U.S. Philips Corporation

Willem L Van Der Sluijs

Johannes Johanna Van Herk

Jacobus H Neijzen

Petrus W De Roo

A food processor is provided having a motor (18), a bowl (10) and a beater (12) which are movable relative to each other by a drive by the motor (18), a switching means (48) for switching the motor (18) on and off under the control of a start signal (START) and at least a first stop signal (STOP1) respectively, torsion measuring means (28/30, 32/34) for producing a torsion signal (TS) which is a measure for the torque necessary for the drive, a signal processing unit (42) for producing at least the first stop signal (STOP1) in response to the torsion signal (TS). The signal processing unit (42) includes a first differentiator (56) and/or a second differentiator (58) for producing the first (DTS) and the second derivative (DDTS) of the torsion signal (TS) and a comparator (62) in which the first (DTS) or second (DDTS) derivative is compared with a reference value (REF1). When the reference value is exceeded, the comparator produces a stop signal (STOP1) to switch off the motor (18). The food processor stops by itself once a predetermined bending point in the torsion signal (TS) occurs, so that it becomes possible to whip cream of varying quantity, quality and composition without supervision.

Food processor with automatic stop and signal processing unit with

A refrigerator is provided with a continuous length of capillary material that extends via an opening in the refrigerator wall into contact with an evaporator in an enclosed evaporator space and with an externally disposed condensor. A hygroscopic liquid is contained in the continuous length of capillary material for absorption of moisture in the evaporator space and for elimination of moisture outside the refrigerator wall. The two ends of the continuous length of capillary material are arranged in liquid-transmitting contact with each other so that the hygroscopic liquid flows in a closed circuit.

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Eindhoven, Netherlands

Willem L Van Der Sluijs