(19)
(11) EP 0 740 008 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
28.01.1998 Bulletin 1998/05

(43) Date of publication A2:
30.10.1996 Bulletin 1996/44

(21) Application number: 96105206.5

(22) Date of filing: 01.04.1996
(51) International Patent Classification (IPC)6: D06F 33/02, A47L 15/46
(84) Designated Contracting States:
DE ES FR GB IT SE

(30) Priority: 29.04.1995 DE 19515902

(71) Applicant: WHIRLPOOL EUROPE B.V.
5507 SK Veldhoven (NL)

(72) Inventors:
  • Eck, Gismar, c/o Whirlpool Europe s.r.l
    21024 Biandronno (VA) (IT)
  • Thumm-Jorge, Margret, c/o Whirlpool Europe s.r.l
    21024 Biandronno (VA) (IT)

(74) Representative: Guerci, Alessandro 
Whirlpool Europe S.r.l. Patent Department Località Cassinetta
21024 Biandronno (VA)
21024 Biandronno (VA) (IT)

   


(54) Safety switching apparatus against dry operation of electrical heating resistances, particularly for washing machines and dishwashers


(57) The invention relates to a safety switching apparatus against dry operation of electrical resistances, particularly for washing machines and dishwashers, with electromechanical or electronic control systems and level switches for monitoring the water level. Security against dry operation of the heating resistances is considerably improved in that two level switches monitor the normal water level and, incorporated in series, control a switch element, in that the switch element triggers the control motor and switches off the water intake valve, and in that the control motor, after expiry of a predetermined time, by means of control contacts, switches the heating resistance into parallel with the switch element in the heating and washing stage following the water intake stage.






Search report