US1623411A - Friction head for rifle bars - Google Patents

Description

April 5, 1927. 1,623,411

G. w. HULSHlZER FRICTION HEAD FOR RIFLE BARS Filed Sgpt. is, 1925 E (7 #1 1 g 1 f 11 42 Y M- Y 1 INVEN TOR.

Patented Apr. 5, 19 27.

' Nir p j GEORGE w. HULSHIZER, or sTEWARTsvILLn, iinw annsny nssrelvon 'roinennsonn RAND COMPANY, or JERSEY CITY, new JERSEY, A CORPORATION OF NEW JERSEY. 1

mama :HEAD'FOR RIFLE Bans] ,Application filed September 16,1925; Serial No. 56,567. t

i :Q This invention relates to rock drills, but

' more particularly to a device for imparting rotative movement to the drill steel of a 'fluid actuated rock- ,drill of the hammer Hyp -P I V .Oneobject of the inventionjis'to hold the rifle :bar of a rock drill immovable so that the hammer piston and the associated rota- .jtive elements will describe a partial revolu- 1o jti'onwhenthe piston travels' in one direcf 7 f'jtionl andtoinsure'instant and positive re tijonsf of elements, features of, construction, I 25 and arrangement of parts havln'g the general model of o eration substantially as herein-.

' after described andmoreparticularly pointlfledjout in the appended claims and illuslfltratedflin the accompanying, drawings, in 36 'which\'j, j i w 'Figure 1 is a longitudinal sectional ele- 'vation of a rock drill showing the friction I ,head "in releasingposition, and

1 Eigurefljisfa view similar sho'wingthe friction head in engaging posi- V tion with the friction ring; I v r r Referring to'the drawings, the invention is shown embodied in a rock drill having acylinderl A,a front head B and back fhead C,

40' which partsform the'outer casing for the rock-drill and are held in operativenposition y by the; usual side bolts -(not shown). The fcyl'inderA is provided with apiston D havfinga'forward fluted extension E which col,operatesj slidably with a correspondingly fluted chuck nut F in the front end of the cylinder A, The chuck nut F is arranged ro- ""tatably" within the cylinder and has at one end clutch teeth G which cooperate with p'artfJ to prevent relative rotation between said chuck nut and chuck'part J. Frequentqfizist seeige eqo d' chuc Par K is emp oy .Vfland; W leading from the rear andfr'ont to Figure 1 similar clutch teeth H formed on a chuck :.erabl y "somewhatsmaller than tlle biore cl so .ith twh n gcsaid h dzis n the re leaaiesir and is arranged in the front 'endof the front headB to receive a drill steel L and has interlocking teeth 0 which engageisimilar teeth P formed on the forward end of the chuck part J to prevent relativeiirotation between the chuck parts. The chuck part J also serves as; a seat for an anvilblockQiarranged slidably therein to transmit the blows of the hammer piston D to the drill steeliLi Pressure fluid for actuating gthej hainmer j piston D and other associated partsrad mitted into the drill througha,suitable connection R secured to the valve chest S and is controlled by a' suitable throttle 'valvelnot shown) having a throttle lever T." The dis- 7 tribution of the pressure fluid may be con trolled by any suitable valve. In this instance a flipper valve U is indicated l f The flipper valve U controls the admission ports ends ofthe valve chest' S to the'corre sponding'ends of the cylinder Theexhaustof pressure'fluid from the'cylinder A is effected through a free exhaustpiort Xc'om. trolled by the pistonZD; p v if, c,

In order 'to impart rotative movement to the piston D' andassociated rotative' parts, a fluted rifle bar.Yi cooperates with grooves Z formedin, the pistonto prevent relative rotation between said piston and saidrifle bar. wback cylinder washerfbforms a cover f'orthe rear endof the cylinder A and also 'serves to centralize the rifle barfYQ Although the rifle bar is shown flutedlit'fis'to be understood that anyfsuitable form offbar may be used which will prevent relative rotative movement between the bar- Yand the piston, and which will causethepiston to describe a partial revolution during one-:01" the other of its strokes.

In accordance withthe present inventiona friction ring 0 is arranged intthelb ack'fhead C and has a tapered borecZJ Thejfriction ring 0 may besecured in position in any suiable manner, as i for instance, a, dowel joins, a key, or press fitted as indicated in. the. dr wi rearward part of the friction ring-c and communicates with" the rearw ard end of the ii?- cylinder A 'througha passage The rifle bar Yicarries at its rearmo'st end a friction head 9 tapered'to correspond with the taper of the friction ring 0., Thehead g is-preftfizarn EH 1? i A chamber e is" formed in the" H t" Wardly ofrtheplungers 2. haustedto atmosphere jthrough. the ports j V sition -shown in; Figure 1, a slight space It eicists between the periphery of said head and the'bo're cZ. Communication :between o v *saiid spac'e h-and'theatmosphereuisprovided I flw5 by a-port j ,fo'rmed in the .frictionl ;ring 0,

*a passage is in the'back head C, and a port extending from the passagekrto the 8X1 terior. of the hack head ,0. In this instance the chamber 6'i1S' also"in'commuii cation 'O with the port 0.through a small .port or vent,

