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Publication numberUS1699078 A
Publication typeGrant
Publication dateJan 15, 1929
Filing dateJan 8, 1926
Priority dateJan 8, 1926
Publication numberUS 1699078 A, US 1699078A, US-A-1699078, US1699078 A, US1699078A
InventorsReadeker William C
Original AssigneeReadeker William C
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Ventilator for motion-picture machines
US 1699078 A
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Description  (OCR text may contain errors)

Jan. 15, 1929. 1,699,078


W. c. READEKER vsunuron FOR uouou rxcruna ucamas File n- 1926 2 Shasta-Sheet 2 llllll i ii INVENTOR William (T Real/015w Patented Jan. 15', 1929.




Application filed January 8, 1926. Serial- No. 79,918.

This invention relates to an improved ventilator for motion picture machines, and has for its primary object to provide simple and inexpensive means for ventilating the interior of the casing or cabinet and more particularly the lamp housing therein so that overheating and possible combustion of the inflammable motion picture film will be obviated. i

It has heretofore been the general practice to circulate relatively cool air within and through the casing or cabinet of the motion picture apparatus. This method, however, produces a high suction at the air inlet openingso that dust, dirtand other foreign matters are drawn into the casing and collect upon the parts of the mechanism. Also, the temperature in the immediate vicinity of the lamp is not greatly reduced.

In a preferred embodiment of my present invention the ventilator is in the form of a suction fan fixed on the shaft of the operating motor for the mechanism of the projection machine and mounted and arranged with relation to the end of an outlet conduit in di-v rect communication with the interior of the lamp housing. Preferably, this lamp housing is open at its bottom and the operating motor is mounted adjacent thereto so that the hot air generated by the operation of the motor will also be .withdrawn through the lamp housing. Inthis manner, therefore, it will be seen that instead 'of supplying cool air under pressure to the interior of the casing.

form, construction and relative arrangement of its several parts, as will be hereinafter more fullydescribed, illustrated in the accompanying drawings and subsequently incorporated in the subjoined claims.

In the drawings, wherein I have illustrated one simple and satisfactory embodiment of the invention, and in which similar reference characters designate corresponding parts throughout the several views,

Figure 1 is a vertical sectional view through a portion of the casing or cabinet and the lamp housing, showing the application of my present improvements thereto;

Fig. 2 is a horizontal sectional view taken on the line 2-2 of Fig. 1, and

Fig. 3 is a vertical sectional view taken on the line 3-3 of Fig. 1.

Referrin in detail to the drawings, 5 designates the rear wall of the casing or cabinet within which the moving picture projection mechanism is contained and 6 the top wall thereof. The rear wall 5 adjacent to its lower end is provided with an air outlet opening 7 therein.

lVithin the casing the lamp housing 8 is suitably mounted, said housing at its upper end being provided with a cover 9 extending through the top wall 6 of the casing. Upon the front wall of the lamp housing 8 a lens holder 10 of any approved construction is suitably mounted. The bottom wall of said housing has an opening 11 therein beneath which a suitable supporting plate 12 for the lamp receiving socket 13 is disposed, said plate having its ends fixed to the bottom wall of the housing. The socket 13 may be of any approved construction and receives a high powered electric lamp bulb 14, the filament of which is properly centered in opposed relation to the objective lens carried in the holder 10.

The rear wall of the lamp housing 8 at its upper end is provided with a horizontally extending slot or opening 15 which affords communication between the interior of said housing and the upper end of a vertically extending conduit 17 formed by the vertical wall 16 of apressed or stamped sheet metal structure. This rear wall 16 of said sheet metal structure extends upwardly between the rear wall of the lamp housing 8 and the wall 5 of the casing and is suitably fixed to said housing wall as by means of the screws indicated at 18. Said structure also includes a relatively short vertically disposed front wall 19 having lugs or cars at its upper end fixed to the bottom wall of the lamp housing at the rear side of the opening 11 by means of the screws 20. The rear wall 16 of this sheet metal conduit structure at its lower end is provided with an opening 21 therein concentrically related with the opening 7 in the rear casing wall.

