Folding device with rotary positioning function

Abstract

The invention discloses a folding device with a rotary positioning function. The folding device comprises a supporting unit and a biasing piece, the supporting unit comprises a mounting seat, two supporting rods and a rod piece, the mounting seat comprises a seat body, a through hole and two supporting holes, the through hole and the supporting holes penetrate through the seat body in the first axial direction, the supporting rods penetrate through the supporting holes and are in pivot joint with the seat body, and the rod piece penetrates through the through hole and is in pivot joint with the seat body in a rotating mode. The rod piece can rotate between a preparation position parallel to the first axial direction and a swing position forming an inclined angle with the first axial direction. The offset piece is arranged between the seat body and the rod piece and has an offset force for constantly driving the rod piece to rotate towards the swing position, when the rod piece is located at the preparation position, the supporting rod is parallel to the rod piece, and when the rod piece rotates to the swing position, the rod piece drives the supporting rod to be unfolded, and when the rod piece rotates to the swing position, the rod piece drives the supporting rod to rotate towards the swing position. And the rod piece and the supporting rod are obliquely crossed with each other so as to achieve the effect of automatically rotating and positioning.

Description

Technical Field

[0001] The invention relates to a folding device, in particular to a folding device with a rotation positioning function. Background Art

[0002] An existing folding chair as disclosed in Taiwan Patent No. M467398U includes a positioning seat, three supporting legs rotatably inserted into the positioning seat, a cloth body disposed at the top of the supporting legs, and two restraining belts disposed at the upper and lower ends of one of the supporting legs, respectively. When the folding chair is unfolded, the supporting legs are unfolded and the cloth body is spread out for sitting. When the folding chair is folded, the supporting legs are folded into a columnar shape, and the restraining belts respectively surround and restrain the upper and lower ends of the supporting legs.

[0003] The disadvantage of the folding chair is that when unfolding the folding chair, the supporting legs need to be unfolded manually, which is not only time-consuming and labor-intensive, but also has the risk of pinching hands. Summary of the invention

[0004] An object of the present invention is to provide a folding device with a rotation positioning function which can improve at least one of the above-mentioned disadvantages.

[0005] The folding device with a rotational positioning function described in the present invention comprises a support unit and a biasing member. The support unit comprises a mounting seat, two support rods, and a rod member. The mounting seat comprises a seat body, and a through hole and two support holes that penetrate the seat body along a first axial direction. The support rods respectively pass through the support holes and are pivotally connected to the seat body. The rod member passes through the through holes and extends along the central axis. The rod member can be pivotally connected to the seat body around a rotation axis that is transverse to the central axis. The rod member can rotate relative to the seat body between a preparatory position parallel to the first axial direction and a swing position with an inclination angle to the first axial direction. The biasing member is arranged between the seat body and the rod member and has a biasing force that constantly drives the rod member to rotate toward the swing position. When the rod member is in the preparatory position, the support rod is parallel to the rod member. When the rod member rotates to the swing position, the rod member drives the support rod to unfold, and the rod member and the support rod are obliquely crossed with each other.

[0006] In the folding device with a rotational positioning function described in the present invention, the biasing member is a torsion spring and has a spring coil portion arranged between the rod and the seat body, a first arm portion connected to one end of the spring coil portion and abutting against the seat body, and a second arm portion connected to an end of the spring coil portion opposite to the first arm portion and abutting against the rod.

[0007] In the folding device with rotation positioning function described in the present invention, when the rod is located at the preparation position, the first arm portion is adjacent to the second arm portion, and when the rod is located at the swing position, the first arm portion is away from the second arm portion.

[0008] The folding device with a rotational positioning function described in the present invention comprises: a seat body having a pivot groove adjacent to the through hole; a rod member having a pivot seat; the pivot seat having a main body, a pivot block protruding from the main body and rotatably disposed in the pivot groove, and a convex portion protruding from the main body; the second arm portion is located between the first arm portion and the convex portion and abuts against the convex portion; and the pivot block extends along the rotation axis and passes through the spring coil portion.

