US144383A - Improvement in saw-sharpening machines - Google Patents

Description

T. M. CHAPMAN. Saw-Sharpening Machines.`

NO. 144,383. Y Patented No`v.1l, 1873.

` saw does not interfere with the clamp.

UNITED STATES 'PATENT OFFIOH THOMAs M. CHAPMAN, OF OLD TOWN, MAINE.

IMPROVEMENT IN SAW-SHARPENING MACHINES.

Specification forming part of Lettexs Patent No. 144,383, dated Ntvember ll, 1873; application led June 6, i873. l

To all whom it 'may concern:

Be it known that 1, THOMAS M. CHAPMAN, of Old Town, in the county of Penobscot and State of Maine, have invented certain new and useful Improvements in Saw-Clamps; and I do hereby declare that the following is a full, clear, and exact description thereof, that will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings and to the letters of reference marked thereon, which form a part of this specification, in which- Figure l shows a side view, and Fig. 2 a front eleva-tion, of my invention.

Same letters show like parts.

Myinvention consists of a clamp for hold ing saws While being led, and also of certain devices for feeding the saw to the le Without unclampin g it. It is capable of holding saws of all descriptions, and possesses many advantages over ordinary clamps,which are inconvenient in many respects, having to be loosened each time the saw is moved forward, and being but poorly adapted to holding saws having projecting collars.

Referring to the drawing, a shows a base or platform, to which is attached a standard, b, of convenient height, the upper portion of which forms one side or jaw, c, of the clamp. To this standard, at one side of and rising above the jaw o, is a projection or horn, d, having a hole therein, through which passes one end of an arm, e, so constructed as to turn in said horn in a vertical plane, and also having a longitudinal motion therein. To the other end of this arm, which is curved downward, is attached the movable jaw f of the clamp. The manner of attachment of the arm e to the horn d enables the jaw f to be swung vertically up when a saw is to be inserted in the clamp. This takes it entirely out of the way. The saw being placed in position, it is swung downward, holding it from the top instead of from the bottom or center, in consequence of which the collar (if any) upon the The jaw f is set up to the jaw c by means of a thumb-screw, y, upon the end of the arm c,

projection, which engages and holds it when y raised or clamped.

The construction and operation of the vertically-swin ging jaw will be understood by referring to the drawing. In Fig. l it is shown i raised, preparatory to inserting the saw, while Fig. 2 shows it down, as when the saw is clamped.

In order to enable the saw to be fed forward to present successive teeth to the action of the file, I provide both jaws c and f with rollers, between which the saw is held. The rollers h h in the stationary jaw c are revolved when required by appropriate machinery giving motion to the saw, while the rollers t' i' t' in the movable jaw f serve to lessen the friction.

I will explain the method by which I propose to give revolution to the rolls h. I extend their shafts downward through the standard b to a bearing, w, and attach to their ends gears j 7c. Between and meshing into them I place a third gear, l, upon an upright shaft, m, which shaft has also upon it a bevelgear, n, meshing into a second bevel-gear upon a horizontal shaft, p. Upon the other end of this shaft p is a treadle, q, moving loosely thereon, but actuating the shaft p in one direction by means of a pawl, r, meshing into a ratchet, s, upon said shaft. When the saw is to be fed forward the treadle is operated, transmitting the motion through the intermediate gears and shafting to the rolls h h, which feed the saw forward, as required.

The standard b and all its attachments are constructed so as to turn upon a vertical pivot, as common. gears n o permits this to be done without interfering with their operation, the gear o turning around the gear a as the standard moves. A clamp, is provided, adjustable perpendicularly in a slot, t, of the standard b, enabling the saw or saw-rest to be secured at different heights on the standard. It also affords an The arrangement of the beveladjustable center, upon which circular saws with their shafts and gears Zn and shaftm,

bevel-gear, and shaft p, connecting them With the loose treadle q,whereby motion is transmitted to said rollers, al1 arranged as herein set forth, for the purposes described.

3. The combination ofthe feeding devices with the swiveling standard, as desoribed.

In testimony that I claim the foregoing I have hereunto set my hand this 3d day of June, 1873.

THOMAS M. CHAPMAN. Witnesses:

J. B. BASS,

WM. FRANKLIN SEAVEY.

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