CN110969946B

CN110969946B - External folding hinge and folding display device

Info

Publication number: CN110969946B
Application number: CN201911323479.1A
Authority: CN
Inventors: 陆苏; 刘明生; 刘建军; 韦光东
Original assignee: Shenzhen Everwin Precision Technology Co Ltd
Current assignee: Shenzhen Everwin Precision Technology Co Ltd
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2022-07-08
Anticipated expiration: 2039-12-20
Also published as: CN110969946A

Abstract

An external folding hinge comprises a main shaft, a first external folding strip, a second external folding strip, a first external folding plate, a second external folding plate and a hinge assembly, wherein the first external folding strip and the second external folding plate are positioned on two transverse sides of the main shaft, the first external folding strip and the second external folding plate are positioned outside the first external folding strip and the second external folding strip, the hinge assembly is used for hinging the main shaft, the first external folding strip, the second external folding strip, the fan-shaped receiving part and the fan-shaped receiving part together; the application also provides a folding display device.

Description

External folding hinge and folding display device

Technical Field

The present invention relates to the field of communications electronics, and more particularly, to an external foldable hinge and a foldable display device.

Background

With the development of the folding screen technology, the folding screen mobile phone has become a hot spot technology. Although the folding screen can be bent, the 180-degree bending cannot be realized, and the bent part still needs to keep a certain R angle, otherwise the screen can be damaged. The existing folding mode is divided into inward folding and outward folding, namely the screen is positioned at the inner side or the outer side after being folded, and for example, Mate X issued by Huawei is outward folding. At present, the folding mechanisms for connecting two folding screens for folding are quite complex in structure, one small folding mechanism even reaches hundreds of components assembled together, and the small folding mechanism is controlled by the complex mechanism, so that the instability of the mechanism is increased, and the small folding mechanism is also one of the main reasons that the existing folding screen mobile phone cannot be put on the market in a large batch.

Disclosure of Invention

In view of the above, it is desirable to provide an external folding hinge and a foldable display device, in which the external folding hinge is hinged and folded by a plurality of hinge assemblies, and the external folding hinge is closed by a plurality of sectors disposed at both longitudinal ends and a sector receiving portion for receiving the sectors.

In order to solve the technical problem, the application provides an external folding hinge, which comprises a main shaft, a first external folding strip and a second external folding strip which are positioned at two transverse sides of the main shaft, a first external folding plate and a second external folding plate which are positioned outside the first external folding strip and the second external folding strip, and a hinge assembly which is used for hinging the main shaft, the first external folding strip and the second external folding strip with the first external folding plate and the second external folding plate, the longitudinal two ends of the main shaft, the first outer folding strip, the second outer folding strip and the first outer folding plate and the second outer folding plate are protruded along the vertical direction to form a plurality of fan-shaped parts and fan-shaped containing parts for containing the fan-shaped parts, the first and second outer folding strips and the first and second outer folding plates are folded or unfolded through the hinge assembly, when folded, the sector part is accommodated in the sector accommodating part to form a closed longitudinal end part, when unfolded, the sectors are only partially received within the sector receptacles to form closed longitudinal ends.

Preferably, the main shaft includes a first sector portion formed by protruding along the vertical direction on the inner side of the two longitudinal ends of the main shaft, a first convex portion formed by protruding outward from the middle of the outer side of the first sector portion, and a first sector-shaped accommodation portion formed on the two lateral sides of the first convex portion and located on the longitudinal outer side of the first sector portion, the first and second outward folding strips include a second sector-shaped accommodation portion formed on the inner side of the two longitudinal ends of the main shaft close to the first sector portion, a second sector portion located on the outer side of the second sector-shaped accommodation portion, a second convex portion formed on the outer end of the second sector-shaped accommodation portion, and a third sector-shaped accommodation portion located on the outer side of the second sector-shaped accommodation portion, and the first and second outward folding plates are provided with a fourth sector-shaped accommodation portion on the side close to the third sector-shaped accommodation portion, and form a sector-shaped side wall on the outer side of the fourth sector-shaped accommodation portion.

