Rotary retainer for mining bits

Details Rotary retainer for mining bits Rotary retainer for mining bits

1985-05-31

1986-08-26

Novosad, Stephen J.

Mining or in situ disintegration of hard material

Miscellaneous

299 91, 299 93, E21B 1000

Patent

active

046078916

ABSTRACT:
A cutter bit holding assembly is disclosed. The cutter bit assembly contains a cutter bit having a shank portion and a cutter bit holder having a socket for receiving the cutter bit shank portion. Also included is a rotary locking element which is associated with the cutter bit holder and a bore adjacent the socket. The bore runs in a direction parallel the direction in which the bit holder cuts. The locking element has an offset locking portion which cooperates with an indented locking surface on the bit shank. The rotary locking element is capable of being rotated completely out of the socket bore and out of engagement with the bit shank locking surface to permit the unencumbered removal or insertion of a bit. An elastomeric element inserted along part of the bore in the cutter bit holder is utilized to prevent rotation of the locking element out of engagement with the bit shank locking surface during operation of the cutting device.

REFERENCES:
patent: 1613693 (1927-01-01), Davis
patent: 2720392 (1955-10-01), Cartlidge
patent: 4094611 (1978-06-01), Harper et al.

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