Pneumatic drill

Details Pneumatic drill Pneumatic drill

1990-08-13

1991-08-20

Yost, Frank T.

Tool driving or impacting

Impacting devices

With means for rotating tool

173134, 173163, B25D 918

Patent

active

050406183

ABSTRACT:
A pneumatic rock drill which has a pneumatic percussion unit with a piston which slidably engages the cylinder in which it reciprocates. Preferably clearances of less than less than about 0.00125 inches per inch of piston diameter and greater than about 0.00075 inches where clearances are diameter are maintained to assure a fluid film between the piston and the cylinder wall. The clearances are based on diameters. The piston of the pneumatic drill has at least one stem section which slidably engages a distributor.
The rock drill has a pneumatic motor connected to the percussion unit and engages a distributor of the percussion unit. A air motor gear in the pneumatic motor is rotatably mounted on the distributor.
The exhaust is employed to lubricate the bearings and gearing which turn the striker bar.

REFERENCES:
patent: 3858666 (1975-01-01), Bailey et al.
patent: 3991835 (1976-11-01), Bailey et al.
patent: 4304410 (1981-12-01), Erickson et al.
patent: 4340121 (1982-07-01), Bailey et al.
patent: 4846051 (1989-07-01), Wade et al.
patent: 4957171 (1990-09-01), Morrison et al.

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