ATE19130T1 - IMPACT DRILL. - Google Patents

IMPACT DRILL.

Info

Publication number
ATE19130T1
ATE19130T1 AT82304174T AT82304174T ATE19130T1 AT E19130 T1 ATE19130 T1 AT E19130T1 AT 82304174 T AT82304174 T AT 82304174T AT 82304174 T AT82304174 T AT 82304174T AT E19130 T1 ATE19130 T1 AT E19130T1
Authority
AT
Austria
Prior art keywords
piston
bit
tube
cylinder
drills
Prior art date
Application number
AT82304174T
Other languages
German (de)
Inventor
John Arthur Hurt
Original Assignee
Weaver & 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 & Hurt Ltd filed Critical Weaver & Hurt Ltd
Application granted granted Critical
Publication of ATE19130T1 publication Critical patent/ATE19130T1/en

Links

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

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)

Abstract

The invention relates to percussive drills for earth boring, and particularly to so-called valveless drills. In such drills it is important to allow, cyclically, compressed air to pass into the bore hole to clear debris through a central hole in the bit which central hole needs to be closed to allow the return stroke of the piston. This has been provided for hitherto by a short tube usually of plastics material, secured to the innermost end of the bit so that as the piston approaches the bit on the drive stroke the tube engages in a counterbore in the piston to seal the bore through the bit. Such short tubes are frequently damaged causing cessation of operation of the drill whilst down the hole, a circumstance that is to be avoided. The objective of the invention is to avoid the above disadvantage, which objective is met by a construction comprising an outer wear tube (1), compressed air inlet means (2) to one end of the wear tube, chuck means (3) for holding a drill bit (4) to the opposite end of the wear tube, a cylinder (5) located within the wear tube with an annular gap therebetween, an air diverter (6) located at the end of the cylinder towards the air inlet, a sealing bearing (7) located at the end of the cylinder towards the chuck, and a piston (10) within the cylinder, said piston having a portion (15) of reduced diameter adapted to pass through the sealing bearing to strike a bit held in the chuck, and there being porting (8, 9) to direct air to one side or the other of the piston to provide a drive and a return stroke.
AT82304174T 1981-12-10 1982-08-06 IMPACT DRILL. ATE19130T1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8137261 1981-12-10
EP82304174A EP0081897B1 (en) 1981-12-10 1982-08-06 Percussive drills

Publications (1)

Publication Number Publication Date
ATE19130T1 true ATE19130T1 (en) 1986-04-15

Family

ID=10526521

Family Applications (1)

Application Number Title Priority Date Filing Date
AT82304174T ATE19130T1 (en) 1981-12-10 1982-08-06 IMPACT DRILL.

Country Status (3)

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

Families Citing this family (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
IT1320289B1 (en) 2000-03-29 2003-11-26 Campagnolo Srl SYSTEM FOR THE TRANSFER OF DATA, FOR EXAMPLE FOR QUALIFYING CYCLES FOR COMPETITION.
WO2023198568A1 (en) * 2022-04-13 2023-10-19 Sandvik Mining And Construction Oy Protective sleeve for percussive drilling assembly

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1509142A (en) * 1966-11-30 1968-01-12 Forges Et Acieries Du Saut Dut Pneumatic drilling hammer equipped with a cutting edge
US3503459A (en) * 1968-07-29 1970-03-31 Mission Mfg Co Percussion drill motor
DE1950508C3 (en) * 1969-10-07 1975-01-09 Fma Pokorny Frankfurter Maschinenbau Ag, 6000 Frankfurt Compressed air-operated deep-hole drills
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 (en) * 1980-05-09 1981-11-18 Halifax Tool Company Limited Free piston machines

Also Published As

Publication number Publication date
DE3270411D1 (en) 1986-05-15
EP0081897B1 (en) 1986-04-09
EP0081897A1 (en) 1983-06-22

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Legal Events

Date Code Title Description
UEP Publication of translation of european patent specification
REN Ceased due to non-payment of the annual fee