U.S. Philips Corporation

Koninklijke Philips Corporation N.v.

Michiel A Schallig

Peter Sofrides Viet

Jan Hans Benedictus

Hendrik Richard Jousma

Albert J Meijer

Johannes At Driessen

Jan Tiesinga

Wilhelmus H Bruggink

Marcus G De Wit

Raimond Visser

Willem Sjoerd Dijkstra

One embodiment of an actuator system for a power dental cleaning appliance to produce a tapping motion of bristle tufts in a dental cleaning appliance includes a plurality of piston elements () mounted in a brushhead for movement away from and then toward the brushhead (). Bristle tufts () are positioned on the piston elements and move sequentially against and away from the teeth to produce a cleaning action. A low frequency fluid pressure action () in the range of 1-6 Hz maintains conformity of the bristle tufts in a low frequency sequence against the teeth, while a higher frequency fluid pressure action () in the range of 100-300 Hz moves the bristle tufts at that frequency to produce a tapping bristle action on the teeth to produce cleaning. In another embodiment, an actuation system includes an elongated actuator member () made of elastic material which expands and contracts about its longitudinal axis at a selected frequency by fluid pressure. A plurality of actuator sections () are fixedly mounted on the actuator element. The actuator sections are configured such that as the actuator member expands, an upper bridge portion () of the actuator section moves upwardly. The bristle tufts () mounted thereon produce a cleaning action on the teeth.

Power dental cleaning appliance with actuator system for producing a short bristle stroke

The invention relates to an electrical surface treatment device which is provided with an acoustic surface type detector with which a type of a surface to be treated can be detected during operation. According to the invention, the surface type detector delivers an output signal (u.sub.FT) during operation which is characteristic of the type of surface to be treated and which is determined by a value of a physical quantity of air vibrations reflected by the surface to be treated, which value is measured by a vibration detector of the surface type detector. In a special embodiment, the physical quantity is an amplitude, and the surface type detector is a vibration generator for generating air vibrations having a predetermined amplitude. The generated air vibrations preferably have a frequency of at least 15,000 Hz which varies within a predetermined range. In a further embodiment, the vibration generator generates the air vibrations intermittently, and the surface type detector is a parallel circuit through which a portion of the generated air vibrations can be directly guided to the vibration detector.

Electrical surface treatment device with an acoustic surface type

A deep-frying device comprising a reservoir, a discharge channel for discharging fumes, and a converter for converting volatile organic compounds into carbon dioxide and water, has a passage for the admixture of ambient air to the fumes exuded during deep-frying. This provides an improved odour reduction. In the case of upstream admixture additional oxygen is available, as a result of which a more complete conversion is achieved. In the case of downstream admixture, conversion is possible at a higher temperature without a corresponding rise in the temperature of the discharged mixture.

Deep-frying device

A vacuum cleaner comprises a suction unit (23) which is drivable by means of a first electric motor (25). A suction attachment (7) of the vacuum cleaner comprises a rotatable brush (41) which is drivable by means of a second electric motor (45). The vacuum cleaner comprises a control unit (29) by means of which an electric current through the first motor (25) can be controlled. In accordance with the invention, the control unit (29) controls the current through the first motor (25) as a function of a mode of operation of the brush (41), which mode can be selected by a user of the vacuum cleaner. In this way, the suction power of the suction unit (23) is adapted to the mode of operation of the brush (41), thereby improving a relationship between cleaning performance, ease of use, current consumption and noise production of the vacuum cleaner. In a special embodiment of a vacuum cleaner in accordance with the invention the control unit (29) controls an air pressure and an air flow in the suction attachment (7) in such a manner that the air pressure does not decrease below a first limit value (H.sub.MIN), the air flow does not exceed a second limit value (Q.sub.MAX), and at least one of the limit values (H.sub.MIN, Q.sub.MAX) is substantially reached.

Vacuum cleaner with power control in dependence on a mode of operation

An apparatus includes a baffle (41) and a loudspeaker (1). The stiffness of the loudspeaker chassis is dimensioned so as to reduce transmission of vibrations from the loudspeaker to the baffle.

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Drachten, Netherlands

Michiel A Schallig