US2306040A - Rock drill - Google Patents

Description

Dec. 22, 1942.

'.1. c. CURTIS ROCK DRILL lFiled July 31, 1940 2 Sheets-Sheet 1 Mii/f.

Dec. 22, 1942.

J. C. CURTIS ROCK DRILL Filed July 31, 1940 2 Sheets-Sheet 2 MYX5.

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ROCK DRILL John C. Curtis, Claremont, N. 5E., assignor to Sullivan Machinery Company, a corporation of- Massachusetts Application July 31, 1940, sei-iai No. 348,759 7 Claims. (Cl. Z55-51) Ihis invention relates to rock drills, and more on line 8 8 of Fig. '7, illustrating the i'eed conparticularly to improved supporting and guiding trol device. means for the drill steel actuating motor of a Fig. 9 is a detail Vsectional View taken on line hammer rock drill. 2 9 .of Fig. 8.

It is an object of this invention to provide an 5 In this illustrative embodiment of the invenimproved rock drilling apparatus. It is another tion there is shown a drill 'steel actuating motor 'FlC object of this invention to provide an improved i of the drifter type mounted upon an improved structure for supporting and guiding a drill steel supporting and guiding structure, generally desactuating motor relative to its work. Still anignated 2.'

other object of this invention is to provide an l0 The drill steel actuating motor I is of the improved rock drilling apparatus of the type in pressure iuid actuated type of a standard and which a portion of the supportl is furnished by .vell known design, and comprises a motor cylthe face in which a hole is being drilled. A still inder 4 in which there is reciprocable a usual further object of this invention is to provide, in hammer piston adapted to actuate percussively a supporting and guiding structure for a drill a drill steel 5 supported in a usual manner withsteel actuating motor of the chain fed type, an in a front chuck housing 6. The cylinder 4 is improved support member adjustable for conprovided with a rear head block 7, andthe motrolling the tension ofthe feed chain. Still antor parts, including the cylinder, chuck housing other object is to provide, in a rock drilling apand rear head block, are held in assembled reparatus of the type above mentioned, an imlation by usual side rods 8. Pressure fluid is proved supporting. structure having an adjustsupplied to the motor cylinder from a supply line able, fluid actuated member for supporting the I0 under the control of a usual throttle valve drill at one of its ends. Still another object is mechanism I I having an operating handle I2.

to provide, in a supporting structure for a drill Now referring to the improved supporting and steel actuating motor, a fluid actuated means 2i guiding structure, it will be noted that there is slidably adjustable along a motor guide member provided an elongated guide member I3, shown for adjusting the tension on a feed chain for the herein as an vI-beam, and mounted on the formotor and operative for engaging an abutment ward end of the guide member for adjustment to support the drill. Other objects and advanlongitudinally thereof is an extensible, iuid tages of the invention will hereinafter more fulactuated, supporting device, generally designated ly appear in the course of the following descrip- I4, while attached to the rear end of the guide tion and as more particularly pointed out in the member is an adjustable supporting structure, appended claims. generally'designated I5.V The motor I is provided In the accompanying drawings, in which there with depending side portions I6 which are slidais shovm for purposes of illustration one embodi- 3.3 bly guided upon the upper anges I7 on the I- ment of the invention, beam guide member, and a feed chain I8 con- Fig. l is a view, in side elevation, of a drill nected to the drill motor passes around the ends mechanism in which the illustrative embodiof the guide member and is guided and controlled ment of the invention is incorporated. in a manner that will shortly be described more Fig. 2 is an enlarged horizontal sectional view, 4o in detail. Referring to the forward supporting de-"i with a portion broken away, taken on the line vice It, it will be noted that it comprises a cyl- 2 2 of Fig. 1. inder I9 arranged beneath the guide member in Fig. 3 is an enlarged cross sectional view taken a plane parallel to the longitudinal axis of the on the line 3 3 of Fig. 1. latter and having'a bore 20 which is closed at its Fig. 4 is an enlarged View, with parts in ele- 4- ends by cylinder heads 2| and 22. Reciprocably vation and parts in section, taken on the plane mounted in the cylinder bore is a piston 24 caroi` the line 4 4 of Fig. l. rying a piston rod 25 which extends through an Fig. 5 is an enlargedcross sectional View taken opening 23 in the Cylinder head 22 and has on the line 5 5 of Fig. 1, with parts omitted. threadedly secured to its forward end an abut- Fig. 6 is an enlarged horizontal sectional view 50 ment-engaging point 27. Formed integrally with :aken on the line 6 6 of Fig. 1. the vcylinder head 2| are projecting arms 29 hav- Fig. 7 is an enlarged view in longitudinal vering grooves 30 for slidably receiving lower flanges ical section taken through the improved drill 3| on the guide member i3, as shown in Fig. 4. nechanism shown in Fig. l. Attached to the cylinder head 22, as by bolts 32,

