US1414234A - Drill-steel retainer - Google Patents

Description

G. GLufLE. DRILL STEEL RETAINLR.- APLLICATION'HLED Aue.13,19'2p .r

xffpgemed-irf 25, 1922 A v2SHEETS-SHEET1.

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G. G. TUTTLE.

DRILL STEEL RETAINER. APPLICATION FILED AUG. I3, 1920.

Patented Apr. 25, 1922'.

2 SHEETS-SHEET 2.

' INVENTOR' v wpmwfmj.

/ ATT'o NEY vUNurliD STATES-PATENT. OFFICE..

GROVER GOODRICH TU TTLE, 0F PHILLIPSBURG, NEW JERSEY, ASSIGNOR TO ING-ER- SOLL-RAND COMPANY, O JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.'

DRILL-STEEL RETAINER.

embraces the drill steel and is suitably held or clamped in-position upon the front' head of the machine. f

Such yoke retainers are subjected to severe impact as the colla-r on the drillsteel strikes the yoke and various devices have been employed to` cushion or yieldingly hold the yoke to avoid breakage of the parts, some of these devicesV inclu-ding bolts and springs,4

but the breakage is diflicult to overcome, and the more complex the parts, 'the greater the danger of breakage becomes.'

The primary objects of the present invena citizen of the United States, and

tion are to simplify the retainer 'construction, and reduce the chances of breakage by avoiding the use of retainer bolts and supporting the yoke retainer from the front head of the machine by means of an arrangement of main and supplementary springs which cushion the yoke in both directions.

Another ob]- ect of the invention is to supplement the expansive force of the `main springs in holding the retainer, by means of fluid under pressure, which may loe the live pressure taken from'the supply 'inlet sure fails for any reason, the main retainer of the machine. In such case, if the pressprings still fulfill vthe function of exerting pressure tov cushion the yoke.

To these ends the invention is shown in its preferred form in the accompanying draw ings, in which Figure l vis a side elevation of the front head of a rock drill having my drill steel retainer applied thereto, a portion of the wall of one of the spring holding guides beingvshown broken away,

igure of the front head on the line 2-2 of Figure 3 4looking in the direction of the arrows, 'i

2 is a vertical sectional elevation` i Specification of Letters Patent.. Patented Apr.' 25, 1922. Application filed August 1'3, 1920. SerialNo. 403,250. l

Figure 4 is a vertical sectional elevation of a front head showing a modified form of the drill steel retainer,

Figure 5 is a detail view partly in section showing one form of bearing block for the ends of the yoke,

Figure 6 is a similar detail view showing another form of bearing block, and Flgure 7 is a detail perspective view showing a bearing block for the en ds of the yoke in the form of a cylinder.

.Referring to the drawings, A represents the front head of a rock drill having the nose piece B, adapted to receive the front head bushing C through which thedrill steel D having the collar E, is adapted to extend in position to receivethe impact blows of the hammer. The front head is provided with the usual lugs F through' which the side bolts G extend for clamping the cylinder and front head together.- In this instance the front end' portion H of the cylinder casing is shown partly broken away-t0 indicate the relation of the parts.

In accordance with my invention the fronthead 4is provided with spring seats J at opposite sides of the lvmachine and main coiled springs K are supported on said' seats. Spring holding guides L preferably in -the form of sockets are also provided on the front head in longitudinal alignment with the seats J and supplementaryl coiled springs O, which may be lighter than the'main coiled springs K, are arranged in said guides L. The outer walls o'fv the springholding guides L are slotted as shown at P and a yoke retainer Q, bent at the vportion R to embracev the drill steel, is provided with arms S having hook shaped ends T supported between the said sets of springs K and O so that the yoke retainer is cushioned in both directions. The

bent ends T of theyoke are slidable in the slots P in the spring'vholding guides,and

bearing caps U are preferably providedover the opposed ends of the springs K and O- so that the bent, ends T of thefy'l're are' held between the said bearing 4caps instead of dil rectly against the springs in order to avoid wear on the springs-and aid in centering the yoke.

