Rock drill positioning mechanism

Details Rock drill positioning mechanism Rock drill positioning mechanism

1978-08-31

1981-09-22

Reynolds, Wm. Carter

Tool driving or impacting

Drive by means reacting to rotating eccentric mass

E21C 500, E21C 900

Patent

active

042904919

ABSTRACT:
A rotary actuator is pivotally mounted on the end of a drill boom and supports a rock drill feed bar for rotation about a longitudinal axis of the actuator. The rotary actuator includes a piston with a piston rod portion having external and internal helical splines engaged with cooperating splines on the actuator housing and a rotating shaft, respectively. The shaft is connected to the feed bar and is operable to rotate the feed bar in response to axial movement of the piston. The axis of rotation of the shaft may be coincident with the longitudinal axis of the drill boom. The drill boom is mounted on a rotary actuator for swinging movement about a vertical axis.

REFERENCES:
patent: 2491273 (1949-12-01), Lehner
patent: 3338316 (1967-08-01), Thompson
patent: 3381762 (1968-05-01), Lewis et al.
patent: 3563321 (1971-02-01), Barendsen et al.
patent: 3782484 (1974-01-01), Martin

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