EP0081897A1 - Foreuse à percussion - Google Patents

Foreuse à percussion Download PDF

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Publication number
EP0081897A1
EP0081897A1 EP82304174A EP82304174A EP0081897A1 EP 0081897 A1 EP0081897 A1 EP 0081897A1 EP 82304174 A EP82304174 A EP 82304174A EP 82304174 A EP82304174 A EP 82304174A EP 0081897 A1 EP0081897 A1 EP 0081897A1
Authority
EP
European Patent Office
Prior art keywords
piston
cylinder
bit
ports
tube
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.)
Granted
Application number
EP82304174A
Other languages
German (de)
English (en)
Other versions
EP0081897B1 (fr
Inventor
John Arthur Hurt
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.)
WEAVER AND HURT Ltd
Original Assignee
WEAVER AND HURT Ltd
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 WEAVER AND HURT Ltd filed Critical WEAVER AND HURT Ltd
Priority to AT82304174T priority Critical patent/ATE19130T1/de
Publication of EP0081897A1 publication Critical patent/EP0081897A1/fr
Application granted granted Critical
Publication of EP0081897B1 publication Critical patent/EP0081897B1/fr
Expired 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
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/06—Down-hole impacting means, e.g. hammers
    • E21B4/14—Fluid operated hammers

Definitions

  • This invention relates to earth boring equipment, and is particularly concerned with the type including a percussive drill.
  • valved drills a piston is provided within a cylinder, above which is a valve seat provided with port holes to direct compressed air either to the side of the piston to cause an up or return stroke or to the side of the piston to cause a down or drive stroke, as is dictated by a flap valve associated with the valve seat.
  • percussive drills are perfectly adequate for low air pressure drills although ingress of dirt can be a major problem should it pass below the flap valve and prevent the effective shut-off of air supply to one side or the other of the piston.
  • valveless drills which are far better suited to high pressure applications
  • a combination of ports closable by the piston itself are provided, and with air passageways extending through the piston, pressure air can be directed to one side of the piston to provide an up or return stroke, or to the other side of the piston to provide a down or drive stroke.
  • a drill bit is struck by the piston at the end of the drive stroke, the drill bit being held in a chuck at the end of a wear sleeve surrounding the cylinder.
  • valveless percussive drills Of particular importance in valveless percussive drills is the fact that a central bore is provided through the drill bit, so that compressed air can cyclically be passed into the bore hole to clear debris from around the drill bit, and encourage its passage up the bore hole outside the wear tube. Thus, as, or immediately prior to, the piston striking the bit, compressed air is fed to the cylinder beyond the piston in the direction of the drill bit, to provide the force for the up or return stroke.
  • the object of the invention is to provide earth boring equipment with percussive drills of the valveless type which eliminates the above- mentioned disadvantages.
  • a valveless percussive drill for earth boring equipment comprises an outer wear tube, compressed air inlet means to one end of the wear tube, chuck means for holding a drill bit to the opposite end of the wear tube, a cylinder located within the wear tube with an annular gap therebetween, an air diverter located at the end of the cylinder towards the air inlet, a sealing bearing located at the end of the cylinder towards the chuck, and a piston within the cylinder, said piston having a portion of reduced diameter adapted to pass through the sealing bearing to strike a bit held in the chuck, and there being porting to direct air to one side or the other of the piston to provide a drive and a return stroke.
  • the chamber formed between the piston and the cylinder at that end is effectively sealed from the bore through the drill bit by relatively simply, highly efficient and robust means, thereby avoiding completely a source of repeated drill failures in prior constructions.
  • valveless percussive drill bit for earth boring equiment is illustrated in the accompanying drawing which is a part sectional side elevation through a valveless percussive drill bit of the invention.
  • a valveless percussive drill bit has an outer wear tube 1 provided at one end with a compressed air inlet or backhead 2 and at the opposite end is a chuck 3 in which is secured a drill bit 4.
  • a cylinder 5 Located within the wear tube 1 is a cylinder 5, there being between the cylinder and the wear tube an annular gap of approximately 0.075 inches.
  • a diverter block 6 is provided to allow compressed air to pass from the inlet 2 to the annular gap between the cylinder and the wear tube, and at the opposite end of the cylinder an integral sealing bearing 7 is provided.
  • a piston 10 Spaced along the length of the cylinder 5 are two sets of ports 8 and 9, and within the cylinder there is provided a piston 10 having a first groove 11 associated with air passageways 12 and a second groove 13 associated with air passageways 14.
  • ⁇ -, projection portion 15 At the end of the piston towards the sealing bearing 7, there is provided ⁇ -, projection portion 15 of reduced diameter, and of a diameter to constitute a sliding fit within the sealing bearing.
  • the inertia in the piston will bring it down the cylinder until such time as the end of the portion of reduced diameter is in contact with the end of the drill bit 4.
  • the groove 13 in the piston is aligned with the inlet ports 9, and at the onset of pressure air, it is directed through the diverter 6 down the annular gap, through the ports 9 and along the air passageways 14 into a chamber 16 formed between the projecting portion 15 of the piston, the integral bearing 7 and the cylinder 5. This applies an upward force on the piston to drive the piston upwardly of the cylinder.
  • the longitudinal spacing between the inlet ports 8 and 9 and the grooves 11 and 13 is such that the grooves 13 clear the ports 9 before the grooves 11 reach the ports 8 and when compressed air is shut-off from the piston.
  • the expansion of air in the chamber 16 and the inertia in the piston allows it to complete its return stroke.
  • the groove 11 reaches the ports 8 thereby allowing progressive application of compressed air to a chamber 17 formed between the piston, the cylinder and the diverter block 6.
  • a projection 18 on the diverter block enters into a central bore 19 through the piston and the then sealed chamber 17 allows the further compression of air in the cylinder to cushion the end of the return stroke and prevent the piston from striking the diverter block 6.
  • the piston is then primed for the drive stroke and the compressed air together with the inertia of the piston drives the piston downwards until the groove 11 clears the ports 8 thereby shutting-off the supply of compressed air to the chamber 17. This occurs before the groove 13 has reached the ports 9 when again compressed air supply is shut-off from the piston, the expansion of air in the chamber 17 and the interia of the piston allowing it to complete its drive stroke.
  • the groove 13 firstly overlaps the ports 9 and then becomes aligned with the ports 9 to allow the progressive appication of compressed air through the passageways 14 to the chamber 16 by when the projection 15 on the piston has entered the sealing bearing 7, allowing the further compression of air in the now sealed chamber 16 to cushion the piston as it approaches the end of its drive stroke but not to such an extent as would prevent the end of the projection 15 from striking the end of the drill bit 4.
  • the projection 18 on the diverter block 6 clears the bore 19 through the piston allowing the release of compressed air through the bore 19 through an aligned bore 20 in the drill bit and out into the bore hole. This not only permits the start of the return stroke but also has the effect of clearing debris from around the drill bit and encouraging the passage of debris up the bore hole to the outside of the wear tube.
  • the relationship between the total area provided by the ports 8 and the ports 9 in relationship to the annular gap between the cylinder and the wear tube is important for optimum effect but is not critical. What is most important is that the length in the longitudinal direction and the area of the ports 8 are greater than those of the ports 9. This is to allow a greater and more prolonged application of compressed air to the chamber 17 than to the chamber 16 because of the greater surface area of piston that has to be acted on by compressed air at that end.

