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US 10,864,644 B2Granted
Electric appliance for personal care
AssigneeBraun GmbH
InventorsBernhard Kraus, Thomas Verstege, Uwe Schober, Frank Ziegler
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AssigneeBraun GmbH
InventorsBernhard Kraus, Thomas Verstege, Uwe Schober, Frank Ziegler
Estimating the term…
The present invention relates to electric appliances for personal care, in particular electric shavers, comprising a magnetic linear drive unit having first and second drive components supported for linear displacement relative to each other by a spring device and adapted to magnetically interact with each other. The spring device includes at least one leaf spring having a constricted section in a central region of the leaf spring, wherein surfaces of the at least one leaf spring neighboring the constricted section are shaped convex. Such convex surfaces may have a parabolic contour.
An electric appliance for personal care comprising a magnetic linear drive unit having first and second drive components connected to each other by a spring device for linear oscillation relative to each other and adapted to magnetically interact with each other, wherein said spring device includes a leaf spring comprising a pair of opposing main surfaces and a constricted section in a central region of the leaf spring, wherein each of the opposing main surfaces of said leaf spring has a convex shape such that the convex shape starts at the constricted section and extends outwardly, and wherein said convex shape of each of said convex main surfaces is a parabolic shape.
A magnetic linear drive unit for driving a reciprocating tool of an electric appliance, said magnetic linear drive unit comprising first and second drive components connected to each other by a spring device for linear oscillation relative to each other and adapted to magnetically interact with each other, wherein said spring device includes at least one leaf spring having a constricted section in a central region of the leaf spring, wherein surfaces of said at least one leaf spring neighboring said constricted section are shaped convex, wherein said convex shape of each of said surfaces is a parabolic shape.
Dependencies are inferred from the claim text.