Fig. Sis an enlarged cross sectional view taken iS a block 33 Which iS provided With gIOOVeS 34 also slidably receiving the lower flanges` on the guide member. as shown in Fig. 5. The block 33 is provided with portions 36 extending upwardly about the sides of the guide member I3, and formed in the portions 36 at the forward end of the block are openings 31 which receive a bolt 38 extending transversely of the guide member in advance of its forward end. The bolt is secured in position by a nut 40 threaded upon its end, and rotatably mounted upon the bolt is a chain sprocket 4I about which the feed chain I8 passes. Mounted on the bolts 32 in advance of the block 33 are arms 44 carrying a guide member 45 for guiding the forward end of the drill steel while the hole is being started. Means are provided for moving the supporting device I4 and the chain sprocket 4I therewith forwardly along the guide member to increase the tension on the feed chain to the desired amount and tohold the device i4 in its adjusted position. This means comprises a block 41 adjustably mounted upon the lower flanges 3| on the guide member and held in any desired position by clamping bolts 48. A threaded rod 5I), fixed tothe cylinder head 2I as by welding, extends rearwardly through an opening in a dependingv portion 5I of the block 41 and has threaded upon it nuts 52 at opposite sides of the depending portion 5I for adjusting the device I4 relative to the block 41 and for locking it in its adjusted position. The piston 24 is moved forwardly in its cylinder bore to force the abutment-engaging point 21 firmly against a forward abutment, usually the working face, by pressure fluid supplied from a main supply line 54, under the control of a manually operated valve 55, to a flexible conduit 55, which conducts the pressure fluid, under the control of` a three-way throttle valve 53, through an opening 59 in the cylinder head 2l to the rear end of the cylinder bore. To release the point 21 from its abutment the throttle valve 58 is moved to cut off the flow of pressure fluid in the conduit 56 and to vent the cylinder bore 2D to atmosphere.

At the rear end of the guide member I3 are plates 60 attached to the sides ofthe guide member by bolts 6I; and supported by the plates is a device, generally designated 63, for controlling the motion of the feed chain I8. This device as hereinafter described is operative to cause hammer motor to advance along the guide bar step by step or to cause it to retract at will. Attached to the rearward ends of the plates Si) by a bolt 65 is a member 66 having a rearward portion fitting within a recess B8 in a connecting member GEI, as shown in Fig. 6. A pin 13 extends through an opening in the member 69 and fits within a groove in the portion of the member GS extending into the recess G8, for locking together the members 66 and 69. The member 6B is pivotally connected to a pivot-forming bolt 'I2 carried by a clamping device 'I3 adjustably mounted on the supporting structure I5, and a handle 14 on the bolt 12 effects clamping engagement ofthe clamping device with the supporting structure in its various adjusted positions.

