Hydropneumatic percussive tool

Tool driving or impacting – Impacting devices – Impact transmitting anvil

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Details

173116, 173125, B25D 900

Patent

active

045053405

ABSTRACT:
A vibration or reciprocating hydraulically driven impact tool for breaking up paving, compacting soil, or similar construction purposes. The tool employs a piston situated in a housing and configured to form (in cooperation with the housing) three chambers. One of the chambers is filled with a compressed gas which acts as a shock absorber/spring, with the other two chambers serving to drive adjacent flanges of the piston in opposite directions to provide reciprocating action. The device is constructed so that when no mechanical force is applied to the handle, the piston is at rest in its forward position (being urged there by the compressed gas), with the hydraulic forces acting upon the piston shoulders being balanced. When the handle is pushed forward, the hydraulic system is altered so that unbalanced forces act on the piston flanges, causing the piston to start moving. Thereafter, a hydraulic valve system provides the desired reciprocating motion of the piston.

REFERENCES:
patent: 1807787 (1931-06-01), Jimerson
patent: 3250334 (1966-05-01), Sussman
patent: 3741316 (1973-06-01), Alajouanine
patent: 3805896 (1974-04-01), Bauer
patent: 3872934 (1975-03-01), Terada
patent: 4034817 (1977-07-01), Okada
patent: 4187917 (1980-02-01), Bouyoucos
patent: 4349075 (1982-09-01), Henriksson

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