DE3362163D1 - Rock drills - Google Patents
Rock drillsInfo
- Publication number
- DE3362163D1 DE3362163D1 DE8383200711T DE3362163T DE3362163D1 DE 3362163 D1 DE3362163 D1 DE 3362163D1 DE 8383200711 T DE8383200711 T DE 8383200711T DE 3362163 T DE3362163 T DE 3362163T DE 3362163 D1 DE3362163 D1 DE 3362163D1
- Authority
- DE
- Germany
- Prior art keywords
- piston
- stem
- ratio
- length
- range
- 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
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
Abstract
The invention relates to rock drilling equipment particularly of the down-the-hole type. More particularly the invention relates to such drills incorporating a flap valve. Hitherto such drills have been designed to operate at a particular air pressure with the disadvantage that if on a particular site the compressed air availability does not suit the drill, its effectiveness is impaired. It is equally the case that conventional rock drills of the type in question operate at a relatively low cutting speed calculated on a feet per minute basis. The object of the invention is to provide a rock drill capable of considerably higher cutting speeds than has hitherto been possible and which is capable of operation over a range of air pressures. The objective is met by a construction comprising a backhead for the connection of a drill to a source of compressed air, a wear sleeve secured to the backhead and a chuck adapted to retain a drill bit secured to the opposite end of the wear sleeve, there being within the wear sleeve an inner cylinder with a valve seat at one (inner) end of the cylinder having a valve stem extending into the cylinder and a piston within the cylinder reciprocable therein from one position where the valve stem engages in a bore in the piston to a second position where a stem on the piston enters a bearing located in the cylinder and strikes a drill bit held within the chuck, the dimensions of the piston being such that the ratio of the piston head diameter to its bore diameter is in the range 9.9/9.95 to 1, the ratio of the piston head length to the piston stem length is in the range 1.5/1.52 to 1, the ratio of the piston head diameter to the piston stem diameter is in the range 1.4/1.43 to 1 and the ratio of the piston stem length to the length of the piston stem within the bearing at the point at which the piston strikes the drill bit is 1.4/1.45 to 1. It is further highly desirable that the rock drill has a valve seat wherein the ratio of the cross-sectional area of the part of the valve seat within the cylinder to the cross-sectional area of the stem of the valve seat is in the range 0.09/0.10 to 1, the ratio of the stroke length of the piston to the length of the stem of the valve seat is 0.87/0.88 to 1 and the ratio of the net internal length of the bearing to the stroke length of the piston is in the range 0.56/0.57 to 1.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8221377 | 1982-07-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE3362163D1 true DE3362163D1 (en) | 1986-03-27 |
Family
ID=10531869
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE8383200711T Expired DE3362163D1 (en) | 1982-07-23 | 1983-05-19 | Rock drills |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0099594B1 (en) |
AT (1) | ATE18082T1 (en) |
CA (1) | CA1203728A (en) |
DE (1) | DE3362163D1 (en) |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3085555A (en) * | 1960-05-31 | 1963-04-16 | Ingersoll Rand Co | Pneumatic hammer rock drill |
BE637490A (en) * | 1962-09-17 | |||
AU522224B2 (en) * | 1975-01-13 | 1982-05-20 | Abraham Gien | Percussion drill piston |
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 |
EP0043291B1 (en) * | 1980-07-01 | 1985-05-02 | Greame Rear Ian | Improved fluid operated hammer |
ZA816261B (en) * | 1980-09-11 | 1982-09-29 | Ian Graeme Rear | Fluid operated hammer |
-
1983
- 1983-05-19 EP EP83200711A patent/EP0099594B1/en not_active Expired
- 1983-05-19 AT AT83200711T patent/ATE18082T1/en not_active IP Right Cessation
- 1983-05-19 DE DE8383200711T patent/DE3362163D1/en not_active Expired
- 1983-05-30 CA CA000429188A patent/CA1203728A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
EP0099594A3 (en) | 1984-04-25 |
EP0099594B1 (en) | 1986-02-19 |
EP0099594A2 (en) | 1984-02-01 |
CA1203728A (en) | 1986-04-29 |
ATE18082T1 (en) | 1986-03-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8364 | No opposition during term of opposition | ||
8339 | Ceased/non-payment of the annual fee |