Hydraulic and earth engineering – Foundation – Columnar structure
Patent
1987-06-26
1989-07-04
Taylor, Dennis L.
Hydraulic and earth engineering
Foundation
Columnar structure
173 81, 335290, 294 655, 405228, 405303, E02D 708
Patent
active
048446610
ABSTRACT:
This invention relates to a method and device for driving tools into the ground, comprising a chassis in which is slidably mounted an anvil connected by a set of rods to said tool and a hammer sliding in said chassis to strike the anvil, which device further comprises an electro-magnet mounted to slide in said chassis and above said hammer, which is connected to an electrical source as well as to lifting means for gripping the hammer by magnetic attraction after it has dropped on the anvil and to lift the hammer to the upper part of the chassis in order automatically to allow it to drop again by gravity onto said anvil, and in which the hammer comprises in its part opposite the one which comes into contact with the anvil a permanent magnet to increase the force of attraction of the hammer against the electro-magnet, or to create a force of repulsion by change of polarity of the electro-magnet in order to promote separation of the electro-magnet and the hammer and to communicate an initial velocity to said hammer.
REFERENCES:
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patent: 2224439 (1940-12-01), Lee
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patent: 3450274 (1969-06-01), Johansson
patent: 3859571 (1975-01-01), Strobl et al.
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Patent Abstracts of Japan, vol. 10, No. 10 (M-446) [2067], Jan. 16, 1986; & JP-A-60 173 217 (Yoshiji Kondou), 06-09-1985.
Patent Abstracts of Japan, vol. 10, No. 105 (M-471) [2162], Apr. 19, 1986; & JP-A-60 238 519 (Kakushin Kogyo K.K.), 27-11-1985.
Luong Minh P.
Martin Andre
Taylor Dennis L.
Technologies Speciales Ingenierie - T.S.I.
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