EP1138870A1 - Bohrhammeranordnung - Google Patents

Bohrhammeranordnung Download PDF

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Publication number
EP1138870A1
EP1138870A1 EP01302804A EP01302804A EP1138870A1 EP 1138870 A1 EP1138870 A1 EP 1138870A1 EP 01302804 A EP01302804 A EP 01302804A EP 01302804 A EP01302804 A EP 01302804A EP 1138870 A1 EP1138870 A1 EP 1138870A1
Authority
EP
European Patent Office
Prior art keywords
piston
wear sleeve
backhead
assembly
wall
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.)
Withdrawn
Application number
EP01302804A
Other languages
English (en)
French (fr)
Inventor
Bernard Lionel Gien
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1138870A1 publication Critical patent/EP1138870A1/de
Withdrawn legal-status Critical Current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 a drill hammer assembly and more particularly to a drill hammer assembly for a down the hole rock drill.
  • a down the hole drill hammer assembly comprising a backhead fitted into a wear sleeve, a piston forming the hammer reciprocable in the wear sleeve and a drill bit assembly including a foot valve tube and an anvil of smaller surface area than the hammer end of the piston located in the end of the wear sleeve remote from the backhead characterised in that the piston has blind bores extending from each end and ports through the wall of the piston providing for communication between the blind bores, a collar around the piston and the piston having a diameter at the hammer end larger than the backhead end, the backhead including an axial inlet passage and branched outlet passages through the wall of the backhead, longitudinal passages in the inner wall of the wear sleeve to provide selectively flow paths from the inlet to the upwardly exposed surfaces of the piston or alternatively to the upper surface of the collar and the drill bit end of the piston around the anvil with exhaust passages through the piston and communicating externally of the piston between the blind
  • the invention also provides for the bit assembly to be fitted in conventional manner to be axially movable in sealing engagement with the bottom end of the wear sleeve.
  • FIG. 1 shows a longitudinal cross-section of down-the-hole drill assembly.
  • the drill assembly consists of a backhead (1) with an axial inlet passage controlled by a check valve (2).
  • the backhead fits into a wear sleeve (3) forming a cylinder within which a piston (4) can reciprocate.
  • Entry ports (5) extend through the wall of the backhead (1) and open into longitudinal passages (6) in the wall of the wear sleeve (3).
  • the passages (6) open at their operatively lower ends into an annular chamber (7) around the piston (4).
  • the lower end of chamber (7) is enlarged at (8) and accommodates a collar (9) on the piston (4).
  • the bottom end (12) of the piston (4) provides the hammer face and a foot valve tube (13) extends from a drill bit assembly (14) into a blind bore (15) in the piston (4) in one direction and through the drill bit (14A) at the other.
  • the drill bit assembly (14) is mounted in the bottom of the wear sleeve in a conventional manner which maintains the bit in sealing engagement with the wall of the wear sleeve and provides limited relative axial movement between the bit assembly and wear sleeve.
  • passages (6) extend downwardly from the chamber (7) as passages (19) between the hammer end of the piston (4) and the wall of the wear sleeve (3). These passages terminate in chamber (20) where fluid pressure can act on the inclined outer surface of the end of the piston (4) around the anvil end of the bit.
  • the drill bit assembly (14) provides around the foot valve tube (13) an annular anvil (21) for the piston (4).
  • Ports (22) are provided so that passage (6) can communicate with a chamber 23) formed between the upper end of the piston (4) and the internal wall (24) of the backhead (1).
  • the chamber (7) is at all times during operation of the hammer in fluid communication with the inlet through check valve (2) and passages (6).
  • the ports (22) can be closed or opened by movement of the piston (4) within the wear sleeve.
  • the shoulder (9) on the piston can selectively open or close the flow path from the chamber (7) through the enlargement (8).
  • compressed air enters the backhead (1) and opens the check valve (2) permitting flow through ports (5).
  • the air then enters the passages (6) and flows into chamber (7).
  • Chamber (7) is always full of compressed air from the supply.
  • the air then flows past shoulder (9) on the piston (4) via enlargement (8) in the wear sleeve and into the bottom chamber (20).
  • the compressed air acts on the bottom annular surface of the piston and lifts the piston away from the drill bit assembly (14) in its upward stroke.
  • the shoulder (9) on the piston closes the bottom end of chamber (7) in the wear sleeve and shuts the flow of the compressed air to chamber (20).
  • the compressed air in chamber (20) keeps expanding until the hammer end (12) of the piston passes the end of the foot valve tube (13)
  • the air in chamber (20) then exhausts down the bore (13) of the bit and out to the atmosphere.
  • the piston (4) continues in its upward travel until ports (18) line up with ports (22).
  • the compressed air from ports (5) and passage (6) enters the top chamber (16) and acts on the surface area of the whole upper blind bore (16).
  • blind bore (16) and upper surface (10) of shoulder (9) combine to make up the full surface area of the bore of the wear sleeve without a loss of the surface area of the bore in the piston, as in conventional hammers.
  • Surface (10) is always under pressure since chamber (7) does not exhaust during the cycle.
  • the piston (4) now starts the movement towards the bit in its power stroke.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
EP01302804A 2000-03-27 2001-03-27 Bohrhammeranordnung Withdrawn EP1138870A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA200000509 2000-03-27
ZA200000509 2000-03-27

