US1991493A - Projector base - Google Patents

Description

Feb. 19, 1935. P. w. CORNELIUS PROJECTOR BASE Filed Aug. 25, 1955 ll 7-. I I3 Inventor,

Pembroke W Ubrnzlius,

Attorneys Patented Feb. 19, 1935 UNITED STATES PATENT OFFICE This invention relates to means for varying the angular adjustment of a base herein shown as that of a. motion picture projecting machine. primary object of the invention is to provide simple means for adjusting the angularity of a base whereby the base may be tilted laterally as well as longitudinally to compensate for uneven supporting surfaces as well as to direct a beam of light, in the case of the projecting machine, either upwardly or downwardly or laterally. Other primary objects'of the invention are to provide a very simple structure which may be operated readily; that may be embodied in a very small and compact space so that the structure may be applied to a portable device without undue weight; and that may comprise but few parts permitting a low cost of production.

These and other objects and advantages of the invention will become apparent to those versed in the art in the following description of one particular form of the invention as illustrated by the accompanying drawing, in which Fig. 1 is a side elevation of a motion picture projecting machine to which myinvention is applied to have the forward side of the base elevated;

Fig. 2, a detail in side elevation on anenlarged scale showing the rear end of the base elevated;

Fig. 3, a front elevation of the adjusting structure;

Fig. 4, a rear elevation, and

Fig. 5, a similar rear elevation with the structure adjusted to rest on a laterally inclined surface.

Like characters of reference indicate like parts throughout the several views in the drawing;

As one particular use of the invention, a motion picture projecting machine generally designated by the numeral 10 is herein shown to have a base member 11. The front and rear ends of this member 11 carry respectively a pair of spaced apart studs 12, 13 and 14, 15. I

I provide a bar 16 with a pair of spaced apart slots 17 and 18 cutdown from the upper edge and spaced apart to permit either pair of studs to be entered therein. The bar 16 is provided with a downturned leg 19 and 20 respectively at each end thereof. I further provide another bar 21, also having a pair of spaced apart slots 22 and 23 cut down from its upper edge to receive either pair of studs therein. Each end of the bar 21 is enlarged and screwthreadedly carries therethrough studs 24 and 25 respectively, the lower ends of which are provided with the feet 26 and 2'7. These studs pass vertically through the ends of the bar and look nuts 28 and 29 are provided respectively on the studs to retain them in desired positions.

Where the front end of the device to be adjusted is desired to be raised or lowered, the bar 16 is preferably placed at the rear of the member 11 to have the studs 14 and 15 extend through the slots 17 and 18 and wing nuts 30 and 31 are screwthreadedly engaged over the outer end of these studs and drawn up snugly to retain the bar 16 firmly against the end of the member 11. The other bar 21 is secured to the forward end of the member 11 by thumb or wing nuts 32 and 33 engaging the studs 22 and 23 which extend through the slots in that bar. Then the studs 24 and 25 may be turned to raise or lower the bar 21 as may be desired, following which the lock nuts 28 and 29, here shown as having a knurled periphery to permit operation by hand, are run down against the bar 21.

Should the supporting surface be uneven laterally or the device 10 be required to be rocked laterally, then the thumb nuts may be loosened on the respective studs to permit the member 11 to be angularly carried between the bars 16 and 21 as suggested in Fig. 5. That is, by allowing for example, the stud 14 to rest at the bottom of the 'slot 17 the other stud 15 may be carried in an upper portion of its slot 18 and the two nuts 30 and 31 drawn up tightly against the bar to retain the member 11 in that relation with the bar 16.

Where it is desirable to do the adjusting from the rear end of the member 11, such for example, as when the beam of light from the projecting machine 10 is to be directed downwardly rather than upwardly, then the bars 16 and 21 may be interchanged to have the bar 21 at the rear and the bar 16 at the front as indicated in Fig. 2. Bymeans of the structure above described, I secure avery convenient and adjusting mechanism all without the use of tripods or the like and at the same time secure a very rigid support permitting a uniform weight to be secured on each of the four legs of the device.

While I have herein shown and described the invention in the one form as now best known to me, it is obvious that structural variations may be made without departing from the spirit ofthe invention and I therefore do not desire to be limited to that precise form beyond the limitations as maybe imposed by the following claim.

I claim:

In a projection machine, the combination with a base having front and rear ends, a pair of spaced apart studs extending forwardly and rearwardly respectively from each of the ends, front and rear and an adjustable foot carried in each end of at I least one of said bars, whereby eitherone or both of the bars may be vertically raised or lowered along the studs with the bar ends rocked or at the same elevation.

PELDBROKE W. CORNELIUS.

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