Paste dispensing toothbrush

• US 4,277,194 A
• Filed: 09/20/1979
• Issued: 07/07/1981
• Est. Priority Date: 09/20/1979
• Status: Expired due to Term

• Current Assignee: Donald R. Smith
• Original Assignee: Donald R. Smith
• Inventors: Smith, Donald R.
• Primary Examiner(s): Coughenour, Clyde I.
• Application Number:
  US06/077,342
• Time in Patent Office: 656 Days
• Field of Search: 401/173, 401/174, 401/177, 401/179, 401/182, 222/326, 222/386, 222/390
• US Class Current: 401/173
• CPC Class Codes: A46B 11/0027 Lead-screw mechanisms
• CPC Class Codes: A46B 2200/1066 Toothbrush for cleaning the teeth or dentures A61C17/16 takes precedence; bristles arrangements for toothbrushes A46B9/04

Abstract

A toothbrush having a polishing paste compartment and a plunger apparatus for forcing paste through a passageway into communication with the bristles of the toothbrush. The compartment for containing the paste may be either a refillable container or cartridge or a disposable cartridge. The plunger is operated by a thumb wheel drive located at the end of the toothbrush handle.

Claims

1. A paste feed toothbrush comprising an elongated shank member having bristles and a passageway extending from one end of the shank member into open communication with the bristles, an elongated hollow cylindrical handle member having the first end securable to the shank member, a paste compartment in the handle member in communication with the shank passageway when the handle is secured to the shank, a piston member slidably carried in the paste compartment, an elongated hollow piston rod carried by the piston and extending toward the second end of the handle member, a drive knob member rotatably carried by the second end of the handle member, an elongated rotary drive rod secured to the drive knob and having a polygonal shaped cross-section and extending toward the first end of the handle, said rod being loosely receivable within the hollow piston rod, a rotary drive disc having a polygonal shaped aperture therein for slidably receiving the drive rod therethrough and for rotating with said drive rod, said drive disc being threadably disposed within the handle member and engageable with the outer end of the piston rod whereby upon rotation of the drive knob and associated drive rod, the drive disc threadably moves along the interior of the handle toward the first end thereof thereby pushing the piston through the paste compartment forcing the paste into communication with the bristles.

2. A paste feed toothbrush comprising an elongated shank member having bristles and a passageway extending from one end of the shank member into open communication with the bristles, an elongated hollow cylindrical handle member having a first end securable to the shank member, a paste compartment in the handle member in communication with the shank passageway when the handle is secured to the shank, a removable paste cartridge member removably disposed within the paste compartment in the handle member, said cartridge member having an open end in communication with the shank passageway, said cartridge further comprising a piston member slidably carried therein, an elongated hollow piston rod carried by the piston member and extending toward the second end of the handle member, a drive knob member rotatably carried by the second end of the handle, and an elongated rotary drive rod secured to the drive knob and having a cross-sectional shape providing a wrenching element and extending toward the first end of the handle member said rod being loosely receivable within the hollow piston rod, a rotary drive disc having an aperture which serves as a wrenching element recess for slidably receiving the drive rod therethrough and for rotating with said drive rod, said drive disc being threadably disposed in the handle member and engagable with the outer end of the piston rod whereby upon rotation of the drive knob and associated drive rod, the drive disc threadably moves along the interior of the handle toward the first end thereof thereby pushing the piston through the cartridge forcing paste into communication with the bristles.

3. A paste feed toothpaste as set forth in claim 2 wherein the piston rod is constructed as an integral part of the piston.

4. A paste feed toothbrush as set forth in claim 2 wherein one end of the cartridge is provided with a nozzle member, the exterior shape thereof being in conformity with the interior shape of the shank member.

5. A paste feed toothbrush as set forth in claim 2 wherein the shank member and first end of the handle member are cooperatively threaded for attaching the shank member to the handle member.