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Valve Device For Special Equipments (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
EP82304174A 1981-12-10 1982-08-06 Foreuse à percussion Expired EP0081897B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82304174T ATE19130T1 (de) 1981-12-10 1982-08-06 Schlagbohrmaschine.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8137261 1981-12-10
GB8137261 1981-12-10

Publications (2)

Publication Number Publication Date
EP0081897A1 true EP0081897A1 (fr) 1983-06-22
EP0081897B1 EP0081897B1 (fr) 1986-04-09

Family

ID=10526521

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82304174A Expired EP0081897B1 (fr) 1981-12-10 1982-08-06 Foreuse à percussion

Country Status (3)

Country Link
EP (1) EP0081897B1 (fr)
AT (1) ATE19130T1 (fr)
DE (1) DE3270411D1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5662180A (en) * 1995-10-17 1997-09-02 Dresser-Rand Company Percussion drill assembly
US5957220A (en) * 1995-10-17 1999-09-28 Dresser-Rand Company Percussion drill assembly
US6873885B2 (en) 2000-03-29 2005-03-29 Campagnolo S.R.L. System for data transfer, for example for cycles such as competition bicycles
WO2023198568A1 (fr) * 2022-04-13 2023-10-19 Sandvik Mining And Construction Oy Manchon de protection pour ensemble de forage à percussion

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1509142A (fr) * 1966-11-30 1968-01-12 Forges Et Acieries Du Saut Dut Marteau pneumatique de forage muni d'un taillant
US3503459A (en) * 1968-07-29 1970-03-31 Mission Mfg Co Percussion drill motor
FR2140700A5 (fr) * 1969-10-07 1973-01-19 Frankfurter Pokorny Witt
US4030554A (en) * 1975-07-07 1977-06-21 Bakerdrill, Inc. Bore hole airhammer and anvil bit
US4084647A (en) * 1976-07-01 1978-04-18 William Lister Pneumatic percussion hammer
US4098352A (en) * 1976-12-17 1978-07-04 Kennametal Inc. Percussion bit with bypass channel therein
US4163478A (en) * 1978-09-15 1979-08-07 Adcock Gerald L Self aligning impact rock drilling tool
EP0040026A1 (fr) * 1980-05-09 1981-11-18 Halifax Tool Company Limited Machine à piston libre

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1509142A (fr) * 1966-11-30 1968-01-12 Forges Et Acieries Du Saut Dut Marteau pneumatique de forage muni d'un taillant
US3503459A (en) * 1968-07-29 1970-03-31 Mission Mfg Co Percussion drill motor
FR2140700A5 (fr) * 1969-10-07 1973-01-19 Frankfurter Pokorny Witt
US4030554A (en) * 1975-07-07 1977-06-21 Bakerdrill, Inc. Bore hole airhammer and anvil bit
US4084647A (en) * 1976-07-01 1978-04-18 William Lister Pneumatic percussion hammer
US4098352A (en) * 1976-12-17 1978-07-04 Kennametal Inc. Percussion bit with bypass channel therein
US4163478A (en) * 1978-09-15 1979-08-07 Adcock Gerald L Self aligning impact rock drilling tool
EP0040026A1 (fr) * 1980-05-09 1981-11-18 Halifax Tool Company Limited Machine à piston libre

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5662180A (en) * 1995-10-17 1997-09-02 Dresser-Rand Company Percussion drill assembly
US5957220A (en) * 1995-10-17 1999-09-28 Dresser-Rand Company Percussion drill assembly
US6873885B2 (en) 2000-03-29 2005-03-29 Campagnolo S.R.L. System for data transfer, for example for cycles such as competition bicycles
WO2023198568A1 (fr) * 2022-04-13 2023-10-19 Sandvik Mining And Construction Oy Manchon de protection pour ensemble de forage à percussion

Also Published As

Publication number Publication date
DE3270411D1 (en) 1986-05-15
ATE19130T1 (de) 1986-04-15
EP0081897B1 (fr) 1986-04-09

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