Projection apparatus for chance selected indicia
United States Patent 2457280

This invention relates to improvements in number projectors, that is to say machines for projecting onto a screen a light beam carrying an image of a number or a series of dots equal to the number, or any other indicia presented .o the beam of light by a revolving member after it has come to...

Seaman, Harold E.
Application Number:
Publication Date:
Filing Date:
Seaman, Harold E.
Primary Class:
Other Classes:
273/143R, 273/146
International Classes:
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US Patent References:
2233134Stereopticon slide1941-02-25
2221063Indication for cash registers and accounting machines1940-11-12
2138821Game apparatus1938-12-06
2108844Stereopticon slide and projection apparatus therefor1938-02-22
2077369Projecting game apparatus1937-04-13
1857902Game apparatus1932-05-10
1695683Mechanical game toy1928-12-18
1584531Stereopticon slide1926-05-11


This invention relates to improvements in number projectors, that is to say machines for projecting onto a screen a light beam carrying an image of a number or a series of dots equal to the number, or any other indicia presented .o the beam of light by a revolving member after it has come to rest, the particular indicia presented depending upon chance.

One of the objects of the invention is the provision of an apparatus for displaying to a larp assembly of people numbers or other indicia selected by chance.

Another object is the provision of a projector of the character stated wherein the manual operating mechanism for determining by chance tl@e indicia projected is not readily susceptible of being rigged.

Another object is the provision of the apparatus of the character stated wherein the image carrying member is a ring which is loosely mounted on a supporting head and arranged to be given a rotative impulse by the head, carrying the ring beyond the angle of rotation of the head.

Other objects and features of novelty will appear as I proceed with the description of that embodiment of the invention which, for the purposes of the present invention, I have illustrated in the accompanying drawings, in which Fig. 1 is an elevational side view partly broken away and partly in vertical section, showing a 3 projector embodying the invention, Fig. 2 is a plan view of the same, Fig. 3 is a front view, partly in section on the line 3-3 of Fig. 1, Fig. 4 is a rear elevational view, 3 Fig. 5 is a face view on a larger scale of the hollow head and the image ring loosely supported thereupon, forming important elements of my invention, and Fig. 6 is a diagrammatical view showing one 4 arrangement of number indicia which may be used in carrying out the invention.

In the drawings I have shown at 10 a base upon which may be secured by means of screws II a sheet metal cover or casing 12. Within this 4, casing there is a framework that may be secured to the base by means of screws 13. In this framework there are mounted two ball bearings 14 rotatably supporting a horizontal shaft 15 which projects rearwardly out of the casing and carries at its free end an operating arm or handle 16.

The forward end of shaft 15 carries a hollow head 17 of generally cylindrical shape which may be fixed in position upon the shaft by a set screw 18. Within the cylindrical cavity in the head there is mounted a sheet metal lining member 20 from which lips are struck up to grip opposite ends of an inclined mirror 21. At the forward end of the head and extending beyond it peripherally there is an annular sheet metal plate 22 secured in place by screws 8. The central opening of the plate is of approximately the same diameter as the internal diameter of the head. An integral lip 23 struck out from this plate is provided with a constriction which receives a loop on the inner end of a tension spring 24, the outer end of which is secured by suitable means to a side member of the frame. The function of this spring is toreturn the head and shaft to the illustrated angular position after each actuation of the handle 16. Hence the mirror 21 also stands in the illustrated position at all times except when the shaft 15 and head 17 are in motion. At the bottom of the head when it is stationary there is an opening 25 directly underneath the mirror. Movement of the shaft and head axially is prevented by the engagement of the head with the inner race of one of the bearings 14 and by engagement of a collar 9 with the inner race of the other bearing. The head 17 has a minimum diameter portion 26 and an intermediate diameter portion 27. Both of these portions are cylindrical.

There is also a third portion 28 which may be of slightly greater diameter than the portion 27.

This third portion, which is at the forward end of the head, is provided on its upper side with two spaced-apart flats 30 projecting outwardly beyond the surface 28. In the present instance each of these flats extends through an angle of approximately 360 and the space between them also oc5 cupies 360. A ring 31 loosely surrounds this forward portion of the head and is supported thereby.

After it is placed in position during assembly a collar 32 is pressed onto the portion 27 of the head.

Clearance is provided between plate 22 and collar 0 32 on the one hand and ring 31 on the other, so that the former elements merely guide the ring in its rotational movements without presenting undue friction.

5 Ring 31 is divided into a predetermined number of equal sections, 10 in the illustrated case, and each of these sections has parallel inner and outer flat surfaces. The inner flats cooperate with the flats 30 on the head so that when Sthe head is rotated a rotational impulse is imparted to the ring which, because of its greater inner dimension, is free to revolve relative to the head.

Suitable means is provided for constituting each of the sections of ring 30 an image forming section. In the illustrated embodiment of the 2,4 invention the images are formed by the transmission of light through the sections, although it will be apparent that by suitable changes in the congruction the images could be formed by the reflection of light from the section surfaces. In the present case the images are the ten digits from 0 to 9 inclusive, and as a convenient means for displaying these digits I may bore holes of the proper number through each section, indicated at 35 in the drawing. The digit 0 may be formed by a relatively large hole 36. These holes are projected on the screen as bright dots. Their arrangement in the ring may be as indicated in Fig. 6, or otherwise.

38 is a small projection bulb of the type commonly employed in photographic slide projectors. Current may be supplied from a :service line through a conductor 39 by way of a switch 40 controlled by lever 41, from the switch by way of a conductor 42 to the center contact on the bulb, returning by way of the outer bulb contact and the bulb socket to a terminal 43 and then through a conductor 44 back to the line.

