US898663A - Machine for sharpening rock-drills. - Google Patents

Description

B. H. LOGKE. MACHINE FOR SHARPENING ROCK DRILLS.

APPLICATION FILED JUNE 4,19 0'7.

Patented Sept. 15, 1908.

2 SHEETS-SHEET 2..

IM My UNITED STATES RATENT BEIGE.

BRADFORD H. LOOKE, OF NEW YORK, N. Y.

MACHINE FOR SHARPENING ROOK-DRILLS.

T 0 all whom it may concern:

Be it known that I, BRADFORD H. LOOKE, a citizen of the United States, residing in the borough of Manhattan, of the city of New York, in the State of New York, have invented certain new and useful Improvements in Machines for Sharpening Rock-Drills, of which the following is a specification, reference being had to the accompanying drawings, forming a part hereof.

Rock drills or drill bits, especially those used with power machines, commonly have their cutting edges in the form of a cross. They are usually sharpened or reset by hand r with the aid of suitable appliances and by reason of the shape of the cutting ends, above referred to, much skill is required in sharpening or resetting them. Moreover, much difficulty is involved in the sharpening of such drills when, as is generally the case, they have long stocks and are of considerable size.

It has been proposed, heretofore, to provide machines for the pupose of sharpening such drills, but such machines have not come into general use, partly, perhaps, for the reason that the drill itself has been held stationary and the sharpening die has been made to strike the end of the drill. Much floor space is required for machines of this character because the meohanism which reciprocates the die or hammer must be in line with the drill itself. Moreover it is impossible to make use of the weight of the die or hammer and its carrier in striking the blow because it is generally impracticable to support the drill vertically from below. It has also been pro posed to reciprocate the drill itself horizontally, causing it to strike a stationary die, but in such a machine the advantage of the weight of the reciprocating part in striking the blow is lost, and moreover the shaping of the drill head can not be properly effected with a die against the face of which the drill head is made to strike. It is the object of the present invention to overcome the difliculties above alluded to and to produce a drill sharpening machine which shall be cap able of giving to the drill head the exact shape desired and in which the full weight of the drill itself shall be taken advantage of in striking the forming blow, while the machine itself occupies but little floor space and can be readily operated.

In accordance with the invention the drill is made to reciprocate vertically with the die secured to its head or working end, the latter Specification of Letters Patent.

Application filed June 4, 1907.

I striking upon a suitable anvil at each reciprooation so that the drill is driven by its own momentum into the die and is made thereby to take the desired shape.

hereinafter with reference to the accompanying drawings in which it is illustrated as embodied in a suitable mechanism.

In the drawings-Figure l is a view in side elevation of a drill sharpening machine which embodies the invention, the anvil support being shown partly in section. Fig. 2 is a view of the same in front elevation. Fig. 3 is a detail view in section on the plane indicated by the line 3 3 of Fig. 1, looking downward, on a larger scale. Fig. 4 is a detail view in section on the plane indicated by the line 44 of Fig. 1, also looking downward, 1

In the machine shown in the drawings the working parts are supported upon a substantial frame a. In suitable bearings at the top of the frame is mounted a shaft 6 which may be driven by any suitable means, as by a belt 0 from a motor (Z. A head 6, suitably guided in the front frame a for vertical movement, is reoiprocated through the usual spring and strap connection f of a power hammer from a crank pin 1) carried by a crank disk D on the shaft 1). The head e is adapted to have the drill stock g firmly se cured thereto that it may reciprocate therewith vertically. For this purpose a suitable clamp h is provided, the same comprising, as shown in the drawings, links it which are pivoted upon the ends of studs 7L carried by the head e, and a front cross bar or clamping bar 71,3 which is pivotally connected to the links it at one end and at the other end is engaged by eccentric clamping devices hf which are carried by the links it at that side.

A wedge 72,, with its thick end down, is preferably interposed between the cross bar 7L3 and the shank of the drill stock 9 so that the anvil below it, through the interposed die, shall be to cause the drill to be more securely held. Below the drill and in line therewith is placed a suitable anvil t, having a plain striking face.

The die 7r which is to shape the drill head is so formed as to be capable of being secured to the working end of the drill stock and to reciprocate therewith, striking upon the anvil 'i at each reciprocation. The construction of the die 76 may vary according to The invention will be more fully explained eifect of the blows of the drill against the.

the work to be done. The die shown in the drawings comprises a head block 7c adapted to strike upon the anvil t and having its working face suitably formed to give the desired shape to the drill face, and two members k and k which are adapted to embrace the drill head and to give the desired shape thereto. The two members k and k are pivotally mounted upon a stud 10 carried by the head block 7c and are provided each with a tapering lip or projection is, or one with a straight lip and the other with a tapering lip, both of which are adapted to be embraced by a clamp or yoke 7c which is pivotally mounted upon the head block 76 and is provided with weighted arms k which serve to hold the clamp or yoke in place when the machine is in operation. For convenience in construction the pivot block 7c of the yoke or clamp is and the stud k may be secured to the head block k by a single bolt 70 as shown in Fig. 1.

In the operation of the machine the drill to be sharpened is firmly clamped to the reciprocating head 6 and the die is is clamped upon its end the drill being so set in the clamp h as to permit the head block 7r to strike the anvil i. Power is then applied to the shaft 1) as by means of the belt tightener Z and foot lever m, and the die is battered against the anvil i. In this operation the drill head is gradually niushroomed within the die until it takes the shape of the die chamber and is thereby sharpened or reset.

The operation of sharpening the drill is carried on quite rapidly for the reason that the entire weight of the drill and of the reciprocating parts which carry it is utilized in striking the anvil. Moreover, the machine requires for its operation but an extremely limited floor space and no pit, the drill being held vertically above the anvil. N o adjustment of the die or of the drill in its holder is required after the drill is once properly set, for-the reason that as the die travels with the drill it is driven further upon the stock of the drill as the head is formed and the yielding of the mechanism which reciprocates the drill is sufficient to compensate for such shortening of the drill as takes place through the formation or sharpening of the head.

It will be obvious that various changes in details of construction and arrangement can be made to suit different conditions of use Without departing from the spirit of the in Vention.

I claim as my invention:

1. A die .for sharpening drills and adapted to be secured to the drill head, the same comprising a head block, die members pivotally mounted thereon and adapted to embrace the drill head, and a clamping device carried by the head block and engaging the die members to hold them securely about the drill head.

2. A die for sharpening drills and adapted to be secured to the drill head, the same comprising a head block, a stud carried thereby,

die members mounted upon said stud and having projecting lips and a yoke pivoted upon the head block and engaging said proj ecting lips to hold'the die members securely about the drill head.

3. A die for sharpening drills and adapted to be secured to the drill head, the same comprising a head block, a stud carried thereby, die members mounted uponsaid stud and having projecting lips and a yoke pivoted upon the head block and engaging said projecting lips to hold the die members securely about the drill, said yoke having a weighted arm to hold it in engagement with the lips of the die members.

This specification signed and witnessed this 31st day of May, A. D. 1907.

BRADFORD H. LOOKE.

Signed in the presence of- ELLA J. KRUGER, AMBRosE L. OSHEA.

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