US2357001A - Drill steel centralizer - Google Patents

Description

Aug. 29, 1944. J. A. HOPE 2,357,001.

DRILL STEEL IENTRALI ZER Filed Nov. 10, 1941' INVENTOR JOHN A. HOP:

BY t 3 ATTORNEY Patented Aug. 29, 1944 2,357,001

DRILL STEEL CENTRALIZER John A. Hope, Lakewood, Ohio, assignor, by mesne assignments, to The Cleveland Pneumatic Tool Company, Cleveland, Ohio, a. corporation of Ohio Application November 10, 1941, Serial No. 418,441

'7 Claims.

This invention relates to improvements in drill steel centralizers. Where rock drills are caused to drill holes downward) relatively long drill steels are often employed. Consequently when a carried two parallel angle irons l6 which are of approximately th same length as the boom. These angle irons carry the drilling motor from which depends the drill steel l8. The

hole is being Started particularly it is essary centralizer is mounted upon these angle irons to provide Some form of guide for the owe nd at the lower ends thereof. It consists primarily of the steel, as otherwise it might be deflected of two bent or curved arms 20 and 2| which at Out O line rat e ea y W he probable result their anchored ends have integral tubular posts that the steel would be broken inasmuch as the 22 extending at right angles to the arms proper. upper d s mounted i t e dr l W ic is rig y These tubular posts receive hinge pins 23 which carried upon a supporting framework. These at their lower ends are journaled within blind auxiliary ing'means have come to be known bearings 24 forming an integral part of laterally as drill steel centralizers. projecting ears 25 that are perforated to receive n f j s f the pr sent nven ion is bolts 26 which extend through suitably located the provision of a centralizer of the character apertures in the angle irons IS. The upper ends stated which shall be of simple construction and of the pins 23 project beyond the hollow posts 22 y e fi in action d Which furthermore and extend into brackets 21 which are secured shall be s p l f r pi manipulationin to the angle irons by means of bolts 28. Around Order that the dr l Steel maybe q y e e each of the hollow posts 22 below its arm or in the centralizer or as quickly freed therefrom. 20 2|, as the case may be, there is a coil spring 29 Other objects. and features of novelty will apwhich bears at one end against the angle iron I6 p r as I pr d w h the d p n f that and at th other end has a hook extremity which embodi ent 0 e invention Which, the presses against the inner side of the arm 20 or poses of the present application, I ve uS- 2|, tending to throw the arm to its outermost potrated in the accompanying drawing, in which: sition i d t i Fi '7 st means may be g. 1 is a side elevational view of a Wheeled provided to limit the amount of this outward Carriage With drill parts mounted thereon ShOW- swing, and in the present instance such means in an application f my invention takes the form of arm extensions 3|] which are Fig. 2 is a fragmentary elevational view of the shaped t Contact the rearwardl extending centralizer and its mounting with the central- 30 flanges of th angle irons I6, 1261' arms C osed 0 i operative position- Near the free end of each of the arms 20 and 3 is a horizontal sectional w ta su 2| there is formed a substantially semi-cylindri- Stant y 0 t e l e o F 2 With the cal recess, and in these recesses are mounted latching g in Operative DOSitiOII- drill steel guide parts, preferably semi-cylindri- Fi 4 is. a ho o tal sectional view taken 5 cal bushings 3|, suitable. means such as machine s a y 011 the line of With the cellscrews, 32 being provided to hold the bushings tralizer arms in closed position but with the in place, Wh n th arms are pulled together latching dos withdrawn from operative position and held there the drill steel l8 may be rotated F 5 i a f m n l l v i n l v w looking within the bushings 3i and thereby held against in the direction of arrows 5-5 of Fig. p lateral movement in all directions.

