US1535143A - Mounting for rock drills - Google Patents

Description

April 28, 1925.

R. H WILHELM MOUNTING FOR ROCK DRILLS Filed March a, 1924 INVENTOR RumflEIMbfie/m BY ms AT RNEY Patented 28, 1925.

UNITED STATES PATENT OFFICE.

RUSSELL H. VILHELM, OF EASTON, PENNSYLVANIA, ASSIGNOR TO INGERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

:NIOUNTING FOR ROCK DRILLS.

Application filed March 6, 1924.

To all whom it may concern:

Be it known that l, BUssELL H. lVILHELM, a citizen of the United States, and a resident of Easto-n, county of Northampton, and State of Pennsylvania, have invented a certain Mounting for Rock Drills, of which the following is a specification, accompanied by drawings.

This invention relates to fluid actuated percussive machines, but more particularly to a mounting for a rock drill of the hand held type, whereby the forward end portion of the machine may be supported in a new and improved manner.

It is often desirable to mount a hand held rock drill so that horizontal holes may be conveniently drilled and the operator is not hampered by the weight of the machine. These machines have been heretofore mounted in cradles, which are adapted to be moved back and forth in shells,usually by means of a manually operated feed screw. The handles of these machines have been clamped to the cradles and the forward end portionsof the machines have been secured to the cradles by separate clamps.

These clamps however have been found to be objectionable for several reasons. One objection has been that these clamps become loosened after a comparatively short period of time due to the vibration set up in the operation of the machine, and thereafter the machine is not securely held in place in the cradle, with the result that the efficient drilling of the machine is impaired. Another objection to these clamps has been their inability to withstand the hard knocks and usage to which this type of machine is ordinarily subjected and. as a result breakage often occurs. Furthermore, some rock drills do not provide sufficient space 011 their forward end portions to enable a clamp to be secured thereto. 7

One satisfactory manner of supporting the front end portion of a hand held rock drill may be obtained by forming a T- shaped projection on the front head of the rock drill, which is guided in guide-ways formed on a cradle. By this means, clamps which have been heretofore used, have been eliminated and an efficient construction produced which is cheap to manufacture, and by which the number of parts on the machine has been reduced.

Serial No. 697,206.

Whenever the rock drill is detached from the mounting, this projectlon is still useful. Heretofore, whenever horizontal holes close to the ground have been drilled by hand 1 must be replaced by a new one or the lugv will wear to such a point that the weight of the rock drill will be supported on the steel retainer with the added disadvantage of weakening this part. By means of an integrally formed projection; formed on the.

front head the machine may be used for drilling horizontal holes close to the ground and guided and supported upon this proj ection so that the life of the front head will be considerably prolonged.

The object of the present invention is to overcome the above mentioned difficulties and to enable a front end portion of a hand held rock drill to be mounted in a new and improved manner.

Another object of the invention is to pro duce an improved connection between a front end portion of a hand held rock drill and the mounting therefor.

Further objects of the invention will hereinafter appear and the invention is shown in one of its preferred forms in the accompanying drawings, in which Figure 1 is aside elevational view of a mounted rock drill of the hand held type, some of the parts being broken away,

Figure 2 is a transverse sectional view taken on the line 22 of Figure 1, looking 'in the direction of the arrows, and

Figure 3 is a perspective view of the front head of a rock drill shown in Figures 1 and 2.

Referring to the drawings, A. designates a shell which is formed with internal guide ways B in which the guides C of a cradle D are adapted to extend. The shell A is preferably formed with a cone E to enable the shell to be swivelly mounted on a suitable support. A feed screw F is in engagement with the cradle D adjacent to the rearward end portion of the cradle and is secured to a plate G at one end of the shell A. The

plate G is preferably secured to a lug H on the shell A by the bolts J and nuts K. The feed screw F may be provided with a suitable handle (not shown) to enable the cradle D to be moved back and forth in the guideways B of the shell A.

A lug L is in this instance formed in the cradle D and is preferably formed with a V-shaped notch O which is adapted to receive the handle P of a fluid actuated percussive machine Q, of the hand held type. The fluid actuated percussive 'machine Q in this instance comprises a cylinder or body portion R having .a back head S to which is connected the handle P by means of the spring pressed side bolts T. The front head U is also secured to the cylinder R by the spring pressed side bolts T and is'adapted to receive the working implement V in this instance in the form of a drill steel which is preferably held in the front head U "by the steel retainer WV. The steel retainer 7 is in this instance pivotal'ly connected to the trunnions 3V carried 011 the opposite sides .of the front head U. A valve chest X is secured to the cylinder R by the bolts Y and nuts Z and a suitable distributing valve is located in the valve chest for "distributing the .motive fluid to a hammer piston a which is adapted .to reciprocate in the cylinder R for delivering impact blows to the drill steel V.

In accordance with the present invention, the front head U is preferably formed with an integral T-shaped projection Z) at one side of its forward end. The T-shaped projection b is adapted to extend into the guideway 6 of the cradle D and have limited longitudinal movement therein, but is prevented from moving in a vertical plane by the guide-ways c. lVhen it is desired to use the rock drill Q for drilling horizontal holes close to the ground,'the machine may be removed from the cradle D and the T- shaped projection I) will support the machine in this position and prevent wear from occuring on the steel retainer lV or other front end parts of the machine.

In order to hold the handle P in the V-shaped notch O, a clamping plate 7 is adapted to bear against the handle P and a bolt 9 extends through the plate and lag L and a coil spring It is preferably located between the lug L and a nut which is screwed onto the end of the bolt g. In this manner, whenever the piston a strikes against the front head U the force of the blow will be absorbed by the coil spring 7t and the rock drill Q will be permitted to move "longitudinally for a slightdistance.

tion of a front end portion of the machine,

means formed integrally with said front end portion for supporting said POIf/IOII, a

carriage on which said machine is mounted, said carriage being for-med with guide-ways adapted to receive said integrally formed means and to permit said front end portion to slide in the longitudinal plane of the machine butprevent movement "in the vertical plane of the machine, means for clamping a rear end portion of the "machine to said parriage adapted to permit limited longitudinal movement of the machine relative to said carriage, and a shell on which saidcarria-ge is mounted. V

2. A mounting fora fluid actuated percussive machine comprising the combination of the front head of the machine, a carriage for said machine having guideavays, a clamp for a rear end portion of the machine adapted to permit limited longitudinal movement of the machine relative to said carriage, and a 'T-shaped projection provided on one side of the front head adapted to extend into the guide-ways of said carriage, whereby the front head is permitted to move in the longitudinal plane of the machine but is prevented from moving in the vertical plane of the machine.

3. A. mounting for a :fiuid actuated per cussive machine comprising the combination of the front head of the machine, a carriage for said machine, cooperative aretaining means formed on said front head and carriage adapted to permit movement of said front head relative 'to said carriage in the longitudinal plane of the machine but prevent movement in the vertical plane of the machine, means for clamping a rear end portion of the machine to said carriage adapted to permit a limited longitudinal movement of the machine relative .to said carriage, a shell for said carriage,.and means for moving said carriage relative :to iSZlld shell.

In testimony whereof I have signed this specification.

RUSSELL H. WILHELM.

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