Preferably, when folded, the first sector is folded into the second sector-shaped receiving portion, the second protrusion is folded into the first sector-shaped receiving portion, the second sector is folded into the fourth sector-shaped receiving portion, and the sector-shaped side wall is folded into the third sector-shaped receiving portion.

Preferably, the main shaft, the first outer folding strip and the second outer folding strip are hinged together through a plurality of groups of first hinge assemblies and third hinge assemblies, and the first outer folding strip and the second outer folding strip are hinged together with the first outer folding plate and the second outer folding plate through a plurality of groups of second hinge assemblies.

Preferably, the first hinge assembly includes a first hinge base fixed to the main shaft and two second hinge bases fixed to the first and second outward-folding strips, the first hinge base includes a first fixing base portion provided with a screw hole, a pair of first cams extending from two longitudinal ends of the first fixing base portion toward opposite lateral directions, and a protruding shaft protruding from two longitudinal ends of the first cams, the second hinge assembly includes a second fixing base portion provided with a screw hole, a second cam extending from one lateral side of the second fixing base portion toward one side of the main shaft, and an arc-shaped groove formed in the second cam, and the protruding shaft is limited to rotate in the arc-shaped groove.

Preferably, the second hinge assembly comprises a first hinge seat fixed with the first or second outer flap and a second hinge seat fixed with the first or second outer flap, and the first hinge seat is only provided with a first cam matched with a second cam of the second hinge seat.

Preferably, the third hinge assembly comprises a third hinge seat fixed on the main shaft and two fourth hinge seats fixed on the first and second outer folding strips, the first hinge seat comprises a third fixed base part provided with a screw hole and a protruding shaft formed by longitudinally protruding two sides of the third fixed base part, and the second hinge seat comprises a fourth fixed base part provided with a screw hole, a third cam formed by extending two transverse sides of the fourth fixed base part, and an arc-shaped groove formed by matching the third cam with the protruding shaft.

In order to solve the technical problem, the present application further provides a folding display device, including the aforementioned outer folding hinge, with the relative interior folding hinge that sets up of outer folding hinge, be located outer folding hinge with between the interior folding hinge and be fixed in main epaxial balanced control mechanism, be located the first, second folded sheet of the horizontal both sides of outer folding hinge, be located first, second casing in the horizontal outside of interior folding hinge and laminate in the outer flexible screen of first, second folded sheet, the flexible screen with outer folding hinge bonding is not fixed, interior folding hinge includes the connecting axle and connect in the first of the horizontal outside of connecting axle, second interior folded sheet, interior folding hinge includes the connecting axle and is located the horizontal both sides of connecting axle and with the connecting axle rotates complex first, second interior folded sheet, first, The longitudinal outer end of the second inner folded plate is provided with a rotating shaft, and the first outer folded plate and the second outer folded plate are provided with limiting mechanisms for rotating the rotating shaft correspondingly to the rotating shaft.

Preferably, the connecting axle includes the axis body, locates the arc arch at the horizontal both ends of axis body is protruding, set up in the recess of axis body lateral surface reaches certainly the protruding fixed orifices that forms of axis body medial surface, first, second interior folded plate body includes interior folded plate body, the vertical one side of outside end of interior folded plate body be equipped with first, the outer folded plate normal running fit's of second axis of rotation, interior folded plate body is close to connecting axle one side is equipped with the arc recess, and during folding, first, second interior folded plate are located arc recess one end holds into in the recess.

