US108775A - Improvement in machines for grinding saw-blades - Google Patents

Description

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CHARLES J. GARDNER, OE PHILADELPHIA, PENNSYLVANIA.

l Letters Patent No. 108,775, dated November 1,1870.

IIVIPROVENIENI"v IN MACHINES FDR GRINDING SW-BLADES.

The Schedule referred to in these Letters Patent and'aaking part of the same.

To all who-m it may concern:

Be it known that I, CHARLES J. GARDNER, ot'

Philadelphia, in the county' of Philadelphia and State of Pennsylvania, have invented a new and improved Machine for Grinding Saw-Blades; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawing forming part.

of this specification, in'which Figure 1 represents a side elevation, partly in scction, of my improved saw-grinding machine.

Figure 2 is a plan or tcp view o'- the same.A

Similar letters of reference indicate corresponding tary grinding-stones in swiveled shafts, which allow the setting of the grinding-faces at any desired angle to each other.

The invention consists, also, in the combination therewith of reciprocating holders for the saw-blades, and in the use oi' an adjustable shoe, by which the taper of the blade toward the back.is regulated.

A in the drawing represents the frame of my improved saw-blade grinding-machine.V This frame is made of wood, or other material ot' suitable size and form to contain the machinery connected with the grinding apparatus,

In the lower part of the frame A is hung the horizontal longitudinal driving-shaft B, which receives rotary motion by suitable mechanism.

Above the shaft B are hung, in adjustable bearings, (i. the grindstone shafts OG, which carry, on their inner` ends, the circular grindstones I), ot' suitable material. The grinding-faces of the stones D are opposite each other and near together, as shown.

The inner bearing a of each shaft C is pivoted or swivele'd to the frame A. The outer bearing, however, has a tenon fitting through a circular slot or groove, c, and is, by a rod, d, connected with acrauk,

j; on a rook-shaft, E, which has a projecting handle,

e, whereby it can be turned. By means of the handle e the bearing b can be set so as to put the shafts C into any desired oblique position, setting, thereby, .the grinding-faces of the stones D also obliqnely, as shown in iig. 2. The edges,which are thus 'brought near together, will thereby 'regulate the thickness to which the blade is to be ground. The stones can, in this manner, be set oblique, to be .close together at either side of the machine.

Belts, g y, or other mechanism,"scrvc to impart rotary lnotion to the shafts C. The lmachine has a guide on each side, for holding a saw, one side being adapted to the grinding of hand-2 saws, while the other side is for circular saws.

The hand-saw F is pivoted to a slide, G, which moves in a grooved guide, h, and is, by means -of' al rod, i, connected with the crank of a rock-shaft, H; rlhe rock-shaft H receives oscillating motion from the driving-shaft B, either by the connectonsj kl, shown in iig.,1, or by other suitablelrneans.

lIhe lower edge ot' the hand-saw rests on a shoe,.-I.Q- which'can be adjusted up and down by meauslotf` screws, m, to regulate the inclination of thegb de.

.The blade, by hanging in an inclined position'gfis ground more at the top than at the lo'w er edge, and receives, thereby, thc'desircd taper in thickness.

\Vhile the stones revolve inthe same direction, the saw is moved back and forth between them by means ot' the slideG, which receives reciprocating from the rock-shaft H.

rIhe circular' saw is secured in a slotted crank, n, of' a rock-shaft, J, which receives oscillating motion from 5 the shaft B by means of the connections le I, or other mechanism.

When the circular saw is to be ground the grindingstones are drawn together at the side on which said saw is held.

" Itis evident that the machine can also be used for grinding other flat implements besides saws.

Having thus described my invention,

I claim as new and desire to secure by Letters Patent- 1. The arrangement of the stones D Drsubstantially as shown and described, so that the. saw-blades may be ground between their dat surfaces, as specified.

2. The grindstones D, hung on shafts C, which hang in swiveled and adjustable bearings` lo b, substantially as-herein shown and described, so that the grinding-surfaces canbc adjusted at any desiredangle, as specified. f

3. The combination of the outer bearings b with vthe rock-shaft E, by means of which the shafts O are adjusted, as specified. I

4. The slide Ur, arranged for holding the hand-saws, and connectedwith the rock-shaft H, substantially as herein shown and described, to operate as set forth.

5. The vertically-adjustable shoe I, combined with? the reciprocating saw-blade and with'the oblique grinders, substantially as herein shown and described.

CHARLESJ. GARDNER. Witnesses:

A. V. Bumsen, T. B. Mosrmn.

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