CN220748795U - Hinge - Google Patents

Abstract

A hinge comprises a fixed seat, two rotating units and two side support plates. The fixing seat is provided with two first grooves which are positioned on two sides of the central line and arc-shaped. The two rotating units are arranged on the two sides of the central line and are respectively arranged on the fixed seat, and the two rotating units can be converted between an unfolding state and a folding state relatively. Each rotating unit comprises a link member, a track sliding member, a rotating bracket and an intermediate sliding member. The intermediate sliding piece is arranged between the track sliding piece and the rotating bracket, so that the sliding stability between the track sliding piece and the rotating bracket can be maintained on the premise that the oblique sliding rail of the track sliding piece and the oblique sliding rail of the rotating bracket do not need to be additionally (prolonged), and the design of the track sliding piece and the rotating bracket can lead the whole hinge to have a reduced space and have the overall thinning characteristic.

Description

Hinge

Technical Field

The present utility model relates to a hinge, and more particularly to a hinge for connecting between two housings and adapted to support a flexible screen.

Background

There is a hinge adapted to connect two housings so that the housings can be opened and closed relatively. The hinge comprises a fixed seat and two rotating units. Each rotating unit comprises a connecting rod piece which can be arranged on the fixed seat in a sliding manner relative to the fixed seat in an arc track, a track sliding block which can be arranged on the connecting rod piece in a sliding manner relative to the connecting rod piece in an arc track, and a rotating bracket which can be arranged on the fixed seat in a pivoting manner. The track sliding block is slidably connected with the rotating support through an inclined sliding rail. However, in order to increase the sliding stability between the track slider and the rotating bracket, the size of the diagonal slide rail must be increased to maintain a certain contact amount between the track slider and the rotating bracket during the relative sliding process, but since the diagonal slide rail is increased in size and extends diagonally in the width direction and the thickness direction, the width and the thickness of the track slider and the rotating bracket are increased relatively, and the whole hinge size is increased and thickened in the transverse direction and the longitudinal direction, so that the whole hinge is extremely bulky and difficult to be reduced, and the thickness cannot be reduced.

Disclosure of Invention

It is an object of the present utility model to provide a hinge that ameliorates at least one of the problems of the prior art.

In some embodiments, the hinge is suitable for connecting two housings so that the housings can be opened and closed relatively, and the hinge comprises a fixed seat, two rotating units and two side support plates. The fixing seat is provided with two opposite long sides and two arc-shaped first channels which are positioned at two sides of a center line equidistant with the two long sides. The two rotating units are positioned on two sides of the central line, respectively correspond to the two first channels, are arranged on the fixed seat, can be converted between an unfolding state and a folding state relatively, and comprise a connecting rod piece, a track sliding piece, a rotating bracket and an intermediate sliding piece. The connecting rod piece is provided with a body, a first arc-shaped sliding rail connected with the body and slidably arranged in the corresponding first channel, and a second arc-shaped sliding rail connected with the body and extending in a direction away from the fixing seat, wherein the body is provided with a bearing surface. The track sliding piece is used for connecting one of the shells and is provided with a block body, a second channel which is formed in the block body and matched with the second arc-shaped sliding rail to form an arc shape, and an outer oblique sliding part which is formed in the block body, wherein the block body is provided with a supporting surface for the corresponding shell to be arranged. The rotary support is pivotally arranged on the fixed seat and is provided with a support body and an inner inclined guide part formed on the support body, wherein the inner inclined guide part is provided with an inner inclined sliding block, an inner limit rail formed on the inner inclined sliding block and a first guide inclined surface formed at the tail end of the inner inclined sliding block and adjacent to the inner limit rail. The intermediate sliding piece is arranged between the track sliding piece and the rotating bracket, the intermediate sliding piece is provided with an inner oblique sliding part matched with the inner oblique guiding part and an outer oblique guiding part matched with the outer oblique sliding part, the inner oblique sliding part is provided with an inner oblique sliding rail matched with the inner oblique sliding block, an inner limiting block adjacent to the inner oblique sliding rail and slidably limited in the inner limiting rail, and a second guiding inclined plane formed in the inner limiting block, and the first guiding inclined plane of the rotating bracket is used for being matched with the second guiding inclined plane so as to guide the inner limiting block to enter and be limited in the inner limiting rail. The rotating unit is in the process of switching from the unfolding state to the folding state, the track sliding piece slides relative to the second arc-shaped sliding rail of the link piece, and slides relative to the rotating bracket through the intermediate sliding piece so as to rotate relative to the fixing seat. The two side support plates are respectively arranged on the bearing surfaces of the connecting rod pieces of the two rotating units and are linked with the connecting rod pieces.

