TWI500855B - Hinge assembly of sequentially locking type - Google Patents

Description

Sequentially locked pivot assembly

This creation relates to a pivot assembly, and more particularly to a sequential locking pivot assembly.

In recent years, touch screens have become more mature, and electronic devices equipped with touch screens are also increasing. In addition to tablet computers and smart phones that rely on touch operations, some notebook computers have begun to configure touch screens. Make your notebook a tablet. The notebook computer with a touch screen includes a first board body and a second board body. The first board is, for example, an upper cover on which a touch screen is mounted, and the second board is, for example, a base on which computer components, a battery, and a keyboard are mounted. In order to allow the notebook computer to operate as a tablet computer, it is required to set the screen of the first board body outward, and the first board body and the second board body are close to each other. In order to achieve such a state, the connection means between the first plate body and the second plate body may be in the following manners.

In the first method, a first pivoting portion is disposed at a center of one side of the first plate body, and a center corresponding to the first pivoting portion is disposed at a center of one side of the second plate body. The second pivoting portion is connected to the second pivoting portion by the first pivoting portion, and the first plate body and the second plate body are relatively rotatable, so that the reading and the touch operation or Different requirements such as typing input to change the angle between the second plate and the first plate. Moreover, the first plate body can be rotated 180 degrees with respect to the second plate body, and then the second plate body is closed and aligned, and the screen of the first plate body faces outward. In this way, the notebook computer will form a tablet-like state, which is convenient for the user to touch or use. However, the above-mentioned pivotal structure belongs to a single point support, so the structural strength is weak, and after a long period of use, there is a fear of breakage.

The second method is to provide a two-axis pivot assembly on the same side of the first plate body and the second plate body, the two-axis pivot assembly has a first axis and a second axis, and the first axis and the first axis The two shafts are respectively connected to the first plate body and the second plate body, such that the first plate body and the second plate body are relatively pivoted between 0 degrees and 360 degrees, when the first plate body and the second plate body are relatively pivoted At 360 degrees, the first plate and the second plate are closed and the screen of the first plate faces outward. Then, such a biaxial pivot assembly often has a case where the first shaft and the second shaft do not coincide with each other during rotation, resulting in inconvenience in operation and unsatisfactory rotation.

In view of this, the purpose of the present invention is to propose a sequential locking pivot assembly, in order to enable the first axis and the second axis to be sequentially locked, thereby improving smoothness during rotation and convenience in operation.

To achieve the above object, the present application proposes a sequential locking pivot assembly that includes a support portion, a first shaft, a second shaft, and a locking member. The first shaft has a first positioning portion, and the second shaft has a second positioning portion, wherein the first shaft and the second shaft are respectively rotatable connection support portions. The locking member is slidably coupled to the support portion, the locking member selectively stopping the first positioning portion and locking the first shaft or the selective stop second positioning portion and locking the second shaft.

The present invention provides a sequential locking pivot assembly, which can lock the first shaft and the second shaft sequentially by the cooperation of the locking member and the first flange and the second flange, compared with the prior art. This creation improves the smoothness of rotation and the convenience of operation, while also providing durability.

To make the objects, features, and advantages of the present invention more comprehensible to those of ordinary skill in the art, the following description of the preferred embodiments and the accompanying drawings are set forth below.

10‧‧‧Electronic devices
11‧‧‧ first board
12‧‧‧Second plate
13, 13A‧‧‧Sequentially locked pivot assembly
14‧‧‧ appearance parts
20‧‧‧Support
21, 21A‧‧‧ support plate
22‧‧‧Axis hole
23, 23A‧‧‧through hole
24, 24A‧‧‧ first stop block
25, 25A‧‧‧ second stop block
26A‧‧‧Limited surface
30, 30A‧‧‧ first axis
31‧‧‧First flange
32, 32A‧‧‧ first front flange
33, 33A‧‧‧ first rear flange
40, 40A‧‧‧ second axis
41‧‧‧second flange
42, 42A‧‧‧ second front flange
43, 43A‧‧‧second rear flange
50, 50A‧‧‧ Locking parts
51, 51A‧‧‧ first arm
52, 52A‧‧‧ second arm
53, 53A‧‧‧ connecting arms
54, 54A‧‧‧ Balance arm
55, 55A‧‧‧ first contact surface
56, 56A‧‧‧second contact surface
57A‧‧‧balance block
61, 62‧‧‧ fixed plate
70‧‧‧ Positioning components
71‧‧‧ Positioning frame
72‧‧‧ positioning ring
73‧‧‧Flexible ring

