Bristle extruding toothbrush

Abstract

The present concept is a bristle extruding toothbrush and the method of the bristle extruding toothbrush replacing its own bristles. Polymer is stored in a reservoir in the body of the toothbrush before being heated and urged into an extrusion cavity by a screw housed in the reservoir. Molten polymer is extruded through bristle apertures on the extrusion face found on the brush head to form bristles by the action of an extrusion mold plunger.

Claims

1. A bristle extruding toothbrush comprises; a) a heated body with a reservoir for receiving polymer therein; b) a screw housed within the reservoir for urging polymer into an extrusion cavity in a brush head connected to the body; c) the brush head includes an extrusion face with bristle apertures; d) a means for extruding polymer out of the extrusion cavity and through the bristle apertures thereby forming a bristle extrusion which includes bristles.

2. The bristle extruding toothbrush claimed in claim 1 wherein the screw couples to an external dock for reciprocating and rotating the screw within the reservoir while coupled to the dock.

3. The bristle extruding toothbrush claimed in claim 2 wherein the dock includes a motor drive coupled to the screw.

4. The bristle extruding toothbrush claimed in claim 1 wherein the toothbrush further including heating elements in the body for heating the polymer to an extrusion temperature.

5. The bristle extruding toothbrush claimed in claim 1 wherein the toothbrush further including heating elements in the screw for heating the polymer to an extrusion temperature.

6. The bristle extruding toothbrush claimed in claim 1 wherein the extruding means includes an extrusion mold which releasably connects to the brush head, the extrusion mold includes a plunger which is slide-ably fit within the extrusion cavity and urges polymer out of the extrusion cavity and through the bristle apertures thereby forming the bristle extrusion.

7. The bristle extruding toothbrush claimed in claim 1 wherein the extrusion mold includes an advancement mechanism for urging the plunger into the extrusion cavity.

8. The bristle extruding toothbrush claimed in claim 1 wherein the brush head further includes a removable back on one side, and the extrusion face on the other side.

9. The bristle extruding toothbrush claimed in claim 8 wherein the bristle extrusion is removable by detaching the removable back and the extrusion face from the brush head and the bristle extrusion.

10. The bristle extruding toothbrush claimed in claim 1 wherein the polymer is preferably selected from the nylon family of polymers.

11. The bristle extruding toothbrush claimed in claim 1 wherein the polymer preferably heated to between 190 and 230 degrees Celsius.

12. The bristle extruding toothbrush claimed in claim 1 wherein the polymer preferably heated to between 200 and 220 degrees Celsius.

13. The bristle extruding toothbrush claimed in claim 1 further including a removable bottom cap for adding polymer to the reservoir.

14. A method of extruding bristles from the brush head of a toothbrush comprising the steps: a) fill a reservoir in the toothbrush body with polymer; b) connect a bottom end of the body to a dock with a brush head downward, and place the brush head into an extrusion mold; c) push an extrude button to activate an extrusion process; d) a screw and neck heater warms the polymer to a molten extrusion temperature; e) a motor drive in the dock reciprocates and turns the screw urging the polymer along a neck channel and into an extrusion cavity; f) advancing an extrusion mold plunger to urge the molten polymer through bristle apertures thereby forming new bristles.

15. The method claimed in claim 14 wherein step a is replaced with step a as follows: a) removing the bottom cap from the body to fill a reservoir in the toothbrush body with polymer and reinstalling the bottom cap.

16. The method claimed in claim 14 further including the step of removing the tooth brush from the dock and the extrusion mold.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The present concept will be described by way of example only with reference to the following drawings in which:

(2) FIG. 1 is a schematic cross sectional side view of the present concept a toothbrush which has the ability to extrude bristles.

(3) FIG. 2 is a schematic cross sectional view of the toothbrush shown in FIG. 1 in the inverted position shown connected to a dock at the top portion and an extrusion mold at the bottom portion.

(4) FIG. 3 is a schematic perspective assembly view of the top portion of the brush showing the brush head, the extrusion face and the removable back.

(5) FIG. 4 is a schematic side assembly view of the brush head together with the removable back, the extrusion face and a bristle extrusion.

(6) FIG. 5 is a schematic perspective partial cut away view of the screw showing screw heaters embedded within the screw.

(7) FIG. 6 is a partial schematic perspective view of the body showing the removable bottom cap.

(8) FIG. 7 is a schematic diagram showing the direction of flow of the polymer through the body.

(9) FIG. 8 is a table showing the method of extruding bristles from the head of a toothbrush comprising the steps as shown in FIG. 8.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(10) Referring first of all to FIGS. 1 through 7 the present concept is toothbrush 100 which includes the following major components namely body 102, brush head 104, bottom cap 106, screw 108 and neck 110.

