US114098A - Improvement in polishing-machines - Google Patents

Description

SAMUELBEVAN. Improvement in Polishing-Machines. No. 114,098.

Patented April 25 1871.

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SAMUEL BEVAN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO HENRY DISSTON & SON, OF SAME PLACE.

Letters Patent No. 114,098, dated April 25 1871.

. IMPROVEMENT IN POLISHING-MACHINES.

The Schedule referred to in. these Letters Patent and mixing pan: of the name.

I, SAMUEL BEVAN, of Philadelphia, county of Philadelphia, State of Pennsylvania, have invented certain Mechanism. for Polishing Saw-Blades, of which the following is a specification.

Nature and Object of the Invention.

Figure 5, a view showinga modification of my invention.

General Description.

A and A are the opposite side frames of the machine, and are connected together at suitable points by transverse rods'a a.

B is a shaft, turning in suit-able bearings at the top of the side frames A and A, and to this shaft is secured a polishing-wheel or grindstone, G, and a pulley, D, for receiving a driving-belt.

E is a spindle, turning in bearings c e, which are arranged to slide in vertical guides, g g, secured to the horizontal portion A of the side'frames, the said bear ings resting npon springs composed of rubber blocks, (Z d, which, together with the bearings, can be adjusted vertically by a set-screw, s, the 'ends of the latter hearing against plates or'washers, h, beneath the said blocks.

To the spindle E are loosely hung two levers, F F, the long arms f f of which are furnished with adj ustable weights, W W, and to the short arms f" f are attached, by means of swivel-joints t, bearings o" 'r, for the spindle of -a roller, B, clothed with rubber or other suitable yielding material.

Strips of metal, t, bent to the staple-like form shown in fig. 2, are hooked to one of the transverse. rods c, and serve to limit the downward movement 0 the long arms of the levers F F. I

The saw-blade or other article of thin steel is placed on a strip, :0, of wood, and an operator holds this strip so that it shall bear on the roller while the blade ispressed upward .again'st the polishing-wheel with a force limited by the weighted arms; in fact, the strip, with its blade, is a lever resting on the roller R, as a fulcrum, yielding to a greater pressure than is necessary to polish the blade.

As the wheel revolves in the direction of the arrow the strip, with its blade, is carried forward as far and as fast as the operator will permit, and is then drawn back, and this is continued until the blade is completely polished by the wheel and theemery or other polishing material which may be used in conjunction with it, a uniformly-polished surface being imparted to the blade owingto the yielding fulcrum.

After the strip and blade have been withdrawn from between the roller R and the wheel the weighted levers F F will fall until arrested in their descent by the slots t, which prevent the roller from coming in contact with the wheel.

It has been before remarked that the levers F F are hung loosely on the spindle E, and that the bear-.

levers F F and their weights may be dispensed with and the spindle of the fulcrum-roller may revolve in bearings adapted to the guides g g', and resting on rub- 1 her blocks or other equivalent springs.

It will be seen that the feeding-roller R is not placed directly below the axis of the wheel 0. By this means a space is always left between the two for the introduction of the hand-board and the saw-plate carried by the same. roller is level with the lowest part of the wheel 0,

the plate, however thin it may be, is carried up against the wheel, and may be pressed against the latter with ant required force.

Claim.

The combination, with the revolving polishingwheel 0, of a yielding roller,- R, arranged below the wheel at one side of a vertical line drawn through the axis of thelatter, so as to form the fulcrum of a board carrying the plate to be polished, as set forth.

In' testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

SAMUEL BEVAN.

Witnesses:

A. H. SHOEMAKER, ARTHUR J. Coons.

As the upper surface of the

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