US1606847A - Blowing device - Google Patents

Description

Nov. 16 ,1926. 1,606,847

' w. A. SMITH BLOWING DEVICE Filed August 7 1925 Patented Nov. 16 1926.

UNITED STATES PATENT OFFICE.

WILLIAMA. SMITH, or ATHENS, PENNSYLVANIA, ASSIGNQE 'ro INGERSOLL-RAND COMPANY, or JERSEY CITY, NEW JER EY, A coEPoRA'rIoN or NEW JERSEY.

BLOWING DEVICE.

Application filed August 7, 1925. Serial No. 48,713.

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

The objects of the invention are toselectively admit aiYuninterrupted supply of pressure fluid under full line pressure to the drill steel for cleansing the drilled hole and to hold the valve and the piston immovable while such pressure fluid is passing through the drill steel. 7

Other objects will appear hereinafter.

The invention consists of the combinations of elements, features of construction, and arrangement ofparts having the general mode of operation, substantially as hereinafter described and more particularly pointed out in the appended claims and illustrated in the accompanying drawings, in which- I Figure 1 is alongitudinal diagrammatic view in section of so much of a rock drill as will serve to illustrate the invention,

Figure 2 is a view similar to Figure 1 showing the reciprocating parts in another position, and

Figure 3 is a view similar to Figures 1 and 2 showing the manner in which pressure fluid is admitted to the drill steel.

Referring to the drawings, the invention is shown embodied in a drill having a cylinder A provided with a reciprocatory hammer piston B. A front head C is arranged atthe front end of the cylinder A and is centralized with respect thereto by a front cylinder washer D.- The cylinder A and the front head 0 are preferably held in operative position by the usual side bolts (not shown).

Disposed within the front head C is a rotatable chuck E having ribs F which cooperate "with flutes G formed on an extension H of the piston B to prevent relative rotation between said piston and the chuck E. The front end of the chuck E is bored as at J to receive a drill steel K and to hold said drill steel against rotation with respect tion and to permit rotation'of the rifle bar with the piston during the opposite stroke of the piston.' The rifle bar L in this in stance 1s adapted to project through a back cylinder washer O fixed in the rear end of the cylinder A to form a seal for said cylinder, the entire construction not being shown. A valve chest P is in this instance arranged longitudinally of the cylinder A and has a valve chamber Q in which chamber is' arranged a spool type distributing valve R. The ty e of valve here illustrated is like that covere in the copending application of W. vA. Smith Serial No. 23,181, filed, April 15, 1925, although any suitable valve in which kicker ports are employed for actuating the valve may be used. The valve shown has a central head S which controls a central inlet port T and has end heads U and V for controlling the main exhaust ports W and X respectively formed on opposite sides of the inlet port T. The ends of the chamber Q, are closed by bushings Y which also serve as stops for limiting the travel of the valve R. Motive fluid for actuating the piston is supplied to the rear and front ends of the cylinder through supply passages Z and I) respectively communicating with the valve chamber Q, on opposite sides of the central inlet port T.

Usually in drills employing valves of the type indicated in the drawings, kicker ports are used for controlling the action of the valve. Such kicker ports may be crossed as in the present instance in which a kicker port 0 leading from a'point rearward of the center of the cylinder A communicates with the front end of the valve chamber Q to admit pressure fluid to said front end for throwing the Valve rearwardly. A second kicker port or passage (2 communicating with the cylinder A at a point forwardly of its center extends to a bore 6 formed through the valve chest P between the chamber Q, and the cylinder A. Disposed within the bore 6 is a hollow rotatable plug f having an ablong port 9 adapted to constantly register with the passage d. A port k is formed near the rearward end of the hollow plug to register with a passage j leading from the bore e to the rearward end of the valve chamber Q.

Means are also provided for establishing communication between the hollow plug f and the front end of the valve chamber Q.

and to that end a port In" is formed in the front end of the hollow plu f to reglster with a assage in the va ve chest communicatmg at one end with the front end of the chamber Q. A handle or lever p is securedto one end of the hollow plug f for rotating said plug and, as in the present mstance, may prevent longitudinal movement of the plug in one direction. A nut q screwed onv the opposite end of thegilug f prevents endwise movement of sea .plug in the other direction.

