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:
Oct. 18, 1988
Filed:
Nov. 25, 1987
Heishin Sobi Kabushiki Kaisha, Kobe, JP;
Abstract
This disclosure relates to a metering dispenser which dispenses fluid in accurate proportion to the pump revolution speed, and to an improved shaft seal for the motor drive shaft of a metering dispenser. An elastic sleeve membrane is mounted inside an expanded area provided in a part of the peripheral wall of the pump casing so that a constant-pressure chamber is formed to the outside of this sleeve membrane, and the pressure inside the pump casing is maintained within a set pressure range by introducing a pressurized fluid into this constant-pressure chamber and releasing the pressurizing fluid from the constan-pressure chamber as needed. The improved shaft seal includes a circular channel formed at the center of the shaft seal, this circular channel and the aforementioned constant-pressure chamber being linked, and the internal pressure of the pump casing acting upon the pressure inside this circular channel via the elastic sleeve membrane of the constant-pressure chamber so that the pressure inside the circular channel and the internal pressure of the pump casing are always equal.