Patent ID: 6102133
Filing Date: 2000-08-15
Classification: E02D

Abstract:
A pile hammer having at least two modes of continuous operation comprising a cylinder, a hammering piston guided in the cylinder and hammering member guided in the lower end portion of the cylinder, a lower end face of the hammering piston forming an upper axial end wall, an upper face of the hammering member forming a lower axial end wall and the cylinder forming a circumferential wall of a variable working space, at least two different controllable working gas supply units and activating means to selectively activate each one of said controllable working gas supply units to intermittently pressurize the working space for continuous hammering operation of said hammering member by each of said different working gas supply units, wherein said working gas supply units differ by at least one parameter selected from the group consisting of pressure of the working gas and response in time of the pressure of the working gas supplied by a working gas supply unit after having received an activating signal from said activating means.