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US 4,538,821 AGranted
Mechanical seals
AssigneeFlexibox Limited
InventorNeil M. Wallace
Life of this patent
Estimating the term…
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AssigneeFlexibox Limited
InventorNeil M. Wallace
Estimating the term…
A mechanical seal for a shaft (1) existing a housing (12) has an end plate (22) secured to the housing and a sleeve (26) secured to the shaft. The sleeve (26) carries a rotary seal element (40) and the end plate a stationary seal element (52) which form a running seal at faces (48,50). A multipurpose bush (60) is a close fit on the sleeve (26), it positions a spring (64) pressing the seal elements (40,52) together, it caries a lipseal (78) and it prevents collar (30) securing the sleeve (26) to the shaft (10) from contacting the end plate (22) in the event that the sleeve becomes unsecured from the shaft (110). The bush (60) is constructed from spark resistant material. A removable key (88) positions the sleeve (26), and hence the seal elements (40,52) and bush (60) with respect to the end plate (22) prior to tightening sleeve-security screws (32).
A mechanical seal adapted to seal a rotary shaft (10) exiting a housing (12) containing a fluid product (14) to be retained inside the housing, the seal comprising
A mechanical seal as claimed in claim 4 in which a pin (70) extends through the end plate (72) and engages a slot (72) in the bush whereby the bush (60) is prevented from rotating with respect to the end plate (22).
A mechanical seal adapted to seal a rotary shaft (10) exiting a housing (12) containing a fluid product (14) to be retained inside the housing, the seal comprising
A mechanical seal adapted to seal a rotary shaft (10) exiting a housing (12) containing a fluid product (14) to be retained inside the housing, the seal comprising
Dependencies are inferred from the claim text.