US1723200A - Plate support for color-projection machines - Google Patents

Description

Aug. 6, 1929.

A. J. OBERG ET AL PLATE SUPPORT FOR COLOR PROJECTION MACHINES Filed Aug.l8, 1928 N E TOR-i A 1 0/1 die/57 /r/ Indy/22?, Shel? BY ATTORNEY.

Patented Aug. 6, 1929.

' UNITED STATES PATENT OFFICE.

ANTON J. OBERG AND ROBERT STOEFEN, OF LOS ANGELES, CALIFORNIA.

PLATE SUPPORT FOR COLOR-PROJECTION MACHINES.

Application filed August 18, 1928. Serial No. 300,500.

This invention relates to improved means for supporting the plates of color projecting machines and for propelling said plates, also to improved means for holding in place between transparent plates an intermediate colored plate.

An object of the invention is to support the intermediate colored plate or plates in simpler or more eflicient manner.

Another object of theinvention is to provide improved means for mingling white light with colored light in such a manner as to produce novel and more attractive spotlight effects. I

Still another object of the invention is to produce simpler and more dependable means for rotating the colarprojecting plate in combination with simplified means, for supporting said plate and guiding it during its rotary movement.

Other objects and advantages may hereinafter ap ear.

Referring to the accompanying drawings which illustrate a preferred embodiment of the invention,

Figure 1 is a front view of spotlight color wheel embodying the invention and illustrating also the means for rotating said wheel. and for guiding its rotational movement.

Figure 2 is a partial cross section, the line of section being indicated by the line 2-2 of Figure 1.

Referring in detail to the drawings, our newly invented spotlight color wheel includes a central glass disk 5 having a plurality of colored sectors 6, the color of each sector being diiierent from the colors of adjacent sectors. Along the margin. of each sector is provided a plurality of preferably semi-circular transparent spots 7 being distributed in any suitable manner to cause white light to mingle with colored light when the disk is rotated.

Against one side of the central colored disk 5 is fitted a transparent retaining disk 8 and against the other side thereof is fitted a 00- operating transparent retaining disk 9. Around the three disks 5, 8, and 9 extends a supporting ring 10 having a keeper flange 11 on one side which abuts against the outer face of disk 8 and nearits other side a groove 12 within which is seated a resilient, nearly complete ring 13 which retains the disk 9 in place. Each of the free ends of said ring is provided with an inwardly bent finger-hold let to aid in manually removing and replacing the ring 13.

On ring 10 is provided a peripheral toothed portion 15 with which cooperates a toothed pinion 16 secured to the driving shaft 17. Said driving shaft 17 is supported by a hearing 18.

The retaining ring 10 is provided at about its mid-width with an external peripheral groove 20 with which. cooperates a guidin wheel or disk 21 loosely mounted on the en portion of shaft 17 and held in place upon said shaft by a nut 22 secured to the outer end of said shaft. WVithin disk 21 is a bushing sleeve 23. A washer 24. is interposed between nut 22 and theou'ter end of said sleeve, said washer aiding in retaining the rotatable wheel 21 in place.

At each side of the main rotary element is mounted an auxiliary guiding disk or wheel 25 which is supported on an auxiliary shaft 26 said guide wheels 25 also engage the groove 20 of ring 10.

In the embo-dimentof the invention illustrated in the drawings the colored disk 5 is illustrated as being made up of a series of dilferently colored areas or segments 6 which are grouped around a central set of colored areas 6, the four last mentioned colored areas being each of a triangular shape and being so arranged as to form a square.

It is to be understood that the invention is by no means limited to any particular grouping or arrangement of the areas of colored glass provided in order to produce the desired color effect. Variously sha 36d fragments of glass plates maybe placed etween the outer plates 8 and 9 and securely retained in place by means of the annular flange 11 and the re taining ring 13 which'cooperates therewith.

In the illustrated embodiment of the inven tion the pieces 6 and 6 of differently colored glass which comprise the intermediate disk 5. are symmetrically shaped and are fitted to each other along their margins, being cut away at their edges to form the uncolored spots 7 I Owing to the fact that the uncolored spots 7 are semi-circular in shape and are located in the edge portions of the glass plates which form the component parts of the colored glass disk 5, said uncolored spots may be readily provided for by grinding away an edge pertion of a plate Wherever it is desired to form an uncolored spot, the grinding Wheel used for this purpose sing reiatively narrow and having its periphery conv Bled from side to side to iit into the completed semi-circular cut-away portions.

The operation Will be readily understood from the foregoing descript'on. ihe toothed pinion 16 carried by tie drivin shaft 17 imparts rotary movement LO the supporting ring;

lO'tonether with glass eien'ients carried th eby be no; guided and kept onal movement not 21 therebeneath, but de Wheels 25.

in place oniy by vVe claim:

1. In a devic to transmit colii enoage each side ring encircling all of seit circmnferentiai rota k and an in al groove near th other side, a retaining 112? to engage said plates in lace Wit in said SflppOTtiIlfl a drive sl' t, a pinion mounted on said shaft and operatively said ring; to rotate the iatter, said ring havin an nernal circumferential groove, and a guide disk mounted on shaft and said groove.

, d iingle tincolored light with colored light,the spots uncolored light thus provided being night on one side and curved on the opposite side. 1

In testimony whereof We affix our signatures.

colorc r light, and means to rotate said disk to ANTON J. OBERG. ROBERT R. STOEFEN.

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