Dual-axis synchronous hinge

Abstract

A dual-axis synchronous hinge includes a base unit and two rotating shaft units. The base unit includes a base and a protective cover. The base has a first surface, two rotating grooves recessed in the first surface, and two rotating shaft slots penetrating therethrough. The protective cover has a base wall and two protruding columns. Each rotating shaft unit includes a rotating shaft rotatably inserted into the rotating shaft slot, a first rotating member fixedly sleeved on the rotating shaft, a second rotating member connected to the first rotating member, and a pivot plate fixedly sleeved on the rotating shaft. The first rotating member has a body, a linkage column movably accommodated in the rotating groove. The second rotating member has a pivot hole for accommodating the protruding column and a linkage hole for accommodating the linkage column. The rotating shaft unit can be moved between an initial position and a first unfolded position, and the rotating shaft rotates in conjunction with the linkage column of the first rotating member, thereby driving the second rotating member to pivot and drive the rotating shaft to move from the outer end of the rotating shaft slot to the inner end, so that the distance between the two bodies driven by the rotating shaft unit can also be shortened accordingly.

Description

Technical Field

[0001] The invention relates to a hinge, in particular to a double-axis synchronous hinge. Background Art

[0002] When a conventional dual-axis hinge is provided in a foldable electronic device, the two bodies of the electronic device are respectively connected to the two rotating shaft units of the dual-axis hinge. In order to prevent the two bodies from colliding during the opening and closing process, the design will result in a larger distance between the two bodies in the unfolded state. Therefore, there is still room for improvement. Summary of the invention

[0003] The object of the present invention is to provide a dual-axis synchronous hinge that can solve the above-mentioned problems.

[0004] The dual-axis synchronous hinge of the present invention includes a base unit, including a base and a protective cover arranged on the base, the base having a first surface, two rotation grooves recessed in the first surface and two rotation axis sliding grooves formed through the base, the rotation groove including a lower portion located below the rotation axis sliding groove and an upper portion located above the rotation axis sliding groove, the rotation axis sliding groove having an inner end and an outer end opposite to the inner end, the protective cover engages with the outer peripheral surface of the base and covers the first surface of the base, and has a base wall and two protruding columns extending from the base wall toward the base; and two rotation axis units, which are respectively rotatably penetrated in the base of the base unit, each rotation axis unit including a rotation axis rotatably penetrated in the rotation axis sliding groove of the base, a first rotating member fixedly sleeved on the rotating shaft, a second rotating member connected to the first rotating member and a fixed The cam is an angular channel that is adapted to move the first and second cams together to form a circle that is adapted to move the first and second cams together to form a circle that is adapted to move the first and second cams together.

[0005] In the dual-axis synchronous hinge described in the present invention, a plurality of second gear teeth are formed on the outer circumference of each second rotating member around the pivot hole, and the second gear teeth of the second rotating member are meshed with each other so that the second rotating member can rotate synchronously and drive the first rotating member to rotate synchronously by cooperating with the linkage column and the linkage hole.

[0006] The dual-axis synchronous hinge described in the present invention has an opening connected to the linkage hole, and the upper part of each rotation groove has a first end located on the inner side and a second end opposite to the first end. The shaft unit can also move from the first expanded position to the second expanded position. In the first expanded position, the linkage columns of the first rotation member are respectively located at the first end of the upper part and located in the linkage hole. The linkage columns of the first rotation member can respectively leave the linkage hole through the opening to separate from the second rotation member and move to the second end of the upper part to reach the second expanded position. At this time, the linkage columns are respectively located at the upper part of the rotation groove, the pivot plates extend downwardly relative to the rotation shaft, and the rotation shafts are respectively located at the inner ends of the rotation shaft slide grooves.

[0007] In the dual-axis synchronous hinge described in the present invention, a portion of the outer circumferential surface of the body of each first rotating member forms a plurality of first gear teeth, and when the rotating shaft unit moves from the first unfolded position to the second unfolded position, the first gear teeth engage with each other so that the first rotating member can rotate synchronously.