FIG. 1 is a schematic diagram showing a 0 degree closure of an electronic device according to a preferred embodiment of the present invention.
Figure 2 is an exploded view of a sequential locking pivot assembly of a preferred embodiment of the present invention.
FIG. 3 is a 0 degree state diagram 1 of the sequential locking pivot assembly of the preferred embodiment of the present invention.
Figure 4 is a diagram showing the state of the 0 degree state of the sequential locking pivot assembly of a preferred embodiment of the present invention.
FIG. 5 is a schematic diagram showing the 180 degree expansion of the electronic device according to a preferred embodiment of the present invention.
Figure 6 is a diagram showing a 180 degree state diagram of the sequential locking pivot assembly of a preferred embodiment of the present invention.
Figure 7 is a second diagram of the 180 degree state of the sequential locking pivot assembly of a preferred embodiment of the present invention.
Figure 8 is a third diagram of the 180 degree state of the sequential locking pivot assembly of a preferred embodiment of the present invention.
FIG. 9 is a schematic diagram showing the 360 degree expansion of the electronic device according to a preferred embodiment of the present invention.
Figure 10 is a diagram showing a 360 degree state diagram of the sequential locking pivot assembly of a preferred embodiment of the present invention.
Figure 11 is a perspective view of the 360 degree state of the sequential locking pivot assembly of a preferred embodiment of the present invention.
Figure 12 is a diagram showing the state of operation of the sequential locking pivot assembly at 0 to 360 degrees in accordance with a preferred embodiment of the present invention.
Figure 13 is an exploded view of a sequential locking pivot assembly of another preferred embodiment of the present invention.
Figure 14 is a schematic view showing the combination of the sequential locking pivot assembly of another preferred embodiment of the present invention.

Please refer to FIG. 1 and FIG. 2 simultaneously, wherein FIG. 2 shows an embodiment of a sequential locking pivot assembly, and FIG. 1 shows an electronic using the sequential locking pivot assembly of FIG. Device. The electronic device 10 includes a first plate body 11 , a second plate body 12 and a sequential locking pivot assembly 13 . The first plate body 11 is, for example, an upper cover to which a touch screen can be further mounted, and the second plate body 12 can be further The base of the computer component, the battery and the keyboard is installed, and the sequential locking pivot assembly 13 has two and symmetrically disposed on the same side of the first plate body 11 and the second plate body 12, wherein the sequential locking pivot assembly The outer side of the 13 is covered with an appearance member 14. The sequential locking pivot assembly 13 includes a support portion 20, a first shaft 30, a second shaft 40, a locking member 50, fixing plates 61, 62, and a positioning assembly 70. The first shaft 30 has a first positioning portion, and the second shaft 40 has a second positioning portion. As shown in FIG. 2, in the embodiment, the first positioning portion is a first flange 31, and the second positioning portion is It is the second flange 41. The first shaft 30 and the second shaft 40 are respectively rotatably connected to the support portion 20, and the first shaft 30 and the second shaft 40 are parallel to each other, and the locking member 50 is slidably coupled to the support portion 20 in a sliding direction, and the sliding direction is parallel. In the axial direction of the first shaft 30 and the second shaft 40. By the axial sliding of the locking member 50 relative to the first shaft 30 and the second shaft 40, the locking member 50 can selectively stop the first flange 31 and lock the first shaft 30, or an optional stop. The second flange 41 locks the second shaft 40.

The support portion 20 includes two support plates 21 which are spaced apart from each other and are parallel to each other. The support plate 21 is provided with a shaft hole 22 and a through hole 23, and the first shaft 30 and the second shaft 40 are respectively rotatable. It is inserted into the corresponding shaft hole 22 on the two support plates 21. A first stop block 24 and a second stop block 25 are respectively protruded from the two support plates 21, the first stop block 24 corresponds to the first flange 31, and the second stop block 25 corresponds to the second flange 41. . In detail, the first flange 31 includes a first front flange 32 and a first rear flange 33, and the second flange 41 includes a second front flange 42 and a second rear flange 43, the support portion 20 is located at the first Between the front flange 32 and the first rear flange 33 and between the second front flange 42 and the second rear flange 43, the first front flange 32 and the second front flange 42 are arranged side by side and located at the support portion 20 On one side, the first rear flange 33 is disposed side by side with the second rear flange 43 and on the other side of the support portion 20.

