초록 ▼

The non-impact pile driver of this invention comprises a mast mounted on a trailer chassis and a carriage guided by the mast for vertical motion along it and comprising a hydraulic ram with a downwardly projecting piston rod. The carriage is raised and controlledly lowered by means of a winch. Horiz

The non-impact pile driver of this invention comprises a mast mounted on a trailer chassis and a carriage guided by the mast for vertical motion along it and comprising a hydraulic ram with a downwardly projecting piston rod. The carriage is raised and controlledly lowered by means of a winch. Horizontally movable latch members on the carriage, operated by remotely controllable hydraulic actuators, engage abutments on the mast, at spaced intervals along it, to lock the carriage to the mast. Thus the carriage can be lowered in stages for driving a substantially long pile.

대표청구항 ▼

A non-impacting pile driver comprising a chassis having ground engaging means for resting on the ground, a mast secured to said chassis and defining a pair of laterally spaced opposite and upright guide rails, a carriage having opposite side portions slidingly engaged with said guide rails to be con

A non-impacting pile driver comprising a chassis having ground engaging means for resting on the ground, a mast secured to said chassis and defining a pair of laterally spaced opposite and upright guide rails, a carriage having opposite side portions slidingly engaged with said guide rails to be confined by them to vertical movement along said mast, a hydraulic ram comprising a cylinder fixed to said carriage with its axis upright and between said guide rails and a piston rod projecting downward from said cylinder that is axially extendable and retractable relative to the cylinder and the carriage through a stroke of predetermined length for exerting downward force upon a pile to be driven, and latch means for releasably locking the carriage to the mast at each of a plurality of locations that are spaced apart along the mast by a distances not greater than said predetermined length, said pile driver being characterized by: A. the cylinder of said hydraulic ram having (1) at its upper end an upper connection to the carriage that confines the upper end of the cylinder against lateral motion relative to the carriage and carries upward reaction force upon the cylinder into the carriage for transfer to the mast through said latch means, and (2) at its lower end a lower connection with the carriage which cooperates with said upper connection to confine the cylinder against all lateral motion relative to the carriage; B. the piston rod of said hydraulic ram having guide means fixed on its lower end, said guide means having (1) opposite end portions slidingly engaged with said guide rails to confine the piston rod against lateral deflection and (2) a pile engaging element on its underside engageable with the top end of a pile to be driven and arranged to confine the same against lateral displacement relative to the piston rod.