[0008] According to the dual-axis synchronous hinge described in the present invention, each first rotating member also has a first limit block formed on the surface of the main body facing the base, and the base also has two limit movable grooves recessed on the first surface for movably accommodating the first limit blocks and two stop blocks respectively located in the limit movable grooves, each limit movable groove has an inner side portion located next to the inner end of the rotating shaft slot and a lower side portion located below the rotating shaft slot, and the stop blocks are respectively located in the inner side portions, and when the rotating shaft unit is in the first expanded position, the stop blocks respectively block the first limit blocks to prevent the first rotating member from moving toward the outer end of the rotating shaft slot.

[0009] The dual-axis synchronous hinge described in the present invention has each first rotating member also having a second limit block formed on the surface of the main body facing the base and spaced from the first limit block, each limit movable groove also having an outer side portion located next to the outer end of the rotating shaft slide groove, each lower side portion having a second limit end located on the inner side and a first limit end located on the outer side relative to the second limit end, when the rotating shaft unit is in this initial position, the first limit block is located at the first limit end, during the process of the rotating shaft unit moving between the initial position and the first expanded position, the second limit block can be movably accommodated in the outer side portion, and during the process of the rotating shaft unit moving from the first expanded position to the second expanded position, the second limit block can be movably accommodated in the lower side portion and reach the second limit end to prevent the first rotating member from moving toward the outer end of the rotating shaft slide groove respectively.

[0010] The double-axis synchronous hinge described in the present invention has a base wall whose surface is recessed toward the base to form a rotation matching groove for movably accommodating the second rotating member, a rotation shaft matching groove whose two positions correspond to the rotation shaft slide groove, and a limit matching groove whose two positions correspond to the limit movable groove. The rotation shaft is rotatably inserted into the rotation shaft slide groove of the base and the rotation shaft matching groove of the protective cover. Each first rotating member also has a third limit block formed on the surface of the main body facing the protective cover and whose position corresponds to the second limit block. The third limit block can be movably accommodated in the corresponding limit matching groove.

[0011] In the dual-axis synchronous hinge of the present invention, the linkage column of each first rotating member is substantially cylindrical and has a longitudinal section.

[0012] In the dual-axis synchronous hinge of the present invention, each rotating shaft unit further includes at least one set of friction plates arranged on the rotating shaft and located between the base and the pivot plate.

[0013] The dual-axis synchronous hinge described in the present invention has a base that also has a second surface opposite to the first surface, and the second surface is recessed to form a receiving groove for accommodating the friction plate. Each friction plate has a main body and at least one elastic arm portion connected to the main body, and the elastic arm portion is formed with a protrusion. The base is recessed to form at least one groove for the protrusion to be inserted into.

[0014] The double-axis synchronous hinge described in the present invention, each rotating shaft has a first penetration section that is fixedly penetrated by the first rotating member, a movable section connected to the first penetration section and movably accommodated in the rotating shaft slide slot, a sleeve section connected to the movable section for the friction plate to be sleeved, and a second penetration section connected to the sleeve section that is fixedly penetrated by the pivot plate.

[0015] The beneficial effect of the present invention is that the rotating shaft unit can move between the initial position and the first expanded position, and the rotating shaft rotates together with the linkage column of the first rotating member, thereby driving the second rotating member to pivot and drive the rotating shaft to move from the outer end of the rotating shaft slot to the inner end, so that the distance between the two bodies driven by the rotating shaft unit can also be shortened accordingly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional diagram of an embodiment of the dual-axis synchronous hinge of the present invention disposed between two machine bodies, wherein the two rotating shaft units of the embodiment are in a first unfolded position and the machine bodies are in a first unfolded state;

[0017] Figure 2 is similar Figure 1 A three-dimensional view of the invention, wherein the rotating shaft unit is in an initial position and the body is in a folded state;

[0018] Figure 3is a stereogram of the embodiment;

[0019] Figure 4 is a three-dimensional exploded view of the embodiment;

[0020] Figure 5 is a three-dimensional view of a base of a base unit of the embodiment;

