Trench hewing tool assembly with cutter guard attachment

Details Trench hewing tool assembly with cutter guard attachment Trench hewing tool assembly with cutter guard attachment

1980-12-11

1982-09-14

Purser, Ernest R.

Mining or in situ disintegration of hard material

Miscellaneous

37142A, 407115, E21C 3518

Patent

active

043492320

ABSTRACT:
A trench hewing tool assembly comprises a cutting blade holder having a shank receiving opening and at least one retaining recess, a cutting blade having a shank disposed in the shank receiving opening, the shank having an inclined wall recess on one side thereof, and a cutting edge member connected to the cutting blade facing a hewing direction. A tapered clamping bolt is connected to the holder and spring loaded toward the blade shank to engage an inclined wall of the inclined wall recess to retain the blade in the holder. A projection is provided on the holder which is spaced from the cutting blade and a guard member has lateral legs which straddle the projection. The guard member includes at least one claw which is engaged on the retaining recess of the holder and has a locking groove in which is received the blade. The guard is held between the blade and the holder. The guard includes projections on either side of the blade receiving groove for guarding the holder and also for widening a cut made by the tool assembly in a lateral direction to prevent jamming of the holder.

REFERENCES:
patent: 2872172 (1959-02-01), Fitzgerald
patent: 3778112 (1973-12-01), Krekeler
patent: 3834764 (1974-09-01), Krekeler
patent: 3856359 (1974-12-01), Krekeler

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