US1228685A

US1228685A - Projecting apparatus.

Info

Publication number: US1228685A
Application number: US7723416A
Authority: US
Inventors: Hug Bennett Magowan
Original assignee: Individual
Current assignee: Individual
Priority date: 1916-02-09
Filing date: 1916-02-09
Publication date: 1917-06-05
Anticipated expiration: 1934-06-05

Description

H. B. MAGOWAN.

PROJECTING'APPARATUS.

APPLICATION mso FEB-9, I916.-

LQQQfiEE-W I PatentedJune 5,1917.

ATTORNEY PROJECTING ,u an raneowan, or wnrrnnenrnnro, canine.

are arcs;

To all whom it may concern:

Be it known that 1, HUGE B. 'MAoowAN, a subject of the King of England, residing at Whitby, in the Province of Ontario, Dominion of Canada, have invented certain new and useful'lmprovements in Projecting Apparatus, of which the following is a specification.

An object of my projecting apparatus which is soarranged that light is assed' through a mask which is mounted to e capable of movement in its relative proximity with respect to the source of light, together with a clockwork or other operating means by which the mask is moved, the parts bemg so arranged that as the mask is moved and the relative proximity of the same-- with respect to light is varied, the image cast through the the source of mask upon a screen or other surface will be caused to increase and decrease in s1ze lIlversely with the movement of the mask away be connected in from and toward the source of light.

A further object is to provide means to the circuit when an electric lamp is used as the source of light, and which means is so constructed and arranged that durin movement of the mask in one direction, t e light will be extinguished.

A still further object lies in the provision of operating means which will propel the mask in one direction of movement only and when the limit of that movement-has been reached, will release the mask to permit the same to be instantaneously returned under spring action.

With the above and other objects in view,

' my invention consists in certain novel fea-..

maticallyindicated.

tures of construction and combinations of parts which will hereinafter In the drawings: c

Figure 1 is a view in longitudinal vertical section of a device constructed after my ine vention with the lines of projection sche- Fig. 2 illustrates an elevational and sectioraalview of a form of mask which may be use Fig. 3 shows a modified form of the light I projection aparatus. p

Fig. 44 is a eaentary detail view of one form of switch which might be used to control the light circuit.

- specification of Letters Eatent.

Applicafion filed February 9, 1916. Serial No. 77,23d.

in %n the present invention is to provide a i of this tube 7 and secured in the be set forth in connection with the accompanying drawings and then more specifically pointed out in the claims. s

Patented June 5,191'7.

view showing a dia- Fig. 5 is a detail light project phragm to vary the size of the opening. a

disclosure I have illustrated the main casing l and the screen 2 as being independent members, although it will be understood that under some circumstances of use it may be found desirable to construct the main casing in such a manner that the screen may be placed over the forward end thereof.

As is here shown, the case 1 comprises a rectangular receptacle which hasthe opening E, provided at one end near the top thereof. A lamp carrying tube 4 is stationarily mounted w1th the opposite end of the casing 1 in line with the opening 3, and an electric lamp bulb 5 is mounted at the outer end of this lamp supporting tube l, the reflector 6 being provided around this bulb to concentrate and project the rays of light therefrom in such a direction that they will shine out through the opening 3.

A sleeve or tube 7 is disposed around the light supporting tube 4 to 'be capable of endwise' sliding movement preferable that a pin 8 be passed through the slot 9 formed longitudinally at one side light supporting tube 4 to hold the tube 7 against turning movemen mounted around the inner end of the light supporting tube 4. to bear against the rear wall of the casing 1 and againstvthe rear end of the extension tube 7 so that this tube will normally be held in'the extended relation as indicated by the dotted lines of Fig. 1.