(11) Brush head 104 includes a removable back 112, an extrusion face 114, an extrusion cavity 116 and bristle apertures 118.

(12) The lower portion of the body 102 of toothbrush 100 defines a reservoir 120 which will house polymer 122 therein.

(13) In FIG. 1 toothbrush 100 is shown connected to dock 126 which contains a motor drive 128 and connects to the bottom end 130 of body 102 as schematically depicted in FIG. 1.

(14) Dock 126 makes a mechanical connection between the motor drive 128 and the screw 108 thereby both reciprocating and rotating screw 108 when motor drive 128 is activated.

(15) FIG. 1 further depicts channel 132 through which the polymer 122 flows as well as heating elements 134 which surround channel 132 to ensure that the polymer 122 remains molten as it flows through channel 132. FIG. 1 also depicts an extrude button 136 which is depressed in order to initiate the extruding action of toothbrush 100.

(16) Now referring to FIG. 2 which shows toothbrush 100 in the inverted position wherein the bottom end 130 is releasably attached to dock 126 and the brush head 104 is also releaseably engaged within extrusion mold 140. In the inverted position shown in FIG. 2 toothbrush 100 is in a position in which extrusion of new bristles can take place.

(17) By depressing extrude button 136 the motor drive 128 as well as connections to the internal heaters is activated thereby heating polymer 122 located within reservoir 120 of body 102. The action of screw 108 forces molten polymer 148 down the length of the body 102 of toothbrush 100 and through channels 132 and into extrusion cavity 116.

(18) Once molten polymer 148 is located in extrusion cavity 116 a plunger 142 forceably urges molten polymer 148 out through bristle apertures 118 thereby forming bristles 146. An advancement screw 144 or other advancement mechanism within extrusion mold 140 is used to urge plunger 142 into extrusion cavity 116.

(19) Extrusion mold 140 is releaseably attached to the neck 110 as well as the brush head 104.

(20) Neck heaters 150 as well as screw heaters 152 maintain polymer 122 in its molten state namely molten polymer 148.

(21) FIG. 2 depicts the flow of molten polymer as 156 shown as polymer flow flowing downwardly along body 102 through channels 132 and into extrusion cavity 116.

(22) Referring now to FIGS. 3 which is an assembly of the removable back 112, the brush head 104 and the extrusion face 114.

(23) Both the removable back and the extrusion face are clipped into position onto brush head 104 and can be removed for cleaning purposes and also for the purpose of removing a bristle extrusion 160.

(24) Referring now to FIG. 4 which shows an exploded assembly view of removable back 112, brush head 104, extrusion face 114 as well as a bristle extrusion 160.

(25) Once bristles 146 have worn to the point where there are no longer usable it is necessary to remove removable back in order to extract the spent bristle extrusion from brush head 104. In cases where cleaning is necessary it is also possible to remove extrusion face 114 thereby being able to completely clean brush head 104, removable back 112 and extrusion face 114 separately.

(26) FIG. 5 depicts screw 108 and in cut away fashion shows screw heater 152 running through roughly the centre of screw 108 for heating of screw 108 and ultimately the polymer 122 surrounding screw 108. There is a coupling 162 at the bottom end of screw 108 which couples with motor drive 128.

(27) FIG. 6 depicts body 102 and removable bottom cap 106.

(28) FIG. 7 depicts schematically the direction of flow 156 of molten polymer 148 through the body and out through to the neck.

(29) A method of extruding bristles from the head of toothbrush 100 is summarized in FIG. 8 as follows:

(30) Step 1 requires removing the bottom cap from the body and filling the reservoir with polymer. The polymer can be in the form of pellets, powder or granules or may even be in the form of a liquid.

(31) The next step is to connect the bottom end 130 to a dock 126 with the brush head 104 downward and the top end inserted into an extrusion mold 140.

(32) The next step is to push the extrude button 136 to activate the extrusion process.

(33) The next step is the activation of screw 108 and the heating elements 134 including the neck heater 150 and the screw heater 152 thereby warming the polymer 122. This forms a molten polymer 148 which has the ability to flow through channel 132 and into extrusion cavity 116.

(34) The screw 108 is coupled to motor drive 128 which reciprocates and turns thereby urging the polymer along the neck channel 132 and into the extrusion cavity 116.

(35) In the next step with the extrusion mold removeably snapped into place onto the brush head and neck 110 portion of brush 100, the plunger 142 advances to urge molten polymer 148 through the bristle apertures 118 of extrusion face 114 thereby forming new bristles 146.

(36) In the last step the toothbrush is removed from the dock and the extrusion mold is ready for use.

(37) It should be apparent to persons skilled in the arts that various modifications and adaptation of this structure described above are possible without departure from the spirit of the invention the scope of which defined in the appended claim.