[0021] Figure 6 is a three-dimensional diagram of the base of the embodiment from another perspective;

[0022] Figure 7 is a rear view of a protective cover of a base unit of the embodiment;

[0023] Figure 8 is a three-dimensional diagram of a first rotating member and a second rotating member of a rotating shaft unit of the embodiment;

[0024] Fig. 9 is a three-dimensional diagram of the first rotating member and the second rotating member of the rotating shaft unit of the embodiment from another perspective;

[0025] Fig.10 is a top view of the embodiment;

[0026] Fig.11 Is Fig.10 A sectional view obtained by the section line XI-XI, illustrating that the shaft unit is in the first unfolded position;

[0027] Fig.12 Is Fig.10 A sectional view obtained by the section line XII-XII, illustrating that the shaft unit is in the first unfolded position;

[0028] Fig.13 is similar Fig.11 A cross-sectional view of the shaft unit, illustrating the shaft unit is in the initial position;

[0029] Fig.14 is similar Fig.12 A cross-sectional view of the shaft unit, illustrating the shaft unit is in the initial position;

[0030] Fig.15 is similar Fig.11 , illustrating the shaft unit in a second unfolded position; and

[0031] Fig.16 is similar Fig.12 A cross-sectional view of the shaft unit is shown in the second unfolded position. DETAILED DESCRIPTION

[0032] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0033] See also Figures 1 to 3 An embodiment of the dual-axis synchronous hinge 10 of the present invention is suitable for being disposed between two bodies 20 to form an electronic device 30. The electronic device 30 can be, for example, a foldable device or a handheld device such as a mobile phone, a tablet, a tablet computer, a notebook computer, etc. The dual-axis synchronous hinge 10 of this embodiment includes a base unit 1 and two rotating shaft units 2.

[0034] See also Figures 4 to 6 The base unit 1 includes a base 11 and a protective cover 12 disposed on the base 11. The base 11 has a first surface 111, a second surface 112 opposite to the first surface 111, two rotation grooves 113 recessed on the first surface 111, two rotation axis slots 114 formed through, two position limiting movable grooves 115 recessed on the first surface 111, two stopper blocks 116 respectively located at the position limiting movable grooves 115, a receiving groove 117 recessed on the second surface 112, and two slots 118 recessed on the second surface 112 and connected to the receiving groove 117 and located at the upper and lower sides thereof. Each rotation groove 113 includes a lower portion 113a located below the rotation axis slot 114 and an upper portion 113b located above the rotation axis slot 114. The upper portion 113b has a first end 113b1 located inside and a second end 113b2 opposite to the first end 113b1. Each shaft slide 114 has an inner end 114a and an outer end 114b opposite to the inner end 114a. The distance between the inner ends 114a of the shaft slide 114 is smaller than the distance between the outer ends 114b. Each limiting movable groove 115 has an inner side portion 115a located beside the inner end 114a of the shaft slide 114, a lower side portion 115b located below the shaft slide 114, and an outer side portion 115c located beside the outer end 114b of the shaft slide 114. The lower side portion 115b has a second limiting end 115b2 located inside and a first limiting end 115b1 located outside relative to the second limiting end 115b2. The locking blocks 116 are respectively located at the inner side portions 115 a , and their functions will be described later.

[0035] See also Figure 4 and Figure 7The protective cover 12 is engaged with the outer peripheral surface of the base 11 and covers the first surface 111 of the base 11. The protective cover 12 has a base wall 121, a surrounding wall 122 extending from the periphery of the base wall 121 toward the base 11 and engaged with the outer peripheral surface of the base 11, and two protrusions 123 extending from the base wall 121 toward the base 11. The surface of the base wall 121 facing the base 11 is recessed to form a rotation matching groove 121a whose position roughly corresponds to the rotation groove 113, two rotation shaft matching grooves 121b whose positions respectively correspond to the rotation shaft sliding grooves 114, and two position limiting matching grooves 121c whose positions respectively correspond to the position limiting movable grooves 115. The rotating groove 113 , the rotating shaft sliding groove 114 , the limiting movable groove 115 , the boss 123 , the rotating shaft matching groove 121 b and the limiting matching groove 121 c are all mirror-imaged and symmetrical with respect to the vertical center line of the base 11 .

