CZ317995A3 - Toothbrush with curved hairs and process for producing thereof - Google Patents

Description

Toothbrush with curved bristles and method of its manufacture

Technical field

BACKGROUND OF THE INVENTION The present invention relates to a curved bristled toothbrush based on a fixed curved rod and to a method for its manufacture.

BACKGROUND OF THE INVENTION

All of the prior art toothbrushes currently used operate on the common principle that the straight toothbrush bristles directly perpendicular or at a slight angle into the toothbrush body. The working end of the bristles is modified and edited in various ways. so that the resulting shape of the functional surface of the bristles best matches the profile of the teeth. This type of card works on the principle of a fixed straight bar.

A solution is disclosed in DE 4417 548 A1, according to which the bristles are fixed in a replaceable rubber body which is fixed to the brush body by means of projections. Although elastic rubber washers are used, it is still a fixed straight bar, not an angled bar, which allows the individual bristles to be compressed according to the shape of the teeth to be cleaned.

A disadvantage of these solutions is the inflexibility of the functional surface of the bristles to the profile of the surface to be cleaned, i.e. the profile of the teeth. The forces acting perpendicular to the bristle cross-sections do not induce any longitudinal deformation of the bristles up to a certain critical force, which causes their fixed longitudinal deformation, while the bristle length change is non-linear - a break.

Another disadvantage is that the straight, fixed bristles do not allow to react to individual unevenness of the tooth profile. Some manufacturers use a solution with a central elastic portion of the toothbrush body to increase the flexibility of the toothbrush. While this type of brush increases the flexibility of the functional sheet of the toothbrush as a whole, it does not allow to react to individual unevenness of the cleaned surface. It is a classic solution of a toothbrush with fixed straight bristles placed on the elastic end.

SUMMARY OF THE INVENTION

The aforementioned drawbacks are largely eliminated by a curved bristle toothbrush and a method of making the same, characterized in that the lower part of the toothbrush body is firmly connected to a rigid-veg foam fixing pad lined with a rigid edge, with straight bristles firmly connected to the toothbrush body on the base of the fixed curved rod through the fixing pad and the fixed edge.

A method for manufacturing a curved bristle toothbrush is to have a rigidly bonded, rigidly bonded, rigid foam rubber pad being laterally compressed and deflected, and straight bristles are inserted obliquely or perpendicularly into the toothbrush body. By releasing the lateral pressure, the rigid foam rubber washer returns to its original position and deflects the straight bristles to the fixed curved beam position.

Another option is. that the straight bristles are inserted obliquely into the toothbrush body via a rigid foam rubber pad with a fixed edge which is in a free position. After the bristles have been fixed, the rigid foam rubber washer is laterally compressed and fixed to the toothbrush body so that the straight bristles assume the desired position of the curved bar.

The elasticity of the rigid foam rubber pad together with the elasticity of the straight bristles mounted on a fixed curved rod virtually replace the spring function and allow the elasticity of each point of the toothbrush functional area, allowing copying even

profile of teeth and individual tooth inequalities.

Applying the principle of a fixed curved beam allows a linear change in the length deformation of the bristle-in-dependence on the force-acting perpendicular to the bristle cross-section and allows to react to the individual irregularities of the tooth profile.

BRIEF DESCRIPTION OF THE DRAWINGS

Giant. 1 shows a cross-section of a toothbrush body and a method for attaching bristles on the principle of a fixed curved rod.

Giant. 2 shows the resilience of the individual bristles of the functional surface of the toothbrush to the tooth profile and the individual irregularities.

Exemplary embodiment

Example 1

To the lower part of the plastic toothbrush body 3, a fixing pad 2 of tough foam rubber is glued, which is lined with a rigid edge 4. The fixing pad 2 is laterally compressed and deflected from its original position. The straight bristles 1 are inserted obliquely or perpendicularly through the fixing pad 2 into the toothbrush body 3. By releasing the lateral pressure, the fixing pad 2 returns to its original position and deflects the straight bristles 1 to the position of the pinned curved bar.

Example 2

To the lower part of the plastic toothbrush body 3, a fixing pad 2 of tough foam rubber is glued, which is lined with a rigid edge 4. Straight bristles 1 are clamped obliquely through the fixing pad 2 into the toothbrush body 3. After the bristles 1 have been fixed, the fixing pad 2 is laterally compressed and fixed to the toothbrush body 3 so that the straight bristles assume the desired position of the curved bar.

Claims (8)

PATENT CLAIMS 1) A toothbrush with curved bristles, the bottom of which is firmly connected by a 5 fixing pad, characterized in that the fixing pad (2) is flanked by a fixed edge (4), wherein the straight bristles (1) are rigidly connected through the fixing pad (2) and the fixed edge (4) to the toothbrush body (3) based on a fixed curved rod 2) 1, characterized in that the fixing pad is made of a tough foam rubber. Method for producing a toothbrush according to claims 1 and 2, characterized in that the fixing pad (2) with the fixed edge (4) is compressed laterally and deflected and the straight bristles (1) are wed over the fixing pad (2) and the fixed edge (4). 4) into the lower part of the toothbrush body (3) and after releasing the lateral pressure on the fixation pad (2) with the fixed edge (4), the fixation pad (2) returns to its original position and deflects straight bristles to the fixed curved rod position. The method according to claim 3, characterized in that the straight bristles (1) wedge into the lower part of the toothbrush body (3) at an angle of 30 to 43 degrees. Method according to claim (3), characterized in that the straight bristles (1) are fixed perpendicularly to the lower part of the toothbrush body (3). A method according to claims 1 and 2, characterized in that the straight bristles (1) engage in the lower part of the toothbrush body (3) via a fixing pad (2) and a fixed edge (4) which are in a free position and after engagement. In the case of straight bristles (1), the fixation pad (2) and the fixed edge (4) without the lower part of the toothbrush body (3) are deflected laterally and fixed. The method according to claim 6, characterized in that the straight bristles (1) wedge into the lower part of the body (3) at an angle of 30 to 45 degrees. A method according to claim 6, characterized in that the straight bristles (1) are inserted perpendicularly to the lower part of the toothbrush body (3).