US2936736A - Handle for percussive drill - Google Patents

Description

May 17, 1960 F. A. WERSTEIN HANDLE FOR PERCUSSIVE DRILL Filed Sept. 3, 1957 :5 2 36 24 30 34 K M /f I V r 2,936,736 V HANDLE LFOR PERCUSSIVE DRILL Frank'A'. Wei-stein, Long Beach, Ind assignor to Phillips Drill Company; Michigan City, Ind.', a corporation of "Illinois p v a Application September 3, 1957, Serial No. 681,688

2 Claims. (Cl.12136) i This invention relates generally to percussive drills for driving self-drilling shells ofthe expandible type or the like. and more particularly-relates to a novel'handle adapted to be installed on a percussive drill or mechanical hammer for rocking the chuck during use of the drill or hammer.

QInIthe mountin'gf'of self-drilling expandible shells. of

the general typershown in U.S. Patent No. 1,621,598,

use often is made of a percussive drill or mechanical hammer jwhichby repeated blows cause the teeth of the I shell to bite into the masonry or concrete in the process of drilling a'holefo'rithereafter anchoring the shell. Such a mechanical hammer is shown in US. Patent No. 1,968,055 inwhich the chuck mounting theshell is providedlwith-a handle pivotally mounted on an axis transverseto the axis of the chuck socket. The workman is enabled thereby to hold the hammer .urged against the surface in which the shell is to be anchored and simultaneously rock the chuck by means of the handle as the shell is bitinginto said surface. This invention is concerned primarily with a novel construction for such a handle.

Since the percussive forces required to anchor the shell are considerable, such hammers, of necessity, have been relatively heavy and are required to be carefully and tightlyheld during their use. Obviously-then, the handle bymeans of which the chuck of the hammer is rocked during hammering is required to withstand bending or other distortion while at the same time permitting adequate purchase thereon by the operator to prevent the hammer from slipping relative the wall in which the shell is being anchored. Heretofore such handles have been manufactured in a manner which contributed to an.expensive structure Such handles have been made from singlev lengths of heavy gauge metal wire or rod beat into U-shaped configuration. Such prior art structures have been characterized by their requiring special heavy; duty bending equipment and the exercise of exf'j x trme' caution and care in the" forming of the handle which necessarily increased thecost of the completed structure. Accordingly, it is a principal object of the invention to provide a novel handle for a mechanical hammer which enables ,thehereinabove disadvantages to besubstantially,- eliminated.

Another object of the .invention is to provide a handle for a percussive drill which is formed of a pair of complementary metal, parts secured. together to form the completed handle withoutfsacrifice of any strength or rigidity desired for such a structure.

Aif urther object of the invention is to provide a novel method for making a handle for a percussive drill which comprises forming a series of identical, generally L- shaped metal rods and securing together a pair of such of thehammer and'the chuck, the view being on an enrods in complementary relation one to the other to form the handle. I

The foregoing and other objects of the invention will become apparent from the ensuing description thereof in which a preferred embodiment has been described in ice detail in the specification and illustrated in the accompanyin'g drawing. It is contemplated that various minor changes in the structure embodying the invention may.

percussive drill comprising an electric hammer and having the handle embodying the invention installed at the chuck end thereof.

. Fig. 2 is' a sectional view taken through the barrel end larged scale. a I

Fig. 3 is a plan view of the handle showninstalled on the chuck of a hammer.

Fig. '4 is a sectional view taken through the chuck along the line 44 of Fig. 1 and in the direction in-- dicated. 1

Referring now to the drawing, the percussive drill or.

hammer is designated generally by the reference character 1,0. The specific construction of the hammer is not important to this invention except for structural features thereof which enable a workman to hold same by one hand at the handle (not shown) and push same forward during operation thereof. The forward end of the hammer carries a chuck 14 in whichis'mounted a self-drilling expandible shell 16 designed to be anchored in a masonry or concrete surface.

Referring to Fig. 2, the chuckp14 comprises an integral body or head 18 which may have a tapered axial socket 20 opening to opposite ends of the head. Said head may be provided with a reduced diameter shank 22 engaged in one of said open ends which is accommodated, telescopically in the barrel 24 and retained therein by the key 26 engaged in the annular groove 28 formed.

in said shank. The key 26 is retained in position by means of theelongate sleeve 30. Said sleeve 30 may be mounted on barrel 24 under spring tension maintaining same normally urged against stop 32' in position overlying said key 26. Operation of the percussive drill causes the hammer head 347t0 be reciprocated with repeated impact against the chuck end 36.

The chuck head 18 has a tapered socket 38 at its for- I ward end in which the shell 16 is mounted, said shell 16 including a cylindrical hollow body 40 provided with a toothed end 42 and adapted to be expanded along fracture grooves44. The opposite end of said shell has a tapered'extension46, the length and size of whichis designed fortelescopic engagement in the tapered socket '38 of the head. Such a shell may have an annular fracture 'groove 48 at the base of the extension 46 by means of which said extension may be broken off by application of lateral strain against the same after the shell has been anchored. Said chuck head 18 also has a transverse passageway'50 located between the inserted end of the extension 46 and the inner end of the reduced diameter shank 22, the passageway 50 enabling insertion of an ejector tool (not shown) behind the inserted end of extension 46 for ejecting the shell 16 from chuck head 18.

