US189831A - Improvement in clamps for making frames - Google Patents

Description

.1. ZIMMERMAN. v CLAMPS FOR MAKING FRAMES.

Patented April 17, 1877.

INVENTOR WITNESSES ATTORNEYS,

[LPETERS PHDTD-LITNDGMPHER, WASHINGION. D C

UNITED STATES PATENT Ormon.

JASPER. ZiLMMERMAN, OF BBUNS WIGK, MISSOURI...

, IMPROVEMENT IN CLAMPS FOR MAKING FRAMES.

Specification forming part of Letters Patent No. 189,831, dated April 1'7, 1877; application filed November 4, 1876.

To all whom it may concern:

Be it known that I, JASPER ZIMMERMAN, of Brunswick, in the county of Ghariton and State of Missouri, have invented a new and valuable Improvement in Clamps for Making Frames; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being bad to the annexed drawings,

.nnaking a part of this specification, and to the letters and figures of reference marked therewithout cutting away'an unnecessary amount of the material, said recesses (marked B B in the drawings) are made fishtail -shaped at each end, so that the thick parts a a of said arms terminate inwardly in points of. Arms A A are locked at any desired angle by means of a screw-tapped clamping-lever, O, which engages with screw-threads on the end of bolt a.

The thick parts a of arms A A are longitudinally slotted at A so as to allow the adjustment toward and from the pivot of four plates or disks, D, each of which is provided with a screw-threaded attaching-bolt,

' d, that passes down through one of said slots A. Each one of said plates is locked in any such adjustment by means of a screw-tapped clamping-lever, E, (similar to 0,) which operates on the screw-threads of its attachingbolt 01. Said bolts a and d are provided with washers c 0, against which the screw-tapped nut ends of saids clamping-levers bind. Said bolts d, when said clamping-levers are loosened, are capable of being turned within their slots. Said plates or disks D are provided with raised flanges or lugs F F, (two to each plate,) which flanges or lugs are screwtapped and receive radial thumb-screws G G, which press against the picture-frame or other frame held in said clamp, binding upon the same at each side of every corner thereof. Each one of said metal disks or plates D is provided with a circular wooden shield,

H, (shown in Fig. 2,) for the purpose of prewill be presented properly to the sides of the frame, which they hold on each side of the corners thereof.

The moldings for the frame are first sawed 0K in any miter-box, and then placed in the clamp, which will bring all the joints into position at the same time. If any do not fit, the ends of the moldings may be suitably sawed away by inserting and operating a fine saw without removing them from the clamp. When the joints all lit, the plates D are loosened so as to allow the removal of said moldings, the ends of which are then glued. The said moldings are next replaced in the clamp, as before, and the clamp. is tightened again to hold them for drying. When the drying is ended the frame is finished.

If the moldings are too thin for the thumbscrews G G to bear against them, thin strips of wood are placed on shields H, so as to hold up said moldings sufficiently to be clamped. Arms A A are graduated, as shown in Fig.

'2, so as to facilitate the hereinbefore-described adjustment for size. The diagonal of the frame being known, it is only necessary to adjust each of the disks or plates D onehalf of that distance by said graduation-s or screws G G, said disks being adapted to slide In testimony that I claim the above I have in their slots, and also to be rotated ontheir hereunto subscribed my name in the presenc axes, and held in any desired position, subof two witnesses. o stantially as described.

2. In a clamp for frames, plate D, provided JASPER ZIMMERMAN. with screw-tapped flanges F F, and clamping Witnesses: thumb-screws G G, arranged and operating R. O.GREGORy,

substantially as and for the purpose set forth. LoU. A. FISHER.

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