The supporting structure I5 may be of a type similar to that disclosed in my copending application Serial No. 325,490, led March 23, 1940, and herein comprises a cylinder 15 having a lower cylinder head 16 to which there is attached an abutment-engaging point 11. Reciprocably contained within the cylinder is a piston, not shown. having a tubular-shaped piston rod the 'r extending through an opening in an upper cylinder head 80 and carrying an abutment-engaging point 82. Pressure fluid is supplied from the supply line 54 to a flexible conduit 83 which connects to the piston rod 19 adjacent the abutment engaging point 82, and pressure fluid flowing from the conduit 83 is delivered through the tubular piston rod to the cylinder beneath the piston for moving the abutment-engaging points 'l1 and 82 rrnly into engagement with extraneous abutments. A three-way valve 85, having a control handle S5, is provided for controlling the flow of pressure fluid through the conduit 83 to the cylinder or for cutting off pressure fluid supply and venting the cylinder to atmosphere to effect a release of the abutment-engaging points from their abutments.

Now referring to the specific structure of the feedv control device 63, it will be noted that the rearward portion of the feed chain IB passes around a chain sprocket 81 fixed to a control shaft 8S (Fig. 8). Also fixed to the shaft 88 is a rotatable ratchet ring 89, while keyed to the casing of the control device and arranged centrally within the ratchet ring is a non-rotatable pawl carrier carrying sets of oppositely acting spring-pressed pawls QI and 92. A conventional rotatable control ring 93 provided with an operating handle 94 is engageable with the pawls for throwing out either set of pawls from engagement with the ratchet ring, while the other set engages the ratchet teeth. Thus the pawls may effect control of the direction of rotation of the sprocket 81. As the hammer piston of the drill steel actuating motor is operated percussively to actuate the drill steel, longitudinal vibrations in opposite directions are set up Within the motor, and these vibrations create a jumping tendency of the drilling motor. This jumpingr action, either forwardly or rearwardly, effects feed of the drill motor along the guide and the direction of feed is under the control of the pawls of the ratchet mechanism. The feed chain I8, under the control of the ratchet mechanism, permits feed of the drill motor step by step along the guide in one direction while movement of the motor in the reverse direction is prevented. As this control device is of a well known form and as the mode of operation thereof, is well known to those skilled in the art, further description is herein unnecessary.

The mode of operation of the improved rock drill is as follows: The cylinder 15 of the rear supporting structure I5 is placed in any desired position and pressure fiuid is supplied to the cylinder from the supply line 54 and the exible conduit 83 to eect movement of the points 11 and 82 into engagement with suitable abutments. The clamping device 13 is moved into the desired position along the cylinder and is clamped in that position by operating the handle 14 to tighten the bolt 12. The supporting device I4 at the forward end of the guide member I3 is then moved forwardly, if this adjustment has not, as would usually be the case, been taken care of, by adjusting the nuts 52 on the threaded rod 5Il, to increase the tension on the feed chain I8 to the desired amount. The guide member I3 is swung about the pivot-forming bolt 12 at its rear end to bring the drill motor into the deaired drilling position, and then pressure fluid is supplied through the conduit 56 to the cylinder bore 20 at the rear end of the piston 24 for movingv the abutment-engaging point 21 firmly against the face of the work 'Thethrottle valve H is then opened to supply pressure iiuid from the supply line I to the -drill motor to eifect reciprocation of the hammer piston in a manner well known to those skilled in the art. The reversals of the hammer piston tend to produce jumps of the drill motorv and this jumping tendency is transmitted to the feed chain I8. The motion control device E3 permits the feed chain to be moved yby the jumps of the drill motor in one direction while holding the feed chain against movement in the opposite direction, thereby effecting feed of the drill motor in one direction or another depending on the adjustment of the motion control device.

As a result of this invention, it will be noted that an improved rock drill having an impro-ved adjustable supporting structure for supporting the drill motor in various positions relative to itsv Work is provided. It will further be noted that the supporting structure is not only rugged in construction, but is simple in design and composed of parts which may be inexpensively constructed and easily applied.

lWhile 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 modied 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:

1. In a rock drill, in combination, a uid actuated percussive type drill motor, means for supporting and guiding said drill motor for movement relative to its work comprising an elongated guide member, adjustable means for supporting the rear end of said guidemember, a duid-actuated abutment-engaging device adjustably mounted on the forward end of said guide member, a feed control chain attached to said drill motor and extending around the ends of said guide member, a motion control device at the rear end of said guide member for controlling movement of said feed control chain, means attached to said abutment-engaging device and arranged at the forward end of said guide member for guiding the trol chain, means for adjusting the position of said abutment-engaging device and said feed control chain guiding means attached thereto for regulating the tension on said feed control chain,

and means for supplying pressure fluid to said abutment-engaging device for effecting engagement of the latter with a forward abutment.

