US3368634A - Independent rotation rock drill - Google Patents

Independent rotation rock drill Download PDF

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Publication number
US3368634A
US3368634A US479113A US47911365A US3368634A US 3368634 A US3368634 A US 3368634A US 479113 A US479113 A US 479113A US 47911365 A US47911365 A US 47911365A US 3368634 A US3368634 A US 3368634A
Authority
US
United States
Prior art keywords
motor unit
rock drill
housing
motor
independent rotation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US479113A
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English (en)
Inventor
Earl B Lear
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chicago Pneumatic Tool Co LLC
Original Assignee
Chicago Pneumatic Tool Co LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chicago Pneumatic Tool Co LLC filed Critical Chicago Pneumatic Tool Co LLC
Priority to US479113A priority Critical patent/US3368634A/en
Priority to DEC14806U priority patent/DE1948305U/de
Priority to DE19661533650 priority patent/DE1533650B1/de
Priority to GB34279/66A priority patent/GB1128783A/en
Priority to SE10824/66A priority patent/SE315558B/xx
Application granted granted Critical
Publication of US3368634A publication Critical patent/US3368634A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B6/00—Drives for drilling with combined rotary and percussive action
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/65—Means to drive tool

Definitions

  • the invention comprises a pneumatic rock drill of the drifter type including an independent rotation pneumatic motor unit arranged externally of the housing and having its longitudinal axis parallel to that of the rock drillv
  • the housing of the motor unit is mounted upon the rock drill housing by means of axially slidable connections at each end of the motor unit housing.
  • the slide connection at one end includes bufler elements which yieldably resist axial movement of the motor unit in either direction relative to the rock drill.
  • a speed governor in the motor unit controls speed of the motor unit in a positive direction, but not in a reverse direction.
  • an object of this invention is to provide in a pneumatic rock drill independent rotation means for controlling rotation of the drill steel independently of the reciprocating action of the piston hammer; and to associate this independent rotation means with the rock drill in a practical and simple manner.
  • Another object of this invention is to associate with a rock drill an independent rotation motor unit externally of the rock drill in such manner that the one may be readily detached from the other; so that the motor unit does not interfere with the operating efliciency of the rock drill; and so that shocks imparted by the rock drill to the motor unit are absorbed without possibility of damage to either the rock drill or the motor unit.
  • a more particular object of the invention is to provide a cushioned slidable mounting of an independent rotation motor unit with a rock drill.
  • FIG. 1 is a view of an independent rotation rock drill embodying the invention, wherein the rock drill is shown in longitudinal section and the independent rotation motor unit is shown in full;
  • FIG. 2 is a longitudinal section of the independent rotation motor unit
  • FIG. 3 is a detail of the gear train at the forward end of the independent rotation motor unit
  • FIG. 4 is a detail section taken on line 4-4 of FIG. 2 directed to the mounting at the rear end of the independent rotation motor unit;
  • FIG. 5 is a section taken on line 5-5 of FIG. 2.
  • independent rotation rock drill illustrating the invention. It includes a rock drill to the outside of which is detachably mounted an independent rotation motor unit 11.
  • the rock drill shown is of the drifter type. It includes an elongated housing generally designated 12, comprising a plurality of sections rigidly bolted together i1 end-to-end relation, and adapted along its underside for mounting in conventional manner to a guide shell (not shown).
  • An inlet passage 13 at the rear of the housing is connectable through a suitable operator controlled supply valve (not shown) to a source of pressure air.
  • a conventional air distributing slide or air-blown valve 14 arranged in the rear of the housing in communication with the inlet passage functions in well known manner to distribute operating air alternately to opposite ends of a piston chamber 15 of the housing to repeatedly reciprocate a hammer or piston 16 to pound a striking bar 17. This action of the valve continues automatically until the operator shuts oil the air supply.
