US17952A - Knives - Google Patents

Description

` UNITED STATES PATENT OFFICE.

ANTHONY HANKEY AND FRANCIS STILES, JR., OF LEIOESTER, MASSACHUSETTS, ASSIGNORS TO THEMSELVES AND FREDK. S. TAYLOR.

MACHINE FOR GRINDING KNIVES.

Specication of Letters Patent No. 17,952, dated August 4, 1857.

To all whom t may concern.'

Be it known that We, ANTHONY HANKEY and FRANCIS STILEs, J r., of Leicester, in the county of lVorcester and State of Massachusetts, have invented certain Improvements in Machines for Grinding Planing- Machine and ot-her Knives, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, making part of this specification, in which- Figure l is a plan of my machine. Fig.

' 2 is an elevation of the carriage in which the knife to be ground is clamped. Fig. 3 a section upon the line A A, of Fig. l.

Our invention has for its object to grind the faces of machine and other large knives, to a perfect plane at a single operation, which objectv we effect by clamping them in a compound carriage, so constructed and arranged that the knife maybe traversed back and forth horizontally and up and down in contact with a revolving grindstone, the face of the knife remaining constantly in a vertical plane.

To enable others skilled in the art to understand our invention and to build and use our machine we will proceed to describe its construction and operation.

In the said drawings B, is the knife which is held between the jaws a, and Z), the former being fixed and the latter operated to and from the other by a screw fl. The knife is thus held clamped to a plate C, which is hinged at the bottom c (Fig. 3) to a similar Y plate D, upon the ends of the latter are tongues c, which slide up and down in grooves 1n the upper carriage. This carriage consists of a head block E, and side pieces F, and slides in the direction of `the arrow upon the under carriage G. The

side pieces F, being embraced by and sliding between the side pieces R, of the carriage G. This under carriage runs upon ways I-I and is traversed back and forth by hand or otherwise. The position of the upper and under carriage with respect to each other is regulated `by the screws f, which pass through parts of the carriage G. The head blocks E, of the upper carriage are pivoted at g, to the side pieces F.

h, is a forked arm projecting back from the head block which embraces a screw rod rising from the carriage Gr, the upper carriage is thus allowed to slide transversely upon the carriage Gr, and the head block E, to tilt so as to throw the knife into the required position and is held in place when adjusted by the jam nuts m., and n. The plate C, may also be inclined upon its hinges c, with respect to the head block and is clamped in position by the screw z', passing through a slot in a short arm attached to the plate C.

It now remains to describe the manner in which the knife and the plates O and D are raised and lowered in the head block as the carriage is traversed upon its ways.

I, is a hand lever pivoted at p, to the head block E, and at g, to two arms or levers K, which vibrate around their centers in standards fw, rising from the head block and are hinged at their opposite extremities at fv, to the plate D. By means of these connections the knife may be vibrated up and down in a vertical plane at the will of the operator.

L is the grindstone which is revolved by power suitably applied.

Operation: The knife B, being clamped to the plate O, the plate and the head block E, are adjusted by the screws z', and Z6, to

bring the knife into the required position with respect to the grindstone. By means of the screws f, the upper carriage is thrown forward so as to cause the knife to bear with the required force upon the stone. The operator now takes hold of the handle I, and works it up and down, at the same time sliding the carriage past the stone; every portion of the face of the cutter is thus brought in contact with the stone, and the cutter is reduced to a perfect plane by a single traverse of the carriage Gr on the ways H. I/Vhen this is effected, the knife is tilted either by tilting the head block on the plate O, or by the combined motion of both as before explained, and the knife is again traversed in contact with the stone to form the bevel S. P is a screw stop which serves to limit the upward motion of the handle I, a similar stop being attached to the head block for the purpose of limiting its downward mot-ion if found necessary. The ways I-I, which carry the carriage are secured to the foundation N, which carries the stone, by a wedge T, or in any other suitable manner.

It is evident that by means of the above described machine, the work for which it is intended may be performed much more expeditiously and perfectly than can be accoinplished by the means heretofore einployed.

Thus far We have spoken of our invention as particularly applicable to grinding knives and other similar articles, it is evident that it is equally applicable to the purpose of polishing7 Where emery or other Wheels are employed.

1We do not Wish to confine ourselves to the' precise mechanical devices employed for the purpose of effecting the end Which We have in view7 as it is evident that there are various ineans which are equally capable of accomplishing the same. For instance, the carriage may be so arranged as to be raised l ANTHONY HANKEY. FRANCIS STILES, JR.

Vit-nesses AUGUSTUS O. BUNDY, DANIEL C. TOURTILLOT.

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