# US 2025/0169002 A1 · Hinge Mechanism and Electronic Device

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- Number: US 2025/0169002 A1
- Document ID: US20250169002A1
- Status: Published application
- Kind: A1
- Application number: 19/028,526
- Filed: 2025-01-17
- Published: 2025-05-22
- Earliest claimed: 2022-12-29
- Assignees: Huawei Technologies Co., Ltd.
- Applicants: Huawei Technologies Co., Ltd.
- Inventors: Weifeng Wu; Ding Zhong; Qiang Zhan; Leilei Hua; Jiaxin Zhao
- Web page: https://patentgrep.com/patent/US20250169002A1

## CPC

- G06F 1/1681: {Details related solely to hinges (hinge details related to the transmission of signals or power are classified in G06F1/1683)}
- H05K 5/0226: {Hinges}
- F16C 11/04: Pivotal connections (hinges for doors, windows or wings E05D)
- G06F 1/16: Constructional details or arrangements
- 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}
- G06F 1/1652: {the display being flexible, e.g. mimicking a sheet of paper, or rollable}
- H04M 1/022: {The hinge comprising two parallel pivoting axes}
- H04M 1/0268: {including a flexible display panel}
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- H04M: TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08)

## Abstract

A hinge mechanism includes a base, a first rotation component, and a second rotation component, and the first rotation component and the second rotation component are disposed on two sides of the base respectively. The first rotation component includes a first support arm, a first rotation plate, a first pin shaft, and a first torsion spring. The first support arm is rotatably coupled to the base. A first side of the first rotation plate is rotatably coupled to the first support arm via the first pin shaft. The first torsion spring is sleeved on the first pin shaft, a first torsion arm of the first torsion spring is fastened to the first support arm, and a second torsion arm of the first torsion spring abuts against the first side of the first rotation plate.

## Claims

### Claim 1

A hinge mechanism comprising:
a base comprising:
a first side;
a second side;
a support surface comprising:
a third side; and
a fourth side;
a first sink step disposed on the third side; and
a second sink step disposed on the fourth side; and
a main shaft component comprising:
a first rotation component disposed on the first side and comprising:
a first pin shaft;
a first support arm rotatably coupled to the base;
a first rotation plate comprising:
a fifth side rotatably coupled to the first support arm via the first pin shaft; and
a sixth side; and
a first torsion spring sleeved on the first pin shaft and comprising:
a first torsion arm fastened to the first support arm; and
a second torsion arm abutting against the fifth side; and
a second rotation component disposed on the second side and comprising:
a second pin shaft;
a second support arm rotatably coupled to the base;
a second rotation plate comprising:
a seventh side rotatably coupled to the second support arm via the second pin shaft; and
an eighth side; and
a second torsion spring sleeved on the second pin shaft and comprising:
a third torsion arm fastened to the second support arm; and
a fourth torsion arm abutting against the seventh side,
wherein when the hinge mechanism is switched from an unfolded state to a folded state, the first support arm and the second support arm are configured to rotate toward each other, the first torsion spring is configured to drive the first rotation plate to rotate relative to the first support arm to make the sixth side rotate from a first state of forming a lap joint with the first sink step to a second state of being attached to the first support arm, and the second torsion spring is configured to drive the second rotation plate to rotate relative to the second support arm to make the eighth side rotate from a third state of forming a lap joint with the second sink step to a fourth state of being attached to the second support arm, and
wherein when the hinge mechanism is switched from the folded state to the unfolded state, the first support arm and the second support arm are configured to rotate away from each other, the sixth side is configured to rotate from the second state to the first state and to drive the first torsion spring to reset, and the eighth side is configured to rotate from the fourth state to the third state and to drive the second torsion spring to reset.

### Claim 2 (depends on 1)

The hinge mechanism of claim 1, wherein the first rotation plate further comprises a ninth side that is disposed away from the first sink step and that comprises a first surface, wherein the second rotation plate further comprises a tenth side that is disposed away from the second sink step and that comprises a second surface, and wherein when the hinge mechanism is in the unfolded state, the first surface is aligned with the support surface, and the second surface is aligned with the support surface.

### Claim 3 (depends on 1)

The hinge mechanism of claim 1, wherein the first support arm further comprises a ninth side facing the first rotation plate, wherein the second support arm further comprises a tenth side facing the second rotation plate, wherein the hinge mechanism further comprises:
a first groove disposed on the ninth side; and
a second groove disposed on the tenth side, and
wherein when the hinge mechanism is in the folded state, the first rotation plate is disposed in the first groove, and the second rotation plate is disposed in the second groove.

### Claim 4 (depends on 1)

The hinge mechanism of claim 1, wherein the first support arm further comprises a ninth side, wherein the second support arm further comprises a tenth side, and wherein the hinge mechanism further comprises:
a first convex lug disposed on the fifth side and the ninth side;
a first through hole disposed on the first convex lug, wherein the first pin shaft is rotatably disposed in the first through hole;
a second convex lug disposed on the seventh side the tenth side; and
a second through hole disposed on the second convex lug, wherein the second pin shaft is rotatably disposed in the second through hole.

