The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 03, 1985
Filed:
Oct. 29, 1984
Donald E Lewis, Letts, IA (US);
Delmar D Lewis, Muscatine, IA (US);
Other;
Abstract
A typical fluid mixer of the heavy-duty type conventionally has a compartment including walls, one of which has a circular opening through which a motor-driven shaft extends. An external seal is provided for sealing the shaft-to-wall junction against fluid leakage. When it becomes necessary to replace the seal, the compartment must be drained to avoid leakage at the opening. The present invention provides an internal seal that is normally spaced along the shaft away from the wall but which can be forcibly moved toward and compressed against the wall and thus seal the shaft and opening and preventing leakage during repairs and consequently eliminating emptying the tank. The interior seal is supported by a movable carrier, and reversible force-exerting mechanism extending exteriorly of the compartment is employed to move the carrier and interior seal into and out of its interior sealing position. In a preferred embodiment, the force-exerting mechanism includes one or more jack screws.