US2001729A

US2001729A - Drilling apparatus

Info

Publication number: US2001729A
Application number: US728581A
Authority: US
Inventors: Huffman Mervin Chester
Original assignee: Sullivan Machinery Co
Current assignee: Sullivan Machinery Co
Priority date: 1934-06-01
Filing date: 1934-06-01
Publication date: 1935-05-21
Anticipated expiration: 1952-05-21

Description

May 2l, 1935. A M, c. HUFEMAN 2,001,729

DRILLING APPARATUS Filed June l, 1934 W 5y- 4Q www' Patented May 21, 1935 Damme APrARA'rus Mer'vin chester Huffman', claremo'ntfN. asV signor to Sullivan Machinery Company, a oorporation of Massachusetts f Application June 1, 41934., seriaiNo-t'asi '15 Claims.

u This invention relates to rock drills, and more vparticularly to improvements in the rotation control means of such drills.

An object of `this invention is to provide anim- `c proved rotation control meansfor a rock drill. Another object is to provide an improved drill steel rotation mechanism for a rock drill and havingembodied therein improved release means for such mechanism. A` further object `is .to provide in a rockv drill of the hammer piston type improved drill steel rotation mechanism of the intermittent ratchet and pawltype operated by the hammer piston of thedrill `and having .embodied therein improved releaseV means for 'the drill vmechanism whereby, when desired, rotation of the drill steel may be discontinued while the hammer piston continues to operate. These and other objects and advantages will, however, subsequently more fully appear.

In the accompanying drawing there is shown for purposes of illustration oneform which the invention may assume in practice.`

In this drawingz- Y Fig. lis a side elevational View of a stoper rock drill having embodied therein the illustrative formof the improved rotation control means.

` Fig. 2 is an enlarged longitudinal sectional viewY taken on line 2 2 of Fig.. 2. l

Fig. 3 is acrossv sectional viewtaken on line 3`3 of Fig. 2.v p, Fig. 4 is a fragmentary view taken in the plane of Fig. 2 showing the rotation control parts in` a diiferen'tposition.V

Fig. 5 is a cross sectional View( taken on line o.; 5`5 of' Fig. 2. l

In this illustrative embodiment of the invention, the improved rotation release mechanism is incorporated ina rock drill of the stoper type of a well known design, .generally comprising a hammer motor, generally designated Il, and having a cylinder 2 within which ahammer piston 3 is mounted `for reciprocation. vThis hammer-.piston isjprovided in` the `usual manner with a forwardly projecting striking bar 4 adapted to strike'against the shank of .a drill steel 5 loosely. mounted .in the usual manner within .a chuck mechanism housed within va front chuck housing 6 attached to .the front end of the motor cylinder. The hammer motor is supported by asuitable feed leg 1 Icomprising a feed cylinder 8 attached to therear rend of .the hammer motor .and containing a usual feed piston .having its feed piston rod .9 terminating inan4 abutment engaging point l0. The hamniermotor is supported and fed by meansof this feed leg and is held in position by .a usual .sup-

`hammer piston is transmitted to the drill steel (ci. 121-7)j M porting handle ilextending laterally from the drill. .Thegrasping portion of thissupporting handle may be grasped by the voperator `to support the drill and hold the drill against rotation about -its longitudinal axis `in a manner` well understood 5 inthe art. Fluid-'under pressure is supplied to the hammer motor l .and .thefeedleg l through usual supply `passages under` thecontrol of a usual .throttle valve I2 having anoperating handle i3.

The rotation mechanism for effecting rotation of the drill :steel 5 as itis percussively actuated by the piston 3is herein of `a well known construction and comprises an .oscillatory pawl car- .rier Y.I5 'carrying usual springpressed pawls |6 engageable with the .te'ethll of a'ratchet ring 118. Thisgratchet isherein arrangedwithin a rear head member I 9` interposed between the rear motor head and feed leg and is herein guided for mcniement ngially .of-.the drill ina Abore 2U formed inthe head member l 9. v Formed integral with the pawl` carrier and extending forwardly within the hammer piston is a'rie bar 2i having .spiralgrooves-engageable with spiral lugs formed on arie nut .22 secured Within the rear end `of the hammer piston as shown in Fig. 2. `The y Yratc'helgring is held against rotation by means of lug-like projections or keys 23 formed on its periphery and lengaging longitudinal grooves Vor rkeyeways v24 formed by projections from the walls of the bore lwithin which the ratchet ring is axially guided. As lthe hammer piston moves forwardly, the pawls iG'slip over Athe teeth of the ratchet ring to permit unimpeded forward move- :ment ofv the `hammer piston to effect its working stroke, and upon reverse movement of the ham- .mer -pistonthepawlsengagethe ratchet teeth, thereby holding the bar 2l against rotation, and

