Double acting bit holder

Details Double acting bit holder Double acting bit holder

1993-05-26

1994-08-09

Bagnell, David J.

Mining or in situ disintegration of hard material

Miscellaneous

299 85, E21C 2510

Patent

active

053359771

ABSTRACT:
A double acting bit holder that permits bits held in it to be resharpened during cutting action to increase energy efficiency by reducing the amount of small chips produced. The holder consist of: a stationary base portion capable of being fixed to a cutter head of an excavation machine and having an integral extension therefrom with a bore hole therethrough to accommodate a pin shaft; a movable portion coextensive with the base having a pin shaft integrally extending therefrom that is insertable in the bore hole of the base member to permit the moveable portion to rotate about the axis of the pin shaft; a recess in the movable portion of the holder to accommodate a shank of a bit; and a biased spring disposed in adjoining openings in the base and moveable portions of the holder to permit the moveable portion to pivot around the pin shaft during cutting action of a bit fixed in a turret to allow front, mid and back positions of the bit during cutting to lessen creation of small chip amounts and resharpen the bit during excavation use.

REFERENCES:
patent: 3697137 (1972-10-01), Krekeler
patent: 3945681 (1976-03-01), White
patent: 5018793 (1991-05-01), Den Besten

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