CN112112882B - Hidden split hinge - Google Patents

Abstract

The present invention is a concealed split hinge, wherein a first and second arc-shaped rails are arranged on an arc-shaped base body, and the first and second rotating parts of the first and second rotating parts are respectively limited in a manner of relative arc-shaped swing. , the second arc-shaped block; the first and second torsion units are relatively symmetrical and adjacent to the first side of the arc-shaped seat body, and one end of the relatively symmetrical first and second torsion units are respectively provided with first and second pivot holes, The first and second pivot holes are respectively connected to the first and second elongated openings, the outer circumferences of the first and second pivot holes are respectively provided with first and second tooth portions, and the first tooth portion is engaged with the second tooth portion , the first and second pivot holes are respectively connected to the first and second shafts of the first side; the first and second pivot shafts respectively pass through the first and second pivot holes at the other ends of the first and second torsion units and the first and second guide grooves of the first and second rotating parts.

Description

Hidden split hinge

technical field

The present invention relates to a hinge, especially a hidden split hinge of a foldable electronic device.

Background technique

Conventional foldable electronic devices, such as the monitor and the base of a notebook computer, are mainly connected to the sides of the display and the base respectively through a single-axis hinge to form a pivot, so that the display can be flipped up or closed relative to the base. In addition to the traditional notebook computers, especially for the existing dual-touch screen computers, the current design direction of the folding device is mainly to improve the shortcomings of the dual-touch screen computers, so that the dual-screen computers can be During the opening and closing process, they can approach each other and reduce the gap between them, so as to avoid the internal structure of the hinge or pivot joint from being exposed.

Among them, as shown in the "Hinge and Folding Electronic Device Having the Hinges" Patent No. CN207018340U of the Utility Model Announcement of the People's Republic of China (hereinafter referred to as the previous case 1), the folding electronic device mainly includes two bodies and a hinge. The hinge includes a base frame, a transmission assembly and two brackets. The base frame is provided with two guide grooves, and the two guide grooves are arranged in opposite directions along the front-rear direction and are spaced apart from each other. The transmission assembly is arranged on the base frame and partially located in the two guide grooves. The two brackets are arranged in opposite directions along the front and rear directions, and each bracket includes an arc-shaped frame body slidably connected to the corresponding guide groove and connected to the transmission assembly, and a bracket body protruding from the arc-shaped frame body and located outside the base frame . The two brackets are rotatable relative to the base frame around the rotation axis and can rotate synchronously in opposite directions through the transmission assembly.

In addition, as shown in the Patent of "A New Type of Reversible Combination Structure" of Utility Model No. CN205353861U of the People's Republic of China (hereinafter referred to as the previous case 2), it includes a bending part, a first torsion mechanism, a second torsion mechanism, a first gear, a first Two gears, a first movable plate and a second movable plate, the first gear and the second gear are fixed inside the bending part, and the first torsion mechanism and the second torsion mechanism are arranged in the bending part. One side of the folding part; the first gear is drivingly connected to the second gear; the first movable plate is drivingly connected to the first gear, the second gear is drivingly connected to the second movable plate; the first movable plate is drivingly connected to the first A torsion mechanism, the second movable plate is drivingly connected to the second torsion mechanism. Through the above structure, the combined component can be simplified, the friction coefficient is small, and it is easy to rotate.

The two brackets of the former case 1 are mainly engaged with the two transmission gear sets through the two inner gear rings respectively, and the two brackets are turned relative to each other through the reverse rotation of the transmission gear set, so as to generate a lifting or closing action; The first movable plate and the second movable plate of the former case 2 are also provided with circular arc tooth patterns, and respectively generate the same rotation effect as the former case 1 through the gears that engage with each other. However, setting internal teeth or tooth patterns on the arc-shaped plate will not only increase the thickness of the plate, but also increase the space for accommodating the plate, thereby increasing the overall volume of the hinge, and will also require precision in manufacturing. The improvement of the degree of production increases the cost of production operations.

