# US 8,739,351 B2 · Toothbrush

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- Number: US 8,739,351 B2
- Document ID: US8739351B2
- Status: Granted
- Kind: B2
- Application number: 13/233,776
- Filed: 2011-09-15
- Published: 2012-02-16
- Granted: 2014-06-03
- Earliest claimed: 2009-03-18
- Assignees: Braun GmbH
- Applicants: Bjoern Kling; Andreas Birk
- Inventors: Bjoern Kling; Andreas Birk
- Web page: https://patentgrep.com/patent/US8739351B2

## CPC

- A46B 5/0054: {designed to allow relative positioning of the head to body}
- A46B 5/0066: {Flexible resilience by elastic deformation of the material}
- A46B 5/026: {Grips or handles having a nonslip section}
- A46B 15/0002: {Arrangements for enhancing monitoring or controlling the brushing process}
- A46B 15/0012: {with a pressure controlling device}
- A46B 2200/1066: Toothbrush for cleaning the teeth or dentures (A61C17/16 takes precedence; bristles arrangements for toothbrushes A46B9/04)
- A46B: BRUSHES (handles not integral with brushware B25G)

## Abstract

A toothbrush having a handle, a head with oral care elements and a neck connecting the head with the handle is described. The toothbrush has a base structure of the handle, and the neck and the head are formed by a hard plastic component. Said basic structure of the handle is covered, at least in part, by a first soft plastic component. Said head including a second soft plastic component and said neck including a through-opening, wherein at least one section of a boundary wall of the opening is provided with an elastic muscle.

## Claims

### Claim 1

A toothbrush having a handle, a head with oral care elements and a neck connecting the head with the handle, the toothbrush further comprising a base structure of the handle, the neck and the head being formed by a hard plastic component, said base structure of the handle being covered at least in part by a first soft plastic component, said head including a second soft plastic component and said neck including a through-opening wherein at least one section of a boundary wall of the opening is provided with an elastic muscle, wherein the opening is encompassed by two lateral boundary walls, one front boundary wall adjacent to the head and one rear boundary wall arranged adjacent to the handle, with the elastic muscle being provided only at one of the lateral, front or rear boundary walls, and wherein the opening has a width of between about 1.5 mm to about 7 mm between the two lateral boundary walls.

### Claim 2 (depends on 1)

The toothbrush according to claim 1, wherein the elastic muscle is formed by a third soft plastic component.

### Claim 3 (depends on 2)

The toothbrush according to claim 2, wherein the third soft plastic component is identical to the first soft plastic component.

### Claim 4 (depends on 1)

The toothbrush according to claim 1, wherein the opening has a length of between about 10 mm to about 35 mm between the front and the rear boundary walls.

### Claim 5 (depends on 4)

The toothbrush according to claim 4, wherein the opening has an essentially triangular or oval cross section.

### Claim 6 (depends on 1)

The toothbrush according to claim 1, wherein structural openings are provided in the base structure of the handle which extend in the same vertical direction as the opening in the neck.

### Claim 7 (depends on 1)

The toothbrush according to claim 1, wherein the handle is configured such that its flexural elasticity in a vertical direction, in a region between a thumb rest and an index finger rest adjacent to the neck, is at least 50% greater than its flexural elasticity in a direction turned through 90° transverse thereto over the side of the handle in the same position of the longitudinal extension of the handle.

### Claim 8 (depends on 1)

The toothbrush according to claim 1, wherein the handle is configured such that its flexural elasticity in a vertical direction, in a region between a thumb rest and an index finger rest adjacent to the neck, is at least 50% greater than its flexural elasticity in the same vertical direction in a central section of the handle mid-way between a free rear end and a front end of the handle adjacent to the neck.

### Claim 9 (depends on 1)

The toothbrush according to claim 1, wherein a flexural elasticity in a vertical direction around the center of the neck is greater than a flexural elasticity in a vertical direction of the handle around a center of the thumb rest at a front end of the handle adjacent to the neck.

### Claim 10 (depends on 1)

The toothbrush according to claim 1, wherein a flexural elasticity in a vertical direction of a section of the head is greater than a flexural elasticity in the vertical direction around the center of the neck.