The forward endof the tube 7 is adapted to receive and hold a mask 11, the construction of which is better shown in Fig. Q. As is illustrated in Fig. 2, the body of the mask comprises an opa no disk which has the cut out opening 12 ormed in outline of the image to be projected, and if desired, a transparent film 13 may be disposed in the cut out portion 12 of the mask 11, this making it possible to project the image in colors or to show lining or printing as the rays are projected through the mask and are caught by the screen 2. Under some circumstances, it may be found desirable to make the entire mask a transparency and paint, print, or otherwise place subject matter thereon which is to be pro'ected, and under such cirlcumstances it, will of course be understood thereon and it is A. coil spring 10 is that any portions which are, not-to have the light penetrated therethrough will be paint.-

' red or otherwise coated with an opaque covering. To concentrate the rays cast by the lamp bulb and cause the same to be cast a with greater intensity through the mask, it may be found desirable'to provide a lens 14 in the forward end of the light supporting tube 4 after the manner illustrated in Fig. 3, and under some circumstances it may also be found advisableto provide a dia phragm or shutter of the type illustrated V in Fig;. '5,' or of any other approved form such as is used in a photographic camera, it however being understood that the lens and diaphragm are not essential to the successful operation of the device, but are only mechanical refinements which mightberesorted to.- I 7 g As is stated, the spring 10 will act to normally hold the tube? extended to theiposition indicated bythe dotted linesin Big;

,1, and in this relation of the parts, the image will be'projected through to be thrown upon the screen 2 in the size indicated by the dotted lines ate-a. As the tube 7 is I moved inwardly over the light supporting tube 4: against the tension of the spring 10, the mask 11 will'be brought into'closer proximity to the light bulb 5 and in consequence the rays of light will be cast therethrough ata wider angle and the image as caughtby the screen 2 will be correspondingly enlarged. It is desirable that some form of means be provided to cause this movement of the tube 7 to thus cause variance of the size of the image cast upon the screen2,

and to this end, I provide a rack bar 16 on the lower side of the tube 7, and an interrupted gear wheel 17 being mounted in the casing to receive its turning movement from the motor 18. The gear 17 meshes with the teeth of the rack '16 and as this gear is turned in the direction indicatedbythe arrow, the extension tube 7 will be carried into the casing 1 against the tension of the spring 10 and in consequence, the image cast upon the screen will be gradually increased as the angle at, which the rays are projected through the mask is widened. It is preferablev that thegear wheel 17 be arranged as an interrupted gear,that is that the teeth be omitted on one side so that'as the extension tube 7 has been carried inwardly to the proper extent, thi sinterrupted portion of the gear wheel 17 will be brought into line j wlth the teeth of the rack 16 and thus the.

' extension tube 7. is free to return to its extending position under the tension of the spring 10 to be again returned gradually.

inwardly by the engagement of the teeth of the gear wheel 17 as the rotation is continued. I

Under some circumstances, it may be found desirable to arrange means wherebyable lam 5 Leas es the lightwill be'cut out of itscircuit while the extension tube 7 is moving to the extended position and to cause the light to be I I glowed only while the tube 7 is being carried'on its inward travel, and inFig. 4 I

have shown a means by which this result can be accomplished As here shown, the

shaft 19 by which the gear wheel 17 is carri ed has a cam wheel 20' mounted to turn thereon and'provided with the notch 21 at a point registering with the point atwhlch theteeth of thegear 17 will be carried out videdto normally hold the slide rod 26' extendedTfrom the bearing tube 25 and in engagement with the rim of the cam wheel 20. As theishaft 19 is turned and the cam wheel 20 is given consequent movement, the slide rod 26 will be normally pressed into the bearing tube 25 against the tension of the spring 28 and the bridge piece 27 will be in a position to establish an electrical connection between the contact connected with the

lam circuit wires

22 and 23 and then,

this bridgepiece 27 will be removed from the position of engagement with the contact I and in consequence the lamp circuit will be broken,

As is stated, the screen 2 may be formed as a part of themaincasing 1, and under these circumstances, the screen would be a transparency, as for instance ground glass,

which would cast the image and permit the as the s ide rod 26 passes into the notch 21, a

same to be viewed from the exterior. Where the screen 2 is to be used for day-light pro-' jections, .it-may be founddes'irable to pro- I d I vide the shades 29 around the, side edges thereof and this same expedient might be resorted to where the screen is either of a semi-transparent nature or is of the reflecting type.

