# US 11,896,116 B1 · Electric toothbrush rotating replacement head device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,896,116 B1 - Document ID: US11896116B1 - Status: Granted - Kind: B1 - Application number: 18/335,966 - Filed: 2023-06-15 - Granted: 2024-02-13 - Earliest claimed: 2023-06-15 - Assignees: Shenzhen Blue Dream Digital Technology Co., Ltd. - Applicants: Shenzhen Blue Dream Digital Technology Co., Ltd. - Inventors: Mingyuan Li - Web page: https://patentgrep.com/patent/US11896116B1 ## CPC - A46B 5/0095: {Removable or interchangeable brush heads} - A46B 9/04: {Arranged like in or} for toothbrushes - A61C 17/222: {Brush body details, e.g. the shape thereof or connection to handle} - A61C 17/26: driven by electric motor - A61C 17/34: driven by electric motor - A61C 17/3436: {Rotation around the axis perpendicular to the plane defined by the bristle holder} - 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 toothbrush rotating replacement head device includes a toothbrush replacement head body. The toothbrush replacement head body includes a toothbrush handle and a toothbrush head, the toothbrush handle defines a cavity, the toothbrush head is disposed on a top of the cavity, an inside of the cavity is provided with an elastic connecting rod, a bottom of the elastic connecting rod is provided with a spring limiting disc, a top of the elastic connecting rod defines a first pin hole, the elastic connecting rod is disposed in a compression spring, and the compression spring is disposed on the spring limiting disc. The toothbrush head includes a convex block, the convex block defines a second pin hole, and the elastic connecting rod is inserted into the second pin hole and connected to the toothbrush head through the pin. ## Claims ### Claim 1 An electric toothbrush rotating replacement head device, wherein the device comprises a toothbrush replacement head body, the toothbrush replacement head body comprises a toothbrush handle and a toothbrush head, the toothbrush handle defines a cavity, and the toothbrush head is disposed on a top of the cavity; the device comprises: an elastic connecting rod disposed in the cavity, and a top of the elastic connecting rod defining a first pin hole; a spring limiting disc disposed on a bottom of the elastic connecting rod; a pin disposed in the first pin hole, and a diameter of the first pin hole being greater than a diameter of the pin; a first spring limiting block and a second spring limiting block disposed on two sides of the elastic connecting rod respectively; and a compression spring disposed on the spring limiting disc, and the elastic connecting rod being disposed in the compression spring; and the toothbrush head comprises a convex block, the convex block defines a second pin hole, and the elastic connecting rod is inserted into the second pin hole through the pin and connected to the toothbrush head. ### Claim 2 (depends on 1) The electric toothbrush rotating replacement head device as claimed in claim 1, wherein the elastic connecting rod defines an installation groove disposed above the first spring limiting block and the second spring limiting block. ### Claim 3 (depends on 2) The electric toothbrush rotating replacement head device as claimed in claim 2, wherein a part of the elastic connecting rod from the installation groove to the pin is in a bent shape. ### Claim 4 (depends on 1) The electric toothbrush rotating replacement head device as claimed in claim 1, wherein the spring limiting disc defines a vent groove, and the device comprises a cross bone disposed under the spring limiting disc. ### Claim 5 (depends on 1) The electric toothbrush rotating replacement head device as claimed in claim 1, wherein the device comprises a spring sleeve, and the elastic connecting rod is disposed in the spring sleeve through the compression spring. ### Claim 6 (depends on 5) The electric toothbrush rotating replacement head device as claimed in claim 5, wherein a top of the spring sleeve defines limiting grooves. ### Claim 7 (depends on 6) The electric toothbrush rotating replacement head device as claimed in claim 6, wherein the device comprises a buckle disposed a side of the spring sleeve. ### Claim 8 (depends on 1) The electric toothbrush rotating replacement head device as claimed in claim 1, wherein the toothbrush head comprises a positioning step, and the convex block is connected to the toothbrush head through the positioning step. ### Claim 9 (depends on 8) The electric toothbrush rotating replacement head device as claimed in claim 8, wherein the toothbrush head comprises an inner cylinder disposed in the convex block and a rotating shaft disposed on the inner cylinder. ### Claim 10 (depends on 9) The electric toothbrush rotating replacement head device as claimed in claim 9, wherein the inner cylinder defines a rotating shaft hole, and the rotating shaft is connected to the inner cylinder through an interference fit between the rotating shaft hole and the rotating shaft. ### Claim 11 (depends on 10) The electric toothbrush rotating replacement head device as claimed in claim 10, wherein the toothbrush