Патент USA US2108989код для вставки
ROTATION MECHANISM ~ Fil’ed March 22, 19:57 45 4954 42% @5 jM21 BYÖ. H|S ATTORNEYx 2,108,989 Patented Feb. 22, 1938 UNITED STATES FA'EENT DFFICE 2,108,989 ROTATION MECHANISM Albert R. Mack, Easton, Pa., assigner to Inger soll-Rand Company, `Iersey City, N. J., a cor poration of New Jersey Application March 22, 1937, Serial No. 132,911 9 Claims. (Cl. 121-!7) This invention relates to a rotation mechanism for rock drills of the type in which the working implement and the piston actuating it are ca pable of free reciprocatory movement with re . 5 spect to each other. More particularly, the invention relates to a rotation mechanism adapted to effect a step-by step rotary movement of the working implement between blows cf the percussive element, and 10 an object of the invention is to assure a free ac tion of the percussive element so that it will be unhampered by the drag of the rotating parts of the drilling mechanism. Another object is to enable the percussíve pis 15 ton to at all times travel its nominal distance ir respective of the degree of rotary movement of the rotational parts. Still another object is to equip the rock drill with a powerful rotation mechanism which may 20 be of rugged construction and positive in action. Other objects will be in part obvious and in part pointed out hereinafter. In the drawing accompanying this specifica tion and in which similar reference numerals re 25 fer to similar parts, A Figure 1 is a longitudinal elevation, partly in section, of a rock drill equipped with rotation mechanism constructed in accordance with the practice of the invention, Figure 2 is a transverse view taken through 30 Figure 1 on the line 2_2, and Figure 3 is a perspective view of the rotation mechanism. Referring to the drawing, 20 designates a rock 35 drill comprising a cylinder 2l and front and back heads 22 and 23, respectively. These parts con stitute the casing of the rock -drill and may be held together in any suitable manner, as by side bolts (not shown) extending along diametrically 40 opposite sides of the rock drill. The cylinder 2l is bored to provide a piston chamber 24 having a free exhaust port 25 which is controlled by a hammer piston 28 reciprocable in the piston chamber. The hammer piston 26 45 is of the differential type and has a plain cylin drical stem 2l on the forward end thereof to de liver blows to a working implement 28 extending into the front head 22. The stem 2l extends slidably through a bush ing 29 carried by a head 30 inserted in the front end of the cylinder to form a closure for that end of the piston chamber 24. On the periphery of the head 30 is a iiange 3l which lies between the cylinder 2! and the front head 22 and has a ho-l low extension 32 extending into the rear end of the front head 22 to centralize the front head with respect to the cylinder. In the cylinder 2l, rearwardly of the piston chamber 24, is an enlarged recess 33 for the ac commodation of a valve chest 34. The valve chest forms a closure for the piston chamber and has a chamber >35 containing a distributing valve 3G whereby the distribution of pressure fluid to the piston chamber 24 is effected. rl‘he valve 36 is illustrated as being like that forming the subject matter of United States Pat ent No. 2,048,957 granted to W. A. Smith, Sr., et al, and accordingly has a plurality of channels 3l in its wall through which pressure fluid flows to inlet passages 38 in the valve chest and leading 15 to the rear end of the piston chamber 24. The pressure fluid employed for driving the piston rearwardly passes over the rear end of the valve to an inlet passage 39 communicating with the front end of the piston chamber through a branch passage 40. On the periphery of the valve 35 is a flange 4l of which the opposed end sur faces act as actuating surfaces for throwing the valve. The pressure Huid acting against these surfaces is conveyed thereto by cross-kicker pas sages 42 and 43 leading from` the piston cham ber 24, at points forwardly and rearwardly, re spectively, of the exhaust port 25, to the cor responding sides of the flange 4|. The pressure fluid distributed b-y the valve is conveyed the-reto by supply passages 44 in the valve chest and opening into a supply reservoir 45 in the front end of the back head 23. In the back head 23 is a throttle valve 4l, of the rotary type, having a bore 48 which may be in constant communication with a source of pressure fluid supply, and in the wall of the throttle valve 48 is a port 49 to register with a passage 50 opening into the supply reservoir 45. In accordance with the practice of the inven tion, t Ae chuck, designated in general by 5l and serving to guide and maintain the working im plement 23 in coaxial alignment with the ham pfîst-on 2G, journalled with its front end in a bore in the end wall of the front head 22, and a sleeve 53 press-fitted into the head 30 against the bushing 29 serves as a bearing for the rear end of the chuck. . For illustrative purposes, the chuck is shown chambered to accommodate a lugged working “ implement. It comprises a lchuck jaw 54 which extends into a chuck sleeve 55 and the rear end of the latter is the portion of the chuck mech