| 摘要 |
PCT No. PCT/SE89/00072 Sec. 371 Date Sep. 14, 1990 Sec. 102(e) Date Sep. 14, 1990 PCT Filed Feb. 22, 1989 PCT Pub. No. WO89/07511 PCT Pub. Date Aug. 24, 1989.An apparatus with two limit positions and generating a reciprocating motion, comprises a first moving part (4a, 4b) and a second moving part (16a, 16b) between which parts (4a, 4b; 16a, 16b) a pressurized drive medium (38a, 38b) such as compressed air, is disposed to simultaneously displace the moving parts (4a, 4b; 16a, 16b) in mutually opposite directions. At least the first moving part (4a, 4b) is actuated, by a constantly present force, for example by the pressure of the driving media (38a, 38b) applied on at least one surface of the first moving part (4a, 4b), in the forward direction under tensioning of an associated force accumulator (20a), for example a spring. The pressurized drive medium (38a, 38b) is also applied between the first and second moving parts (4a, 4b; 16a, 16b) such that the second moving part (16a, 16b) is disposed, in the forward direction, to tension an associated force accumulator (19a, 19b) under simultaneous cancelling of the load on the force accumulator (20a) associated with the first moving part (4a, 4b). |