Preferably, the balance control mechanism includes a pair of first rotating shafts, a pair of second rotating shafts located between the pair of first rotating shafts and connected via an internal gear, a connecting gear connecting the adjacent first rotating shafts and the second rotating shafts, and an external gear fixed on the first rotating shafts and respectively engaged with the internal gear, the internal gear includes fixing holes respectively sleeved and fixed outside the pair of second rotating shafts and a tooth structure located on the lateral outer side of the internal gear, the external gear includes an arm, a fixing hole formed at a first end of the arm and fixed outside the first rotating shaft, another tooth structure located outside the first end of the arm and engaged with the tooth structure of the internal gear, and a connecting shaft hole located at a second end of the arm and connected with the arm, the connecting gear includes a connecting shaft hole respectively sleeved and located outside the first rotating shaft and the second rotating shafts and a tooth structure engaged between the pair of second rotating shafts, the connecting gear is fixed with the first rotating shaft and can rotate relative to the second rotating shaft, and the positions of the pair of second rotating shafts are fixed; the second ends of the arms are pivotally connected to the first and second outer flaps.

The main shaft of the external folding hinge, the first and second external folding strips and the longitudinal two ends of the first and second external folding plates respectively vertically protrude to form a plurality of mutually nested fan-shaped parts and fan-shaped accommodating parts, so that the external folding hinge can seal the longitudinal outer end in the folding and unfolding states.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application.

Fig. 1 is a perspective view of a communication device of the present application;

fig. 2 is a perspective view of another angle of the communication device of the present application;

FIG. 3 is an exploded perspective view of a foldable display device according to the present application;

FIG. 4 is a perspective view of an inner folding hinge of the foldable display device of the present application and a partially enlarged view thereof;

FIG. 5 is a cross-sectional view taken along line A-A of FIG. 4;

FIG. 6 is a perspective view of an outer folding hinge, a balance control mechanism and a damping mechanism of the folding display device of the present application and a partially enlarged view thereof;

FIG. 7 is a perspective view of an outer folding hinge of the folding display device of the present application and a partially enlarged view thereof;

FIG. 8 is a perspective view of the balance control mechanism and damping mechanism of the present application;

FIG. 9 is a perspective view of the equalization control mechanism of the present application;

FIG. 10 is an exploded perspective view of the equalization control mechanism of the present application;

FIG. 11 is a cross-sectional view taken along line B-B of FIG. 9;

FIG. 12 is a perspective view of a first hinge assembly of the folding display apparatus of the present application;

FIG. 13 is a perspective view of a second hinge assembly of the folding display apparatus of the present application;

fig. 14 is a perspective view of a third hinge assembly of the foldable display device of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings.

Referring to fig. 1 to 7, the communication device of the present application includes a pair of housings 10, a pair of folding plates 20 disposed opposite to the housings 10, an inner folding hinge 30 hinged to the housings 10, an outer folding hinge 40 hinged to the folding plates 20, a balance control mechanism 50 connecting the inner folding hinge 30 and the outer folding hinge 40, a damping mechanism 70 cooperating with the balance control mechanism 50, a plurality of

hinge assemblies

70, 80, 90 for hinging the outer folding hinge 40 together, a flexible screen (not shown) attached to the folding plates 20 and the outer folding hinge 40, and an electronic component assembled between the housings 10 and the folding plates 20.

The pair of housings 10 includes a first housing 10a and a second housing 10b, and the pair of folding plates 20 includes a first plate portion 20a and a second plate portion 20 b.

The position of the flexible screen corresponding to the folding plate 20 is fixed with the folding plate 20 into a whole, and the position of the flexible screen corresponding to the outer folding hinge 40 is not fixed with the outer folding hinge 40. When folded, the pair of housings 10 are in close facing relation, and the flexible screen is located on the outside of the pair of folding plates 20. The outer folding hinge 40 is folded into an arc structure, and the flexible screen is located at the outer surface of the outer folding hinge 40 and folded into an arc structure along with the outer folding hinge 40. The inner folding hinge 30 is folded into an arcuate configuration. An equalization control mechanism 50 located between the inner folding hinge 30 and the outer folding hinge 40 controls the equalization folding along both side portions of the folding axis.

