Percussion tool

Details Percussion tool Percussion tool

1984-05-01

1985-07-09

Yost, Frank T.

Boring or penetrating the earth

With below-ground tool drive prime mover

173 78, 175413, 175418, E21B 1102, E21C 1306

Patent

active

045276412

ABSTRACT:
In a percussion tool for rock drilling there is used in place of the conventional, large bore crown a hammer body (18) carrying a great number of interchangeable small bore crowns (26a,26b). The impact of a hammer piston (22) is transferred to the hammer body (18) which contains a radially projecting thicker head (25) to which the bore crowns (26a,26b) are secured. If individual bore crowns are worn or damaged, they can be interchanged individually. Moreover, the bore crowns can be rotated so as to position corresponding other hard metal elements (33) into the marginal area of the percussion tool.

REFERENCES:
patent: 1717271 (1929-06-01), Simmons
patent: 1814296 (1931-07-01), Dean
patent: 3260319 (1966-07-01), Conover
patent: 3342532 (1967-09-01), Krekeler
patent: 3726533 (1973-04-01), Lafferty, Sr.
patent: 3841708 (1974-10-01), Kniff et al.
patent: 4222446 (1980-09-01), Vasek
patent: 4321974 (1982-03-01), Klemm

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