in fig1 reservoir 10 includes outer hollow cylinder or body 11 with end cap 12 closing off one end thereof . body 11 carries longitudinal ribs 13 on its outer wall . end opening 14 is provided through end cap 12 to permit air to flow in and out of the space within body 11 immediately adjacent to end cap 12 . end cap 12 also has an indentation 16 therein for receiving and supporting one end of threaded rod or worm 18 . as is shown in fig1 rod 18 may be conical in shape at its end which cooperates with indentation 16 so as to effect support of rod 18 at that end . the opposite end of threaded rod or worm 18 terminates in aperture plate 20 which has a plurality of channels 22 about the periphery thereof , as can be seen more thoroughly in fig3 to permit the passage of toothpaste into and out of reservoir space 24 . aperture plate 20 is secured , as by sonic welding , to spout portion 26 . rod 18 is threaded , as shown in fig1 the threads 28 extending the length of rod 18 to form the equivalent of a worm . the piston 30 has a peripheral shape or contour and is dimensioned so as to cooperate with the shape of the inner walls of body 11 . this relationship can be seen more clearly in fig2 . piston 30 fits slidably within the inner walls of body 11 . piston 30 has a centrally threaded opening 32 , the threads of which are designed to cooperate with the threads appearing on rod 18 . because of peripheral contour of piston 30 is other than circular , for example hexagonal as shown in fig2 rotation of body 11 will cause rotation of piston 30 and , since threaded rod 18 is fixed in position within body 11 and body 11 is rotatably affixed to spout portion 26 by ring 34 , such rotation of body 11 will result in linear displacement of piston 30 within the inner space 24 of body 11 causing the volume of that space to be changed . as piston 30 moves toward aperture plate 20 , any toothpaste within space 24 will be forced outwardly through channels 22 in aperture plate 20 and into channel 36 within spout portion 26 . contrary - wise , if the body 11 is rotated in the opposite direction , piston 30 will retreat towards end cap 12 increasing the volume of space 24 within body 11 so that toothpaste may be loaded into that space . o - ring 38 is provided to assure a liquid seal to prevent toothpaste from escaping other than through channels 22 in aperture plate 20 . spout portion 26 terminates at its outer end , that is , the end opposite to that connected to aperture plate 20 , in a connector portion 40 . connector 40 has a large - diameter portion 42 and a smaller diameter portion 44 , portion 44 being tapered , if desired , to simplify its insertion into a toothpaste tube opening . both portions 42 and 44 carry male threads . brush head portion 46 includes a connector section 48 having internal or female threads 50 dimensioned to cooperate with the male threads on larger diameter portion 42 of connector 40 . in addition , brush head 46 has a channel 52 extending therethrough and terminating in bristle portion 54 , as shown . with brush head 46 in position on spout 26 , channels 52 and 36 are aligned . to fill the variable volume of space 24 in body 11 , brush head 46 is removed from spout portion 26 by relative rotation between brush head 46 and body 11 , smaller diameter portion 44 of connector 40 on spout 26 may be inserted within the opening 56 of the uncapped nozzle 58 on toothpaste tube 60 , as shown in fig4 . the threads on portion 44 keep the tube 60 and the connector 40 in engagement as tube 60 is squeezed . at the onset of the filling process , body 11 has been rotated relative to spout portion 26 so that piston 30 has been retracted to a position proximate to end cap 12 . space 24 within body 11 is then of maximum volume . as tube 60 is squeezed , toothpaste 62 flows out of tube 60 through channel 36 in spout portion 26 , through apertures or channels 22 in aperture plate 20 and into the space 24 formed within the body 11 by the retraction of piston 30 . once chamber or space 24 has been filled with toothpaste , tube 60 is removed from portion 44 by rotation with respect to spout portion 26 in a direction opposite to that used to engage portion 44 in the inner opening 56 in toothpaste tube nozzle 58 . brush head 46 may then be attached to reservoir 10 by inserting connector portion 42 in the corresponding receiving portion of brush head 46 . relative rotation of brush head 46 and body 11 will cause a firm engagement of brush head 46 with connector portion 42 on spout 26 . to use the brush with the brush head so installed , brush head or spout portion 26 may be held with one hand and body 11 turned , for example clockwise , with the other hand to cause piston 30 to move away from end cap 12 towards aperture plate 20 , thus forcing paste out of chamber 24 through apertures or channels 22 into channels 36 , 52 and ultimately to bristle portion 54 of brush head 46 . by this technique , the proper amount of toothpaste may be dispensed to the bristle portion 54 for optimum brush performance . reservoir 10 may be used in connection with multiple , selected brush heads 46 . for example , each member of a family may have his separate brush head 46 to be selectively attached to a common reservoir 10 . while a particular embodiment of my invention has been shown and described , it will be evident to those skilled in the art that variations and modifications of that embodiment may be made without departing from the scope of my invention . it is the purpose of the appended claims to cover all those variations and modifications .
by providing a reservoir of variable volume with an integral filling and dispersing spout having a portion with an outer diameter such that the spout will form an interference fit within the dispersing spout of any toothpaste tube and having another portion dimensioned to be coupled to a disposable brush portion having a paste channel therethrough to the bristles a convenient and versatile paste - dispensing toothbrush is realized .