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Publication numberUS2338625 A
Publication typeGrant
Publication dateJan 4, 1944
Filing dateFeb 28, 1940
Priority dateFeb 28, 1940
Publication numberUS 2338625 A, US 2338625A, US-A-2338625, US2338625 A, US2338625A
InventorsCurtis John C
Original AssigneeSullivan Machinery Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Rock drill
US 2338625 A
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Description  (OCR text may contain errors)

J. C. CURTIS Jan. 4, 1944.

ROCK DRILL Filed Feb. 28, 1940 2 Sheets-Sheet 2 azz@ Patented Jan. 4, 1944 ROCK DRILL John C. Curtis, Claremont, N. H., assigner to Sullivan Machinery Company, a corporation of Massachusetts Application February 23, 1940, Serial No. 321,346

(Cl. Z55-45) 1) Claims.

This invention relates to rock drills, and more particularly to improvements in the feeding mechanism of a hammer rock drill of the mounted type.

In hammer rock drills of the mounted type wherein a feed chain is employed to effect drill feed relative to the drill guide, the feed chain is often operated by an independent motor mounted on the drill guide and operatively connected to a feed sprocket which engages and drives the feed chain. The feed chain is guided for circulation on the guide and the ends of the feed chain are usually rigidly connected to a part of the drill hammer motor so that the longitudinal vibrations set up within the hammer motor during operation thereof are transmitted directly to the feed chain. Since one run of the feed chain is not under tension, the slack of the chain is suddenly taken up upon each forward longitudinal movement of the hammer motor, and as a result substantial jars or shocks are transmitted to the feed chain, thereby notonly reducing the life of the chain but greatly increasing the vibrations set up Within the entire drill and decreasing drilling efficiency.

From one of its aspects the invention may, in a preferred embodiment, include means forming a guideway, means for effecting movement of an element supported by said guideway along the latter, a hammer motor, and means for supporting said hammer motor for movement along the guideway providing a lost motion connection between the motor and the movement effecting means. Thus, the motor may, within the contemplation of this aspect of the invention, either be directly guided on the guidevvay and have a lost motion connection with a feed chain or the like, or be supported, as in the illustrative embodiment hereinafter disclosed, upon an element guided on the guideway and moved along the latter by feeding means, and have a limited sliding connection with such element.

From another aspect the invention may, in a preferred embodiment, include a hammer motor, and feeding means therefor including an elongated chain loop and means positionable in various selected positions with respect to the loop of the chain for controllinfr feed and in each of such positions, selected for convenience of access, coacting in like manner with the chain on the effecting of feed. Obviously, from this aspect, the invention may be embodied not only in independently power circulated chain or other flexible element feeds but also in "jump type feeds with flexible element loops having associated control means.

From still another aspect the invention may comprise improved means for maintaining effectivecooperative relation between a chain utilized in feeding and a sprocket rotatable during feeding including a chain guiding roller arranged with its axis in a common plane with the sprocket axis, said plane substantially perpendicular to the run of chain between the sprocket and the roller.

Other aspects of the invention will be apparent from the objects now to be enumerated, and the detailed description of a preferred embodiment, and the several appended claims.

An object of this invention is to provide an improved rock drill feeding mechanism. Another object is to provide an improved rock drill feeding mechanism having improved means for reducing to a substantial extent the transmission of the longitudinal vibrations of the drill hammer motor to the feeding elements of the feeding means. A further object is to provide an improved feeding mechanism of the motor operated, chain and sprocket type. Still another object is to provide in a feeding means of the above character improved means for substantially reducing the shocks transmitted to the feed chain. A still further object is to provide an improved mounting for the drill hammer motor whereby the transmission of the hammer motor vibrations to the feed chain is substantially reduced. Yet another object is to provide an improved sliding connection between the drill hammer motor and the feed chain whereby the vibrations transmitted to the side of the feed chain not under tension are substantially reduced. A still further object is to provide in a feeding means of the above character, improved means for facilitating release of a stuck drill steel. Other objects and advantages of the invention will, however, hereinafter more fully appear.

In the accompanying drawings there is shown for purposes of illustration one form which the invention may assume in practice.

In these drawings- Fig. 1 is a side elevational view of a rock drill constructed in accordance with an illustrative embodiment of the invention.

Fig. 2 is a view in central longitudinal vertical section taken through the rock drill shown in Fig. l, parts being shown in elevation to facilitatey illustration.

Fig. 3 is an enlarged fragmentary View taken in the plane of Fig. 2, showing the improved hammer motor mounting with the parts in forward feeding position.

