US498360A - Saw-clamp - Google Patents

Description

(No Model.)

M. 1). MINER.

, SAW CLAMP. No, 498,360. Patented May 30,1893.

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MARVEL DAYTON MINER, OF LEYDEN, MASSACHUSETTS.

SAWI-CLAM P.

SPECIFICATION formingpart of Letter Application filed May 14, 1892.

To all whom it may concern:

Be it known that I, MARVEL DAYTON MINER, a citizen of the United States, residing at Leyden, in the county of Franklin'and State of Massachusetts, have invented certain new and useful Improvements 'in Saw-Clamps; and

saw clamps and the objects of the invention are, first, to provide a clamp of simple construction which will hold the blade of the saw firmly and which can be readily reversed to enable the operator to work on both sides of the saw without removing the same from the clamp; and, secondly, to provide an improved file holder for such clamp, which file-holder can be easily moved longitudinally of the clamp and adjusted at any desired angle as the saw is being sharpened.

With these ends in view, my invention'consists, first of a series of three frames having their legs pivotally connected at their upper ends, the legs of the central or intermediate frame being of greater length than the legs of the outside frames, a series of parallel arms pivotally connected at an intermediate point of their length to both sides of the upper cross bar of the central frame and carrying, at'their upper ends, suitable clamping jaws for holding the saw, and a cam shaft journaled in the legs of the central frame and extending parallel to the upper cross bar of said frame between the parallel jaw-supporting arms.

My invention further consists in the combination with a saw clamp having longitudinal grooves or ways formed in the outer faces of its jaws, of an arm mounted, so as to rotate freely in all directions, of a support fitted in one of said ways or grooves, a sleeve carried by said arm, and an endwise movable rod passing through and supported by said sleeve, said rod being provided at one end with a suitable handle, and, at an intermediate point of its length, with adjustable means for supporting a file.

My invention further consists in the peculiar construction and arrangement of parts 5 Patent No. 498,360, dated May 30, 1893.

Serial No. 433,021. (No model.)

as will be hereinafter fully described and claimed.

In the accompanying drawings-Figure 1 is an end elevation of myimproved saw clamp; 5 5 and Fig. 2 is a vertical sectional View of the clamp with the file holding devices removed. Fig. 3 isa'sectional view on the line ocx of Fig. 1. Fig. 4 is a detail View.

Like letters of reference denote correspond- 6o ing parts in the several figures of the drawings, referring to which- A designates the central frame and B, B, the twoside frames forming the bodyof my ,improved clamp. The central frame A consists of two parallel legs Ct which are 'connected and braced by any desired number of cross bars a. The side frames B, B, are each composed of two parallel legs or supports 1) connected and braced by one or more cross pieces I); and the legs or supports b of said side frames are connected, at their upper ends, preferably by means of hinges O, to the legs a of the central frame A, so that when not in use said side frames can be folded against the central frame and the device can be stored in very small space. The side frames B, B, are connected and strengthened when separated or adjusted apart from the central frame by links 12*, b which'are connected to the legs. 19 of said frames on opposite sides of the-legs a of the central frame A. I The legs" a of the central frame A are slightly longer than the legs of the side frames B, B, so that when either one of said frames is extended or moved away from said central frame and the lower ends of the legs thereof rest on the ground or floor, the central frame will be inclined in the opposite direction from that of the legs I) of the extended side frame B as shown in the drawings.

A series of parallel levers or arms D are pivotally connected, at an intermediate point of their length, to the upper cross bar ct of the central frame A. Said levers D are arranged in pairs on opposite sides of the said cross bar and the upper ends of said levers are rigidly attached to the jaws E of the saw clamp.

In the legsa of the central frame A, below 'the upper cross bar 0. thereof, is journaled a transverse shaft F which extends parallel to the cross bar a between the pairs of levers D and is provided with a suitable handle or crank G for turning the same. This transverse shaft F is made elliptical or oval in cross section, as shown in Fig. 2, so that as it is turned to bring its longest diameter at right angles to thelength of the levers D the lower ends of said levers on opposite sides of the bar a, will be forced apart and the jaws E carried at the upper ends thereof will be forced closely together to tightly clamp or hold a saw which may be placed between them.

The jaws E of my improved clamp are provided in their outer faces with longitudinal grooves or ways 11 and to the faces of the jaws on opposite sides of said grooves are secured by screws, or other suitable fastening devices, longitudinal metallic plates 1, the inner edges of which project slightly over the grooves H.