Figure 3 is la top plan view of the front?.

head with the "drill casing and front head bushing removed, A

removed from the machine and themain In assembling the parts theffront head. is

coiled 'springs K are irst inserted through the open ends of the spring landing-.guides and placed onthe seats J with the bearing caps U 'on the springs. The yoke retainer is then placed in position in the slots P and 44apertures in the spring holding guides and from the supply'inletof the inachine'andif form covers .to hold the s rines and voke in position. The yoke is maintained inoperative position, as'indicated iii r'ull lines in -Figure l by means ot' the depressions lV in the faces ot' tkhe spiiiig seats J and the yoke may be swung into the 'position indicated in dotted lines in Figui-el, for' removal of the drill steel when desired. It desired, oiling apertures X nay be provided in the walls of the spring seats J so that fby oiling.the seats oil will reach the contact 'laces' between the arms of the yoke and the depressions lV in the springl seats.

In the operation of the device it will .be observed that the main coiledsprings K take the shock of the impact ot' the collar E ot' the drill steel upon the yoke and cushion the blow in that direction. The supplementary springs cushion Ithe yoke in the opposite direction and obviously need not be as'strong as the main coiled springs K. By my coi'istruction I avoid the use.ot` retainer bolts and fastening devices therefor, and depend upon the springs for cushioning the yoke, but I guide the yoke and springs in the spring'hdldingI guides and on the spring seats in a simpleand efficient manner which avoids breakage both of the springs and the yoke.

In the modification shown in Figure 4, the

walls Y ofthe spring seats J are lengthened and in this instance t'orm continuations of the outer walls of the spring holding guides L. Somewhat lighter main coiled springs` K aresliown seated on 'the spring seats J and bearing caps in the form of thimbles Z are placed over the main coiled springsit` and extend within the vwalls'of the spring seats.

seats and the bearing thimblesv Z in order toy supplement the expansive 'force ot the liuid under pressure. may be supplied. This fluid under pressure may be the live pressure the luidpressurefails the springs K still fulfill their function ofcushioning the yoke.`

The uidpressure maintained within" the bearing thimbles Z supplements the spring pressure, enables lighter springs to be used and aids in preventing breakage oi" the springs and breakage of the yoke.` It clesired,4the chambers within" the spring seats The object of this construction is to; permit fluid under pressure -to be supplied to ,the telescopiccliainbers formed bythe springl J may be filled with oil or grease to further aid the cushioning ot' the yoke land prevent breakage of the springs.

In the modification shown iii Figure 5, a bearing block c in the form ot' a ball having a square. hole (l is shown adapted to vtit over the square bent end e of the yoke arm S,

in this instance the yoke being formed of square stock instead of round stock.v The bearing plug or ball c is preferably provided with a flat surface j' adapted to b ear on one or' the bearing blocks U oi to bear upon the bearing thiinble Z. It desired the face g ot' the bent end e of the yoke could be riveted or otherwise rigidly secured in the bearing plug o. In using a yoke with bearing'plugs 0 at each end, the bearing caps U for the supplementary springs O maybe dispensed with if desired.

In the modification shown in Figure G'the the yoke arm S which in this instance is shown formed of round stock.

I claim: l. A drill steel retainer for rock drills,

comprising springseats 'rigidly connected to l opposite sides o1E the front headof the machine, main coiled springs supported on said seats, spring holding guidesin the form of sockets on the iront headin longitudinal alignment with the saidigseats, supplementary coiled springs arranged withinfs'aid sockets, and a yoke 'retainer for the 'drill steel having the ends of its,v arms extending through the socketsan'd supported between 'said sets of springsfand leuslrionedn bothffdirections, wherebyf'the said main lcoiled theyoke retainenlf) lgdrill steel f' retainer springstake theshock of impact .ofthe steel lier', rock drills comprising spring'seats at'fpposite sides of ztghetrontheadof the machine,1 ma1n coiled ,springs `supported on sai d seats," spring holding guidesin the` forrr of'isockets on the .front head in longitudinal*alignment with the said seats, said guides having longitudinal slots in their outer walls," supplementary f coiled springs arranged insaidf guides, and a yoke retainer for the drill steeihaving the ends of its arms slidably-siipported iny said guide slots between said sets of springs and thereby cushioned in both directions.

