US2572487A - Manually operated impact tool - Google Patents

Description

Oct. 23, 1951 R. F. JACKSON l MANUALLY OPERATED IMPACTTOOL.

Filed Jan. 4, `1949 Q N N n@ ATTOR N EY Patented cf. 23, i951 UNITED 'S TAT-ES NT OFFICE MANUALLXQPERATED IMPAGTTOOL .Rupert Jochem, Gievelee 9919 Application January 4, 1949 Serial No. 69,200 I `4 enligne. (0112554143) This invention relates. to .a Yrnanueily zopereied impact ytool :particularly adepte. neetion wiihstoneor.mesonrydri too1s,.s,uo h as vstar drills, .esepeel .olly .dceoloed herein, althouehthe tool has m y Diller lees as will loe lmore partieilierly porrriefl out here@- after.

The ,impact `tool .disclosed .herein is in ille nature of an irnproyernentoo the Slrioiore eed mode of operation of the combinatignrtool .disclosed in Patent No. 716,274, granted to C. L. Pieroe. .Jron .eoernher .1.6, 1.99.2, endfiille P rmary .object of the invention is to greatly .irrcrease thehittine or .impact power 4of a Hemmer or plunger such es eiseiosed in ,Seid parent by attaching, .o ,n.errilole eleeiio o r flexible meerle .to said hammer yeineiinsiireeily -ootoeting `seid harnmer through for .by .of ,Seid eiesiie or exible .means- Another .obieet'of the .invention -io Provide an impact tool of the aforementioned type in whieh .the to91ve11i1elr-is eonneoieero thehe'rrioer or Aplunger 'Lgnide o r supporting rod'for limited relative .axial .movement whereby the shook off impe@ is not transmitted into the guide romand rod herrlle ilierebvotilirioeell ,of fille Power ,',f

mneoi directly on .the .tool iifSelf- Afiirtiier objectief tire inyentionis .to provide an impact tool of theaforementioned vtypein which Atheeiort or .Work required to V10e exerted by the operator, lboth `in creatingfthe impact and withstanding the l ifesliltenL1;` yibretipns or shock, is reduced toaininiiniim, therepydecreasing fatigue and .providing for'tlie 'accomplishment .of moreworl; by the operator Iin agiren length lof time.

Y Other and `further.oojeets of the invention ,will become apparent as` the .description proceeds. reference being made to the accompanying draw'- ing forming a part ofl rthe present'disclosiire, l

wherein:

Fig. r1 isa side 1elevational yew, v.partly in y.section,V of an impact tool constructed in accordance with the 'teaching of my invention; and

Fig. 2 isan .enlarged`l'sectiona1 view taken yalong K the une 2 2 of Fig. 1, lofiigmg Yin the direction of the arrows.

Referring in detail to 4the drawings, it wi11 be seen Atheir my imneoi .toolreomorises .an elongate guide rod If, bent at one end ,in the kftnjm'fofa loop to proyidega handle Vil,.prcerferably v,provided with ,a tubular vpipe 3 providing ,a .-holfnd grip. The loop providing @the henolle"2 iisrreiereblv closed Yand. may. be4 ,Welded at ,4 to provide alrigid structure. .Prererelilynneeoide-.roollserieerein ,onneieiioe olrii The riori- ,oneoiloo is preferred rsirroe it sobsiei- @ally llllefee ihebreekege of .oonneoiirre' pins, non 'in foree's rjro'i. o'rilirerl v those ynecesser to su ohlek ,erld'f'ool- ',Afn inwardly tapered eooke't H is provided 'in .the other .erro of 'the ,ohirogk .Silo errie'l'ellefrirert Luci.

atai

3 lines) are provided in the surface of the hammer substantially centrally longitudinally thereof. 'lhe spaced recesses I8 form a narrow rib I9 which is apertured as indicated at to receive one end 2| of a coil spring 22 and pivotally or swingably connect the same to the hammer.

A handle 23 comprising a U-shaped guard 24 connected thereto by means of a pin 25, is pivotally or swingably connected to the other end 26 of the spring 22 by means of a substantially z T-shaped bracket 2l, the leg 28 of which extends through an opening 29 in the guard 24 and is apertured as indicated at 3U to pivotally receive the end 26 of the spring. It will be obvious, of course, that the ends 2| and 26 of the spring 22 will be suitably bent to maintain their respective connections.

In operation, for drilling a hole in masonry, for example, the operator positions the tool I3 at the desired location by means of the handle 2 which is held in one hand, then, grasping the handle 23, the spring 22 is elongated or stretched andthe handle 23 is reciprocated through a distance which is small relative to the length of the rod I. This reciprocating motion of the handle 23-imparts a reciprocating motion to the plunger end 3I oi the hammer I6 with the rearward end l 32 of the chuck 5, and the impact or hitting power developed is many, many times that which may be developed if the hand is used to directly grasp the hammer I6 as disclosed in the aforementioned patent. In addition, the eort exerted by the operator is less since the handle 23 is moved through a very short distance as compared with the length of travel of the hammer IB.

