Breaker bar

Details Breaker bar Breaker bar

1977-02-18

1979-02-13

Purser, Ernest R.

Mining or in situ disintegration of hard material

Miscellaneous

241273, E01C 2312, E21C 4710

Patent

active

041392370

ABSTRACT:
A breaker bar or drop hammer principally for breaking large rock into smaller pieces is disclosed. The bar is of a cast heat treatable material, preferably manganese steel, and is of a shape which permits effective heat treatment quenching for adequate strength. Preferred shapes for the one-piece breaker bar are easily cast and avoid thicknesses of over about eight inches in critical areas, so that quenching is effective to avoid deleterious thermal stress cracking and provide a structure of adequate strength.

REFERENCES:
patent: 2209619 (1940-07-01), Wilcox
patent: 2342498 (1944-02-01), Spang
patent: 2524589 (1950-10-01), Becker
patent: 3236510 (1966-02-01), O'Brien
patent: 3404847 (1968-10-01), Smith
patent: 3845893 (1974-11-01), Banjavich

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