发明名称 Pneumatic hammer lift
摘要 An apparatus for lifting a pneumatic hammer from the hammer's work surface. A pneumatic lift attachment is provided having a support housing. Attached to the support housing is a lift plate, containing a guide hole and an adjustable chain, for securing a pneumatic hammer to the lift plate. Defined within the housing is an air cylinder containing a piston having a piston rod. The piston is responsive to air supplied to the air cylinder, which drives the piston and piston rod downward. Attached to the bottom of the piston rod is a foot. As the foot meets the ground's surface, the support housing is lifted, freeing the attached hammer from the work surface.
申请公布号 US4986370(A) 申请公布日期 1991.01.22
申请号 US19890299317 申请日期 1989.01.19
申请人 JOHNSON, DECEASED, JOHN;JOHNSON, HEIRESS, BY HENRYKA 发明人 JOHNSON, DECEASED, JOHN;JOHNSON, HEIRESS, BY HENRYKA
分类号 B25D17/28;E21B19/086 主分类号 B25D17/28
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