[0009] In the folding device with a rotation positioning function described in the present invention, the pivot groove has a first groove portion for accommodating the pivot block, and a second groove portion connected to the first groove portion and for movably accommodating the protrusion.

[0010] The folding device with a rotational positioning function described in the present invention, the seat body also has an inner circumferential surface surrounding the through hole, a first end surface connected to one side of the inner circumferential surface along the first axial direction, and a second end surface connected to the side of the inner circumferential surface opposite to the first end surface along the first axial direction, the rotation axis extends along a second axial direction perpendicular to the first axial direction, the inner circumferential surface has a first inner surface segment located on one side of the through hole along a third axial direction perpendicular to the first axial direction and the second axial direction, a second inner surface segment located on the other side of the through hole along the third axial direction, and a first connecting surface segment connected between the first inner surface segment and the second inner surface segment and for the rod member to be pivotally connected, the first inner surface segment and the second inner surface segment extend obliquely relative to the first axial direction, and the offset member is arranged between the first connecting surface segment and the rod member , when the rod is located in the preparation position, the side of the rod facing the first inner surface segment abuts against the portion of the first inner surface segment adjacent to the first end surface and is spaced from the portion of the first inner surface segment adjacent to the second end surface, and the side of the rod facing the second inner surface segment abuts against the portion of the second inner surface segment adjacent to the second end surface and is spaced from the portion of the second inner surface segment adjacent to the first end surface, and when the rod is located in the swing position, the side of the rod facing the first inner surface segment abuts against the portion of the first inner surface segment adjacent to the second end surface and is spaced from the portion of the first inner surface segment adjacent to the first end surface, and the side of the rod facing the second inner surface segment abuts against the portion of the second inner surface segment adjacent to the first end surface and is spaced from the portion of the second inner surface segment adjacent to the second end surface.

[0011] In the folding device with rotational positioning function described in the present invention, the biasing member is a torsion spring and has a spring coil portion arranged between the rod and the first connecting surface segment, a first arm portion connected to one end of the spring coil portion and abutting against the seat body, and a second arm portion connected to the other end of the spring coil portion and abutting against the rod.

[0012] The folding device with a rotational positioning function described in the present invention comprises: the seat body further comprising an inner circumferential surface surrounding the through hole, and a first end surface and a second end surface respectively connected to two opposite sides of the inner circumferential surface along the first axial direction, a slot being formed on the inner circumferential surface of the seat body, the biasing member being a spring sheet bent into a V-shape and having an embedded portion inserted into the slot, and a spring sheet portion extending from the embedded portion toward a direction adjacent to the first end surface, the spring sheet portion having an elastic end opposite to the embedded portion and elastically abutting against the rod member, when the rod member is located in the preparatory position, the elastic end of the spring sheet portion is pushed against by the rod member and adjacent to the inner circumferential surface of the seat body, the spring sheet portion and the embedded portion sandwich a force storage angle, when the rod member is located in the swinging position, the elastic end of the spring sheet portion pushes against the rod member and moves away from the inner circumferential surface of the seat body, and the spring sheet portion and the embedded portion sandwich a release angle greater than the force storage angle.

[0013] The folding device with a rotational positioning function described in the present invention, the support unit also includes a locking member arranged on the rod and capable of being detachably coupled to the seat body; when the locking member is coupled to the seat body, the rod is located in the preparation position and cannot rotate relative to the seat body; when the locking member is uncoupled from the seat body, the rod can rotate toward the swing position relative to the seat body.