[0036] See also Figure 4 , Figure 8 and Fig. 9 , the rotating shaft units 2 are rotatably inserted into the base 11 of the base unit 1. Each rotating shaft unit 2 includes a rotating shaft 21 rotatably inserted into the rotating shaft slot 114 of the base 11, a first rotating member 22 fixedly sleeved on the rotating shaft 21, a second rotating member 23 connected to the first rotating member 22, a pivot plate 25 fixedly sleeved on the rotating shaft 21, and a plurality of friction plates 24 respectively sleeved on the rotating shaft 21 and located between the base 11 and the pivot plate 25. Each rotating shaft 21 has a first insertion section 211 fixedly inserted into the first rotating member 22, a movable section 212 connected to the first insertion section 211 and movably accommodated in the rotating shaft slot 114, a sleeve section 213 connected to the movable section 212 for sleeved by the friction plate 24, and a second insertion section 214 connected to the sleeve section 213 and fixedly inserted into the pivot plate 25. The first penetration section 211 is a cylinder with two longitudinal sections, which is penetrated by the first rotating member 22 and can rotate in conjunction with the first rotating member 22. In this embodiment, the diameter of the sleeve section 213 is larger than the diameters of the first penetration section 211 and the second penetration section 214, but the present invention is not limited thereto.

[0037] Each first rotating member 22 has a body 221 fixedly sleeved on the first penetration section 211 of the rotating shaft 21, a linkage column 222 penetrating the body 221 and movably accommodated in the corresponding rotating groove 113, a first stopper 223 formed on the surface of the body 221 facing the base 11 and adjacent to the linkage column 222, a second stopper 224 formed on the surface of the body 221 facing the base 11 and spaced from the first stopper 223, and a third stopper 225 formed on the surface of the body 221 facing the protective cover 12 and corresponding to the second stopper 224. A portion of the outer circumference of the body 221 forms a plurality of first gear teeth 221a. Each linkage column 222 is substantially cylindrical and has a longitudinal section 222a. The first stopper 223 can be movably accommodated in the corresponding limit movable groove 115. The second limiting block 224 can be movably received in the lower side portion 115b and the outer side portion 115c of the limiting movable groove 115. The third limiting block 225 can be movably received in the corresponding limiting matching groove 121c.

[0038] Each second rotating member 23 is pivotally accommodated in the rotating matching groove 121a. Each second rotating member 23 has a pivot hole 231, a linkage hole 232, an opening 233 connected to the linkage hole 232, and a plurality of second gear teeth 234 formed on the outer circumference surrounding the pivot hole 231. The pivot hole 231 is for accommodating the corresponding protrusion 123. The linkage hole 232 is for accommodating the corresponding linkage column 222. The second gear teeth 234 of the second rotating member 23 are meshed with each other so that the second rotating member 23 can rotate synchronously and drive the first rotating member 22 to rotate synchronously by the cooperation between the linkage column 222 and the linkage hole 232.

[0039] The friction plate 24 of the rotating shaft unit 2 is accommodated in the accommodating groove 117. Each friction plate 24 has a main body 241 which is set on the corresponding sleeve section 213 and two elastic arm parts 242 which are respectively connected to the upper and lower ends of the main body 241. Each elastic arm part 242 is formed with a convex point 242a. The convex point 242a can be inserted into the corresponding slot 118 to play a role in positioning the rotating shaft unit 2. There is an interference fit between the friction plate 24 and the sleeve section 213. The friction force generated when the rotating shaft 21 and the friction plate 24 rotate relative to each other can provide the torque required for the dual-axis synchronous hinge 10 of the present invention to operate, but the method of generating torque is not limited to this form. Each pivot plate 25 is connected to the corresponding body 20 (see Figure 1 ) and is fixedly connected to the second penetration section 214 of the rotating shaft 21. In other embodiments, the protective cover 12 can omit the rotating shaft matching groove 121b and the limiting matching groove 121c, and the third limiting block 225 of each first rotating member 22 can also be omitted corresponding to the limiting matching groove 121c, which is not limited to the embodiment of the present invention.

