US120700A - Improvement in machines for sharpening saws - Google Patents

Description

TENT OEEIOE.

NEWTON H. BOLTON, OF OMBO, WISCONSIN.

IMPROVEMENT IN MACHINES FOR SHARPENING SAWS.

Specification forming part of Letters Patent No. 120,700, dated November 7, 1871.

To all whom it may concern:

Be it known that I, NEWTON H. BOLTON, of Omro, in the county of Winnebago and State of Wisconsin, have invented a new and useful Improvement in Saw-Sharpening Machines; and I do hereby declare the following to be a full, clear,

and exact description thereof, which will en able others skilled in the art to Which my invention appertains to make and use the same, reference being had to the accompanying drawing forming part of this specification, in Which- Figure 1 is an end vieW of my improved machine, and Fig. 2 is a top view ofthe same.

Similar letters of reference indicate corresponding parts in both gures of the drawing.

My invention relates to a mechanism for sharpening circular or other mill-saws; and to that end consists in a metal frame, Within which is secured a shaft carrying an emery-Wheel so arranged Within a hollow mandrel as to admit of a longitudinal movement simultaneously with a rotating movement of the same, whereby the Wheel is adjusted to the teeth, the frame carrying the shaft and mandrel being pivoted to the main frame in a manner which admits of a tilting movement, by which the Wheel is adjusted to the dcsired pitch or angle ofthe tooth of the saw.

In the drawing, A is the frame, which may be as shown, or may be made in any manner that Will receive the moving parts of the machine. Firmly affixed to the front extremity of said frame are vertical uprights al a, which extend upward slightly above the upper surface ofthe same. To and between the said uprights is pivoted a horizontal metal frame, B, the form of which is shown in Fig. 2, and which is so arranged as to admit of atiltin g movement. Within and to the upper surface of the curved portion of said metal frame is secured ahollowmandrel, O, which is so arranged as to admit of a free and easy rotating movement. Upon said mandrel is secured a pulley, D, the center of which, laterally with the mandrel, is in line with the center ofthe pivots, securing the said frame to the uprights. Upon and around the said pulley is a belt, d, Which extends backward to and around Wheel D on the main driving-shaft E, which shaft is secured Within boxes c c affixed to the rear and upper surface of the frame. Mounted upon the outer end of said shaft E is a pulley,F, aroundwhich passes a belt (not shown) communicating with suitable machinery, from which the requisite power for rotating the mandrel is Obtained. Loosely affixed Within the said mandrel C is a shaft, C', one end of which is supported Within the box b, secured to the end of the frame B, the whole being so arranged as to allow the said shaft a free and easy longitudinal movement. W'ithin that portion of the said shaft, passing through the mandrelI provide a longitudinal groove or seat, which receives a setscreiv, g, secured to and Within the mandrel, by which a rotary motion is imparted to the shaft uniform with the rotation of the mandrel. Loosely secured Ward the main frame, is a metal slide, G, which is so arranged as to admit of a free and easy movement.V Firmly attached to, or formed as a part of said slide, is a rack, H, which engages a gear-Wheel, H', affixed to and upon the shaft I secured to and passing laterally through frame B, and is provided at its outer end with a crankvvheel, It, for rotating the same, by which means a reciprocal rectilinear movement may be imparted to the slide by the reciprocalrotary movement of wheel H. Within said slide, near its center, is a vertical groove, i, which receives a collar, J, rigidly secured upon shaft O', by which means alongitudinal movement is imparted to the shaft by the movement of the slide. Mounted upon the outer end of shaft C is an emery-Wheel, K, the peripherv of which is beveled to an angle near forty-five degrees to its sides, as shown in the drawing.

In using my said improved machine, the frame is arranged in a position which brings the emery-Wheel at a right angle with the saw and in close proximity to the teeth. A rotary motion is then imparted to the Wheel by the rotation of shaft O, which motion is communicated thereto fromthc main driving-wheelD of shaft E, through the medium of belt d, pulley D, and mandrel O, whereby the teeth of the saw are ground to the desired edge and pitch by the contact of the Wheel therewith; the tilting movement of the frame carrying the shaft, together with the longitudinal movement of the shaft, being such as to admit of adjusting the wheel to the desired point, thus enabling the operator to grind several teeth without a movement of the saw. It will be noticed that the center of the pulley upon the mandrel is in a line laterally With the pivots to and upon the side of frame B, tov C', slide G, rack, H, and Wheel Hf, as described, whereby a longitudinal movement may be iinparted to the said shaft C simultaneously With a tilting movement of the same, the Whole arranged to operate the emery-Wheel K, substantially as and for-the purpose specified.

NEWTON H. BOLTON. Witnesses:

W. S. M. ABBOTT,

E. '.1. ABBOTT. (131)

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