US173234A - Improvement in machines for grinding saw-teeth - Google Patents

Description

. ZSIieets-SheetIQ w. H. OGILVIE. MACHINE FOR GRINDING SAW-TEETH. NO.1 73,Z34. v mama Feb; 8, 1876.

N. PETERS, PHOTD-UTHOGRAFHER, WASHINGTON D. C.

UNITED STATEs PATENT QFFICE.

WILLIAM OGILVIE, or BROOKDYN, NEW YORK.

IMPROVEMENT IN M'AC HlNES Fb R e RmomeisAw- EETH.

Specification forming part of Letters Patent No. 173,234, datedFebruary 8, 1876; application filed 1 January 11, 1876.

To all whom itmay concern:

them in position and manipulating them in the operation of grinding being constructed with reference only to grinding this outer surface of the teeth-that is to say, the surface farthest from the center or back of the saw. As this'mode of grinding made no provision for rectifying the line of the under side of the. tooth as it was worn away, it was necessary to grind away the'tooth on its outer side till the proper or available surface of the;

under side of the tooth was reached, which involveda large amount of labor in grinding, -and a rapid using up of the teeth of the saw.

My invention is a machine adapted to properly grind both sides of the removable teeth of saws with regularity, exactness, and uniformity, so as to give proper cutting-edges without unnecessary waste of the teeth or unnecessary labor in grinding, substantially as hereinafter more fullyset forth. I

Figure 1 is a plan or top view of my machine. Fig. 2 isa side view, showing that side of the machine which is toward the bottom of the page .in Fig. 1. Fig. 3 is a vertical section on a plane parallel to the plane of Fig. 2, and passing through the center of the principal shaft. Fig. 4 is a detached View, in section, on a plane parallel to the planes of Figs. 2 and 3, showing more clearly the conthe posts B and O are secured. D is the main or principal shaft of the machine, which shaft is hung in the upper part. of the. .post B. This shaft D carries an emery wheel or 'disk, E, which has a grinding-surface on the side toward the saidpost B. It also carries the pulley F and friction-disk G, the pulley being .designed to receive motion by-means of a belt from some driving power, and the frictiondisk being designed to impart motion from the shaft D to the friction-wheel H,-anjd-by means thereof to the shaft I, hung in the post 0, which shall; I carries a small emery-wheeh'J. K is a slide-rest, having a pedestal or hanger, L, ex tending upward from it to receive the clamp which holds the teeth of the saw in position while being ground, said rest being arranged to slide upon a horizontal plane transverse to the planes of Figs. 2 and 3.

The clamp for holding the saw-teeth is com- 7 I posed of two jaws or levers, Mand N, connected by a pin or joint at a, as shown in Fig. 2, and their upper ends pressed together by a spring, b, to hold thesa'w-teeth 0 in position.

right or left, as shown in Fig. 2, to bring the ends of the teeth to be ground in contact with either the emery-wheel J or the side of the emery-wheel E, so as to grind both sides of the teeth without removing them from the clamp or changing their adjustment therein. For this purpose the pivot at dis arranged in as shown more particularly in Fig; 4, and to locate them so as to allow them to enter only the proper distance into the clamp, so that the teeth maybe ground "of uniform length, and this object is further facilitated by the setscrews 0 e in the hanger.L, which regulate the sweep of the clamp, and, consequently,

the depth of the grinding. The clamp is rep-' resented as adapted to hold, and as holding, three saw-teeth; but it may be adaptedjto hold any convenient number.

The posts-B and O are set in elongated openings in the bed A, as shown in Fig. 3, the-object being to allow'their adjustment to give the proper angles to the points of the teeth, and

the proper friction of the friction-wheel H The lever M is pivoted at d to the standard'L, so as to allow it to be swung to the upon the friction-disk G, which latter purpose is facilitated by the set-screw f, by which any small or minute adjustment. in this respect may be made.

It will be observed that the emery-wheel J is very small in diameter, the object being to grind the under side of the tooth on a sharp curve, so as to secure areasonably thin cuttingedge, and at the same time retain the neces sary strength of the tooth back from the cutting-edge, and also secure the advantage of the turn of the curve back of the point to aid in throwing off the sawdust, or atleast to give such a form as will not aid to retain it.

The dulled teeth, having been removed from the saw, are placed in position in the clamp, and the set-screws e 0 having been properly set to regulate the depth of the grinding, the teeth are first ground on the under side upon the emery-wheel J, and when this has been done the clamp is swung over to the right, and the outer side of the teeth ground upon the emery-disk E, when they are ready to be again inserted in the saw.

To insure uniform wear of the emery-wheels it is necessary that the teeth should he slid backward and forward upon them while being ground.

I claim as my invention- 1. The combination of the grinding-wheels E and J, the clamp for holding the saw-teeth while being ground, and the slide-rest K, substantially as hereinbeforeset forth.

2. The combination of the grinding-wheels E and J, the clamp for holding the saw-teeth, and the posts or supports for the shafts, made adjustable, substantially as and for the purpose hereinbefore set forth.

Witness my hand this 8th day of January, A. D. 1876. i

WILLIAM HENRY OGILVIE. Witnesses:

W. L. BENNEM, W. H. IsAAos.

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