US434123A - Grinder for reaper and mower knives - Google Patents

Description

(No Model.)

W. A. WHITE. GRINDER FOR. REAPER AND MOWER KNIVES.

Patented Aug. 12, 1890.

q wwwooeo UNITED STATES ATENT OFFICE.

WVILLIAM A. IVIIITE, OF GLASTONBURY, CONNECTICUT, ASSIGNOR TO THE \VILLIAMS BROTHERS MANUFACTURING COMPANY, OF CONNECTICUT.

GRINDER FOR REAPER AND MOWER KNIVES.

SPECIFICATION forming partlof Letters Patent No.4=3 1,123, dated August 12, 1890.

Application filed September 20, 1888. Renewed February 24, 1890. Serial No. M1394. (N model.

To all whom it may concern:

Be it known that 1, WILLIAM A. WHITE, of Glastonbury, in the county of Hartford and State of Connecticut, have invented certain 5 Improvements in Grinders for Reaper and Mower Knives, of which the following is a specification.

This invention relates to a machine for grinding the scalloped knives or sickle-bars of mowing and reapin machines; audit consists in the combination, with a grindstone and gearing for rotating, the same, of a peculiarlyconstructed rest to support the knife and mechanism for automatically vibrating the same. In practice it has been found that the knives can be most advantageously sharpened by submitting them to the action of a flat rotary stone and moving their edges to and fro I thereon in the direction of their length. My rest is peculiarly constructed to the end that it may properly support and present to the stone knives differing in form and. shape, so that the stone will act on the cutting-edges in the manner above described.

In the accompanying drawings, Figure l is a perspective view of my machine. Fig. 2 is a top'plan view of the knife-clamp and the devices for supporting and adjusting the same. Referring to the drawings, A represents the rotary stone secured rigidly to the overhanging end of a horizontal shaft 13, which is supported in bearings on the upper end of a rigid standard C, firmly bolted to a base board or plate D. The shai' t of the stone is provided with a beveled pinion E, which receives motion from a larger beveled gear F, rigidly attached to a horizontal shaft G, which is seated at right'angles to the axis of the stone in bearings formed on the upper end of the standard C. This driving-shaft G is provided at one end with a hand-crank H, by which to turn it, and provided at the opposite end with a short crank I for the purpose of vibrating the knife rest or support, as hereinafter explained.

J represents a standard seated on a ribbed or grooved plate K on the base-board, secured by a bolt L so that it may be moved to and from the periphery of the stone and fixed rigidly in position. This standard J has its upper portion slot-ted or divided vertically to ened in any required position.

receive an upright arm or post M, which is mounted therein on a horizontal pivot N, and provided atits lower end with a rigid arm N, extending toward the stone. The free end of this arm is bent at right angles and provided With a slot m. A pitman O, mounted at its upper end on the crank I, is attached at its lower end to a thumb-screw a, passing through the slotted end of the arm I so that when the crank-shaft is turned to rotate the stone it acts through the intermediate parts to give a constant vibration to the post M, moving its upper end to and from the edge of the stone. The slot-ted end of the arm N is inclined from the horizontal, so that by changing the point of attachment of the pitman,as permitted by the slot, the upper end of the standard M is caused to stop in its approach at a greater or less distance from the stone. This feature is not claimed as of my invention.

To the upper end of the vibrating standard M, which is forked, as shown. to receive it, I connect by horizontal journals P a plate Q. This plate has an extended upper surface, as shown in the two figures, to receive and support an overlying 'plate or arm R, which is connected thereto at the end nearest the stone by a vertical pivot S. The rear or outer end of the plate R contains a grooved slot r, through which a thumb-screw r rises from the plate Q, this arrangement permitting the plate R to be turned horizontally and fast- Set-screws r are passed through opposite sides of the plate R into the ends of the slot to serve as stops 5 to limit the horizontal movement of the plate, so that the parts having beenadjusted with reference to a particular form of cutter the plate may be thrown quickly to the right or left and stopped at the desired point. The inner or forward end of the plate R is enlarged in the form of a vertical disk to receive and support a corresponding disk on the side of a plate or rest T, the two parts being connected bya central horizontal pivot t, which permits the part T to be rocked or tipped right or left.