In the unfolded state, the two side support plates jointly cover the fixing seat; in the folded state, the two side support plates are opposite to each other, the distance between the two side support plates is wider at one side close to the fixing seat, and narrower at one side far away from the fixing seat, and the support surfaces of the track sliding pieces are parallel and opposite.

In some embodiments, the inner diagonal slide member further has a cantilever connected between the inner stopper and an inner wall surface defining the inner diagonal slide rail.

In some embodiments, the outer diagonal guide of the intermediate slide member has an outer diagonal slide member, and the outer diagonal slide member of the track slide member has an outer diagonal slide rail that mates with the outer diagonal slide member.

In some embodiments, the inner diagonal slide rail of the intermediate slide member is formed on the outer diagonal slide member.

In some embodiments, the outer oblique guiding portion of the intermediate sliding member further has an outer limit rail formed on the outer oblique sliding member, and the outer oblique sliding portion of the track sliding member further has an outer limit block protruding from an inner wall surface defining the outer oblique sliding rail and slidably located on the outer limit rail.

In some embodiments, the outer stopper is formed from a tail portion of the peg.

In some embodiments, the outer stopper is formed from the tail of a rivet.

In some aspects, the hinge further comprises a synchronization mechanism connected between the rotational supports of the rotational units, each rotational support of the rotational units further having teeth formed on the frame, the synchronization mechanism comprising a plurality of gears engaged between the teeth of the rotational supports.

According to the utility model, the intermediate sliding part arranged between the track sliding part and the rotary support can maintain the sliding stability between the track sliding part and the rotary support on the premise that the oblique sliding rail (the outer oblique sliding part) of the track sliding part and the oblique sliding rail (the inner oblique guiding part) of the rotary support are not required to be additionally arranged (prolonged), so that the design of the track sliding part and the rotary support can bring the space for reducing the whole hinge size, and the whole hinge has the characteristic of thinning. In addition, by the cooperation of the inner limit rail of the inner inclined guide portion of the rotating bracket and the inner limit block of the inner inclined slide portion of the intermediate slide, the relative position between the intermediate slide and the rotating bracket can be restricted, and the intermediate slide and the rotating bracket are prevented from being separated from each other. Furthermore, by the cooperation between the first guiding inclined plane of the rotary bracket and the second guiding inclined plane of the intermediate sliding member, the inner limiting block can be guided to enter and be limited on the inner limiting rail, so that the assembly between the inner inclined sliding part of the intermediate sliding member and the inner inclined guiding part of the rotary bracket is easier and more convenient.

Drawings

Other features and advantages of the utility model will be apparent from the following description of the embodiments with reference to the accompanying drawings, in which:

FIG. 1 is a perspective view of an embodiment of the hinge of the present utility model in an extended state;

FIG. 2 is an exploded perspective view of the embodiment of FIG. 1;

FIG. 3 is a further exploded perspective view of the embodiment of FIG. 1, with both side support plates and a center support plate not shown;

FIG. 4 is a cross-sectional view taken along section line IV-IV of FIG. 1;

FIG. 5 is a perspective view of a track bracket and a rotary unit thereof in an expanded state according to the embodiment;

FIG. 6 is an exploded perspective view of the track bracket and the rotating unit of FIG. 5;

FIG. 7 is a cross-sectional view of the track bracket and the rotating unit of FIG. 5;

FIG. 8 is a perspective view of the rotating unit of the embodiment in a retracted state;

FIG. 9 is a cross-sectional view taken along section line IX-IX of FIG. 8;

FIG. 10 is a perspective view of the track frame and the rotating unit in a retracted state according to the embodiment;

fig. 11 is a cross-sectional view of the track bracket and the rotating unit of fig. 10.

Detailed Description

Referring to fig. 1 to 4, an embodiment of the hinge 100 of the present utility model is adapted to connect two housings 200 such that the two housings 200 can be opened and closed relatively and is used to support a flexible screen 300. The hinge 100 comprises a fixed base 1, four rotating units 2, two side support plates 3, a central support plate 4, and two synchronizing mechanisms 5.

