US1747315A - Shading machine - Google Patents

Description

IIIIII um@ Feb. 1s, 1930. w MURPHY 1,747,315

SHADING MA CHINE Filed June 26. 1928 Patented Feb. 18, 1930 UNITED STATES PATENT ori-ICE WILLIAM MURPHY, OF BUFFALO, NEW YORK, ASSIGNOR TO RICHARD E. GAVIN, OF BUFFALO, NEW YORK SHADING MACHINE Application filed June 26,

This invention relates generally to portable shading machines but more particularly to the means for mounting the shading screen or medium thereon.

Its object is to provide a simple, reliable and inexpensive holder or clamping device for detachably connecting the frame or carrer of the shading medium to the machine, such means being constructed and arranged to firmly secure the frame thereto and permit` of its ready application and removal in a minimum period of time.

In the accompanying drawings zp Figure 1 is a perspective view of a shading machine showing my improved holder` applied thereto. Figure 2 is an enlarged sectional top plan view of the holder and its associated parts. Figures 3, 4 and 5 are transverse sections on the correspondingly numbered lines in Figure 2.

Similar characters of reference indicate corresponding parts throughout the several views.

By way of example, my invention has been shown in connection with a shading machine including a base 1() supported on a board 11 and adjustable to any desired height relative thereto by the upright corner posts 12. Adjustably mounted on the base for bot-h lateral and longitudinal movement relative thereto is a sliding plate 13 to the front end of which is joined the improved holder or clamping device, indicated generally by the numeral 14.

This holder is preferably composed of a bottom plate or fixed jaw member 15 and a top plate 16, the front portion of the latter overhanging the former in the manner shown in Figures 3, 4 and 5 and its rear portion being secured to the bottom plate b v screws 17, which engage centering bosses 18 projecting downwardly from the top plate and seated in corresponding sockets 19 in said bottom plate. At its front andY adjoining sides the top plate has a depending rim or flange 20. The

holder is hinged to swing vertically relatively to the sliding plate 13 of the machine and for this purpose the ends of its bottom plate 15 terminate in rearwardly-facing hinge lugs 21 carrying pivot pins 22 detachably engaging horizontally-swinging levers 23 pivoted -tom of said frame.

1928. Serial No. 288,522.

at 24 to said sliding plate and joined to each other by a coil spring 25 which tends constantly to urge the levers into engagement with the hinge pins 22. By swingingthese levers outwardly, the holder may be readily detached from the machine. The front wall of the bottom plate 15 of the holder is provided adjacent its ends with bearing faces 26 against which the back edge of the film or screen-carrying frame 27 is adapted to bear, the screenor other shading medium 26 being glued or otherwise secured to the bot- Cooperating withthe fixed jaw member 15 for securely holding thefilm-frame to the holder is an opposing movable jaw 29 disposed centrally of the holder and adjustable transversely thereof toward and from the fixed jaw member. Said movable jaw is substantially T-shaped and is arranged beneath the overhanging portion of the fixed jaw, its shank or rear portion 30 engaging a guide way 31 arranged between the contiguous top and bottom faces of the holder- plates 16 and 15, respectively, and preferably formed by a recess or groove cut in the top face of the bottom plate. The head or front portion of the movable jaw engages a similar guide way 32 formed in the rim 2O of the top plate 16 and is provided at its front end with a depending gripping flange 33 for engaging the front edge of the attaching end of the screenframe, as shown in Figures 1 and 4.

The shank 30 of the movable jaw terminates at its rear end in a depending lug 34 in which an adjusting screw 35 is mounted, its front end bearing against the rear face of the holder-plate 15, as seen in Figure 4. Coil springs 36 are interposed between the fixed jaw plate and the head of the movable jaw for urging the latter forwardly or away from the fined aw to permit of the insertion and removal of the screen-frame to and from the holder. Upon turning the adjusting screw in a counter-clockwise direction the movable jaw is positively shifted rearwardly to grip the screen-frame, and upon turning the same in a clockwise direction the jaw is shifted forwardly by the springs 36 to release its grip on the frame.

By this construction and arrangement of parts.y the screen-frame is reliably and firmly held in the holder through the medium of a three-point bearing, including the fixed jaw bearing faces 26 and the gripping flange 33 of the movable jaw 29. Furthermore, the tightening and loosening of the frame to effect its application and removal to and kfrom the holder is accomplished by a fractional turn of the adjusting screw 35.

I claim as my invention 1. A holder for the shading medium frames of shading machines, comprising axed jaw member having an overhanging front portion for receiving the rear edge and adjoining top side of the attaching end of the frame, a movable jaw slidably mounted on the fixed jaw and extending beneath its overhanging portion, the front end of -said movable jaw terminating in a depending gripping flange arranged to engage the opposing front edge of said frame and its rear end terminating beyond said fixed jaw member and having a lug thereon, and an adjusting screw carried i by said lug and engaging the rear side of the fixed jaw member.

2. A holder for the shading medium frames of shading machines, comprising a fixed jaw member having an overhanging front portion for receiving the rear edge and adjoining top side of the attaching end of the frame, said jaw member having a guide way therein below the plane of its overhanging portion, an opposing jaw slidable in said guide way and terminating at its front end in a depending gripping flange arranged to engage the opposing front edge of said frames and at its rear end beyond the fixed jaw member in a lug, an adjusting screw carried by said lug and engaging the rear side of said fixed jaw member, and a spring interposed between the latter and said movable jaw.

3. A holder for the shading medium frames of shading machines, comprising a plate adapted to be hingedly connected to the machine and including bearing faces for the rear edge and adjoining top side of the attaching end of the shading medium frame,

a movable jaw slidably mounted substantially centrally of said plate and having a depending gripping flange in opposed relation to the rear edge bearing face of said plate and arranged to engage the front edge of said frame, an actuating screw for positively shifting the movable jaw to gripping position, and a spring for urging the latter to its released position.

WILLIAM MURPHY.

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