US1865010A - Cleansing device for rock drills - Google Patents

Description

June 28, 1932. G. w. HULSHIZER CLEANSING DEVICE FOR ROCK DRILLS Filed Aug. 50, 1929 INVENTOR. deowlshi er BY I 2 HIS ATTORNEY Patented June 28, 1932 -UNIT D STATES PATENT OFFICE GEORGE W. HULSHIZER, OF STEWARTSVILLE, NEW JERSEY, ASSIGNOR TO INGERSOEL- RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY CLEANSING DEVICE FOR BOOK DRILLS Application filed August 30, 1929. Serial No. 889,419.

This invention relatesto rock drills, but more particularly to a cleansing device for fluid actuated rock drills of the hammer type.

One object of the invention is 'toeflfect a thorough cleansing of the hole being drilled.

Another object is to control the flow of pressure fluid for this purpose by means of the hammer piston.

Still another object is to utilize a portion of the pressure fluid used for actuating the piston to augment the pressure of the cleansing liquid. I

Other objects will be in part obvious and in part pointed out hereinafter.

The figure in the accompanying drawing is a sectional elevation of a rock drill con structed in accordance with the practice of the invention.

Referring more particularly to the drawing, A designates a rock drill comprising a cylinder B and front and back heads C and D respectively. These parts form the casing of the rock drill and may be secured together in any suitable manner, as for instance, by the usual side bolts (not shown).

Within the cylinder B is a piston chamber E providedwith a reciprocatory hammer piston F having a forwardly extending stem G in which are formed flutes H to interlocking-v lyen age ribs J of a chuckK in the front head' l The chuck K is rotatable in the front head C and carries" near its forward end a chuck bushing L adapted to interlockingly engage a working implement O which extends with its rearward or shank end'P into a cavity Q'in the chuck K to receive the blows of the hammer piston F.

A suitable guideis provided for the stem G in the form of a front cylinder washer R disposed in the front end of the cylinder B.

and havinga bore S through which thestem G slides. s

In the rearward end of the cylinder Bis an enlarged bore T- to accommodate valve mechanism for distributing the pressure fluid to the ends of the piston chamber to actuate the pistonF. The valve mechanism 'comprises a valve chestU inv the form of two plates-W and X. The plate X is disposed adjacent the rearward end of the piston chamber E to form a closure therefore and the plate W issuper-imposed upon the plate X and has a Valve chamber Y wherein is disposed a distributing valve Z of the oscillatory plate type.

' From one side of the valve chamber Y to the front end of the piston chamber E leads an inlet passage 6 and the admission of pressure fluid from the valve chamber Y to the rearward end of the piston chamber E is effected through an inlet passage 0 in the plate X. Both inlet passages b and c are controlled by the valve Z, and the exhaust of pressure fluid from the piston chamber E is effected through a free exhaust port d controlled by the piston F.

Disposed in the bore T and rearwardly of the valve mechanism is the rotation mechanism whereby the chuck K and thus also the working implement 0 maybe rotated through the medium of the piston F. The rotation mechanism comprises a ratchet ring 6 which is seated on theplate W and a head 7 of a rifle bar 9 is adapted to rotate within the ratchet ring 6. The head f carries the usual spring pressed pawls h adapted for cooperation with teeth j in the ratchet ring e to effeet a step by steprotary movement of the working implement. The rifle bar 9 extends rotatably through the plates W and X and is provided with the usual flutes is to inter l ockingly engage a fluted rifle nut 0 threaded into the rearward end of the piston F.

In-addition to forming a closure for the rearward end of the cylinder B the back head D also serves as a housing for a throttle valve pof the rotary type having a central chamber 9 which maybe in constant communication with a source of pressure fluid supply. In the side of the, throttle valve p is a port 7' to register with a passage 8 in the back head D and opening into a supply reservoir t also in the back head D. Communication between the supply reservoir 25 and the valve chamber Y is afforded by supply passages u in the ratchet ring 2.

As is customary in devices of this character having rotation mechanism comprising a rifle bar, the piston F is provided with a bore o to permit the rifle bar to extend thereinto as well as such elements, as for instance a water tube to, wherewith drills of this type are usually equipped for conveying cleansing liquid into a passage w in the working imple ment.

Inasmuch that the tube to is of considerably smaller diameter than the rifle bar the bore '21 is provided with a restricted portion y of only sufficiently larger diameter than the tube '20 which it is intended to accommodate to permit the free movement of the piston F on the tube w. The restricted portion 3 of the bore 4) may then act as a guide for the forward portion of the tube to to prevent extreme vibratory movement of said tube. The opposite end of the tube 10 may be fixedly secured to the back head 1) in any convenient manner. v

' During the operation "of drills constructed in accordance with the foregoing description, aportion of the pressure fluid admitted into the forward end of the piston chamber E for driving the piston F rearwardly flows I through the flutes H in the piston stem G when said flutes are drawn into the. front end of the piston chamber. Such pressure fluid then passes into the chuck cavity Q and from thence through the passage at in the working implement and into the drill hole.