[0040] See also Fig.11 , Fig.13 and Fig.15 , the shaft unit 2 can be in an initial position ( Fig.13 ), a first unfolded position ( Fig.11 ) and a second extended position ( Fig.15 When the shaft unit 2 rotates, the body 20 can be linked to a folded state (see Figure 2 ), a first unfolded state (see Figure 1 ) and a second unfolded state (not shown). Figure 2 , Fig.13 and Fig.14 In the initial position, the linkage column 222 of the first rotating member 22 is respectively located at the lower part 113a of the rotating groove 113, the first limit block 223 is respectively located at the first limit end 115b1 of the lower side part 115b of the limit movable groove 115, the second limit block 224 is respectively located at the outer side part 115c, the pivot plate 25 extends upward relative to the rotating shaft 21, the rotating shaft 21 is respectively located at the outer end 114b of the rotating shaft slide groove 114, the second rotating member 23 is located at the lower side of the rotating matching groove 121a due to the linkage with the linkage column 222 of the first rotating member 22, and at this time, the body 20 is in the folded state. When the user wants to use the electronic device 30 and needs to separate and unfold the body 20, the rotating shaft unit 2 continues to rotate and drives the linkage column 222 of the first rotating member 22 to rotate upward synchronously, and the second rotating member 23 rotates synchronously with each other. When one linkage column 222 moves from the lower part 113a to the first end 113b1 of the upper part 113b in the corresponding rotating groove 113, it will drive the corresponding second rotating member 23, and drive the linkage column 222 of another first rotating member 22 to move synchronously to the first unfolded position through another second rotating member 23. In the process, because the distance between each rotating shaft 21 and the lower part 113a is smaller than the distance between the rotating shaft 21 and the first end 113b1 of the upper part 113b, the movement of the linkage column 222 will drive the rotating shaft 21 to move toward the inner end 114a of the rotating shaft slot 114.

[0041] Matching reference Figure 1 , Fig.11 and Fig.12In the first unfolded position, the linkage column 222 is located at the first end 113b1 of the upper part 113b of the rotating groove 113, the first limit block 223 is located at the inner part 115a, the second limit block 224 is located at the outer part 115c and is ready to enter the lower part 115b, the pivot plate 25 extends horizontally outward relative to the rotating shaft 21, and the rotating shaft 21 is located at the inner end 114a of the rotating shaft slide groove 114. At this time, the body 20 corresponds to the first unfolded state, the angle between the body 20 is 180 degrees, and the stop block 116 can stop the first limit block 223 in the left and right directions in the figure to prevent the first rotating member 22 from moving toward the outer end 114b. Moreover, the protrusions 242a of the friction plate 24 are respectively inserted into the slot 118, thereby fixing the body 20 in the first unfolded state. When the linkage column 222 moves the first end 113b1 of the upper portion 113b of the rotating groove 113, the rotating shaft 21 is driven to move to the inner end 114a, so that the distance between the two bodies 20 driven by the rotating shaft unit 2 can be shortened accordingly. The rotating shaft unit 2 can continue to rotate so that the linkage column 222 respectively leaves the linkage hole 232 through the opening 233 to separate from the second rotating member 23 and move to the second end 113b2 of the upper portion 113b. During the process, the second limit block 224 respectively enters the lower side portion 115b, and the third limit block 225 respectively enters the space of the limit matching groove 121c corresponding to the lower side portion 115b. The second limit block 224 and the third limit block 225 are both used to prevent the first rotating member 22 from moving toward the outer end 114b of the rotating shaft sliding groove 114. It should be noted that, because the width of the opening 233 is smaller than the cylindrical diameter of the linkage column 222, the linkage column 222 is designed with a longitudinal section 222a so that the linkage column 222 can only leave the second rotating member 23 through the opening 233 when it moves to the first end 113b1 of the upper portion 113b of the rotating groove 113 because the longitudinal section 222a is aligned with the opening 233, thereby ensuring that the linkage column 222 will not be separated from the second rotating member 23 before moving to the first expanded position.

