Trenching tool assembly with dual indexing capability

Mining or in situ disintegration of hard material – Miscellaneous

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Details

37142R, 299 93, E21C 3518

Patent

active

050076850

ABSTRACT:
A trenching tool assembly with dual indexing capabilities includes a block formed with a tool shank bore and a cutter bit having a shank which is insertable into the tool shank bore. The shank includes a polygonal portion which is preferably a hex. An indexing washer is formed with a central opening shaped to engage the polygonal section of the cutter bit shank and to prevent relative rotation therebetween. The indexing washer engages the tool block in any one of a number of fixed positions. To change the angle of attack of the cutter bit, the indexing washer is disengaged from the tool block and cutter bit shank. The indexing washer and cutter bit shank can be indexed as a unit or independently of one another.

REFERENCES:
patent: D245910 (1977-09-01), van der Lely
patent: 933573 (1909-09-01), Newell
patent: 2487696 (1949-11-01), Coffing
patent: 2509285 (1950-05-01), Bendicsen
patent: 2593368 (1952-04-01), Verderber
patent: 4051903 (1977-10-01), van der Lely
patent: 4299424 (1981-11-01), LeBegue et al.
patent: 4316636 (1982-02-01), Taylor et al.
patent: 4552223 (1985-11-01), van der Lely
patent: 4727664 (1988-03-01), Hemphill

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