Annular shim for construction bit having multiple perforations f

Boring or penetrating the earth – Bit or bit element – Plural separable cutter elements

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Details

299 91, 228122, 22826312, E21B 1052

Patent

active

048218197

ABSTRACT:
Formation of a continuous double sandwich braze joint between a bit body of a conical bit and a carbide insert tip disposed in a cylindrical recess formed in a forward end of the bit body is facilitated by a cylindrical shim. In one form, the shim is a cylindrical sleeve having an annular sidewall with opposite forward and rearward open ends. The insert tip is received through the forward open end of the sleeve. Also, a multiplicity of perforations are defined in spaced apart relation through the sidewall and uniformly distributed thereabout. The multi-perforated sleeve is disposed within the bit body recess and between its interior and the exterior of a cylindrical base of the insert tip such that the multiplicity of perforations defined in the sleeve sidewall provide a multiplicity of spaces extending between the bit body and insert tip for receiving braze therethrough. In an alternative form, the shim is a cylindrical basket having a sidewall and endwall. The sidewall is open at its forward end and closed at its rearward end by the endwall. The basket also has a multiplicity of perforations defined through and distributed uniformly about its sidewall and endwall. The endwall is frusto-conical shaped and protrudes away from the sidewall rearward end.

REFERENCES:
patent: 1956233 (1934-04-01), Braun
patent: 3294186 (1966-12-01), Buell
patent: 4251018 (1981-02-01), Funk
patent: 4330044 (1982-05-01), Orr et al.
patent: 4356873 (1982-11-01), Dziak
patent: 4668118 (1987-05-01), Bucher et al.

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