Electronic toothbrush
First Claim
Patent Images
1. An electric toothbrush comprising a brush casing, a toothbrush shaft adapted to rotate in said brush casing, and a bristle carrier disc which is connected to one end of said toothbrush shaft by a gear arrangement that converts one-way rotary motion of the toothbrush shaft into a reciprocating rotary motion of the bristle carrier disc;
- said bristle carrier disc comprising a pair of bearing surfaces and at least one gap therebetween;
said gear arrangement comprising an eccentric mounted at said one end of said toothbrush shaft, said eccentric engaging in said gap in the bristle carrier disc, and wherein the eccentric is formed by at least one cam disc which bridges the gap in every angular position, wherein the two bearing surfaces extend parallel with each other and bear against the eccentric and the eccentric is formed as a non-circular, approximately elliptical cam disc.
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Accused Products
Abstract
An electric toothbrush having a cam disc mounted at the free end of a toothbrush shaft and which engages between two follower pins of a bristle carrier disc. The form of the cam disc is approximately elliptical. This causes it to impart a reciprocating motion to the bristle carrier disc when the toothbrush shaft is driven in rotation.
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Citations
16 Claims
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1. An electric toothbrush comprising a brush casing, a toothbrush shaft adapted to rotate in said brush casing, and a bristle carrier disc which is connected to one end of said toothbrush shaft by a gear arrangement that converts one-way rotary motion of the toothbrush shaft into a reciprocating rotary motion of the bristle carrier disc;
- said bristle carrier disc comprising a pair of bearing surfaces and at least one gap therebetween;
said gear arrangement comprising an eccentric mounted at said one end of said toothbrush shaft, said eccentric engaging in said gap in the bristle carrier disc, and wherein the eccentric is formed by at least one cam disc which bridges the gap in every angular position, wherein the two bearing surfaces extend parallel with each other and bear against the eccentric and the eccentric is formed as a non-circular, approximately elliptical cam disc. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- said bristle carrier disc comprising a pair of bearing surfaces and at least one gap therebetween;
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8. An electric toothbrush comprising a brush casing, a toothbrush shaft adapted to rotate in said brush casing, and a bristle carrier disc which is connected to one end of said toothbrush shaft by a gear arrangement that converts one-way rotary motion of the toothbrush shaft into a reciprocating rotary motion of the bristle carrier disc;
- said bristle carrier disc comprising a pair of bearing surfaces and at least one an therebetween;
said gear arrangement comprising an eccentric mounted at said one end of said toothbrush shaft, said eccentric engaging in said gap in the bristle carrier disc, and wherein the eccentric is formed by at least one cam disc which bridges the gap in every angular position wherein the cam disc comprises a lateral face and the bearing surfaces present a convex curvature to the lateral face of the cam disc. - View Dependent Claims (9, 10, 11)
- said bristle carrier disc comprising a pair of bearing surfaces and at least one an therebetween;
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12. An electric toothbrush comprising a brush casing, a toothbrush shaft adapted to rotate in said brush casing, and a bristle carrier disc which is connected to one end of said toothbrush shaft by a gear arrangement that converts one-way rotary motion of the toothbrush shaft into a reciprocating rotary motion of the bristle carrier disc;
- said bristle carrier disc comprising a pair of bearing surfaces and at least one gap therebetween;
said gear arrangement comprising an eccentric mounted at said one end of said toothbrush shaft, said eccentric engaging in said gap in the bristle carrier disc, and wherein the eccentric is formed by at least one cam disc which bridges the gap in every angular position wherein the gap is formed between two follower pins projecting from a lower end face of the bristle carrier disc and the follower pins comprise the bearing surfaces. - View Dependent Claims (13, 14, 15, 16)
- said bristle carrier disc comprising a pair of bearing surfaces and at least one gap therebetween;
Specification