In the present embodiment, the first front flange 32 and the first shaft 30 and the second front flange 42 and the second shaft 40 are integrally formed, respectively, and the first rear flange 33 and the second rear flange 43 respectively have a non-circular shaft hole (not numbered) that matches the shaft body having a non-circular cross section on the first shaft 30 and the second shaft 40, thus when the first shaft 30 or the second shaft 40 rotates The first front flange 32 and the first rear flange 33 or the second front flange 42 and the second rear flange 43 will rotate correspondingly, and when the first front flange 32 and the first rear flange 33 are used When the first shaft 30 is locked and cannot be rotated when one is locked, or the second front flange 42 and the second rear flange 43 are locked, the second shaft 40 is locked and cannot be rotated. . In addition, the first stop block 24 is disposed corresponding to the first rear flange 33, which can selectively restrict the rotation of the first rear flange 33; the second stop block 25 corresponds to the second front protrusion A rim 42 is provided that selectively limits the rotation of the second front flange 42.

The locking member 50 has a first arm 51, a second arm 52, a connecting arm 53 and two balancing arms 54. The first arm 51 and the second arm 52 are respectively connected to the two ends of the connecting arm 53 and the first arm The second arm 52 and the second arm 52 extend opposite to each other. The first arm 51 has a first contact surface 55 away from the end of the connecting arm 53 and the second end 52 of the second arm 52 away from the connecting arm 53 has a second contact surface 56. The two balance arms 54 are respectively connected to the two ends of the connecting arm 53 and the two balance arms 54 extend opposite to each other. The two balance arms 54 are respectively located on opposite sides of the first arm 51 and the second arm 52. With the above structure, the locking member 50 forms an H-shaped geometry, and the lengths of the first arm 51 and the second arm 52 are longer than those of the balance arm 54. In other embodiments, the locking member can also omit the two balance arms, having only the first arm, the second arm, and the connecting arm to form a U-shaped geometry.

The first arm 51 and the first contact surface 55 are disposed corresponding to the first front flange 32, and the second arm 52 and the second contact surface 56 are disposed corresponding to the second rear flange 43. The first contact surface 55 is substantially The upper surface is an inclined surface with respect to the first flange 31, and the second contact surface 56 is substantially an inclined surface with respect to the second flange 41. The inclination directions of the first contact surface 55 and the second contact surface 56 are opposite to each other. There are two through holes 23 in the support plate 21, so that the two support plates 21 have four through holes 23, and the first arm 51, the second arm 52 and the two balance arms 54 are respectively slidably disposed in the four through holes 23 The connecting arm 53 is located between the two supporting plates 21. When the locking member 50 slides in the sliding direction, the first arm 51, the second arm 52 and the two balance arms 54 move in the four through holes 23, respectively. Because the lengths of the first arm 51 and the second arm 52 are long, one of the first contact surface 55 and the second contact surface 56 can selectively pass through the through hole 23 to protrude away from the support plate 21 The other side of the connecting arm 53. Since the balance arm 54 has a short length, the balance arm 54 does not pass through the through hole 23 regardless of how the lock member 50 slides. In addition, the through hole 23 and the first arm 51, the second arm 52, and the two balance arms 54 are complementary in cross-sectional structure. With such a structure, the balance arm 54 can increase the balance of the lock member 50 on the slide. stability. In addition, during the rotation of the first shaft 30 and the second shaft 40, the first flange 31 and the second flange 41 are selectively blocked from one of the two through holes 23 adjacent to the rotation path thereof. By.

The fixing plate 61 is fixed between the first shaft 30 and the first plate body 11. The fixing plate 62 is fixed between the second shaft 40 and the second plate body 12, so that the first plate body 11 and the second plate body When the 12 is pulled, the first shaft 30 and the second shaft 40 rotate accordingly. The positioning assembly 70 includes a positioning frame 71, a positioning ring member 72 and an elastic ring member 73. The positioning assembly 70 is sleeved on the first shaft 30 and the second shaft 40, wherein the positioning frame 71 is fixed without following the first The shaft 30 and the second shaft 40 rotate, and the positioning ring member 72 and the elastic ring member 73 rotate with the first shaft 30 and the second shaft 40. The positioning frame 71 and the positioning ring member 72 are respectively provided with corresponding protrusions and grooves (not labeled) on the mutually facing sides, and the elastic ring member 73 applies pressure (ie, elastic restoring force) to make the positioning ring member. 72 continues to abut the positioning frame 71, through the relative positional relationship between the protrusion and the groove, the positioning ring 72 and the positioning frame 71 can be opened (when the bump climbs along the slope on both sides of the groove) or When they are fitted to each other (when the bumps completely match the grooves), correspondingly, the elastic restoring force generated by the elastic ring members 73 is increased or decreased. With such a configuration, the positioning assembly 70 can gradually increase or decrease the frictional force over a specific range of angles, which can cause the first shaft 30 and the second shaft 40 to be positioned or increased in a specific angular range.

