Cracking device

Details Cracking device Cracking device

1989-05-04

1990-06-05

Reese, Randolph A.

Tool driving or impacting

Impacting devices

With means to cause or control advance of hammer head

91300, 173133, 37DIG18, B25D 918

Patent

active

049305840

ABSTRACT:
A cracking device for use in a dredger includes a housing body having an elongated cavity receiving an elongated piston and a hammer rod to be struck by the piston. The cavity forms a gas chamber around a top end of the piston for receiving an operating gas, an annular hydraulic chamber around the piston adjacent to the annular flange, and an impact chamber around a bottom end of the piston and around a top end of the hammer rod. The hydraulic chamber is divided into two variable volume upper and lower chambers by an annular flange of the piston. A passage is provided in the body to permit a hydraulic fluid to operate in the hydraulic chamber through the passage. A hydraulically operated control valve is connected to the passage and the hydraulic chamber for controlling the operation of the hydraulic fluid.

REFERENCES:
patent: 4230019 (1980-10-01), Castan
patent: 4646854 (1987-03-01), Arndt et al.
patent: 4784228 (1988-11-01), Ito
patent: 4817737 (1989-04-01), Hamada et al.

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