US2120361A

US2120361A - Water connection

Info

Publication number: US2120361A
Application number: US150482A
Authority: US
Inventors: George W Hulshizer
Original assignee: Ingersoll Rand Co
Current assignee: Ingersoll Rand Co
Priority date: 1937-06-26
Filing date: 1937-06-26
Publication date: 1938-06-14
Anticipated expiration: 1955-06-14

Description

June 14, 1938.

G. W. HULSHIZER WATER CONNECTION Filed June 26, 1937 INVENTOR {yell 71275122 ea av I H l5 ATTORNEY.-

Patented June 14, 1938 UNITED STATES PATENT OFFEE WATER CONNECTION Application June 26, 1937, Serial No. 150,482

6 Claims.

This invention relates to rock drills, and more particularly to a water connection for attaching the cleansing water supply hose to the rock drill casing.

One object of the invention is to maintain a fluid tight seal between the casing and a water connection swivelled in the casing.

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

In the drawing accompanying this specification and in which similar reference numerals refer to similar parts,

Figure 1 is an elevation, partly broken away, of a rock drill equipped with a water connection constructed in accordance with the practice of the invention, and

Figure 2 is a transverse View taken through Figure l on the line 2-2.

Referring more particularly to the drawing, 23 designates a rock drill comprising a cylinder 2| and front and

back heads

22 and 23, respectively, which constitute the casing parts of the rock drill and may be clamped together by side bolts I 9.

The front head 22 houses a chuck mechanism 24 to accommodate a working implement 25 and an anvil block 26 for transmitting the blows of a hammer piston 21 to the working implement. The working implement is of the hollow type, having a passage 28 for conveying cleansing liquid to the cutting bit (not shown). The rear end of the passage 28 accommodates the end of a water tube 29 which extends through the cylinder 2B and into a recess 30 in the back head.

On the rearmost extremity of the water tube 29 is a flange (H which seats upon the bottom of the recess 30 and is held in sealing relationship therewith by a plug 32 threaded into the recess. The flange 3i and the adjacent portion of the plug 32 are of smaller diameter than the recess 30 and cooperate with the Wall of the recess to define an annular chamber 33 which communicates with the interior of the tube 29 through a passage or passages 34 in the plug 32.

The cleansing water supplied to the water tube 29 may be conveyed to the rock drill from a source of supp-1y by a. conduit of which only the terminal connection 35 connecting the conduit to the casing of the rock drill is shown. The connection 35 extends into a recess 36 in the back head, and a passage 3?, also in the back head, affords communication between the inner end of the recess 36 and the annular chamber 33.

In accordance with the practice of the invention the connection 35 has a reduced end portion 38 extending into the passage 37, and in the bottom of the recess 3%; encircling the reduced portion 38 is a packing member 39 to prevent leakage of water from the passage 31 into the recess. The packing member 39 isheld in position, and may be compressed, by a bushing 40 threaded into the recess to secure the connection 35 to the back head. The bushing 40 has a coniforrn bore of which the surface 4| serves as a seat for a similar surface 42 on the periphery of the connection 35 and cooperates therewith to form a fluid-tight joint.

The connection 35 is swivelled in the back head so that the conduit connected thereto may be readily oscillated from one position to another. In order to make this movement possible it is essential that the connection be capable of a slight degree of endwise movement to break the frictional engagement between the surfaces 4! and 42 and that a yielding pressure, as for example that of the water and which, in the present instance, acts against a pressure surface 43 on the end of the reduced portion 38 of the connection, be employed to press the connection against the surface 4!. The pressure of the water, however, is often of too low a value to prevent accidental unseating of the connection, as when it is brought into contact with the work. The connection is accordingly provided with an additional pressure surface l4, preferably located at the end of larger diameter of the coniform portion and confronting the packing member 39, although spaced with respect thereto to provide a space or chamber into which pressure fluid is supplied by a passage 45 leading from a source of pressure fluid, as for example, the chamber 46 containing the throttle valve ll which controls the admission of pressure fluid into the rock drill for actuating its percussive element.

The passage 455 communicates with the recess 36 through ports 48 in the bushing 46 and the pressure fluid thus admitted into the recess acts against the pressure surface 44 for pressing the sealing engagement is maintained between the connection and its seat and at the same time the connection may be readily oscillated, as required, to dispose the attached conduit in a desired position.

I claim:

1. In a pressure fluid actuated rock drill, the combination of a casing and a conduit for liquid, a connection for conveying liquid to the conduit, sealing surfaces on the casing and the connection, a pressure surface on the connection sub jected to pressure fluid for maintaining the sealing surfaces in sealing relationship with each other, and means for preventing the flow of liquid to the pressure surface.

2. In a pressure fluid actuated rock drill, the combination of a casing and a conduit for liquid, a connection for conveying liquid to the conduit, sealing surfaces on the casing and the connection, and a pluralit of pressure surfaces on the connection, one of said pressure surfaces being subjected to the pressure of the liquid and the othen pressure surface being subjected to pressure fluid for maintaining the sealing surfaces in sealing relationship with each other.

3. In a pressure fluid actuated rock drill, the combination of a casing and a conduit for liquid, a connection for conveying liquid to the conduit and being swivelled in the casing, frusto-conical surfaces on the connection and in the casing, a

' pressure surface on the connection subjected to pressure fluid to maintain the frusto-conical surfaces in sealing relationship with each other, and means for preventing the flow of liquid to the pressure surface. I

4. A water connection comprising a casing having a passage for liquid and a channel for pressure fluid, a connection for conveying liquid to the passage and being swivelled in the casing, surfaces on the casing and the connection cooperating with each other to effect a-seal, and a pressure surface on the connection subjected to pressiu'e fluid to maintain the surfaces in sealing relationship with each other.

5. In a pressure fluid actuated rock drill, the combination of a casing and a conduit for liquid, a recess in the casing, a passage leading from the recess to the conduit, a connection swivelled in the recess and extending into the passage, a packing member encircling the connection to effect a seal between the recess and the passage, surfaces on the casing and the connection cooperating with each other to effect a seal, a pressure surface on the connection, and a passage for con veying pressure fluid into the recess against the pressure surface to maintain the said surfaces in sealing relationship with each other.

6. A Water connection for rock drills, comprising a casing, a connection swivelled in the casing, a packing member in the casing encircling the connection, and means to retain the connection in the casing and to compress the packing member.

GEORGE W. HULSHIZER.