Fig, 4 is an enlarged cross sectional View taken substantially on line 4--4 of Fig. 2.

Fig. 5 is an enlarged view in longitudinal section taken substantially on line 5-5 of Fig. 2.

Fig. 6 is a view similar to Fig. 3, showing the parts in the reverse feeding position.

Fig. 7 is an enlarged detail sectional view taken on line 1-1 of Fig. 2.

Fig. 8 is an enlarged detail sectional view taken on line 8 8 of Fig. 2.

In this illustrative embodiment of the invention there is shown a hammer rock drill of the mounted type generally comprising a drill hammer motor I, a drill guide 2 and feeding means generally designated 3, While the rock drill disclosed is shown in a vertically disposed drilling position and mounted on a column bar, it will be obvious that the same'may be disposed in any desired drilling position and mounted in any suitable manner.

The drill hammer motor I is of a conventional design and comprises a motor cylinder 4 containing a usual reciprocatory hammer piston for delivering impact blows to the shank of a drill steel 5 having a usual drill bit 6. The drill steel, as is usual in drill hammer motors of the type disclosed, is suitably supported in a front chuck housing 1 of the hammer motor. A rear head 8 has connected thereto a supply hose connection 9 for conducting pressure iuid to the motor cylinder. The chuck housing, rear head and motor cylinder are maintained in assembled relation by side rods I0. As is usual in drill hammer motors of the type shown, the hammer piston, as it is reciprocated in the motor cylinder, sets up longitudinal vibrations in opposite directions, due to sudden reversals in the directions of piston movement.

The drill guide 2 comprises a pair of parallel guide elements II, I I herein in the form of channel irons arranged in face to face, spaced apart relation with their flanges I2 projecting outwardly in opposite directions at the opposite sides of the guide, thereby to provide guide elements, as will later be explained. The channel irons II are rigidly secured together by bolts I3 which pass through spacing sleeves I4, in the manner shown in Fig. 4. A sliding trunnion support I5 has guideways slidably engaging the outer channel iron flanges and is adapted to be clamped in position by clamping elements I6 held in position by bolts I1. Simply by loosening the -bolts I1, the trunnion support I5 may be slid into different guide-supporting positions longitudinally with respect to the channel irons, and by tightening the bolts I1 the trunnion support may be firmly clamped in the desired adjusted position. The trunnion support has a usual swivel plate I8 adapted to be clamped in a usual saddle I9 mounted on a column bar 29. Supported at the forward end of the guide is a drill steel centralizer 2I of a conventional design adapted to embrace the drill steel 5 for guiding the latter during starting or spotting of a drill hole in a well known manner.

Now referring to the improved feeding means 3, it will be noted that secured by a clamp 22 to the outer side of the guide and slidingly engaging the outer flanges of the channel irons is a gear housing 23 which supports a feeding motor 24 herein of a conventional pressure fluid actuated type. Keyed to the motor power shaft 25 is a worm 23 meshing with a worm wheel 21 in turn keyed to a shaft 28. Fixed to the shaft 28 is a feed chain sprocket 29 which engages and drives a feed chain 30. Journaled on the sleeves I4 are guide rolls 3| engaging the opposite runs of the feed chain which extend longitudinally in parallelism with the inner and outer sides of the'channel irons, for guiding the chain for circulation with respect to the drill guide. The feed sprocket 29 is, as shown in Fig. 4, located directly opposite to a guide roll 3I so that the sprocket teeth are maintained in effective engagement with the feed chain. The feeding motor supporting housing 23 is adjustable longitudinally of the guide and may be secured by the clamp 22 to the outer` channel iron flanges in any desired predetermined position opposite one of the guide rolls 3I intermediate the end guide rolls, there being provided in the channel iron ange adjacent each guide roll a notch 32 for receiving a holding pin 33 secured to the clamp. Such feed motor adjustment enables positioning of the feed motor near the rear end of the guide during up-hole drilling and near the front end of the guide during down-hole drilling, thereby to facilitate control of the motor by the operator. The feeding motor 24 has a usual reversing valve 34 and the housing carries a throttle valve 35 for controlling the supply of pressure fluid from a supply hose connection 36 to the hose connection 9 for the drill hammer motor. 'Ihe throttle valve 35 also controls the supply of pressure fluid from the supply hose connection 36 to the motor 24, under the control of the reversing valve. The bolt I3 for the rearmost guide roll 3| is arranged to move in longitudinal slots 31 in the channel irons I I and has connected thereto a yoke 38 having an adjusting screw 39 engaging an end plate 4U se-` cured to the upper ends of the channel irons. When the rearmost bolt I3 is loosened and the set screw 39 is properly adjusted, the upper guide roll may be adjusted longitudinally of the drill guide to vary the tightness of the feed chain in an obvious manner, and thereafter the bolt may be tightened to hold rmly the guide roll in its adjusted position.

