Driven seal assembly for rotary drive shaft of motor

A driven seal assembly for a shaft rotated by a motor disposed in a motor housing and having a seal housing adjacent the motor through which the shaft extends, the driven seal assembly comprising:

• 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 first rotor driver mounted on the shaft in mating relationship with the first rotary seal;
• 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;
• a second rotor driver mounted on the shaft in mating relationship with the second rotary seal;
• a set collar attached to the shaft for rotation therewith between the first and second rotor drivers and drivingly connected thereto;
• and
• a spring of substantially constant diameter surrounding the set collar in spaced relationship therefrom and placed in compression between the first and second rotor drivers,
• whereby the set collar is drivingly connected to the first and second rotor drivers independently of the spring,
• whereby the spring exerts bi-directional forces causing the first and second rotary seals to engage the first and second stationary seal seats, and
• wherein the set collar, the first and second rotor drivers and the first and second rotary seals define a positive drive mechanism for urging the first and second rotary seals against the first and second stationary seal seats upon rotation of the shaft.

A driven seal assembly for a shaft rotated by a motor, the driven seal assembly comprising:

• a first rotary seal frictionally fit on the shaft;
• a first rotor driver mounted on the shaft in mating relationship with the first rotary seal, the first rotor driver being freely movable along the length of the shaft;
• a second rotary seal frictionally fit on the shaft;
• a second rotor driver mounted on the shaft in a mating relationship with the second rotary seal, the second rotor driver being freely movable along the length of the shaft;
• a set collar attached to the shaft for rotation therewith, the set collar being positioned between the first and second rotor driver and drivingly connected thereto;
• and
• a spring of substantially constant diameter surrounding the set collar in spaced relationship therefrom and placed in compression between the first and second rotor drivers, whereby the spring exerts a bi-directional force on the first rotor driver and the second rotor driver into engagement with the first and second rotary seal, and
• whereby the set collar is drivingly connected to the first and second rotor drivers independently of the spring.