SUMMARY OF THE INVENTION

One object of the present invention is to provide a concealed split hinge, which can simplify the inner gear ring of the front case 1 and the movable plate of the front case 2, remove the internal teeth or tooth pattern structure, and reduce the thickness of each arc block by reducing the thickness of each arc block. And the size of the arc-shaped seat corresponding to the connection, so as to reduce the overall thickness to facilitate the design, to meet the market demand for light and thin overall volume to promote sales; and there is no need to worry about the production precision of the internal teeth or tooth patterns, and the teeth are combined with each other. The components of the structure are reduced to reduce production costs.

In order to achieve the purpose of the above invention, the concealed split hinge provided by the present invention includes an arc-shaped base, a first rotating member, a second rotating member, a first torsion unit and a second torsion unit. Wherein, the arc-shaped seat body has a first side surface and a second side surface opposite to each other, a first arc-shaped track and a second arc-shaped track spaced and juxtaposed between the first side surface and the second side surface, the first arc-shaped track and The opening direction of the second arc-shaped track is the same, and the first side has a first axis and a second axis; the first rotating member includes a first connecting part and a first arc-shaped block, and the first connecting part is connected to a first bracket , the first connecting part has an elongated first guide groove, and the first arc-shaped block is limited in the first arc-shaped track in a relatively arc-shaped swing; the second rotating part includes a second connecting part and a first arc-shaped block. Two arc-shaped blocks, the second connecting portion is connected to a second bracket, the second connecting portion has an elongated second guide groove, and the second arc-shaped block is limited to the second arc-shaped track in a relatively arc-shaped swinging manner; The first torsion unit is adjacent to the first side surface of the arc-shaped base, and both ends of the first torsion unit are respectively provided with a first pivot hole and a first pivot hole, and the first pivot hole communicates with a first elongated hole , the outer periphery of the first pivot hole is provided with a first tooth portion, the first pivot hole is pivotally connected to the first shaft, and a first pivot shaft passes through the first pivot hole and the elongated first guide groove of the first connecting portion ; And the second torsion unit is symmetrical with the first torsion unit, and is adjacent to the first side of the arc-shaped seat body, the two ends of the second torsion unit are respectively provided with a second pivot hole and a second pivot hole, the second The pivot hole communicates with a second elongated hole, a second tooth portion is arranged around the outer periphery of the second pivot hole, the second tooth portion engages with the first tooth portion, the second pivot hole is connected to the second shaft, and a second The pivot shaft passes through the second pivot hole and the elongated second guide groove of the second connecting portion.

When implemented, the arc-shaped base body includes a first side plate, a middle arc block and a second side plate connected in sequence, and the middle arc block has a first arc-shaped track and a second arc-shaped track that are juxtaposed at intervals.

During implementation, the middle arc block includes an arc body and a cover plate, the arc body has an arc surface, the first arc track and the second arc track are two grooves formed on the arc surface, the cover plate covers Merge joins on curved faces.

During implementation, the first shaft is located at one end of a first shaft rod, the first shaft rod passes through the middle arc block, and the middle section of the first shaft rod is positioned in the middle arc block in a static manner.

During implementation, the first shaft rod has at least one first stopper, and at least one side of both sides of the middle arc block has a limit groove for limiting the at least one first stopper so that the The middle segment is positioned in the middle arc block in a stationary manner.

During implementation, a third axis and a fourth axis are provided on the second side of the arc-shaped seat, the third torsion unit is adjacent to the second side of the arc-shaped seat, and both ends of the third torsion unit are respectively provided with third pivot holes and a third pivot hole, the third pivot hole communicates with the third elongated opening, the outer periphery of the third pivot hole is provided with a third tooth portion, the third pivot hole is pivotally connected to the third shaft, and the first pivot shaft passes through the third pivot hole. Three pivot holes; the fourth torsion unit is symmetrical with the third torsion unit, and is adjacent to the second side of the arc-shaped seat body, the two ends of the fourth torsion unit are respectively provided with a fourth pivot hole and a fourth pivot hole, the third The four pivot holes communicate with the fourth elongated opening, the fourth pivot hole is provided with a fourth tooth portion around the outer periphery, the fourth tooth portion is engaged with the third tooth portion, the fourth pivot hole is connected to the fourth shaft, and the second pivot shaft through the fourth pivot hole.

