Abstract:
The present description is concerned with a personal hygiene device having a drive unit, an energy storage, in particular a rechargeable battery, a determination unit for repeatedly or constantly determining an energy storage level of the energy storage, and a control unit arranged for providing energy from the energy storage at the drive unit during an on state of the personal hygiene device and for gradually reducing the energy level provided at the drive unit from a nominal energy level to a first reduced energy level during a first energy level reduction time period when the determined energy storage level has fallen below a first energy storage level threshold but is above a second energy storage level threshold and for continuing provision of the first reduced energy level while the personal hygiene device stays in an on state and the determined energy storage level stays above the second energy storage level threshold.
Abstract:
The present disclosure proposes a resonant motor unit that has a resonant motor, a control unit for driving the resonant motor at a driving frequency, for short-circuiting the resonant motor during at least a first short-circuiting phase in successive driving cycles and for concluding the first short-circuiting phases by switching off the current flow through the resonant motor at least at a predetermined first time instant within the driving cycles, a measurement unit for successively measuring at least a first voltage signal provided by the resonant motor at the predetermined first time instant, and an evaluation unit for determining whether the first voltage signal has changed between successive measurements.
Abstract:
A plurality of mass-produced multi-component housings (100) having a length and comprising at least a first component (41) comprising a first plastic material (41a), a second component (42) comprising a second plastic material (42a), and a third component comprising a third plastic material (43a). Each of the housings includes at least one tolerance-elimination element (50) made of the second plastic material and longitudinally attached to the first component along the housing's longitudinal axis. The tolerance-elimination element has an average length extending parallel to the housing's longitudinal axis, which average length is at least ten times less than the length of the housing. The third component at least partially forms an outer surface of the housing, so that the tolerance-elimination element is at least partially overmolded by the third plastic material. The tolerance- elimination elements of the plurality of multi-component housings are structured to cause lengthwise maximal dimension variations of the length L among the individual multi-component housings to be not greater than 0.1 mm.
Abstract:
A process for making a multi-component hollow housing (100) comprises injecting a first plastic material into a first mold cavity and causing it to solidify to form a first component (41), whereby the first plastic material shrinks lengthwise; injecting a second plastic material into a second mold cavity having the first component transferred thereto and causing the second plastic component to solidify to form a second component (42), the second component comprising a tolerance-elimination element (50) that is longitudinally attached to the first component (41) at one of the ends thereof, wherein a length of the shrunk first component is at least ten times greater than a length of the tolerance-elimination element, and wherein an absolute lengthwise shrinkage of the second plastic material forming the tolerance-elimination element is at least ten times smaller than the lengthwise shrinkage of the first plastic material; at least partially overmolding an intermediate part comprising the first and second component with a third plastic material in a third mold cavity, thereby forming the multi-component housing in which the tolerance-elimination element is at least partially overmolded by the third plastic material (43a), and wherein the third plastic material forms at least a portion of an outer surface of the multi-component housing (100); and removing the multi-component (100) housing from the core.
Abstract:
A multi-component housing (100) having a length and comprising at least a first component (41) comprising a first plastic material (41a), a second component (42) comprising a second plastic material (42a), and a third component comprising a third plastic material (43a). The housing includes at least one tolerance-elimination element (50) made of the second plastic material and longitudinally attached to the first component along the housing's longitudinal axis. The tolerance-elimination element (50) has an average length (H) extending parallel to the housing's longitudinal axis, which average length is at least ten times less than the length of the housing. The third component at least partially forms an outer surface of the housing, so that the tolerance-elimination element is at least partially overmolded by the third plastic material.