Brush With Universal Joints

The present invention relates to toothbrushes in which the brush head is adjustable relative to the handle so that the hard-to-get-at areas of the teeth, the "dead corners", can be easily cleaned. The conventional brush and its handle are made in one piece. Usually it is very difficult to clean certain of these "dead areas" due to the limited working space. The toothbrush of the present invention is divided into four pieces. The first piece is the handle, the second piece is the neck and about 3/4ths of the rear portion of the brush head, the third and fourth pieces are the two detachable and pivotable side-by-side pieces that occupy about 1/4 of the front part of the brush head. The handle and neck pieces are pivotally jointed to each other by the various universal joints of the present invention.

The conventional tooth brush can hardly clean the most inner teeth in the mouth. However, if the present invention, a tooth brush with the head bent, is applied, any tooth (including the most inner ones) in the mouth can be easily cleaned.

Besides the bending of the head of the brush, it can also be bent at the neck. Thus more brush efficiency can be obtained.

The object of the present invention is to be able to clean the "Dead corner" by the bent head of the brush when the working space is limited.

The other object of the present invention is to be able to clean other small "Dead corner" by the turnable front part of the brush.

FIG. 1 is a side elevation of the present invention showing the parts in an exploded view,

FIG. 2 is a partial view thereof showing the brushing area having the turning pieces connected to said brushing area,

FIG. 3 is a top view of the brushing area,

FIG. 4 is a cross-sectional view taken along line A--A of FIG. 3,

FIG. 5 is a view similar to FIG. 4 but with the turning pieces turned outwardly,

FIG. 6 is a side view of the present invention partly in section,

FIG. 7 is a side view thereof showing the neck in different positions,

FIG. 8 is a sectional view of a second alternate joint at the neck portion in the form of a polyhedron ball joint,

FIG. 9 is a sectional view of the polyhedron ball joint unassembled,

FIG. 10 shows a sectional view of a third alternate of the neck joint with a round sleeve,

FIG. 11 is a partial perspective view of a fourth alternate joint showing a flat sleeve,

FIG. 12 is a cross-section of the flat sleeve in FIG. 11,

FIG. 13 is a partial sectional view of a fifth alternate neck joint unassembled showing a drum joint,

FIG. 14 is a partial sectional view of FIG. 13 in the assembled condition,

FIG. 15 is a perspective view of the turnable drum and turning axle of FIGS. 13 and 14,

FIG. 16 is a partial sectional view of the joint unassembled showing a third modification,

FIG. 17 is a perspective view in partial and drum wheel socket of FIG. 16,

FIG. 18 is a partial view of the neck joint in section showing the assembled fixed drum joint,

FIG. 19 is a front view of the brush area showing the curved and surface of the brush hairs or bristles, and

FIG. 20 is a perspective view of the present invention.

The present invention can be applied to various kinds of brushes, but the tooth brush is now taken as an example. The detailed description is given below.

The present invention is divided into three sections: (1) the handle 10, (2) the neck and the rear major part (about 3/4) of the brushing area 3, (3) the two turning pieces 1 (the front minor part of the brushing area 3 (about 1/4 )). Therefore the present invention is again divided into four independent pieces (see FIG. 1).

The two turning pieces 1 are equal in size, and each of them has a plain ball joint 2. In the front of the brush body 5 there are two plain ball sockets 4 side by side (see FIG. 1). They are prepared for receiving the two plain ball 2. After joining together, the two turning pieces 1 can be turned inward or outward (see FIG. 5). The two turning pieces 1 can be concurrently bent downward (see FIG. 2) to increase the brushing strength. The cuts 13, 14 are prepared (see FIGS. 3-6) to make the bending easy.

At rear part of the neck 6 five alternative joints can be set to make the brush body 5 can be either bending or turning or the tooth combined (see FIG. 7) to meet the different requirements in operation.

The five alternative joints are described one after the other as follows.

FIGS. 1 and 6 are referred.

A ratchet ball 7 is fixed at the right end of the neck 6, and a correspondent ratchet ball socket 11 is prepared inside the left end of the handle 10. On the surface of the ratchet ball 7 there are net-like protruded round prisms, and on the surface of the ratchet ball socket 11 there are net-like troughs. These prisms and troughs are matched each other. Therefore when the ratchet ball 7 is inset by force into the ratchet ball socket 11, then the joint is well joined and can be turned to any direction. When turning, the two nets are moved relatively and some sound can be heard.

A special sleeve 9 is set around the joint to increase the strength of the joint (see FIG. 1). Inside the sleeve 9 there is a sleeve inner rim 9.sub.a and at the left end of the handle 10 there is a circular trough 12 is also prepared, thus when the sleeve inner rim 9.sub.a is moved into the circular trough 12 then the sleeve 9 is set at its proper position. On both sides of the sleeve 9 there are deformed plates 9.sub.b. They can prevent from slipping when the fingers are pressed on them.

The FIGS. 8 and 9 are referred.