y Mounted on the drill guide for movement longitudinally therealong is a sliding frame 4I having longitudinal guideways 42 slidingly receiving the inner guide flanges of the channel irons. Secured by longitudinal tie bolts 43 to the sliding frame 4I are front and rear cross frame members 44 and 45, and the ends of the feed chain 39 are secured at 43, 46 to the front cross frame member 44 in the manner shown in Fig. 3. The drill hammer motor has a longitudinal sliding connection with the sliding frame 4 I, and to providel such connection the motor cylinder 4 has integral lateral guides 41, 41 slidingly received in longitudinal guideways 48 in the sliding frame. The hammer motor cylinder guides have limited longitudinal movement in the guideways 48 of the sliding frame 4I, and these motor cylinder guides have opposite end abutment surfaces 49 and 5U adapted selectively to abut against the cross frame members 44 and 45 respectively. The teeth of the worm gears 2S, 21 in the drive between the motor power shaft 25 and the chain sprocket 29 are self-locking and serve to hold the drill hammer motor against movement relative to the drill guide when the feeding motor is stopped, thereby preventing undesired movement of the hammer motor along the guide. Secured to the sliding frame 4I is a stop member 5I which is adapted to abut the rear channel iron plate 40 to limit the rearward movement of the drill hammer motor along the drill guide.

The mode of operation of the improved rock drill is as follows. The rock drill is first properly set up with respect to the work with the swivel plate i8 of the trunnion support i5 firmly clamped in position' in the saddle mounting it, in the manner shown in Fig. 1, with the drill steel engaged by the drill steel centraliser 2l. The operator may then manipulate the throttle valve 35 to admit pressure fluid from the supply hose connection 36 to the hose connection il for the drill hammer motor, thereby to effect percussive actuation of the drill steel E, and concurrently pressure fluid may be admitted, under the control of the reversing valve 313, to the feeding motor 24 to effect power rotation of the feed chain sprocket 2S through the worm gearing in a direction to effect actuation of the feed chain t@ in the forward feeding direction. Initially, the drilling motor cylinder guides 41 are in the forward position shown in Fig. 6 with the abutment surfaces thereof in abutting engagement with the front cross frame member M. When the drill hammer motor is fed forwardly along the drill guide into the position shown in Figs. 1 and 2, with the drill bit S of the drill steel engaging the face of the Work, and feed is continued, the sliding frame 4l moves longitudinally relative to the drill hammer motor cylinder guides el to bring the rear abutment surfaces 50 into engagement with the rear cross frame member d5, as shown in Fig. 3. When the rear cross frame member it is moved forwardly into abutting relation with the rear abutment surfaces 5i! on the motor cylinder guides, the drill steel is held against the work. As the motor hammer piston percussively actuates the drill steel, the drill hammer motor has alternating tendencies to forward and rearward longitudinal movements relative to the drill guide due to the sudden reversals in the directions of movement of the hammer piston, and the rearward longitudinal vibrations set up within the hammer motor are taken `by the tensioned run of the feed chain 3-9 while the forward vibrations are absorbed by the drill steel against the work due to the sliding connection 4l, 58 between the drill hammer motor and the sliding frame, thereby relieving the untensioned run of the. feed chain fromA any sudden shocks or which might be imparted thereto by the hammer motor. The direction of, feed may be readily reversed simply by manipulating the reversing valve 34 to reverse the feeding motor, thereby to reverse the direction. of rotation of the feed chain sprocket 2S, and as' the feed chain is actuated in the reverse feed eecting direction, the slidingv frame lll is moved rearwardly upwardly along the guideways of the drill guide until the front transverse frame member M abut's the front abutment surfaces 5l on. the motor cylinder guides, and thereafter the drill hammer motor and sliding frame move concurrently along the guide. At that time the untensioned run of the feed chain 39 is relieved of the longitudinal vibrations. of the drill hammer motor in a rearward direction. In the event the drill steel `binds or becomes stuck in the drill hole, the sliding connection lll, 43 between the drill hammer motor and feed chain 3S enables the feeding motor, when the latter is reversed to effect reverse feed, to come up to speed, before the lost motion Abetween the drill motor cylinder and sliding frame is taken up, and also, due to the sudden engagement of the front cross frame member 44 of the sliding frame with the hammer motor guide surfaces e9, there is imparted to the hammer motor a decided jar or vibration in a rearward direction which is transmitted to the drill steel to aid in the release of the latter.

