Collared boring bit

Details Collared boring bit Collared boring bit

1998-12-15

2000-10-03

Bagnell, David

Boring or penetrating the earth

Means traveling with tool to constrain tool to bore along...

175398, 175400, 175435, E21B 704, E21B 708

Patent

active

061259500

ABSTRACT:
A collared boring bit which interfaces with a boring head whereby shear forces developed during a boring operation are transmitted through the collar to the boring head, with minimal shear force being carried by the bolts. A bit collar is welded to a boring bit, wherein a head receptacle formed collectively of the bit collar and the boring bit seatably receives a boring head with substantially close clearance so that shear forces during boring operations are transmitted from the boring bit to the boring head through the bit collar. The preferred bit collar is fabricated from a pipe section, such as for example steel seamless pipe. A bit recess is cut for interfacing with a boring bit at the head face connection thereof. A head recess is cut opposite the bit recess for providing an exit for the water spray from the nozzle thereof. Both the bit recess and the head recess converge toward and communicate with a forward end of the pipe section, whereat a brace is welded transversely to interconnect the remaining left and right pipe components to thereby form the bit collar. It is preferred for carbide weld beads to be crisscrossingly placed upon the outer surface of the bit collar, as well as along the periphery of the head recess, to thereby add resistance to wear.

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Ditch Witch.RTM. Jet Trac.RTM. Directional Boring System Catalog of the Charles Machine Works, Inc. Perry, OK 73077; undated.
Directional Depot Spring '98 Catalog of Directional Depot, La Mirada, CA 90637; Dated: Spring of 1998.
Directional Boring Accessories Catalog of Vermeer Manufacturing Co., Pella, Iowa 50219; Dated: 1997.

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