DETERGENT AND WETTING AGENT DISPENSER FOR DISHWASHING MACHINES

• US 3,680,784 A
• Filed: 01/27/1971
• Issued: 08/01/1972
• Est. Priority Date: 01/27/1971
• Status: Expired due to Term

• Current Assignee: Roger E. Fakes
• Original Assignee: Roger E. Fakes
• Inventors: Fakes, Roger E.
• Primary Examiner(s): Wood, Jr., M. Henson
• Assistant Examiner(s): Culp, Jr., Thomas C.
• Application Number:
  US05/110,052
• Time in Patent Office: 552 Days
• Field of Search: 239/126,127 222/132,135,255 137/566 134/57D,58D
• US Class Current: 239/126
• CPC Class Codes: A47L 15/4418 in the form of liquids A47L15/4409, A47L15/4436, A47L15/4445 take precedence

Abstract

In a dishwashing machine wherein wash water containing detergent and a wetting agent is re-circulated from a sump over dishes at a washing station, rinse water containing a wetting agent is sprayed over dishes at a rinse station, and at least some of the rinse water is drained for make-up to the wash water sump, a feed system is provided for delivering a predetermined, regulatable ratio of detergent and wetting agent to the sump at start-up, and another predetermined regulatable amount of detergent to the sump during each rinse cycle so as to maintain in the wash water a constant ratio of detergent to wetting agent and constant concentration thereof in the wash water.

Claims

1. In a dishwashing machine having a wash water sump, a wash water spray head, a pump for re-circulating wash water to the wash water spray head, a fill water supply line for the sump, a rinse water spray head, a rinse water supply line for the rinse water spray head, and fill water and rinse water control valves for said supply lines, and separate reservoirs for wetting agent and detergent, the improvement which comprises a first variable delivery pump having an intake line leading from the wetting agent reservoir and an output line leading into the rinse water supply line, a second variable delivery pump having an intake line leading from the wetting agent reservoir and an output line leading to the sump, third and fourth variable delivery pumps each having an intake line leading from the detergent reservoir and an output line leading to the sump, each of said variable delivery pumps being driven by an electric motor normally open electrical circuits for energizing said motors, a first switch for closing the circuits to the motors for said second and fourth variable delivery pumps in response to opening of said fill water control valve, and a second switch for closing the circuits to the motors for said first and third variable delivery pumps in response to opening of said rinse water control valve.

2. The combination claimed in claim 1, said first switch being pressure responsive and having sensors disposed in said fill water line downstream of the fill water control valve.

3. The combination claimed in claim 1, said second switch being pressure responsive and having sensors disposed downstream of the rinse water control valve.

4. The combination claimed in claim 1, said switches being pressure responsive and having sensors disposed in said lines downstream of said control valves.