As a result of this invention it will be noted that due to the improved feeding means the feeding elements are to a large extent relieved of the Vibratory action of the drill hammer motor. It will further be evident that by the provision of the sliding connection between the drill hammer motor and the feed chain, the shocks imparted to the latter are substantially reduced, thereby not only reducing the Vibration of the complete drill but also reducing the wear and tear on the feed chain and increasing drilling efficiency. Further, by the provision of the sliding connection, release of a stuck drill steel is facilitated. Other uses and advantages of the improved rock drill will be clearly apparent to those skilled in the art.

While there is in this application specifically described one form which the invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration, and that the invention may be modified` and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

l. In a rock drill, the combination comprising a guide, a hammer motor movable along said guide, a feed chain guided vfor circulation relative to said guide and operatively connected to said hammer motor, a series of guide rolls on said guide for guiding said feed chain, and a motor driven feed sprocket engaging said chain at a point directly opposite one of said guide rolls, said guide roll opposite said feed sprocket maintaining the sprocket teeth in engagement with said feed chain and the axes of rotation of said roll and sprocket lying in a common transverse plane perpendicular to the longitudinal axis of said guide.

2. In a rock drill, the combination comprising a guide, a drill hammer motor movable along said guide and in which longitudinal vibrations in opposite directions occur during the operation thereof, means for feeding said motor along said guide comprising a feed chain operatively connected to said hammer motor, a feed sprocket engaging said chain and a motor for driving said feed sprocket, and a longitudinal sliding connection. between said hammer motor and said feeding means providing an operative connection therebetween, said sliding connection permitting free and unimpeded movement of said hammer motor in the feeding direction relative to said feeding means for relieving said feed chain of the longitudinal vibrations of hammer motor in said direction, said sliding connection including a sliding frame guided for sliding movement longitudinally along said guide and to which said feed chain is operatively connected, said frame having longitudinal guideways and said hammer motor mounted in said frame guideways.

3. In a rock drill, the combination comprising a guide, a drill hammer motor movable along said guide and in which motor longitudinal vibrations in opposite directions occur during the operation thereof, means for feeding said motor along said guide comprising a feed chain operatively connected to said hammer motor, a feed having guides slidably sprocket engaging said chain and a motor for driving said feed sprocket, and a free longitudinal sliding connection between said hammer motor and said feed chain for relieving the latter of the longitudinal vibrations of said hammer motor in one direction, said sliding connection including a sliding frame guided for free sliding movement longitudinally along said guide and to which said feed chain is connected, said frame having longitudinal guideways, guides on said motor slidably mounted in said frame guide- Ways, and abutments on saidk sliding frame for limiting movement of said motor guides relative to said sliding frame guideways.

4. In a rock drill, the combination comprising a guide, a drill hammer motor movable along said guide and in which motor longitudinal vibrations in opposite directions occur during the operation thereof, means for feeding said motor along said guide comprising a feed chain operatively connected to said hammer motor, a feed sprocket engaging said chain and a motor for driving said feed sprocket, and a longitudinal sliding connection between said hammer motor and said chain feed for relieving the latter of the longitudinal vibrations of said hammer motor in one direction, said sliding connection including a sliding frame guide-:l for movement longitudinally along said guide, said frame having longitudinal guideways, guides on said motor slidably mounted in said frame guideways, and means for limiting movement of said motor guides relative to said sliding frame guideways including cross frame members secured to said sliding frame at the opposite ends thereof, said feed chain being connected to one of said cross members, and abutment surfaces on said drill motor guides selectively engageable With said cross frame members.

5. In a rock drill, the combination comprising a guide, a hammer motor movable along said guide, a feed chain guided for circulation on said guide and operatively connected to said hammer motor, a feed sprocket journaled on said guide and engaging said feed chain, a motor mounted on said guide for driving said sprocket, a stop on the rear end of said guide, and a stop movable with said hammer motor and enga-geable With said guide stop for limiting rearward movement of said motor.

