US104982A - Improvement in grinding-rest for twist-drills - Google Patents

Description

UNITED STATES PATENTOFFIGE.

STEPHEN A. MORSE, OF NEVARK, NEV JERSEY, ASSIGNOR TO AMERICAN STANDARD TOOL COMPANY, OF SAME PLACE.

IMPROVEMENT IN GRINDING-REST FOR -TWlST-DRILLS.

Specification ihr-ming part oi' Letters Patent N0. 104,982, dated July 5, 1870.

To all whom it mafyooaoem:

Be it known that I, STEPHEN A. MonsE, ot' Newark, in 'the county of Essex and State ot' New Jersey, have invented a new and Improved Grinding-Rest for Twist-Drills; and I do hereby declare that the following isa full, clear', and exact description thereof, which will enable others skilled in the artto make and use the same, reference being had to the accompanying drawing, forming part oi' this specification, in which- Figure l represents a plan or top view of my improved grinding-rest. Fig. 2 is a front elevation of the same.

Similar letters of reference indicate correspending parts.

This invention has for its object to provide an adjustable rest by means ot' which twistdrills may be properly held against grindstones or grinding-wheels oi' suitable kind.

The invention consists, chiefly, in providing an oblique guide, on which the drill can be held and rocked in the same plane, so as to have its end ground at the desired angle.

The invention consists, also, in providing said guide with an adjustable curved arm, on which the drill can be moved; and, finally, in the combination, with the same, of two adjustable holders, as hereinafter more fully d escribed.

' A in the drawing represents the frame, in which the shaft B of the grinding-stone C is hung. This grinding stone is of suitable kind, material, and size. In the frame is formed a transverse socket, a, to receive the transverse lower arm, b, of the main holder D 0f the guide. A screw, o, clamps the arm bin the socket a. The upper end of the holder D carries another longitudinal socket, d, for receiving the longitudinal arm o of the main guide E, a screw, f, serving to clamp the arm o in d.

The main holder is a horizontal bar projecting at an angle of about thirty degrees backward from the face-plane of the grindstone.

A lip, g, projects from the guide E parallel with the edge of the stone.

The adjustment of the arm b in the socket a serves to fit the lip g at the requisite distance from the edge of any grinder of suitable diameter.

The drill to be ground is held against an arm, h," that projects downwardfrom the guide,

and against an adjustable curved bar, i, which is fitted upon the guide E, so as to slide on the same, a screw, j, serving to lock it in every desired position.

The arms h and t' serve to hold the drill always in the same oblique plane in which the guide projects from the stone. The drill is placed against the guide, as aforesaid, and with the end against the stone in such manner that the cutting-edge is horizontal. It is then gradually rocked, so as to raise the cuttingedge oft' the stone and grind the end for forming the requisite inclined face on the same.

The lip gis rounded, as shown, to allow the convenient rocking of the drill.

The adjustment of the arm e in el allows the guide to be set in or out, in accordance with the wear on the edge of the stone.

Having thus described my invention, I claim as new and desire to secure by Letters .Pat-

STEPHEN A. MORSE.

NVitnesses WM. BRADsHAw, C. l. SEABURY.

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