US1589150A - Automatic air and water connection for water tubes - Google Patents

Description

June 15,1926. 4 1,589,150

c. c. HANSEN AUTOMATIC AIR AND WATER CONNECTION FOR WATER TUBES Filed August 7. 192 5 ,1 1.: Y a 4 V "1' 6' 9 11 y 7 s K i a I I Q1 %/H Y Z3 2 YU \-J $1.,

$1, m i y T INVENTOR.

R flkariedllgmwma r- BY z HAS ATTORN Patented June 15, 1926.

UNITED STATES Par-ear orries.

CHARLES C. HANSEN, OF EASTON, PENNSYLVANIA, ASSIGNOR TO INGER-SOIiiL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A'GORPORATION OF NEW JERSEY.

AUTOMATIC AIR AND WATER CONNECTION FOR WATER TUBES.

Application filed August This invention relates to rock drills, but more particularly to an automatic air and water connection for fluid actuated rock drills of the hammer type.

One object of the invention is to insure an adequate supply of cleansing fluid, either water or pressure fluid, to a drill hole and to prevent intermingling of such fluids during the normal operation of the drill.

Another object is to automatically open communication between a pressure fluid supply and a water tube for cleansing a drilled hole when the 1pressure of the water supply reaches or fal s. below a certain predetermined value. 1 V

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

The invention consists of the combinations of elements, features of construction, and arrangement of parts having the general mode of operation substantially as hereinafter described and more particularly pointed out in the appended claims and illustrated in the accompanying drawing.

The figure in the drawing is a sectional elevation, of so much of a rock drill as will serve to illustrate the invention.

Referring more particularly to the drawing, the invention is shown embodied in a rock drill having a cylinder A sealed at its rear end by a back cylinder washer B which also serves to centralize a back head G with respect to the cylinder A. The cylinder A and the back head C may be held in operative relation with respect to each other by any suitable means, such means preferably consisting of side bolts (not shown). A reciprocatory hammer piston D is provided for the cylinder A for delivering blows of impact to a drill steel (not shown).

In order to provide rotative movement to the piston D for preventing binding of the drill steel within the drill hole, a fluted rifle bar Ev engages the piston in the usual manner. A ratchet-head F preferably formed integrally with the rifle bar E carries a plurality of spring actuated pawls G adapted to engage teeth H carried by a ratchet ring J when the piston moves in one direction, but which will pass freely over the teeth H when the piston moves in'the opposite direction; In this way the piston which may be connected against relative rotation with the drill steel in any well known and suit- 7, 1925. Serial No. 48,759.

able. manner will be caused to describe a partial revolution on alternate strokes.

The throttle valve K rotatable in the back head C is connected with a supply of pressure fluid and controls the admission of pressure fluid to the drill. The distribution of pressure fluid may be controlled by any suit able valve, in this instance, a spool'valve L is indicated. The valve L is adapted to reclprocatein a valve chest 0 preferably formed integral with the cylinder 'A and in this instance bushings P and Q, provide a seat for the valve -L. The bushings P and Q are preferably unsymmetrical with respect to each other to prevent'improper insertion of said bushings into the valve chest 0. For this; reason a screw threaded plug B is formed eccentrically on the bush- WV which controls an inlet gap X between the inner endsof thebushings P and Q through whichpressure fluid passing from the throttle valve K through a main supply passage Y passes into the interior of the bushings P and Q. Supply passages Z and I) provide communication between the interior of the bushings P and Q and the front and rear ends respectively of the cylinder A. i

In order that the valve L may be quickly and positively reciprocated within the bushings P and Q, pressure chambers c and d are formed in the ends of the valve. A passage 6 formed diagonally through the valve provides communication between the chamber c and the interior of the bushing Q. Similarly, a passage 7 is formed preferably diagonally through the valve to provide communication between the interior of the bushing P and the chamber cl through the valve. By forming the passages e and 7 as described, a portion of the pressure fluid passing to one or the other of the ends of the cylinder will pass through one or the other of the diagonal passages e and f into the interior of the valve for throwing the valve to one of its limiting positions, either forwardly or rearwardly when the piston nears the end of its stroke dependin upon the direction in which the piston is moving. A main exhaust port 9 provides an escape for the pressure fluid from the cylinder and is controlled by the piston D.

