US1353242A - Frame for moving-picture screens - Google Patents

Description

A. T. JACOBSSON.

FRAME vFOR MOVING PICTURE SCREENS.

.APPLICATION FILED APR. 17, 1920.

1,353,242. Patented Sept. 21,1920.

2 SHEETS-SHEET l.

A. T. JACOBSSON.

FRAME FOR MOVING PICTURE SCREENS.

APPLICATION FILED APR. 17, 1920- Patented Sept. 21,1920.

2 SHEET SSHEET 2.

ATTORNEY JUNIT I TAT AXEL macros anconssoiv, or CZEVELANlj, OH10.

1 T all whomz't may concern- RAME Fort 'MovmG-rrorURr. sonEE vs;

Application t April 17,

Be it known that I, AXEL THnoDoR J Ame SON, a subject of the Government of Sweden, residing at Cleveland, in 'the county of Cuyahoga and State of Ohio, haveinvented certain I new' and useful Improvements 1n Frames for Moving- Picture Screens, of which the following is a specification.

This invention relates to frames for. supporting fabric screens used in connection with moving picture machines and for the purpose of receiving the image projected therefrom.

It has for its particular object to provide a light but sturdily constructed framework, preferably made of wooden strips upon which the reproducing fabric is stretched.

Heretofore it has been difiicult to obtain a fabric surface which would be free from wrinkles, the common method being to provide an ordinary framework of wood and to tack the fabricabout the edges. Diffi-v culties attending this process are numerous and chief among them the impossibility of providing a surface entirely free 1 from wrinkles;

- By the means employed fabricis first tacked upon the edges ofthe main framework and this framework is then so manipulated as to permit of stretching the fabric even surface.

. With the above object in view the invention consists in'the certain arrangement and combination of parts hereinafter illustrated in the drawings, and described and particu- -larly' pointed out in the accompanying claims. 7

Reference being had to the accompanylng drawing wherein like reference numerals 1ndicate similar parts throughout the various views, Figurel is a perspectlve vlew of the device with a portion of the fabric-shown in place; Fig. 2 is a vertical section; Fig.

3 is a detail rear view of one of the joints; Fig. 4 is a perspective view, Fig. 5 is a perspective view showing the manner in which the corners are constructed, and Figs. 6, 7

. and 8 are detail views showing a modified form of. construction.

The invention comprises a ,frame composed of top and bottom members 1 and 2 and spaced from. each other at their ends by the side members 3. The. corners of these two members are in effect a miter joint but a tongue which engages grooves 5 cutin thev opposite members, thejoints being loose of the corners are formed in a like manner.

A supporting or inner framecomprising longitudinal vstrips (Sand transverse strips 7 1s secured to the back of the main frame and in a manner to permit of movement being had between the fabric supporting structure and itself. The strips 6 and 7 are rigid with respect to each other and at the points where they cross eachother the ordinary. mortise joint is employed, the separate pieces being secured to each other by means of screws 8 passing therethrough. The strips 6 and 7 are secured to the supporting structure by means of blocks 10 and said blocks are provided with transverse grooves 11 and 12 and said grooves'are cut ina'manner to'provide a tongue or bridge 12. The'ends of the strips 6 and 7 are provided with slots 14 thereby to straddle the bridges 12 when in place'and the aforesaid grooves are large enough to permit of mm siderable play being had between the block 10 and the strips 6 and 7,

In this manner after the fabric has been stretchedover the strips 1, 2 and 3 and se-" 5 strips with sufficient pressure,'to warp the vstrips l, 2 and 3 to an extent sufficient to perfectly smooth out all wrinkles in the fab- "In Figs. 6 to 8 I have shown a modified? form of structure comprising a frame 20 composed of top' and bottom strips 21 and 22 respectively, these are joined] at their endsby a mortised joint 24= and are adapted v to carry the fabric upon which the image I is projected from the moving picture machine. The aforesaid, frame is braced at.

eachof its corners by a structure which permits the frame being manipulated as in the formerly described: means.

' This consists 1n securing to'each of the ing similar to that heretofore described for in one direction. It will be noted that each I Mconstruetion hiclrwill: be cheap of manu- A edges at 29, the. frame, may beW grees and a brace-2&5having itsends formed similar to the strips v6\ and 7. is then inter..-

locked with said blocks, and by driving shape as previously" described.

. The above described-construction;provides. .1

ameans for accomplishing the results above set ff'ortli- 1n aiqulclfi and efiicl'ent manner, a

feature, extremely durable and; light in 'Weight and. While; Ir'haue shown and" described this; particular form ofi invention 7 it, is: evident, that thesame is capable of being modified in various waystherefore I do not wish to limit myself in theconstruction Of; the: same furtherthan is required. by. the

arped into I state of the art or that which comes Within the scope of the appended claim.

A screencomprising an outer frame having bars with lbose joints in the corners of the frame; a fabric fixed to said bar s.,,,blocks fixed to all of said bars, aninnerfrigid fmamehaaingjerossed bars the ends of which are loosely mortised into said blocks, and wedges in the mortises, between saidf ends and the blocks,; to; expand. the. bars: of i the outer frame, a 1

11m testimony Whereofil' doafiix my 'signa'- ture in presence 'ofitwowitnessesu AXEL THEODQR' J ACOB SSON.

Witnesses: 7

"JOHN: BoMM'HARmi Gt. V.,RIOSENBERG; I

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