Seal protector for a sealed bearing rock bit

Details Seal protector for a sealed bearing rock bit Seal protector for a sealed bearing rock bit

1978-02-27

1980-03-25

Butler, Douglas C.

Cutlery

277 92, 308 361, F16C 3376

Patent

active

041947959

ABSTRACT:
A rock bit having a seal protector positioned within each seal gland for eliminating shale packing behind the seal and restricting the axial movement of the seal. The rock bit includes a bit body having a plurality of legs depending therefrom, each leg having a cutter rotatively mounted thereon. A seal is positioned between each cutter and leg to prevent lubricant from leaking to the exterior of the bit and prevent drilling fluid, shale or the like from entering into the bearing area. Each seal protector comprises an annular ring located within each gland on the side of the seal facing the exterior of the bit. The annular ring extends the full length of the gland between the cutter and leg for preventing the shale and other debris from passing therethrough to attack the seal. The annular ring also fully extends across the clearance between the seal and the gland width to restrict the seal from axial movement due to internal and external pressure differentials and prevent the seal from bunching or wrapping up. The annular ring further includes an inner contoured face made of a low coefficient of friction material which mates with the exterior side of the seal in order to reduce the friction between the cutter and the leg and extend the life of the seal.

REFERENCES:
patent: 2797067 (1957-06-01), Fisher
patent: 3195421 (1965-07-01), Rumsey et al.
patent: 3761145 (1973-09-01), Schumacher, Jr.

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