Fluid actuated rock drill hammer

Details Fluid actuated rock drill hammer Fluid actuated rock drill hammer

1984-08-31

1989-04-11

Yost, Frank T.

Tool driving or impacting

Drive controlled by relative axial movement of tool

Drive motor controlled

173 73, 173 80, B23Q 500

Patent

active

048197394

ABSTRACT:
An improved fluid actuated rock drill hammer as shown having a cylinder housing, a reciprocal piston, and a centralized air distributing control tube axially extending through a central bore in the piston for controlling the operation of the piston. The control tube is mounted for assured concentricity of the tube within the piston bore and comprises a unitary mounting portion and tubular portion. The mounting portion includes a piloting section for concentric fit within the cylinder as received on a shoulder therein and the tubular portion extends concentric and perpendicular to the piloted section.

REFERENCES:
patent: 2887989 (1959-05-01), Dulaney
patent: 3598187 (1971-08-01), Mothne
patent: 3826316 (1974-07-01), Bassinger
patent: 4084646 (1978-04-01), Kurt
patent: 4312412 (1982-01-01), Pillow
patent: 4333537 (1982-06-01), Harris et al.

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