# US 2018/0021118 A1 · Electric motorized toothbrush with rotating spindles > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0021118 A1 - Document ID: US20180021118A1 - Status: Published application - Kind: A1 - Application number: 15/215,250 - Filed: 2016-07-20 - Published: 2018-01-25 - Earliest claimed: 2016-07-20 - Inventors: David Hauser - Web page: https://patentgrep.com/patent/US20180021118A1 ## CPC - A46B 13/02: power-driven {carriers} - A46B 9/026: {where the surface of the brush body or carrier is not in one plane, e.g. not flat (A46B9/005 takes precedence)} - A46B 9/04: {Arranged like in or} for toothbrushes - A46B 13/001: {Cylindrical or annular brush bodies} - A61C 17/3418: {Rotation around the axis of the toothbrush handle} - A61C 17/349: {with multiple brush bodies} - A46B 2200/1066: Toothbrush for cleaning the teeth or dentures (A61C17/16 takes precedence; bristles arrangements for toothbrushes A46B9/04) - A46B: BRUSHES (handles not integral with brushware B25G) - A61C: DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE (non-driven toothbrushes A46B; {tongue scrapers A61B17/24;} preparations for dentistry A61K6/00; preparations for cleaning the teeth or mouth A61K8/00, A61Q11/00) ## Abstract An electric motorized toothbrush with a pair of bristle units spaced apart from each other by a gap and a third bristle unit bordering the gap by being closer to each of the bristle units of the pair than the bristle units of the pair are to each other. A motorized gear transmission, via associated spindles, rotates the pair of bristle units in opposite directions and either rotates or reciprocates the third bristle unit. The bristle units of the pair include a respective cylinder and bristles that extend radially outward from the respective cylinder and the bristles may be of varying lengths. The bristles rotate in a direction away from the gum line while the teeth are inserted into the gap. ## Claims ### Claim 1 An electric, motorized toothbrush, comprising: a handle supporting a head; a motor driven gear drive transmission within at least one of the handle and the head; two bristle units within the head, the two bristle units being driven into motion by the motor driven gear drive transmission to rotate in opposite direction relative to each other, the two bristle units each having respective spindles with bristles that extend in radially outward directions from the respective spindles, the two bristle units being spaced apart from each other by a gap; and a third bristle unit that is adjacent to the gap and closer to each of the two bristle units than the two bristle units are to each other and being driven into motion by the motor driven gear drive transmission, the two bristle units each having a side facing the third bristle unit, the head including a housing that contains the two bristle units and the third bristle unit yet leaves the gap accessible from outside the housing; wherein the two bristle units carry out their rotation in the opposite direction by entering the gap before reaching the side facing the third bristle unit. ### Claim 2 (depends on 1) The electric, motorized toothbrush of claim 1, wherein each of the respective spindles have repeating patterns of the bristles across a substantial length of the respective cylinders, some of the bristles having bristle lengths that are longer than the bristle lengths of the remaining bristles. ### Claim 3 (depends on 1) The electric, motorized toothbrush of claim 1, further comprising: a power source within the handle that powers the motor. ### Claim 4 (depends on 1) The electric, motorized toothbrush of claim 1, wherein the two bristle units each include a respective cylinder with brushes into which is inserted an associated one of the respective spindles without brushes, the motor driven gear drive transmission being arranged to rotate the respective spindles that in turn rotate the respective cylinders and thereby the bristles. ### Claim 5 (depends on 1) The electric, motorized toothbrush of claim 1, wherein the gear drive transmission is within the head, further comprising a motor of the motor driven gear drive transmission that is within the handle. ### Claim 6 (depends on 1) The electric, motorized toothbrush of claim 1, wherein the motor driven gear drive transmission drives the third bristle unit to rotate. ### Claim 7 (depends on 1) The electric, motorized toothbrush of claim 1, wherein the motor driven gear drive transmission drives the third bristle unit in a reciprocating manner. ### Claim 8 An electric, motorized toothbrush, comprising: a head; a motor driven gear drive transmission within the head; two bristle units within the head, the two bristle units being driven into motion by the motor driven gear drive transmission to rotate in opposite direction relative to each other, the two bristle units each having respective spindles with bristles that extend in radially outward directions from the respective spindles, the two bristle units being spaced apart from each other by a gap; and a third bristle unit that is adjacent the gap and closer to each of the two bristle units than the two bristle units are to each other and being driven into motion by the motor driven gear drive transmission, the two bristle units each having a side facing the third bristle unit, the head having a housing that contains the two bristle units and the third bristle unit yet leaves the gap accessible from outside the housing. wherein the two bristle units carry out their rotation in the opposite direction by entering the gap before reaching the side facing the third bristle unit. ### Claim 9 (depends on 8) The electric, motorized toothbrush of claim 8, wherein each of the respective spindles have repeating patterns of the bristles across a substantial entire length of the respective cylinders, some of the bristles having bristle lengths that are longer than bristle lengths for the remaining bristles. ### Claim 10 (depends on 8) The electric, motorized toothbrush of claim 8, wherein the two bristle units each include a respective cylinder with bristles into which is inserted an associated one of the respective spindles without bristles, the motor driven gear drive transmission being arranged to rotate the respective spindles that in turn rotate the respective cylinders and thereby the bristles. ### Claim 11 (depends on 8) The electric, motorized toothbrush of claim 8, wherein the motor driven gear drive transmission drives the third bristle unit to rotate. ### Claim 12 (depends on 8) The electric, motorized toothbrush of claim 8, wherein the motor driven gear drive transmission drives the third bristle unit in a reciprocating manner. ### Claim 13 A electric, motorized toothbrush head, comprising: two bristle units each having respective spindles with bristles that extend in radially outward directions from the respective spindles, the two bristle units being spaced apart from each other by a gap; a third bristle unit that is adjacent the gap yet closer to each of the two bristle units than the two bristle units are to each other; and a housing that contains the two bristle units and the third bristle unit yet leaves the gap accessible from outside the housing. ### Claim 14 (depends on 13) The electric, motorized toothbrush of claim 13, wherein each of the respective spindles have repeating patterns of the bristles across a substantial entire length of the respective spindle, some of the bristles having bristle lengths that are longer than bristle lengths for the remaining bristles. ### Claim 15 (depends on 13) The electric, motorized toothbrush of claim 13, wherein the two bristle units each include a respective cylinder with bristles into which is inserted an associated one of the respective spindles without bristles, the motor driven gear drive transmission being arranged to rotate the respective spindles that in turn rotate the respective cylinders and thereby the bristles.