  • a chuck diver 21 Supported in bearings 18 and 19' for rotation in a front head section 20 of the housing is a chuck diver 21.
  • the latter drivingly engages a rotatable tool holder or chuck 22.
  • the striking bar 17 has limited axial movement in the chuck and chuck driver. It has an anvil portion 23 projecting through the chuck driver into the piston chamber where it is subject to the pounding action of the piston.
  • An externally projecting portion 24 of the striking bar is adapted to be coupled to a drill steel (not shown).
  • An intermediate portion of the striking bar, defined by radially extending ears or splines 25, has a slidable splined engagement with the chuck whereky rotation of the chuck is imparted to the striking bar.
  • a conventional cap 26 screwed over the front head of the housing bears against the chuck; and it may be removed when required to permit replacement of the chuck and striking bar.
  • a bushing 30 is provided in which the chuck rotates.
  • Reciprocation of the piston serves only to pound the striking bar. Here, it does not impart rotation to the chuck driver, nor to the chuck or the striking bar.
  • the motor unit 11 is operable independently of the reciprocating action of the piston and independently of the op eration of the rock drill to effect rotation of the striking bar.
  • the chuck driver 21 is formed with a pinion 27 which projects into a radial enargement 28 of the front head section of the housing.
  • An idler gear 29 supported in the enlargement connects pinion 27 with the pinion 31 of a driving shaft 32.
  • a bearing 33 supporting one end of shaft 32 is mounted in the enlargement; and a second bearing 34 supporting an opposite end area of the shaft is mounted in a cylindrical extension or support 35.
  • the extension 35 is bolted fast to the enlargement by means of a plurality of bolts 40, and extends from the enlargement with its axis in parallel relation to the longitudinal axis of the rock drill.
  • the function of the support 35 is to slidably support one end of the motor unit 11.
  • the driving shaft has a straight splined end portion 36 projecting axially beyond the extension 35.
  • a suitable motor 37 incorporated in the housing 38 of the motor unit functions to transmit rotary motion through a stage 39 of reduction gearing to the driving shaft 32 and as a consequence to the striking bar 17
  • the housing 38 of the motor unit is defined by a succession of sections bolted together in end-to-end relation. It includes a central section 41 in which the motor 37 is housed.
  • the motor used is a conventional air driven motor of the radially slidable blade type.
  • the stage,- of reduction gearing 39 is housed in the central section (forwardly of the motor. It includes a rotatable spindle cage 42 having oppositely extending hollow shafts 43 and 44 respectively supported in bearings 45 and 46. Bearing 45 is mounted in a back wall 47 of a closure section 48 of the housing.
  • the closure section is rigidly bolted to the front end of the central housing section 41.
  • Bearing 46 is mounted in a stationary spacer 49 positioned adjacent an end plate 51 of the motor.
  • the motor has a forward driving shaft 52 which extends freely through the rear hollow spindle shaft 44 into the spindle cage.
  • This motor shaft 52 has a straight splined driving connection with planetary gears 53 mounted in the spindle cage.
  • the planetary gears in turn mesh with a stationary internal gear 54.
  • the forwardly extending hollow spindle shaft 43 extends through its supporting bearing 45 and beyond the closure wall 47 into a recess 55 defined by a forwardly extending cylindrical skirt or sleeve 56 of the closure. In this recess the spindle shaft 43 sleeves over and has a.
  • a governor 58 is provided for this purpose. It is mounted in a governor housing section 59 bolted to the rear of the central section of the housing.
  • the governor section is provided with a pair of inlet passages 61 and 62 each connectable by a separate hose to a common supply control valve 69.
  • a valve 68 slida'ble in the valve cage is normally biased by a spring 69 to open condition relative to the radial ports 65.