3. A drill steel retainer for rockdrills,

comprising spring holding guides and spring seats in longitudinal alignmentat opposite sides of the front head of the machine, main coiled springs on said seats, supplementary coiled springs in said guides, bearing caps4 over the opposed ends of said springs, and a oke retainer for the drill steelA having the ends of its arms supported between said sets of bearing caps and thereby cushioned by the springs in both directions.

4. I A drill steel retainer for rock drills comprising springholding guides and spring seats in longitudinal alignment at opposite sides ofthe front headof the machine, main coiled springs on said seats, supplementary .coiled springs in said guides, bearing caps in the form of thimbles arranged over the ends of the said main coiled springs and eX- tending within the walls of thespring seats,

a yoke supported between said sets of springs, and means for maintaining fluid pressure within said bearing thimble to supplement the expansive force of the main coiled springs.

5. A drill steel retainer for rock drills comprising spring holding guides and spring seats in longitudinal alignment at opposite sides of the front head of the machine, main coiled springs on said seats, supplementary coiled..springg in said guides, bearing caps in the form of thimbles arranged over the ends of the said main coiled springs and eX- tending within thewallsof the spring seats,

bearing caps over the ends of the supplementarysprings, a yoke retainer for the drill steel having the ends of its arms supported between said sets of bearing caps, and means vfor maintaining fluid pressure within said bearing thimbles to supplement the eXpan-` sive force of the main coiled springs. A l

46. A drill steel retainer for rocl drills, comprising spring holding guides and spring -seats at opposite sides of the front head of..

the machine, coiled springs in said guides and on said seats, and a yoke retainer for the drill steel having the ends of its arms` provided with bearing blocks Supported between saidsets of springs whereby tlie yoke retainer is cushioned in both directions.

' 7. A drill steel retainer for rock drills,

comprising spring seats at opposite sides of the front head` of the machine, main coiled springs supported on said seats, spring holding guides in the form of sockets on the front head in longitudinal alignment with @par tary coiled springs in said sockets, the main i coiled springs being supported on said seats, a yoke retainer for the drill steel having the ends of its arms supported between said sets of main and supplementary springs 'and cushioned in both directions, and means for maintaining iuid pressure within said sockets to supplement the expansive force of the main coiled springs.

9. A drill steel retainer for rock drills comprising spring holding guiding sockets and spring seats at opposite sides of the front head of the machine, coiled springs in said sockets and on said seats, a yoke retainer for4 the drill steel having the ends of pressure within said sockets to supplement the expansive force ofthe springs.

lO. A drill steel retainer for rock drills, comprising coiled springs mounted ony thefront head of the machine, a yoke retainer for the drill steel having the ends of its arms cushioned by said springsfand fluid pressure means exerting pressure on said yoke arms for supplementing the expansive force of said cushioning springs.

l1. A drill steel retainer for rock drills, comprising a retaining member for the drill steel and means 4for mechanically and pneumatically cushioning said retaining member. 12. Adrill steel retainer for rock drills,

its 'arms Vsupported and cushioned on said springs, and means for maintaining iiuid comprising a retaining member for the drill steel supported from the front head of the machine, and devices for mechanically cushioning said retaining member including additional pneumatic means supplementing the said mechanical cushioning devices.

In-'testimony whereof I have signed this specification. y

i GROVER GOODRICH`TUT-TLE.

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