The following describes the operation principle of the sequential locking pivot assembly, and please refer to the relevant state diagram and the 0 to 360 degree actuation state change diagram of Figure 12:

0 degree closed state: FIG. 1 shows a 0 degree state in which the electronic device 10 is closed at the first plate body 11 and the second plate body 12, and FIGS. 3 and 4 show a sequential locking pivot assembly 13 The view of two different angles of view in the 0 degree state, the upper and lower diagrams of Fig. 12(a) are the front view (in the upper one) and the rear view (the upper one) and the rear view of the sequential locking pivot assembly 13 in the 0 degree state, respectively. In the next one). In the 0 degree state, since the second front flange 42 is blocked by the second stopper 25 (as in the front view of FIG. 4 and FIG. 12(a)), the second shaft 40 cannot be rotated counterclockwise (refer to 3), at the same time, the first arm 51 and the first contact surface 55 are blocked by the first front flange 32, so that the first arm 51 cannot pass through the through hole 23, so that the second contact surface 56 is maintained at another Outside of the side through holes 23 (as in the rear view of Figs. 3 and 12(a)), the second rear flange 43 is blocked by the second contact surface 56 so that the second shaft 40 cannot rotate clockwise ( Referring to the direction of Fig. 3, therefore, in the 0 degree state, the second shaft 40 is locked, and only the first shaft 30 is rotatable, that is, only the first plate body 11 can be pulled. Also, since one side of the first rear flange 33 is blocked by one side of the first stopper 24 (as in the rear view of FIGS. 3 and 12(a)), the first shaft 30 can only rotate counterclockwise. (Refer to the direction of Figure 3).

180 degree unfolded state: FIG. 5 shows a state in which the first plate body 11 is unfolded by 180 degrees, and the appearance member 14 is omitted for convenience of explanation, and FIG. 6 shows a state in which the first shaft 30 is rotated by 180 degrees, and the seventh state is shown. The difference between the figure and Fig. 6 is that the locking member 50 of Fig. 7 is in a state of being slid. In fact, the sliding of the locking member 50 is caused by pushing the second contact surface 56 when the second rear flange 43 rotates. For convenience of explanation, only the sliding state of the locking member 50 is illustrated in FIGS. 6 and 7, and FIG. 8 is another viewing angle of FIG. 7, and the upper and lower images of FIG. 12(b) are respectively The sequential locking pivot assembly 13 has a front view (above) and a rear view (below) in a 180 degree state. From 0 degrees to 180 degrees (as shown in Fig. 12(a) to Fig. 12(b)), the first plate 11 is expanded by 180 degrees and the first axis 30 is rotated counterclockwise (refer to the direction of Fig. 6). Degree, at this time, the other side of the first rear flange 33 is stopped by the other side of the first stopper 24 (such as the rear view of FIGS. 6 and 12(b)), and the first front flange 32 is no longer blocked in the through hole 23 (as in the front view of FIG. 8 and FIG. 12(b)), so the locking member 50 can slide in the sliding direction (as shown in FIGS. 6 to 7), The two arms 52 and the second contact surface 56 are slidably and retracted into the through hole 23, and the first arm 51 and the first contact surface 55 are slidably protruded from the through hole 23 (as shown in FIG. 8). . Since the locking member 50 has a degree of freedom of sliding in the sliding direction in the 180 degree state, the second rear flange 43 is no longer stopped by the second contact surface 56 (as shown in FIG. 7), and the second shaft 40 has The degree of freedom of clockwise rotation (refer to the directions of Figs. 6 and 7), that is, after the first plate body 11 is unfolded by 180 degrees, then only the second plate body 12 can be pulled. When the second plate 12 is pulled to cause the second shaft 40 to rotate clockwise, the second arm 52 and the second contact surface 56 shown in FIG. 6 are gradually pressed into the through hole by the second rear flange 43. In the 23, the first arm 51 and the first contact surface 55 are gradually protruded beyond the through hole 23 on the other side.

