专利名称：Pile driver and extractor 发明人：Dionizy Simson
申请号：US06/652011
申请日：19840919
公开号：US04650008A
公开日：
19870317
专利内容由知识产权出版社提供
摘要：A driving and extracting apparatus has a hammer frame within which a reaction mass is freely movable. The reaction mass is caused to reciprocate within the hammer frame by the selective application of drive pressure to opposite drive cylinders at a frequency corresponding to the natural frequency of the mass. A pneumatic spring at each end of the reaction mass prevents contact between the reaction mass and the ends of the hammer frame. Sensors in the hammer frame detect the position of the reaction mass and adjust the pneumatic springs accordingly.
reaction mass申请人：SIMSON & PARTNER
代理机构：Oblon, Fisher, Spivak, McClelland & Maier
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