US 1592850 A
Description (OCR text may contain errors)
Patented July 20, 1926.
UNITED STATES 1,592,850 PATENT OFFICE.
CHARLES C. HANSEN, 0F EASTON, IPENNSYLVANIA, ASSIGNOR TO INGERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION 0F NEW' JERSEY.
Application led December This invention relates to rock drills of the hammer type but more particularly to an improved connection between the liquid conducting tube and the back head of the rock drill, including an improved means for removing the liquid conductingl tube in the event of breakage thereto or for any other reason. Most rock drills of the hammer type employ atube which extends through themachine and a short distance into the drill steel for conveying liquid under pressure to the hollow bore of the drill steel for the purpose of cleansing the drilled hole. These tubes frequently become sodamaged that they are of no further use, which necessitates the removal of the damaged tube and substitution of a new tube. Heretofore much trouble and annoyance has been occasioned in the removal of the damaged tubes. I t has also been a diiicult problem to obtain an eiicient Huid-tight connection between the liquid conducting tube .and the back head and frequently the liquid, usually water, enters the working parts of the machine and washes away the lubricant. This, of course, is disadvantageous and tends to shorten the life of the machine. By means `of my invention the above difficulties are overcome, as an eiiicient and reliable fluid-tight connection is obtained between theliquid conducting tube and the back head of the machine, while at the same time by means of a readily acces- -sible plug the liquid conducting tube and the associated vparts may'be 4conveniently removed from the back head of the machine and in the replacement of a new tube the `necessary parts to be replaced, besides the tube, would only be inexpensive iron. washers.
One objectief -my invention therefore is to enable a liquid conducting tube to be attached to the back end of a rock drill in a simple and improved manner so that an eicient Huid-tight connection therebetween is produced without the use of material such as rubber, which is subject to deterioration.
Further objects of the invention will hereinafter appear and the invention consists in certain features of construction and the combination of elements described in the following specification, described in the appended claims and shown in the drawings, in which,
Figure 1 is a side elevation of a rock drill of the hammer type showing my invention s, 1926. serial No. 74,040.
in horizontal section .along with so much of the rock drill as is necessary to illustrate gheuapplication of the invention to a rock Figure 2 is an enlarged detailed horizontal section of the connection between the liquid conducting tube and the back head shown in Figure l, and
Figure 3 is a detailed view of the threaded plug which is one of the elements of my invention.
Referring to the drawings, the back head A, the cylinder B and the front head C of a rock drill of the hammer type .are shown in proper relation each to each. A rock drill steel D is shown partly entering the rock face E and it is desired to feed .iuid under pressure through the bore F in the roclr drill to the drill hole G. In order to do this, .a fluid conveying tube H extends from the back head A of the rock drill through the cylinder B and the hammer piston (not shown) into the shank of the rock drill steel D. From the valve J regulating the supply of pressure iuid is a passage K leading into a cylindrical recess L in the back head. The luid conveying tube also extends into this cylindrical recess L, there being a slidable it between the tube H and the walls of the bore O in the back head, while a Hange P is provided on the end of .said fluid conveying tube. At the front end of the cylindrical recess L is a thin washerl Q preferably of some soft metal which is adapted to it around the tube H and to have the same diameter as the recess L. Against this is placed a cylindrical metallic body R with a bore of the same diameter as the tube H and of .sutlicient thickness to guide and hold the tube H rigidly. The front face of this metal body has been concentrically grooved so that it will bite the surface of the washer Q, when pressure is applied, while a circular recess has been cut in its rear face to receive the flange P of the fluid conveying tube H. Behind this metallic body R is a third thin metallic washer S adapted to lie over and upon the flange P of the tube H while having a hole in its center corresponding to the bore in the fluid conveying tube H. VThese parts are held in fixed relation to each other by means of the externally threaded plug T which is adapted to be screwed into the recess L against the rear metallicwasher S. The rearward half of this plug T protrudes from the rec-ess L while a bore U is provided through the center of the plug T to correspond with the bore in the fluid conveying tube H. .The
` rearward portion of this plug Thas been rel thereby serves to lock the back head plug T and to seal the recess L. As a result of the relieved or cut down portions ot the plug, a clear passage is provided `ior yliquid to be directed by the valve .l through the passage K, to the cavity la7 in thev head lof the cap V, and thence through the bore of the plug T, and the fluid conveying tube H, to the bore of the rocl drill steel F to the drill hole. Tn the assembly o'f this device it will be seen that the plug T be easily screwed into the recess' L and that pressure will thereby le apulied to the washers L and Q and the intermediatem-etallic body R and that as a result the castel-4 lations or grooves in its Jforward t'ace will bite into the washer Q and spread it against the cylindrical walls of the recess l), with a result that a water tight connection will be formed .for the liquid conveying tube l-l. ln order to remove the tube all that is nec essary is to unscrew the cap 'V and the plug T, whereupon the tube H can easily be eX- tractcd. i i
I claim: i I
l. In a rock drill, the combination ot' a back head, a cylindrical recess in said back head, a passage communicating withsaid recess into which liquid under pressure is adapted to be introduced, a liquid conducting tube co-aXial with the rock drill and extending into said recess, a' flange' on the end of said tube, a -i'ront metallic washer oi the same diameter as the said cylindrical recess adapted to lit around saidtube within the recess, an intermediate metallic cylindrical body in said recess oi: the saine diameter as the said recess adapted to itslidably Varound said tube and having .an indentation ,ssc
on the rear face thereof to embrace the flange on said tube, a rear washer ot the same diameter as the recess and adapted to overlap thesaid iiange on the tube and the rear tac-e ot the said metallic body, an en ternally threaded hollow plug adapted to be screwed into the said cylindrical recess and adapted to abut against the rear washer for holding the rear `washer against the said metallic body, a cap adapted to be screwed over the .said plug, and means for conveying liquid from the said recess into the bore of the said hollow plug.
2. In a vrock drill, the combination of a back head, a cylindrical recess 1n said back head, a passage in communication with said recess into which liquid'under pressure is adapted to be introduced, a liquid conductingl tube coaxial with the rock drill and extending slidably into said recess for a subantial distance, a llange on the end or said tube within the recess, a soit metallic washer adapted to lit around the said tube and in fr; Kore .id recess, a cylindrical body or washer lilie'v .se adapted to iit around the ,said tube and within the bore of said recess, the said body having a concentrically grooved iront iace liorcontact with the said iront washer and having a recess in its rear fare to receive the ilange on the AHuid conve fins tube a rear washer or the same. di-
ameter as the said recess and having a central hole to correspond with the bore of the said tube, adapted to lie over and hold the said tlange on the rear or" the said tube against said cylindrical body, an externally threaded hollow plug screwed partly into said recessand abutting against the said back washer having a bore corresponding to the hole in said washer, a recessed cap adapted to be screwed on the said plug to lock the plug and seal the back head, and a relieved portion on said plug to allow liquid to be conveyed from ,the said recess in the back head kto the bore in said plug and thence to the said fluid conveying tube. Tn testimony whereof ll have signed this speciiication. f f
CHARLES C. p HANSEN.