| 摘要 |
<p>PCT No. PCT/US79/00591 Sec. 371 Date Apr. 8, 1981 Sec. 102(e) Date Feb. 23, 1981 PCT Filed Aug. 8, 1979 PCT Pub. No. WO81/00460 PCT Pub. Date Feb. 19, 1981.A reaction mass and hydraulic cylinder assembly for a seismic transducer. A hydraulic biasing cylinder (76) is formed between a lower piston rod (32) and a reaction mass (44) and is located below a hydraulic drive cylinder (46). The lower piston rod (32) includes a first portion (36) and a detachable second portion (38-40), the detachable second portion forming an upward facing shoulder (42) which partially defines the hydraulic biasing cylinder (76). The hydraulic drive cylinder (46) is formed by a cylinder sleeve (48) and upper and lower cylinder bushings (50 and 52) having lower and upper ends (54 and 56), respectively, concentrically received within the cylinder sleeve (48) to define the upper and lower ends, respectively, of the hydraulic drive cylinder.</p> |
