GB484213A - Improvements in or relating to pneumatic percussive tools - Google Patents
Improvements in or relating to pneumatic percussive toolsInfo
- Publication number
- GB484213A GB484213A GB3005836A GB3005836A GB484213A GB 484213 A GB484213 A GB 484213A GB 3005836 A GB3005836 A GB 3005836A GB 3005836 A GB3005836 A GB 3005836A GB 484213 A GB484213 A GB 484213A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- cylinder
- piston
- air
- chamber
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
- B25D9/14—Control devices for the reciprocating piston
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
Abstract
484,213. Valve - gear for percussive tools. BROOM & WADE, Ltd., and BROOM, H. Nov. 4, 1936, No. 30058. [Class 122 (ii)] In a pneumatic tool, particularly a pneumatic road breaker, with a plate distributing- valve and a pair of co-operating cylinders of different diameters, a plate valve of annular form works in an annular chamber surrounding the head of the cylinder of smaller diameter, controls the admission, and is operated by fluid pressure. The piston has two heads 7, 3 separated by a reduced portion 8. The lower head 3 controls the exhaust 6 towards the bottom of the cylinder. Blocks 12, 13 with a liner through which the small piston passes are spaced above the cylinder 9 and are separated by rings 14, 15. The space 16 houses a ring- shaped, plate, lift valve 17. A chamber 18 to which air is supplied by a lever-operated, spring- pressed valve 20, is arranged above the cylinder. Passages 24, 25 in the block 13 supply air to the spaces between the blocks. The space 16 is connected to the forward cylinder-end passage 28 by a V-shaped conduit 26. Similarly a V-shaped conduit in the lower ring 12 connects the space between the rings 13, 14 and the chamber 16. Further valve-controlled conduits 31, 32 extend from the chamber 16 to the lower cylinder. A conduit extends from below the rings 14, 15 to a groove in the cylinder 9. When air is supplied to the piston placed as shown in the Figure, the piston is raised until the exhaust is again opened. The cylinder compression raises the valve. Air then acts upon the small end and the annular area of the piston and effects the power stroke. When the lower end of the piston 7 passes above the groove 38, air passes by grooves 24, 33, 34 to the cylinder 5 to assist the stroke. When the exhaust 6 is opened, the valve is reversed. In a modification, the valve moves oppositely relative to the piston to that shown. The cylinder 9 has another groove communicating with the lower side of the valve so that fluid is passed to the lower side of the piston to build up pressure to effect the reversal before the end of the power stroke. The valve and seat may be of curved or conical formation.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3005836A GB484213A (en) | 1936-11-04 | 1936-11-04 | Improvements in or relating to pneumatic percussive tools |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3005836A GB484213A (en) | 1936-11-04 | 1936-11-04 | Improvements in or relating to pneumatic percussive tools |
Publications (1)
Publication Number | Publication Date |
---|---|
GB484213A true GB484213A (en) | 1938-05-03 |
Family
ID=10301570
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3005836A Expired GB484213A (en) | 1936-11-04 | 1936-11-04 | Improvements in or relating to pneumatic percussive tools |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB484213A (en) |
-
1936
- 1936-11-04 GB GB3005836A patent/GB484213A/en not_active Expired
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