US1074044A - Percussive hammer. - Google Patents

Description

F. J. BROWN.

PERGUSSIVE HAMMER.

APPLICATION FILED 11.22.1913.

l1-,O74,@44cn Patented Sept 23,1913.

FIG.2

INVENTOR film @Mw itrEi) STATES i A ENT' oFiu'oE;

FRANK J. BROWN, OF SCOT'IXDALE, PENN$YLVANIL rnacussrvn HAMMER.

Specification of Letters Patent.

Application filed April 22, 1913. Serial No. 762.834.

Patented Sept. 23, 1913.

b all "Jun/tit may concern:

lie it known that I, FRANK J. BROWN, a

-('ltlZ( ll of the United States, residing at Seotlgdalc, in the county of \Vestmoreland and State of Pennsylvania, have invented 30 of percussive liainniers,and more particularly relates -to the construction and arrangement of novel means whereby the tools (letaehably mounted on the end of the hammer body are secured and held against accidental removal thereof from the hammer body' when the hammers are in use. 1 With such percussive hammers as constructed heretofore the tool mounted therein is loosely held so as toreeiprocate in the tool socket of the hammer body, and should the workmen become careless in using such hammers and the tool is not held in engagement with or closely adjacent to the object being operated upon by the tool, the drill, chisel, rivet snap or other tool being used has been projected for some distance and with considerable force out of the tool socket, and the flying tool is liable to strike and injure anyone in its path Of the various means proposed heretofore to prevent such occurrence none has beenentirely satisfactory and projecting portions of such mechanisms have been found to take up room and, hamper the workmen in operating the hammers, especially in close quarters.

One object of my inventionisto pro 'de whereby the detachable toolsused with such hammersare fastened and held' in position onvthe hammer. v

Another object of my invention is to pro: .vide a percussive hammer having a simple and conipacttool retainer in which the use ofprojecting parts is avoidedand overcome.

on an enlarged scale, showing the improved means whereby the tools are secured in ppmtion on the ammer in accordance withmy a percussive hammer having novel means Still further objects of'the invention will become apparent as the invention is more invention. Fig. 3 isa similar detail section showing a modification in the construction of tt 'llllllill'lel' embodying my invention. Fig-= 4 is a transverse section, on the line 1VIV of F ig. Qfshowing my improved tgol, retaining device asconstructed and opei'atively mounted on the eudof the hammer body in accordance with my invention;

Fig. 5 IS a transverse section similar to Fig. i .65

4, taken on the linc'V-V ofFig. 3. g

: In the acci'nnpanying drawings thenumoral 2 designates a hollow hammer body 1 havin" a iston 3 o erativel mounted therein and arranged to be actuated by means of compressed air or other suitable power means. The end of the drill body 2 has ai'educed portion 4 which is screw-.

threaded, and securedon the reduced portion 40f the body 2 is an internally-threaded collar 5 having an end 6 arranged to'en gage the shoulder formed at the junction of the reduced portion with the body 2. I

Mounted in the socket orhollow end of 'the hammer body. 2 is the shank 7 of a remoyable, tool,8,' which, in Figs. 1 andQ, is shown as a rivet snap. The'tool shank 7 has a cylindrical portion 9 and a taper portion'10 which connects the cylindrical por- .tion 9 with a smaller cylindrical portion 11 which is joined to a larger cylindrical portion 12, integrally connected to the flange 13 on the tool 8. Thecollar 5 is provided at one end with an inwardly extending flange 14 which coacts with the end of the reduced portion 4 to forma recess 15 in which the tool securing device is secured, asshown in Figs. 2 and 4 this device comprising a ball or series of balls 16.

In the modified construction shownmFig. 3 the tool body 2is provided with a piston 3 and, at itsouter end, with a reduced portion 4 on which a collar 5 is secured in the same manner as has been described. In this construction, however, the detachable tool 17, which is shown nsa 'drill, is of polygonal cross section and is mounted in the hammer socket. Thejdrill 17 has a polygonal shank 18 which is formed'of portions 19 and 20 of pol gon'al cross section joined byan in terme ia't'e tapering portion 21 also ofipolygonal cross section, the reduced portion 20r being joined to. and .forming'a shoulder--22 at the end of the drill 17.. In this construction, as will be seen by Figs. 3 and 5, a series of segments 23 areshown which are positioned in the recess formed by the collar 5 and the end of the hammer body and are constructed so as to engage with the sides of the shank 18. 1

The hammer is provided with the usual handle 24 and operating lever" 25 and with a connection 26 by which the hammer is connected, through a hose or other flexible rocating piston 3 within the hammer body.

tubular connectiori,--with an air pump other source of fluid pressure.

In the operation of my improved hammer the tool isengagedby the end of the recip- 2, when the piston is actuated by compressed air or'other impelling force. When thepiston 3 strikes the end of the tool shank'the tool is caused to move lengthwise in the phammer socket. The forcible ejection of the tool, however, is prevented by the engageinnt of the ball or balls'16 of the equivalent segmental members 23- used with tools having sockets of polygonal cross section, sothat, by engagement with the ,tapering portions" 10 or 21 ofthese sockets, removal of the tool therefromby the impactvof-the piston 3 is I prevented. In removing .a tool from the hammer body, the collar 5 is unscrewed for a sufiicient distance between the shoulder at the end of the reduced portion of the ham- 'mer body 2 andthe opposite inwardly extendingfiange '6 on the interior of the collar .5 so as-to'form a gap or recess ther ebetween 35 shank-of the tool being remov A tool is then inserted in place'and the'collar the parts are in the relative which will permit the balls 16 or segments 23 to be retracted by. engagement with the myhand.

The advantages of my invention will .be apparent to those skilled in the art.

The apparatus is simple and is easily and rangement of thc parts may be made without departing from my invention as defined in the el ims.

IclZim: 1. In a percussive hammer, a hollow hammer body haVing-a reciprocating piston, a tool socketin theend of the hammer body, a tool havinga taper shank positioned within the socket, a removable member engaging with the taper shank of the tool, to hold while permitting lengthwise movement oi the tool in the tool socket, and a collar detachably secured on the hammer body and having a counterbore forming a recess to receive the tool retaining member.

2. In a percussive hammer, a hollow hamtner body having a reciprocating piston, a tool socket' in the end of the hammer body,

--a tool having a' taper'shank positioned within the socket to be engaged by said piston,- a removable member engaging with the taper shank of the tool, to hold while permitting lengthwise movement of the tool in the tool socket, and acollarscrew threaded on the hammer body and having a counterbore forming a recess to're'ceive the tool retaining member.

' In testimony whereof, I- have hereunto set FBlA-NK J. BROWN.

Witnesses: p

J; T. KEITHLEY, W. S. WILEY.

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