Patent Publication Number: US-8973203-B2

Title: Toothbrush

Description:
TECHNICAL FIELD 
     The invention is directed to a toothbrush having male and/or female parts on an installation head at a fore-end of the toothbrush, on the lateral surfaces of a replaceable bristle part and on the toothbrush body. 
     BACKGROUND OF THE INVENTION 
     In some conventional toothbrushes, the whole fore-end of the toothbrush which constitutes ⅓ of the full length of the toothbrush can be exchanged. In addition, toothbrushes other than those mentioned above are usually discarded as a trash after use. These discarded toothbrushes generate collection costs and carbon dioxide when transport and incineration are performed. 
     DISCLOSURE OF THE INVENTION 
     Technical Problem 
     Discarding an entire toothbrush after use was the only method for conventional toothbrushes. 
     In addition, a conventional installation head at the fore-end of the toothbrush, as the head is formed thin and oval, can become separated during use, and can damage the mouth by splitting and/or breaking since the head is shaking from side to side. 
     This invention solves the problems of the compositions of conventional toothbrushes. The purposes of this invention are to permit repeated use of a toothbrush body for a long period and to reduce the consumption of resources and carbon dioxide production by forming curved or “&lt;” shaped male and female parts at lateral surfaces of both an exchangeable bristle part and the head of the fore-end of tooth brush body, thereby making it possible to assemble and detach the bristle part with ease and freely and to exchange the bristle part with ease. 
     Means for Solving the Problem 
     This section explains the toothbrush invention in order to solve the challenges described above. 
     A toothbrush  1 ,  2 ,  3  according to the present invention is characterized by a toothbrush body  4 ,  5 ,  6  having a fore-end; a head  7 ,  8 ,  9  having a circular female part  12 ,  13 ,  14  or male part  15 ,  16 ,  17  and being located at the fore-end of the toothbrush body; and a replaceable bristle part  11  having bristles  19  installed at a board  10  with a circular female part  12 ,  13 ,  14  or male part  15 ,  16 ,  17 , the circular female part or male part of the board  10  being attached to the circular male part or female part of the head  7 ,  8 ,  9  by mutual elastic deformation, the female part  14  or male part  17  of the head  7 ,  8 ,  9  and the female part  14  or male part  17  of the board  10  being aligned with the toothbrush body  4 ,  5 ,  6 . 
     Because the installation head at the fore-end of the toothbrush body as described above has a thin and oval shape in front of the rod shaped toothbrush body, it separates during tooth brushing, shakes laterally, cracks, fractures and may damage the mouth. As such, it is desirable that the plastic materials used in the toothbrush body are soft and do not have cracking or fracturing characteristics such as those of elastic polypropylene. 
     In  FIG. 70 , however, as both the inner lateral surfaces of the head  32  for the bristle part  33  at the fore-end of the toothbrush body  31  of the conventional toothbrush  30  and the lateral surfaces of the bristle part  33  are curved or “&lt;” shaped, the fore-end head portion of the toothbrush body for bristle part  33  shakes laterally when the toothbrush  30  is used as described above. 
     The present toothbrush invention is characterized in that shaking is prevented because of the male part  17  or female part  14  of the board  10  having the toothbrush body  4 ,  5 ,  6  direction and the female part  14  or male part  17  of the head  7 ,  8 ,  9  having the toothbrush body  4 ,  5 ,  6  direction. 
     In addition, although not drawn, the shape of the male and female parts are preferably curved and/or in a “&lt;” shape. But if it&#39;s possible to be assembled and detached and prevents detaching while brushing teeth, the shape is not confined to a specific form. 
     As described above, the oval shapes of the head  7 ,  8 ,  9  of the toothbrush  1 ,  2 ,  3  and the board  10  are preferable, but not confined. 
     In addition, though it is desirable for the shape of the upper surface of a bristle part, when assembled in the head to be parallel (same surface) or in a curved shape relative to the upper surface, the shape is not confined to this specific form so long as it does not cause scars in the mouth. 
     In addition, although it is desirable for the male and female shapes on bristle part and toothbrush body to be capable of assembly and fit snugly and symmetrically, it is not confined to this embodiment. 
     In addition, when the bristle part is assembled in the head, the stopper for preventing drop out is located around the bottom of bristle part. 
     In addition, though it is desirable for the shape of outer stem surface of the stopper to have the same shape as the external lateral surface around the bottom of the head, but is not confined to this embodiment. 
     Effect of Invention 
     There is no need to destroy a whole toothbrush after using it. By only exchanging a bristle head, it is possible to reuse the body of a toothbrush continuously for a long period. 
     Reuse of the toothbrush  1 ,  2 ,  3  and the toothbrush body  4  are desirable, but not so confined. 
     As a result, it is possible to reduce the amount of raw material consumed and, as an indirect effect, it becomes possible to reduce carbon dioxide emissions that occur during raw material transport or product manufacturing processes, etc. 
     In addition, for trash reduction, it becomes possible to reduce transportation or incineration maintenance, etc. which are related to conventional disposal. 
     In addition, as an effect of reducing trash, incineration expenses for incineration processing may be reduced, and a large reduction in carbon dioxide emissions will be possible at the same time. 
     In addition, this toothbrush can contribute to reducing carbon dioxide emissions and saving of raw materials by simply exchanging the bristle part and reusing the toothbrush body rather than discarding the whole toothbrush in every 2-3 months. 
     In addition, except for hotel and/or electric toothbrush uses, the total consumption amount of toothbrush is statistically 300 to 400 million pieces a year. Additionally, about 6 thousand tons of plastics and packing materials are consumed. If a toothbrush body is used for 2-3 years, carbon dioxide emission may be reduced during any incineration process and there will be large amounts of raw material reduction. 
