MICHAEL A ANDERSON
Nursing at 2 Ln, Auburn, WA
License number
Florida 2104872
Issued Date
Apr 16, 1990
Effective Date
Jan 1, 1901
Expiration Date
Jul 31, 1996
Category
Health Care
Type
Registered Nurse
Address
Address
31900 2Nd Ln SW APT G-207, Auburn, WA 98023
Professional information
Small Disc Cutter, And Drill Bits, Cutterheads, And Tunnel Boring Machines Employing Such Rolling Disc Cutters
US Patent:
6131676, Oct 17, 2000
Filed:
Oct 5, 1998
Appl. No.:
9/167041
Inventors:
James E. Friant - Seattle WA
Michael A. Anderson - Auburn WA
Michael A. Anderson - Auburn WA
Assignee:
Excavation Engineering Associates, Inc. - Seattle WA
International Classification:
E21B 1022
US Classification:
175371
Abstract:
Small diameter rotary drill bits using rolling disc cutters. Novel small diameter rotary drill bits with detachable pedestal mounted rolling disc cutters are provided. The bit body has a plurality of longitudinal edge mounting slots located at preselected angularly spaced apart locations. Preferably, the slots each have an upper protective ledge and downwardly extending sidewalls. A set of peripheral pedestal mounts each having a mounting portion sized and shaped to fit into a preselected mounting slot are provided and each is detachably mounted in its preselected mounting slot. In one embodiment, the longitudinally extending slots further comprise a wedge shaped edge portion, and the pedestal mounts have a complimentary angularly shaped portion, so that when the pedestal mount is brought into a close fitting relationship with the longitudinal slot, the pedestal mount and the longitudinal slot are tightly and securely interfitting. The pedestal mounts each include, at the lower reaches thereof, at least one small diameter single cutting edge rolling disc cutter. The rolling disc cutters are affixed at individually preselected radially spaced apart locations with respect to a central longitudinal axis forming the center of rotation of the rotary drill bit.