of light, the

zone-shaped reflector is adjustable by the screw 14.- and the parabolic mirror is adjustable by the screw 24, the filament being adjustable to the principal focal-axis of the condenser lenses by the threaded socket member 6 in the fixed collar 5.

The lamp house is desirably ventilated according to one feature of this invention by means of an air-pipe 27 the discharge end of which is adjacent the metal lamp-socket members within the chamber of the lamp house, the upper wall of which is provided with an air-escape port 28 between which and the discharge end of the air-pipe the socket members are located. Exteriorly of the lamp house the air pipe is provided with a fan 29 which draws exterior air into the pipe and forces it into the metal socket members, the cooling current thus set up entrain- Back of the annular,-

preferably out of contact with the socket member of the lamp. Thus air spaces are obtained between the reflectors, the lamp, and the lamp house walls, and the rising hot air within the lamp house chamber and around the reflectors and the lamp is entrained by the forced air current at the top of the chamber, and forced out through the port 28. @verheating of the lamp house chamber re sults in undue shortness of life ofelectric lamps therein and also tends to impair the silvering of the reflector backs or exterior surfaces when the reflectors are of silvered glass. 7 v

What I claim is:

1. lin a lamp house, the combination of a parabolic mirror having a threaded tang extending outwardly through a wall of the lamp house chamber, said .wall, being provided with a threaded bearing for said tang; j

an outwardly flaring mirror provided with a projection having a dove-tail foot, an exaacaaee tail Ways for said foot; and an incandescent electric lamp socket which comprises an eXteno-rly-threaded socket member entrant through an opening in the wall of the lamp house chamber aninteriorly-threaded re ceiving collar 1 eXteriorly-threadedsocket member being interiorly threaded, and another lamp socket member which is exteriorly threaded for assemblage with the interiorly-threaded Wall of said exteriorly-threaded socket member; the outwardly flaring mirror having an edge recess 'for reception of such assembled socket members.

2. In a lamp house, an air-delivery pipe having its delivery; end within the chamher; a wall of the lamp househaving an electric lamp socket-receiving opening adj acent the -dclivery end of said. pipe; an electric lamp located with its socket adjacent the delivery end of said pipe'and in the path of an air. current issuing therefrom, the wall of the lamp house having adjacent said socket-receiving opening an air-exit opening opposite the delivery end of the pipe whereby that portion of the lamp socket within the chamber of the lamp house is directly in teriorly accessible adjusting screw and doveor said socket member, said the air currentflowing fromthe pipe against and around lamp socket and out through the adjacent} r-exit.-

In testimony whereof l have hereunto set my hand this Qtlida'y of February,*19l8,

WlllliLllAM VINCENT FOLEY.

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