  • a rear driving shaft 71 of the motor has a driving splined connection with the body 72 of the governor. Operation of the motor rotates the governor body 72. As the motor speed exceeds a predetermined limit, flyweights 73 pivoted in the governor body swing centrifugally to force a pin 74 to push a pin 75 against the slide valve. This causes the latter to progressively close over the radial ports 65 against the resistance of spring 69 so as to cut off operating air from the motor and thus retard the speed of the latter.
  • the control valve 60 whereby the operator controls the supply Oif operating air to the motor unit, is separate and independent of that (not shown) whereby the operator controls the supply of operating air to the rock drill. This enables the operator to control rotation of the striking bar 17 independently of the operation of the rock drill, and at speeds which are not dependent upon the reciprocating action of the rock drill piston.
  • An important feature of the illustrated independent rotation rock drill is the manner in which the motor unit 11 is mounted to the rock drill whereby the motor unit and its mounting :are protected against damage from shock imparted to the motor unit during operation of the rock drill.
  • the motor unit 11 is supported to the rock drill housing at its front end upon the extension 35 of the enlargement 28; and at its rear end it is supported by means of a bracket 77. It is supported by the extension and the bracket in such manner that its housing is clear of the housing of the rock drill, as indicated by the clearance 70, and so that its longitudinal axis is parallel to that of the rock drill.
  • the skirt 56 of the closure section sleeves with a slide fit over the cylindrical surface of the extension 35.
  • the housing of the motor unit terminates at its rear end in an axially extending cylindrical tailpiece or mounting shaft 78 which is supported by the bracket 77 (FIGS. 1, 2, 4).
  • the bracket includes a base portion 79 rigidly secured by means of a group of bolts 81 to an external raised or bossed portion 82 of the rock drill housing.
  • a central upright part 83 of the bracket has an axial hole 84 through which the tailpiece slidably extends. Sleeving the tailpiece between a fiat inner end face of the upright and an opposed fiat shoulder of the housing of the motor unit is a thick shock absorbing ring or buffer 85.
  • a second similar buffer ring 86 sleeves the tailpiece between opposed flat faces of the upright part of the bracket and a retaining washer S7.
  • the washer sleeves over a reduced end 88 of the tailpiece and is held in abutment with a shoulder 89 of the tailpiece by means of a nut 91.
  • the nut holds the tailpiece and buffer rings in assembled relation to the bracket in such manner that there is no axial end play between the buffer rings and the bracket or between the tailpiece and the bracket.
  • the butter rings are made of suitable material which is resiliout and compressible, which may be rubber, or a suitable plastic such as that known as polyurethane. It is understood that one or the other of the buffer rings is compressible accordingly as axial pressure is applied to the motor unit in one direction or the other.
  • the motor unit has a corresponding sliding movement relative to the extension 35 at its forward end.
  • the bracket 77 is located on the rock drill so that the extension 35 is not fully received into the recess 55 of the sleeve, as indicated by the clearance at 92; and a clearance, as indicated at 93, normally exists between the end of the extension and the back wall 47 of the sleeve 56. Shock forces imparted to the motor unit during the operation of the rock drill will cause the motor unit to move axially relative to its mountings and will be absorbed by the buffer elements. The extent of this movement, however, is relatively slight, and the clearance 93 provided between the extension and the back wall of the sleeve is ample to allow for such movement.
  • Cylindrical keys 94 are provided to prevent rotation of the motor unit relative to its mountings.
  • Each key is press fitted into the wall of the extension 35 and has a rear portion extending with a slide fit into an axial bore 95 in the back wall 47 of the closure 48.
  • the rear portions of the keys extend into the bores sufliciently to allow for relative axial movement of the motor unit, as indicated by the clearance 96.
