Patent ID: 7347290
Filing Date: 2008-03-25
Classification: E21B,F16J

Abstract:
1. A seal assembly for a drill bit comprising: a bit body including a sealing surface; a substantially rigid seal ring having a dynamic sealing surface; a first resilient ring having radially inner and radially outer surfaces and comprising a first material; a second resilient ring having radially inner and radially outer surfaces and comprising a second material having a different hardness than said first material; wherein said radially outer surface of said first resilient ring engages said radially inner surface of said second resilient ring forming a static seal therebetween; wherein said radially outer surface of said second resilient ring engages said seal ring and forms a static seal between said seal ring and said second resilient ring; and wherein said radially inner surface of said first resilient ring engages said sealing surface of said bit body and forms a static seal between said bit surface and said first resilient ring.