US1452154A - Rotation-release for rock drills - Google Patents

Description

Apr. 117, 1923.

C. C. HANSEN ROTATION RELEASE FOR ROCK DRILLS Filec. July 25, 1920 ATT RNEY Patented Apr.a N, 3923.

ATENT CHARIJES C. HANSEN, OF EASTON, PENNSYLVANIApASSIGNQB, T INGEEEOLL-RAND COMPANY, 9F lJ'ElV 'YQRK, N. Y., A CORPORATION OF NEW JERSEY.

' BQTATIDN RELEASE FOR ROCK DRILLS.

i Application filed July as,

To all whom it may concern.

Be itknoWn' that 1, CHARLES C. HANSEN, a citizen of the United States, residing at Easton, in the county of Northampton and State of Pennsylvania, have invented certain new and useful Improvements in Rotation Releases for Rock Drills, of which the following is a specification.

This invention relates to rock drills of the 10 hammer type having automatic rotation for the drill steel, as for instance rifle bar rotation, but relates more particularly to a device for releasing the rotation when desired. The primary object of the invention is to enable the operatorto change from a positive rotation to a slip rotation at will, as for instance ihhard ground.

If the drill steel sticks it may be desirable to release the positive rotation and permit the hammer to operate with the slip rotation or operate without rotating the .drill steel, until the normal positive rotation can be resumed, and my rotation releasing device accomplishes these objects in a simple and efiicient 5 manner without complication of. the parts. To these ends the invention is shown in one of its preferred forms in the accompanying drawings, in which- Figure 1 is alongitudinal sectional elevation of a rock drill containing the device,

Figure 2 is a longitudinal detail sectional elevation taken through the rear end of the1 piston hammer partly in perspective, an i Figure 3 is a transverse sectional view on the line 3-3 of Figure 1 looking in the direction of the arrows. i

In order'to illustrate the invention a fluid pressure actuated rock drill of the hammer 40 type having a riflebar rotation is illustrated, only so much of the operative parts being shown as will serve to make the invention clear, the ports and passages for the distribution of motive fluid to the hammer cyll inder being omitted as forming no part of the present invention. 1

Referring to'the drawings, the drill cylinder A is mounted on the shell B in the a usual manner. The machine is fed to its work by meansof the feed screw 0 having the feed screw nut D, the feed nut locknut E and the feed crank F.

Fluid pressure is admitted to the drill cylinder .A and its operative parts from the 1920. Serial No. 398,3?2.

inlet G and exhausted at the outlet H for operating the piston hammer J reciprocating Within the cylinder. lhe drill steel K is carried in the chuck o1" rotation sleeve L within the front head 0 and the forward extension of the shank ll of the piston hammer is provided with the straight flutes Q engaging corresponding grooves in the rotation sleeve L. In this instance a front cylinder washer or piston hearing it is located at the front end of the cylinder and forms a guide for the piston shank.

The rearward reduced extension of the shank S of the piston is hollow and internally fluted with spiral flutesl engaging the rifle bar U having a head V held between the rotation washer W and the back head X of the machine. The rifle bar head V is provided with the rotation pawls Y adapted to engage the teeth of the rotation ratchet ring Z, which is adapted to be held fromrotation by means of the rotation. re-' leasing device a preferably in the form of a pin slidable into and out of en agement with the ratchet rotation ring Z.

The ratchet ring Z is preferably provided with a recess 72 in its periphery, adapted to register with the recesses 0 and d in the cylinder A and back head X respectively of the machine. The pin a is conveniently arranged to slide longitudinally into the back head X and is provided with a cylindrical enlargement or head e for engaging the ratchet rin Z. Engagement between the back head ratchet Z and cylinder A by the pin a, having the enlargement e is thus effected at the point of juncture of all these parts, locking the back head X and ratchet Z together by asingle means at a common point. A spring f is adapted to becompressed between the head e of the pin and a shoulder g in the aperture it within which the head e slides. The pin a is also provided with a handle groove 0 when the pin is in locking position as indicated in Figure 2. When the pin is withdrawn to release the rotation as indicated in. Figure 1, the stop pin It is rotated and may lie against the back head to hold the pin in withdrawn position.

In the operation of the device the drill steel is rotated through the rifle bar rotation in this instance on the back stroke or up or button j and a stop is provided on the shank of the pin enters the engage stroke of the piston and this is a positive rotation when the pin a is in locking pos1-' tion as indicated in Figu rifle bar U is then held stationary as the rotation ratchet ring Z cannot turn. In case it is desired to change from positive to slip rotation, the pin a is withdrawn into the position indicated in Figure 1 thus releasing; the rotation and permitting the rotation ratchet ring Z to slip or rotate relatively to the drill casing. There may be a partial slip in which case there will be apartial rotation of the drill steel, but in case the resistance to rotation in hard ground is sufficient to overcome the frictional engagement between the rotation ratchet ring and the parts between which it is held, the hammer will operate without rotating the drill steel. The rotation releasing pin a is again moved into engagement with the rotation ratchet ring when normal positive rotation is to be resumed.

I claim:

1. A rock drill of the hammer type having rifle bar rotation for the drill steel including a drill casing, a back head a rotationratchet ri having a' recess in its periphery adapt to register with a' looking recess in the drill casing, a spring pressed pin carried in the back head in 1ongitudinal alignment with the drill casing, said pin adapted to enter said recesses and said ratchet ring, casing and back head at a point of juncture of said ratchet ring, casing, andback head for producing positive rotation of the drill steel, but removable therefrom to release the rotation and permit slip of the ratchet ring relative to the drill casing.

2. A rock drill of the hammer type havre 2 because theat a point of juncture of specification.

ing rifle bar rotation for the drill steel including a drill casing, a back head a rdtation ratchet ring having a recess in its periphery adapted to register with a looking recess in the drill casing, as ring pressed pin mounted in the back bee and a cylindrical enlargement at the end of said pin adapted to enter said recesses and engage said ratchet ring, casing and back head said ratchetring, casing and back head for producingpositive rotation of the drill steel, but removable therefrom to release the rotation .and permit slip of the ratchet ring relative to the drill casin and means for maintaining said pinin wi drawn position.

3. A rock drill of the hammer type havin rifle bar rotation for the drill steel,'a cy inder casing, a back head for the casing,

said rifle bar rotation including a rotation ratchet ring havin a recess in its periphery cess in the interior of the cylindercasing a recessin said back head, and'a' spring pressed pin carried in said recess vbeing in longitudinal alignment with the drill casing and having a cylindrical head at its inner end adapted to entersaid re istering recesses in the ratchet ring and cy inder casing at the point of juncture of said parts for producing positive rotation of the drill steel, means for withdrawing the pin into the back head to release the rotation and permit slip of the. ratchet ring relative to the drill casing, and means for locking said pin in retracted position.

In testimony whereof I, have signed this CHARLES c. HANSEN.

adapted to register with a locking re-

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