     In addition, materials used for exchangeable bristle parts are extremely small, the unit production cost becomes cheap, and thus, providing cheap toothbrushes becomes possible. 
     In addition even though there is now a high level of eco-awareness about global warming according to TV or newspaper surveys, it is hard for people to know specifically what methods there are to participate in the environmental protection movement in their lives even if they are eager to. However, in the case of toothbrushes used by most people in their lives, even if it is small, this toothbrush with exchangeable bristle part makes people have a sense that they are involved in the environmental protection movement. 
     However, in case of using a toothbrush—which includes an assembly of the bristle part to the head on the fore-end of the toothbrush body, as described in  FIG. 70 , so the lateral surfaces  36 ,  37  of head  32  for the bristle part  33  at the fore-end of the toothbrush body  31  of the toothbrush  30  are curved and/or “&lt;” shaped female-male parts  34 ,  35 , the fore-end part of the toothbrush which has bristle part  33  shakes laterally during tooth brushing. 
     As a way to solve the undesirable mechanism mentioned above, the present invention is characterized in that shaking is prevented between the male part  17  or female part  14  of board  10  having toothbrush  1 ,  2 ,  3  direction and the female part  14  or male part  17  of the head  7 ,  8 ,  9  having toothbrush  1 ,  2 ,  3  direction. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a plane figure of a toothbrush body fore-end. 
         FIG. 2  is a plane figure of a bristle part. 
         FIG. 3  is a lateral view of a bristle part. 
         FIG. 4  is a lateral view of a toothbrush with  FIG. 3  being installed in  FIG. 1 . 
         FIG. 5  is a basal view of  FIG. 4 . 
         FIG. 6  is a A-A′ line cross-sectional view of  FIG. 4 . 
         FIG. 7  is a plane figure of a toothbrush body fore-end. 
         FIG. 8  is a plane figure of a bristle part. 
         FIG. 9  is a lateral view of a bristle part. 
         FIG. 10  is a lateral view of a toothbrush with  FIG. 9  being installed in  FIG. 7 . 
         FIG. 11  is a basal view of  FIG. 10 . 
         FIG. 12  is a A-A′ line cross-sectional view of  FIG. 10 . 
         FIG. 13  is a plane figure of a toothbrush body fore-end. 
         FIG. 14  is a plane figure of a bristle part. 
         FIG. 15  is a lateral view of a bristle part. 
         FIG. 16  is a lateral view of a toothbrush with  FIG. 15  being installed in  FIG. 13 . 
         FIG. 17  is a basal view of  FIG. 16 . 
         FIG. 18  is a A-A′ line cross-sectional view of  FIG. 16 . 
         FIG. 19  is a plane figure of a toothbrush body fore-end. 
         FIG. 20  is a plane figure of a bristle part. 
         FIG. 21  is a lateral view of a bristle part. 
         FIG. 22  is a lateral view of a toothbrush with  FIG. 21  being installed in  FIG. 19 . 
         FIG. 23  is a basal view of  FIG. 22 . 
         FIG. 24  is a A-A′ line cross-sectional view of  FIG. 22 . 
         FIG. 25  is a plane figure of a toothbrush body fore-end. 
         FIG. 26  is a plane figure of a bristle part. 
         FIG. 27  is a lateral view of a bristle part. 
         FIG. 28  is a lateral view of a toothbrush with  FIG. 27  being installed in  FIG. 25 . 
         FIG. 29  is a basal view of  FIG. 28 . 
         FIG. 30  is a A-A′ line cross-sectional view of  FIG. 28 . 
         FIG. 31  is a plane figure of a toothbrush body fore-end. 
         FIG. 32  is a plane figure of a bristle part. 
         FIG. 33  is a lateral view of a bristle part. 
         FIG. 34  is a lateral view of a toothbrush with  FIG. 33  being installed in  FIG. 31 . 
         FIG. 35  is a basal view of  FIG. 34 . 
         FIG. 36  is a A-A′ line cross-sectional view of  FIG. 34 . 
         FIG. 37  is a plane figure of a toothbrush body fore-end. 
         FIG. 38  is a basal view of  FIG. 37 . 
         FIG. 39  is a plane figure of a bristle part. 
         FIG. 40  is a basal view of  FIG. 39 . 
         FIG. 41  is a lateral view of a bristle part. 
         FIG. 42  is a C-C′ line cross-sectional view with the bristle part of  FIG. 41  being attached in  FIG. 37 . 
         FIG. 43  is a lateral view of a bristle part. 
         FIG. 44  is a C-C′ line cross-sectional view with the bristle part of  FIG. 43  being attached in  FIG. 37 . 
         FIG. 45  is a lateral view of a bristle part. 
         FIG. 46  is a C-C′ line cross-sectional view with the bristle part of  FIG. 45  being attached in  FIG. 37 . 
         FIG. 47  is a lateral view of bristle part. 
         FIG. 48  is a C-C′ line cross-sectional view with the bristle part of  FIG. 47  being attached in  FIG. 37 . 
         FIG. 49  is a lateral view of bristle part. 
         FIG. 50  is a C-C′ line cross-sectional view with the bristle part of  FIG. 49  being attached in  FIG. 37 . 
         FIG. 51  is a lateral view of bristle part. 
         FIG. 52  is a C-C′ line cross-sectional view with the bristle part of  FIG. 51  being attached in  FIG. 37 . 
         FIG. 53  is a plane figure of a toothbrush body fore-end. 
         FIG. 54  is a basal view of  FIG. 53  with the bristle part of  FIG. 55  being attached. 
