Tool driving or impacting – Impacting devices – Hammer head constitutes piston of drive motor
Patent
1997-09-02
1998-09-15
Smith, Scott A.
Tool driving or impacting
Impacting devices
Hammer head constitutes piston of drive motor
173128, 173212, 173 13, 91300, B25D 902, E02D 700
Patent
active
058066101
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.
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patent: 5520254 (1996-05-01), Weber
Chen Tony D.
Rozsa Thomas I.
Smith Scott A.
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