The fixing base 1 includes a fixing bracket 11, a housing (not shown) disposed on the fixing bracket 11 from below, and two rail brackets 12 fixed on the fixing bracket 11 from above. The fixed bracket 11 has two opposite long sides 111 and two guide structures 112. Defining a center line C between the two long sides 111, the center line C being parallel to the two long sides 111 and equidistant from the two long sides 111. The two guide structures 112 are arranged along the center line C, each guide structure 112 has an upper wall 112a defining a guide hole 112b, and a surrounding wall 112C extending downward from the periphery of the upper wall 112a, and the upper wall 112a and the surrounding wall 112C together define a receiving space 112d communicating with the guide hole 112 b. The two rail brackets 12 are arranged at intervals along the extending direction of the two long sides 111, and each rail bracket 12 is formed with two first grooves 121 which are positioned at two sides of the center line C and are arc-shaped.

The four rotating units 2 are paired in pairs, and each pair of rotating units 2 is arranged on the corresponding track bracket 12 of the fixing seat 1. The following description will be given by using one pair of rotation units 2 and one corresponding track bracket 12, where the one pair of rotation units 2 are located at two sides of the center line C and are correspondingly disposed in two first channels 121 of the corresponding track bracket 12 of the fixing base 1, so that the two housings 200 can be disposed respectively, and each pair of rotation units 2 can be relatively switched between an unfolded state (as shown in fig. 1) and a folded state (as shown in fig. 8). Each of the rotating units 2 includes a link member 21, a rail slider 22, a rotating bracket 23, and an intermediate slider 24.

Referring to fig. 3 and 5-7, the link member 21 has a main body 211, a first arc-shaped rail 212 connected to the main body 211 and slidably disposed in the corresponding first channel 121, and a second arc-shaped rail 213 connected to the main body 211 and extending away from the fixing base 1. The body 211 has a bearing surface 211a.

The track sliding member 22 has a block 221, a second channel 222 formed on the block 221 and configured to cooperate with the second arc-shaped rail 213 to form an arc shape, and an outer oblique sliding portion 223 formed on the block 221. The block 221 has a supporting surface 221a for the corresponding housing 200. The outer oblique sliding portion 223 of the track slider 22 has an outer oblique sliding rail 223a having a concave channel shape and being inclined with respect to the supporting surface 221a, and an outer stopper 223b protruding from an inner wall surface defining the outer oblique sliding rail 223 a. In the present embodiment, the outer stopper 223b is formed by a tail portion of a rivet 25 (bolt) provided on the rail slider 22, the rivet 25 is externally inserted into the rail slider 22, but in other embodiments, the outer stopper 223b may be integrally formed on the rail slider 22.

The rotating bracket 23 is pivotally arranged on the fixed seat 1. The rotating bracket 23 has a frame 231, an inner inclined guide portion 232 formed on the frame 231, and a tooth portion 233 formed on the frame 231. The frame 231 has a pivot 231a pivotally mounted on the track bracket 12 of the fixing base 1. The inner inclined guiding portion 232 has an inner inclined slider 232a, an inner limit rail 232b formed on the inner inclined slider 232a, and a first guiding inclined surface 232c formed at the end of the inner inclined slider 232a and adjacent to the inner limit rail 232b. The pivot 231a is pivoted to the fixing base 1, so that the rotating bracket 23 can rotate around the pivot 231a.

The intermediate slider 24 is provided between the rail slider 22 and the rotating bracket 23. The intermediate slider 24 has an inner diagonal slide portion 241 which mates with the inner diagonal guide portion 232, and an outer diagonal guide portion 242 which mates with the outer diagonal slide portion 223. The inner oblique sliding portion 241 has an inner oblique sliding rail 241a matching the inner oblique sliding block 232a, an inner stopper 241b adjacent to the inner oblique sliding rail 241a and slidably positioned in the inner stopper rail 232b, a cantilever 241c connected between the inner stopper 241b and an inner wall surface defining the inner oblique sliding rail 241a, and a second guiding inclined surface 241d formed on the inner stopper 241 b. The first guiding inclined surface 232c of the rotating bracket 23 is used to cooperate with the second guiding inclined surface 241d to guide the inner limiting block 241b into and limit the inner limiting rail 232b.

