JP2002000353A - Plastic molding with heat deformable engaging part made of biodegradable plastic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a tough engaging part which can be attached or detached by hot water at the time of an assembly, a repair, a checkup, and a replacement, to provide a sanitary toothbrush with which dirt is not accumulated at the end of a handle and the brush of which its easily altered, and to contribute to environmental protection by reducing the amount of disposed handles of the toothbrush as a result. SOLUTION: When a plastic molding has a engaging part with a three- dimensional shaped material made of biodegradable plastics, the engaging part has the following features. The engaging part has a size and a structure softening and deforming at a temperature of 80 degrees. At least, one of the parts is made of the biodegradable plastics, and parts are engaged together by a shape memory property of the biodegradable plastics. A toothbrush is provided a ring-shaped setting part at its end. A brush for replacement is put into the setting part, and tough bonding is realized by the engaging means so that the handle and the brush do not easily separate when using the toothbrush.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention realizes a robust fitting portion that can be attached and detached with hot water at a fitting portion of a plastic that needs to be assembled, repaired, inspected, or replaced.

[0002]

2. Description of the Related Art Conventional plastic fitting portions are fitted by using grooves or claws. These include assembly, repair, inspection,
At the time of replacement, the fitting part was forced to spread, causing the plastic fitting part to be damaged and the plastic fitting part to be broken at the time of repair, inspection and replacement. In addition, if the fitting is loosened and the removal is facilitated to prevent these problems, the result is easy to come off.

[0003] Most conventional toothbrushes have a result that they are discarded from the handle when the toothbrush is replaced because the brush portion is not replaceable. There is a lot of waste and there is a problem in terms of environmental destruction.

[0004] Replaceable brushes have the form shown in Fig. 1, but since the bottom of the tip is closed (sack-like), dirt and the like tend to accumulate, and the dirt makes it difficult to mount the replacement brush. There was a problem. In order to prevent such a problem, as a method for preventing the formation of a gap, there is a method of increasing the accuracy of the fitting portion or using a soft material for the fitting portion, but it is likely to be expensive. In addition, it took time to separate the brush part because of the bag shape.

[0005]

In a plastic fitting portion which needs to be assembled, repaired, inspected, or replaced, it is easy to attach and detach and realize a robust joint portion.
Reduce environmental destruction.

[0006] In the toothbrush, the replacement brush is easily detached, a sanitary toothbrush in which dirt does not accumulate at the tip of the handle is realized, and the amount of brush handle to be discarded is reduced to reduce environmental destruction.

[0007]

According to the present invention, there is provided a plastic molded product having a fitting portion, wherein a fitting portion using a member having a three-dimensional shape made of biodegradable plastic has a maximum value added to a product to be fitted. Can hold the groove,
Providing any fitting means such as a nail and a tenon, the size of the present invention where the holding force is released at a temperature of about 80 degrees,
A plastic molded product having a structure, wherein at least one is molded from a biodegradable plastic, and the members are fitted together by utilizing thermal deformation of the biodegradable plastic.

The toothbrush of the present invention is characterized in that a ring-shaped set portion is provided at the tip, and a replacement brush is fitted into the set portion, and coupling means are provided so that the handle and the brush portion are not easily detached during use. . The connecting means is set in the mounting and pressing direction when brushing the tooth, and after the setting, it is set to a size that does not protrude in the mounting and pressing direction, and after fitting, by applying heat to the fitting portion, the shape is changed, then cooled, and the fitting force is changed. To achieve a strong connection.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Various embodiments according to the present invention will be described below with reference to the drawings. First, an embodiment of the fitting unit according to the present invention will be described with reference to FIGS. As shown in FIG. 6, the ring 7 in which the biodegradable plastic has been softened by immersing or spraying in hot water is spread out as shown in FIG. 6A, and is set on the ring set portion 8 of the handle 6. By applying heat, the ring 7 is returned by a force for returning the ring 7 to its original shape by shape memory as shown in FIG. As shown in FIG. 7, a plate 10 having one and two protrusions 9 made of biodegradable plastic and having a hole that fits into the protrusions is formed by immersing or applying the protrusions 9 in hot water. After the biodegradable plastic is softened and the plate 10 and the projection 9 are fitted together, one projection is twisted and the two projections are bent, and each projection 9 is cooled and fitted. As shown in FIG.
The groove 11 is made sufficiently small with respect to the protrusion of the nail 5a made of biodegradable plastic. The nail 5a is immersed or poured in hot water, so that the biodegradable plastic is softened. After being deformed small and fitted with the groove portion 11, it is heated again with hot water, returned to the shape before deformation by the shape memory of the biodegradable plastic, cooled and fitted.

Next, a description will be given of a replaceable brush part brush by taking a toothbrush as an example with reference to FIG. As shown in FIG. 2, in the toothbrush of the present embodiment with a replaceable brush part,
The handle is composed of a handle having a ring-shaped set portion 3 at its tip and a replacement brush 1 which is replaceably engaged with the ring-shaped set portion 3, and a coupling means is provided so that the handle and the replacement brush 1 are not easily detached during use. As a connecting means, a set groove portion 2 having a groove around the brush planting portion is provided so that the set portion 3 and the set groove portion 2 fit together. At the time of use, at least one of the ring-shaped set portion 3 and the set groove portion 2 of the replacement brush is made of a biodegradable plastic, is thermally deformed with high-temperature water, is fitted, and then has a dimension that does not pull out or penetrate. The fitting uses the force of returning the shape by heat due to the shape memory of the biodegradable plastic.