2. In a rock drill, in combination, a fiuid actuated percussive type drill motor, means for supporting and guiding said drill motor for movement relative to its work comprising an elongated guide member, adjustable means for supporting the rear end of said guide member, a cylinder adjustably mounted on the forward end of said guide member and nally thereof, a piston reciprocably mounted in said cylinder andl carrying an abutment-engaging point extending toward the forward end 3f said guide member, a feed control chain at- ;aclied to said drill motor and extending around he ends of said guide member, means arranged Lt the rear end of said guide member for conrolling movement of said feed control chain, neans attached to said cylinder and arranged movement of said feed conextending longitudiat the'forward end of said guide member for guiding the movement of said feed control chain, means for adjusting the and said feed control chain guiding means attached thereto for regulating the tension on said feed control chain,` and means for supplying pressure fluid to saidicylinder for moving said abutment-engaging' points into engagement with a forward abutment'.

3. In a rock drill, in combination, a drill motor, means for supporting and guiding said drill motor for movement relative to its work comprising an elongated guide member having spaced parallel guide portions extending longitudinally thereof, said drill motor being slidably guided upon certain of said guide portions, adjustable means for supporting one end of said guide member, a Iiuid actuated abutment-engaging device at the opposite end of said guide member and slidably mounted on said guide portions spaced from the portions guiding said drill motor, a flexible feed control element attached to said drill motor and extending around the ends of said guide member, a motion `control device for controlling movement of said exible feed control element, means attached to said abutment-engaging device for guiding the movement of said flexible feed control element, means for adjusting the position of said abutment-engaging device and said control element guiding means for regulating the tension on said flexible feed control element, and Vmeans for supplying pressure fluid to said abutment-engaging device for effecting engagement of the latter with a forward abutment.

4. In a rock drill, in combination, a guide, a drill steel actuator movable along said guide, means for feeding said actuator along said guide toward the Work including a iiexible feeding element, a support adjustably mounted on said guide and having means attached guiding the movement of said iiexible feeding element, said support being adjustable to vary the tension of said fiexible feeding element, an abutment-engaging element carried by said adjustable support and adapted for with the face of the work for supporting one end of said guide, and adjustable means for supporting the other end of said guide.

5. In a rock drill, in combination, a guide, a drill steel actuator movable along said guide, means for feeding said actuator along said guide toward the work including a iiexible feeding element, means carried by said guide and adjustable relative thereto for varying the tension of said iiexible feeding element, a projecting abutment-engaging element carried by said last mentioned means and adjustable relative thereto for engaging an extraneous abutment for supporting one end of said guide, and means for supporting the other end of said guide.

6. In combination, an elongated guide, a drill steel actuator movable along said guide, means for feeding said actuator along said guide including a iiexible element, a bracket attached to the front end of said guide and with which said fiexible element is operatively engaged, said bracket having a depending portion extending side of said guide, and an extensible support adapted for engagement with the face of the work for supporting the forward end of said guide, said extensible support including an element s'ecured to said depending bracket portion and extending longitudinally position of said cylinder thereto for 4 asoman along one: side-of: said guide, and said extensible support also including' an extensible portion guidedl on said element and projecting forwardly in advance of tl'iel forward end of said guide.

7. In combination, an elongated guide, adrill steel actuator movable along said guide, means for feeding said actuator along said guide including a flexible feeding element, a support carried by said guide and with which said flexible elementv is operatively engaged, means for adjusting said support relative to said guide to vary the' tension of said ilexible element, and an abutment engaging device secured to said adjustable support; and having a portion projecting longitudinally into engagement with an extraneous abutment for supporting said guide.

JOHN C. CURTIS.

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