# US 2021/0277934 A1 · Shaft structure > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0277934 A1 - Document ID: US20210277934A1 - Status: Published application - Kind: A1 - Application number: 16/852,538 - Filed: 2020-04-19 - Published: 2021-09-09 - Earliest claimed: 2020-03-03 - Assignees: Inventec (Pudong) Technology Corporation; Inventec Corporation - Applicants: Inventec (Pudong) Technology Corporation; Inventec Corporation - Inventors: Chang-Sing GUO; En-Kuan LIN - Web page: https://patentgrep.com/patent/US20210277934A1 ## CPC - F16C 11/10: Arrangements for locking - E05D 3/122: {Gear hinges} - E05D 11/0054: {Covers, e.g. for protection} - G06F 1/1681: {Details related solely to hinges (hinge details related to the transmission of signals or power are classified in G06F1/1683)} - E05Y 2201/10: Covers; Housings - E05Y 2201/22: Locks - E05Y 2999/00: Subject-matter not otherwise provided for in this subclass - G06F 1/1616: {with folding flat displays, e.g. laptop computers or notebooks having a clamshell configuration, with body parts pivoting to an open position around an axis parallel to the plane they define in closed position} - F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS - E05D: HINGES OR SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS (pivotal connections in general F16C11/00) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - E05Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF ## Abstract A shaft structure includes a carrier, a first mandrel, and a second mandrel. The carrier has a groove, a receiving space communicated with the groove, and two protruding portions. The two protruding portions protrude from an inner wall of the carrier, and the two protruding portions are located between the receiving space and the groove. The first mandrel has a first gear, a first rotation shaft, and a first connection shaft connected to the first gear and the first rotation shaft. The first gear is located in the receiving space. The second mandrel has a second gear, a second rotation shaft, and a second connection shaft connected to the second gear and the second rotation shaft. The second gear is configured to move in the receiving space and the groove. ## Claims ### Claim 1 A shaft structure, comprising: a carrier having a groove, a receiving space communicated with the groove, and two protruding portions, wherein the two protruding portions protrude from an inner wall of the carrier, and the two protruding portions are located between the receiving space and the groove; a first mandrel having a first gear, a first rotation shaft, and a first connection shaft connected to the first gear and the first rotation shaft, wherein the first gear is located in the receiving space; and a second mandrel having a second gear, a second rotation shaft, and a second connection shaft connected to the second gear and the second rotation shaft, wherein the second gear is configured to move in the receiving space and the groove. ### Claim 2 (depends on 1) The shaft structure of claim 1, wherein the first connection shaft and the second connection shaft are configured to expand and contract along a first axis, wherein the first axis is perpendicular to a rotation direction of the first rotation shaft. ### Claim 3 (depends on 2) The shaft structure of claim 2, wherein the first rotation shaft is connected to a cover, the second rotation shaft is connected to a base, and the first connection shaft and the second connection shaft expand as an angle between the cover and the base reduces. ### Claim 4 (depends on 2) The shaft structure of claim 2, wherein the first rotation shaft is connected to a cover, the second rotation shaft is connected to a base, and the first connection shaft and the second connection shaft contract as an angle between the cover and the base increases. ### Claim 5 (depends on 1) The shaft structure of claim 1, wherein the first gear and the second gear are helical gears. ### Claim 6 (depends on 1) The shaft structure of claim 1, further comprising: a third gear meshing with the first gear and the second gear. ### Claim 7 (depends on 6) The shaft structure of claim 6, wherein a rotation direction of the third gear and a rotation direction of the first gear are alternately arranged, and the rotation direction of the third gear and a rotation direction of the second gear are alternately arranged. ### Claim 8 (depends on 6) The shaft structure of claim 6, further comprising: a retaining element disposed on the carrier, wherein the retaining element is connected to the third gear and a side wall of the carrier. ### Claim 9 (depends on 1) The shaft structure of claim 1, further comprising: a connection element having a first through hole and a second through hole, wherein the first rotation shaft penetrate the first through hole, and the second rotation shaft penetrate the second through hole. ### Claim 10 (depends on 1) The shaft structure of claim 1, further comprising: a housing wrapping the carrier, the first mandrel, and the second mandrel.