[0042] Matching reference Fig.15 and Fig.16In the second unfolded position, the linkage column 222 is respectively located at the second end 113b2 of the upper portion 113b of the rotating groove 113, and the second limit block 224 is respectively located at the second limit end 115b2 of the lower side portion 115b to stop the first rotating member 22 from rotating continuously, and the pivot plate 25 extends downward relative to the rotating shaft 21, and the rotating shaft 21 is respectively located at the inner end 114a of the rotating shaft slot 114. At this time, the body 20 corresponds to the second unfolded state, and the angle between the front faces of the body 20 is 360 degrees. As can be seen from the above, the dual-axis synchronous hinge 10 of the present invention can allow the opening and closing angle of the body 20 to be between 0 and 360 degrees, which can be used in a variety of usage scenarios.

[0043] In summary, the dual-axis synchronous hinge 10 of the present invention can move between the initial position and the first expanded position by means of the rotating shaft unit 2, and the rotating shaft 21 rotates with the linkage column 222 of the first rotating member 22, thereby driving the second rotating member 23 to pivot and drive the rotating shaft 21 to move from the outer end 114b of the rotating shaft slot 114 to the inner end 114a, so that the distance between the two bodies 20 driven by the rotating shaft unit 2 can also be shortened accordingly, so the purpose of the present invention can be achieved.

[0044] However, the above is only an embodiment of the present invention and should not be used to limit the scope of the present invention. All simple equivalent changes and modifications made according to the claims and the patent specification of the present invention are still within the scope of the present invention.

Claims

1. A dual-axis synchronous hinge, characterized in that: The biaxial synchronous hinge comprises: A base unit, comprising a base and a protective cover disposed on the base, the base having a first surface, two rotation grooves recessed in the first surface and two rotation shaft slots formed through the first surface, the rotation groove comprising a lower portion located below the rotation shaft slot and an upper portion located above the rotation shaft slot, the rotation shaft slot having an inner end and an outer end opposite to the inner end, the protective cover engaging with the outer peripheral surface of the base and covering the first surface of the base, and having a base wall and two protrusions extending from the base wall toward the base; and Two rotating shaft units are respectively rotatably inserted into the base of the base unit, each rotating shaft unit comprises a rotating shaft rotatably inserted into the rotating shaft slot of the base, a first rotating member fixedly sleeved on the rotating shaft, a second rotating member connected to the first rotating member and a pivot plate fixedly sleeved on the rotating shaft, the first rotating member comprises a body, a linkage column inserted into the body and movably accommodated in the corresponding rotating slot, the second rotating member comprises a pivot hole and a linkage hole, the pivot hole is for accommodating the corresponding convex column, and the linkage hole is for accommodating the corresponding linkage column; In which, the rotating shaft unit can move between an initial position and a first expanded position. In the initial position, the linkage columns of the first rotating member are respectively located at the lower part of the rotating groove, the pivot plates are respectively extended upward relative to the rotating shaft, and the rotating shafts are respectively located at the outer ends of the rotating shaft slide grooves. In the first expanded position, the linkage columns are respectively located at the upper part of the rotating grooves, the pivot plates are respectively extended horizontally outward relative to the rotating shaft, and the rotating shafts are respectively located at the inner ends of the rotating shaft slide grooves.

2. The dual-axis synchronous hinge according to claim 1, characterized in that: A plurality of second gear teeth are formed on the outer circumference of each second rotating member around the pivot hole, and the second gear teeth of the second rotating member mesh with each other so that the second rotating member can rotate synchronously and drive the first rotating member to rotate synchronously through the cooperation between the linkage column and the linkage hole.