A pair of condenser lenses 45, 46 are mounted in the framework between the bulb 38 and the forward part 28 of the head so that a beam of light may be transmitted from the bulb through the lowermost section of ring 31 and through the operming 25 in the head. The mirror 21 then deflects the beam through a pair of projection 3 lenses 47 and 48 mounted in a tube 49 which is adjustably carried in a larger tube 50 that is nounted in and extends through the casing 12.

While in most cases the ring 31 will be brought to correct position for projection of the image 3 by reason of its tending to settle into contact wilth the two flats 30 on the head, I prefer to provide means for definitely insuring proper alignment of the ring relative to the light system.

In the embodiment illustrated I provide me- 4 chanical means for this purpose. It comprises a metal bar 52 of appreciable weight having a flat undersurface biased downward by gravity to engage the uppermost external flat on the ring and insure the latter coming to rest with its lower- 4; most section in the direct path of the light beam.

For this purpose the ends of bar 52 may be of lessened height as shown in Fig. 3 and may be provided with holes in which supporting bolts 53 are loosely received. Nuts 54 serve to adjust 60 the height of the bolt heads. The nuts 54 bear against the upper sides of frame members which are provided with holes for the bolts.

When the head is rotated, causing the ring 31 torevolve, the bar 52 will vibrate up and down 65 as the ring revolves beneath it. The bar therefore acts as a brake as well as a means for bringing:the ring to rest with its lower section in centered position.

The light system need not necessarily be disposed as shown in the drawing. In a case, for example, where the condenser lenses are mounted in alignment with the projection lenses the mirror dan be omitted and the light beam can-be projected laterally through a ring section, the (5 image fbrming portion of each section then extending sidewise of the ring rather 'than radially thereof. It will be appreciated also that more than one ring may-be employed, each :ring moving independently of the other, when it is desfred to project numbers made up of ,more than one digit.

In :the operation of the device-the handle 16 may, be :given one or more complete turns,. or meiely.a :portion of a turn. As soon as it Is re57,280 4 leased by the operator shaft 15 under the influence of spring 24 will return quickly to its illustrated position. The ring will have received a rotational impulse which will carry it around for an appreciable time after the head returns to its initial position, the extent of movement of the ring depending largely upon the initial force applied to handle 16. The mirror 21 of course turns with the head 17, but as soon :as the latter comes to rest the-light 'beam is refleed by the mirror through the projection lenses. The beam is interrupted of course so long as the ring revolves. When it comes to rest the image forming portion of the lowermost section comes into proper alignment under the biasing influence of bar 52 and the image is projected. The oscillating movement of the head in coming to rest assists the action of bar 52 in properly centering the ring.

The ring 31 and the head 17 should be made of steel. They should be accurately shaped, as by broaching, and they should be heat treated to a hardness that will minimize friction and wear.

SHaving thus described my invention, I claim: 1. In apparatus of the character described, a horizontal shaft having a head, means for rotating said shaft and returning it to a predetermined angular position, said head having a flat portion 0 adjacent its normally upper side, a ring loose upon said head, said ring having a series of image forming sections, each of which has an internal and an external flat, each of said internal flats being adapted to engage the flat portion I of said head, means for causing a beam of light to impinge upon a section occupying a predetermined angular position, and for projecting said beam, and a yieldable member biased "toward said ring having a flat surface adsfted 'to 0 ride against the ring as the latter revolves and. by engagement with an external flat -to center a ring section with respect to said light 'beam when the ring comes to rest.

2. In apparatus'of the character described, a :horizontal shaft having a head, means for rotating said shaft and returning it to a- predetermined angular position, a ring loose upon said head, said ring having a series of image formtrig sections, each of which has an internal and an Sexternal flat, a pair of spaced flats on the side of said head which is uppermost when the head is at rest adapted to engage 'spaced internal flats on said 'ring, means for projecting a beanm-of light through a ring section occupying a predetermined angular position, and a yieldable member disposed above the uppermost section of the ring having a flat surface adapted to ride overthe ring as the latter revolves and by engagenmerit with the external flat on the uppermost sedtion of the ring to center a section with respect to said light beam.

3. In apparatus of the character described..a horizontal shaft having a hollow head of ;encrally cylindrical form, a ring surrounding and loosely supported on said head, means for rotating said shaft and returning it to a predetermined angular position, the supporting surface on said head imparting a rotational impulse to said ring when the head is rotated, means for automatically stopping said ring in any one of a plurality of predetermined angular positions, said ring having an image forming section corresponding to each of said .positions, said cylindrical head having an opening through its side which is lowermost when the head is stationary., said head containing an inclined mirror, means for projecting a beam of light upwardly through one of-sid image forming sections, through said opening and against said mirror, and projecting means including a projection lens through which the beam of light is directed by said mirror.


REFERENCES CITED The following references are of record in the iie of this patent: Number 1,584,531 1,695,683 5 1,857,902 2,077.369 2,106.128 2,108,844 2,138,821 2,221,063 2,233,134 Name Date Hagan ------------ May 11, 1926 Culp ------------- Dec. 18. 1928 Weber ------------ May 10, 1932 Karp ------------- Apr. 13, 1937 Stitt .------. J-n. 18. 1933 Brady ------------- Feb. 22. 1938 Potter ------------- Dec. 6, 1938 Teague et al. -_--- Nov. 12. 1940 Kessler ------------ Feb. 25, 1941