The first and

second housings

10a and 10b respectively include a base portion 11, a side wall 12 formed to protrude from the outer periphery of the base portion 11, a groove structure 13 formed on the side of the side wall base portion 11 close to the inner folding hinge 30, and a plurality of fixing holes 15 formed on the surface of the base portion 11 and fixed to the folding plate 20. The first and

second housings

10a, 10b are fixed to the first and

second folding plates

20a, 20b by rivets.

A pair of sliding seats 14 are respectively disposed at positions of the first and

second housings

10a, 10b close to the slot structure 13, and each sliding seat 14 includes a seat body 141, seat arms 143 formed by protruding from two longitudinal sides of the seat body 141, a sliding slot 142 formed between the pair of seat arms 143, and a sliding rail slot 144 opened on the seat arm 143. The side of the seat arm 143 facing the outer folding hinge 40 is spring 145.

Referring to fig. 4 and 5, the inner folding hinge 30 includes first and second

inner flaps

31a and 31b and a connecting shaft 32 connecting the first and second

inner flaps

31a and 31 b. The first and second

inner folding plates

31a and 31b include inner folding plate bodies 311, a rotation shaft 313 is disposed on one longitudinal side of the outer ends of the inner folding plate bodies 311, the outer ends of the inner folding plate bodies 311 are accommodated in the groove structures 13 of the first and

second shells

10a and 10b, and an arc-shaped groove 312 is disposed on one side of the inner folding plate bodies 311 close to the connecting shaft 32. The connecting shaft 32 includes a shaft body 321, arc protrusions 323 disposed at two lateral ends of the shaft body 321, a groove 322 disposed on an outer side surface of the shaft body 321, and a fixing hole 324 formed by protruding from an inner side surface of the shaft body 321. When the first and second

inner folding plates

31a and 31b are folded, the end portions of the first and second

inner folding plates

31a and 31b near one side of the groove structure 13 are folded into the groove structure 13 to avoid the position. The rotating shaft 313 at the outer end of the first and second

inner folding plates

31a and 31b is limited on the outer folding hinge 40, a limiting mechanism 314 (shown in fig. 6) matched with the rotating shaft 313 is arranged on the outer folding hinge 40, and a hole structure with a certain length is arranged on the limiting mechanism 314 and matched with the rotating shaft 313.

Referring to fig. 6 and 7, the external folding hinge 40 includes a main shaft 43, first and second

external folding strips

42a and 42b located at two lateral sides of the main shaft 43, and first and second

external folding plates

41a and 41b located outside the first and second

external folding strips

42a and 42 b. The first and second

outer flaps

41a and 41b include an outer flap body 411 and a sliding plate 412 extending from the outer side of the outer flap body 411 to the inside of the sliding groove 142 to be engaged with the sliding rail groove 144. The sliding plate 412 is provided with a limiting hole 413, and the sliding plate 412 is provided with spring grooves 414 for accommodating the springs 145 at two longitudinal sides. A limiting column (not numbered) accommodated in the limiting hole 413 is arranged in the sliding groove 142, and the outer diameter of the limiting column is smaller than the inner diameter of the limiting hole 413, so that a movement gap exists between the limiting column and the limiting hole 413. The slide rail groove 144 is sleeved with a silica gel sleeve to reduce the sound caused by metal friction.

The first and second

outer folding strips

42a,42b have a width smaller than the width of the first and second

outer flaps

41a,41 b. The main shaft 43 includes a first sector 432 formed by protruding toward the inner folding hinge 30 at the inner side of both longitudinal ends, a first protrusion 434 formed by protruding outward from the middle of the outer side of the first sector 432, and first sector-shaped receiving portions 433 formed at both lateral sides of the first protrusion 434 and located at the longitudinal outer side of the first sector 432. The first and second

outer folding strips

42a,42b include a second sector-shaped receiving portion 422 formed at a position close to the first sector-shaped portion 432 inside both longitudinal ends, a second sector-shaped portion 423 located outside the second sector-shaped receiving portion 422, a second protrusion 424 formed at a longitudinal outer end of the second sector-shaped receiving portion 422, and a third sector-shaped receiving portion 425 located outside the second sector-shaped portion 423. The first and second

outer flaps

41a and 41b are provided with a fourth sector-shaped receiving portion 415 on a side close to the third sector-shaped receiving portion 425, and a sector-shaped side wall 416 formed outside the fourth sector-shaped receiving portion 415.