  • the rock drill 10 and the independent rotation motor unit 11 may be operated, each independently of the other, and that the striking bar 17 is rotatable at the will of the operator independently of the operation of the rock drill or the reciprocating action of the piston. Further, the speed of the motor in a positive direction is automatically controlled by the governor so as to be maintained at a desired rate during the operation of the drill; but is not governed in a reverse direction. Further, by means of the mounting arrangement of the motor unit to the rock drill, shocks imparted to the motor unit by pounding of the piston against the striking bar are absorbed by the butter rings 85, 86 without consequent damage to the motor unit.
  • the force of the shocks cause the motor unit to move back and forth along its longitudinal axis.
  • the tailpiece 78 slides axially rearward relative to the bracket 77 compressing the inner buffer ring as it does so.
  • the front end 48 of the motor unit slides to a corresponding degree rearwardly relative to the extension 35, the key elements 94 and the driving pinion shaft 32.
  • the tailpiece slides forwardly relative to the bracket to compress the outer buffer ring 86 between the washer 87 and the bracket portion -83; and in this movement of the motor unit, its forward end 48 slides forwardly a corresponding degree relative to the extension 35, the key elements 94 and the driving pinion shaft 32.
  • the motor unit 11 may be readily detached from the housing of the rock drill for replacement or repairs by removing the securing bolts 81 so as to detach the bracket 77 and then by sliding the motor unit axially rearward until it is free of the extension 35.
  • an independent rotation rock drill including a rock drill member having an elongated housing and a rotatable tool holder in the housing, and a motor unit arranged externally of the housing having its longitudinal axis parallel to that of the rock drill and having a driving connection at a front end with the tool holder; means mounting the motor unit to the housing for limited relative axial movement comprising an axially slidable conncction of one end of the motor unit With the housing, an axially slidable connection of the opposite end of the motor unit with the housing, and buffer means yieldably resisting the motor unit in said movement.
  • an independent rotation rock drill including a rock drill member having an elongated housing and a rotatable tool holder in the housing, and a motor unit arranged externally of the housing having its longitudinal axis parallel to that of the rock drill and having a driving connection at a front end with the tool holder; means mounting the motor unit to the housing for limited relative axial movement comprising a front slidable connection of the motor unit with the housing, a rear slidable connection of the motor unit with the housing, and buffer means yieldably resisting the motor unit in said movement; wherein the front slidable connection includes a radial enlargement of the housing having a rearward axial extension, and a forwardly extending sleeve of the motor unit in which the extension is slidably received.
  • the rear slidable connection includes a bracket extending radially from the housing of the rock drill having an axial hole, and a rearwardly extending shaft of the motor unit slidably received in the hole.
  • the buffer means includes resilient compressible ring elements mounted on the shaft to either side of the bracket and retainer means holding the buffer means in abutment with the bracket.
  • the retainer means includes a shoulder at one end of the shaft abuttable against the ring element at one side of the bracket, .a second abutment slidable on the shaft abuttable against the ring element at the other side of the bracket, and an adjustable member on the shaft adjustable along the shaft relative to the second abutment to hold the resilient elements in abutting relation to the bracket.
  • a tool holder rotation means comprising a motor unit arranged externally of the housing having its longitudinal axis parallel to that of the rock drill, and including a motor element housed in the motor unit having a front drive shaft; gearing drivingly connecting the drive shaft with the tool holder; and shock absorbing means mounting the motor unit to the housing for absorbing the impact of shocks imparted to the motor unit by the pounding action of the piston hammer against the striking bar, wherein a first port is provided for supplying operating air to the motor in a positive direction, a second port is provided for supplying operating air to the motor in a reverse direction, valve means is provided for admitting operating air selectively to either the first or the second port, the motor element has a rear driving shaft, and a governor controlled