3. The dual-axis synchronous hinge according to claim 2, characterized in that: Each second rotating member also has an opening connected to the linkage hole, and the upper part of each rotating groove has a first end located on the inner side and a second end opposite to the first end. The shaft unit can also move from the first expanded position to the second expanded position. In the first expanded position, the linkage columns of the first rotating member are respectively located at the first end of the upper part and located in the linkage hole. The linkage columns of the first rotating member can respectively leave the linkage hole through the opening to separate from the second rotating member and move to the second end of the upper part to reach the second expanded position. At this time, the linkage columns are respectively located at the upper part of the rotating groove, the pivot plates respectively extend downward relative to the rotating shaft, and the rotating shafts are respectively located at the inner ends of the rotating shaft slide grooves.

4. The dual-axis synchronous hinge according to claim 3, characterized in that: A portion of the outer circumference of the body of each first rotating member forms a plurality of first gear teeth. When the rotating shaft unit moves from the first unfolded position to the second unfolded position, the first gear teeth mesh with each other so that the first rotating member can rotate synchronously.

5. The dual-axis synchronous hinge according to claim 1, characterized in that: Each first rotating member also has a first limit block formed on the surface of the main body facing the base, and the base also has two limit movable grooves recessed on the first surface for movably accommodating the first limit blocks and two stop blocks respectively located in the limit movable grooves, each limit movable groove has an inner side portion located next to the inner end of the rotating shaft slot and a lower side portion located below the rotating shaft slot, and the stop blocks are respectively located in the inner side portions, and when the rotating shaft unit is in the first expanded position, the stop blocks respectively block the first limit blocks to prevent the first rotating member from moving toward the outer end of the rotating shaft slot.

6. The dual-axis synchronous hinge according to claim 5, characterized in that: Each first rotating member also has a second limit block formed on the surface of the main body facing the base and spaced from the first limit block, each limit movable groove also has an outer side portion located next to the outer end of the rotating shaft slide groove, each lower side portion has a second limit end located on the inner side and a first limit end located on the outer side relative to the second limit end, when the rotating shaft unit is in this initial position, the first limit block is located at the first limit end, during the movement of the rotating shaft unit between the initial position and the first expanded position, the second limit block can be movably accommodated in the outer side portion, and during the movement of the rotating shaft unit from the first expanded position to the second expanded position, the second limit block can be movably accommodated in the lower side portion and reach the second limit end to prevent the first rotating member from moving toward the outer end of the rotating shaft slide groove respectively.

7. The dual-axis synchronous hinge according to claim 6, characterized in that: The surface of the base wall facing the base is recessed to form a rotation matching groove for movably accommodating the second rotating member, two rotation shaft matching grooves corresponding to the rotation shaft slot and two limit matching grooves corresponding to the limit movable groove. The rotation shaft is rotatably inserted into the rotation shaft slot of the base and the rotation shaft matching groove of the protective cover respectively. Each first rotating member also has a third limit block formed on the surface of the main body facing the protective cover and corresponding to the second limit block. The third limit block can be movably accommodated in the corresponding limit matching groove.

8. The dual-axis synchronous hinge according to claim 3, characterized in that: The linkage column of each first rotating member is substantially cylindrical and has a longitudinal section.

9. The dual-axis synchronous hinge according to claim 1, characterized in that: Each rotating shaft unit also includes at least one set of friction plates arranged on the rotating shaft and located between the base and the pivot plate.

10. The dual-axis synchronous hinge according to claim 9, characterized in that: The base also has a second surface opposite to the first surface, and the second surface is recessed to form a receiving groove for accommodating the friction plate. Each friction plate has a main body and at least one elastic arm connected to the main body, and the elastic arm is formed with a protrusion. The base is recessed to form at least one slot for the protrusion to be inserted into.

11. The dual-axis synchronous hinge according to claim 9, characterized in that: Each rotating shaft has a first penetration section fixedly penetrating the first rotating member, a movable section connected to the first penetration section and movably accommodated in the rotating shaft sliding groove, a sleeve section connected to the movable section for sleeve mounting of the friction plate, and a second penetration section connected to the sleeve section and fixedly penetrating the pivot plate.

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