6. In a drilling apparatus, in combination, means providing a guideway, a drilling implement, a hammer motor for actuating said drilling implement and movable along said guidevvay and Within which longitudinal vibrations in opposite directions occur during the operation thereof, loop chain feeding means for imparting a feeding thrust to said motor in one direction including taut and slack runs of chain, and means for providing a lost motie-n connection between said motor and said loop chain means for operatively connecting the same, said lost motion connection exceeding the length of the forward longitudinal vibrations when said drilling implement is in engagement with the work, between said motor and the slack run of said loop chain means, said lost mo-tion connection permitting free and unimpeded movement of said hammer motor in the feeding direction relative to said feeding means for relieving said slack run of the vbratory action of said hammer motor during the drilling operation.

7. In a rock drill, the combination comprising a guide, a drill hammer motor movable along said guide and in which motor longitudinal Vibrations in opposite directions occur during operation thereof, means for feeding said motor along said guide comprising a flexible feeding element operatively connected to said hammer motor, a feed member engaging said flexible element and a motor for driving Said feed member, land a longitudinal sliding connection between said hammer motor and said flexible feeding element for relieving the latter of the longitudinal Vibrations of said hammer motor in one direction, said sliding connection including a sliding frame guided for movement longitudinally along said guide, said frame having longitudinal -guideways, guides on said motor slidably mounted in said frame guideways, and means for limiting movement of said motor guides relative to said sliding frame guideways.

8. In a rock drill, the combination comprising a guide, a hammer motor movable along said guide, a flexible feeding element guided for circulation on said guide and operatively connected to said hammer motor, a rotatable feeding member journaled on said guide and enga-ging said flexible feeding element, a motor mounted on said guide for driving said rotatable feeding ele ment, a stop on the rear end of said guide, and a stop movable with said hammer motor and engageable with said guide stop for limiting rear- Ward movement of said hammer motor.

9. In a rock drill, the combination comprising a guide, a drill steel actuator movable along said guide, feeding means foi` feeding said drill steel actuator along said guide including a flexible feeding element, a series of guiding elements at points spaced longitudinally of said guide for guiding said flexible feeding element, a motor for driving said feeding means and operatively connected to said flexible feeding element, said motor mounted on said guide for bodily adjustment longitudinally relative thereto, and means for adjustably securing said motor to said guide longitudinally of the latter in predetermined positions opposite any one of said guiding elements.

l0. In a rock drill, the combination comprising a guide, a drill steel actuator movable along said guide, feeding means for feeding said drill steel actuator along said guide including a flexible feeding element, a series of guiding elements at points spaced longitudinally of said guide for guiding said flexible feeding element, a motor operated rotary driving element engaging said flexible feeding element for actuating the latter, and means for securing said rotary driving element to said guide in predetermined positions opposite any one of said guiding elements Whereby the latter one of said guiding elements serves to maintain said flexible feeding element in proper driven relation with said rotary driving element.

JOI-IN C. CURTIS,

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2559282 *Feb 23, 1946Jul 3, 1951Joy Mfg CoRock drill
US2614808 *Oct 14, 1948Oct 21, 1952Joy Mfg CoRock drilling apparatus
US2673071 *Jun 7, 1946Mar 23, 1954Joy Mfg CoRock drill
US2674441 *May 20, 1949Apr 6, 1954Joy Mfg CoSelf-supporting stoper rock drill
US2958514 *Dec 16, 1959Nov 1, 1960Consolidation Coal CoMine drilling machine
US3137353 *Oct 31, 1958Jun 16, 1964Joy Mfg CoRock drill jib and drill feed with pneumatic stinger bar
US3692123 *Oct 27, 1970Sep 19, 1972Ingersoll Rand CoDrilling machine
US4303132 *Feb 4, 1980Dec 1, 1981Joy Manufacturing CompanySafety device for rotary earth drilling apparatus
US5355965 *Mar 19, 1993Oct 18, 1994Vermeer Manufacturing CompanyMounting apparatus for a rotational drive unit
US7011166Sep 22, 2003Mar 14, 2006The Charles Machine Works, Inc.System and method for assisting with automatically connecting pipe joints with a horizontal boring machine
US7628226Jul 26, 2007Dec 8, 2009The Charles Machine Works, Inc.Automatic control system for connecting a dual-member pipe
US7987924Dec 7, 2009Aug 2, 2011The Charles Machine Works, Inc.Automatic control system for connecting a dual-member pipe
US8267202Mar 11, 2010Sep 18, 2012Caterpillar Global Mining Equipment LlcFeed chain automatic tensioner
Classifications
U.S. Classification74/829, 173/147
International ClassificationE21B19/00, E21B19/084
Cooperative ClassificationE21B19/084
European ClassificationE21B19/084