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Percussive Tools And Related Accessories (AREA)
US479113A 1965-08-12 1965-08-12 Independent rotation rock drill Expired - Lifetime US3368634A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US479113A US3368634A (en) 1965-08-12 1965-08-12 Independent rotation rock drill
DEC14806U DE1948305U (de) 1965-08-12 1966-07-28 Unabhaengig drehender gesteinsbohrer.
DE19661533650 DE1533650B1 (de) 1965-08-12 1966-07-28 Gesteinsbohrmaschine mit getrenntem Schlag- und Motor-Drehwerk
GB34279/66A GB1128783A (en) 1965-08-12 1966-07-29 Independent rotation rock drill
SE10824/66A SE315558B (en, 2012) 1965-08-12 1966-08-10

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US479113A US3368634A (en) 1965-08-12 1965-08-12 Independent rotation rock drill

Publications (1)

Publication Number Publication Date
US3368634A true US3368634A (en) 1968-02-13

Family

ID=23902710

Family Applications (1)

Application Number Title Priority Date Filing Date
US479113A Expired - Lifetime US3368634A (en) 1965-08-12 1965-08-12 Independent rotation rock drill

Country Status (4)

Country Link
US (1) US3368634A (en, 2012)
DE (2) DE1948305U (en, 2012)
GB (1) GB1128783A (en, 2012)
SE (1) SE315558B (en, 2012)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3640351A (en) * 1970-05-18 1972-02-08 Gardner Denver Co Force pulse shaping member for percussion tool
US3666022A (en) * 1970-11-23 1972-05-30 Edward A Bailey Striking bar
US4462467A (en) * 1981-11-09 1984-07-31 Hilti Aktiengesellschaft Percussion drill machine
DE19700701C2 (de) * 1997-01-13 2003-05-15 Deilmann Haniel Gmbh Drehbohrmaschine mit Werkzeugaufnahme und Spülmittelzufuhr
US20040099425A1 (en) * 2000-06-06 2004-05-27 Mathis Andrea Linard Rotary percussion device for a drill column
US20140193217A1 (en) * 2013-01-09 2014-07-10 Seti-Tec Dual-Motor Drilling Machine with Controlled Feed Speed

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2246910A (en) * 1940-07-30 1941-06-24 Chicago Pneumatic Tool Co Overbalanced governor
US3035799A (en) * 1959-06-22 1962-05-22 Thomas H Peirce Mounting
US3154158A (en) * 1962-02-15 1964-10-27 Ingersoll Rand Co Rock drill
US3232176A (en) * 1962-07-31 1966-02-01 Thor Power Tool Co Percussion tool

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1102677B (de) * 1957-07-08 1961-03-23 Mabag Maschb G M B H Drehschlagbohrmaschine mit Druckluft-antrieb und zwei Schlagkolben

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2246910A (en) * 1940-07-30 1941-06-24 Chicago Pneumatic Tool Co Overbalanced governor
US3035799A (en) * 1959-06-22 1962-05-22 Thomas H Peirce Mounting
US3154158A (en) * 1962-02-15 1964-10-27 Ingersoll Rand Co Rock drill
US3232176A (en) * 1962-07-31 1966-02-01 Thor Power Tool Co Percussion tool

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3640351A (en) * 1970-05-18 1972-02-08 Gardner Denver Co Force pulse shaping member for percussion tool
US3666022A (en) * 1970-11-23 1972-05-30 Edward A Bailey Striking bar
US4462467A (en) * 1981-11-09 1984-07-31 Hilti Aktiengesellschaft Percussion drill machine
DE19700701C2 (de) * 1997-01-13 2003-05-15 Deilmann Haniel Gmbh Drehbohrmaschine mit Werkzeugaufnahme und Spülmittelzufuhr
US20040099425A1 (en) * 2000-06-06 2004-05-27 Mathis Andrea Linard Rotary percussion device for a drill column
US6843329B2 (en) * 2000-06-06 2005-01-18 Andrea Linard Mathis Rotary percussion device for a drill column
US20140193217A1 (en) * 2013-01-09 2014-07-10 Seti-Tec Dual-Motor Drilling Machine with Controlled Feed Speed
US9387541B2 (en) * 2013-01-09 2016-07-12 Seti-Tec Dual-motor drilling machine with controlled feed speed

Also Published As

Publication number Publication date
DE1533650B1 (de) 1969-09-18
GB1128783A (en) 1968-10-02
DE1533650C2 (en, 2012) 1970-05-21
DE1948305U (de) 1966-10-27
SE315558B (en, 2012) 1969-10-06

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