Cartridge-loaded pressure feed toothbrushes

Claim 1

A CARTRIDGE-LOADED PRESSURE OPERATED TOOTHBRUSH COMPRISING A TUBULAR HANDLE HAVING FORWARD AND REAR ENDS, A BRUSH HEAD ON THE FORWARD END OF THE HANDLE AND HAVING AN AXIAL REARWARDLY TAPERED NIPPLE ON ITS REAR END, SAID BRUSH HEAD HAVING A LONGITUDINAL BORE EXTENDING THERETHROUGH, MEANS CLOSING THE FORWARD END OF THE BORE, BRISTLE MEANS ON A SIDE OF THE BRUSH HEAD, MEANS PROVIDING FOR DISCHARGE OF TOOTHPASTE FROM SAID BORE TO THE BRISTLE MEANS, AND ENDWISE COLLAPSIBLE TOOTHPASTE CONTAINING CARTRIDGE POSITIONED WITHIN THE HANDLE BEHIND THE BRUSH HEAD, SAID CARTIRIDGE HAVING A CLOSED REAR END, A RIGID FORWARD END WALL CLOSING THE FORWARD END OF THE CARTRIDGE, SAID FORWARD END WALL BEING FORMED WITH AN AXIAL TAPERED SOCKET, A RELATIVELY THIN FRANGIBLE REAR END WALL CLOSING THE REAR END OF THE SOCKET, SAID BRUSH HEAD BEING THREADED ON THE HANDLE AND ADAPTED TO BE THREADED REARWARDLY ON THE HANDLE TO PUSH THE BRUSH HEAD NIPPLE INTO THE CARTRIDGE SOCKET AND BREAKAN OPENING IN THE FRANGIBLE REAR WALL OF THE SOCKET SO AS TO PROVIDE COMMUNICATION BETWEEN THE INTERIOR OF THE CARDTIDGE AND THE BRUSH HEAD BORE, AND FORWARD PRESSURE EXERTING MEANS COMPRISING A MEMBER WORKING ENDWISE IN THE HANDLE AT THE REAR END THEREOF AND ENGAGED WITH THE REAR END OF THE CARTRIDGE FOR COLLAPSING THE CARTRIDGE FORWARDLY AND DISCHARGING TOOTHPASET THEREFROM TO THE BRUSH HEAD BORE AS THE BRUSH HEAD IS THREADED REARWARDLY ON THE HANDLE SAID PRESSURE EXERTING MEANS COMPRISING A PISTON ASSEMBLY SLIDING IN THE BORE OF THE HANDLE BEHIND THE CARTRIDGE, SAID PISTON ASSEMBLY COMPRISING A PISTON ENGAGED WITH THE REAR END OF THE CARTRIDGE AND SLIDING IN THE HANDLE BORE, OPPOSED GUIDE GROOVES IN THE HANDLEBORE, GUIDE LUGS ON THE PISTON SLIDING IN THE GROOVES, A REDUCED DIAMETER PISTON ROD FIXED TO THE PISTON AND EXTENDING REARWARDLY THEREFROM, AN EXTERNALLY THREADED HEAD FIXED ON THE REAR END OF THE PISTON AND CONCENTRICALLY SPACED FROM THE SIDE WALL OF THE HANDLE, AN INTERNALLY THREADED TUBE PASSING THROUGH THE REAR OF THE HANDLE INTO THE SPACE BETWEEN THE HANDLE SIDEWALL AND THE THREADED HEAD AND THREADED ON THE THREADED HEAD, AN END WALL CLOSING THE REAR END OF THE TUBE AND ABUTTING THE REAR END OF THE HANDLE, SAID TUBE END WALL HAVING A FORWARDLY EXTENDING ANNULAR FLANGE TURNING ON THE EXTERIOR SURFACE OF THE HANDLE, SAID FLANGE HAVING AN INTERNAL ANNULAR RIB, AND THE HANDLE HAVING AN EXTERNAL ANNULAR GROOVE IN WHICH SAID RIB IS CONFINED.