V p iormed in the rearward end of the-fr ction f ,ringc toprovide for theescapeo fair com pressed'iby the piston during its rearward ,.,Stroke.,

v i. {Betheendytha'ttheflhead g cofitherifiehar nay be:automaticallyiorced into engagev .me t with .theltaperedlboreicl {of the fricti ring 0, a plurality {of .plungers gar-e; arranged i 1-slidahlyin hores ,4 and Joe/arm .Qne' end ge ns .the hack cylinder 2 Springsls are' arranged 'inthe'hore T1631- fers loiitwardly against .t e cylinder :WaShQ ixflhgoperation of the device is .as follows In ,the p sition 01 the par s shown an Fig- 1 nre.=l', arportioniofithelpressure ,fiuid iiIithe rearward end ofthe .ycylinder- A will pass;

through; the passage fintothe .chamher'e and act against the rearward surface of the ,head ,9; In thisflvvay the head ig will: be forced doWmvardlyor forwardlyagainst the :backrcylinderwasher bkas shown 1111 Figure v l 1. It'iwill be seen that when therhead gkis in this position, it' is'outcof' enghge'mentwith .3; ,thebore dendiewiieiad 9 togeth r i the .rifle'bar mayqthen desoribe a partialrevolu i Q ,tion ,as'the' piston Dadvanceson its forward stroke; ,VVhilethe friction head ig .isJoeing held free .from the tric'tion ring e, ,aeportion 10f the, pressure fluid in the chamber 6 isexy an d p, the passage 7:: and the ,port 0 toimmediatelylreduce the ,pressureacting against ithe headfg below line pressure; After .the

i ,pisftonjl) uncovers the free exhaust ;port X,'

'the,pressure fluid remaining in the chamber. 3 '0 will beiexhausted through the passage or 1-, passages ,f, t ro gh the cylind 7 A n ls main'exhaust port ,X- to}the atmosphere as well as through lthepassages leedingdirectly 'i{,fromthechambereto the atmosphere.

; S iinultaneously Withlthe exhaust of the pressure :fluid gfromwthe chamber .16 .ihe springs s illuforce-the .head ,9 into engageent with :the tapered h r-ed i o t fricti n ring When' the p is to n starts on its rear w rd lstroke, aJSl gh-t iturningv -motion isi -v it partedto the riflefhar which causesthehead g g to more firmly engage vthe tapered ,hore d. zBy t usgho fcling he rifi'eibara ta i na y the ;;pi5ton 1) during its rearward stroke will. .move in yaspira l {direction about {the jrifiecbar ,andsince the pistoniand the.ch c ..pa s 1 are ;inter 0cked against ;I?ela'tive irotative 'movement', the drill steelL is rotated tofa' {blow of the piston.

Washer 12. V

to hold said 'plungv different "cutting position for the succeeding The foregoingdescribed device has been found .to he unusually .eflicient in operation and possesses the desira hle iadvantage of permitting the head 9 to slip Within the tapered bore d When the drill steel becomes In such case the stuckin the drill hole. drill maybe slightly Withdravvn'and the piston illmaycontinue to reciprocateuntil the i -drilllsteelL hasbecome loosened'in the hole.

After the drill steel L'isaga'in freeto rotate, the .dl ll in y be advanced an th ri t o heady and other parts comprising the rota- :tive.ele ment Will again function in their normal manner. of this inventionfis that the ear Which'in An ther desira le advantag 7 [the ordinary rifle .bar head and associated par is usually 0 11131 41 to .a few rath r small wearing surfaces, may he.o f mem- ,para-tiv yllalgge ar a'so .thatzt e li e Qfthes parts may render a long period of service as compared ras er. v

.1 Claim? Y or 1. In ,fluid actuatedfrock drill, theQCQmhination' of a cylinder, a; reciprocating ham rmer ,pistonin the cylinder, aihack'head for the cylinder, a friction ringsecured fixedly in the hack head. and having 'aytap'ered bore, a friction head rotatahlefllid IOIigitHdin'ally ,movahlein' the friction ring, a riflegbar carried ,hy the ffrictionhead and extending slidivith the usual devices of this char- (ably intothe hamlIlQr pistomspring pressed :p1ungers{.i11 :the friction head adapted to ,hear continuously upon some ;non .ro'tatable element ol the drill for-moving said head into frictional engagement with the tapered bore in order to hold the rifle barfaga'inst r ta i n during -rearwa d s roke Tof the piston, a pressure. chamber communication 'With' the cylinder ,to, ,receiVe pressure fluid .iforactuating the friction head (out of engagemen f o t e riction ring When-t e hammer piston starts gon'its forward stroke, and ,a ,passage n the ifriotionrlng t0 estab- .lish communication .loe't-Ween the tapered bore and ,the atmosphere for preventing air compressed hywthe piston ffromlunseating the friction head.

friction :head hearing against :the cylinder hack head and adaptdtomove thesaid fric.-' tmn head m e hgagem n wit t t per d bore for holding the rifle bar against'rotation during the rearward stroke of the piscommunication between the tapered bore I ton, and a pressure chamber in the friction and the atmosphere for reventing air comring communicating with the cylinder to repressed 'by the piston rorn unseating the 10 ceive pressure fluid for holding the frietlon friction head; 7

5 head free in the friction ring during the In testimony whereof I have signed this forward stroke of the hammer piston, and specification. a passage inthe friction ring to establish GEORGE W. HULSHIZER.

Images