[0014] The beneficial effect of the present invention is that the biasing force of the biasing member drives the rod to rotate to the swing position, and the rod drives the support rod, so that the rod and the support rod automatically rotate and unfold to position. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a three-dimensional combined diagram of the first embodiment of the folding device with a rotation positioning function of the present invention in a folded state;

[0016] Figure 2 is a partial three-dimensional exploded view of the first embodiment;

[0017] Figure 3 is a perspective exploded view of a rod, a biasing member and a mounting seat of a support unit of the first embodiment;

[0018] Figure 4 is along Figure 1 An incomplete cross-sectional view taken along line IV-IV in FIG. 1 , but with two struts omitted;

[0019] Figure 5 is along Figure 4 An incomplete cross-sectional view obtained along the line VI-VI;

[0020] Figure 6 is a three-dimensional combined diagram of the first embodiment in an unfolded state;

[0021] Figure 7 is along Figure 6 An incomplete cross-sectional view taken along line VII-VII in FIG. 1 , but omitting the strut;

[0022] Figure 8 is along Figure 4 An incomplete cross-sectional view taken along line VIII-VIII;

[0023] Fig. 9 is along Figure 7 An incomplete cross-sectional view taken along line IX-IX;

[0024] Fig.10 is along Figure 7 An incomplete cross-sectional view obtained by line XX in;

[0025] Fig.11 It is an incomplete three-dimensional exploded view of a mounting base and a biasing member of a second embodiment of the folding device with a rotation positioning function of the present invention;

[0026] Fig.12 is a fragmentary cross-sectional view of a rod member of the second embodiment in a preparation position; and

[0027] Fig.13 is a similar Fig.12 sectional view, but the lever is in a swiveled position. DETAILED DESCRIPTION

[0028] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments. Before the present invention is described in detail, it should be noted that the first axial direction Z, the second axial direction X and the third axial direction Y described in the following description are perpendicular to each other, the first axial direction Z extends up and down, and similar elements are represented by the same number.

[0029] See also Figure 1 ,and Figure 2 The first embodiment of the folding device with a rotation positioning function of the present invention comprises a supporting unit 10, a biasing member 20, and a folding unit 30.

[0030] The support unit 10 includes a mounting base 1 , two support rods 2 , a rod member 3 , and a locking member 4 .

[0031] The mounting seat 1 includes a seat body 11 , and a through hole 12 and two branch holes 13 penetrating the seat body 11 along the first axial direction Z.

[0032] See also Figure 3 and Figure 4 The seat body 11 has an inner circumferential surface 111 surrounding and defining the through hole 12, a first end surface 112 connected to one side of the inner circumferential surface 111 along the first axial direction Z, and a second end surface 113 connected to a side of the inner circumferential surface 111 opposite to the first end surface 112 along the first axial direction Z. The first end surface 112 is located above the second end surface 113.

[0033] The inner circumferential surface 111 has a first inner surface segment 1111 located at one side of the through hole 12 along the third axial direction Y, a second inner surface segment 1112 located at the other side of the through hole 12 along the third axial direction Y, a first connecting surface segment 1113 connected between the first inner surface segment 1111 and the second inner surface segment 1112, and a second connecting surface segment 1114 connected between the first inner surface segment 1111 and the second inner surface segment 1112 and facing the first connecting surface segment 1113. The first inner surface segment 1111 and the second inner surface segment 1112 extend obliquely relative to the first axial direction Z. The first connecting surface segment 1113 is located at the outer side of the second connecting surface segment 1114 relative to the seat body 11. A pivot groove 114 adjacent to the through hole 12 is formed on the first connecting surface segment 1113. The pivot groove 114 has a first groove portion 1141 and a second groove portion 1142 connected to the first groove portion 1141. The second groove portion 1142 is located between the first groove portion 1141 and the first inner surface segment 1111. An embedding groove 115 adjacent to the through hole 12 is formed on the second connecting surface segment 1114.

[0034] See also Figure 2 , Figure 4 and Figure 5 The support rods 2 pass through the support holes 13 and are pivotally connected to the seat body 11 .

[0035] The rod 3 passes through the through hole 12 and extends along a central axis L1. The rod 3 has a pivot seat 31 surrounding the central axis L1 and pivotally connected to the seat body 11, a fixed tube 32 fixed in the pivot seat 31, an intermediate tube 33 movably disposed in the fixed tube 32, and an inner tube 34 movably disposed in the intermediate tube 33.