anism that is journalled in the sleeve 53. With in the chuck sleeve is a bushing 56 to guide the 2 2,108,989 shank end of the working implement 28 and tuating surface l2, moves the piston 62along the which extends into a cavity 51 in the chuck sleeve splines 60 of the chuck sleeve to its rearmost lim to receive the blows of the hammer piston 26. iting position. In order that the chuck jaw 54 and the chuck Shortly prior to the delivery of its blow against Cn sleeve 55 may be held against rotary movement ' the working implement 28 the piston 26 uncovers with respect to each other the chuck jaw is pro the exhaust port 25 and the pressure ñuid em vided on its peripheries with longitudinally ex ployed for actuating both pistons, in the direc tending ribs 58 to interlockingly engage intro tions described, is then exhausted to the atmos verted ribs 59 on- the chuck sleeve 55. phere. Upon the subsequent admission of pres On the peripheryV of the chuck sleeve 55 are sure fluid to the front end of the piston cham 10 a plurality of spiral splines 6€! to interlockingly ber 2,4, for driving the piston 26 rearwardly to engage similar splines El on the inner surface of a sleeve or piston 62. The piston B2 is ar its initial position, pressure fluid also passes into the rear end of the piston chamber 63 and acts ranged within an annular piston chamber 63 against the actuating surface ’13. for which the peripheries of the sleeve 53 and the chuck sleeve 55 form the inner Wall and the extension 32~ and the wall of the front head 22 constitute the outer bounding surface. The is then driven forwardly. 15 During its forward movement the piston 62 is restrained against rotation by the pawls 69. front and rear ends of the said piston chamber are closed by the front head and the head 3l), respectively. In the arrangement shown, the inner surface 54 of the extension 32 serves as a guiding sur face for the rearward portion of the periphery of the piston 62, and the piston carries an in troverted frange having a surface 65 which slides on the periphery of the sleeve 53. To the end that the piston 62 may be caused to impart a step-by-step rotary movement to the chuck mechanism and; therefore, to the work ing implement 28, the piston 62 is further pro vided on the forward portion of its periphery with a series of longitudinally extending ribs 65 'I'he piston 62 which will then engage the teeth 10, and the spiral splines 6l will cause the chuck mecha nism to rotate in anti-clockwise direction, as 20 Figure l is viewed from the right hand side. Thus, the working implement is shifted to a new position during the rearward stroke of the ham piston 26 and will Yoccupy a new position on the working face for the subsequent Working 25 stroke oi the hammer piston. When the hammer piston again uncovers the exhaust port 25 the pressure fluid used for ac tuating it together with that acting against the actuated surface 'i3 of the piston 62 is exhausted 30 to the atmosphere thus completing the cycle of operations. In practice, the present invention has been which are in slidable engagement with similar ribs 6l' on the inner surface of a ratchet ring found to be a highly desirable device for effecting a step-by-step rotary movement of the working 58 encircling the piston 62. In the same trans verse plane as rthe ratchet ring and journalled in the adjacent portion of the front head 22 are implement. It has the desirable advantages that a powerful rotative vforce may be applied tol-the working implement and that the piston 26 is at all times entirely free tol complete its nominal stroke, irrespective of the degree of rotative move ment of the chuck. In other words, should the rotation mechanism encounter undue resistance pawls 69 to engage the teeth 'Hl on the periphery of the ratchet ring. The pawls 69 are suitably inclined to assure full areas of contact between their ends and the sides of the teeth 'i6 and are constantly urged toward engagingV position by spring-pressed plungers 'Il in the front head 22. The piston 62, like the piston 26, is actuated by pressure fluid and the front and rear ends of the piston 52 accordingly constitute actuating surfaces 'l2 and T3, respectively, against which pressure fluid acts for reciprocating the piston. The pressure fluid employed for this purpose is preferably supplied to the actuating surfaces si multaneously with the admission of pressure fluid to the ends of the piston chamber 24 so that the movement of the two pistons may be controlled by th-e same valve mechanism. In order to as sure this result the inlet passage 3S is extended to its movement so that the piston 62 will be caused to short-stroke the piston 26 may con tinue its normal action and thus, together with the impulses alternately applied to the ends `of the piston 52, assist in again freeing the working implement from the binding material. I claim: 1. Rotation mechanism, comprisingV a casing, a rotatable chuck member, a reciprocatory mem ber on the outside of the rotatable chuck mem ber, means on the members slidably interlocked with each other and being adapted to effect rela tive rotary movement between the members upon, 55 reciprocation of the reciprocatory member, `and beyond the