A TOOTHBRUSH

Abstract: A toothbrush split axially into two halves (1) which are hinged together along their length. The toothbrush can be used in a first position as a conventional toothbrush and can be pivoted to a second position wherein the bristles (4) on the heads (3) extend towards one another.

Description: A TOOTHBRUSH Λ The present invention relates to a toothbrush of the kind having a pair of heads capable of cleaning two sides \ 5 of a tooth simultaneously. Toothbrushes are known which have two fixed heads which face one another and from which bristles extend towards those of the other head. These toothbrushes have two disadvantages. Firstly, they have a fixed gap between 10 the bristles so that different thicknesses of teeth can not be uniformly cleaned. Secondly, the twin heads make the end of the toothbrush far more bulky than a conventional toothbrush and thus it is difficult to clean one side of a tooth alone. 15 According to the present invention, a toothbrush comprises two halves, each consisting of an elongate handle with, at one end a head carrying bristles, the two halves being hinged together about an axis extending substantially parallel to the lengths of the handles; whereby the two 20 halves can be pivoted between a first position in which the heads lie closely side by side with the bristles extending in substantially the same direction, and a second position in which the heads are spaced apart with the bristles of each head extending towards those of the other head. 25 With this arrangement, the toothbrush can be used in a first position as a conventional toothbrush and in a second position in which the brush can be used to clean two sides of the tooth simultaneously. The two halves are preferably hinged together using a 30 film hinge. The two halves of the toothbrush may be held in the " f first position by a sheath removably fitted over the a handles. Preferably, the end of each half remote from the ϋ. head is provided with a respective peg positioned such that 35 the spacing between the pegs is the same in the first and second positions; whereby the toothbrush can be held in the first and second positions by a retainer having two sockets which are complimentary to the pegs in the first and second positions. This prevents the toothbrush from accidentally rotating into the second position during use. An example of a toothbrush constructed in accordance with the present invention will now be described with reference to the accompanying drawings, in which: Figure l is a plan view of the toothbrush and retainer in the first position with the retainer detached; Figure IA and IB are end views of the toothbrush and retainer respectively with the toothbrush in the first position; Figure 2 is an enlarged section along line A-A in Figure 1; Figure 3 is a plan view of the toothbrush and retainer in the second position with the retainer detached; Figures 3 and 3B are end views of the toothbrush and retainer respectively with the toothbrush in the second position; Figures 4 and 5 show the toothbrush in use in the first position; and, Figures 6 and 7 show the toothbrush in use in the second position. The toothbrush shown in Figures 1 to 3 comprises two symmetrical halves 1 each having a handle 2 with a head 3 at one end. Bristles 4 extend perpendicularly from the heads 3. The two halves l are joined by a film hinge 5 attached to the top surface and along the length of the handle as shown in Figures 1 and 2. In the first position, the heads 3 of the two halves 1 lie side by side, with the bristles 4 of both halves being parallel. The toothbrush may be used in this position as shown in Figures 4 and 5 as a conventional toothbrush. If it is desired to simultaneously clean two surfaces of a tooth, the toothbrush can be easily manipulated into the second position. The two halves 1 of the toothbrush are rotated about the flap hinge into the position shown in Figure 3. The heads 3 face each other and the bristles 4 extend into the gap between the heads. It can be used to brush teeth in the manner shown in Figures 6 and 7. The end of each half 1 is provided with a peg 6. The positioning of the pegs 6 is such that in the first and second position, the distance between the pegs is the same. A retainer 7 is provided with two sockets which are complimentary to the pegs and can be fitted over the pegs in the first and second positions. The retainer 7 is press fitted onto the pegs 6 in order to hold the toothbrush in one position. It has to be removed before moving the toothbrush to the other position whereupon it can be replaced to hold the toothbrush in the second position.

Claims: CLAIMS 1. A toothbrush comprising two halves (1) , each consisting of an elongate handle (2) with, at one end a head (3) carrying bristles (4) , the two halves being hinged together about an axis extending substantially parallel to the lengths of the handles; whereby the two halves can be pivoted between a first position in which the heads lie closely side by side with the bristles extending in substantially the same direction, and a second position in which the heads are spaced apart with the bristles of each head extending towards those of the other head. 2. A toothbrush according to claim 1, wherein the two halves are hinged together using a film hinge (5) . 3. A toothbrush according to claim 1 or claim 2 , wherein the end of each half remote from the head is provided with a respective peg (6) positioned such that the spacing between the pegs is the same in the first and second positions; whereby the toothbrush can be held in the first and second positions by a retainer (7) having two sockets which are complimentary to the pegs in the first and second positions.

Inventors: CHUNG ANGELIKA YUK BING, CHUNG, ANGELIKA, YUK, BING
Applicants: CHUNG ANGELIKA YUK BING, CHUNG, ANGELIKA, YUK, BING
Application year: 1992
Main classification: A46B5
IPC codes: A46B5, A46B9