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Class Information
Number: 405/246
Name: Hydraulic and earth engineering > Foundation > Columnar structure (e.g., pier, pile) > Process or apparatus for installing > Driving removable wall supporting core > Diametrically retractable core
Description: Method or apparatus in which the core is adapted to be readily reduced in diameter to facilitate removal or insertion of the core from or into the hollow shell.

Sub-classes under this class:

Class Number Class Name Patents
405/247 Fluid pressure actuated 6

Patents under this class:

Patent Number Title Of Patent Date Issued
7736095 Pile assembly for engineering and construction works Jun. 15, 2010
6582158 Device and method for transferring vibrating movement to rigid pipe with pipe clamp for vibrator rammer block Jun. 24, 2003
5310287 Method and device for driving a pile or the like into and out of the ground May. 10, 1994
5030034 Soil pollution monitoring system and apparatus Jul. 9, 1991
4701077 Apparatus for withdrawing a tube or pile which has been driven into the soil Oct. 20, 1987
4616958 Retraction assemblies for expansible mandrels Oct. 14, 1986
4074539 Expansible mandrel with an external, cable actuating winch Feb. 21, 1978
4057970 Rotary fluid supply joints for expansible mandrels Nov. 15, 1977
4050731 Shifting apparatus Sep. 27, 1977
4036025 Composite pile having the inside diameter of the tip less than that of the pile and mandrel for driving the same Jul. 19, 1977
4026117 Expansible mandrel May. 31, 1977

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