Publications (1)

Publication Number Publication Date
EP1138870A1 true EP1138870A1 (de) 2001-10-04

Family

ID=25588604

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01302804A Withdrawn EP1138870A1 (de) 2000-03-27 2001-03-27 Bohrhammeranordnung

Country Status (2)

Country Link
EP (1) EP1138870A1 (de)
CA (1) CA2342140A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1462604A2 (de) 2003-03-25 2004-09-29 Bernard Lionel Gien Bohrwerkzeug im Bohrloch

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7284882B2 (en) 2005-02-17 2007-10-23 Federal-Mogul World Wide, Inc. LED light module assembly

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3692122A (en) * 1970-12-23 1972-09-19 Baker Oil Tools Inc High frequency pneumatically actuated drilling hammer
US3804181A (en) * 1972-03-29 1974-04-16 Baker Oil Tools Inc Bore hole for hammer drive mechanism
US4094366A (en) * 1975-10-02 1978-06-13 Abraham Gien Pneumatic percussion machines
US5080179A (en) * 1988-06-15 1992-01-14 P. G. Drilling Equipment & Accessories Down the hole hammer equipment
EP0851091A2 (de) * 1996-12-17 1998-07-01 TERRA AG fuer Tiefbautechnik Imlochhammer
WO1999057411A1 (en) * 1998-05-04 1999-11-11 Permon S.R.O. Pneumatic submersible boring tool

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3692122A (en) * 1970-12-23 1972-09-19 Baker Oil Tools Inc High frequency pneumatically actuated drilling hammer
US3804181A (en) * 1972-03-29 1974-04-16 Baker Oil Tools Inc Bore hole for hammer drive mechanism
US4094366A (en) * 1975-10-02 1978-06-13 Abraham Gien Pneumatic percussion machines
US5080179A (en) * 1988-06-15 1992-01-14 P. G. Drilling Equipment & Accessories Down the hole hammer equipment
EP0851091A2 (de) * 1996-12-17 1998-07-01 TERRA AG fuer Tiefbautechnik Imlochhammer
WO1999057411A1 (en) * 1998-05-04 1999-11-11 Permon S.R.O. Pneumatic submersible boring tool

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1462604A2 (de) 2003-03-25 2004-09-29 Bernard Lionel Gien Bohrwerkzeug im Bohrloch

Also Published As

Publication number Publication date
CA2342140A1 (en) 2001-09-27

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