`as a result causing rotative movement ofthe hammer piston. This `rotative movement of the chuck mechanism through straight grooves 25 v formed on the piston striking bar 4 and engaging straightlugs formed within the usual chuck nut of the chuck mechanism. As the particular drill motor construction and steel rotation mechanism `are of a standard design, and as the particular fluid supply means for the motor and feed'leg are well known and do'not specifically enter into the invention, further description of the same is considered unnecessary. For details `of the 50 motor of this type reference may be had, if-desired, tothe patent to Gartin No. 1,929,420 grantlThe throttle valve I2 is provided with a port 36 communicable with a passage 31 communicating with a chamber 38, while formed in the .rear4 motor head is a chamber 39 communicating through a passage 49 with ythe fluid distributing means of the hammer motor. Communicating with the bore 29 at the rear side of the piston 39 f is a passage 4I communicable through a groove 42 formed on the throttle valve'with a ventpassage 43. When the ratchet ring and piston are in the position shown in Fig. 4, the pawls I6 engage the teeth' I1 of the ratchet ring and the rotation mechanism operates in a normal manner. If it is desired torelease the mechanism, for instance when the vdrill steel sticks orl during spotting of a hole, this may be accomplished by rotating the throttle valve I2 to the position shown in Fig. 2, thereby supplying live pressure fluid throughl the passage 4I to the rear pressure area on the piston 30. The pressure fluid flowing from the chamber 39 to the motor distribution means causes the pressure fluid in chamber 39 to assume a pressure substantially lower than in the chamber 38, and as a result the pressure acting on the rear pressure area of the piston 39 and on the rear pressure area on the projection 3| causes the ratchet ring to be shifted axially from the position shown in Fig. 4 to the position shown in Fig. 2. As the ratchet ring moves axially inwardly, the cam surface 35 on thev iiange 34 engages the lower edges of the pawls I6 throwing the latter inwardly into their released position out of engagement with the ratchet teeth of the ratchet ring. It will-thus be seen that the pawls at that time are entirely released from the ratchet ring and that the pawl carrierl is at that time free to oscillate, andas a result the rotation of the drill steel is interrupted. When the throttle valve I2 is rotated to the position shown in Fig. 4, the pressure Aarea on the rear side of the piston 30 is connected to exhaust, and as a result the pressure in chamber 39 acting on the inner pressure area `of the ratchet ringl causes the latter to move inwardly vto its normal position as shown in Fig. 4, and

asa result rotation of the drill steel is resumed. As a result of this invention it will be noted that there is provided an extremely simple and convenient mechanism for controlling the rotation of the drill steel of a rock drill, it being possible entirely to interrupt rotation at will. It will further be noted that the mechanism is free from any complicated operating or ad' `described one form which the invention may assume inpractice, it willl 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, drill steel rotation mechanism including relatively rotatable ratchet and pawl carrier elements, operative connections between one of the same and a drill steel to be rotated, means for holding the other element against rotation, means for moving said latter element axially, and means movable axially with said latter element to effect engagement and release of the pawls of the pawl carrier element from the ratchet.

2. In a rock drill, drill steel rotation mechanism including relatively rotatable ratchet and pawl carrier elements, operative connections between one of the same and a drill steel to be rotated, means for holding the other element against rotation, means actuated by fluid pressure for moving said latter element axially, and means movable axially with said latter element to eiect engagement and release of the pawls of said pawl carrier element from the ratchet.

3. In a rock drill, drill steel rotation mechanism including relatively rotatable ratchet and lpawl carrier elements, operative connections bement' being moved in the opposite direction invto its rotation effecting position also by means of fluid pressure.

4. Inl a rock drill, drill steel rotation mechanism including an oscillatory pawl carrier and a cooperating ratchet ring, keys on said ratchet ring engageable with keyways on the drill to hold said ratchet ring against rotation, means for eiecting axial movement of said ratchet ring, and pawl release means movable axially with said ratchet ring to effect release of the pawls from the ratchet teeth while said keys remain in interlocking engagement with said keyways.

5. In a rock drill, drill steel rotation mechanism including an oscillatory pawl carrier and a cooperating ratchet ring, keys on said ratchet ring engageable with keyways on the drill to hold said ratchet ring against rotation, means for effecting axial movement of said ratchet ring, pawl engaging and releasing means movable axially with said ratchet ring into pawl engaging and releasing position to release entirely the pawls from the teeth of said ratchet ring while said keys remain in interlocking engagement with sai-d keyways, and means for actuating said yratchet, ring moving means in one direction by fluid pressure.

6. In a rock drill, drill steel rotation mechanism including an oscillatory pawl carrier and a cooperating ratchet ring, keys on said ratchet ring cooperating with keyways on the drill to hold said ratchet ring against rotation, means for effecting axial movement of said ratchet ring, pawl engaging and releasing means movable axially with said ratchet ring into pawl engaging and releasing position to release entirely the pawls from the teeth of said ratchet ring, and

ymeans for actuating said ratchet ring moving means in either direction by fluid pressure.