During the hitting or impacting operation just described, the tool may be oscillated or turned when desired by means of the handle 2, and a further increase in hitting power is obtained, due to the slidable connection between the guide rod I and chuck 5. With this slidable connection, 'at the time of impact, the chuck 5 and tool I3 may move outwardly relative to the rod I, and thus very little if any of the shock of impact is transmitted into the guide rod I and handle 2, thereby using substantially all of the power of limpact directly on the tool I3. This slidable connection, and the spring 22, also function to substantially eliminate the transmission of shock to the hands and arms of the operator, thereby further decreasing expenditure of energy on the part of the operator and further increasing his eiiiciency.

In the preferred embodiment of my invention, I utilize the exible coil spring 22 to connect the handle 23 to the hammer I6, however, other exible elastic or resilient means such as a rubber band or rod may obviously be substituted for the coil spring and swingably connected to the hammer IB in any desired manner. Also, if a rubber band or rod is used, the handle 23 may be omitted and the end portion of such band or rod grasped directly.

Further, a flexible sling such as achain, rawhide, or rope, may be substituted for the elastic or resilient means, if desired, such slings having a'swingable connection with the hammer I6. Al-

4 though the impact power obtainable with such slings is somewhat less than that obtainable with elastic means,'the other advantages remain substantially the same.

Although for the purpose of exemplifying my invention I have disclosed speciiically herein an impact tool utilizing a star drill, it will be obvious that my impact tool has many other uses, and may be used, for examples, with stone or masonry cutting chisels, wood cutting chisels and gouges, sheet metal cutters, muier cutters, fender smoothing tools, ice chippers, nailing tools, and the like.

It may be pointed out that my impact tool may be operated with its longitudinal axis extending in any desired direction and is particularly adapted for overhead work due to the relatively short length of travel of the handle 23 required. Also, it may be used effectively to perform cutting, drilling, or other operations in smaller recesses than the tool disclosed in the above mentioned patent, for the reason that the flexible means disclosed herein requiresless space for operation than does the hand and arm of the operator.

While, as indicated above, I have disclosed herein the preferred embodiment of my invention, modiiications may occur to those skilled in the art, and it is my desire-to cover all such modications as come within'- the scope of the appended claims.

I claim: Y

1. In a manually operated impact tool comprising an elongate rod, a'tubular hammer mounted for reciprocating movement thereon, a chuck having an axially extending hole therein receiving one end of said rod, and means connecting said chuck to said rod, an elastic means pivotally connected to saidY hammer and having a free end adapted to be manually grasped whereby said elastic means may be 'swung to actuate said hammer.

2. In a manually operated impact tool comprising an elongate rod, a tubular hammer mounted for reciprocating movement thereon, a chuck having an axially extending hole therein receiving one end of said rod, and means connecting said chuck to said rod, a coil spring pivotally connected to said hammer, said coil spring having a free end, and a handle pivotally connected to said free end of said coil spring and adapted to be manually grasped whereby said coil spring may be swung to actuate said hammer.

3. In a manually operated impact tool comprising an elongate rod and a tubular hammer mounted for reciprocating movement-l thereon, a chuck having anfaxially extending hole therein receiving one end of said rod, an elongate slot in said chuck extending radially into said hole, a pin of lesser diameter than "the length of said slotsecured to said one endV of said rod and eX- tending into and slidable within said slot for connecting said chuck to said rod for relative limited axial sliding movement, and an elastic means pivotally connected to said hammer and having a free end adapted to be manually grasped whereby said elastic means may ,be swung to actuate said hammer.

4:'In a manually operated impact tool comprising an elongate rod and a tubular hammer mounted for reciprocating movement thereon, a chuck having an axially extending hole therein receiving one end of said rod, an elongate slot in said chuck extending radially into said hole, arpin of lesser diameter than the length of said slot secured to said one end of said rod and'exv tending into and slidable within said slot for connecting said chuck to said rod for relative limited axial sliding movement, and a coil spring pivotally connected to said hammer, said coil spring having a free end, and a handle pivotally connected to said free end of said coil spring and adapted to be manually grasped whereby said coil spring may be swung to actuate said hammer.

RUPERT F. JACKSON.

REFERENCES CITED The following references are of record in the le of this patent:

Number 6 UNITED STATES PATENTS Name Date Sherman Nov. 14, 1882 Leyner Aug. 16, 1898 Paulson Mar. 26, 1901 Pierce Dec. 16, 1902 Evans Aug. 20, 1907 Gunn Dec. 24, 1907 Gooch Dec. 31, 1912 Lodato Jan. 29, 1924 Chisholm July 9, 1929 Calderwood Aug. 8, 1933

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