When implemented, the arc-shaped seat includes a first side plate, a middle arc block and a second side plate connected in sequence, and the middle arc block has the first arc track and the second arc that are spaced and juxtaposed. track.

During implementation, the second shaft and the fourth shaft are respectively located at both ends of a second shaft, the second shaft passes through the middle arc block, and the middle section of the second shaft is positioned at the middle arc in a static manner. within the block.

During implementation, the second shaft rod has at least one second stopper, and at least one side of both sides of the middle arc block has a limit groove for limiting the at least one second stopper so that the The middle segment is positioned in the middle arc block in a stationary manner.

When implemented, the third torsion unit includes a plurality of laterally stacked third plates, and the fourth torsion unit includes a plurality of laterally stacked fourth plates.

When implemented, the first torsion unit includes a plurality of laterally stacked first plates, and the second torsion unit includes a plurality of laterally stacked second plates.

During implementation, the second rotating member and the first rotating member are correspondingly disposed on opposite side edges of the arc-shaped base body, so that the second arc-shaped block is opposite to the opening of the first arc-shaped block.

Description of drawings

The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

FIG. 1 is an exploded view of the components of the preferred embodiment of the present invention;

Fig. 2 is the three-dimensional appearance schematic diagram of the preferred embodiment of the present invention;

Fig. 3 is A-A' sectional view of Fig. 2;

Fig. 4 is the B-B' sectional view of Fig. 2;

FIG. 5 is a schematic diagram of the three-dimensional appearance of the preferred embodiment of the present invention when it is half-deployed;

6 is a schematic cross-sectional view of the preferred embodiment of the present invention when it is half-deployed;

FIG. 7 is a schematic diagram of the three-dimensional appearance of the preferred embodiment of the present invention when it is fully unfolded;

8 is a schematic cross-sectional view of the preferred embodiment of the present invention when it is fully unfolded.

Description of reference numerals

1. Hidden split hinge 2. Arc seat

21. The first side plate 211. The first side

22. Middle arc block 221. Arc body

222, cover plate 223, arc surface

224, the first arc track 225, the second arc track

226, limit groove 23, second side plate

231. The second side 3. The first rotating part

31. The first connecting part 311. The first guide groove

32. The first arc block 4. The second rotating part

41. The second connecting part 411. The second guide groove

42. The second arc block 5. The first torque unit

51. The first plate 52. The first pivot hole

53. The first pivot hole 54. The first elongated hole

55. The first tooth part 6. The second torque unit

61. Second plate 62. Second pivot hole

63, the second pivot hole 64, the second elongated hole

65. The second tooth part 7. The third torque unit

71. The third plate 72. The third pivot hole

73. The third pivot hole 74. The third elongated hole

75. The third tooth part 8. The fourth torque unit

81. Fourth plate 82. Fourth pivot hole

83. Fourth pivot hole 84. Fourth elongated hole

85. Fourth tooth 91. First bracket

92. Second bracket 93. First pivot

94, the second pivot 95, the first shaft

951, the first stop 952, the first shaft

953, the third axis 96, the second axis

961, second stopper 962, second shaft

963. Fourth axis.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Many specific details are set forth in the following description to facilitate a full understanding of the present invention, but the present invention can also be implemented in other ways different from those described herein, and those skilled in the art can do so without departing from the connotation of the present invention. Similar promotion, therefore, the present invention is not limited by the specific embodiments disclosed below.

Please refer to FIG. 1 to FIG. 4 , which is a preferred embodiment of the concealed split hinge 1 of the present invention, comprising an arc-shaped base 2 , a first rotating member 3 , a second rotating member 4 , and a first rotating member 4 . A torsion unit 5 , a second torsion unit 6 , a third torsion unit 7 and a fourth torsion unit 8 . The first connecting portion 31 of the first rotating member 3 is connected to the side of the first bracket 91 of the display of an electronic device, and the second connecting portion 41 of the second rotating member 4 is connected to the second bracket 92 of the base of the electronic device. On the side, when the first rotating member 3 and the second rotating member 4 rotate relative to each other with the arc-shaped base body 2 as the axis, the display and the base can be turned over relative to each other. During implementation, the first connection of the first rotating member 3 The part 31 and the second connecting part 41 of the second rotating member 4 can also be respectively connected to two side edges of the brackets of the dual touch screen computer.

