US1221469A - Rock machine-drill for operating with flushing-water. - Google Patents

Description

-R. MEYER ROCK MACHINE DRILL FOR OPERATING WITH FLUSHING WATER.

APPLICATION FILED JUNE 5, 1912.

R 1 4 6 Patented Apr. 3, 1917.

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Known rock machine-drills operating by percussion and with flushing water, in which I drills the flushing Water is introduced into the bore through the hollow drill either alone or with the aid of the compressed air operating the piston, have fundamental disadvantages. Inthe maohine-drills into whose bores the flushing water is introduced under pressure, from the rear or from the side of the '25 through the drill and its outlet by. means of compressed air. In known machines of. this kind which flush with the aid of the coinpressed air already in the cylinder the pressure operating the drill is so variable that the flushing is not always satisfactory and a leakage of the flushing water into the machine cannot with certainty be avoided.

A primary object of my invention is to ob-v viate these defects, and consequently arrange that a pressure, which operates continuously is produced behind the drill by means of compressed air which is introduced independently of that required for the piston; so that the flushing water is always driven at the required velocity through the drill and a leakage of the same into the machine is avoided. The compressed air thus aiding the flushing water is preferably introduced irour'the' rear end of the machinemnd by means of a pipe concentric with/{the flushing water pipe and kept airtight tlici'ctrom. The bore of the piston can be made of such a size that the compressed air aiding the flushing water, in the event of a larger pressure injurious to the action oi" the machine arising, ran insin po through the piston and pass out through an. exhaust port.

Specification of Letters Yetent.

appliance, the parts wheroat the water enters Patentedflpr. 3, $911.?

lhe air supply for the oscillation of the piston can consequently be kept quite independent"throughout by providing the pis ton, as is already known in steam engines, with a rear piston rod, which goes through the cylinder cover and is made suitably airtight thereat. j i

The compressed air-flowing in the direc tion oftlie stream of water gives, owing to its kinetic energy, an eiiectual impulse to the flushing water in the direction of the pipe. In order to prevent a. leakage of the flushing water into the machine the pipe oonreymg the former to the bore in the drill extends beyond the air pipe. There then obtains in the space nto which both pipes PLOJGCi a zone, beh1nd the place where the water issues, which continually remains under air pressure and which prevents a leakage of the flushing water into the ma chine. The ends of the pipes can be formed like nozzles in order to accentuate the ac tion in the direction of the drill.

'lwo illustrative embodiments of my iii-- vention are represented. by way of example in the accompanying drawing wherein:

Figure lis a longitudinal section of the machine portion of the first form of flushing device, which in no way aiticcts the distribution of the compressed air used in the interior of the machine or "forms a connec cylinder. and

Fig. 2 is a similar longitudinal section of i the second form, in which the double feed pipes are used in a percussion machine-drill of normal construction.

Referrin to the first form shown in Fig. 1 the piston]; which is moved to and fro in the working cylinder (4 by the driving agent, for example compressed air, is provided in known manner with a piston-rod c, which gives the percussion blows to the projecting end a on the drill. The other side of the piston is provided with a rod d which passes through the cylinder cover f and is rendered air-tight thercat. The cover f has a cylindrical projection a into whose end It two pipes i, k, the one fitting into the other with tight at their bearing places so that there can be no connection between the chambers A, B, O. The piston is provided with a bore Z, throughout its length, which bore is of such a size that the pipe is passing through this bore does not come into contact with the, same. The front ends of the pipes L, 5 fit with play into the bore m of a drill arranged in known manner in the machine. The inner pipe 71 preferably extends somewhat beyond the pipe is. The remainder of the machine is so arranged that the inwardly projecting end 6 of the drill when returning toward the interior of the machine cannot come into contact with the ends of the pipes 2', 7c. In drills having a small bore the introduetion of these pipes is facilitated by widening out the entrance to the bore as shown in Fig. 1 The flushing device operates in the followingvmanner. The pressure Water is introduced into the chamber B and flows through the inner-pipe a into the bore m of the drill. The agent, e. 9., compressed air, for operating on the flushing water, is introduced into the chamber A preferably with an undiminished pressure and in an uninterrupted stream. The said agent then passes, through that annular portion of the outer pipe is which surrounds the pipe 2', directly into the bore m of the drill. As the pressure energy of the agent is partly converted into velocity energy when the said agent leaves the pipe, the flushing water issuing from the pipe 2' is ejected with greater force through the bore of the drill. Moreover, as the pressure agent issues at a point behind the point of issue of the flushing watergthere is continually formed a zone of compressed air of uniform pressure and of considerable jetaction, which zone closesthe rear opening into the bore m, and which, standing as a barrier to the jet of water, thus effectively prevents a leakage of the same into the in terior of the machine. The flushing device iskept completely independent of the operation of the pressure means within the machine proper, owing to the piston-rod (Z passing air-tight through the cover Moreover,