Next, referring to FIGS. 3 to 5, a description will be given of a fitting part of the brush part replaceable brush according to the present invention. The fitting portion is provided with a groove, a claw, a tenon, or the like capable of holding a maximum value of a force applied to a product to be fitted, and the size and structure of the fitting portion of the present invention are such that the holding force is released at a temperature of about 80 degrees.
Also, in the replaceable toothbrush, the tip of the toothbrush,
An annular set portion 3 is provided, and the replacement brush 1 is fitted into the set portion. The replacement brush is provided with a set groove portion 2 with a slight groove around the brush planting portion, so that the set portion 3 and the set groove portion 2 fit together. The fitting between the set portion 3 and the set groove portion 2 is set to a dimension (a step of 1 mm to 2 mm) which does not come out and come off. The fitting of the fitting part is
The shape memory of the biodegradable plastic makes use of the force to return the shape by heat. Regarding the use of biodegradable plastic, when using it for the inner material (replacement brush part 1), as shown in FIG. 3, one can soak or immerse in hot water to soften the biodegradable plastic, The ring-shaped claw 4 of the replacement brush unit 1 is deformed as shown in FIG. 3A to facilitate insertion into the handle, and after the replacement brush unit 1 is inserted into the handle, the ring-shaped claw 4 of the replacement brush unit 1 is moved to FIG. Return to the original shape, cool and fit. Next, as shown in FIG. 4, the biodegradable plastic is softened by dipping or spraying in hot water, and the nail 5 of the replacement brush part 1 is bent inward as shown in FIG. 4A to facilitate insertion into the handle. After inserting the replacement brush portion 1 into the handle, heat is applied to the claw 5 of the replacement brush portion 1 to return it to its original shape by shape memory as shown in FIG. When using biodegradable plastic for the outer material (set part 3),
One is to dip or immerse in hot water as shown in FIG. 5 to soften the biodegradable plastic, spread the set part 3 of the replacement brush part 1 as shown in FIG. 5A, and set the replacement brush 1 After the insertion into the part, heat is applied to the set part 3 of the replacement brush part 1 and returned by the force to return to the original shape by shape memory as shown in FIG. This time, the use of biodegradable plastic was divided into inside and outside, and the examples were written.However, it is not always necessary to use inside and outside as in the example, and at least one uses biodegradable plastic. It should just be. When the replacement brush is sold, the fitting portion is thermally deformed. For example, in the case of the nail fitting shown in FIG. 4, the nail portion is narrowed and sold. This allows the user to easily insert and immerse in hot water to spread the claws and secure the fit. It is also possible to make it easy to fit.

Although this embodiment relates to a toothbrush of a hand-brush type, it can be applied to an electric toothbrush in the same manner. Here, a toothbrush is described, but the same can be applied to a brush having a general handle.

[0013]

According to the present invention, when the brush is replaced, the waste is reduced because only the tip is used, the environment is protected, and bacteria are decomposed in the soil because biodegradable plastic is used. Moreover, even if it burns, it has little effect on the environment. The replacement brush can be easily attached and detached by attaching the planting head to hot water. In addition, when the toothbrush is deformed in hot water and firmly meshed, the risk of the tip portion being detached and swallowing during use of the toothbrush is greatly reduced. Since the set portion of the tip brush portion is open, dirt hardly accumulates and is sanitary. It is inexpensive due to its simple structure.

[0014]

[Brief description of the drawings]

FIG. 1 shows an example of a replacement brush with a set part closed.

FIG. 2 is an explanatory view of an exchangeable toothbrush according to the present invention.

FIG. 3 is an explanatory view of an exchangeable toothbrush having a ring-shaped fitting portion in the present invention.

FIG. 4 is an explanatory view of an exchangeable toothbrush having a claw-shaped thermal deformation fitting portion according to the present invention.

FIG. 5 is an explanatory diagram of an exchangeable toothbrush that thermally deforms an outer ring according to the present invention.

FIG. 6 is an explanatory diagram showing a fitting method using an external ring according to the present invention.

FIG. 7 is an explanatory diagram showing a fitting method using a tenon according to the present invention.

FIG. 8 is an explanatory view showing a fitting method of inserting a nail into a groove according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Replacement brush 2 ... Set groove part 3 ... Set part 4 ... Ring-shaped claw 5, 5a ... Claw 6 ... Pattern 7 ... Ring 8 ... Ring set part 9 ... Convex part 10 ... Plate 11 ... Groove

Claims (2)

[Claims] 1. A fitting portion using a member having a three-dimensional shape made of a biodegradable plastic, at least one of which is formed of a biodegradable plastic, and the members are fitted by utilizing thermal deformation of the biodegradable plastic. Plastic molded products characterized by the following. 2. A replaceable brush part brush having the fitting part according to claim 1 in a brush replacement part.