The arc-shaped base 2 includes a first side plate 21 , a middle arc block 22 and a second side plate 23 . The first side plate 21 , the middle arc block 22 and the second side plate 23 are connected laterally in sequence. The outer side of the first side plate 21 is used as the first side 211, the outer side of the second side plate 23 is used as the second side 231, the first side 211 and the second side 231 are opposite to the two sides of the arc-shaped seat body 2; The arc block 22 includes an arc-shaped body 221 and a cover plate 222. The arc-shaped body 221 has an arc-shaped surface 223. The arc-shaped surface 223 has two arc-shaped grooves that are juxtaposed at intervals and have sub-arc-shaped cross-sections. The arc-shaped grooves are respectively used as the first arc-shaped track 224 and the second arc-shaped track 225, the left and right sides of the arc-shaped body 221 are respectively provided with a limit groove 226; and the cover plate 222 is a curved and arc-shaped surface 223 The same arc-shaped plate, the cover plate 222 is covered and connected to the arc-shaped surface 223 , so that the opening directions of the first arc-shaped rail 224 and the second arc-shaped rail 225 are the same.

The first rotating member 3 includes a flat plate-shaped first connecting portion 31 and a first arc-shaped block 32 extending oppositely from one end of the first connecting portion 31. The first connecting portion 31 has a length extending through the left and right sides. The first arc-shaped block 32 is an arc-shaped plate with an inferior arcuate cross-section. The first arc-shaped block 32 is inserted into and limited to the first arc-shaped track 224, so that the first arc-shaped block 32 can be Swing arcuately within the first arcuate track 224 .

The second rotating member 4 and the first rotating member 3 are disposed on the front and rear opposite side edges of the arc-shaped base 2 corresponding to the first rotating member 3. The second rotating member 4 includes a flat plate-shaped second connecting portion 41 and a second connecting portion One end of the 41 is a second arc-shaped block 42 extending oppositely, and the second connecting portion 41 has an elongated second guide groove 411 penetrating the left and right sides. The second arc-shaped block 42 is an arc-shaped plate with an inferior arcuate cross-section. The second arc-shaped block 42 is inserted into and limited to the second arc-shaped rail 225 so that the openings between the second arc-shaped block 42 and the first arc-shaped block 32 Oppositely, the second arc-shaped block 42 can swing arc-shaped in the second arc-shaped track 225 .

The first torsion unit 5 is adjacent to the first side surface 211 of the first side plate 21 of the arc-shaped base 2 . The first torsion unit 5 is formed by stacking a plurality of first plates 51 horizontally. Both ends of the first torsion unit 5 A first pivot hole 52 and a first pivot hole 53 are respectively provided, the first pivot hole 52 communicates with a first elongated hole 54 , and a first tooth portion 55 is arranged around the outer periphery of the first pivot hole 52 . The second torsion unit 6 is formed by stacking a plurality of second plates 61 laterally. The second torsion unit 6 is symmetrical to the first torsion unit 5 and is adjacent to the first torsion unit 5 of the arc-shaped base 2 at the same time. On the side 211 , two ends of the second torsion unit 6 are respectively provided with a second pivot hole 62 and a second pivot hole 63 . The second pivot hole 62 communicates with a second elongated hole 64 . A second tooth portion 65 is provided around the outer periphery, and the second tooth portion 65 engages with the first tooth portion 55 .

The third torsion unit 7 is symmetrical to the fourth torsion unit 8 and is adjacent to the second side surface 231 of the second side plate 23 of the arc-shaped base 2 , wherein the third torsion unit 7 also includes a plurality of laterally stacked first Three plates 71, two ends of the third torsion unit 7 are respectively provided with a third pivot hole 72 and a third pivot hole 73, the third pivot hole 72 communicates with a third elongated hole 74, and the third pivot hole The outer periphery of 72 is provided with a third tooth portion 75 . The fourth torsion unit 8 also includes a plurality of horizontally stacked fourth plates 81 . Both ends of the fourth torsion unit 8 are respectively provided with a fourth pivot hole 82 and a fourth pivot hole 83 . The fourth pivot hole 82 communicates with a fourth elongated opening 84 , and a fourth tooth 85 is provided around the outer periphery of the fourth pivot hole 82 , and the fourth tooth 85 engages with the third tooth 75 .

