US178448A - Improvement in countersinks - Google Patents

Description

W. H. LAUGHLIN.

COUNTERSINKS. N.o.178,448. Patented June 6,1'8'76.

W171i asses,

UNITED STATES PATENT OFFICE.

WILLIAM H. LAUGHLIN, OF HINGKLEY, OHIO.

IMPROVEMENT IN COUNTERSINKS.

Specification forming part of Letters Patent No. 178,448, dated J une 6, 1876; application filed September 11, 1875.

To all whom it mag concern:

Be it known that I, W'ILLIAM H. LAUGIP LIN, of Hinckley, in the county of Medina and State of Ohio, have invented a Countersink, of which the following is a specification:

This invention relates to a device to be attached to a gimlet or auger-bit, whereby the countersink for a screw or bolt head may be cut at the same time and by the one operation of boring with the bit. It consists of a sleeve to be slipped onto the bit, and secured in the desired position thereon by a set-screw, and which is provided at its lower end with a detachable cutting-lip, as hereinafter described. The device is also provided with an adjustable stop, to provide for cutting the countersink to any required depth. p

To enable others to fully understand my invention, I proceed to describe the same in detail with the aid of the accompanying draw ing, in which Figure 1 represents a bit-having my improved countersink attached. Fig.-2 is a detached view of the sleeve with the cutting-lip detached. Fig. 3 is the detached lip. Fig. 4 is a reverse side view of the aforesaid sleeve and cutting-lip, showing the adjustable stop. Fig. 5 is an end view of the same. Fig. 6 represents a modified construction of the cuttinglip designed for cutting a plug-seat, together with the countersink.

A, Fig. 1, is a bit, which may be of the ordinary construction. B isa sleeve, having a longitudinal opening through it large enough to accommodate different-sized bits, and is partly cut away on one side, leaving a portion at the central part, in which is placed a setscrew, 0, for securing the device to the bit. The lower part of sleeve B has a cone-shaped projection, in which is formed a seat to receive a cone-shaped countersinkcutter, D. (Seen in detached view, Fig. 3.) The cutter D has a cutting-lip, d, which passes down to a point, so as to come into contact with the bit, whether the same be a large or small sized bit. The cavity in the said cutter D is not wardly-projecting cutting-lip, d This cutter is designed for cutting a plug-seat together with the countersink.

On one side of the sleeve is attached an adjustable stop, E, consisting of a slotted plate having a shoulder and projection, the point of which rests in a small groove in the side of the cone. Said plate is secured in place by a set-screw, c. This stop may be adjusted to allow the countersink to be cut any required depth, or turned up out of the way if not required for use.

This is a perfect device for cutting countersinks for screws or bolt-heads, and is "cry economical, from the fact that it is readily adapted to difl'erent-sized bits.

This device may be constructed in one piece instead of having the cutting-lips detachable, if desired, but it is preferable to make lips detachable on the score of economy.

Having described my invention, I claim The herein described countersink cutting device, consisting of the sleeve B, provided with the detachable cutter D, set-screw O, and

stop E, combined and arranged totoperate with the boring-bit A, substantially in the manner set forth.

WM. H. LAUGHLIN.

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