When folded, first segment 432 folds into second segment receptacle 422, second tab 424 folds into first segment receptacle 433, second segment 423 folds into fourth segment receptacle 415, and segment side wall 416 folds into third segment receptacle 425. Therefore, the longitudinal outer sides of the outer folding hinge 40 and the inner folding hinge 40 are closed, and the appearance is prevented from being influenced by gaps.

Referring to fig. 6, 7, and 12 to 14, the main shaft 43, the first and second

outer folding strips

42a and 42b, and the first and second

outer folding plates

41a and 41b have screw holes on their sides facing the inner folding hinge 30. The main shaft 43, the first and second

outer folding strips

42a and 42b and the first and second

outer folding plates

41a and 41b are hinged together by the

hinge assemblies

70, 80 and 90. The hinge assembly includes a first hinge assembly 70, a second hinge assembly 80, and a third hinge assembly 90. The main shaft 43 and the first and second

outer folding strips

42a,42b are hinged together by at least two sets of first hinge assemblies 70, each first hinge assembly 70 comprises a first hinge seat 71 fixed on the main shaft 43 and two second hinge seats 72 fixed on the first and second

outer folding strips

42a,42b, each first hinge seat 71 comprises a first fixed base 711 provided with a screw hole, a pair of first cams 712 extending from two longitudinal ends of the first fixed base 711 to transversely opposite directions, and a protruding shaft 713 protruding from two longitudinal ends of the first cams 712. The second hinge base 72 includes a second fixed base portion 721 provided with a screw hole, a second cam 722 formed by extending from one side of the second fixed base portion 721 toward one side of the main shaft 43, and an arc-shaped groove 723 formed in the second cam 722, and the protruding shaft 713 is limited by the arc-shaped groove 723 for rotation. The first and second

outer folding strips

42a,42b are hinged to the first and second

outer flaps

41a,41b by second hinge assemblies 80, the second hinge assemblies 80 including a first hinge seat 71 fixed to the first or second

outer flap

41a,41b and a second hinge seat 72 fixed to the first or second

outer folding strip

42a,42b, with the difference that the first hinge seat 71 is provided with only one first cam 712 cooperating with a second cam 722 of the second hinge seat 72. Third hinge subassembly 90 is used for strengthening the main shaft 43 with the wholeness of first, the outer strip 42a of second, 42b, third hinge subassembly 90 is including being fixed in third hinge seat 91 and two are fixed in on the main shaft 43 first, the outer strip 42a of second, the articulated seat 92 of fourth on the 42b, first hinge seat 91 is including the third fixed basal portion 911 that is equipped with the screw hole and certainly the protruding axle 912 that the vertical protrusion in third fixed basal portion 911 both sides formed, the articulated seat 92 of second is including the fourth fixed basal portion 921 that is equipped with the screw hole, certainly the third cam 922 that the horizontal both sides of fourth fixed basal portion 921 extended the formation and set up in third cam 922 with protruding axle 912 complex arc wall 923.

A first hinge base 71 is separately fixed on the first and second

outer folding plates

41a,41b, and an arc-shaped groove matched with the protruding shaft 713 is arranged on the first and second

inner folding plates

31a, 31b corresponding to the first hinge base 71 so that the first and second

outer folding plates

41a,41b and the first and second

inner folding plates

31a, 31b are hinged into a whole to rotate.

Referring to fig. 6 to 11, the balance control mechanism 50 includes a pair of first

rotating shafts

51a and 51b, a pair of second

rotating shafts

52a and 52b located between the first

rotating shafts

51a and 51b, an internal gear 55 for combining the pair of second

rotating shafts

52a and 52b, a pair of

external gears

58a and 58b fixed to the pair of first

rotating shafts

52a and 52b, respectively, and engaged with the internal gear 55, and two pairs of connecting

gears

54a and 54b for combining the first rotating shaft 51a (51b) and the second rotating shaft 52a (52b) into a whole.