A first pivot shaft 93 sequentially passes through the first pivot hole 53 of the first torsion unit 5 , the elongated first guide groove 311 of the first connecting portion 31 and the third pivot hole 73 of the third torsion unit 7 , Thereby, the first pivot shaft 93 is pivotally connected to the first pivot hole 53 and the third pivot hole 73 , and the first pivot shaft 93 can move in the elongated first guide groove 311 . A second pivot shaft 94 passes through the second pivot hole 63 of the second torsion unit 6 , the elongated second guide groove 411 of the second connecting portion 41 and the fourth pivot hole 83 of the fourth torsion unit 8 in sequence, Thereby, the second pivot shaft 94 is pivotally connected to the second pivot hole 63 and the fourth pivot hole 83 , and the second pivot shaft 94 can move within the elongated second guide groove 411 . A first shaft 95 has a first stop 951 , two ends of the first shaft 95 respectively have a first shaft 952 and a third shaft 953 , the first shaft 952 is connected to the first pivot of the first torsion unit 5 . The hole 52, the third shaft 953 is connected to the third pivot hole 72 of the third torsion unit 7, the middle section of the first shaft 95 passes through the middle arc block 22, and is limited to the arc body 221 by the first stopper 951 The first shaft 95 is positioned in the middle arc block 22 in a static manner in the limiting groove 226 of the first shaft. A second shaft 96 has a second stopper 961 , both ends of the second shaft 96 have a second shaft 962 and a fourth shaft 963 respectively, and the second shaft 962 is connected to the second shaft of the second torsion unit 6 . The pivot hole 62, the fourth shaft 963 is pivotally connected to the fourth pivot hole 82 of the fourth torsion unit 8, the middle section of the second shaft rod 96 passes through the middle arc block 22, and is limited to the arc body by the second stopper 961 In the limiting groove 226 of 221, the second shaft 96 is positioned in the middle arc block 22 in a static manner.

In implementation, the first shaft 952 and the second shaft 962 can also be directly extended laterally from the first side surface 311 of the arc-shaped base body 22 to be axially connected to the first pivot hole 52 and the second torsion force of the first torsion unit 5 respectively. The second pivot hole 62 of the unit 6; the third shaft 953 and the fourth shaft 963 can also be directly extended laterally from the second side surface 231 of the arc-shaped base 22 to be respectively connected to the third pivot of the third torsion unit 7 The hole 72 and the fourth pivot hole 82 of the fourth torsion unit 8 . The first stopper portion 951 of the first shaft rod 95 and the second stopper portion 961 of the second shaft rod 96 may also be provided with two respectively, so as to limit the limiting grooves 226 on both sides of the arc-shaped body 221 respectively. Inside.

Thereby, as shown in FIG. 1 and FIG. 5 to FIG. 8 , during the process of flipping the monitor relative to the base or the two side-by-side brackets of the dual-touch screen computer to a closed or fully extended angle of about 180 degrees, the first The first tooth portion 55 of a torsion unit 5 meshes with the second tooth portion 65 of the second torsion unit 6 , and the third tooth portion 75 of the third torsion unit 7 meshes with the fourth tooth portion 85 of the fourth torsion unit 8 . Synchronous linkage; let the first pivot shaft 93 and the second pivot shaft 94 move in the elongated first guide slot 311 and the elongated second guide slot 411 respectively; and then pass through the first pivot hole 52 of the first torsion unit 5 and the Synchronous rotational friction between the third pivot hole 72 of the third torsion unit 7 and the first shaft 952 and the third shaft 953 of the first shaft 95 to generate torsion force, and the second pivot hole 62 of the second torsion unit 6 And the synchronous rotational friction between the fourth pivot hole 82 of the fourth torsion unit 8 and the second shaft 962 and the fourth shaft 963 of the second shaft 96 respectively to generate the torsion force, so that the torsion force can be stably maintained at each rotation angle Within a preset range, the monitor and the base or the two parallel brackets of the dual-touch screen computer can rotate relatively stably, and can freely stop at a certain angle when rotating.

