Detachable shoe plates for large diameter drill bits

Details Detachable shoe plates for large diameter drill bits Detachable shoe plates for large diameter drill bits

1982-09-24

1984-08-21

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Plural separable cutter elements

175413, 407 46, 408713, E21B 1020

Patent

active

044664982

ABSTRACT:
Shoe members and drill shank members for large diameter cable drilling bits are provided with a tongue on one of the members that projects axially relative to the drill shank member and with an arcuate lip and projecting stop on the other of the members to trap the tongue and prevent radial movement of the shoe member in response to radially directed forces caused by the spinning of the bit in drilling operations. Such forces would impose shear stresses on the fastening members that extend through the shoe member and axially into the drill shank. Four embodiments are disclosed: a spudding bit, two star bits and a scow bit.

REFERENCES:
patent: 1586415 (1926-05-01), Duda
patent: 1995043 (1935-03-01), Sanderson
patent: 2022055 (1935-11-01), Sanderson
patent: 2326908 (1943-08-01), Williams, Jr.
patent: 2506341 (1950-05-01), Bullock
patent: 3382940 (1968-05-01), Stebley
patent: 3536150 (1970-10-01), Stebley
patent: 3545554 (1970-12-01), Bardwell
patent: 4083415 (1978-04-01), Kita et al.

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