Patent ID: 8887829
Filing Date: 2014-11-18
Classification: B25B,B25F,F16J

Abstract:
1. A hydraulic hand tool comprising: a frame; a hydraulic drive connected to the frame, wherein the hydraulic drive comprises a housing; a drive shaft extending from the hydraulic drive; and a seal assembly between the drive shaft and the housing, wherein the seal assembly comprises a first seal member in contact with the housing, a second seal member in contact with the drive shaft, and a carrier ring having an outer annular groove and an inner annular groove, wherein the first seal member is disposed within the outer annular groove, wherein the second seal member is disposed within the inner annular groove, wherein the carrier ring is comprised of a polymer material configured to elastically deform and maintain a substantially uniform sealing pressure against the drive shaft and the housing in response to a hydraulic load from hydraulic fluid at the hydraulic drive, and wherein the carrier ring has a coefficient of thermal expansion substantially similar to a coefficient of thermal expansion of the first seal member and/or the second seal member.