Rock drills

Details Rock drills Rock drills

1982-07-21

1984-12-11

Yost, Frank T.

Tool driving or impacting

Impacting devices

Impact transmitting anvil

173116, E21C 324

Patent

active

044872747

ABSTRACT:
A rock drill is provided including a flap valve allowing high cutting speed operation over a range of compressed air pressures. The rock drill further includes a wear sleeve secured to a back head with a chuck to the opposite side, an inner cylinder within the wear sleeve, a valve seat at the inner end of the cylinder with a valve stem extending into the cylinder, and a piston within the cylinder reciprocable from one position where the valve stem engages a bore in the piston to a position where the stem enters a bearing in the cylinder to strike a drill bit held by the chuck. The ratio of the piston head area to its bore area is 9.9/9.95 to 1. The ratio of the piston head length to the stem length is 1.5/1.52 to 1. The ratio of piston head diameter to stem diameter is 1.4/1.43 to 1 and the ratio of piston stem length to the length of stem within the bearing at the point at which the piston strikes the bit is 1.4/1.45 to 1.

REFERENCES:
patent: 2837317 (1958-06-01), Hulshizer
patent: 2922626 (1960-01-01), Sutliff
patent: 2937619 (1960-05-01), Kurt
patent: 3164214 (1965-01-01), Oelke
patent: 3991835 (1976-11-01), Bailey et al.
patent: 4133393 (1979-01-01), Richards
patent: 4312412 (1982-01-01), Pillow

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