Arranged also transverse of the head but preferably normal to the passageway 50 and axial socket 20 is a transverse passageway 52 in which the handle embodying the Patented May 17, 1960 heavy gauge metal wire or rod members 56' and 58which' are of substantially the same configuration and size. Each member is substantially L-shaped and secured together in reversed relationship" so that theshorter legs 59 and'60' thereof are aligned facing one another at one end of the handle. Said shorter legs or extensions 59 and 60 are foreshortened with their extremities spaced apart so that when installed in the passageway 52, said extensions are clear of the axial socket 20 of the chuck as seen in the other so as to dispose the elongate straight extensions 63 and 64 at the opposite ends of the members parallel with and engaged adjacent one another. T he: elongate extensions 63 and 64-are' rigidly. secured together, preferably by Welding as indicated generally at 65 along facingsur faces thereof. The secured extensions 63 and '64p rovide ahand grip by means of whichhandle 54 may be held and rotated during operation of the hammer. A suitable sleeve (not shown) may be employed slipped over the hand grip for obtaining a better purchase onthe hand grip, said sleeve being formed of a soft plastic or other suitable material. 7

It thus will be seen that the handle 54 is made from a pair of substantially identical wire members of generally L-shaped configuration. Each memberhas the'elon'gate extension at the end thereof opposite the shorter leg' of the member offset from the longer leg of the member on th'same side as said shorter leg. A pair ofv members, upon being reversed, may be arranged with the saidelongate extensions parallel and juxtaposed one the other to form a hand grip for the handle. Sufficient limited resil iency is provided by the bends 62 of the secured members to enable the short legs 59 and 60 to be spread apart as required for installing or withdrawing the handle. With the joint formed at 65, sufficient rigidity is achieved for the handle members in their unitary assemblage 54'so that the chuck 14 may be rocked without distortion'of' said members. This handle is distinctive'over the prior art in" that a pair of identical wire or rod members are secured together in reversed relation thereby eliminating the practice of using a single length of wire or rod to form a generally reverse bent or U-shaped member. This, of course, eliminates the need for special and expensive bending equipment.

This construction can be advantageously made utilizing economical, mass-production techniques, for instance,

stamping out of individual lengths of wire or rod to the shape of a leg member 56 or 58, since they are identical.

Stamping may be simply accomplished in a forge .or die press machine in a single operation as the wire" or rod is moved -continuously through the machine. The stampings are then secured together in pairs, with the individual stampings thereof reversed one relative the other by welding or other known techniques. The joint preferably is 4 Serial No. 681,689, filed Sept; 3; 1957, copending herewith. Other forms of tool holder may be used, such as, for example, a known construction illustrated in U.S. Patent No. 2,767,988, in which the head 18 and the shank 22 are integral and no tapered opening is provided at the right hand end of the head 18.

It is believed the invention has been described in sufficient detail to enable the skilled artisan to understand and practice the same.

ly construed commensurate with the progress in the arts and sciences contributed by the invention.

What it is desired to secure by Letters Patent of the United States is:

1. A handle for use with a power hammer provided with a tool holder having a transverse passageway therethrough adapted to mount the handle for rocking said holder during operation of the'hammer for' installing self: drilling expansion shells, said handle comprising, a p'air of substantially L-shape'd rod members secured together in a unitary assemblage,jeachjmember comprising a s length of relatively heavy gauge metal of substantially identicalsize and configuration and secured in reversed relation one relative the other, said handle having a pair of spaced apart and inwardly facing extensions atone end thereof adapted to be telescoped respectively into an end of said passageway and a pair of rigidly conjoined elongate gripping extensions at the opposite end thereof for holding the handle'during operation oft hehammer, each member having a segment. intermediate saidextensions' thereof arranged at substantially a right angle to'the in wardly facing extension and diagonal to the gripping extension thereof. o

2. A handle for use with a power hammer mounting a chuck having a transverse passageway therethrough for installing self-drilling expansion shells in masonry, said handle adapted to be installed to permit the chuck to be rocked during operation of the hammer and comprising, a pair of heavy wire members of substantially identical size'and configuration secured together in a unitary assemblage with said members reversed one relative the other, each member comprising a single length of uni;

form diameter wire having a short extension thereof at one end of the handle spaced from and facing theextension on'the other member a straight segment sub'stan: tially at a right angle to said short extension and'an'elon gate extension at the opposite end of the member parallel to and juxtaposed the elongate extension on the other member, said elongate extensions'having surfaces there of engaged one with the other and rigidly welded together alongisaid engaged surfaces to form a handle for said assemblage, said members having limited resiliency adja:

cent said elongate extensions to; permit the short aten si'ons to be'spread onerelative the otherforengaging the short extensions 'in said passageway to install said handle.

ReferencesCited in'the file of thisspatent UNITED STATES PATENTS 606,970 Hussey June 5, 1898 856,733 Laifold June 11', 1907 1,968,055 Phillips J'uly'31, 1934 2,399,939 Phillips May 7, 1946' 2,401,794 Pratt June 11, 1946 2,498,963 Piercey Feb. 28, 1950 2,794,622 Phillips June 4, 1957 2,801,614 Dieterich et al Aug. 6, 1957 e in n s bee po nted out in the appended claims in termsintended to be broad-

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