The plate R is extended laterally and provided with an upright curved slot 1, through which a set-screw t is extended from the I plate T for the purpose of locking the latter in different positions. Set-screws Ware passed through the edges of the plate R into opposite ends of the slot r to limit the rocking action of the plate T. These screws, being properly adjusted, permit the plate to be tipped instantly from a given angle of inclination in one direction to a corresponding angle in the opposite direction.

The plate T has outreaching arms t suitably formed to underlie and sustain the knife or sickle bar U. Vhen laid in place thereon transversely of the stone, the knife-bar is confined by an overlying plate t, loosely connected to the plate T by vertical bolts t. A cam-lever t, acting on a pivot z) and beneath a bar i held by the bolts t serves to force the clamp-plate downward, and thus confine the knife firmly between it and the underlying support. This particulararrangement of the clamp-plate and lever are not claimed as of my invention.

In making use of my device the knife is confined in the clamp, as above described, after which the plate Risturned eitherto the right or the left and so adjusted as to present one edge of the teeth in lines parallel,or practically so, with the plane in which the wheel revolves. Thereafter the plate T is turned on its horizontal pivot until the beveled edge of the tooth is presented in a horizontal position, so that it will lie flatly on the face of the stone. In this condition of the parts the pivots P permit the rest and the knife to swing vertically, so that the knife rests with its entire weight upon the upper edge of the stone. If, now, the machine is set in motion, the stone will be revolved and act against the edge of one of the teeth, while at the same time the vibration of the standard M will carry the knife to and from the stone in such manner that the latter will grind back and forth along the edge of the tooth and in the direction of its length. After the edge of one cutter is ground the clamp is released, the knife-bar advanced edgewise to present the edge of the next tooth, and so on repeatedly, until all the cutters or knives are sharpened in one edge, after which the plate R is swung horizontally to its opposite extreme and the plate T tipped vertically until the knife-bar inclines in th opposite direction. v

I am aware that upright vibrating stand-' ards have been connected through horizontal and vertical pivots to knife-supporting clamps in various forms and under various arrangements; but I find that in order to adjust the parts to receive knives varying in size and in the angle of their cutting-edges and to present them properly to the stone it is necessary to have the various pivots located in the relations herein shown.

It is to be observed thatin my structure the standard M swings upon a horizontal pivot far below the top of the stone; that the other parts of the rest are freely connected to the upper end of this standard by a horizontal pivot located at a considerable distance from the stone; that the vertical pivot S is located at an intermediate pointbetwcen the standard and the stone, and that the knife rest or support has its horizontal axis located practically in line with the plane in which the knife is held.

Having thus described my invention, what I claim is- 1. In a grinder for reaper and mower knives, the grindstone, the horizontal shaft geared to the stone, as shown, and provided with handcrank H and crank I, in combination with the standard M, mounted on a horizontal pivot and proi'ided with the outreaching arm N, the pitman connecting said arm with the crank I, the plate Q, connected by a horizontal pivot to the upper end of standard M, the plate R, united by a vertical pivot to the plate Q, the fastening-screw for the plate R, and the knife restor support T, connected by a horizontal pivot to the end of plate R, and the clampingscrew to hold said plate '1 in position.

2. In a grinder for mower and reaper knives, and in combination with the grindstone, the vibrating standard M, mounted on ahorizontal axis near its lower end, the plate Q, connected by a horizontal pivot to the upper end of the standard, the plate R, connected by a vertical pivot to the plate Q, the two setscrews r? to arrest the motion of the plate R on its pivot, the fastening-screw r, and the knife-supporting clamp connected by a horizontal pivot to. the forward end of plate R.

3. In a grinder for mower and reaper knives,

and in combination with the grindstone, the

vibrating standard M, mounted on a horizontal pivot near its lower end, the plate Q, connected by a horizontal pivot to the upper end of the standard, the plate K, connected by a vertical pivot to plate Q, the knife-support T, connected by a horizontal pivot to plate R, the two adjustable stop-screws r to limit the motion of the knife-support upon its pivot, and a fastening-screw t to hold the same in position.

In testimony whereof 'I hereunto set my hand, this 5th day of September, 1888, in the presence of two attesting witnesses.

\VM. A. \VI-IITE.

YVitnesses:

M. T. RUssELL, WILLIAM S. GosLEE.

Images