         FIG. 55  is a plane figure of a bristle part. 
         FIG. 56  is a basal view of bristle part of  FIG. 55 . 
         FIG. 57  is a lateral view of a bristle part. 
         FIG. 58  is a D-D′ line cross-sectional view with the bristle part of  FIG. 57  being attached to FIG.  53 &#39;s toothbrush body. 
         FIG. 59  is a lateral view of a bristle part. 
         FIG. 60  is a D-D′ line cross-sectional view with the bristle part of  FIG. 59  being attached to FIG.  53 &#39;s toothbrush body. 
         FIG. 61  is a later view of a bristle part. 
         FIG. 62  is a D-D′ line cross-sectional view with the bristle part of  FIG. 61  being attached to FIG.  53 &#39;s toothbrush body. 
         FIG. 63  is a lateral view of a bristle part. 
         FIG. 64  is a D-D′ line cross-sectional view with the bristle part of  FIG. 63  being attached to the toothbrush body of  FIG. 53 . 
         FIG. 65  is a lateral view of a bristle part. 
         FIG. 66  is a D-D′ line cross-sectional view with the bristle part of  FIG. 65  being attached to the toothbrush body of  FIG. 53 . 
         FIG. 67  is a lateral view of a bristle part. 
         FIG. 68  is a D-D′ line cross-sectional view with the bristle part of  FIG. 67  being attached to the toothbrush body of  FIG. 53 . 
         FIG. 69  is a B-B′ line cross-sectional view of a bristle part. 
         FIG. 70  is a reference drawing illustrating a fore-end of brush that is shaking to the left and right. 
     
    
    
     THE BEST FORM FOR IMPLEMENTATION OF INVENTION 
     As described below, a first embodiment of the invention is explained by  FIGS. 1 to 6 . 
       FIG. 1  is a plane figure of a toothbrush body  4  of toothbrush  1  which has an installation head  7  at a fore-end part. Fore-end inner lateral surfaces  21 ,  22  of toothbrush body  4  are connected to the head  7  which has reciprocal curvatures for installing the bristle part  11  in  FIG. 3  which has curved lateral male parts  15 ,  16 ,  17 . Both sides of head  7  and the bristle part  11  have female and male parts  14 ,  17  to prevent the fore-end of the toothbrush from shaking while brushing with the toothbrush  1 . 
       FIG. 2  is a plane figure of bristle part  11  with board  10  which is attached to the head  7 . 
     Elements  23  and  24  are both left and right lateral surfaces. Element  17  is a male part of bristle part  11  for preventing shaking when connected to the female part  14  of  FIG. 1 . 
     Element  20  is the stopper to prevent dropping out when assembled to the head  7 . 
     In  FIG. 3 , Element  20  is the stopper as a dropping prevention mechanism when the bristle part  11  is assembled to the head  7  around the bottom of the board  10 . Elements  15 ,  16 ,  17  of both lateral fore-end are convex male parts. Especially, Element  17  is the male part to prevent the fore-end of the bristle part from lateral shaking. Element  19  is bristle enrooted. This is a lateral view of male parts  15 ,  16 ,  17  with the shaking prevention curvatures on the bristle part  11 . 
     In  FIG. 4 , Element  1  is toothbrush, and Element  4  is toothbrush body. This is a lateral view of a fore-end of the toothbrush  1  which represents both bristle part  11  of  FIG. 3  and head  7  at the fore-end of the toothbrush body  4  for bristle part  11 . Element  19  is bristles of a toothbrush. Element  20  is the stopper as described above. 
       FIG. 5  is a basal view of  FIG. 4 . Element  10  is a board, Element  1  is a toothbrush, and Element  4  is a toothbrush body. Element  20  is the stopper described above, Element  19  is rooted brushes, Element  14  represents female part  14  in board and male part  17  in toothbrush body  4  as a shaking prevention device when bristle part  11  is assembled to toothbrush body  4 . 
       FIG. 6  is a A-A′ line cross-sectional view of  FIG. 4 . Element  1  is a toothbrush, and Element  4  is a toothbrush body. Element  10  is a head, Element  11  is a bristle part, Element  19  is bristles and Element  20  is a stopper. Element  12 ,  14  are female parts which have a concave inside  21 ,  22  of the toothbrush body  4 . Element  14 ,  17  are male parts which have a convex lateral  23 ,  24  to bristle part  11 . 
     This implementation example is toothbrush  1  as stated above, and the stopper  20  at bristle part  11  is designed to protrude from the bottom of the head  7  when the bristle part  11  is assembled to the head  7  of the toothbrush body  4 . 
     As described below, a second embodiment of the invention is shown in  FIG. 7  to  FIG. 12 . 
       FIG. 7  is a plane figure of toothbrush body  4  of toothbrush  1  which has installation head  7  at the fore-end part. Fore-end inner lateral surfaces  21 ,  22  of toothbrush body  4  are head  7  which have reciprocal curvatures to admit the bristle part  11  of  FIG. 3  which has curved lateral male parts  15 ,  16 ,  17 . Both sides of head  7  and the bristle part  11  have female and male parts  14 ,  17  to prevent the fore-end of the toothbrush from shaking while brushing with the toothbrush  1 . 
       FIG. 8  is a plane figure of bristle part  11  with board  10  which is attached to the head  7 . Elements  23 ,  24  are both left and right lateral surfaces. Element  17  is a male part of bristle part  11  for preventing shaking when attached to female part  14  of  FIG. 1 . 
     Element  20  is the stopper to prevent dropping when assembled to the head  7 . 