Vithin the casing or cabinet and prefer: ably immediately beneath the lamp housing 8, the operating motor 22 for, the light shutter and the projecting mechanism is arranged. As any suitable operating connections between one end of the motor shaft and this mechanism may be provided, such connections are not herein illustrated. The other end of the motor shaft indicated at 23 extends through a suitable opening in the front wall 19 of the vertically disposed conduit structure and has fixed thereon a suitable suction fan 24 which operates in said lower end of the conduit and within the opening 21 in the rear wall thereof.

In the operation of the picture'projecting machine thus equipped :with my present improvements, it will be apparent that when the motor 22 is started, a high suction effect is producedby the fan 24 at'the lower end of the conduit 17. Thus, the very high degree of I heat given off-from the high powered lamp leis continuously withdrawn from the interior of the lamp housing8 through the opening 15 in the rear-wall of said housing, and

hence downwardly through the conduit 17 and is driven outwardly at the rear of the easing or cabinet through opening 7. The very high suction-induced in the operation of the fan 24% likewise is sutlicient to withdraw from the interior-of the cabinet or casing in the vicinity of the motor 22, the hot air generated in the operation of said motor, such hot air bedrawn upwardly through the opening 11' in the bottom wall of the lamp housing. Thus, by withdrawing and discharging from the casing or cabinet of the machine the hot air created both by the motor 22 and the lamp 14, the interior of thelamp housing and the casing is-maintained at a uniformly low temperature so that the danger of spontaneous combustion of the film will bev entirely ob- I viated.

From the above description, it will be seen that Ihave produced a very simple ventilator for motion picture apparatus which may be operated without additional power and is readily applicable to various types of such machines now in common use. Further, it will be appreciated that owing to the simplicity of the sheet metal conduit structure which privilege of resorting toallsuch legitimate changes therein that may be fairly embodied within the spirit and scope of the invention as claimed.


l. In-combination-with a case for motion picture apparatus and a lamp housing mounted :thereims a conduitaentending between one side of the lamp housing and an adjacent wall of the case and having apart projecting below the lamp housing, the case wall and the adjacent avail of the conduit at the lower end of the latter having coinciding air. outlet; openings, and the housing wallhaving an air outlet opening communicating. with the other end of'the conduit,- an operating motorzfor the projecting apparatus mounted in said case and having its shaft extended into the lower end :of said conduit, and atsuctionfan on said end of i the motor shaft operating tin. the conduit to withdraw hot air: fromith'e lamp housing;

2. In combination with aicase. for motion; pictureapparatusand a lamp:housingmounte ed insaidcaseand open 'at:its'lower 'end,='.a conduit extending beween one: side 10f the lamp housing and the'wall ofsaid case,- said" conduit having spaced walls fixed-.tot-h'elamp: housin and projecting below theisa-me, said lamp housing communieating-withthe .inte rior of the case through theopenaend thereof, 'andthe-wall of thelamp housingbeingpro videdwith an ai-r outle't opening;communieeating with. the otherend of said. conduit; an operating-motor for "the" prQ ecting' mechanism mounted withrntthe case and havlngvits shaft projecting intothe loweriendcf said conduit, and a suction fan fixed to the motor." shaft and operating in fsaid 'conduitto withdraw hot air from theinteriorv'of the .case and the interior of the lamp housing through said outlet opening.

3 In combination .with a. lamp housingifor motion picture apparatus,xa conduit extending over? one side of'thfe lamp housingia'nd having an end-portion projecting.lon itudinally from the lamp .=housing, .said ;conduit' havin spaced WZLl lS'fiXQCl TQS ectivel to the side wall and oneend wall of the housing, and

said side wall of th'elam a housing havin an air outlet opening comnrunicatingwith one end of-said conduit, and the other end ofi'said conduit adapted .to 'rece1ve a suction fan to withdraw air. through said opening from the" lamphousing,and one side wall o-f theconduit at its latterend having an opening;.therein through which the air isexpielled:

In testimony thnt lJcla-rm theiforegor my inventionfl have signedz name hereto.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2468565 *Feb 19, 1946Apr 26, 1949Evan J AntonStill picture projector
US3642361 *Nov 15, 1968Feb 15, 1972Hellige & Co Gmbh FIllumination of projecting apparatus
US4682868 *May 31, 1985Jul 28, 1987Constantin Systems, Inc.Thermal management system for an episcopic image projector
U.S. Classification352/202, 353/57
International ClassificationG03B21/16
Cooperative ClassificationG03B21/16
European ClassificationG03B21/16