EP1138870A1 - Bohrhammeranordnung - Google Patents
Bohrhammeranordnung Download PDFInfo
- 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- Withdrawn
Links
- 238000007789 sealing Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 abstract description 8
- 238000010276 construction Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 1
Images
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)
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)
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)
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)
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 |
-
2001
- 2001-03-27 CA CA 2342140 patent/CA2342140A1/en not_active Abandoned
- 2001-03-27 EP EP01302804A patent/EP1138870A1/de not_active Withdrawn
Patent Citations (6)
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)
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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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
AX | Request for extension of the european patent |
Free format text: AL;LT;LV;MK;RO;SI |
|
17P | Request for examination filed |
Effective date: 20020321 |
|
AKX | Designation fees paid |
Free format text: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
17Q | First examination report despatched |
Effective date: 20050217 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20050628 |