     In  FIG. 9 , Element  20  is the stopper as a dropping prevention mechanism when the bristle part  11  is assembled to the head  7  around the bottom of the board  10 . Elements  15 ,  16 ,  17  of both lateral fore-ends are convex male parts. Especially, Element  17  is the male part to prevent the fore-end of the bristle part from lateral shaking Element  19  is enrooted bristles. This is a lateral view of male parts  15 ,  16 ,  17  with the shaking prevention curvatures on the bristle part  11 . 
     In  FIG. 10 , Element  1  is a toothbrush, and Element  4  is a toothbrush body. This is lateral view of fore-end of the toothbrush  1  which represents both bristle part  11  of  FIG. 9  and head  7  at the fore-end of the toothbrush body  4  for bristle part  11 . Element  19  is bristles. Element  20  is the stopper as described above. 
       FIG. 11  is a basal view of  FIG. 10 . Element  10  is a board, Element  1  is a toothbrush, and Element  4  is a toothbrush body. Element  20  is the aforementioned stopper, Element  19  is rooted brushes, and Element  14  represents female part  14  in the board and male part  17  in the toothbrush body  4  as a shaking prevention device when bristle part  11  is assembled to toothbrush body  4 . 
       FIG. 12  is a A-A′ line cross-sectional view of  FIG. 10 . Element  1  is a toothbrush, and Element  4  is a toothbrush body. Element  10  is a head, Element  11  is a bristle part, Element  19  is bristles and Element  20  is a stopper. Elements  12 ,  14  are female parts which have concave inside  21 ,  22  of the toothbrush body  4 . Element  14 ,  17  are male parts which have convex lateral surfaces  23 ,  24  to bristle part  11 . 
     This implementation example is constituted toothbrush  1  described above. It is formed to be in the same plane (even level) between the head  7  base and the stopper  20  of the bristle part  11  when bristle part  11  is attached to the head  7  of the toothbrush body  4 . 
     A third embodiment of the invention is explained by  FIGS. 13 to 18  as follows. 
       FIG. 13  is a plane figure of toothbrush body  4  of toothbrush  1  which has installation head  7  at the fore-end part. Fore-end inner lateral surfaces  21 ,  22  of toothbrush body  4  are head  7  which has reciprocal curvatures to admit the bristle part  11  in  FIG. 3  which has curved lateral male parts  15 ,  16 ,  17 . Both sides of head  7  and the bristle part  11  have female and male parts  14 ,  17  to prevent the fore-end of the toothbrush from shaking while brushing with the toothbrush  1 . 
       FIG. 14  is a plane figure of bristle part  11  with board  10  which is attached to the head  7 . Elements  23 ,  24  are both left and right lateral surfaces. Element  17  is male part of bristle part  11  for preventing shaking when attached to female part  14  of  FIG. 1 . 
     Element  20  is the stopper to prevent dropping when assembled to the head  7 . 
     In  FIG. 15 , Element  20  is the stopper to prevent dropping when the bristle part  11  is attached to the head  7  around the bottom of the board  10 . Elements  15 ,  16 ,  17  of both lateral fore-ends are convex male parts. Especially, Element  17  is the male part to prevent the fore-end of the bristle part from shaking laterally. Element  19  is rooted bristles. This is a lateral view of male parts  15 ,  16 ,  17  with the shaking prevention curvatures on the bristle part  11 . 
     In  FIG. 16 , Element  1  is a toothbrush, and Element  4  is a toothbrush body. This is lateral view of the fore-end of the toothbrush  1  which represents both bristle part  11  of  FIG. 15  and head  7  at the fore-end of the toothbrush body  4  for bristle part  11 . Element  20  is a stopper, Element  19  is bristles. 
       FIG. 17  is a basal view of  FIG. 16 . Element  10  is a board, Element  1  is a toothbrush, and Element  4  is a toothbrush body. Element  20  is the aforementioned stopper, Element  19  is rooted brushes, and Element  14  represents female part  14  in the board and male part  17  in toothbrush body  4  as a shaking prevention device when bristle part  11  is attached to toothbrush body  4 . 
       FIG. 18  is a A-A′ line cross-sectional view of  FIG. 16 . Element  1  is a toothbrush, and Element  4  is a toothbrush body. Element  10  is a head, Element  11  is a bristle part, Element  19  is bristles and Element  20  is a stopper. Elements  12 ,  14  are female parts which have concave inside  21 ,  22  of the toothbrush body  4 . Element  14 ,  17  are male parts which have convex lateral surfaces  23 ,  24  to bristle part  11 . 
     This implementation example is the toothbrush  1  as described above, it is formed to be in the same level between the bottom of the head  7  and the bottom of the male part  16 ,  17  of the bristle part  11 , when the bristle part  11  is assembled to the head  7  of the toothbrush body  4 . 
     As described below, a fourth embodiment of the invention is explained by  FIGS. 19 to 24 . 
       FIG. 19  is a plane figure of toothbrush body  4  of a toothbrush  1  which has an installation head  7  at the fore-end part. Fore-end inner lateral surfaces  21 ,  22  of toothbrush body  4  are head  7  which is “&lt;” shaped to admit the bristle part  11  in  FIG. 3  which has “&lt;” shaped both right and left lateral male parts  15 ,  16 ,  17 . Both sides of head  7  and the bristle part  11  have female and male parts  14 ,  17  to prevent the fore-end of the toothbrush from shaking during brushing with the toothbrush  1 . 
       FIG. 20  is a plane figure of bristle part  11  with board  10  which is attached to the head  7 . Elements  23 ,  24  are both left and right lateral surfaces. Element  17  is male part of bristle part  11  for preventing shaking when attached to female part  14  of  FIG. 1 . 