The internal gear 55 includes a fixing hole (not numbered) sleeved outside the pair of second

rotating shafts

52a, 52b and a tooth structure (not numbered) disposed on both lateral sides of the internal gear 55. Each of the pair of

outer gears

58a and 58b includes an arm portion 581, a fixing hole 583 formed at one end of the arm portion 581 and fixedly fitted to the outside of the first

rotating shafts

51a and 51b, a tooth structure 584 formed outside the fixing hole 583 and engaged with the tooth structure of the inner gear 55, and a connecting shaft hole 582 formed at the other end of the arm portion 581. The inner gear 55 has lateral sides corresponding to the pair of

outer gears

58a,58b, and when the

outer gears

58a,58b rotate, the inner gear 55 is rotated and the pair of second

rotating shafts

52a, 52b and the pair of first

rotating shafts

51a, 51b are forced to move relatively in the vertical direction. The two pairs of the connecting

gears

54a,54b sandwich the internal gear 55 and the

external gears

58a,58b, respectively, in the longitudinal direction. The connecting

gears

54a and 54b include connecting

shaft holes

541 and 542 respectively sleeved outside the first rotating shaft 51a (51b) and the second rotating shaft 52a (52b) and a tooth structure 543 arranged at one side of the second

rotating shafts

52a and 52b, and the tooth structures 543 of the pair of connecting

gears

54a and 54b are engaged with each other. The coupling shaft holes 541, 542 of the coupling gears 54a,54b are rotatable about the first

rotating shafts

51a, 54b and the second

rotating shafts

52a, 52b, respectively.

The balance control mechanism 50 further includes a fixing block 56 fixed to the outside of the pair of second

rotating shafts

52a, 52b, and the fixing block 56 is fixed to the main shaft 43 of the outer folding hinge 40 by a screw. The two fixing blocks 56 are respectively located at two longitudinal ends of the two pairs of connecting

gears

54a,54 b. The balance control mechanism 50 is further provided with a plurality of groups of damping fins 57, wherein one group of damping fins 57 is connected to one pair of the second

rotating shafts

52a and 52b, and one group of damping fins 57 is connected to one pair of the first

rotating shafts

51a and 51b respectively corresponding to the second

rotating shafts

52a and 52 b. The balance control mechanism 50 further includes four limiting blocks 53 fixed to the first and second

outer folding strips

42a,42b of the outer folding hinge 40, and each limiting block 53 includes a limiting end 531 and a limiting groove 532 for the free end of the first

rotating shaft

51a, 51b to be sleeved in for limiting. In one embodiment, the limiting block 53 may be integrally formed with the first and second

outer folding strips

42a,42 b.

The damper mechanism 60 includes a first damper base 61 and a second damper base 62 fixed to the first and second

outer flaps

41a,41b, a shaft 615 slidably provided in the first damper base 61 and connected to the connecting shaft hole 582 of the outer gear 58a (58b), a slider 63 movable in the longitudinal direction with respect to the second damper base 62, and an elastic member 625 sandwiched between the slider 63 and the second damper base 62. An interference is generated between the slider 63 and the shaft 615. The first damper seat 61 includes a first rivet portion 611 fixed to the first or second

outer flap

41a,41b by a screw, two moving groove arms 612 formed to extend from the first rivet portion 611 toward the

outer gear

58a,58b, a moving space 613 formed between the moving groove arms 612, and a moving groove 614 opened in the moving groove arms 612 and having a certain length in the transverse direction. The shaft 615 moves within the moving slot 614, and the shaft 615 further includes a bulbous end 616 that extends longitudinally out of the moving slot 614. One end of the coupling shaft hole 582 of the