owing to the bore in the piston opening into the chamber 0 provided with the outlet a, there cannot occur in the chamber D a counter pressure in any way affecting the opera tion of the. machine.

Air under pressure always exists in the space D by reason of the zone of compressed air which closes the rear opening of the bore m.

The second form of flushing device illustrated in Fig. :2 has theadvantage of shorter length owing to the piston-rod a? being excluded; In order in every case to obtain a suliicient'jet adtion-of the flushing mixture in the'bore of'the drill it is possible,,oving to the c'ornpressedair and water being separately introduced, to obtain in the bore of the drill an exact regulation both of pressure and ofthe admitted quantities of compressed air and water before these enter the pipes Z and 7c,

1. A percussion machine drill, comprising a casing, a hollow drill at one end of the same, a piston guided longitudinally in the casing to and from the drill, a water supply pipe terminating within the drill, means for supplying water to said water supply pipe 7r at a pressure less than the flushing pressure, and a supply pipe for compressed air terminating within the drill, the said terminal of the said compressed air pipe being intermediate the terminal of the water supply 30 pipe and the piston, the said compressed air driving said water into said drill at the flushing pressure.

A percussion machine-drill, comprising a. casing, a hollow drill at one end of the same, a hollow piston guided longitudinally in the casing to and from the drill, a water supply pipe extending axially through the, piston and terminating within. the drill, and a compressed air pipe likewise extending axially through said piston and terminating in said space, the water pipe being co-axial with and arranged within the air pipe, said water pipe being connected at its rear end with the casing and said air pipe being connected at its rear end with the casing air tight from said water pipe.

3. A percussion machine-drill, comprising a hollow casing, a hollow drill at one end of the same, a cover at the other end, means f for delivering a continuous stream of water under pressure in drilling direction at the longitudinal axis of the machine, a piston guided longitudinally in the casing to and from the drill, and having at its rear end a piston rod guided air tight in said cover, said water delivering means terminating within the drill, and means for delivering a continuous stream of compressed air in the same space in drilling direction at the longi tudinal axis of the machine.

a. A percussion machine-drill conugrisin a hollow casing, a. hollow drill at one end of the same, a piston guided longitudinally in the casing to and from the drill, a water supply pipe extending axially through the piston and terminating within the drill, and a compressed air pipe likewise extending axially through said piston and terminating in said space, said piston having a bore of larger diameter than said pipes therein, and said casing having behind the piston an outlet. communicating with said bore.

5. A percussion machine drill, comprising af casing, a hollow drill at onenend of 1 5 the same, a piston guided longitudinally in the casing to and from the drill, a water supply pipe terminating within the drill, and a supply pipe for compressed air ter minating within the drill and connected to said casing away from the terminal of said. as my invention, 1 have signed my name in Water supply pipe, and a connecting pipe presence of two subscribing Witnesses.

between the terminal of the said compressed ROBERT MEYER. [10. SJ

air supply pipe and the space between the Witnesses:

' 5 said drill and the said piston. HELEN NUFER,

In testimony, that I claim the foregoing ALBERT News.

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