360 degree unfolded state: FIG. 9 shows that the second board body 12 is unfolded by 180 degrees, so that the electronic device 10 as a whole is fully 360 degrees, and the appearance member 14 is omitted for convenience of explanation, and FIG. 10 shows The second shaft 40 is rotated by 180 degrees, the 11th is another angle of view of FIG. 10, and the upper and lower diagrams of FIG. 12(c) are front views of the sequential locking pivot assembly 13 in a 360 degree state, respectively. (in the upper one) and rear view (in the lower one). From the state of 180 degrees to 360 degrees (as shown in Figs. 12(b) to 12(c)), the second plate body 12 is pulled to cause the second shaft 40 to rotate clockwise (refer to the direction of Fig. 10). 180 degrees, in the process, the second arm 52 and the second contact surface 56 are gradually pressed into the through hole 23 by the second rear flange 43, so that the first arm 51 and the first contact surface 55 gradually protrude from the other Outside the through hole 23 on the side. In the 360 degree state, the second front flange 42 is stopped by the second stopper 25 (as in the front view of FIG. 11 and FIG. 12(c)), so that the second shaft 40 cannot be rotated clockwise (refer to 10 map direction). In addition, the second rear flange 43 is blocked in the through hole 23 (as shown in the rear view of FIG. 10 and FIG. 12(c)), so that the second contact surface 56 and the second arm 52 are blocked in the through hole 23. Forcing the first contact surface 55 and the first arm 51 to protrude beyond the through hole 23 on the other side (as shown in FIG. 11), so that the first front flange 32 of the first shaft 30 is replaced by the first contact surface 55. Blocking (as in the front view of FIG. 11 and FIG. 12(c)) causes the first shaft 30 to be unable to rotate clockwise (refer to the direction of FIG. 10), while the first rear flange 33 is blocked by the first stop block 24 The stopper (such as the rear view of Fig. 10 and Fig. 12(c)) prevents the first shaft 30 from rotating counterclockwise (refer to the direction of Fig. 10). That is, in the 360 degree state, the first shaft 30 is locked, and the second shaft 40 has only the degree of freedom of counterclockwise rotation (refer to the direction of Fig. 10).

In the case that the user wants to reverse the electronic device 10 from the 360 degree state to the 0 degree state, since the first axis 30 is locked in the 360 degree state, the second axis 40 needs to be rotated 180 degrees first (eg, 12 (c) to 12 (b)), after which the second shaft 40 is locked and then rotated 180 degrees by the first shaft 30 (as shown in Fig. 12(b) to Fig. 12(a)), returning For the 0 degree state, please refer to the above description for the principle of operation, and details are not described herein.

Referring to Figures 13 and 14, there is shown another embodiment of a sequential locking pivot assembly, the sequential locking pivot assembly 13A and the first to the twelfth shown in Figs. The difference in the sequential locking pivot assembly 13 is that there is only one support plate 21A of the sequential locking pivot assembly 13A and the structure of the locking member 50A is slightly changed. In detail, the support plate 21A has two through holes 23A, one side of the support plate 21A has a first stopper 24A and the other side has a second stopper 25A, and the first stopper 24A corresponds to the first shaft 30A. The first rear flange 33A and the second stop 25A correspond to the second front flange 42A of the second shaft 40A. In this embodiment, the inner side of the support plate 21A extends with two opposite limiting faces 26A. The two limiting faces 26A will contact the two sides of the locking member 50A, thereby restricting the sliding direction of the locking member 50A, and improving the locking member 50A. Stability when sliding.

The locking member 50A includes a first arm 51A, a second arm 52A, a connecting arm 53A, a balance arm 54A and a weight 57A, the first arm 51A has a first contact surface 55A, and the second arm 52A has a second contact Face 56A, wherein first arm 51A, second arm 52A, connecting arm 53A, first contact surface 55A and second contact surface 56A are similar in structure and correspond to corresponding elements of sequential locking pivot assembly 13, but The balance arm 54A has only one and is connected to one end of the link arm 53A and is located on the opposite side of the second arm 52A, and the weight 57A is located in the middle of the link arm 53A and abuts the second arm 52A. The first arm 51A and the balance arm 54A are respectively slid in the two through holes 23A. The first arm 51A and the first contact surface 55A correspond to the first front flange 32A, and the second arm 52A corresponds to the second contact surface 56A. At the second rear flange 43A.