The polyhedron ball joint is approximately same as the ratchet ball joint as described above except the contact surfaces. A polyhedron ball 15 is fixed at the right end of the neck 6 and a correspondent polyhedron ball socket 17 is prepared at the left end of the handle 10. The plastic prisms 16 on the polyhedron ball 15 is tough to some suitable extent. The troughs 18 on the surface of the polyhedron ball socket 17 are designed to match the plastic prisms 16. Therefore when the polyhedron ball 15 is inset by force into the polyhedron ball socket 17, then the joint is well joined and can be turned to any direction. When turning the plastic prisms 16 and the throughs 18 are moved relatively and some sound can also be heard.

Same as the ratchet ball joint a special sleeve 9 is prepared (see FIGS. 6, 8, and 9) for increasing the strength at the joint.

FIG. 10 is referred.

The circular tough rod 21 commonly used at the desk lamp can be applied here. Therefore the brush body 5 can be turned universally.

However same as the ratchet ball joint a circular tough rod sleeve 19 is prepared. On the outer surface of the circular tough rod sleeve 19 the wavy troughs 19.sub.a are prepared for the purpose of the prevention from slipping of the fingers when the fingers are pressed on them.

At the right end of the circular tough rod sleeve 19 there is a two-round male thread 20 on its inner face, meanwhile there is a set of female thread 22 on the outer surface of the circular tough rod 21. The two set male thread 20 and female thread 22 can match each other. Thus the circular tough rod sleeve 19 can be moved along the circular tough rod 21 when the sleeve 19 is turned by hand round the female thread 22. Then the strength of the circular tough rod 21 can be increased and adjusted. The jointing heads 23 at the both ends of the circular tough rod 21 can be inset into the handle 10 and the neck 6 by common method.

FIGS. 11 and 12 are referred.

The flat tough rod joint is similar to the circular tough rod joint as described before except the forms in their cross sections. The cross section of the flat tough rod joint is flat (see FIG. 12). The flat tough rod may not be strong enough, then a flat tough rod sleeve 24 is applied. On both sides of the flat tough rod sleeve 24 there are also the wavy troughs 24.sub.a for the purpose of preventing from slip of the fingers.

FIGS. 13-18 are referred.

The drum wheel joint is approximately same as the ratchet ball joint and the polyhedron ball joint except the ball. A drum wheel 27, 30 is used instead of the balls in the former two joints. On the circumferential surface of the drum wheel 27, 30 there are parallel round prisms 27.sub.a, 30.sub.a all round the drum wheel 27, 30. At the left end of the handle 10 there is a drum wheel socket 28, 32, which can receive the drum wheel 27, 30. On the circumferential surface of the drum wheel socket 28, 32 there are also parallel troughs 28.sub.a, 32.sub.a which can couple with the parallel round prisms 27.sub.a, 30.sub.a. Thus the drum wheel joint can then be joined firmly. If the handle 10 is turned by force, them the tooth brush can be bent at the joint, and the sound is made when the parallel round prisms 27.sub.a, 30.sub.a is turned and moved relatively to the parallel troughs 28.sub.a, 32.sub.a.

The drum wheel joint may not be strong enough, then a sleeve 9 is applied same as in the ratchet ball joint (see FIGS. 14 and 18).

The drum wheel 27, 30 is inset into the neck 6 in two different ways. They are described as follows.

(i) Turntable type:

FIGS. 13, 14, and 15 are referred.

At the back of the drum wheel 27 there is a turning axile 26 with a set of parallel turning axile protruded circles 26.sub.a on it. At the right end of the neck 6 with a turning axile socket 29 there is a set of parallel troughs 29.sub.a inside it. The axile 26 and the protruded circles 26.sub.a are correspondent to the turning axile socket 29 and the troughs 29.sub.a, so that they can coupled firmly when the turning axile 26 is inset into socket 29 by force. Therefore this joint can be bent upward and downward and turned to any direction.

(ii) Fixed type:

FIGS. 16, 17 and 18 are referred.

The drum 30 and the neck 6 are made in one piece. A drum wheel block 31 is prepared which is a shell in form. At the left end of the handle 10 there is a drum wheel block socket 31.sub.a which can receive the drum wheel block 31. The drum wheel block 31 is allowed to turn in the drum wheel block socket 31.sub.a. Inside the drum wheel block 31 there is again a drum wheel socket 32 which can receive the drum wheel 30. When the three pieces, the drum wheel 30, the drum wheel block 31, and the handle 6 with the drum wheel socket 31.sub.a, are assembled well (see FIG. 18), this joint will then be coupled firmly. Thus this joint can be bent and turned to any direction.

The five different joints can also be used to join the turning pieces 1 to the main brush body to substitute the plain balls 2 and the plain ball sockets 4.

FIG. 19 is the front view of the tooth brush in which the wavy curve along the master arc of the surface of the hairs is shown. This technical "planting hair" can achieve some special functions of brushing and cleaning.

FIG. 20 is the perspective view of the present invention where shows the beauty in form and the practice in use.

A music I.C. plate 25 can be attached to one side of the handle 10 (see FIG. 20). The music will begin when the user's hand grips the handle 10, and the music will stop as the hand off. Therefore the user may acquire some relaxation during brushing and the children may get more interesting while brushing their teeth.

All the foregoing described joints can be applied to any other brushes with or without handles (only the joint at about the front 1/4 of the brush body being applied).