US2164886A - Water tube for rock drills - Google Patents

Description

July 4,1939.

J. E. RENFER WATER TUBE EOR ROCK DRILLS Filed Dec. 17, 1937 INVENTOR Patented July 4, 1939 I 2,164,886

UNITED STATES PATENT OFFICE WATER TUBE FOR ROCK DRILLS John E. Renfer, Cleveland Heights, Ohio, assignor to The Cleveland Rock Drill Company, Cleveland, Ohio, a corporation of Ohio Application December 17, 1937, Serial No. 180,311

8 Claims. (01. 121-10) This invention relates broadly to rock drills, front housing I4 secured to the cylinder ID by but more particularly to an improved cleansing side bolts 15. Slidably mounted within the front fluid conveying tube construction for rock drills end of the sleeve [3, there is the shank I6 of a of the reciprocatory hammer type. drill steel I! having a hole l8 extending longi- Rock drills of the fluid actuated reciprocatudinally therethrough. In practice the rock drill 5 tory hammer type are usually equipped with a front end construction may also include a tappet tube extending longitudinally through the mal9 interposed between the end of the hammer chine for conveying cleansing fluid such as water stem I2 and the shank 16 for delivering the imor compressed air into the hollow drill steel for pacts of the hammer to the drill steel, or that washing or blowing clean the bottom of the drilled tappet may be eliminated to permit the direct de- 10 hole. This tube which is generally of a quarter livery of impacts from the hammer to the drill of an inch in diameter, is of sufficient length steel. to extend partway into the hollow shank of the Secured to the upper end of the cylinder l0 drill steel, thereby preventing excessive leakby the bolts l5, there is a back head 20 formed age of the cleansing fluid between the tube and with a screw threaded bore 2| accommodating 15 the shank of the drill steel irrespective of the the head 22 of a tube 23, which head is clamped rotary and limited longitudinal movement of the against a packing 24 by a removable plug 25 drill steel relative to the tube. screwed within the bore 2|. Formed within the In practice however, when using drill steels plug 25 there are passages 26 for admitting formed with imperfect shanks, such as shanks cleansing fluid from the bore 2| into the tube 23. 20

having the hole therethrough eccentric relative to Also located within the upper end of the cylinthe tube, the end .of the tube is likely to be bent der Hi, there is a valve block 21 and a rotation by the shank, thus causing the piston or tapmechanism including a stem 28 operatively aspet delivering blows on the shank to literally upsociated with the hammer I I for imparting rotaset the end of tube, thereby preventing the flow tion thereto, which rotation is transmitted to the 25 of the cleansing fluid through the tube and rendrill steel I! through the chuck sleeve l3. dering the removal of the tube from the machine The tube 23 is preferably made of metal and very diflicult. extends longitudinally into the machine through It is therefore one object of this invention to the stem 28, the cylinder ID, the hammer II and 30 produce a cleansing fluid conveying tube formed the tappet I9, for limited penetration into the 0 with a flexible terminal adapted to fit into the shank I6 of the drill steel l1. With the stem drill steel shank even though the hole extending 28 and at least one portion of the hammer l I, the

therethrough is located in eccentric relation reltube 23 is in close fit engagement to prevent ative to the center axis thereof. escape of the motive fluid therebetween, while Another object of this invention is to produce the front end portion 2 9 of the tube is prefera tube of the class above mentioned with a terably slightly reduced in diameter to provide a minal .or extension penetrating partway into the clearance between the tube and the outer end drill steel shank, and adapted to be moved thereportion of the hammer stem 12, thereby preventby without danger of damaging the tube. ing any slight burr or the like which may be Other objects of this invention will be apformed on the striking force of the hammer and 40 parent from the following detailed description around the tube, from scoring and damaging the wherein characters of reference designate cortube.

responding parts and wherein: Referring now more particularly to the inven- Fig. 1 is a longitudinal sectional view of a rock tion, 30 represents the terminal or extension of 5 drill embodying the invention. the tube 23, which is preferably made of flexible Fig. 2 is an enlarged longitudinal view of the rubber rigidly attached to the metal tube. To end of a cleansing fluid conveying tube conthis end, the metal tube 23 is formed with a tastructed in accordance with the invention. pered end 3| affording a relatively large sur- Fig. 3 is a cross sectional view taken in a plane face on which is glued or vulcanized the rubber indicated by line 3-3 in Fig. 2. terminal 30, which is mounted coaxially thereon 50 Referring to the drawing, 10 represents a rock and of a diameter equal to that of the metal drill cylinder having a fluid actuated hammer tube portion adjacent thereto. The terminal 30 ll reciprocable therein and formed with a splined is also provided with a hole 32 extending longistem I2 operatively associated with a chuck sleeve tudinally therethrough as a continuation of the I3, which sleeve is rotatably mounted within a hole 33 formed through the tube 23. To assure 55 and facilitate the insertion of the terminal 30 into the drill steel shank l6, its outer end portion is preferably tapered as at 34.

In practice, the length of the rubber terminal 30 is about one inch and a half, and the length of the metal tube 23 is calculated to limit the penetration of the terminal 30 into the drill steel shank [6 to about three quarters of an inch, thereby allowing variations in the length of the shank l 6 without afiecting the flow ofthe cleansing fluid from the tube 23 into the drill steel H.

In operation, when the tube is used with an imperfect shank or with a shank; allowed to move laterally relative to the tube due to an imperfect fit between the shank I6 and the chuck sleeve 13, the portion of the rubber terminal within the shank will move with the shank, while the other portion thereof between the end. of the shank I6 and the end 3| of the metal tube 23 willbend or flex without damaging the tube nor affecting the flow of the cleansing fluid from the tube into the drill steel I1.

I claim:

1. A device of the character described including a metal tube formed with a flexible terminal of a diameter equal to the portion of said tube adjacent thereto.

2. A device of the character describedincluding a metal tube formed with a flexible rubber terminal integrally attached thereto and of a and aterminal made of flexible material integrally attached to the tapered end portion of.

said tube.

of a hammer reciprocating therein, of a front housing and a hollow drill steel shank slidable within said housing, of a cleansing fluid conveying tube made of metal extending through said cylinder and hammer with one end located within said housing falling short of said shank, and

an extension for said tube carried by the aforesaid end thereof, said extension being made of flexible material and extending into said shank.

6. A cleansing fluid conveying tube for rock drills formed with a front end portion of uniform diameter. including a terminal made of resilient material.

7. In' a. rock drill the combination with a cylinder, of a front housing and a hollow drill steel shank s'lidable Within said housing, and arigid tube extending through said cylinder formed witlraterminal made of flexible material extend ing partway into said. drill steel shank.

8. In.a'.rock drill the combination of a cylinder with a front housing having a hollowdrill steel 3 shank. slidable-therein; a rigid tube within said cylinder fallingshort of said shank, and a flexible terminal for said tube extending. from one end thereof into said shank.

JOHN E. RENFER.

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