7. In a rock drill, drill steel rotation mechanism including an oscillatory pawl carrier and a cooperating ratchet ring, keys on said ratchet ring engageable with keyways on the drill to hold said ratchet ring against rotation, means for guiding said ratchet ring for axial movement, pawl engaging and releasing means movable axially with said ratchet ring into pawl engaging and releasing v position to release entirely the pawls from the teeth of said ratchet ring, and means for actuating said ratchet ring in one direction by fluid pressure, including a piston secured to said ratchet ring and means for supplying iuid pressure to act on said piston.

8. In a rock drill, drill steel rotation mechanism including an oscillatory pawl carrier and a cooperating ratchet ring, keys on said ratchet ring engageable With lceyways on the drill to hold said ratchet ring against rotation, means for guiding said ratchet ring for axial movement, pawl engaging and releasing means movable axially with said ratchet ring into pawl engaging and releasing position to release entirely the pawls from engagement with the teeth of said ratchet ring, and means for actuating said ratchet ring in either direction by fluid pressureincluding a piston secured to said ratchet ring and means for supplying fluid pressure to act on said piston.

9. In a rock drill, drill steel rotation means including an oscillatory pawl carrier and a cooperating ratchet ring, operative connections between the pawl carrier and a drill steel to be rotated, means for holding said ratchet ring against rotation including members formed on said ratchet ring having interlocking engagement `With members formed on a relatively stationary part of the drill, means for effecting axial movement of said ratchet ring, and means movable axially With said ratchet ring for engaging the pawls of said pawl carrier for releasing the pawls entirely from the teeth of the ratchet ring.

10. In a rock drill, drill steel rotation means including an oscillatory pawl. carrier and a cooperating ratchet ring, operative connections between the pawl carrier and a drill steel to be ro-v tated, means for holding said ratchet ring against rotation including members formed on said ratchet ring having interlocking engagement with members formed on a relatively stationary part of the drill, means for effecting axial movement of said ratchet ring, and means movable axially with said ratchet ring for engaging the pawls of said pawl carrier for releasing the pawls entirely from the teeth of the ratchet ring, said ratchet ring being movable axially intoI pawl releasing position while said interlocking members remain in interlocking engagement.

11. In a rock drill, drill steel rotation means including an oscillatory pawl carrier and a cooperating ratchet ring, operative connections between the pawl carrier and a drill steel to be rotated, means for holding the ratchet ring against rotation including members formed on the ratchet ring having interlocking engagement with members on a relatively stationary part of the drill, means for axially moving said ratchet ring, and pawl release means movable axially with said ratchet ring for effecting release of the pawls of the pawl carrier from the teeth of the ratchet ring, said ratchet ring being movable axially to move said release means intoits pawl releasing position While said interlocking members remain in interlocking engagement.

12. In a rock drill, drill steel rotation means from engagement Vwith the ratchet teeth, and

means for moving saidrratchet element axially.

13. In a rock drill, drill steel rotation means including relatively rotatable ratchet andpawl carrier elements, the ratchet element having ratchet teeth with which the pawls of said pawl carrier element cooperate, means for holding said ratchet element against rotation and for guiding said ratchet element for axial movement, pawl release means movable axially with said ratchet element and engaging with the pawls of said pawl carrier element for entirely releasing the pawls from engagement with the ratchet teeth, and means actuated by fluid pressure for moving said ratchet element axially.

14. In a rock drill, drill steel rotation mechanism including relatively rotatable ratchet and pawl carrier elements, the ratchet element having ratchet teeth with which the pawls of the pawl carrier element are adapted to cooperate and movable into rotation permitting and rotation interrupting positions, meansfor interlockingsaid ratchet element with a relatively stationary part of the drill for holding said ratchet element against rotation when in either of its respective rotation permitting or interrupting positions, with respect tothe pawl carrier element, means for axially guiding said ratchet element during movement thereof into its different operative positions aforesaid, means movable axially with said ratchet element and engageable with the pawls of said pawl carrier element in one 0fsaid positions but not the other for entirely releasing the pawls from the ratchet teeth, and means for effecting relative axial movement between said elements.

15. In a rock drill, drill steel rotation mechanism including an oscillatory pawl carrier member and a cooperating ratchet ring, means on the ratchet ring engageable with means on the drill for holding the ratchet ring stationary as regards rotation While permitting axial movement of the ratchet ring, means for effecting axial movement of the ratchet ring, and pawl release means movable axially with said ratchet ring into a position to effect complete release of the pawls from the ratchet teeth While said holding means on the ratchet ring remain in engagement` With the hold ing means of the drill.

MERVIN CHESTER HUFFMAN.