Patent Publication Number: US-4221492-A

Title: Toothbrush with built-in &#34;squeezable&#34; valved toothpaste holder

Description:
We all know the normal cleaning method whereby fluids are spread onto more or less stiffened bristles fixed onto a base, such as brushes, paint brushes and the like. The products generally used with such brushes are kept in suitable tins and are applied to the brush, or to the treated surface, by pouring, dipping or some other method. 
     A number of systems have been invented to facilitate direct application of the product onto the bristles. In some of those most frequently used, the handles themselves contain the product and connection between the handles and the brush part takes place through internal channels. All the methods used have given rise to various difficulties. For example, where there is a continuous flow between the handle-container and an outlet placed near the bristles: 
     if liquid products are used, either too little or too much comes out, 
     if pastes are used and plastic containers, some of the paste is left inside or squeezes out through the joints with the filling cap or with the brush, or else there is unhygienic waste of the product through the outlet near the bristles. 
     The present invention eliminates these troubles as will be explained below. 
     A plastic device is envisaged formed of three main parts: 
     A brush section with an internal channel running along its length connected to an aperture which opens onto the surface where the bristles are fitted; 
     A central section with a filling inlet at the bottom end; 
     A cap which closes the filling inlet. 
     The central section includes zones which vary in rigidity and flexibility, 
     according to the longitudinal directions 
     in the aperture connecting it to the brush section and 
     in the open filling aperture within a rigid plastic disk. 
     The disk and the central section are cast in one piece. In the part between the container and the paste outlet, and also at the other end of the container, automatic vales are placed. Their arrangement and type are such that when pressure is exercised inside the container, the first valve opens while the second one either closes or stays closed. When a depression is created the first valve closes or stays closed, and the second one opens. 
     The attached diagrams show some examples of how the device works. 
    
    
     FIG. 1 is a view of the toothbrush. 
     FIG. 2 is a view of the cap with valve. 
     FIGS. 3-8 are alternate types of distribution valve means. 
     FIGS. 9 and 10 are variations of the central section and filling aperture respectively. 
     FIGS. 11 and 11&#39; are views of a toothbrush case. 
     FIGS. 12 and 13 are views of the brush means being squeezed. 
    
    
     The toothbrush (10) with its bristles (11) consists of a brush section (12), a central section (13) and a cap (14). The channel (15) connects the threaded base (16) to the distribution aperture (17). The central section comprises the threaded collar (18) and the end filling aperture (19) with internal thread cut in a disk (20). This latter is welded onto the central section. 
     The external (21) and internal (22) surfaces of the central section are out of line on the XX axis so that wall thickness decreases little by little from the back (23) towards the front end (24). 
     The distribution valve is shown both by itself (25) FIG. 3 and mounted (26). 
     The wedge (27) in FIG. 4 fitted into the semicircular channel (15) holds the part marked (28) of the leg of valve (29) against the wall. The head (30) fits into the conical niche (31) of the wedge itself, the truncated cone-shaped back of which is lodged in the channel (15). The part of the valve leg marked (32) acts as a traction spring. The back hole (19) cut into the disk (20) is closed with a cap (14) provided with a threaded leg (34). This leg has an axial hole with a truncated cone-shaped aperture (35) served by an outlet valve (36) FIG. 5, kept closed by a helical tapered spring (38) lying between the tongues (39) and the bottom of the valve itself. 
     The mode of operation is quite clear. 
     The toothpaste, or other suitable product, is put in through the hole (19). The central section during use acts as a handle transmitting the force applied by the hand to the toothbrush onto the teeth. By applying pressure to the flexible front surface, internal pressure is set up which pushes the product, e.g. toothpaste, along the channel of the brush section as far as the distribution valve. This latter, pressed by the paste, overcomes the resistance offered by the flexible leg and opens, allowing the paste to pass among the bristles (11). 
     Left to itself, the central section (13) resumes its original shape, sucking in an equivalent amount of air, through the valve (36), compared to the product expelled with any air there may have been. The cycle having been completed, both valves close. 
     FIG. 6 shows another type of distribution valve consisting of a half-sphere (40) served by a traction spring (41). 
     FIG. 7 shows a sliding piston valve (42) in the extension (43) of the channel (44). 
     FIG. 8 illustrates another valve formed by the small ball (45) served by the spring (46) which closes the aperture (47) of the container (48). 
     In FIG. 9, the diametral ribbing (49) providing another type of rigidity for the central section, can be seen. 
     FIG. 10 shows a variation of the filling aperture with a threaded cap 63, consisting of the triangular fins (50) on the lens (51) which fit into the threading on the collars of ordinary toothpaste tubes, to facilitate introduction of the paste. 
     FIG. 10 also shows a method of joining the disk (52) to the central section (53) by injection molding a plastic collar (55) on the joint (54) thus establishing real structural and molecular continuity. 
     FIGS. 12 and 13, respectively show how the central section can be completely squeezed, as would be done with an ordinary tube of toothpaste, both near the filling aperture (56) and also near the threaded joint of connection (57) with the brush section without any risk of the different sections coming apart. 
     FIGS. 11 and 11&#39; shows the cylindrical brush casing (58) divided more or less mid-way along into two halves (59) and (60). Stability of the brush inside it is ensured by a recess (64) which fills the space between the case and the back (61) of the brush section. On the bottom end of the casing there is a mirror (62). 
     The main advantages of the invention are clearly as follows: 
     complete utilization of all the paste contained inside; 
     maximum cleaning action, partly due to rigidity of the middle section; 
     maximum steady paste flow, due to the two valves, one for distribution and the other for air outlet; 
     very high hygienic level as both valves automatically close after use; 
     convenient to use especially when traveling due to the rationally designed cylindrical case with mirror at one end. 
     As the invention concerned can be applied to other articles and as the description of its application to a toothbrush does not in any way limit a wider application, a request for industrial exclusivity for the concept involved must include every similar application actuated and/or operating in accordance with one or more of the characteristics described in the following