     Element  20  is the stopper for preventing dropping when attached to the head  7 . 
     In  FIG. 21 , Element  20  is the stopper for preventing dropping when the bristle part  11  is attached to the head  7  around the bottom of the board  10 . Elements  15 ,  16 ,  17  of both lateral fore-end are “&lt;” shaped male parts. Especially, Element  17  is the male part to prevent the fore-end of the bristle part from shaking laterally. Element  19  is rooted bristles. This is a lateral view of male parts  15 ,  16 ,  17  with the shaking prevention “&lt;” shape on the bristle part  11 . 
     In  FIG. 22 , Element  1  is a toothbrush, and Element  4  is a toothbrush body. This is lateral view of fore-end of the toothbrush  1  which represents both bristle part  11  of  FIG. 21  and head  7  at the fore-end of the toothbrush body  4  for bristle part  11 . Element  19  is bristles. Element  20  is the stopper as described above. 
       FIG. 23  is a basal view of  FIG. 22 . Element  10  is boards, Element  1  is a toothbrush, and Element  4  is a toothbrush body. Element  20  is the aforementioned stopper, Element  19  is rooted brushes, and Element  14  represents female part  14  in the board and male part  17  in the toothbrush body  4  as a shaking prevention device when bristle part  11  is attached to toothbrush body  4 . 
       FIG. 24  is a A-A′ line cross-sectional view of  FIG. 22 . Element  1  is a toothbrush, and Element  4  is a toothbrush body. Element  10  is a board, Element  11  is a bristle part, Element  19  is bristles and Element  20  is a stopper. Elements  12 ,  14  are female parts which have “&lt;” shaped inside  21 ,  22  of the toothbrush body  4 . Elements  14 ,  17  are male parts which have “&lt;” shaped lateral surfaces  23 ,  24  to bristle part  11 . 
     This implementation example is toothbrush  1  as stated above, and the stopper  20  at bristle part  11  is designed to protrude from the bottom of the head  7  when the bristle part  11  is attached to the head  7  of the toothbrush body  4 . 
     From below, a fifth embodiment of the invention is shown in  FIGS. 25 to 30 . 
       FIG. 25  is a plane figure of toothbrush body  4  of toothbrush  1  which has installation head  7  at the fore-end part. Fore-end inner lateral surfaces  21 ,  22  of toothbrush body  4  are head  7  which is “&lt;” shaped to admit the bristle part  11  in  FIG. 3  which has “&lt;” shaped both right and left lateral male parts  15 ,  16 ,  17 . Both sides of head  7  and the bristle part  11  have female and male parts  14 ,  17  to prevent the fore-end of the toothbrush from shaking during brushing with the toothbrush  1 . 
       FIG. 26  is a plane figure of bristle part  11  with board  10  which is attached to the head  7 . Elements  23 ,  24  are both left and right lateral surfaces. Element  17  is male part of bristle part  11  for shaking prevention when assembled in female part  14  of  FIG. 1 . 
     Element  20  is the stopper for preventing dropping when attached to the head  7 . 
     In  FIG. 27 , Element  20  is the stopper for preventing dropping when the bristle part  11  is attached to the head  7  around the bottom of the board  10 . Elements  15 ,  16 ,  17  of both lateral fore-end are “&lt;” shaped male parts. Especially, Element  17  is the male part to prevent the fore-end of the bristle part from shaking laterally. Element  19  is rooted bristles. This is a lateral view of male parts  15 ,  16 ,  17  with the shaking prevention “&lt;” shape on the bristle part  11 . 
     In  FIG. 28 , Element  1  is a toothbrush, and Element  4  is a toothbrush body. This is lateral view of the fore-end of the toothbrush  1  which represents both bristle part  11  of  FIG. 27  and head  7  at the fore-end of the toothbrush body  4  for bristle part  11 . Element  19  is bristles. Element  20  is the stopper as described above. 
       FIG. 29  is a basal view of  FIG. 28 . Element  10  is a board, Element  1  is a toothbrush, and Element  4  is a toothbrush body. Element  20  is the aforementioned stopper, Element  19  is rooted brushes, and Element  14  represents female part  14  in board and male part  17  in toothbrush body  4  as a shaking prevention device when bristle part  11  is attached to toothbrush body  4 . 
       FIG. 30  is a A-A′ line cross-sectional view of  FIG. 28 . Element  1  is a toothbrush, and Element  4  is a toothbrush body. Element  10  is a board, Element  11  is a bristle part, Element  19  is bristles and Element  20  is a stopper. Elements  12 ,  14  are female parts which have “&lt;” shaped inside  21 ,  22  of the toothbrush body  4 . Element  14 ,  17  are male parts which have “&lt;” shaped lateral surfaces  23 ,  24  to bristle part  11 . 
     This implementation example is the toothbrush  1  as described above, the bottom of the bristle part  11  and the base of the toothbrush body  4  fit in the same plane, when the bristle part  11  is assembled to the head  7  of the toothbrush body  4 . 
     As described below, a sixth embodiment of the invention is shown in  FIGS. 31 to 36 . 
       FIG. 31  is a plane figure of toothbrush body  4  of toothbrush  1  which has installation head  7  at the fore-end part. Fore-end inner lateral surfaces  21 ,  22  of toothbrush body  4  are head  7  which is “&lt;” shaped to admit the bristle part  11  in  FIG. 3  which has “&lt;” shaped both right and left lateral male parts  15 ,  16 ,  17 . Both sides of head  7  and the bristle part  11  have female and male parts  14 ,  17  to prevent the fore-end of the toothbrush from shaking during brushing with the toothbrush  1 . 
