US1392207A - Projection apparatus - Google Patents

Description

WMOU. PROJECTION APPARATUS. APPLICATION FILED AUG-II, I920- 1,s92,207. Pawhwd'sept 27,1921.-

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i I '1 Oooooooood v UNITED STATES] PATENT OFFICE.

HARVEY n. o'r'r, or'BurrALo, new Yonx, AssIeNoa'mo SPENCEBYLENS comrnmz,

- or BUFFALO, NEW YORK.

To all whom it may concern:

. Be it known that I, HARVEY N. O'r'r, a citizen of the United States, residing, at Buffalo, in the county of Erie and State of New York, have invented a new and useful Improvementin Projection A paratus, of whichthe following is a speci cation.

,This invention relates to projection apparatus of the lrindiadapted to project im-.

ages upon a suitable jfscreen, and more particularly to means for supporting apparatus of this type on a supporting surface, such as tables, boxes or chairs. I

Usually, apparatus of this type are portable, being carried from place to place whenever the pictures are to be exhibited and are set up on the most convenient object to be obtained for that purpose, usually a table,.box or chair. The dimensions of the upper or supporting surfaces of these.

objects are, of course, different and heretofore with an apparatus of this type con siderable difficulty has attended the proper placement of the apparatus whereb a stable mounting maybe attained. n some projectors the base of the lamp box is pro vided with supporting legs at its corners. The disadvantage attending this type of structure is that a supporting surface of as large area as the bottom of the lamp box is required. In other apparatus the lamp box isprovided with a supporting member or pair of legs and the projection objective focusing, the supporting legs are liable to be shoved over the edge of the supporting surface, thus permitting the apparatus to 'falland be damaged. Furthermore, with the apparatus commonly in use, quick and convenient adjustment as to the elevation of the axis of projection is not possible. I

l One object of the present invention is to provide desirable supporting means for the apparatus which may be plaredand Oper Specification of Letters Patent. Patented Sept, 27, 1 921. Application filed August 11, 1926. seria noL 402,85bi

s ted upon a relatively sinall'supporting sur ace.

Otherobjects are to permit full movement of the projection objective without requirmg any increase in the size of the supporting surface or without liability of moving the supporting; member for the objective .off of the supporting surface; also to provide an. apparatus wherein adjustments of elevation of the axis of projection may be made easily and quickly without disturbing the focus of the 'instrument; also to improve projection apparatus in, theother respects hereinafter described and set forth in the claims.

For the purpose of illustration, I have shown an embodiment of the invention as applied to a type of projection apparatus in which transparent slides or objects are used, but it will be understood that the invention is susceptible of use with other forms of projection apparatus. v

In the accompanying drawings Figure l is a side elevation of a projection apparatus embodying the invention.

Figs. 2, 3 and 4 are fragmentary side elevations thereof showing the adjustable sup-- porting members in different supporting positions. r I

Fig. 5' is a section thereof on line 5-5, Fig. 4. I j

Fig. 6 is a longitudinal vertical section on line 6-6, Fig. 5.

Referring to the drawings:

A designates the lamp box of a projection apparatus, B the slide orobject holder, C the projection objective and D the usual bellows.

The projection objective is movable toward and from the object holder, being'connected to an extensiblesupport, preferably comprising slide rods 10 secured to-the objective casing and which telescope into tubes 11 slidable in suitable guides 12 on the bottom of .the lamp box. 12 designates set screws for screwing the tubes 11 in different positions on the rods 10. 7

The apparatus is provided with a relatively fixed support, which in the embodiment illustrated assumes the form of a pair of legs 13, secured to the bottom of the lamp box, and with a movable and adjustable supporting member for the frontend of the apparatus adapted to cooperate with the legs13 to provide a firm and stable base for Y the apparatus, and which is a readily ador rea'rwardly inclinedposition to placetheir support is mounted for sliding] movement on the tubes 11, and as illustrated, comprises tube-encircling sleeves 14 connected by a horizontal spacing plate 15 and is provided.