head comprises a first connecting bone and a second connecting bone, and the convex block is connected to the inner cylinder through the first connecting bone and the second connecting bone. ### Claim 12 (depends on 11) The electric toothbrush rotating replacement head device as claimed in claim 11, wherein a first spacing cavity and a second spacing cavity are provided between the first connecting bone and the second connecting bone. ### Claim 13 (depends on 12) The electric toothbrush rotating replacement head device as claimed in claim 12, wherein the toothbrush handle comprises a rotation limiting column disposed at the top of the cavity. ### Claim 14 (depends on 13) The electric toothbrush rotating replacement head device as claimed in claim 13, wherein a rotating shaft through hole is defined at a side of the rotation limiting column. ### Claim 15 (depends on 1) The electric toothbrush rotating replacement head device as claimed in claim 1, wherein the toothbrush head comprises a bristle top cover and a bristle bottom cover; the bristle top cover defines bristle holes, and the bristle bottom cover defines a glue-overflow groove. ### Claim 16 (depends on 1) The electric toothbrush rotating replacement head device as claimed in claim 1, wherein a bottom of the cavity is provided with an opening, a first elastic sheet and a second elastic sheet are disposed in the opening, an installation clamping groove is provided between the first elastic sheet and the second elastic sheet, and an avoid groove is provided between a side wall of the opening and the second elastic sheet. ### Claim 17 (depends on 16) The electric toothbrush rotating replacement head device as claimed in claim 16, wherein the first elastic sheet defines a first clamping groove and the second elastic sheet defines a second clamping groove. ### Claim 18 (depends on 17) The electric toothbrush rotating replacement head device as claimed in claim 17, wherein the first elastic sheet and the second elastic sheet comprise reinforcing blocks respectively. ### Claim 19 An electric toothbrush rotating replacement head device, wherein the device comprises a toothbrush head, a toothbrush handle, an elastic connecting rod, a compression spring, and a spring sleeve; the toothbrush handle defines a cavity, and the toothbrush head is disposed on a top of the cavity; the spring sleeve, the compression spring, and the elastic connecting rod are sequentially arranged in the toothbrush handle from outside to inside; wherein the toothbrush head comprises: a bristle top cover; a bristle bottom cover, disposed on the bristle top cover; a positioning step, disposed on the bristle bottom cover, and the bristle top cover and the positioning step being located at two sides of the bristle bottom cover; a convex block, disposed on the positioning step; a first connecting bone, connected to the convex block; a second connecting bone, connected to the convex block; wherein a first spacing cavity is provided between the first connecting bone and the second connecting bone; and an inner cylinder, disposed in the convex block; wherein the toothbrush handle defines an opening at a bottom of the cavity and a buckle hole, the buckle hole is configured to be fitted with a buckle of the spring sleeve, and the toothbrush handle comprises: a rotation limiting column, disposed at the top of the cavity and disposed in the first spacing cavity; wherein the rotation limiting column is configured to cooperate with the first connecting bone and the second connecting bone to limit a rotation angle of the toothbrush head; and a cylinder, disposed at a side of the rotation limiting column and configured to match with the inner cylinder through a rotating shaft; wherein the elastic connecting rod defines a first pin hole disposed at a top of elastic connecting rod, a pin is disposed in the first pin hole, and the compression spring is configured to drive the toothbrush head through the elastic connecting rod and the pin. ### Claim 20 An electric toothbrush rotating replacement head device, wherein the device comprises a toothbrush replacement head body, the toothbrush replacement head body comprises a toothbrush handle and a toothbrush head, the toothbrush handle defines a cavity, and the toothbrush head is disposed on a top of the cavity; wherein the device comprises: an elastic connecting rod disposed in the cavity, and a top of the elastic connecting rod defining a first pin hole; a spring limiting disc disposed on a bottom of the elastic connecting rod; a pin disposed in the first pin hole, and a diameter of the first pin hole being greater than a diameter of the pin; a compression spring disposed on the spring limiting disc, and the elastic connecting rod being disposed in the compression spring; and wherein the toothbrush head comprises a convex block, the convex block defines a second pin hole, and the elastic connecting rod is inserted into the second pin hole through the pin and connected to the toothbrush head; wherein the spring limiting disc defines a vent groove, and the device comprises a cross bone disposed under the spring limiting disc.