US1590268A - Handle for rock drills - Google Patents

Description

4Jung 29, 192s.. 1,590,268

` G. G. TUTTLE HANDLE FOR BOOK DRILLS Original Filed March 5, 1923 @i INVENTOR.

Patented June 29, 1926.

UNITED STATES PATENT orties.-

GROVER G. TU'TTLE, OF PHILLIPSBURG, NEW JERSEY, ASSIGNOR TO INGERSGLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A. CORPORATION OF NEW JERSEY.

HANDLE FOR ROCK DRILLS.

originan application filed March 5, 1923, sei-iai No. 622,748. Divided and this application inea oetober 1s, 1924. serial No. 744,462. 1

rlhis invention relates to fluid pressure operated rock drills of the hammer type, but more particularly to air feed control for the feeding element of'a stope drill.

This application is a division of applicants copending application, Serial` No. 622,748, tiled March 5, 1923.

.Stops drills are usually provided with a laterally extending handle which the operator turns to provide rotation for the steel. In the case of self rotating tools, this handle is used for the purpose of holding the drill from rotating'while the steel is turned in the rock. For maintaining the steel vagainst the work, there is ordinarily provided an air feed supplied with' motive fluid from the main source for the throttle or other controlling valve for the drill so 'that when the piston of the drill is operating, air is simultaneously being fed to the air feed cylinder. It is a common occurrence for the drill steel to stiel; in the hole while drilling and the most t convenient way of loosening the steel is to continue operation r of the hammer piston in the drill cylinder,

and at the saine time to release the pressure in the air feed cylinder allowing the steel to be withdrawn somewhat. Almost unvoluntarily7 the operator pulls down on the rotation handle when the drill sticks sensing that the steel must be withdrawn from the hole in order to continue drilling. Under these conditions, it is very inconvenient for the operator to operate the throttle valve because it is the usual practice to arrange the throttle valve so that the drill stops hammering before the air feed is relieved.

It is an object of this invention to provide an air feed release `which is controlled by the unconscious action of the operator in pulling down on the rotation handle when the sticking occurs. V

Further objects of the invention will ap pear from the following description taken in conjunction with the accompanying drawings, in which- Figure l is a side elevation partly in vertical section of a stope drill embodying the invention7 Figure 2 is an enlarged detailed view in longitudinal section of a portion of the rotation handle shown in Figure l wherein the grip supported by the handle extends downwardly, and

Figure 3 is a detailed view in longitudinal section of a rotation handle reversed so that the grip extendsupwardly but still operates to release the air feed when the grip is pulled downwardly. Y Referring tofthe drawing, a stope drill is illustrated iny Figure l having the usual cylinder A and front head B carrying the drill steel C. The front head B is attached to thecylinder A bythe usual side bolts D and the cushion springs E. The cylinder A and its operative parts comprise the percussive ele1nent`(not shown) of the tool for imparting the impact blows ofthe pistonto the drill Isteel C. The drill steel may be rotatedv in any suitable manner, but in this instance is adapted to be rotated by a gear niotor (not s own) enclosed by the gear cas-V ing F.

The feeding element comprises the usual feed cylinder Gin which theipiston His adapted to slide. The piston rod J, which carries the rock engaging pointer K, is' secured to the piston `H. Between the gear casing F and the feed cylinder G is located the head block L to which is secured a laterally extending rotation handle'O whereby the `operator may hold the machine against vrotation with thel drill steel C. In this instance, the handle O is provided'with a portion'O extending at right angles either up or down as vshownin Figure l. `Motive fluid for operating the tool is 'supplied through the inlet L and simultaneous admission of motive fluid to the cylinders Gr and A is controlled by a suitable throttle valve (not shown) having a valve handle P. The portion O of the rotation handle O is provided with a sleeve or grip Q, which is rotatable for the convenience of the operator and is adapted to slide vertically on the portion O being held against removal by the cap R. The grip Q. is preferably providv ed with end flanges Q to prevent slipping -of the operatorls hand from the grip. ln sliding up and down, the grip Q is adapted to open or close as the case may be, the valve S reciprocable transversely through the portion O for controlling a passage way T leading from the air feed cylinder Gr to atmosphere, preferably through a bore in the cap R. To this end the portion O ofthe rotation handle is provided with a transverse bore V and a counter bore lV. The valve S is adapted to seat at the junction of the bore V and the counter bore W and is provided with a head X adapted toL oe pushed inwardly by the cani like action of a spherical groove Y on the inside oi' the grip,

Normally,'the valve S vis heldfclosed by means of a suitable spring S pressing hetween the body Z ot the valve S and a hollow screw o vthreaded in the counter hoi'e W.

The grip is; normally held'up hy a/ coil spring c. rihe coil spring o encirclesfthe'free end of the portion Q land in this instance hears with oneend-against the grip Q andl at itsother end isfseat'edf on the cap R, so that in order to open the 'valve S thel grip Q must he pulled downwardly. Rotation of the grip' Q does not' aiieot the valve S since the groove Y is of an annular form. d

`Villen the grip `Q is ,pulled down, the

`groove Y pushing against the head X of the `Valve :Si 'the 'air `-tloh the Cylinder G '1S than Permitted lk Oti'tthlghtle passage T past the va-ive' S into the 'hre V and thence through a passage d .to atmosphere. The

from therotation handleO as Vshown in Fig` ure 2 or upwardly as shown inFigure 3. The operation of the handle will loe the same, it being merely necessary if this change is desired to remove the'ca'p `R and reverse the grip Q with the springe on the angularly entend/ing portion O.

l. A rock drill comprising a pressure fluid feeding element, a hollow laterally extendingl rotation handle in communication with the feeding element and having a vertically eX- tending portion, a. longitudinally slidahle grip having end flanges and adapted to rotate on said portion, an internal spherical groove" 1n' said grip, a springencircling the free end of saidy portion normally holding vsaid grip upwardly, and' a. 'valve' in said portion contacting with therspherical groove and operable 'by thejdownward motion oi" said grip "with respect toY said portion to control the pressure fluid in said feeding 'element through said hollow handle and throuoh the ortion to thev atmosphere.

l 9,.' rockt rill'comprising a pressure fluid feeding element, a hollow laterally eX- vteiiding rotation handle in communication with the feeding element and having a verticallyrextending portion, a 'longitudinally Vslidahle grip having end flanges and adapted to` rotate on said portion, an internalspherical 'groove in said grip, a spring encircling the free end of said portion 'normally holding vsaid grip upwardly, a valve reciprocahle transversely through 'the' portion' constantly contacting with the spherical groove and 'adapted 'to be opened :by said groove upon downward movement of the grip on'the portion for releasing pressure 4fluid from the Vfeeding element through thehollow handle andthe portion to the atmosphere, and a cap inthe yfree end; of the portion to form a `seat for the spring and for preventing removal of the grip from the rportion'.

y Intestin'iony 'whereof I have signed this specification.

GaovER G, TUTT'LE.

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