       FIG. 32  is a plane figure of bristle part  11  with board  10  which is attached to the head  7 . Element  23 ,  24  are both left and right lateral surfaces. Element  17  is male part of bristle part  11  for preventing shaking when attached to female part  14  of  FIG. 1 . 
     Element  20  is the stopper for preventing dropping when assembled to the head  7 . 
     In  FIG. 33 , Element  20  is the stopper for preventing dropping when the bristle part  11  is attached to the head  7  around the bottom of the board  10 . Elements  15 ,  16 ,  17  of both lateral fore-ends are “&lt;” shaped male parts. Especially, Element  17  is the male part to prevent the fore-end of the bristle part from shaking laterally. Element  19  is rooted bristles. This is a lateral view of male parts  15 ,  16 ,  17  with the shaking prevention “&lt;” shape on the bristle part  11 . 
     In  FIG. 34 , Element  1  is a toothbrush, and Element  4  is a toothbrush body. This is lateral view of fore-end of the toothbrush  1  which represents both bristle part  11  of  FIG. 33  and head  7  at the fore-end of the toothbrush body  4  for bristle part  11 . Element  19  is bristles. Element  20  is the stopper as described above. 
       FIG. 35  is a basal view of  FIG. 34 . Element  10  is a board, Element  1  is a toothbrush, and Element  4  is a toothbrush body. Element  20  is the aforementioned stopper, Element  19  is rooted brushes, and Element  14  represents female part  14  in board and male part  17  in toothbrush body  4  as a shaking prevention device when bristle part  11  is attached to toothbrush body  4 . 
       FIG. 36  is a A-A′ line cross-sectional view of  FIG. 34 . Element  1  is a toothbrush, and Element  4  is a toothbrush body. Element  10  is a board, Element  11  is a bristle part, Element  19  is bristles and Element  20  is a stopper. Elements  12 ,  14  are female parts which have “&lt;” shaped inside  21 ,  22  of the toothbrush body  4 . Element  14 ,  17  are male parts which have “&lt;” shaped lateral surfaces  23 ,  24  to bristle part  11 . 
     This implementation example is the toothbrush  1  as described above, formed to be in the same level between the male part  14 ,  17  of the bristle part  11  and the base of the toothbrush body  4 , when the bristle part  11  is attached to the head  7  of the toothbrush body  4 . 
     As described below, a seventh embodiment of the invention is shown in  FIGS. 37 to 52 . 
       FIG. 37  is a flat plane figure of the toothbrush body  5  with the head  7  at the fore-end of the toothbrush  2 . Both right and left lateral male parts  15 ,  16 ,  17  at the inner lateral surfaces  21 ,  22  of the fore-end of the toothbrush body  5  are convex. 
       FIG. 38  is a basal view of  FIG. 37 .  FIG. 31  is a plane figure of toothbrush body  5  of toothbrush  2  which has installation head  7  at the fore-end part. Fore-end inner lateral surfaces  21 ,  22  of toothbrush body  4  are the head  7  which has curved male parts  15 ,  16 ,  17  at both right and left lateral surfaces. Both sides of head  7  and the bristle part  11  have female and male parts  14 ,  17  to prevent the fore-end of the toothbrush from shaking during brushing with the toothbrush  1 . 
       FIG. 39  is a plane figure of bristle part  11  in  FIG. 3 . Elements  23 ,  24  are both left and right lateral surfaces. Element  17  is a male part of bristle part  11  for preventing shaking when attached to female part  14  of  FIG. 1 . 
     Element  20  is the stopper for preventing dropping when attached to the head  7 . 
       FIG. 40  is a basal view of  FIG. 39 . Element  10  is a board, Element  11  is a bristle part. Element  20  is a detach preventing stopper when attached to the head  8  in  FIG. 37 . Element  19  is rooted bristles. Element  17  is male part  17  to prevent the fore-end of the toothbrush  2  from shaking laterally, when the bristle part is attached to the head  8  from the basal view direction of  FIG. 38 . 
       FIG. 41  is a lateral view of bristle part  11  which is attached to the head  8  of  FIG. 37 . The bristle part has a detach preventing stopper  20  at the base of the board  10 , curved male parts  15 ,  16 ,  17  at both lateral surfaces of enrooted bristle part  11 , and the step  18   a  at the upper portion of male part  16  not to protrude from the upper portion of toothbrush body  5 . 
       FIG. 42  is a C-C′ line cross-sectional view with  FIG. 41  assembled to  FIG. 37 . Element  10  is a board, and Element  11  is a bristle part. The bristle part is attached to head  8  for bristle part  11  which is at the fore-end of toothbrush body  5  of toothbrush  2 . Elements  12 ,  14  are female parts, Element  15 ,  17  are male parts, and Element  19  is bristles. The assembled stopper  20  base in the bristle part makes the same plane with the base of toothbrush. 
       FIG. 43  is a lateral view of bristle part  11  which is attached to the head  8  of  FIG. 37 . The bristle part has a detach preventing stopper  20  at the base of the board  10 , curved male parts  15 ,  16 ,  17  at both lateral surfaces of enrooted bristle part  11 , and the step  18   a  at the upper portion of male part  16  not to protrude from the upper portion of toothbrush body  5 . 
       FIG. 44  is a C-C′ line cross-sectional view with  FIG. 41  assembled to  FIG. 37 . Element  10  is a board, and Element  11  is a bristle part. The bristle part is attached to head  8  for bristle part  11  which is at the fore-end of toothbrush body  5  of toothbrush  2 . Elements  12 ,  14  are female parts, Elements  15 ,  17  are male parts, and Element  19  is bristles. The assembled stopper  20  base in bristle part  11  is designed to protrude from the base of the toothbrush body  5 . 