In summary, the present invention provides a sequential locking pivot assembly that allows the first shaft and the second shaft to be sequentially locked by the interlocking of the locking member, the first flange and the second flange. Compared with the prior art, the present invention improves the smoothness during rotation and the convenience in operation, and also has durability.

Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention, and anyone skilled in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of protection is subject to the definition of the scope of the patent application.

no

13‧‧‧Sequentially locked pivot assembly

20‧‧‧Support

21‧‧‧Support plate

22‧‧‧Axis hole

23‧‧‧through hole

24‧‧‧First stop block

25‧‧‧Second stop

30‧‧‧first axis

31‧‧‧First flange

32‧‧‧First front flange

33‧‧‧First rear flange

40‧‧‧second axis

41‧‧‧second flange

42‧‧‧Second front flange

43‧‧‧Second rear flange

50‧‧‧Locking parts

51‧‧‧First arm

52‧‧‧second arm

53‧‧‧Connecting arm

54‧‧‧ Balance arm

55‧‧‧First contact surface

56‧‧‧Second contact surface

61, 62‧‧‧ fixed plate

70‧‧‧ Positioning components

71‧‧‧ Positioning frame

72‧‧‧ positioning ring

73‧‧‧Flexible ring

Claims (10)

A sequential locking pivot assembly comprising:
a support portion;
a first shaft, the first shaft has a first positioning portion;
a second shaft, the second shaft has a second positioning portion, wherein the first shaft and the second shaft are respectively rotatably connected to the support portion;
a locking member slidably connecting the support portion, the locking member selectively stopping the first positioning portion and locking the first shaft or selectively stopping the second positioning portion and locking the second shaft. The sequential locking pivot assembly of claim 1, wherein the first shaft and the second shaft are parallel to each other, and the locking member is slidably coupled to the support portion in a sliding direction, the sliding direction being parallel In the axial direction of the first axis and the second axis. The sequential locking pivot assembly of claim 2, wherein the first positioning portion comprises a first flange, the second positioning portion comprises a second flange, the locking member comprises a first a contact surface and a second contact surface, the first flange corresponding to the first contact surface, and the second flange corresponding to the second contact surface. The sequential locking pivot assembly of claim 3, wherein the locking member has a first arm, a connecting arm and a second arm, the first arm and the second branch The arms are respectively connected to the two ends of the connecting arm, and the first arm and the second arm extend opposite to each other, the first contact surface is located at an end of the first arm facing away from the connecting arm, the second contact surface Located at one end of the second arm facing away from the connecting arm. The sequential locking pivot assembly of claim 4, wherein the locking member further has two balance arms respectively connected to the two ends of the connecting arm and the two balance arms are opposite to each other The two balance arms are respectively located on opposite sides of the first arm and the second arm. The sequential locking pivot assembly of claim 3, wherein the first contact surface is substantially an inclined surface relative to the first flange, the second contact surface being substantially opposite to the An inclined surface of the second flange, the inclined directions of the first contact surface and the second contact surface are opposite to each other. The sequential locking pivot assembly of claim 3, wherein the first flange includes a first front flange and a first rear flange, the second flange including a second front a flange and a second rear flange, the support portion being located between the first front flange and the first rear flange and between the second front flange and the second rear flange, the first front a flange disposed alongside the second front flange and located at one side of the support portion, the first rear flange being disposed side by side with the second rear flange and located on the other side of the support portion, wherein the first The contact surface corresponds to the first front flange, and the second contact surface corresponds to the second rear flange. The sequential locking pivot assembly of claim 4, wherein the support portion comprises two support plates, the two support plates are spaced apart from each other and parallel to each other, and the first shaft and the second shaft are respectively The rotating support is disposed on the two supporting plates, and the two supporting plates are respectively disposed with a through hole, wherein the first arm and the second arm are respectively slidably disposed in the two through holes, and the connecting arm is located at the two supporting plates between. The sequential locking pivot assembly of claim 8, wherein the first flange and the second flange are selectively blocked from one of the two through holes. The sequential locking pivot assembly of claim 5, wherein the support portion comprises two support plates, the two support plates are spaced apart from each other and parallel to each other, and the first shaft and the second shaft are respectively The two supporting plates are respectively disposed on the two supporting plates, and the two supporting holes are respectively disposed with two through holes, and the first arm, the second arm and the two balancing arms are respectively slidably disposed in the four through holes, and the connection is The arm is located between the two support plates.