By the engagement of the inner stopper rail 232b of the inner diagonal guide portion 232 of the rotating bracket 23 with the inner stopper 241b of the inner diagonal slide portion 241 of the intermediate slide member 24, the relative position between the intermediate slide member 24 and the rotating bracket 23 can be restricted, avoiding the intermediate slide member 24 and the rotating bracket 23 from being detachable from each other. Furthermore, by the cooperation between the first guiding inclined surface 232c of the rotating bracket 23 and the second guiding inclined surface 241d of the intermediate sliding member 24, the inner limiting block 241b can be guided into and limited on the inner limiting rail 232b, so that the assembly between the inner inclined sliding portion 241 of the intermediate sliding member 24 and the inner inclined guiding portion 232 of the rotating bracket 23 is easier and more convenient. In addition, the elastic deformation of the cantilever 241c also enables the inner stopper 241b to more easily enter the inner stopper rail 232b during the assembly process.

The outer oblique guide portion 242 has an outer oblique slider 242a matching with the outer oblique slide rail 223a of the track slider 22, and an outer limit rail 242b formed on the outer oblique slider 242 a. The outer stopper 223b of the rail slider 22 is slidably positioned at the outer stopper rail 242b. By the engagement of the outer stopper 223b of the outer diagonal slide member 223 of the rail slide member 22 with the outer stopper rail 242b of the outer diagonal guide member 242 of the intermediate slide member 24, the relative position between the rail slide member 22 and the intermediate slide member 24 can be restricted, and the stopper can be formed to prevent the rail slide member 22 and the intermediate slide member 24 from being separated from each other. Further, since the rivet 25 of the outer stopper 223b is inserted into the rail slider 22 from the outside, the outer diagonal slide member 223 of the rail slider 22 and the outer diagonal guide member 242 of the intermediate slider 24 can be assembled more easily and conveniently.

In addition, the inner inclined slide rail 241a of the intermediate slide 24 is a channel structure formed on the outer inclined slide 242 a. Thus, in particular, in the unfolded state of the rotating unit 2, the intermediate slide 24 covers at least a partial portion of the rotating bracket 23, while the rail slide 22 is covered by at least a partial portion of the intermediate slide 24 together with at least a partial portion of the rotating bracket 23.

The intermediate slider 24 provided between the rail slider 22 and the rotating bracket 23 can maintain the sliding stability between the rail slider 22 and the rotating bracket 23 without lengthening the diagonal slide rail (the outer diagonal slide portion 223) of the rail slider 22 and the diagonal slide rail (the inner diagonal guide portion 232) of the rotating bracket 23.

In the process of switching the rotation unit 2 from the unfolded state to the folded state, the track sliding member 22 slides relative to the second arc-shaped sliding rail 213 of the link member 21, and slides relative to the rotating bracket 23 through the intermediate sliding member 24, so as to rotate relative to the fixing base 1.

Referring back to fig. 1 to 4, the two side support plates 3 are respectively disposed on the bearing surfaces 211a of the link members 21 of the corresponding groups of rotation units 2 and are linked with the link members 21 of the corresponding groups of rotation units 2, and in this embodiment, the two side support plates 3 are disposed on the two groups of rotation units 2 at the same time. Each side support plate 3 has a first plate body 31, a relief recess 32 formed in an inner side edge 311 of the first plate body 31, and a plurality of lifting columns 33 extending from the first plate body 31 toward the relief recess 32.

The central support plate 4 is movably arranged on the fixed seat 1. The central supporting plate 4 has a second plate 41, and two guide posts 42 connected to the second plate 41 and slidably penetrating the guide holes 112b of the two guide structures 112, respectively. Each guide post 42 is downward and slidably disposed through the corresponding guide hole 112b of the guide structure 112, and a fixing member (not shown) is disposed, for example, in a screw-locking manner, and a spring member (not shown) is interposed between the head of the fixing member and the upper wall 112a of the guide structure 112, and is configured to push the head of the fixing member downward, so as to drive the central support plate 4 to move downward relative to the fixing bracket 11.

Referring to fig. 2, 4, 5 and 7, in the unfolded state of the rotating unit 2, the inner edges 311 of the two side support plates 3 are adjacent to each other, the central support plate 4 is located at a filling position for filling the avoiding concave portions 32 of the two side support plates 3, and the two side support plates 3 and the central support plate 4 jointly cover the fixing seat 1. In addition, in this state, the support surface 221a of the rail slider 22 is parallel to the bearing surface 211a of the link member 21, and the two housings 200 provided on the support surface 221a of the rail slider 22 and the two side support plates 3 provided on the bearing surface 211a of the link member 21 also support the flexible screen 300 at the same height. In the unfolded state of the rotating unit 2, the lifting columns 33 of the two side support plates 3 support the central support plate 4 upwards, so that the height of the central support plate 4 is maintained to be equal to the height of the two side support plates 3, and the central support plate 4 can cooperatively support the flexible screen 300.

