# US 11,439,488 B2 · Brushhead for power toothbrush > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,439,488 B2 - Document ID: US11439488B2 - Status: Granted - Kind: B2 - Application number: 17/396,176 - Filed: 2021-08-06 - Published: 2022-02-10 - Granted: 2022-09-13 - Earliest claimed: 2020-08-07 - Applicants: Juan-Yun Kuang - Inventors: Juan-Yun Kuang - Web page: https://patentgrep.com/patent/US11439488B2 ## CPC - A61C 17/222: {Brush body details, e.g. the shape thereof or connection to handle} - A46B 17/04: Protective covers for the bristles - A61C 17/22: with brushes, cushions, cups, or the like (brush bodies, e.g. arrangements of the bristles A46B) - A61C 17/34: driven by electric motor - A61C 17/3481: {Vibrating brush body, e.g. by using eccentric weights} - 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) - A46B: BRUSHES (handles not integral with brushware B25G) ## Abstract The present disclosure provides a brushhead for a power toothbrush, and the power toothbrush. The brushhead configured for an electric toothbrush, the brushhead being detachably installed on a handle of the electric toothbrush, the brushhead comprising: a brushhead element; and an engaging assembly arranged in the brushhead element and connecting the brushhead element with a driving shaft, wherein the engaging assembly comprises a main body, an accommodating cavity is defined in a first end of the main body along a first direction, the accommodating cavity is configured to accommodate the driving shaft, a material of the brushhead element is different from a material of the main body, and the first direction is a direction from an end of the brushhead element connected with the handle toward an end of the brushhead element away from the handle. ## Claims ### Claim 1 A brushhead configured for an electric toothbrush, the brushhead being detachably installed on a handle of the electric toothbrush, the brushhead comprising: a brushhead element; and an engaging assembly arranged in the brushhead element and connecting the brushhead element with a driving shaft, wherein the engaging assembly comprises a main body, an accommodating cavity is defined in a first end of the main body along a first direction, the accommodating cavity is configured to accommodate the driving shaft, a material of the brushhead element is different from a material of the main body, and the first direction is a direction from an end of the brushhead element connected with the handle toward an end of the brushhead element away from the handle, and wherein a wear resistance of the material of the main body is higher than a wear resistance of the material of the brushhead element, and the brushhead element abuts against the drive shaft without an elastic member. ### Claim 2 (depends on 1) The brushhead according to claim 1, wherein the main body comprises a cavity wall forming a receiving cavity, the cavity wall is provided with an abutting portion, and the abutting portion is configured for abutting at least a portion of the driving shaft, and the abutting portion is a rigid structure having low elasticity. ### Claim 3 (depends on 2) The brushhead according to claim 2, wherein the receiving cavity accommodates a first metal portion of the driving shaft, and a shape of the receiving cavity matches a shape of the first metal portion. ### Claim 4 (depends on 3) The brushhead for the power toothbrush according to claim 3, wherein the abutting portion abuts against the first metal portion. ### Claim 5 (depends on 3) The brushhead according to claim 3, wherein the brushhead element comprises an accommodating portion, and the accommodating portion accommodates the engaging assembly. ### Claim 6 (depends on 5) The brushhead according to claim 5, wherein the brushhead element comprises a bottom surface and a side surface arranged around the bottom surface, the accommodating portion is on the side surface of the brushhead element, the accommodating portion comprises a first containing cavity and a notch, the first containing cavity accommodating the main body, the engaging assembly further comprises a cover, and the cover is fixedly arranged in the notch. ### Claim 7 (depends on 6) The brushhead according to claim 6, wherein a material of the cover is the same as a material of the brushhead element. ### Claim 8 (depends on 7) The brushhead according to claim 7, wherein the brushhead element further comprises a first space-keeping cavity and a second space-keeping cavity along the first direction, when the brushhead is in an assembled state, the receiving cavity and the second space-keeping cavity are respectively located at both ends of the first space-keeping cavity, and the first space-keeping cavity and the second space-keeping cavity respectively accommodate a second metal portion and a fixing portion of the handle, the first metal portion and the fixing portion are respectively located at both ends of the second metal portion. ### Claim 9 (depends on 8) The brushhead according to claim 8, wherein a wall surface of the first space-keeping cavity is not in contact with the second metal portion, and a wall surface of the second space-keeping cavity is not in contact with the fixing portion. ### Claim 10 (depends on 6) The brushhead according to claim 6, wherein the cover is fixedly connected with the brushhead element by ultrasonic welding.