In the present disclosure, I have shown the circuit connection to the lamp bulb 5 and to themotor 18 as deriving energy from the same source, although, it will of course be understood that these circuit connections might be carried inanyzpar'ticular use of the device. 1 While the source of light has been illustrated as an electric bulb, this might be varied and a gas, oil, or other suitpjroject its rays provided to through t e mask carried 31 the extension tube 7, and also for the, motor 18, there might be substituted a clockwork mechanism which would cause the ge'ar wheel 17 to be 'ven the proper turnin movement.

While I have herein s own and'described 130 the extension tube 7 is given its outward movement and the means by which thesame is moved inwardly might be varied, that the mask might be given any number of varied forms, that printed matter and other designs might be shown on the mask to adapt the device for use in advertising or by placing grotesque figures thereon, the device could be adapted as a toy for the amusement of children, and that other modifications and variations in the construction and arrangement of the parts can be resorted to without departing from the spirit and scope of my invention, and hence, I do not wlsh to be limited to the exact disclosure but only to such points'as may be set forth in the claims.

I claim 1. A source of light, a mask mounted to have the rays of light projected therethrough and arranged to be capable of movement in a straight line toward and away from said source of light to vary the width of the angle at which said rays are projected 'therethrough, and means to accomplish the desired movement of the mask,

2. A source of light, a mask mounted to have the rays of light projected therethrough and arranged to be movable in its relative disposition with respect to the source of light, means to accomplish movement of the mask, and means deriving operative movement from the mask moving means to extinguish the light at predetermined intervals.

3. In combination with a screen, a lamp arranged tocast rays of light upon the screen, a mask mounted between the lamp and the screen to be capable of relative movement in its proximity to the lamp on a line from the lamp to the screen, and'means to transmit movement to the mask to vary the proximity of the same to the lamp and to thus vary the angle at which the rays are east through the mask from the lamp to ing position and to permit return of the same under the action of said first means.

5. A projecting apparatus comprising a casing, a screen, a lamp mounted at a fixed point, a mask arranged to be capable of movement with respect to the lamp and to have the rays cast therethrough to be received on the screen, means to normally hold said mask in one of its extreme positions, means to move the mask to the remaining position and to permit return of the same under the action ofsaid first means, and

means to extinguish the light during the movement of the mask in one direction.

6. A projecting device comprising a casing, a screen, a light tube mounted at a fixed point in this casing, a lamp carried by said tube to project the rays upon the screen, an extension tube received around the light supporting tube, a-rack carried by said-extension tube, a spring to normally hold said tube in one of its extreme positions, and an interrupted gear to be given turning movement to cause the extension tube to be moved to the remaining extreme position through the mesh of the teeth thereof with the teeth of the rack, and means to cause the interrupted gear wheel to be turned.

7. A projecting device comprising a casing, a screen, alight tube mounted at a fixed point in said casing, a lamp carried by said tube to project the rays upon the screen, an extension tube received around the light supporting tube, a rack carried by said extension tube, a spring to normally hold said tube in one of its extreme positions, an interrupted gear-to be given turning movement to cause the extension tube to be moved to the remaining extreme position through the mesh of the teeth thereof with the teeth of the rack, means to cause the interrupted gear wheel to be turned, said parts being so arranged that as the teeth of the gear wheel pass from mesh with the teeth of the rack, the extension tube is permitted to return to the first extreme position under the tension of the spring, and means to extinguish the lamp as the tube is moving under the tenslon ofthe spring. 1

In testimony whereof I aflix my signature in presence of two witnesses.

' HUGH BENNETT MAGOWAN.

Witnesses FRANCIS MOCKERBY, J. FA'NNING.