In order to assure a rapid return mover nient of the piston it is essential that the flutes ,H be not placed in communication witli the piston chamber too early during this stroke of the piston, otherwise thepressure of the fluid acting against the piston will be rest yi eh e In view of these co iderations it is there: fore obvieus that no very great amount of pressure fluid may be supplied to the drill hole through these channels. The present invention contemplates augmentingthe ordinary means fol",- flleimsing the drill hole. To his en th tu e w s provid i h eek 2 ear t orw d e s at durin the for WMd st o e o t e pist n E the. r trict POL es. o e ere l o i to t e ame ransv t plan a the e 2 o. pen com,- munication between the rearward enlarged 1-; portion of the bore a, and consequently the ea a d f e p t n. amber E, and the chuck cavity Q, V W

The neck a may be of suitable length so that pressnre fluid may flow through the re: stricted portion y of the bore throughout a considerable portion of the stroke of the pieton and the rearward end 2 of the neck a is preferably so located that it will be overrun by the corresponding end of the restricted portion y at the time or shortly after the piston F is reversed for its forward stroke. The forward end 3 of the neck a may terminate at a point where it may again be overrun by the restricted portion'y. of the bore '1) immediatelybefore the delivery of-the blow.

of the hammer piston against the working implement 0. Due to this arrangement there is formed a portion l on the tube of substantially the same diameter as the main body portion of the tube w which may cooperate with the restricted portion y of the bore '0 to assure against whipping of the tube to at the instant of delivery of the blow of the hammer piston to the working implement.

From the foregoing it will be readily apparent that in addition to the pressure fluid which escapes through the flutes H of the piston stem G during the rearward stroke of the piston a considerable volume of pressure fluid may also be admitted into the passage as of the working implement Q during each forward stroke of the piston F. In this way alternate aye o p ssure fluiden cle nsing liquid will flow through the working implement and into the drill hole to remove the u i g he e om By ably prop rtio ing the neck a and the restricted portion y of the bore 7; this desirable effect may be readil-y attained without in any way affecting the action of the hammer piston.

I claim:

1. In a fluid actuated rock drill, the combination of a cylinder and a chuck, a hollow working implement extending into the chuck, a tube in the cylinder for conveying cleansing liquid into the working implement, a neck on the tube, a hammer piston reciprocable in the cylinder, a bore in the piston comprising a restricted portion through which pressure fluid flows to the working implement when said restricted portion lies in the same transverse plane as the neck, and means on said tube adapted to be engaged by the restricted portion of the piston at the end of its forward stroke.

2. In a fluid actuated rock drill, the combination of a cylinder and a chuck, a hollow working implement extending into the chuck, a tube in the cylinder for conveying cleansing liquid into the working iinplement, a neck on the tube, a piston reciprocable in the cylinder having a bore into which pressure fluid flows from the rearward end of the cylinder, a reduced portion in thebore cooperating with the neck to provide a channel for the flow of pressure fluid from the bore to the working implement, and means on said tube adapted to be engaged by the restricted portion of the piston at the end of it s forward stroke. i i I V 3. In a fluid actuated rock drill, the combination of a cylinder and a chuck, a hollow working implement extending into the. chuck, a tube in the cylinder for conveying cleans ing liquid into the working implement, a neck near the forward extremity of the tube, a hammer piston reciprocable in the cylinder, a bore in the piston in communication with the rearward end of the cylinder to receive pressure fluid therefrom, a restricted portion in the front end of the bore cooperatin with a the neck to form a channel for the ow of pressure fluid from the bore to the channel, and an extension on said tube adjacent the neck adapted to be engaged by the restricted portion of the piston at the end of its forward stroke.

4. In a fluid actuated rock drill, a cylinder, a piston reoiprocable in the cylinder and having a bore therein through which pressure fluid flows, a working implement positioned to receive blows delivered by said piston, a fluid connection for the working implement extending through the bore of the piston, a neck on said fluid connection 7 cooperating with the bore of the piston during its forward stroke to provide passage for pressure fluid from the piston bore to the working implement, and an extension on said connection forwardly of the neck and adapted to be engaged by the bore of the piston at the end of its forward stroke to support said connection during delivery of the piston blow.

5. In a fluid actuated rock drill, a cylinder having a hollow piston reciprocable therein, a working implement positioned to receive blows delivered by said piston, a fluid conduit extending through a bore in the piston to. the working implement, said conduit having a reduced external diameter near the forward end thereof to permit passage of pressure fluid through the bore of the piston, and a portion of normal diameter forwardly of said reduced portion to coact with the piston at the moment of impact with the working implement.

In testimony whereof I have signed this specification.

GEORGE W. HULSHIZER.

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