Referring to fig. 8 to 11, in the retracted state of the rotating unit 2, the side support plates 3 are opposite to each other and the distance between the two side support plates 3 is wider at each of the inner edges 311 (on the side closer to the fixing base 1), the distance between the two side support plates 3 is narrower away from each of the inner edges 311 (on the side farther from the fixing base 1), and the central support plate 4 is located at a biasing position that is biased toward the fixing base 1 relatively. The recess 32 at the inner edges 311 of the two side support plates 3 can avoid the flexible circuit board (not shown) or other components (not shown) arranged between the two housings 200 in this state, so as to avoid the flexible circuit board or other components from being damaged by pulling. In the folded state of the rotating unit 2, the support surfaces 221a of the rail sliders 22 are parallel and opposite to each other, and in detail, the side support plates 3 and the link members 21 move together, and the plate surfaces of the side support plates 3 are parallel to the bearing surfaces 211a of the link members 21 connected to each other.

In detail, each of the rotating units 2 slides along the corresponding first channel 121 during the transition from the unfolded state to the folded state of the link member 21. In the folded state of the rotating unit 2, the distance between the bearing surfaces 211a of the link member 21 is wider on the side close to the fixing base 1, and narrower on the side far from the fixing base 1, so that the distance between the bearing surfaces 211a is wider at the upper part and narrower at the lower part, and the distance between the two side support plates 3 is also wider at the upper part and narrower at the lower part, so that the distance between the two side support plates 3 is relatively wider at each inner edge 311. In addition, the central support plate 4, which is not supported by the lifting columns 33 of the two side support plates 3, is urged by the spring member to move downward to the biasing position biased toward the fixing base 1. The space between the two side support plates 3 and the central support plate 4 can accommodate the bent part of the flexible screen 300 in the shape of water drops. It should be noted that, during the transition from the folded state to the unfolded state, the central support plate 4 is lifted upward from the leaning position to the filling position by the lifting columns 33 (see fig. 4) of the two side support plates 3, after which the central support plate 4 is propped by the lifting columns 33 to maintain the filling position.

Referring to fig. 3, 8 and 9, in the process of transferring the rotation units 2 from the unfolded state to the folded state, the rail sliding member 22 slides relative to the second arc-shaped sliding rail 213, and slides relative to the rotating bracket 23 through the intermediate sliding member 24, so as to rotate relative to the fixing base 1. By the cooperation of the arc sliding and the oblique sliding of the rail sliding member 22, the supporting surface 221a of the rail sliding member 22 can be parallel and opposite to the supporting surface 221a of the other rail sliding member 22 when the rotating unit 2 is in the folded state, so that the housings 200 are stacked in parallel.

Referring to fig. 2 and 3, in the present embodiment, the two synchronizing mechanisms 5 are respectively disposed on the two track brackets 12 of the fixing base 1 and respectively correspond to the groups of the rotating units 2, and each synchronizing mechanism 5 is connected between a corresponding group of the rotating brackets 23 of the rotating unit 2. The synchronizing mechanism 5 includes a plurality of gears 51 (specifically, an even number of gears 51) engaged between the teeth 233 of the rotating bracket 23, and a torsion unit 52 connected to two gears 51 of the gears 51. The two synchronizing mechanisms 5 enable the rotation unit 2 to rotate synchronously and provide torsion.

In summary, according to the present utility model, the intermediate slider 24 disposed between the track slider 22 and the rotating bracket 23 can maintain the sliding stability between the track slider 22 and the rotating bracket 23 without adding (extending) the diagonal rail (the outer diagonal sliding portion 223) of the track slider 22 and the diagonal rail (the inner diagonal guiding portion 232) of the rotating bracket 23, so that the track slider 22 and the rotating bracket 23 can be designed to have a reduced (or reduced) space for the whole hinge 100, thereby providing a slim overall design. In addition, by the engagement of the inner stopper rail 232b of the inner diagonal guide portion 232 of the rotating bracket 23 and the inner stopper 241b of the inner diagonal slide portion 241 of the intermediate slide member 24, the relative position between the intermediate slide member 24 and the rotating bracket 23 can be restricted, and the intermediate slide member 24 and the rotating bracket 23 can be prevented from being separated from each other. Furthermore, by the cooperation between the first guiding inclined surface 232c of the rotating bracket 23 and the second guiding inclined surface 241d of the intermediate sliding member 24, the inner limiting block 241b can be guided into and limited on the inner limiting rail 232b, so that the assembly between the inner inclined sliding portion 241 of the intermediate sliding member 24 and the inner inclined guiding portion 232 of the rotating bracket 23 is easier and more convenient.