Means are provided for removing the cuttings from the drill hole. To this end a water tube 72. is arranged through the drill and is supported at one end in the back head C. A threaded recess is formed in the back head C to receive a correspondingly threaded plug into which the water tube It extends and whereby said water tube is held in position. The plug is is preferably provided with a recess 0 to receive a packing 29, which may be of rubber or other suitable material, to cooperate with a collar Q of the water tube It for preventing leakage along said tube and also to provide a yield ing support for the water tube. A plate 1' arranged beneath the collar 9 and about the water tube It serves as a rigid support for the water tube in one direction andextends partly into the recess 0 to insure perfect sealing about said tube. In order to prevent excessive wear between the plate 9 and the bottom of the recess j, a washer s preferably of soft material is inserted between said plate and the bottom of the recess. The plug is is provided with flats t to receive a wrench whereby said plug may be readily screwed into and out of the back head C and preferably extends somewhat beyond the back head to receive aback head cap a to seal the recess j.

Means are provided for supplying cleansing liquid, usually water, tothe water tube. To this end a. connection 1;, which may be of any suitable form, is screwed into the back head C. The connection 0 in this instance communicates with the water tube it through a passage w in the back head and through a longitudinal exterior groove m in the plug 70, and through the water plug cap u and a passage 3 formed in the plug -70.

To the end that the drill hole may be properly cleansed during the drilling operation in case the pressure of the cleansing liquid or water becomes reduced to a value inadequate for eiiicient cleansing, or fails through other reasons, pressure fluid may be automatically substituted for removing the cuttings from the drill hole. Accordingly, a bore 2 is formed in the back head C and has a reduced portion 2 which communicates with the main supply passage Y through a passage 3. A passage 4 providescommunication preferably between the inner end of the bore a and the water connection 4). At the juncture of the bore 2 and the reduced portion 2, a valve seat 5 is formed to accommodate a reciprocatory needle valve 6. In this instance, the needle valve 6 is provided with a stem 7 to serve as a guide for a spring 8 inserted between said valve and a sealing plug 9 for holding said valve on the seat 5. A plurality of longitudinal grooves 10 are preferably formed throughout the length of the perimetric surface of the valve 6 to permit water under pressure to enter the bore .2 and act against the outer end of said valve to augment the force of the spring 8 for holding the valve on the seat 5.

During the operation of the drill, assuming that the force of the spring 8 together with the pressure of the cleansing water against the outer portion of the valve 6 exceeds the value of the pressure fluid acting against the inner end or face of the valve, water will flow from the connection 4) through the passage 10 and the groove 00 into the cap a and thence through the passage g in the plug in and through the water tube It to the drill hole. If, however, the pressure of the cleansing water should become reduced to a value sufficiently low to enable the pressure fluid acting against the inner face of the valve 6 to overcome the pressure acting against the outer end .of the valve, the valve 8 will be raised from the seat 5 and pressure fluid will flow through the passage and through the passages described as the course of the cleansing water. Pressure fluid thus flowing through the passage 4: will intermingle with the water in the connection 4; and will accelerate the flow of the water, thus assuring an adequate supply of cleansing fluid to the drill steel. In the event that the water supply should fail entirely, or should become cut-ofi for other reasons, a constant supply of pressure fluid will flow to the drill hole until a preponderance of pressure may again be obtained rearwardly of the valve 6. The valve 6 will then be forced to its seat and water alone will serve as the cleansing medium.

The advantages of the invention reside in the fact that a constant supply of cleansing fluid to the drill steel is at all times insured. This is particularly advantageous in cases where water alone is preferred as a cleansing agent, and which under normal conditions may be supplied to the drill steel without intermingling with the pressure fluid, which is often desirable.

I claim:

1. In a fluid actuated rock drill, the combination of a back head with a throttle valve in the back head, a source of pressure fluid supply communicating with the back head and controlled by the throttle valve, a water tube in the back head, a connection secured to the back head for conveying water under pressure to the water tube, a bore between the throttle valve and the water connection, a seat in the bore, a passage leading from one side of the seat to the connection, a passage leading from the other side of the seat to the throttle valve, and a spring pressed valve reciprocable in the bore to normally cooperate with the seat for preventing communication between the passages.

2. In a fluid actuated rock drill, the com bination of a back head With a throttle valve in the back head, a source of pressure fluid supply communicating With the back head and controlled by the throttle valve, a Water tube in the back head, a connection secured to the back head for conveying Water under pressure to the Water tube, a bore in the back head and having a reduced portion, a

needle valve in the bore, a seat for said valve, a spring for holding said valve on the seat, a passage leading from the bore to the connection for admitting Water underv pressure to the bore to augment the force of the spring for normally holding the valve on the seat, and a passage 1n communication with the throttle valve leading to the reduced portion to admit pressure fluid to said portion for unseating the valve and supplying pressure fluid to the Water tube When the Water pressure falls to a certain predetermined value. I i

In testimony whereof I' have signed this specification.

CHARLES C. HANSEN.

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