US1708975A - Rock-drilling apparatus - Google Patents

Description

Allril 1929- A. H. SKAER ET AL 1,708,975

' ROCK DRILLING APPARATUS Filed Dec. 18, 1925 2 Sheets-Sheet l Aprfl 16, 1929.

A. H. SKAER ET AL Filed Dec. 18, 1925 2 Sheets-Sheet 2 Patented Apr. 16 1929.

.UN-ITED STATES PATENT OFFICE.

an'ruua H. sxann'ann Answer 11. KATTERJOHN, on DENVER, COLORADO, assrcnons,

BY ivinsnn assrenmnn'rs. r THE eannNEn-nnnvnn COMPANY, on QUINCY, ILLI- NOIS, A. CORPORATION OF DELATVARE.

ROCK-DRILLING APPARATUS.

Application filed December 18, 1925. SeriaLNo. 76,311.

The object of the present invention is to provide effective means of a simple character that willentirely exclude air from the bores of the steel in rock drilling apparatus, while permitting the use of water, the eX- clusion'of air being under some conditions an absolutely essential requirement.

In the accompandng drawings': n

Figure 1 is a longitudinal sectional view through a drilling apparatus, showing the improved mechanism,

Figure 2 is a view partially in elevation and partially in section of the chuck-sleeve,

lligure 3 is a cross sectional view on the line of Figure 2,

Figure 1- is a view in elev tion of the PPQ l igure 5 is a sectional View on the line 55 of Figure l. 1

In" the embodiment.disclosed a cylinder member is employed, including-a barrel 6,

having a piston chamber 7, in which reciprocates a hammer piston 8, having a hammer extension 9 onits front end. V

Ahousing 1(') is mounted on thefront end of the cylinder member, and located in i said housing, is a rotatable chuck sleeve 11.

This chuck sleeve, as shown particularly in Figure 2, has an enlarged rear head or flange 12, provided with rearwardly extending lugs 13 that are interlocked with a sleeve let journaled on the front end of the bar-rel, and having a worm gear 15 mounted thereon.

The usual motor the casing of which is shown at 16, carried by the cylinder member, drives a worm '17 that is in mesh with the worm wheel. 15, as a consequence of which, it will be evident that the motor 16 will effeet the rotation of the chuck sleeve 11. The said chuck sleeve 11 has in its front portion a set of splines 18.

Located within the chuck sleeve 11 is a tappet 19 that is provided on its rear portion with a series of splines 20 that .slidably interfit the splines 18. The rear end 21 of this tappet is located in the path of the extension 9 of the piston hammer 8,. so that blows of impact are imparted to the tappet by direct contact between the extension 9 and said rear end 21. The tappet has an intermediate enlargement 22 and a front extension A retaining cap 24 surrounds the front extension 23 in advance of the enlargement 22 and is held in place by bolts 25, preferably yieldingly held in their rearmost positions by springs 26 mounted thereon. The tappet furthermore has a longitudinal socket 27 opening through its front end, and havingthe walls of its rear portion threaded, as shown at 28. The threads are preferably of relatively steep pitch, and are multiple-preferably triple. The drill steel, a portion of which is shown at 29, has its rear end correspondinglythreaded, as illustrated at 30, so that it can be readily screwed into place. This drill steel has the usual bore 31 therethrough. As clearly shown, the tappet 19 has a limited sliding movement in the chuck sleeve, but is rotate able therewith because of the iuterfitting splines. ltsrearward movement is determined by the abutment of the rear end 32 of the enlargement 22 against the front ends 33 of thesleeve splines 18 and by the abutment of the rearends 34 of the tappet splines with an internal shoulder 36 formed in the chuck sleeve, abutting surfaces being thus provided between the chuck sleeve and tappet. q a V r p Y A water-conducting tube 37 extends axially through the hammer piston 9, through the rear eiul 21 of the tappet 19 andinto the drill steel-receiving socket 27. A packing gland is formed in the tappet around 8 this tube. To this end a plug, sleeve .or washer 38. is fitted into. a socket 39 formed in rear of. thesteel-receiving socket 227, and is tightly compressed about the water tube 37. In advance of this packing is located a washer or sleeve d0 of hard steel, and of greater diameter than the packing. This plug preferably projects into the rear end of the drill steel-receiving socket 27, so that the steel will abut against its front end, as shown in Figure 1, and said plug will thus constitute means for transmitting the blows of impact to the drill steel. For the purpose of allowing the escape of any motive fluid that may find its way past the extension 9 1 0 of the hammer piston 8, ports 41 are formed through the chuck sleeve and open into the portion between the front end of the hammer piston 8 9 and the rear end of the tappet, these ports communicating with an external groove 42, which in turn has open communication through one or more ports 43 with atmosphere. Preferably also vent channels 44 and 45 are formed in the exterior of the tappet so as to allow the air to escape from the open spaces within the chuck; I

\Vith this structure, it will be noted that the tappetis in the nature of a cap upon the rear end of the drill steel, and that the two are secured together during the drilling operations. The tappet, however, can move freely, and thus deliver the necessary kinetic energy to the drill steel. At the same time air cannot find a passage tot-he bore 31 of the drill steel, because of the extended and large bearings around.

the tappet and the vent ports. Furthermore the} portion of the water tube extending a through the rear end of thetappet is effecshape, proportion'and minor details of construction may be'resorted to without departing from the spirit or sacrificing any of the advantages ofthe invention.

What'we claim, is:

1. In'rock drilling apparatus, the combination with a cylinder member having an extension, of a hammer piston in the cylinder member', a sleeve journaled on the extension, means engaged with the sleeve for rotating it, a housing in advance of the cylinder member, a chuck sleeve journ'aled in the housing and engaged with the sleeve on the extension,

, 2. In rock drilling apparatus, the combia tappet in the chuck sleeve to receive the piston hammer blows slidably interlocked therewith and having a steel-receiving socket in its front end.

nationwith a cylinder member, of a housing carried by the front end thereof, a retaining cap on the front end of the housing, a rotatable chuck sleeve in the housin and terminating at the cap, a tap )et slidably mounted in the chuck sleeve and projecting beyond the same and through the on p, said cap constituting means for retaining the tappet in the chucksleeve and said tappet having a steel-receiving socket in its front end, and

a hammer piston in the cylinder member that delivers blows against the rear end of the tappet.

3. In rock drilling apparatus, the combination with a cylinder member, of a housing carried by the front end thereof, a retaining cap on the front end of the housing, a rotatable chuck sleeve in the housing and terminating at the cap, a tappet slidably mounted in the chuck sleeve and projecting beyond the same and through the cap, said cap constituting means for retaining the tappet in the chuck sleeve and said tappet having a steel-receiving socket in its front end, the walls of the rear portion of said socket having threads that terminate short of the front end of the socket, and a hammer piston in the cylinder member that delivers blows against the rear end of the tappet.

4. In rock drilling apparatus, the combination with a cylinder member and a hammer piston therein, of a chuck at the front end of the cylinder member, a tappet slidably mounted in the chuck and receiving the blows from the hammer piston, said tappet having a drill steel receiving socket in its front end, a water tube extending through the hammer piston and into the socket of the tappet, packing in the rear rtion of the tappet around the tube, an a blowtransmitting anvil block in the tappet in advance of the packing and abutting against the packing and against a portion of the tappet around the packing.

In testimony whereof, we aflix our signatures.

ARTHUR H. SKAER. AUGUST H. KATTERJOHN.

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