outer gears

58a,58b is located in the moving space 612 and is movable in the moving space 614 as the shaft 615 moves in the moving groove 614. The second damper seat 62 includes a second rivet portion 621 fixed to the first and second

outer flaps

41a and 41b, a pair of slide groove arms 622 formed to extend from the second rivet portion 621 toward the first damper seat 61, and a slide space 623 formed between the pair of slide groove arms 622. The inner side of the sliding slot arm 622 is provided with a track groove 624, the outer side of the sliding block 63 corresponding to the track groove 624 is provided with a sliding convex rail (not shown), the sliding convex rail slides in the track groove 624, and the elastic member 625 is located in the sliding space 623 and applies an elastic force to the sliding block 63. The slider 63 includes a slider main body 631, an extension portion 632 located outside the sliding space 623, and a bump 633 formed by extending from an end of the extension portion 632. Inclined surfaces 634 are arranged on two lateral sides of the bump 633, the inclined surfaces 634 are matched with the spherical end 616 of the shaft 615, when the spherical end 616 crosses the bump 633, the spherical end is in an unfolding state and a folding state respectively, and the hand feeling can be prompted to be unfolded in place or the folding is finished.

When folding, the first and

second shells

10a, 10b and the first and

second folding plates

20a, 20b rotate relatively, so that the arm portions 581 of the

external gears

58a,58b move around the shaft 615 to force the first

rotating shafts

51a, 51b to rotate, and the connecting

gears

54a,54b ensure that the first

rotating shafts

51a, 51b rotate uniformly on both sides, and the first

rotating shafts

51a, 51b move relatively with respect to the second

rotating shafts

52a, 52b and overlap at least partially in the vertical direction to realize folding. During this process, the spherical end 616 of the shaft 615 passes over the bump 633 to indicate that the folding is complete, and vice versa.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art to which the present application pertains. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. An external folding hinge is characterized by comprising a main shaft, a first external folding strip, a second external folding strip, a first external folding plate, a second external folding plate and a hinge assembly, wherein the first external folding strip and the second external folding strip are positioned on two transverse sides of the main shaft, the first external folding strip and the second external folding strip are positioned outside the first external folding strip and the second external folding strip, the hinge assembly is used for hinging the main shaft, the first external folding strip, the second external folding strip, the first external folding strip and the second external folding strip through the hinge assembly, a plurality of fan-shaped parts and a fan-shaped accommodating part are formed in the fan-shaped accommodating part in a closed longitudinal end part when the fan-shaped accommodating part is formed in the fan-shaped accommodating part when the fan-shaped accommodating part is unfolded;

the main shaft includes along the perpendicular in vertical both ends inboard the first sector that the main shaft surface protrusion formed, certainly outside protrusion formed in the middle of the first sector outside first convex part and formed at the horizontal both sides of first convex part just are located the first fan-shaped portion of holding in the vertical outside of first sector, first, the outer strip of folding of second include be close to in vertical both ends inboard the second fan-shaped portion of holding in the first sector position department formed, be located the second sector in the second fan-shaped portion of holding outside, be formed in the second convex part of the vertical outer end of second fan-shaped portion of holding and be located the third fan-shaped portion of holding in the second sector outside, first, the second folded plate is close to third fan-shaped portion one side is equipped with the fourth fan-shaped portion of holding and is formed in the fan-shaped lateral wall in the fourth fan-shaped portion of holding outside.

2. The external folding hinge of claim 1 wherein, when folded, said first segment is folded into said second segment, said second projection is folded into said first segment, said second segment is folded into said fourth segment, and said scalloped side walls are folded into said third segment.

3. The external folding hinge of claim 2 wherein said main shaft, first and second external folding strips are hingedly connected together by sets of first and third hinge assemblies, and said first and second external folding strips and said first and second external flaps are hingedly connected together by sets of second hinge assemblies.