In the operation of the device with the parts in the positions indicated in Flgure '1, pressure fluid for reciprocat ng the piston B is distributed to the opposite ends of the cylinder in the usual manner by .the valve R. During the normal operation of the drill, some leakage ma occur between the piston extension H an the ad acent parts to the drill steel. Such leakage, however, is insufficient to properly cleanse the drill hole.- If, after a certain period of drilling, it is desired to more thoroughly cleanse the drill hole, the plug 7 may be rotated a quarter turn from its normal position as shown in Figures 1 and 2 to that shown in Figure 3. In this position, the port it is moved out of registration with the passage 7' at the rearward end of the valve chamber Q. and at the same time the port is is moved into.

registration with the passage 0 leadilpgto. 1th

the front end of the valve chamber Q.

the plug in this position, a portion of the' pressure fluid admitted through the supply passage 6 to the front end of the cglinder A will pass through the passage (1 an g, thence through the hollow plug f and through the port is and the pasage 0 into' the front end of the chamber Q and hold the valve against the rearward bushing Y. By thus holdin the valve rearwardl and immovable the ront supply rt 6 be in constant communication wit the inlet port T to admit ressure fluid to the front end of the cylin er. In this way the piston B is moved to the rearward limiting position 1. In a blowing device'for a fluid actuated rock drill, the combination of a cylinder with a front head, a hammer piston in the cylinder, a fluted forward extension on said hammer piston, a drill steel supported. in

the port supply of pressure flui from the chamber to one end of the cylinder and along the fluted extension to the drill steel.

2. In a blowing device for a fluid actuated rock drill, the combination of a cylinder with a front head, a hammer piston in the cylinder, a fluted extension on said hammer piston, a drill steel supported in the front head' to receive the blows of said fluted extension, a valve chest on the cylinder having a chamber, supply passages and kicker ports leading from the chamber to the cylinder, a distributing valve in said chamber, and manually controlled rotary means in the valve chest forming part of one kicker port for admitting pressure fluid from the cylinder to the chamber, the pressure fluid thus admitted acting to hold the valve immovable in one end of the chamber to permit an uninterrupted supply of ressure .fluid from the chamber to one en of the cylinder and from the cylinder along the fluted extension to the drill steel.

3. In a blowing device for a fluid actuated rock drill, the combination of a cylinder with a front head, a hammer piston in the cylinder, a fluted forward extension on said hammer piston and extendinv into the front head, a drill steel supported in the front head to receive the blows of said fluted extension, a valve chest on the cylinder having a chamber, supply passages and kicker orts leading from the chamber to the cylin er, a

distributing valve in said chamber, and a hollow rotatable plug in the valve chest forming part of one kicker port for admitting pressure fluid from the cylinder to one end of the chamber, the pressure fluid thus admitted acting to hold the valve immovable in the opposite end of the chamber to admit an uninterrupted supply of pressure fluid from the chamber to the cylinder for withdrawing the fluted extension partly from the front head and to permit pressure fluid to flow from the cylinder to the drill steel.

4. In a blowing device for a fluid actuated rock drill, the combination of a cylinder with a front head, a hammer piston in the cylinder, a fluted forward extension on the hammer piston and reciprocable in the front head, a drill steel supported inthe front head to receive the blows of said fluted extension, a valve chest on the cylinder having a chamber, supply passages and the cylinder, a valve in said chamber, and

a hollow plug in the valve chest forming part of on'e'ki'cker port when in one position and adapted to be rotated-to another position for admitting pressure fluid from the cylinder to the front end of the chamber to hold the valve immovable in the rearward end of-said chamber in which position of the valve an uninterrupted supply of pressure fluid is admitted from the chamber to the cylinder for withdrawing the fluted extension partly into the cylinder and for permitting an uninterrupted flow of pressure fluid along said fluted extension to the drill steel.

5. In a blowing device for a fluid actuated rock drill, the combination of a cylinder with a front head, a hammer piston in the cylinder, 21 fluted forward extension on the hammer piston and reciprocable in the front head, a drill steel supported in the fronthead to receive the blows or said, fluted extension, a valve chest on the cylinder havchamber, and a hollow ing a chamber, supp;

front and rear klC er ports leading from the chamber to the cylinder, a distributing valve in the chamber, a bore between the chamber and the cylinder, a passage leading from the bore to" the front end of the lug in the bore forming part of one kiclEer port when in ODSPOSllIlOIl and adapted to be rotated to another position to register with said passage for admitting pressure fluid from the l-y passages and crossed cylinder to the front end of the valve to hold said valve immovable in the rearward end of the chamber, in which position of the valve pressure fluid may pass from the chamber to the front end of the cylinder for holding the piston in the rearward end of the cylinder to permit the passage of pressure fluid through the flutes in the extension v WILLIAM A. SMITH.

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