Boring or penetrating the earth – Bit or bit element – Plural separable cutter elements
Patent
1996-12-03
1998-09-22
Neuder, William P.
Boring or penetrating the earth
Bit or bit element
Plural separable cutter elements
175428, 175434, 761082, E21C 1300
Patent
active
058101039
ABSTRACT:
A method and apparatus for improved attachment of a PCD compact, especially a two-layer disk-type PCD compact, to a tool or support surface with a mechanical connection. In general the PCD compact is provided with a blind bore in the substrate layer, the bore terminating in the substrate layer and opening onto an outer face of the substrate layer intended to engage or abut the tool or support surface. A mechanical fastener is inserted into the blind bore such that it is secured to the PCD compact to form an integral unit with a tool-engaging end of the fastener protruding from the compact. In a preferred form the mechanical fastener is a metal post having at least one, and alternately both, ends threaded for threaded engagement to both the blind bore (which would have its own threads) and suitable threaded openings on the tool.
REFERENCES:
patent: 2631360 (1953-03-01), Sanford et al.
patent: 2917819 (1959-12-01), Britton et al.
patent: 3271080 (1966-09-01), Gowanlock
patent: 3749190 (1973-07-01), Shipman
patent: 4047583 (1977-09-01), Dyer
patent: 4466498 (1984-08-01), Bardwell
patent: 4654947 (1987-04-01), Davis
patent: 5007685 (1991-04-01), Beach et al.
Neuder William P.
Sylvan Engineering Company
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