US1321272A - Chisel - Google Patents

Description

P JURICH.

CHISEL.

APPLICATION FILED JUNE 13, I919.

Patented N 0v. 11, 1919.

' UNITED STATES PATENT OFFICE.

PAUL JURICH, 0F DONORA, PENNSYLVANIA.

CHISEL.

Specification of Letters Patent.

Application filed .Tun'e 13, 1919. Serial No. 303,880.

A further object of the inventionis to provide a hand-guard for drills and the like whereby the driving member or hammer is views and in which tion, and forming a away and prevented from striking the hand of the person maintaining the drill upright duringthe operation thereof.

With these general objects in view theinvention consists of the arrangement of parts hereinafter more fully described, in connection with the accompanying drawings, and in which like reference characters designate corresponding parts throughout the several like designating characters are. employed throughout In the drawing, i

Figure 1 is an elevational view of the invention illustrating its manner of use, parts being shown by dotted lines indicating the position of the hammer and hand during a misstroke.

Fig. 2 is a vertical radial view through the invention taken upon an enlarged scale mounted upon the drill partially broken Fig. 3 is a top plan view of the invention partially broken away.

In forcing a tool into the work such as a drill, into the ground or rock, it i customary to hold the drill as 10 with one hand 11 while striking upon the top 12 of the drill by means of a hammer 13 in the other hand 1d of the operator while it will be apparent that one person may hold the drill and the other wield the hammer.

The drill 10 having the usual penetrating point 15 at one end has a reduced shank 16 at its opposite end, rectangular in cross secshoulder 17 at theinner end of the shank. A solid hemisphere or guard 18 formed of suitable material such as metal, is movably positioned upon the shank 16 by a central rectangular opening 19 through the guard, the flat side 20 of the guard belng upper and outermost when in use with the curved seated upon the shoulder 17 An angular groove 21 in the guard top 20 1s filled with metal 22, preferably softer than that of which the guard 18 is formed, the sides 23 of the groove being recessed for retaming the softer metal 22 inthe groove 21. The metal 22lies flush 20 of the guard and constitutes substantially the entire exposed surface thereof adapted to be hit by the hammer 13 when the latter misses or slips off of the end 12 of the drill Patented Nov. 11 1919.

portion of the guard 10. The central hub portion 24 of the guard 18 surrounding the opening 19 will rarely receive the blow of the hammer 13 by reason of its proximity to the shank 16 while the portion of the guard top 20 outwardly of the filler or metal 22 is comparatively narrow and considerably spaced-from the shank 16 and not liable to be hit by the hammer 13.

The complete operation of the invention a will be apparent, the guard 18 being readily positioned upon the shank 1 6. of a drill or tool 10 of any desired form. The drill is grasped as by the hand 11 at a point beneath the guard 18 for maintaining the drill upright on the rock 25 while the hammer 13 is used for striking the outer end 12 of the drill. If the hammer 13 misses the drill end 12, and strikes the soft metal filling 22 of the guard 18 as illustrated by dotted lines in Fig. 1, the holding hand 11 will be uninjured by the blow while the hand would be, likely to be injured in the absence of my I guard 18.

It will be understood that different metals 1 may be employed for maintaining the guard 18 and filling 22 and while the preferred form is herein set forth, minor changes may be made without departing from the spirit and scope of the invention as claimed.

What I claim is 1. A- guard fordrills and the like comprising a body adapted for mounting upon a drill adjacent the striking end thereof and an insert .of relatively soft material provided in the outer face of the body.

2. Incombination with a drill having an end adapted, to be hit during the drilling operation and provided with a shoulder, a.

body seated upon said shoulder movably positioned on the shank and relatively softer material than the body carried by the top of the body adjacent to and surrounding the'hitting end of the drill.

3. In combination with a drill, having a reduced end portion forming a shank with a shoulder at the upper end of the shank, a metal body having a central opening adapted for receiving the shank when the, 'body is seated upon the shoulder with the body is seated upon the shoulder and metal relatively softer than said body positioned upon the top thereof surrounding the shank,

the said body having an annular groove in its upper flat face With undercut sides for the groove and relatively softer metal within said groove flush with the upper flat face of the body.

5. A device of the class described comprising a metal body having an axial opening and with an annular groove in the upper side of the body forming a hub surrounding one end of the opening and a relatively soft metal filling within said groove the walls of the groove and soft metal iill-' ing coaoting to retain the metal filling in position.

In testimony whereof I afiix my signature.

' PAUL JURICH.

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