GB954885A - - Google Patents
Info
- Publication number
- GB954885A GB954885A GB954885DA GB954885A GB 954885 A GB954885 A GB 954885A GB 954885D A GB954885D A GB 954885DA GB 954885 A GB954885 A GB 954885A
- Authority
- GB
- United Kingdom
- Prior art keywords
- piston
- valve
- cylinder
- rod
- springs
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L23/00—Valves controlled by impact by piston, e.g. in free-piston machines
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Percussive Tools And Related Accessories (AREA)
- Earth Drilling (AREA)
Abstract
954,885. Percussive drills. DOWTY MINING EQUIPMENT Ltd. July 25, 1960 [May 11, 1959], No. 16085/59. Heading B4C. [Also in Division F1] In a pneumatic or hydraulic pressure reciproeating engine for supplying power to rock drills or hammers, a piston 3 slidable in a cylinder 2 has a piston-rod 4 extending through a sealed opening 5 in the cylinder for transmitting reciprocating energy, e.g. to the spring-loaded head 7 of a drill, and a sliding valve 14, 15, capable of oscillation with springs 21, 23 associated therewith, connects each end of the cylinder 2 alternately to fluid supply and return ports 24, 25 through fluid passages 28, 29 to cause reciprocation of the piston in accordance with oscillation of the valve, the piston being connected to the springs for transmitting reciprocating energy thereto to maintain the valve in oscillation whereby reciprocation of the piston is also maintained. As shown, the piston is formed with a recess 11 equal in diameter to the piston-rod diameter and sealingly engaging in the upper end of the cylinder 2 a projection 12 provided with a bore 13 forming the valve cylinder. Alternatively, the piston is provided with a hollow rod extending in a sealed manner in the casing 1 and connected to a valve cylinder. The valve rod 16 is formed with a head 19 and a shoulder 22 between which and a flange 18 in the piston bore the springs 21, 23 are compressed. In the position shown, the piston 3 is displaced slightly upwardly by a spring 8 acting on the drill head 7. To commence operation, pressure fluid is supplied through port 24 and passes through port 26 to piston 3 urging it downwardly. The piston will then start to oscillate at a frequency governed by the actual frequency of the valve and springs, reciprocating energy being transferred to the drill head 7 by impact. In a modification, inlet and return ports are provided respectively on the outside and between the lands 14, 15 of the valve and pressure fluid acts on the whole cross-section of the end of the piston opposed to the piston-rod.
Publications (1)
Publication Number | Publication Date |
---|---|
GB954885A true GB954885A (en) | 1900-01-01 |
Family
ID=1754170
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB954885D Expired GB954885A (en) |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB954885A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2429905A1 (en) * | 1978-06-28 | 1980-01-25 | Schrader Sa | Reciprocating linear hydraulic motor - has valve piston reversed by springs tensioned by main piston during each stroke |
EP0038360A1 (en) * | 1979-10-29 | 1981-10-28 | Oerlikon Buehrle Inc | Cryogenic apparatus. |
EP0038850A1 (en) * | 1979-10-29 | 1981-11-04 | Oerlikon Buehrle Inc | Valves for cryogenic refrigerators. |
-
0
- GB GB954885D patent/GB954885A/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2429905A1 (en) * | 1978-06-28 | 1980-01-25 | Schrader Sa | Reciprocating linear hydraulic motor - has valve piston reversed by springs tensioned by main piston during each stroke |
EP0038360A1 (en) * | 1979-10-29 | 1981-10-28 | Oerlikon Buehrle Inc | Cryogenic apparatus. |
EP0038850A1 (en) * | 1979-10-29 | 1981-11-04 | Oerlikon Buehrle Inc | Valves for cryogenic refrigerators. |
EP0038360A4 (en) * | 1979-10-29 | 1982-05-26 | Oerlikon Buehrle Inc | Cryogenic apparatus. |
EP0038850A4 (en) * | 1979-10-29 | 1982-05-28 | Oerlikon Buehrle Inc | Valves for cryogenic refrigerators. |
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