Therefore, the present invention has the following advantages:

1. The first torsion unit and the second torsion unit of the present invention are composed of a plurality of first plates and a plurality of second plates, respectively, and the overall thickness can be increased or decreased depending on the specifications, and then the torsion force can be adjusted. Therefore, it not only helps to reduce the volume without occupying space, but also facilitates the overall design of the electronic device to meet the market demand of light and thin overall volume, and can easily adjust the structural strength. Moreover, the first and second torsion units are moved to the outside of the whole body. In addition to facilitating the adjustment of the torsion force, they are also used as "connecting rods" to form linkages. The two ends of the first and second torsion units are respectively provided with " Pivot hole" and "pivot hole", one end of the "pivot hole" is connected with a long opening, which can allow the "shaft" to have the effect of elastic adjustment when passing through. "Teeth", in addition to the effect of synchronizing motion during relative flipping, can also assist each "arc block" to provide support.

2. The present invention can selectively use the third torsion unit and the fourth torsion unit, so that the third and fourth torsion units are respectively symmetrical with the first torsion unit and the second torsion unit, thereby providing frictional torque synchronously, and can To share the load, these four torsion units can not only be composed of multiple plates, but also can be manufactured in one piece, which can be implemented according to the actual situation and increase the flexibility of use.

3. Each "connecting part" of the present invention is provided with "long guide grooves" respectively, and the opposite ends of each "torsion unit" respectively pass through each "long guide groove" with a "pivot", and can follow each " Long guide slot" slips. The "first shaft rod" and the "second shaft rod" are respectively provided with "stop parts". After passing through the "middle arc block", each "stop part" will be limited to the "groove" of the middle arc block. Inside, the effect of non-rotation is formed, so that the "first and second torsion units" can respectively form rotational friction on the "biaxial rod".

4. The present invention can simplify the structure of the movable plate, so as to reduce the overall thickness by reducing the thickness of each arc block and the size of the correspondingly connected arc seat, thereby reducing the overall thickness to facilitate the design, and achieving the market demand for light and thin overall volume to promote sales; and components can be reduced to reduce production costs.

The above descriptions are only preferred embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Claims (3)

