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Device for washing machines to control the introduction of detergent

  • US 5,205,445 A
  • Filed: 12/12/1991
  • Issued: 04/27/1993
  • Est. Priority Date: 12/14/1990
  • Status: Expired due to Fees
First Claim
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1. A device for the control of the introduction of detergent into a tub of a washing machine, in particular a laundry-washing machine or a combined machine for the washing and drying of laundry, comprising at least one microprocessor controlling the action of selected operating cycles as well as a dispenser having a number of separate compartments to contain detergents or additives, the dispenser communicating with the tub and being provided with at least one rotary selector connected to a water supply of the machine and settable to each compartment of said dispense, said rotary selector being suitable to be set to different regulatory positions by means of a system of jointed levers associated with at least two box-like housings containing wax heatable by at least a relevant PTC sensor, wherein said PTC sensors (20, 21) are supplied with power by an electric circuit of the machine through a semiconductor switch such as a triac (32) or similar bidirectional conductor, and through at least a respective first and second unidirectional conductors, such as diodes (34, 35), which are biased in a mutually opposite direction.

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