US135408A

US135408A - Improvement in buck-saw frames

Info

Publication number: US135408A
Authority: US
Publication date: 1873-02-04
Anticipated expiration: 1890-02-04

Description

W. CLEMSON.

Buck Saw-Frames.

No. 135,408x Patented Feb.4,1873.

AM H1010 1mm GRAPHIC ca n1 ('OSBamva'? PRaaEss) UNITED STATES PATENT OFFICE.

WILLIAM CLEMSON, OF MIDDLETOWN, NEW YORK.

IMPROVEMENT IN BUCK-SAW FRAMES.

Specification forming part of Letters Patent No. 135,408, dated February 4, 1873.

To all whom it may concern.-

Be it known that I, WILLIAM GLEMsoN, of Middletown, in the county of Orange, in the State of New York, have made certain Improvements in Buck-Saw Frames, of which the following is a specification:

The object of this invention is to improve the saw-frame patented to me October 10, 1871, in which patent wood-screws are used to truss and strengthen the frame and hold the parts of the frame rigidly together; while in this improvement the brace is simply a metal rod in square form in cross-section and twisted.

In the drawing, Figure 1 represents a side view of the saw-frame, and Fig. 2 is an enlarged broken sectional View.

A A represent the end pieces of the frame; A, the stretcher-bar; a, the strain screw-rod with screw-nut; B, the saw; and O,the trusstwisted metal braces that pass through holes a in the end pieces of the frame, and into holes a in the stretcher-bar A. Theholes a in the end pieces A and a in stretcher-bar A are of the size of the diameter of the square bar or rod before being twisted, and when bored, as represented in Fig. 2, are ready to receive the braces G, which are made from square rods of metal twisted, as seen, out to the proper lengths, then driven through the end pieces A into the stretcher-bar A, and as they are so driven, the angles of the twisted rod cut into and take hold of the wood outside of the holes a and a in a spiral direction as they are driven through, causing the brace O to turn spirally like a screw, and when driven home to its position cannot be withdrawn from the holes without tearing the wood, thus making the frame as compact and strong as the wood-screws heretofore used,

and very much cheaper, for in boringfor woodscrews two sizes of boring-bits have to be used to bore the holes, one large enough to receive the body of the screw, and the other for the screw part take hold of in turning into the wood, and then the' twisted square rod costs less than the screw, and when so made the frame is as rigid and compact as when the screws are used, as the twisted bars, when in position, act the same and produce the same result as the screws. Only one of the twisted braces 0 may be used, as seen in Fig. 2, when desired.

The great demand for buck-saw frames makes it necessary to construct them as cheap as possible and have the proper strength; and a saving of even a few cents in the cost of each frame makes a large sum in the aggregate where tens of thousands are made.

I am aware that straight braces of wire having end bearings in the end pieces of the frame and in the strain-brace have been used; and I am also aware that wooden braces for the same purpose have been used in the construction of buck-saw frames; neither of which do I claim, as I especially confine my improvementto the use of the twisted metal I braces as described in the foregoing specification.

Having thus described my invention, what I claim, and desire to secure by Letters Pat cut, is

The buck-saw frame abovedescribed, composed of end pieces A A, bar A, strain-rod a, and twisted brace or braces O, constructed and combined substantially as shown.

WM. CLEMSON.

Witnesses:

CHAS. J. HUM'PHREY, O. O. MADDIN.