       FIG. 45  is a lateral view of bristle part  11  which is attached to the head  8  of  FIG. 37 . The bristle part has a detach preventing stopper  20  at the base of the board  10 , curved male parts  15 ,  16 ,  17  at both lateral surfaces of enrooted bristle part  11 , and the step  18   a  at the upper portion of male part  16  not to protrude from the upper portion of toothbrush body  5 . 
       FIG. 46  is a C-C′ line cross-sectional view with the  FIG. 45  attached to  FIG. 37 . Element  10  is a board, and Element  11  is a bristle part. The bristle part is attached to head  8  for bristle part  11  which is at the fore-end of toothbrush body  5  of toothbrush  2 . Elements  12 ,  14  are female parts, Elements  15 ,  17  are male parts, and Element  19  is bristles. The assembled stopper  20  base in bristle part is designed to protrude from the base of the toothbrush body  5 . 
     The shapes of the lateral surfaces of the head  8  and bristle part  11  from  FIG. 37  to  FIG. 46  are curved. 
       FIG. 47  is a lateral view of the bristle part  11  which is attached to the head  8  of the  FIG. 37 . The bristle part has a detach preventing stopper  20  at the base of the board  10 , “&lt;” shaped male parts  15 ,  16 ,  17  at both lateral surfaces of enrooted bristle part  11 , and the step  18   a  at the upper portion of male part  16  not to protrude from the upper portion of toothbrush body  5 . 
       FIG. 48  is a C-C′ line cross-sectional view with  FIG. 47  attached to  FIG. 37 . Element  10  is a board, and Element  11  is a bristle part. The bristle part is attached to head  8  for bristle part  11  which is at the fore-end of toothbrush body  5  of toothbrush  2 . Elements  12 ,  14  are female parts, and Elements  15 ,  17  are male parts. And they all are “&lt;” shape. Element  19  is rooted bristles. The assembled stopper  20  base in bristle part  11  protrudes from the base of the toothbrush body  5 . 
       FIG. 49  is a lateral view of the bristle part  11  which is attached to the head  8  of the  FIG. 37 . The bristle part has a detach preventing stopper  20  at the base of the board  10 , “&lt;” shaped male parts  15 ,  16 ,  17  at both lateral surfaces of enrooted bristle part  11 , and the  18   a  at the upper portion of male part  16  not to protrude from the upper portion of toothbrush body  5 . 
       FIG. 50  is a C-C′ line cross-sectional view with  FIG. 47  assembled to  FIG. 37 . Element  10  is a board, and Element  11  is a bristle part. The bristle part is attached to head  8  for bristle part  11  which is at the fore-end of toothbrush body  5  of toothbrush  2 . Elements  12 ,  14  are female parts, and Elements  15 ,  17  are male parts. And they all are “&lt;” shape. Element  19  is rooted bristles. The assembled stopper  20  base in bristle part  11  protrudes from the base of the toothbrush body  5 . 
       FIG. 51  is a lateral view of the bristle part  11  which is attached to the head  8  of the  FIG. 37 . The bristle part has a detach preventing stopper  20  at the base of the board  10 , “&lt;” shaped male parts  15 ,  16 ,  17  at both lateral surfaces of enrooted bristle part  11 , and the step  18   a  at the upper portion of male part  16  not to protrude from the upper portion of toothbrush body  5 . 
       FIG. 52  is a C-C′ line cross-sectional view with  FIG. 51  assembled to  FIG. 37 . Element  10  is a board, and Element  11  is a bristle part. The bristle part is attached to head  8  for bristle part  11  which is at the fore-end of toothbrush body  5  of toothbrush  2 . Elements  12 ,  14  are female parts, and Elements  15 ,  17  are male parts. And they all are “&lt;” shape. Element  19  is bristle enrooted. The assembled stopper  20  base in bristle part  11  protrudes from the base of the toothbrush body  5 . 
     The lateral surfaces of the head  8  and bristle part  11  from  FIGS. 48 to 52  are “&lt;” shaped. 
     As described below, an eighth embodiment of the invention is shown in  FIGS. 53 to 68 . 
       FIG. 53  is a toothbrush  3 , and Element  6  is a toothbrush body. It is the plane figure with the male part  16  at the head  9 , for the bristle part, in the fore-end of the brush body  6 . Elements  21 ,  22  are lateral surfaces of the head  9 . 
       FIG. 54  is a basal view of  FIG. 53  with  FIG. 57  attached. Element  10  is a board, Element  11  is a bristle part, Element  20  is a stopper, and Element  19  is rooted bristles. Elements  13  and  16  are female and male parts for preventing shaking of toothbrush  3 . 
       FIG. 55  is a plane figure of bristle part  11 . Elements  23 ,  24  are curved lateral surfaces, Element  10  is a board, Element  20  is a stopper and Element  13  is a female part. 
       FIG. 56  is a basal view of  FIG. 55 . Element  13  is a shake-preventing female part, Element  10  is a board, Element  11  is a bristle part, Element  20  is a stopper, and Element  19  is rooted bristles. 
       FIG. 57  is a lateral view of bristle part  11  which is attached to the head  9  in  FIG. 53 . Element  10  is a board, Element  11  is a bristle part, Elements  15 ,  16 , are curved male parts, and Element  20  is a detach preventing stopper. Element  19  is rooted bristles. 
       FIG. 58  is a D-D′ line cross-sectional view with bristle part  11  of  FIG. 57  attached to the head  9  of  FIG. 53 . Element  3  is a toothbrush, Element  6  is a toothbrush body, Element  10  is a board, Element  11  is a bristle part, Element  20  is a stopper, Element  19  is bristles, and Elements  12 ,  15  and  13 ,  16  are curved female and male parts. 
