E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
277/39
E21B 10/22 (2006.01) F16J 15/28 (2006.01) F16J 15/34 (2006.01)
Patent
CA 1332180
SEAL AND SEAL SHIELD ASSEMBLY FOR ROTARY DRILL BITS ABSTRACT OF THE INVENTION A seal and seal shield assembly for rotary drill bits having a journal member comprising a first bearing member, and a rolling cutter with a bore having an open end rotatably mounted thereon comprising a second bearing member. The roll- ing cutter has a counterbore at the open end defining an ann- ular cavity. The seal and seal shield assembly is compress- ion-loaded in the cavity to retain lubricant in the bit. The seal assembly has a pair of annular rings each with a radial- ly extending wall and an axially extending wall defining an annular seal gland. An elastic spring member compression- loaded in the seal biases the exterior surfaces against the bearing surfaces. A flat malleable annular disc with lubri- cating properties is positioned at the outer face of the seal assembly and a rigid annular disc is positioned in supporting relation thereto. A second flat malleable annular disc is positioned at the outer face of the rigid disc adjacent to the journal member seal thrust face. The malleable annular disc members deform under pressure and extrude to seal voids at the bearing surfaces and to prevent the entrance of abrasive particulate matter.
567594
Finlayson & Singlehurst
Tatum David M.
LandOfFree
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