Fi 6 is a verti a s t na v w taken sn Each of the arms 20 and 2| is bifurcated at its Stantia y O the line of 2, and free extremity beyond the bushings 3|, the bifur- 7 is a reduced View Corresponding to 4 cations of arm 20 having tapered tongues 33 cobut showing the centralizer arms in inoperative operating with complementary flared grooves 34 position. formed in th bifurcations of arm 2|. By this In the drawing I h v how at IU a carriage means when the arms are drawn together they frame provided with ground wheels II and I2 by are so guided as, to bring the bushings 3| into means of which the carriage may be moved from correct registry, overcoming any slight inaccuon operating position to another, and retractiracies which might tend to throw them out of ble prong means. 3 and I4 servi g to o d the so register, such for example as misalignment of carriage against accidental movement while the hinge pin bearings or warpage in the arms drilling operations are being performed. On the themselves. The bifurcated portions of arm 2| carriage there is mounted means, generally inhave aligned perforations to receive a pivot pin dicated at l5, for supporting in various different 35 which may be an integral part of a dog 36 positions of adjustment a boom IE on which are that is arranged to swing in the space between the bifurcations of both arms. On each side thereof the dog carries, a boss 31, see Figs. 4 and 5, which is flattened on one edge to seat beneath and frictionally engage the outer portion of a bifurcation on arm 20 when the two arms are brought together. The outer end of the dog 36 may be turned outward at an angle, as indicated at 38, to better constitut a handle. A leaf spring 40 one end of which is fastened by screw 4| to the arm 2| .and the other end of which bears upon the outer side of dog 36, tends to move the dog into operative position as shown in Fig. 3. When the two arms are swung together the dog is cammed outwardly by engagement of the bosses 31 with the outer sides of the tapered tongues 33 until these parts clear each other, after which the spring 4*!) acts to snap the dog inwardly to clamping position.

The removal of a drill steel for any purpose, as for example when a dulled steel is to be replaced by one which has been sharpened, may be efiected very quickly as far as the centralizer is concerned. The operator merely grasps the outer end 38 of the dog and swings the latter clockwis from the position of Fig. 3 until the bosses 31 clear the bifurcations on the arm 20, when the two arms are free to respond to their springs 29 for movement to the position illustrated in Fig. '7.

Having thus described my invention what I claim is:

l. A drill steel centralizer comprising a pair of pivoted arms the free ends of which are adapted to swing toward and away from each other, drill steel guiding parts mounted in said free ends, a pair of tongue and groove joints in said free ends spaced apart lengthwise of the drill steel, and clamping means comprising a dog pivotally connected with one arm and arranged to swing between said tongue and groove joints, said dog having lateral projections arranged to engage the other arm for securing the arms in operative position.

2. A drill steel centralizer comprising a pair of pivoted arms the free ends of which are adapted to swing toward and away from each other, drill steel guiding parts mounted in said free ends, and latching means to hold the arms in operative position, said latching means comprising a dog pivotally mounted on one arm, abutments on the dog and on the other arm adapted to interengage when the arms are in operative position, one of said abutments having a cam surface adapted as the arms approach each other to swing the dog on its pivot until the abutments pass each other, whereby when the arms reach operative position the dog may be swung to latching position.

3. A drill steel centralizer comprising a pair of pivoted arms the free ends of which are adapted to swing toward and away from each other, drill steel guiding parts mounted in said free ends, two tapered tongue and flared groove joints in said free ends, said joints being spaced apart lengthwise of the drill steel, and clamping means for fastening the arms in operative position.

4. A drill steel centralizer comprising a pair of pivoted arms the free ends of which are adapted to swing toward and away from each other, drill steel guiding parts mounted in said free ends, two tapered tongue and flared groove joints in said free ends, said joints being spaced apart lengthwise of the drill steel, latching means for holding the arms in operative position comprising a dog pivotally carried by one arm and arranged to swing in the space between said tongue and groov joints, said latching means being arranged to yield as the arms are caused to approach each other and to snap into latching position when the arms reach operative position.

5. A drill steel centralizer comprising a pair of arms individually pivoted to arock drill support the free ends of which are adapted to swing toward and away from each other, means for normally urging said arms away from each other, drill steel guiding means in said free ends, a tongue and groove joint in said free ends to insure the guiding parts reaching proper registration, and clamping means for fastening the arms in operative position.

6. A drill steel centralizer comprising a pair of arms individually pivoted to a rock drill support the free ends of which are adapted to swing toward and away each other, spring means carried by said pivoted ends for normally urging said arms away from each other, drill steel guiding means in said free ends, a tongue and groove joint in said free ends to insure the guiding parts reaching proper registration, and clamping means for fastening the arms in operative position.

'7. In a rock drill having a pair of members for supporting the motor and drill steel, a drill steel centralizer comprising a pair of curved arms, one end of each arm carrying a pinto be connected to said members for pivotally supporting said arms in spaced relation and the free ends of which are'adapted to swing toward and away from each other, spring means mounted on said pins for normally urging said arms away from each other, drill steel guiding means in said free ends, a tongue and groove joint in said free ends to insure the guiding parts reaching proper registration and clamping means for fastening the arms in operative position. v

JOHN A. HOPE.

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