US1824935A - Percussion mechanism for tools - Google Patents

Description

P 29, 1931- G. H. THOMPSON 1,324,935

PERCUSSION MECHANISM FOR TOOLS Filed March 30, 1928 3 Sheets-Sheet l FIGI FIGZ m-um 3 Sept. 29, 1931. G. H. THOMPSON PERCUSSION MECHANISM FOR TOOLS Filed March '30, 1928 3 Sheets-Sheet 2 Sept. 29. 1931'.

PERCUSSION MECHANISM FOR TOOLS G, H. THOMPSON 1,824,935

Filed March 50, 1928 5 Sheets-Sheet I5 FIG. 6 4

IN vE/v7- Patented Sept. 29, 1931 A NT OFFICE GEORGE Jimm wnpmzsolwor ,snLLY on, BIRMINGHAM, Enemy];

- frmoussmli mcn lsm QB TOOLS Application filedmarcil 1928,, swarm. 265,935,-;and.1n r at Britain x 31, 1927. This invention elates to improvements in percussion mechanism for usej'in: percussion hand or other too ls,"sueh ias'aoi'ripping bride scaling tools, rivetingtools, c0ncriete;bnekers; road-breakers, coefl euttens; ieo'alhbonis,

and the like. ln suoh tooi'gftheiperopsion aetionof the-operutiwe'hwdor rdii'iil lgiusuafly p reduced byon' or moi'epereussiion members carried by a body or cagefwuhieh 1a at'a'hi-ghspeed; the iereuss'ion membemibing iiree -to' fly goutwii rdly undemeentrifugail plane f thea-Xisof rotation. u

Figure12 isia longitudinal section in a plane at right ang'lesto the .axis of rotation; .1. Figure Bids a' seot-ionsimiiar to thatiof-Ei e- 1' une @"butishow-ing the user-of two percussion baHs.1:2-W..; 1;; b 1 'f e iiiguneiiAizisna-l similar, 'seotion :showing .221: modifiediamra-n'gement ofmhe-JoaHs.

through 1.31 inomplefie tool w emhody force as thebody ores'vgwrotmtes lo nd to stnike the @pemuye 1183a or a: gssoo' ated theme Considerable difiieuity n signing and manuiaotui'i gjpercussion :yneeh anisin *wh igh ,w il-i 3ta nd up to the heavyi stressesj invdived' without xfifik age-orfzwpiil wea'r, u&11 whib11 gailgfie same v time-oun beprodueed nt a -regeongible eost fl 1901612 The ob-jeot of my invention is to -prov ide impro-ved meehalniem 'wli'ih 1% ecsoiiomicaiutp produce and inwhih uhe weighp'obxhe {$0 tzmfy fpaiits othei -the pei ous's ion inem "be: or members is ai minimum that the stresses are orresponfiingily ediieedif My improved meehanism filso lendsgteelf ate very accurate manning: u d baianein i therotating'pnnts toreduee ear m "I-n percussion meehanismueeeordi g' to invention pereusiibn 'inem'bers' in the of solid bells are ifilyfiuiitd: in "radial oyiindficzfl bore-s in an wa ifirl'iioh is rotated thi ough suitdblegeuning b eny eev ninp ower-driving means ana tmi me power may eonvenientl y' be Veyd jto jfliemeciizinisin by'ia fixibie shafit f-hi body" M rotates --'the baill s"'it l=e thn(kwn outwgiuly in is their bores and are edafited tojstiike he n"-* ner end ofgthe tool of 11 gliding fzlfiirgef engaging the tool; the tbdi in "Ringer referably offset n om the n x-is bn'd x 'q so that thebfliows' ap tflied l '2 i plunger may be as nee y-ngiial as "801116 pl aot'ieailf "fl et-per us'si 4 nis'in in aoooL'da-nce with invent-10 illustrated in the aeeolnfmnying di'aiyingsinl wh iohz* 1 reoives the Figure 1 is a longitudinal sectio tii'io w msm.

aoat -'Eigu1' :5 but embodying the :percus:

npenieneedinde- H I b I smn mechanism illustrated an :Figures 1 511612;

nnthe ,hdllOW! egy-lindrio a-L steel tube but is :p rlezfer ably;

eiirly when ifinishedn'by a moi which leaves inn 1 keyediiinsenibledin" ita'p er. :piniior: thnoughith'e" ibodiy and plug; the plug '6 mayvbe lockedabyaa' setiscr ew;

