1980-05-27
1981-10-13
Footland, Lenard A.
Cutlery
3081871, F16C 3374
Patent
active
042944929
ABSTRACT:
A caliper seal assembly is adapted to seal two relatively moving parts in a drilling tool or drill bit or other device where a sealing relationship must be maintained under relatively large relative position and tolerance changes between the two movable parts, under relatively rapid pressure variations and surges, and under relatively high temperature conditions. The caliper seal includes a pair of flexible flank members having contact pads formed thereon and between which sealing surfaces of a flange-like projection extend. The caliper seal is particularly advantageous for sealing bearing assemblies between a cutter wheel and the body of a rotary drill bit. A heat pipe assembly can be incorporated within the flange-like projection to remove excess heat generated by the frictional contact of the contact pads on the flange sealing surfaces. The flange projection can also be formed with an interior fluid conducting conduit to remove excess heat. The seal assembly may be operatively connected to be moved in conjunction with an intermediate moving element carried between or positively indexed with respect to two relatively moving raceways of a bearing assembly. In combination with a compensator assembly, the caliper seal provides an improved lubricating system in a drill bit or drilling tool.
REFERENCES:
patent: 2192305 (1940-03-01), Gilman
patent: 2373860 (1945-04-01), Torresen
patent: 2705164 (1955-03-01), Dasse
patent: 3442516 (1969-05-01), Voitek
patent: 4240674 (1980-12-01), Evans
Footland Lenard A.
Ley John R.
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