Patent ID: 7726658

Claim:
In a driven seal assembly for a shaft rotated by a motor disposed in a motor housing and having a seal housing adjacent to the motor housing through which the shaft extends, there being a first stationary seal seat mounted on the shaft and secured in a bore of the seal housing, a first rotary seal frictionally fit on the shaft adjacent the first stationary seal seat, a second stationary seal seat mounted on the shaft and secured in a bore of the motor housing, a second rotary seal frictionally fit on the shaft adjacent the second stationary seal seat, the improvement wherein: a positive drive mechanism is mounted on the shaft between the first and second rotary seals in a driving, mating relationship therewith and includes a first driving element in driving engagement with the first rotary seal and a second driving element in driving engagement with the second rotary seal; and a spring is placed in compression between the first and second driving elements to provide a bi-directional axial force on the first and second driving elements to press the first and second rotary seals against the first and second stationary seal seats, whereby the first and second driving elements are drivingly connected together independently of the spring for rotation with the shaft by a driving arrangement engaged by the first and second rotary seals.