ilihmplugfi has an iinwandiy pmj eotingz-ne-p r st xc'ainnoti move tinw andly I tfiir ibald' lFo ousl lion Zthe in wa'rd movement 1 of the 7 3 ranged 'in fihe annular space 5 is: aiilongitndina'l mertieal: section ing at simpiifiedxform of ipenoussion mechm "Figure oiisla ie iiiflliibiithtebibn the 115$ inwardly projecting flange 4 ialround wi'cen having substantially the same contour 'as the baill fori'jvhiohififornis zn stop; f Screwed into th'e'zopeniendioif thezbdre is ailplug I6 whioh 'ris sition after-the mechanism jiSfiaS-T E; key-:7 driven Alternatiyely the ba'lliand form a stop for its in-ward lnozvpx menu The length of thiQ-xbossds suchwthmt under rebound: or when thef'mcimr F fmiits eentneiof 5. gravity ito :passathe t and the man-v; muet always be th own outvva vd lyabyeentnirtg I ugSHforcLe-ftoWaBdS thesame'endmf the body;

one form ;0f'percussion mechanismin ithe :In the;menhanie1n iil'lustnated; inliigultessli and 2 l'iijSlEEjPQIGliSSiQH member iin-.,tiie-rfqimr of a E'sohd isteei hazli whieh lis'fireely mounted #10 housing 1.0;; =:body:=;3.; This body; anny I be ins. unach-ined 1 from; T the" solid? aiEhebodylis :bonedfiom one: end a fthi oughstothe other.-.end,;and-?the under rebound :a' coiled spning (9 may Hoe are? b'etween the boss 8 end-the iotidzyflshelend ofithe :spni ng iwshien 8111 -fi o'j cfii-Ikg a lsho'rit; distance beyond theendaof theuboss. Ari aziialihnle 1M portions of a cylindrical surface havingficlief disc, the periphery of the opening being of complementary form: In either case the plug; has an integralaxial rod-23xwhich passes:

ball bearing in a suitable casing'and one trunnlon has-ascrewed extenslon15 to rece vea gear wheel or the like for driving the body.

' The centralpart ofthebody is preferably I formed with a thickened bandTrIQ a-hd'flat bosses'are machined on this band' around. the holes for the trunni'onscto form'cabutm'ents againstiwhi'ch thetrunnions are welded. T

.The' ends of the body are machinedito 'form same'ax-isa's the axis of roa'tion ofthe body, as shown 1n Figure '2,and'thlszmachnnng .and the final machiningofitlie trunnions are preferably eifected'aft'er th'e trunni'ons'g have been secured imp-lace to ensureperfect symmetry and truth of the rotating parts.

beyond the p'eripheralsurface of the end'of thebody, and a groove 17 'is-I nachin ed in each end of the body for the'passa'g'e of'th'e endiof a reciprocatingplunger orof the drill or" other tool which projects inwardly from acasing sufficiently far to 'beengaged by the balloniea'ch revolution "of the body. .'Alter- -natively"the tt'hickness of the flange 4"n'1'ay be reduced so that the ball project's beyond-th'e- :periphery of the body and the groove 17: can

' f and the housingpfor the inner'end of the thenzbe omitted- "if i In the modification illustrated in Figure 3,tw o -balls 1, 1 are freely mounted'in oppo' site ends ofra hollow cylindrical body 18 at- .each 'end'of which is a'cur ed'inwardlyproe jecting flange 19correspo'nding to the flange 4." To permitofthefmachining of the in terior ofthe body. and of the inner-faces of the flanges 19 'the'body-ismade in'gtwo parts,

one end 20 being screwed :or forced on tothe main-part of the'body. The junctionis subsequentl y' Weldedf as shown at 2-1 to prevent parts may;

anyrisk of unscrewing, or the-two be lockedcby a'k'ey orset-pin;

For 'theinsertion and removal-of,- thef 1 a-clearance 0 ening i's-formed in the'".-side=-ofthe; body at't emiddle of its length, and is normally closed":by' a -remova-b'leplug 22.

This plug may be screwed into the opening as shown or it may'beaste'pped or'coned diametrically 'through-the-bo'dy, and its ex tremity is: screw-threaded E to Treceive fag-nut.

whichmay be aplain cylindrical hole 26.

in fi oareduce the irietionalgrip of thespring 25 on the balls and toallow them to turn freely: a pressure disc 05 ;or plate may be interposedbetwieen thejball's andthe ends of the" springs as, shown atone end of the spring inFigure'4;-

lhe trunnionbearings for the mechanisms illustratedgin- Figures 3Vand 4 are identical with thos'e"dscribed for the mechanisms illustratedin' Fi ures -1 and 2and need not be furtherfde'scribed. V f

The'incorporat-ionvof; my improved percussionimecha'nism in a chipping or like percus'sion .toolis illustratedin Figures "5 and '6.