4. The external folding hinge according to claim 3, wherein the first hinge assembly comprises a first hinge base fixed to the main shaft and two second hinge bases fixed to the first and second external folding strips, the first hinge base comprises a first fixed base portion having a screw hole, a pair of first cams extending from both longitudinal ends of the first fixed base portion toward laterally opposite directions, and a protruding shaft protruding from both longitudinal ends of the first cams, the second hinge assembly comprises a second fixed base portion having a screw hole, a second cam extending from one lateral side of the second fixed base portion toward one lateral side of the main shaft, and an arc-shaped groove opened in the second cam, and the protruding shaft is restricted to rotate in the arc-shaped groove.

5. The external folding hinge according to claim 4, wherein said second hinge member comprises a first hinge seat fixed to said first or second external flap and a second hinge seat fixed to said first or second external flap, said first hinge seat being provided with only a first cam cooperating with a second cam of said second hinge seat.

6. The external folding hinge according to claim 3, wherein the third hinge assembly comprises a third hinge seat fixed on the main shaft and two fourth hinge seats fixed on the first and second external folding strips, the first hinge seat comprises a third fixed base part provided with a screw hole and a protruding shaft formed by longitudinally protruding from two sides of the third fixed base part, the second hinge seat comprises a fourth fixed base part provided with a screw hole, a third cam formed by extending from two lateral sides of the fourth fixed base part and an arc-shaped groove formed in the third cam and matched with the protruding shaft.

7. A foldable display device, comprising the outer foldable hinge according to any one of claims 1 to 6, an inner foldable hinge disposed opposite to the outer foldable hinge, a balance control mechanism disposed between the outer foldable hinge and the inner foldable hinge and fixed to the main shaft, first and second foldable plates disposed at both lateral sides of the outer foldable hinge, first and second housings disposed at both lateral sides of the inner foldable hinge, and a flexible screen attached to the first and second foldable plates, wherein the flexible screen is not fixed to the outer foldable hinge by adhesion, the inner foldable hinge comprises a connecting shaft and first and second inner folded plates connected to the lateral sides of the connecting shaft, the inner foldable hinge comprises a connecting shaft and first and second inner folded plates disposed at both lateral sides of the connecting shaft and rotatably engaged with the connecting shaft, the longitudinal outer ends of the first and second inner folding plates are provided with rotating shafts, and the first and second outer folding plates correspond to the rotating shafts and are provided with limiting mechanisms for rotating the rotating shafts.

8. The foldable display device of claim 7, wherein the connecting shaft comprises a shaft body, arc-shaped protrusions at two lateral ends of the shaft body, a groove formed on an outer side surface of the shaft body, and a fixing hole formed by protruding from the inner side surface of the shaft body, the first and second inner folding plates comprise inner folding plates, a rotating shaft rotatably engaged with the first and second outer folding plates is disposed at one longitudinal side of an outer side end of the inner folding plates, an arc-shaped groove is disposed at one side of the inner folding plates close to the connecting shaft, and when folded, one end of the first and second inner folding plates located in the arc-shaped groove is received in the groove.

9. The foldable display device according to claim 7, wherein the balance control mechanism comprises a pair of first shafts, a pair of second shafts connected to each other via an internal gear, a connecting gear connecting adjacent ones of the first shafts to one of the second shafts, and an external gear fixed to the first shafts and engaged with the internal gear, the internal gear comprising a fixing hole for fixing a pair of the second shafts and a tooth structure located on a lateral outer side of the internal gear, the external gear comprising an arm, a fixing hole formed at a first end of the arm and fixed to an outer side of the first shaft, another tooth structure engaged with the tooth structure of the internal gear and located outside the first end of the arm, and a connecting shaft hole located at a second end of the arm and connected to the arm, the connecting gear comprising a connecting shaft hole respectively fitted to an outer side of the first shaft and the second shaft and a pair of the connecting shaft holes The connecting gear is fixed with the first rotating shaft and can rotate relative to the second rotating shaft, and the positions of the pair of second rotating shafts are fixed; the second ends of the arms are pivotally connected to the first and second outer flaps.