Apparatus for generating impacts

Tool driving or impacting – Impacting devices – Hammer head constitutes piston of drive motor

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173 13, 173204, 173131, 173212, 91278, 91300, B25D 918

Patent

active

057525714

ABSTRACT:
An apparatus for generating impacts which has a hydraulic cylinder and a reciprocating piston. The hydraulic cylinder has an impact chamber, a cavity which receives and diverts fluid, and a throat which connects the impact chamber with the cavity. When the pressure line is connected to the cavity, the piston is lifted to an upper position. When the overflow line is connected to the cavity, the piston drops down such that the piston enters and covers the throat at the impact chamber. The pressure in the chamber remains low as the chamber is sealed by the piston entering the throat, where the energy loss is insignificant. The piston enters into the throat such that it is stopped and presses against the fluid inside the impact chamber, and thereby generates an impact therein. The piston is lifted up to repeat the cycle, when the cavity is connected to the pressure line. When the fluid inside the chamber is pressed by the piston, the impact is produced in the chamber and the volume of height reduction determines the volume of deceleration and the force of impact. The volume of height reduction is determined by the chamber working capacity. To increase the power of the impact, an inertia mass is attached to the piston.

REFERENCES:
patent: 3612188 (1971-10-01), Ono
patent: 4563938 (1986-01-01), Henriksson
patent: 5065824 (1991-11-01), Ottestad
patent: 5088565 (1992-02-01), Evarts
patent: 5107934 (1992-04-01), Atchison
patent: 5117924 (1992-06-01), Bermingham
patent: 5129466 (1992-07-01), Bartels et al.
patent: 5520254 (1996-05-01), Weber

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