with downwardly projecting side flanges 16. As shown, these flanges are formed on a separate plate 17 secured-to thespacing plate 15. A pair of connected supporting legs 18 are suitably pivoted at l9to the flanges 16 for angular movement relative to the plate. In order to secure the legs in the different angular positions the flanges are formed with arcuate slots 20 theret'hrough which receive the ends of abolt 21 passing through the legs 18 below their pivot points. One end of the bolt is provided with suitable means, such as a thumb screw 22 for securing the bolt in different positions in the slots.' As'illustrated in the drawings,' the adjustable supporting legs are of greater length than the fixed legs on the lamp box whereby, as shown in Fig. 4, the apparatus may be leveled on a sloping supporting surface such as a'school-room desk, or may be tilted to secure'a required inclination of the axis of projection. As illustrated in Figs. 1' and 3, the adjustable supportingmember may be moved on the tubes 11 longitudinally of the apparatus to adapt itself to supporting surfaces of'different area, without afiecting the focus of the apparatus. Since the front legs 18 are pivoted, they can be set in either an upright position or at different in clinations, thereby tilting the apparatus so as to elevatethe axis of projection as may be necessary, or to level the apparatus on a horizontal or sloping supporting surface. The legs can also be set in either a forwardly lower ends farther from or nearer to'the rear legs 13, to adapt the legs to different, supporting surfaces, either with or without changing the inclination of the'axisof'projection. This angular adjustment of the front legs supplemented by their sliding adjustment toward and'from-the rear legs makes possible a great variety or difierent relations of the legs, such as to enable the apparatus to be readily supported and properly adjusted on various, different sorts of supporting surfaces. It the 'front'legs are set so as to tilt the apparatus, the inclinationof the axis of'projection canbe readily altered somewhat, simply by sliding the front legs forwardly or rearwardly, thus enabling a very accurate adjustment of the elevation of the axis of projectionf' This is illustrated by the full and broken line posi-' tions shown in Fig; 3. 'rin adjustment wherein a most stable support is effected is illustrated in F 2, where the adjustable legs are moved forwardly I a considerable. distance from the rear legsand" secured 1n 1. In projection apparatus, the combina tion .with a lamp box and a projection ob-' jective movable toward and from said lam boxfor focusing, of an angularly adjustable supportfor the front end of the apparatus, said support being longitudinally movable relatively to said lamp box and said objective, whereby the apparatus'may be adjustedto regulate theelevation of the pro-' jection and longitudinal movement of-the objective relatively to the apparatus may be effected without novingsaidadjustable support. p V

In projection apparatus, the combinationwith alamp box, a projectionobjective, and an extensible member connecting said lamp boxhand said objective whereby said said lamp box, of an angular-1y adjustable supporting member for the apparatus mounted for sliding longitudinal adjustment on and relatively to SZUCl extensible member.

3. In projection apparatus, the combination with a lamp box, aproje'ct-ion objective, and an extensible member connecting said lamp box an l said objective whereby said objective may be moved toward and from said lamp box, of an angularly adjustable support forjthe objective end of the apparatus, said support being movable With and said extensible member.

relatively to and adjustable relatively to i. In projection apparatus, the combina tion with a lamp box, a projection objective, and extensible members connecting said projection objective and said lamp box, of'a supportfor one end of the apparatus, said support comprising sleeves surrounding said extensible members and supporting legs angularly adjustable relatively thereto.

In projection apparatus, the combination with a lamp box, a projection objective and extensible members connecting said pro jection objective and said lamp box, of a support for one end of the apparatus, said support comprising a partmounted for slid-v ing movement on said extensible members, a downwardlyprojectingflange on said'slid.

ing part and a supporting'leg, pivoted to said flange. i" j,

6. In projection apparatus','thecombina tion with lamp box, a projection objective, and extensible members connecting said, objective and said lamp box, of asupport for objective may be movedtoward and from one end of said apparatus, said support comprising a part mounted for sliding movement on said extensible members, downwardly projecting flanges on said sliding part, supporting legs pivoted to said flanges and movable angularly relatively to said extensible members, and means for releasably holding said legs in difierent angular positions relatively to said extensible-members.

7 In projection apparatus, the combination with a lamp box, a projection objective, and extensible members connecting said projection apparatus and said lamp box, of a support for one end of said apparatus, said support comprising. a part mounted for sliding movement on said extensible' members, said part having downwardly projecting side flanges formed with arcuate slots therethrough, a pair of legs pivoted to said flanges for angular movement relative to said extensible members, a bolt extending through said legs and through the slots in said flanges, and means cooperating with said bolt and slotted flanges for securing said legs in different angular positions relatively to said extensible members.

8. In projection apparatus, the combination with a lamp box and a projection objective movable toward and from said lamp box for focusing, of a relatively fixed supporting rest for one end of the apparatus, and an angularly adjustable supportfor the other end of the apparatus, said support being longitudinally movable relatively to said lamp box and said objective, whereby the apparatus may be adjusted to regulate the elevation of the projection and longitudinal movement of the objective relatively to J adjustable support mounted on said extensible member, said support being longitudinally movable with said extensible membeirelatively to said lamp box and longi-- tudinally movable relatively to said extensible member and said projection objective. V

1.0. In projection apparatus, the. combination with a'lamp box, and a projection objective movable toward and from said lamp box for focusing, of a pair of relatively horizontal tubes slidably connected to said lamp box and movable to project more or less therefrom, a pair of slide rods telescoping with said tubes and connected at one end to said projection objective, and an adjustable supporting member slidably mounted on said tubes whereby said supporting member may be moved longitudinally of said apparatus with or relatively to said projection objective and with or relatively to said tubes and said projection objective may be moved longitudinally relatively to said tubes and said support.

Witness my hand this 9th day of August,

HARVEY N. OTT. Witnesses:

LOUIS M.-POTTER,

ARTHUR A. HAHN.

the combina

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