p Themechanism-is rotatablymounted in ball PIn the mechanismillustrated:tlie ba'll at. the "outer end of" its travel does not proj'ect" with a bevel'wheel 29a driven by a flexible shaft 30 sovthatthepercussion mechanism is continuously'rotate'd. =2The bevel wheel 29 flexible shaft are located; in a subsidiary casing whichisrotatable'upon the main casing about the axis-of the-percussion mechanism so that the flexible shaft can be set at any angle tothe casingtofac'ilitate the handling ofthe tool ina-restricted space.

fAt -one point there projects through the casing and int'ofthe path of the ball or balls of; the percussionv mechanism the inner end of'a sliding-piston or plunger 3liwhich receives a blowfrom theiball or balls on each revolution r The axis of the plunger 31 is offset from-the axis ofthe percussion mechanismas shown in'F-igure 5 so that the blow is-applied'by' the ball tothe plunger in a dimotion as near-1y axial as possible. The plungenis slidably guided in a cylindrical extension 32-of the casing and the chipping or othertool 33 is slidablyguidedfin the outer endofethisf.extension,.the inner end of the tool. ab11ttingagainst-'theouter end of the plunger so that'the plunger transmits to the tool the blows received from the percussion eg a i wz-wa1; 11.,

In the percussion mechanism illustrated in Figure 5 an extremely simple construction is employed. A percussion ball 34 is freely mounted in a cylindrical recess 35 drilled radially in a solid body 36 which is secured upon a rotatable spindle 37. A hole38 is drilled diametrically through the body from the bottom of the recess to prevent the movement of the ball from being retarded byair pressure behind it.

As the body rotates the ball is thrown outwardly by centrifugal force and travels in agroove 39 of curved cross-section formed in the inner face of an annular liner 40 of hardened steel secured in the casing around the body, and the inner end of the plunger 31 Only one ball has been shown in Figure 5 but obviously two or more balls may be employed by providing a suitable number of radial recesses in the body to house the balls.

I claim 1. Centrifugal percussion mechanism for percussion tools comprising a casing, a body rotatably mounted in the casing, a stationary ring surrounding said body, an annular groove of curved cross-section in the inner face of the ring, a slidablymounted offset striker projecting through the ring, a radial cylindrical bore inthe body, and a ball member freely mounted in the bore, said ball member when thrown outwardly by centrifugal force being adapted to travel around the groove in the ring and to engage the end of the striker.

r 2. Centrifugal percussion mechanism for percussion tools comprising a casing, a rotatable body, a radial, cylindrical bore in the body, a ball member freely mounted in the bore, and an inwardly projecting flange at the outer end of the bore to form a, stop for the ball member, the inner contour of the flange conforming substantially with that of the ball, the body being provided with means for introducing the ball laterally into the bore.

3. Centrifugal percussion mechanism for percussion tools comprising a casing, a rotatable, tubular, cylindrical body, bearings for the body at right angles to its longitudinal axis, a plurality of ball members freely mounted in the tubular body, a unitary, re-. silient stop interposed between the balls in the tubular body to limit the movement of the ball members inwardly within the body, and means for introducing the balls and stop in the bore.

4. Centrifugal percussion mechanism for percussion tools comprising a casing, a robody constituting means for the insertion and removal of the ball member.

5. Centrifugal percussion mechanism for percussion tools comprising a casing, a body rotatably mounted in the casing, a radial,

cylindrical bore in the body, a ball member freely mounted in the bore, the body being provided with a stop to prevent the outward escape of the ball from the bore, and with readily removable means for permitting the removal or the insertion of the ball behind the stop, and anofl'set striker member slidably mounted in the casing and projecting into the path of the ball member.

6. Centrifugal percussion mechanism for percussion tools comprising a casing, a rotatable body, a radial, cylindrical bore in the body, aball member freely mounted in the bore, the body being provided with stops, to limit the movement of the ball member in both directions within the bore, and with readily removable means for permitting the removal or the insertion of the ball between the stops, and bearings for the body at right angles to the longitudinal axis of the bore.

7 Centrifugal percussion mechanism for percussion tools comprising a casing, a rotatable body, a radial, cylindrical bore in the body, aball member freely mounted in the bore, the body being provided with a stop to arrest the outwardmovement of the ball member and with a stop to arrest the inward movement of the, ball member towards the axis of rotation of the body, so that'the centre of gravity of the ball member cannot pass that axis, and with readily removable means for inserting the ball between the stops.

8. Centrifugal percussion mechanism for percussion tools comprising a casing, a rotatable body, a radial, cylindrical bore in the body, a ball member freely mounted in the bore, a resilient stop in the bore behind the ball member to cushion its rebound, and readily movable means for introducing the resilient means and the ball into the bore.

. In testimony whereof I affix my signature.

GEORGE HENRY THOMPSON.

Images