### Claim 5 (depends on 4)

The hinge mechanism of claim 4, further comprising:
a first limiting groove disposed on the first convex lug and comprising a first opening disposed away from the sixth side wherein the second torsion arm is disposed in the first limiting groove; and
a second limiting groove disposed on the second convex lug and comprising a second opening disposed away from the eighth side wherein the fourth torsion arm is disposed in the second limiting groove.

### Claim 6 (depends on 4)

The hinge mechanism of claim 4, wherein the first convex lug comprises:
a first surface that is disposed away from the first support arm; and
a second surface,
wherein the second convex lug comprises:
a third surface that is disposed away from the second support arm; and
a fourth surface,
wherein the hinge mechanism further comprises:
a first stopper disposed on the first surface and comprising a first extension rib, wherein the first extension rib and the first convex lug are spaced apart from each other, and wherein a first projection of the first extension rib on the second surface covers a first part of the first through hole; and
a second stopper disposed on the second and comprising a second extension rib, wherein the second extension rib and the second convex lug are spaced apart from each other, and wherein a second projection of the second extension rib on the fourth surface covers a second part of the second through hole,
wherein the first pin shaft comprises a first end part disposed between the first convex lug and the first extension rib, and
wherein the second pin shaft comprises a second end part disposed between the second convex lug and the second extension rib.

### Claim 7 (depends on 1)

The hinge mechanism of claim 1, further comprising:
a first arc-shaped groove disposed on the base; and
a second arc-shaped groove disposed on the base,
wherein the first support arm further comprises a first arc-shaped rotation block rotatably disposed in the first arc-shaped groove, and
wherein the second support arm comprises a second arc-shaped rotation block rotatably disposed in the second arc-shaped groove.

### Claim 8 (depends on 7)

The hinge mechanism of claim 7, wherein the first arc-shaped groove and the second arc-shaped groove are staggered in a length direction of the hinge mechanism.

### Claim 9 (depends on 7)

The hinge mechanism of claim 7, wherein the first arc-shaped groove comprises a first arc-shaped sub-groove and a second arc-shaped sub-groove that are spaced apart from each other in a length direction of the hinge mechanism, and wherein the first arc-shaped rotation block comprises:
a first rotation sub-block slidably disposed in the first arc-shaped sub-groove; and
a second rotation sub-block that is spaced with the first rotation sub-block in the length direction and that is slidably disposed in the second arc-shaped sub-groove,
wherein the second arc-shaped groove comprises a third arc-shaped sub-groove and a fourth arc-shaped sub-groove that are spaced apart from each other in the length direction,
wherein the second arc-shaped rotation block comprises:
a third rotation sub-block slidably disposed in the third arc-shaped sub-groove; and
a fourth rotation sub-block that is spaced with the third rotation sub-block in the length direction and that is slidably disposed in the fourth arc-shaped sub-groove,
wherein the first sink step is disposed between the first arc-shaped sub-groove and the second arc-shaped sub-groove, and
wherein the second sink step is disposed between the third arc-shaped sub-groove and the fourth arc-shaped sub-groove.

### Claim 10 (depends on 7)

The hinge mechanism of claim 7, wherein the first support arm further comprises a first fastening block coupled to the first arc-shaped rotation block and comprising a first end surface, wherein the second support arm further comprises a second fastening block coupled to the second arc-shaped rotation block and comprising a second end surface, wherein the first end surface is disposed opposite to the second end surface when the hinge mechanism is in the folded state, and wherein the first end surface and the second end surface are separately aligned with the support surface when the hinge mechanism is in the unfolded state.

### Claim 11 (depends on 7)

The hinge mechanism of claim 7, wherein the first arc-shaped rotation block in a length direction of the hinge mechanism comprises an end comprising a first cam surface, and wherein the hinge mechanism further comprises:
a first mounting hole extended in the length direction, disposed on the base, and in communication with the first arc-shaped groove; and
a first damping component mounted in the first mounting hole and comprising:
a first stop block fastened to the first mounting hole and comprising a ninth side facing the first arc-shaped groove;
a first cam disposed on the ninth side and comprising a tenth side, wherein the tenth side comprises a second cam surface abutting against the first cam surface; and
a first elastic member between the first stop block and the first cam, wherein the tenth side is disposed away from the first elastic member.

### Claim 12 (depends on 7)

The hinge mechanism of claim 7, wherein the first arc-shaped rotation block comprises a first outer arc wall, wherein the second arc-shaped rotation block comprises a second outer arc wall, and wherein the hinge mechanism further comprises a synchronization component comprising:
a first gear tooth disposed on the first outer arc wall; and
a second gear tooth disposed on the second outer arc wall and connected to the first gear tooth.

### Claim 13 (depends on 12)

The hinge mechanism of claim 12, wherein the synchronization component further comprises:
a first rack slidably disposed on the base and meshed with the first gear tooth;
a second rack slidably disposed on the base and meshed with the second gear tooth, wherein the first rack and the second rack are spaced apart from each other in a length direction of the hinge mechanism; and
a synchronization gear disposed between the first rack and the second rack and separately meshed with the first rack and the second rack.