1. a concealed split hinge, is characterized in that, comprises: An arc-shaped base includes a first side plate, a middle arc block and a second side plate which are connected in sequence and transversely; the outer side of the first side plate is a first side, and the second side plate is The outer side is a second side, and the first side and the second side are opposite to the two sides of the arc-shaped seat; the middle arc block includes an arc-shaped body and a cover plate, and the arc-shaped body has an arc-shaped body. There are two arc-shaped grooves on the arc-shaped surface, which are juxtaposed at intervals and whose cross-sections are respectively inferior arcuate. The two arc-shaped grooves are respectively used as a first arc-shaped track and a second arc-shaped track. The left and right sides of the body are respectively provided with a limit groove; the cover plate is an arc-shaped plate with the same curvature as the arc-shaped surface, and is covered and connected to the arc-shaped surface, so that the first arc-shaped The opening direction of the track and the second arc-shaped track is the same, the first side has a first axis and a second axis; the second side has a third axis and a fourth axis; the first axis and the third axis The shaft is located at both ends of a first shaft, the first shaft has at least one first stop; the second shaft and the fourth shaft are respectively located at both ends of a second shaft, the second shaft The rod has at least one second stop part; the first shaft rod and the second shaft rod respectively pass through the middle arc block, so that the at least one first stop part and the at least one second stop part are limited to the The limiting groove on at least one side of the two sides of the arc-shaped body of the middle arc block, and the middle section of the first shaft rod and the middle section of the second shaft rod are positioned at the middle section of the middle arc block in a static manner. within the arc; A first rotating member includes a flat-shaped first connecting portion and a first arc-shaped block extending oppositely from one end of the first connecting portion, the first connecting portion is connected to a first bracket, and the first connecting portion There is an elongated first guide groove running through the left and right sides. The first arc-shaped block is an arc-shaped plate with an inferior arcuate cross-section, and is inserted and limited in the first arc-shaped track. The first arc-shaped block is The relative arc swing is limited to the first arc track; A second rotating member, corresponding to the first rotating member, is disposed on the opposite side edges of the front and rear of the arc-shaped base, the second rotating member includes a flat plate-shaped second connecting portion and a second connecting portion formed by the second connecting portion. A second arc-shaped block extending in the opposite direction from one end, the second connecting part is connected to a second bracket, the second connecting part has a long second guide groove running through the left and right sides, and the second arc-shaped block is An arc-shaped plate with an inferior arcuate cross-section is inserted into and limited to the second arc-shaped track, so that the second arc-shaped block is opposite to the opening of the first arc-shaped block, and the second arc-shaped block has a relatively arc-shaped block. The way of swing is limited to the second arc track; A first torsion unit, adjacent to the first side surface of the arc-shaped base, two ends of the first torsion unit are respectively provided with a first pivot hole and a first pivot hole, the first pivot hole communicates with a first pivot hole. an elongated hole, a first tooth is disposed around the first pivot hole, the first pivot hole is pivotally connected to the first shaft, and a first pivot shaft passes through the first pivot hole and the first pivot hole The elongated first guide groove of a connecting portion; A second torsion unit, symmetrical with the first torsion unit, and adjacent to the first side surface of the arc-shaped base, both ends of the second torsion unit are respectively provided with a second pivot hole and a second pivot connection The second pivot hole communicates with a second elongated hole, the outer periphery of the second pivot hole is provided with a second tooth portion, the second tooth portion engages with the first tooth portion, and the second pivot hole The second shaft is pivotally connected, and a second pivot shaft passes through the second pivot hole and the elongated second guide groove of the second connecting portion; a third torsion unit, which is adjacent to the second side of the arc-shaped base, two ends of the third torsion unit are respectively provided with a third pivot hole and a third pivot hole, the third pivot hole communicates with a first Three elongated openings, a third tooth portion is provided around the third pivot hole, the third pivot hole is pivotally connected to the third shaft, and the first pivot shaft passes through the third pivot hole; and a fourth torsion unit, which is symmetrical with the third torsion unit and is adjacent to the second side of the arc-shaped base, and has a fourth pivot hole and a fourth pivot hole at both ends of the fourth torsion unit respectively , the fourth pivot hole communicates with a fourth elongated hole, the outer periphery of the fourth pivot hole is provided with a fourth tooth portion, the fourth tooth portion is engaged with the third tooth portion, and the fourth pivot hole is pivotally connected the fourth shaft, the second pivot shaft passes through the fourth pivot hole; Wherein, the first tooth portion of the first torsion unit is engaged with the second tooth portion of the second torsion unit, and the third tooth portion of the third torsion unit is engaged with the fourth tooth portion of the fourth torsion unit. Synchronous linkage; the first pivot shaft and the second pivot shaft move in the elongated first guide slot and the elongated second guide slot respectively, and then pass through the first pivot hole of the first torsion unit and the first pivot hole of the first torsion unit. The synchronous rotational friction between the third pivot hole of the three torsion units and the first shaft and the third shaft of the first shaft respectively generates torsion force, and passes through the second pivot hole of the second torsion unit and the fourth torsion force The synchronous rotation friction between the fourth pivot hole of the unit and the second axis and the fourth axis of the second shaft rod respectively to generate torsion force, and the arc-shaped seat is the axis of the first rotating member and the second rotating member respectively. During relative rotation, the torsion force is stably maintained within a preset range at each rotation angle, so that the juxtaposed first bracket and second bracket can be rotated relatively stably, so that the second arc-shaped block and the first arc-shaped block can be rotated relatively stably. The openings of the blocks face each other and are free to stop at an angle as they turn. 2 . The concealed split hinge of claim 1 , wherein the third torsion unit comprises a plurality of laterally stacked third plates, and the fourth torsion unit comprises a plurality of laterally stacked fourth plates . 3 . The concealed split hinge of claim 1 , wherein the first torsion unit comprises a plurality of laterally stacked first plates, and the second torsion unit comprises a plurality of laterally stacked second plates. 4 . .

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