       FIG. 59  is a lateral view of bristle part  11  which is attached to the head  9  in  FIG. 53 . Element  10  is a board, Element  11  is a bristle part, Elements  15 ,  16 , are curved male parts, and Element  20  is a detach preventing stopper. Element  19  is rooted bristles. 
       FIG. 60  is a D-D′ line cross-sectional view with bristle part  11  of  FIG. 59  attached to the head  9  of  FIG. 53 . Element  3  is a toothbrush, Element  6  is a toothbrush body, Element  10  is a board, Element  11  is a bristle part, Element  20  is a stopper, Element  19  is bristles, and Elements  12 ,  15  and  13 ,  16  are curved female and male parts. 
       FIG. 61  is a lateral view of bristle part  11  which is attached to the head  9  in  FIG. 53 . Element  10  is a board, Element  11  is a bristle part, Elements  15 ,  16 , are curved male parts, and Element  20  is a detach preventing stopper. Element  19  is rooted bristles. 
       FIG. 62  is a D-D′ line cross-sectional view with bristle part  11  of  FIG. 61  attached to the head  9  of  FIG. 53 . Element  3  is a toothbrush, Element  6  is a toothbrush body, Element  10  is a board, Element  11  is a bristle part, Element  20  is a stopper, Element  19  is bristles, and Elements  12 ,  15  and  13 ,  16  are curved female and male parts. 
       FIG. 63  is a lateral view of bristle part  11  which is attached to the head  9  in  FIG. 53 . There is a detach preventing stopper  13  when attached to the head  9 , and “&lt;” shaped male parts  15 ,  16  on both lateral surfaces at the base of board  10 . Element  19  is bristles. 
       FIG. 64  is a D-D′ line cross-sectional view with bristle part  11  of  FIG. 57  attached to the head  9  of the  FIG. 53 . Element  6  is a toothbrush body of toothbrush  3 , Element  10  is a board, and Element  11  is a bristle part. The female parts  12 ,  13  of the inner lateral surfaces of toothbrush boy  6  are concave, and the male parts  15 ,  16  of the lateral surfaces of the fore-end of the bristle part  11  have the shape of a curve. Element  20  is a detach preventing stopper where the bristle part  11  is attached to the head  9  as described above. Element  19  is bristles. 
       FIG. 65  is a lateral view of bristle part  11  which is attached to the head  9  in  FIG. 53 . There is a detach preventing stopper  13  when attached to the head  9 , and “&lt;” shaped male parts  15 ,  16  on both lateral surfaces at the base of board  10 . Element  19  is bristles. 
       FIG. 66  is a D-D′ line cross-sectional view with bristle part  11  of  FIG. 57  attached to the head  9  of the  FIG. 53 . Element  6  is a toothbrush body of toothbrush  3 , Element  10  is a board, and Element  11  is a bristle part. The female parts  12 ,  13  of the inner lateral surfaces of toothbrush boy  6  are concave, and the male parts  15 ,  16  of the lateral surfaces of the fore-end of the bristle part  11  have the shape of a curve. Element  20  is a detach preventing stopper where the bristle part  11  is attached to the head  9  as described above. Element  19  is bristles. 
       FIG. 67  is a lateral view of bristle part  11  which is attached to the head  9  in  FIG. 53 . There is a detach preventing stopper  13  when attached to the head  9 , and “&lt;” shaped male parts  15 ,  16  on both lateral surfaces at the base of board  10 . Element  19  is bristles. 
       FIG. 68  is a D-D′ line cross-sectional view with bristle part  11  of  FIG. 57  attached to the head  9  of the  FIG. 53 . Element  6  is a toothbrush body of toothbrush  3 , Element  10  is a board, and Element  11  is a bristle part. The female parts  12 ,  13  of the inner lateral surfaces of toothbrush boy  6  are concave, and the male parts  15 ,  16  of the lateral surfaces of the fore-end of the bristle part  11  have the shape of a curve. Element  20  is a detach preventing stopper where the bristle part  11  is attached to the head  9  as described above. Element  19  is bristles. 
     In  FIG. 53  to  FIG. 62 , inner surfaces of head  9  and fore-end lateral surfaces of bristle part  11  are curved, and in  FIGS. 63 to 68 , they are “&lt;” shaped. 
       FIG. 69  is a B-B′ line cross-sectional view of  FIGS. 4 ,  16 ,  22 , and  36 . Element  10  is a board, Element  11  is a bristle part, Elements  21 ,  22  are lateral surfaces of head, and Element  7 ,  8 ,  9  are installation heads. 
     As both the inner lateral surfaces of the head  32  for the bristle part  33  prepared at the fore-end of the toothbrush body  31  of the conventional toothbrush  30  and the fore-end lateral surfaces of the bristle part  33  are curved or “&lt;” shaped in  FIG. 70 , when the toothbrush  30  in  FIG. 70  is used as described above, the fore-end head portion at the toothbrush body for bristle part  33  shakes laterally. 
     REFERENCE NUMERALS 
     
         
         
           
               1 ,  2 ,  3 ,  30 : toothbrush 
               4 ,  5 ,  6 ,  31 : toothbrush body 
               7 ,  8 ,  9 ,  32 : head 
               10 : board 
               11 ,  33 : bristle part 
               12 ,  13 ,  14 ,  34 : female part 
               15 ,  16 ,  17 ,  35 : male part 
               18 ,  18   a : step 
               19 : bristles 
               20 : stopper 
               21 ,  22 ,  23 ,  24 : lateral surface 
               36 : points 
             A-A′, B-B′: direction