The foregoing is merely illustrative of the present utility model and is not intended to limit the scope of the utility model, which is defined by the appended claims and their equivalents.

Claims (8)

1. A hinge adapted to connect two housings so that the housings are relatively openable and closable, the hinge comprising:

the fixing seat is provided with two opposite long sides and two arc-shaped first channels which are positioned at two sides of a central line equidistant with the two long sides; and

Two rotating units which are positioned at two sides of the central line and respectively correspond to the two first channels and are arranged on the fixed seat and can be converted between an unfolding state and a folding state, wherein each rotating unit comprises

The connecting rod piece is provided with a body, a first arc-shaped sliding rail connected with the body and slidably arranged in the corresponding first channel, and a second arc-shaped sliding rail connected with the body and extending in a direction away from the fixed seat, the body is provided with a bearing surface,

the track sliding piece is used for connecting one of the shells and is provided with a block body, a second channel which is formed on the block body and matched with the second arc-shaped sliding rail to form an arc shape, and an outer oblique sliding part which is formed on the block body, the block body is provided with a supporting surface for the corresponding shell to be arranged,

the rotating bracket is pivotally arranged on the fixed seat and is provided with a bracket body and

an inner oblique guide part formed on the frame body, the inner oblique guide part is provided with an inner oblique sliding block, an inner limit rail formed on the inner oblique sliding block, a first guide inclined surface formed at the tail end of the inner oblique sliding block and adjacent to the inner limit rail, and

the intermediate sliding piece is arranged between the track sliding piece and the rotary bracket, the intermediate sliding piece is provided with an inner oblique sliding part matched with the inner oblique guiding part and an outer oblique guiding part matched with the outer oblique sliding part, the inner oblique sliding part is provided with an inner oblique sliding rail matched with the inner oblique sliding block, an inner limiting block adjacent to the inner oblique sliding rail and slidably limited in the inner limiting rail, and a second guiding inclined plane formed in the inner limiting block, the first guiding inclined plane of the rotary bracket is used for being matched with the second guiding inclined plane to guide the inner limiting block to enter and be limited in the inner limiting rail,

the rotating unit slides relative to the second arc-shaped sliding rail of the link member in the process of switching from the unfolding state to the folding state, and slides relative to the rotating bracket through the intermediate sliding member so as to rotate relative to the fixed seat; and

Two side support plates respectively arranged on the bearing surfaces of the connecting rod pieces of the two rotating units and linked with the connecting rod pieces,

in the unfolded state, the two side support plates jointly cover the fixing seat; in the folded state, the two side support plates are opposite to each other, the distance between the two side support plates is wider at one side close to the fixing seat, and narrower at one side far away from the fixing seat, and the support surfaces of the track sliding pieces are parallel and opposite.

2. The hinge according to claim 1, wherein: the inner inclined sliding part is also provided with a cantilever connected between the inner limiting block and the inner wall surface defining the inner inclined sliding rail.

3. The hinge according to claim 1, wherein: the outer oblique guide part of the intermediate sliding part is provided with an outer oblique sliding block, and the outer oblique sliding part of the track sliding part is provided with an outer oblique sliding rail matched with the outer oblique sliding block.

4. A hinge according to claim 3, wherein: the inner inclined sliding rail of the intermediate sliding piece is formed on the outer inclined sliding block.

5. A hinge according to claim 3, wherein: the outer oblique guiding part of the intermediate sliding part is also provided with an outer limit rail formed on the outer oblique sliding block, and the outer oblique sliding part of the track sliding part is also provided with an outer limit block which protrudes from the inner wall surface of the outer oblique sliding rail and is slidably limited on the outer limit rail.

6. The hinge according to claim 5, wherein: the outer limiting block is composed of the tail part of the bolt.

7. The hinge according to claim 5, wherein: the outer limiting block is formed by the tail part of the rivet.

8. The hinge according to claim 1, wherein: the hinge further comprises a synchronizing mechanism connected between the rotating brackets of the rotating units, each rotating bracket of the rotating units further comprises a tooth part formed on the frame body, and the synchronizing mechanism comprises a plurality of gears meshed between the tooth parts of the rotating brackets.