### Claim 14 (depends on 13)

The hinge mechanism of claim 13, wherein the base further comprises a ninth side disposed away from the support surface, and wherein the hinge mechanism further comprises:
a first opening groove disposed in the ninth side and in communication with the first arc-shaped groove, wherein the first gear tooth is disposed in a first area in which the first arc-shaped rotation block is exposed to the first opening groove, and wherein the first rack is slidably disposed in the first opening groove; and
a second opening groove disposed in the ninth side and in communication with the second arc-shaped groove, wherein the second gear tooth is disposed in a second area in which the second arc-shaped rotation block is exposed to the second opening groove, and wherein the second rack is slidably disposed in the second opening groove.

### Claim 15 (depends on 1)

The hinge mechanism of claim 1, wherein the base further comprises a ninth side disposed away from the support surface, and wherein the hinge mechanism further comprises an end cover disposed on the ninth side.

### Claim 16

An electronic device comprising:
a hinge mechanism comprising:
a base comprising:
a first side;
a second side;
a support surface comprising:
a third side; and
a fourth side;
a first sink step disposed on the third side; and
a second sink step disposed on the fourth side; and
a main shaft component comprising:
a first rotation component disposed on the first side and comprising:
a first pin shaft;
a first support arm rotatably coupled to the base;
a first rotation plate comprising: a fifth side rotatably coupled to the first support arm via the first pin shaft; and a sixth side;
a first torsion spring sleeved on the first pin shaft and comprising:
a first torsion arm fastened to the first support arm; and
a second torsion arm abutting against the fifth side; and
a second rotation component disposed on the second side and comprising:
a second pin shaft;
a second support arm rotatably coupled to the base;
a second rotation plate comprising: a seventh side rotatably coupled to the second support arm via the second pin shaft; and an eighth side; and
a second torsion spring sleeved on the second pin shaft and comprising: a third torsion arm fastened to the second support arm; and a fourth torsion arm abutting against the seventh side,
wherein when the hinge mechanism is switched from an unfolded state to a folded state, the first support arm and the second support arm are configured to rotate toward each other, the first torsion spring is configured to drive the first rotation plate to rotate relative to the first support arm to make the sixth side rotate from a first state of forming a lap joint with the first sink step to a second state of being attached to the first support arm, and the second torsion spring is configured to drive the second rotation plate to rotate relative to the second support arm to make the eighth side rotate from a third state of forming a lap joint with the second sink step to a fourth state of being attached to the second support arm, and
wherein when the hinge mechanism is switched from the folded state to the unfolded state, the first support arm and the second support arm are configured to rotate away from each other, the sixth side is configured to rotate from the second state to the first state and to drive the first torsion spring to reset, and the eighth side is configured to rotate from the fourth state to the third state and to drive the second torsion spring to reset;
a first housing fastened to the first support arm;
a second housing fastened to the second support arm, wherein the first housing and the second housing are separately disposed on two sides of the hinge mechanism; and
a flexible display fastened to the first housing and the second housing and configured to continuously cover the first housing, the second housing, and the hinge mechanism.

### Claim 17 (depends on 16)

The electronic device of claim 16, wherein the first rotation plate further comprises a ninth side that is disposed away from the first sink step and that comprises a first surface, wherein the second rotation plate further comprises a tenth side that is disposed away from the second sink step and that comprises a second surface, and wherein when the hinge mechanism is in the unfolded state, the first surface is aligned with the support surface, and the second surface is aligned with the support surface.

### Claim 18 (depends on 16)

The electronic device of claim 16, wherein the first support arm further comprises a ninth side facing the first rotation plate, wherein the second support arm further comprises a tenth side facing the second rotation plate, wherein the hinge mechanism further comprises:
a first groove disposed on the ninth side; and
a second groove disposed on the tenth side, and
wherein when the hinge mechanism is in the folded state, the first rotation plate is disposed in the first groove, and the second rotation plate is disposed in the second groove.

### Claim 19 (depends on 16)

The electronic device of claim 16, wherein the first support arm further comprises a ninth side, wherein the second support arm further comprises a tenth side, and wherein the hinge mechanism further comprises:
a first convex lug disposed on the fifth side and the ninth side;
a first through hole disposed on the first convex lug, wherein the first pin shaft is rotatably disposed in the first through hole;
a second convex lug disposed on the seventh side and the tenth side; and
a second through hole disposed on the second convex lug, wherein the second pin shaft is rotatably disposed in the second through hole.

### Claim 20 (depends on 19)

The electronic device of claim 19, further comprising:
a first limiting groove disposed on the first convex lug and comprising a first opening disposed away from the sixth side, wherein the second torsion arm is disposed in the first limiting groove; and
a second limiting groove disposed on the second convex lug and comprising a second opening disposed away from the eighth side, wherein the fourth torsion arm is disposed in the second limiting groove.