[0036] See also Figures 3 to 5The pivot seat 31 has a body 311, a pivot block 312 protruding from the body 311, and a protrusion 313 protruding from the body 311 and spaced apart from the pivot block 312. The pivot block 312 extends along a rotation axis L2 and is rotatably disposed in the first groove portion 1141. The rotation axis L2 is perpendicular to the central axis L1 and passes through the first groove portion 1141 and the second connecting surface segment 1114, so that the rod 3 can rotate relative to the seat body 11 around the rotation axis L2.

[0037] The protrusion 313 is received in the second groove 1142 , and when the rod 3 rotates, the protrusion 313 can move in the second groove 1142 .

[0038] See also Figure 4 , Figure 6 and Figure 7 The fixing tube 32 has a locking through hole 321 penetrating in a radial direction perpendicular to the central axis L1. The intermediate tube 33 has a retracting hole 331 penetrating in a radial direction perpendicular to the central axis L1.

[0039] The locking member 4 is a spring sheet formed by bending twice. The locking member 4 is disposed on the side of the pivot seat 31 opposite to the pivot block 312 along the rotation axis L2. The locking member 4 has an elastic portion 41 and a locking portion 42. The elastic portion 41 has a fixed section 411 fixed between the pivot seat 31 and the fixed tube 32, and an elastic segment 412 extending obliquely from the fixed section 411 toward the direction of the intermediate tube 33. The locking portion 42 has an abutting end 421 connected to the elastic segment 412 and adjacent to the intermediate tube 33, and an embedded end 422 extending from the abutting end 421 in a direction parallel to the rotation axis L2 away from the intermediate tube 33 and penetrating the pivot seat 31.

[0040] The included angle between the elastic segment 412 and the fixing segment 411 is greater than 90 degrees, and the elastic portion 41 has a biasing force that constantly drives the locking portion 42 to move toward the middle tube 33. The included angle between the locking portion 42 and the elastic segment 412 is less than 90 degrees.

[0041] See also Figure 4 and Figure 5The biasing member 20 is disposed between the first connecting surface section 1113 and the rod 3. The biasing member 20 is a torsion spring and has a coil portion 201 disposed on the rod 3 and located in the first groove portion 1141, a first arm portion 202 connected to one end of the coil portion 201, and a second arm portion 203 connected to the other end of the coil portion 201. The pivot block 312 passes through the coil portion 201. The first arm portion 202 and the second arm portion 203 extend toward the second end surface 113. The first arm portion 202 is located in the first groove portion 1141, and the second arm portion 203 is located between the first arm portion 202 and the protrusion 313. The elastic force of the coil portion 201 constantly drives the first arm portion 202 to abut against the seat body 11, and constantly drives the second arm portion 203 to abut against the protrusion 313.

[0042] In this embodiment, each of the support rods 2 is a telescopic rod having a structure similar to the rod 3, and the difference from the rod 3 is that each of the support rods 2 is not provided with the locking member 4 and the biasing member 20. In other variations of this embodiment, the structural type of the support rods 2 is not limited, and the locking member 4 and the biasing member 20 may also be provided on any one of the support rods 2.

[0043] See also Figure 2 and Figure 6 The folding unit 30 can be foldably disposed at the top ends of the rod 3 and the support rod 2, and can be driven by the rod 3 and the support rod 2 to unfold for the user to sit on.

[0044] See also Figure 5 , Figure 8 and Fig. 9 , the rod 3 can rotate relative to the seat body 11 between a preparatory position parallel to the first axial direction Z and a swing position with an inclination angle θs with respect to the first axial direction Z. The biasing force of the biasing member 20 can constantly drive the rod 3 to rotate toward the swinging position. Specifically, the biasing force of the biasing member 20 is the elastic force of the spring coil 201.