A block or bed K is provided on its under or lower face with a projecting rib or flange 7.: which fits in the groove H in one of the jaws, and in said flange or rib 7e are formed parallel grooves which receive the inner edges of the plates I and prevent any lateral movement of the bed K. In the upper portion of the bed K is formed a socket L which receives a ball M attached to one end of an arm N. The ball M is held at any desired position within the socketL by means of a thumb or set screw 0 working in a threaded bearing in the side wall of said socket, and bearing at its inner end against the ball.

The outer free end of the arm N is bifurcated and in such bifurcated end is pivotally mounted a sleeve P. Through this sleeve P extends a rod Q, which is provided at one end with a handle R and at its other end with a removable enlarged head q. A longitudinal groove '1' is formed in the rod Q, and on said rod between the sleeve P and the handle R are arranged short sleeves S provided with depending arms 8 adapted to support a file T. The sleeves S are rigidly and firmly secured on the rod Q at any desired point by means of thumb or set screws U, which work through said sleeves and into the groove 0. Around the sleeve P is fitted another and shorter sleeve V and through this sleeve and the sleeve P works a thumb or set screw W, the inner end of which bears against a shoe which is fitted in the groove 1 in the rod Q. The

rod Q can be rotated within the sleeve P, and held in any desired position by the set screw W, to change the position of the file T and thus the file is adapted to cut teeth of different pitch;

The operation of my device may be briefly stated as follows:--The saw to be sharpened is inserted between the jaws E and the transverse shaft F is turned to bring its longest diameter at right angles to the length of the levers D and thus force the jaws E firmly against the blade of the saw. The arm N is turned in its bearing on the frame so as to bring the file into the proper position with relation to the saw blade, and said arm is held firmly in this position by the set screw 0. The rod Q is then reciprocated longitudinally and the file T carried thereby quickly sharpens the tooth of the saw with which it comes in contact. The member L is moved forward in the slot or groove H until all of the teeth on one side have been sharpened. The device is then reversed by swinging the main central frame a against the side frame B which was previously extended. This causes the jaws and saw blade between them to extend in the reverse direction to that first occupied by them. The member L is moved longitudinally of the jaw E until it reaches the end of the groove therein and then placed in the groove in the other jaw and the teeth on that side of the jaw sharpened.

The advantages of my improvements will be readily understood and appreciated by those skilled in the art to which it relates. Among such advantages may be noted the ease with which the operator can reverse the clamp to work on either side of the saw without changing the saw in the clamp, the lightness of construction enabling an operator to readily move the device from one position to another in order to obtain the correct reflection of light upon the saw, and the small space occupied byit when not in use, the side frames folding against the central frame as hereinbefore stated.

The jaws are preferably provided on their outer faces with a series of grooves which serve as guides for the lower edge of the file.

I am aware that changes in the form and proportion of parts and details of construc tion of the devices herein shown and described as an embodiment of my invention may be made without departing from the spirit or sacrificing the advantages thereof, and I therefore reserve the right to make such changes as fairly fall within the scope of the same.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a saw clamp, the combination of the central main frame, levers arranged on opposite sides of said frame and carrying clamping jaws, a continuous cam shaft extending across the main frame from one leg to the opposite one and passing between the levers carrying the jaws, and side frames of less length than the central frame and pivotally connected thereto, substantially as described.

2. In a saw clamp, the combination, with a suitable frame, of the jaws carried by said frame and each provided in their outer face with a longitudinal groove, a bed arranged to move longitudinally in said groove, an arm carried by said bed and adapted to turn freely in all directions, a sleeve carried by the outer free end of the arm, a longitudinally movable rod fitted in said sleeve, and

file carriers adjustably connected to said rod, substantially as described.

3. In a saw clamp, the combination with a supporting frame, of the jaws provided with the longitudinal grooves in their outer faces, means for moving said jaws laterally, a sliding bed fitted in the groove in one of the jaws, an arm having a ball and socket connection with the bed on the jaw and carrying a sleeve at its outer end, a rod extending through and movable longitudinally in said sleeve, and the file carriers adj ustably connected to said rod, substantially as described.

4. In a saw clamp, the combination, with a supporting frame, of the laterally movable and longitudinally grooved jaws, the metallic plates secured to the outer faces of the jaws and extending partially over the grooves therein, a bed provided on its under face with a rib which fits in the groove in one of the jaws and is provided on opposite sides with grooves to receive the inner edges of the metallic plates, an arm connected to said bed so as to turn freely in all directions, a sleeve supported at the outer free end of said arm, an endwise movable rod fitted in said sleeve and provided at one end with a handle and at its other end with an enlarged head, and file carriers adj ustably connected to said rod, substantially as and for the purpose described.

In testimony whereof I affix my signature in presence of two witnesses.

MARVEL DAYTON MINER.

Witnesses EDW. E. LYMAN, S. J. BUCK.

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