passage »'¿59 and through the cylinder means for preventing rotational movement of and the head 3l) and opens into the rear end of the the piston chamber 63. CO The pressure iiuid supplied to therfront end of the piston chamber 63 for driving the piston A62 rearwardly is conveyed thereto by a passage 'i4 preferably leading from the rear end of the piston chamber 63 through the cylinder 2B, the flange 3! and the front head ‘22 to the front end of the piston chamber 63. The operation of the device is as follows: With the valve 36 in the position illustrated pressure fluid flows from the throttle valve through the T l) passages 3l, thence through the ports 38 into the rear end of the piston chamber 24 and drives the piston 25 forwardly against the working im plement 28. At the same time pressure fluid flows through the passage ‘I4 into the front end of the piston. chamber 53 and, acting against the ac reciprocatory member during alternate strokes thereof and thereby cause said reciproca tory member to impart rotary movement to the 60 rotatable chuck member. 2. Rotation mechanism, comprising a casing, a rotatable chuck member, a reoiprocatory member encircling the rotatable chuck member, means on the members slidably interlocked with each' other and being spiralled to effect relative rotary movement between the members upon reciproca tion of the reciprocatory member, and means for preventing rotational movement of the recip rocatory member during alternate strokes 70 thereof and thereby cause said reciprocatory member to impart rotary movement to»` the ro tatable chuck member. 3. Rotation mechanism, comprising a casing, a _rotatable chuck member, reciprocatory means 75 2,108,989 rotatable in the casing encircling the rotatable chuck member and being in splined engagement therewith, means for vaiving pressure ñuid to the ends of the reciprocatory means for actuating said reciprocatory means, and means controlling ro tational movementl of the reciprocatory means to enable said reciprocatory means to impart rota tional movement to the rotatable chuck member during alternate strokes o-f the reciprocatoryf 10 means. 4. Rotation mechanism, comprising a casing, a rotatable member, reciprocatory means rotat able in the casing encircling the rotatable mem ber and being in spirally-splined engagement 15 therewith, opposed actuating surfaces on the reciprocatory means intermittently subjected to pressure ñuid for actuating said means, and means for preventing rotary movement of the reciprocatory means during alternate strokes thereof and thereby cause a rotary movement of the rotatable member. 5. Rotation mechanism, comprising a casing, a rotatable member, a reciprocatory means en circling the rotatable member rotatable in the 25 casing and in spirally-splined engagement with the rotatable member, opposed actuating surfaces on the reciprocatory means intermittently sub jected to pressure iiuid for actuating said means, and ratchet and pawl devices for preventing ro tary movement of the reciprocatory means during alternate strokes thereof and thereby cause a ro tary movement of the rotatable member. 6. In rotation mechanism for rock drills, the combination of a casing and a hammar piston therein, a chuck in the casing, an annular piston rotatable in the casing encircling the chuck and being in spirally-splined engagement therewith, means for valving pressure ñuid to both pistons for actuating said pistons, and means controlling 3 rotational movement of the annular piston to impact rotational movement to the chuck during one of the strokes of the annular piston. 7. In rotation mechanism for rock drills, the combination o_f a casing and a hammer piston therein, a chuck in the casing, an annular piston rotatable in the casing encircling the chuck and being in spirally-splined engagement therewith, means for supplying pressure fluid to the pistons to cause said pistons to move simultaneously in 10 opposite directions, and means controlling rota tional movement oi the annular piston to impart rotational movement to the chuck during one of the strokes of the annular piston. 8. In rotation mechanism for rock drills, the 15 combination of a casing and a hammer piston therein, a chuck, a second piston reciprocable and rotatable in the casing and being in spirally splined engagement with the chuck, means for supplying pressure iluid to the pistons for actu ating said pistons, and means for preventing ro tational movement of the second mentioned pis t0n during one of its strokes and thereby cause said second mentioned piston to impart rotary 25 movement to the chuck. 9. In rotation mechanism for rock drills, the combination of a casing and a hammer piston therein, a chuck, an annular piston rotatable in the casing encircling the chuck and being in spirally-splined engagement with the chuck, means for supplying pressure ñuid to the pistons for actuating said pistons, a ratchet ring, means on the ratchet ring and the chuck forming a slidable interlocking connection therebetween, and abutment means to hold the ratchet ring sta 35 tionary during one of the strokes of the annular piston and thereby cause said annular piston to impart rotary movement to the chuck. ALBERT R. MACK.