US1667724A - Portable motion-picture projector - Google Patents

Description

May 1, 1928. 1,667,724

H. A. DE VRY- PORTABLE MOTION PICTURE PROJECTOR Filed Auz. 1 1924 YM 75 M Patented Mayl, 1928.

- UNITED STATES PATENT OFFICE.

.313! A. m: VBY, or CHICAGO, ILLINOIS, AssIGNon 1 0 THE m1 vex conrom- HON, or CHICAGO, ILLINOIS, A CORPORATION or ILLINOIS.

PORTABLE MOTION-PICTURE PROJECTOR.

' Application fil ed August 15, 1924. Serial No. 732,148.

The invention relates to portable motionpicture projectors.

In the use of portable or self-contained motion-picture projectors of the type exemplified in Patents Nos. 1,303,543 and 1,287,576, the machine is usually operated by resting, without fixedly securing, the projector-c'ase on a support, which results .in noise and vibration. In carrying the machine about, the case is frequently subjected to shocks which have a tendency to disturb the accurate adjustments which are to be maintained in the several units of the machine.

The primary object of the present invention is to provide a motion-picture projector of this type, in which provision is madefor eliminatin so far as possible, the noise resulting rom the operation of the moving mechanisms, such as the film-feed mechanism and the motor, and the shock to such parts frequently occurring in the transportation of the machine. Furthermore, by eliminating the' vibration which produces this noise, the vibration of the picture on the screen, resulting from vibration of the case, is prevented.

This object is attained by cushioning the operating parts'in the case, so as to prevent the shocks, to which the case is subjected, from being transmitted to the operative units and b preventing .the vibration of the case from the operation of the rapidly moving parts.

The invention consists in the several novel features hereinafter set forth, since these may be modified within the scope of the appended claims, without departing from the spirit and scope of the invention.

In the drawings: Fig. 1 is a side elevation of a motion-picture projector embodying the invention, the hingeddoor, forming one side of the case, being shown in its open position. Fig. 2 is a section on line 2-2 of Fig. 1, showing one of the resilient mounts for the electric motor.' Fig. 3 is a section on line 3-3 of Fig. 1, showing one of the resilient su porting devices for the supportingsframe f nism. Fig. 4 is a erspective view of the elastic bushing of ,ig. 2.

The invention .is exemplified in a motion picturev machine of the self-contained portable type, in which all of the units are or the film-feed mechacomprises a back-wall, ront, rear, top and bottom walls and a door 5 hinged to the back-wall and forming a side closure for the case. A lamp-house 6, containing a lamp 7, is suitably mounted in the upper rear portion of the case. A frame 8, in which the projecting lens-holder 10, intermittent and continuous film-feeding mechanism -and the pressure-gate 9 for the film are operatively mounted, is disposed in the upper front corner of the carrying-case. Supply and take-up spools 11, coaxially arranged, are disposed in the lower portion of the case. An electric motor 12, connected to drive the film-feeding mechanism and takeup spools, is disposed in the lower rear portion of the case. The details of the filmfeeding mechanism, lamp-house and their associated devices may be of any suitable construction, such, for exam 1e, as those exemplified in the aforesaid etters Patent Nos. 1,303,543 and 1,287 ,576 to which reference may be had for a detail exemplification of these devices.

The casing of the motor 12 is provide with lugs 13 in suitabl number, each of which is provided with a vertical opening 14. An elastic bushing or sleeve 15, formed of suitable rubber, extends through the hole 14 in each lug 13. This bushing is reduced in diameter", as at 16, where it passes through the lug and is enlarged or flanged at its top and bottom, as at 17 and 18, so that the bushing will lap the top and bottom of the lug. A hole 19 extends through each bushing and the metallic sleeve comprising a head 20 and a hollow stem or post 21. The head 20 is interposed between the lower flange 18 of the bushing and the bottom of the case 4. The post 21 extends through hole 19 and is outwardly flanged, as at 22 to hold a washer 23 against the top face of the elastic bushing 15. "A screw 24 extends through the bottom-wall of the case 4 and is threaded to the inner periphery of the post 21, to secure the metallic sleeve fixedly in the case. The elastic bushings 15, which are interposed between the lugs 13 and the metallic sleeves, serve to resiliently support the electric-motor 12 in substantially fixed relation, but in such manner that the vibration of the motor be absorbed by the IOU - the motor in its correct posltion, and so it will be cushioned for the purposes stated. Furthermore, any shock to which the carrying-case may be subjected will be absorbed by the bushings, so that it will not be transmitted to the motor.

The frame 8 comprises a front-plate 8 andi a back-plate 8 which are suitably and rigidly cross-connected to form supports for the film-feeding mechanism. This frame is supported entirely from the back-wall of the case 4 and for this purpose the back-plate 8 is provided with four outwardly extending integral lugs 8. The back-plate 8 is usually formed of sheet metal and each lug 8 comprises'a cylindrical portion 8 a back marginal flange 8 and an inturned flange 8?. An elastic bushing 30 is held in each of said lugs, being annularly grooved, as at 31, to receive the inturned flange 8, whereby the bushing will be held against longitudinal movement in the lug. The bushing extends inwardly and outwardly from the groove 31, so that the lug will not have any bearing against the metallic device for supporting the elastic bushing. Each bushing 30 is supported by a metallic sleeve comprising a head 32 and a post 33. Head 32 bears against the back wall of the carrying-case 4 and the inner end' of the bushingand the post extends through a longitudinal hole in the bushing. A screw 34 extends through the back-wall of the case 4 and is threaded to the inner periphery of the post 33 to clamp the metallic sleeve firmly to the case. One end of the post 33 is flanged outwardly, as at 35, to secure awasher 36 against the front end of'the bushing. By means of this construction, the rubber of the elastic bushing may be compressed to the desired degree to support the frame 8 with suflicient rigidity for correct operation. By means of these cushioningdevices,. theframe 8, which carries the rapidly rotating parts on the film-feeding mechanism, will be supported in the case, so that the vibration of the frame will be absorbed by the bushing and will not be transmitted to the case. In practice, it has been found that vibrations imparted to the case produce a soundingboard effect. Any shock to which the carrying-case is subjected will be in a measure absorbed by the bushings 30, sothat the oper-' ative parts in the frame Swill not be subjected to the direct eflect of such shocks.

The invention exemplifies a motion-picture projector of the portable type, in which provision is made for. reducing the noise, re-

sulting from the operation of the parts in the case, the vibration of the arts and for cushioning the parts against s ocks to which the carrymg-case may be subjected in transportation.

The invention is not to be understood as restricted to the details set forth, since these maybe modified within the scope of the appended claims, withoutdeparting from the spirit and scope of the invention.

Having thus described the invention, what I claim as new-.and desire to secure by Letters Patent, is:

1. In a motion-picture projector, the com bination of a portable carrying-case, filmfeeding mechanism operatively mounted in the case, means in said case for driving said mechanism, a v frame in. which the parts of said mechanism are mounted provided with lugs at one side thereof, said lugs having cylindrical portions, and resilient supporting connections between the frame and the carryingcase to prevent transmission of vibrabination of a portable carrying-case, filmfeeding mechanism operatively mounted n the case, means in said case for driving said mechanism, a frame in which the parts of said mechanism are mounted provided with lugs on one side thereof, and resilient supporting connections between the frame and the carrying-case to prevent transmission of vibration, comprising elastic bushings extending through and lapping both sides of said lugs and metallic posts secured to the case and extending through said bushings for supportin the latter.

Signed'at hicago, Illinois, this 13th day of August, 1924. e

HERMAN A, DE VRY.

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