[0045] See also Figure 2 , Figure 5 and Figure 8When the rod 3 is located at the preparation position, the side of the rod 3 facing the first inner surface segment 1111 abuts against the portion of the first inner surface segment 1111 adjacent to the first end surface 112 and is spaced from the portion of the first inner surface segment 1111 adjacent to the second end surface 113, and the side of the rod 3 facing the second inner surface segment 1112 abuts against the portion of the second inner surface segment 1112 adjacent to the second end surface 113 and is spaced from the portion of the second inner surface segment 1112 adjacent to the first end surface 112. The first arm portion 202 of the biasing member 20 abuts against the second arm portion 203, the first arm portion 202 abuts against the seat body 11, and the second arm portion 203 abuts against the protrusion 313.

[0046] See also Figure 6 , Fig. 9 and Fig.10 When the rod 3 is located in the swing position, the second arm 203 of the biasing member 20 pushes against the protrusion 313 and moves away from the first arm 202, and the side of the rod 3 facing the first inner surface segment 1111 abuts against the portion of the first inner surface segment 1111 adjacent to the second end surface 113, and is spaced from the portion of the first inner surface segment 1111 adjacent to the first end surface 112, and the side of the rod 3 facing the second inner surface segment 1112 abuts against the portion of the second inner surface segment 1112 adjacent to the first end surface 112, and is spaced from the portion of the second inner surface segment 1112 adjacent to the second end surface 113.

[0047] See also Figure 4 and Figure 7 , the locking member 4 can be detachably coupled to the base body 11, so that the supporting unit 10 can be transformed between a locked state and a free state.

[0048] When the support unit 10 is in the locked state, the rod 3 is in the ready position, and the middle tube 33 is retracted into the fixed tube 32, and the inner tube 34 is retracted into the middle tube 33. The abutting end 421 of the locking portion 42 abuts against the middle tube 33, and the embedded end 422 is aligned and extends into the embedded groove 115, and the locking member 4 is coupled to the seat body 11, so that the rod 3 cannot rotate relative to the seat body 11.

[0049] See also Figure 4 , Figure 6 and Figure 7When the support unit 10 is in the free state, the rod 3 is stretched, the retraction hole 331 of the intermediate tube 33 is aligned with the locking portion 42, the abutting end 421 of the locking portion 42 extends into the retraction hole 331, and the engaging end 422 of the locking portion 42 withdraws from the embedding groove 115, and the locking member 4 is uncoupled from the seat body 11, so that the rod 3 can rotate to the swing position.

[0050] See also Figure 1 and Figure 6 The folding device with a rotational positioning function can be transformed between a folded state and an unfolded state.

[0051] When the folding device with a rotational positioning function is in the folded state, the rod 3 is in the preparatory position, the support rod 2 is parallel to the rod 3, and the rod 3 and the support rod 2 are both in a retracted state, the support unit 10 is in the locked state, and the folding unit 30 is folded at the top of the rod 3 and the support rod 2.

[0052] When the folding device with a rotational positioning function changes from the folded state to the unfolded state, the rod 3 and the support rod 2 are stretched, the support unit 10 changes from the locked state to the free state, the locking member 4 is uncoupled from the seat body 11, and the elastic force of the biasing member 20 drives the second arm portion 203 to rebound against the protrusion 313, so that the rod 3 rotates to the swing position. At this time, the bottom of the inner tube 34 of the rod 3 pushes against and drives the bottom of the support rod 2 to drive the support rod 2 to rotate, so that the rod 3 and the support rod 2 automatically rotate and unfold to position. After unfolding, the rod 3 and the support rod 2 cross each other obliquely to stand on the ground, and the folding unit 30 is driven to unfold by the rod 3 and the support rod 2.

[0053] It should be noted that in other variations of this embodiment, the number of the biasing members 20 is not limited, and the number of the biasing members 20 can also be three, and they are respectively disposed on the support rod 2 and the rod 3, so that the support rod 2 also has the function of automatic rotation positioning.

[0054] Therefore, the first embodiment of the folding device with a rotational positioning function of the present invention drives the rod 3 to rotate to the swing position through the biasing force of the biasing member 20, and drives the support rod 2 with the rod 3, so that the rod 3 and the support rod 2 automatically rotate and unfold to position, thereby truly achieving the purpose of the present invention.

