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:
Nov. 01, 1988
Filed:
Apr. 11, 1986
Tore H Noren, Petaluma, CA (US);
The Stero Company, Petaluma, CA (US);
Abstract
A commercial warewasher consecutively washes racks of soiled ware, such as dishes, through a machine cycle which includes recirculating wash water over the ware followed by a fresh water spray rinse. Part of the wash water is drained and a second portion is retained in the machine after each rack of dishes is washed, then combined with subsequent fresh rinse water spray to provide a volume of water sufficient for pumped wash recirculation for the next rack without cavitation. When a drain valve is opened, water pressure to the wash arm system is reduced, flow through it decreases, and when the pump stops the wash system will drain by gravity to the lowest point in the wash system plumbing. In the meantime the pump discharges wash water until the level of water in the sump and/or its associated outlet pipe reaches the level of the pump impeller eye. The pump begins to cavitate and effectively ceases to pump water. The pump and its drive motor are mounted outside the perimeter of the cabinet, with the pump impeller inverted and the drive motor extending vertically above the pump, leaving substantial open space between the supporting floor and the underside of the machine for ease of cleaning and maintenance in a crowded kitchen environment.