| 摘要 |
1536883 Hydraulic reciprocating motors NIPPON PNEUMATIC Mfg CO Ltd 9 March 1976 [18 March 1975] 09417/76 Heading F1A [Also in Division B4] Piston 3 is driven to strike chisel shank 7 by a gas spring 6 and returned by the application of highpressure oil to chamber 4 via input 15 and cavity 10 of valve-member 9. Low-pressure line 16 is connected permanently to chamber 5 and passage 18 containing valve body rod 17. Valve body 9 is moved rearwards to cut off the high-pressure oil flow to chamber 4 by the action of high-pressure oil on flange 20 in cavity 21. Branch passage 14 allows high-pressure oil to continue to act on flange 20 when large diameter piston portion 3 blocks an end of passage 13 during a drive stroke. Towards the end of the drive stroke passage 13 is connected via chamber 5 to low pressure and valve body 9 is moved forwards by rod 17. |