[0055] See also Figures 11 to 13, a mounting seat 1' and a biasing member 20' of the second embodiment of the folding device with a rotation positioning function of the present invention, the difference between the second embodiment and the first embodiment is that the pivot groove 114 of the mounting seat 1' is formed on the second connecting surface section 1114 of the inner peripheral surface 111, and a clamping groove 116 is formed on the first inner surface section 1111. The biasing member 20' is a metal spring bent into a V-shape and includes an embedded portion 201' inserted into the clamping groove 116, and a spring portion 202' extending from the embedded portion 201' toward the direction adjacent to the first end surface 112. The spring portion 202' has an elastic end 2021' opposite to the embedded portion 201' and elastically abutting against the pivot seat 31. Therefore, the biasing member 20' has a biasing force constantly applied to the pivot seat 31. Specifically, the biasing force of the biasing member 20' is the elastic force generated by its bending.

[0056] The position of the pivot seat 31 subjected to the force of the elastic end 2021' is relatively located between the rotation axis L2 and the first end surface 112 along the first axial direction Z. Therefore, when the elastic end 2021' pushes against the pivot seat 31, the rod 3 can be rotated relative to the seat body 11 around the rotation axis L2. In addition, since the biasing member 20' is located between the rod 3 and the first inner surface section 1111 along the third axial direction Y, the direction of the biasing force applied by the biasing member 20' to the rod 3 is the same as the rotation direction of the rod 3. Therefore, the complete elastic force of the biasing member 20' itself can be used to push the rod 3 to rotate, so as to reduce the loss of elastic energy of the biasing member 20'.

[0057] When the rod 3 is located at the preparatory position, the elastic end 2021' of the spring piece 202' is pushed by the rod 3 and is adjacent to the first inner surface section 1111. The spring piece 202' and the embedded portion 201' form a force storage angle θ1, so that the biasing member 20' stores an elastic energy. When the elastic energy is released, the elastic end 2021' of the spring piece 202' pushes against the rod 3 and moves away from the first inner surface section 1111. The spring piece 202' and the embedded portion 201' form a release angle θ2 greater than the force storage angle θ1, so that the rod 3 rotates to the swing position. Therefore, the second embodiment can also achieve the same purpose and effect as the first embodiment by the biasing member 20' rebounding against the rod 3 to drive the rod 3 to rotate. Similar to the first embodiment, in other variations of this embodiment, the number of the biasing members 20 ′ can also be three, and they are respectively disposed on the support rod 2 and the rod 3 , so that the support rod 2 also has the function of automatic rotation positioning.

[0058] The above are merely embodiments 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 description of the present invention are still within the scope of the present invention.

Claims

1. A folding device with a rotation positioning function, characterized in that Include: A support unit, comprising a mounting seat, two support rods, and a rod member, wherein the mounting seat comprises a seat body, and a through hole and two support holes penetrating the seat body along a first axial direction, the support rods respectively pass through the support holes and are pivotally connected to the seat body, the rod member passes through the through hole and extends along a central axis, the rod member can be pivotally connected to the seat body around a rotation axis that is transverse to the central axis, and the rod member can rotate relative to the seat body between a preparatory position parallel to the first axial direction and a swing position having an inclination angle with the first axial direction; and A biasing member is arranged between the seat body and the rod and has a biasing force that constantly drives the rod to rotate toward the swing position. When the rod is located at the preparatory position, the support rod is parallel to the rod. When the rod rotates to the swing position, the rod drives the support rod to unfold, and the rod and the support rod are obliquely crossed with each other.

2. The folding device with rotation positioning function according to claim 1, characterized in that: The biasing member is a torsion spring and has a coil portion disposed between the rod and the seat body, a first arm portion connected to one end of the coil portion and abutting against the seat body, and a second arm portion connected to an end of the coil portion opposite to the first arm portion and abutting against the rod.

3. The folding device with rotation positioning function according to claim 2, characterized in that: When the lever is located at the ready position, the first arm portion is adjacent to the second arm portion, and when the lever is located at the swing position, the first arm portion is away from the second arm portion.

