Cutter head for personal care appliances
AssigneeBraun GmbH
InventorsUwe Fischer, Christian Schuebel, Martin Kluge, Martin Fuellgrabe
Life of this patent
Estimating the term…
Abstract
An electric shaver having a cutter head with a plurality of cutting rotors driven by a drive train connectable to a motor. The number of tooling rotors is significantly increased while at the same time the size of the tooling rotors is significantly reduced, thus being able to define an approximately smooth surface by the front faces of the tooling rotors.
Claims18
A tool head for a personal care appliance, including a plurality of tooling rotors rotatably supported about rotor axes and a drive train for rotatably driving said tooling rotors from a motor, wherein the tooling rotors are separately displaceably supported to elastically dive along their axes of rotation into a retracted position against a biasing force provided by biasing devices onto said tooling rotors, said biasing devices being configured to allow for a diving travel of at least about ¼ of a diameter of a tooling rotor,
- wherein said drive train includes:
- an input crank element having connection means for connecting to a drive shaft, said input crank element being rotatably supported about a first crank rotation axis, wherein a first crank connecting pin is attached to said input crank element at a position eccentric to said first crank rotation axis, said input crank element having a first crank lever arm (h) defined by a distance between said first crank connecting pin and said first crank rotation axis;
- a transmitter element configured to be driven by said input crank element;
- and
- a plurality of output crank elements configured to be driven by said transmitter element to rotate about said rotor axis, said output crank elements being rotatably supported about second crank rotation axes and second crank connecting pins being attached to each of said output crank elements at a position eccentric to a respective one of said second crank rotation axes, wherein said output crank elements each have a second crank lever arm (h) defined by a distance between said second crank connecting pins and said respective one of said second crank rotation axes,
- wherein said first and second crank rotation axes are parallel to each other and said first and second crank lever arms (h) have substantially a same lever length.
A personal care appliance comprising a tool head comprising a plurality of tooling rotors rotatably supported about rotor axes and a drive train for rotatably driving said tooling rotors from a motor, wherein the tooling rotors are separately displaceably supported to elastically dive along their axes of rotation into a retracted position against a biasing force provided by biasing devices onto said tooling rotors, said biasing devices being configured to allow for a diving travel of at least about ¼ of a diameter of a tooling rotor and a housing forming a handpiece and supporting said tool head,
- wherein said drive train includes:
- an input crank element having connection means for connecting to a drive shaft, said input crank element being rotatably supported about a first crank rotation axis, wherein a first crank connecting pin is attached to said input crank element at a position eccentric to said first crank rotation axis, said input crank element having a first crank lever arm (h) defined by a distance between said first crank connecting pin and said first crank rotation axis;
- a transmitter element configured to be driven by said input crank element;
- and
- a plurality of output crank elements configured to be driven by said transmitter element to rotate about said rotor axis, said output crank elements being rotatably supported about second crank rotation axes and second crank connecting pins being attached to each of said output crank elements at a position eccentric to a respective one of said second crank rotation axes, wherein said output crank elements each have a second crank lever arm (h) defined by a distance between said second crank connecting pins and said respective one of said second crank rotation axes,
- wherein said first and second crank rotation axes are parallel to each other and said first and second crank lever arms (h) have substantially a same lever length.
Dependencies are inferred from the claim text.