4. The folding device with rotation positioning function according to claim 2, characterized in that: The seat body has a pivot groove adjacent to the through hole, the rod member has a pivot seat, the pivot seat has a main body, a pivot block protruding from the main body and rotatably arranged in the pivot groove, and a convex portion protruding from the main body, the second arm portion is located between the first arm portion and the convex portion and abuts against the convex portion, and the pivot block extends along the rotation axis and passes through the spring coil portion.

5. The folding device with rotation positioning function according to claim 4, characterized in that: The pivot groove has a first groove portion for accommodating the pivot block, and a second groove portion communicating with the first groove portion and for movably accommodating the protrusion.

6. The folding device with rotation positioning function according to claim 1, characterized in that: The seat body also has an inner circumferential surface surrounding the through hole, a first end surface connected to one side of the inner circumferential surface along the first axial direction, and a second end surface connected to the side of the inner circumferential surface opposite to the first end surface along the first axial direction, the rotation axis extends along a second axial direction perpendicular to the first axial direction, the inner circumferential surface has a first inner surface segment located on one side of the through hole along a third axial direction perpendicular to the first axial direction and the second axial direction, a second inner surface segment located on the other side of the through hole along the third axial direction, and a first connecting surface segment connected between the first inner surface segment and the second inner surface segment and for the rod member to be pivotally connected, the first inner surface segment and the second inner surface segment extending obliquely relative to the first axial direction, the offset member is arranged between the first connecting surface segment and the rod member, and when the rod member is located in the When in the preparation position, the side of the rod member facing the first inner surface segment abuts against the portion of the first inner surface segment adjacent to the first end surface and is spaced from the portion of the first inner surface segment adjacent to the second end surface, and the side of the rod member facing the second inner surface segment abuts against the portion of the second inner surface segment adjacent to the second end surface and is spaced from the portion of the second inner surface segment adjacent to the first end surface. When the rod member is in the swinging position, the side of the rod member facing the first inner surface segment abuts against the portion of the first inner surface segment adjacent to the second end surface and is spaced from the portion of the first inner surface segment adjacent to the first end surface, and the side of the rod member facing the second inner surface segment abuts against the portion of the second inner surface segment adjacent to the first end surface and is spaced from the portion of the second inner surface segment adjacent to the second end surface.

7. The folding device with rotation positioning function according to claim 6, characterized in that: The biasing member is a torsion spring and has a coil portion disposed between the rod and the first connecting surface segment, a first arm portion connected to one end of the coil portion and abutting against the seat body, and a second arm portion connected to the other end of the coil portion and abutting against the rod.

8. The folding device with rotation positioning function according to claim 1, characterized in that: The seat body also includes an inner circumferential surface surrounding the through hole, and a first end surface and a second end surface respectively connected to the two opposite sides of the inner circumferential surface along the first axial direction, a groove is formed on the inner circumferential surface of the seat body, the biasing member is a spring sheet bent into a V-shape and has an embedded portion inserted into the groove, and a spring sheet portion extending from the embedded portion in a direction adjacent to the first end surface, the spring sheet portion has an elastic end opposite to the embedded portion and elastically abuts against the rod member, when the rod member is in the preparatory position, the elastic end of the spring sheet portion is pushed by the rod member and is adjacent to the inner circumferential surface of the seat body, the spring sheet portion and the embedded portion sandwich a force storage angle, when the rod member is in the swinging position, the elastic end of the spring sheet portion pushes the rod member and moves away from the inner circumferential surface of the seat body, the spring sheet portion and the embedded portion sandwich a release angle greater than the force storage angle.

9. The folding device with rotation positioning function according to claim 1, characterized in that: The support unit also includes a locking member arranged on the rod and capable of being detachably coupled to the seat body. When the locking member is coupled to the seat body, the rod is located in the preparation position and cannot rotate relative to the seat body. When the locking member is uncoupled from the seat body, the rod can rotate toward the swing position relative to the seat body.

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