Extended pivot device

Abstract

The invention discloses an extension type pivot device which comprises a fixed support, a movable support, a driven frame set and a buffer assembly, the driven frame set comprises a first driven frame and a second driven frame, one end of the first driven frame and one end of the second driven frame are pivoted, the other end of the first driven frame is pivoted to the movable support, and the other end of the second driven frame is pivoted to the fixed support. The first driven frame is provided with a first abutting part; the buffering assembly comprises a linear sliding rail fixed to the second driven frame, a sliding block capable of sliding on the linear sliding rail in a reciprocating mode, an elastic assembly and a damper, wherein the elastic assembly and the damper are elastically supported between the linear sliding rail and the sliding block. The end, away from the linear sliding rail, of the sliding block is provided with a second abutting part abutting against the first abutting part. Therefore, the extension type pivot device has the characteristics of slow descending and continuous closing in a default range.

Description

Technical Field

[0001] The present invention relates to a pivot device, and in particular to an extended pivot device. Background Art

[0002] Most cabinets on the market are provided with openable cabinet doors, and refrigerators in particular use an extended pivot device having a plurality of connecting rods pivotally connected to each other to connect the cabinet doors, so as to achieve functions such as the cabinet doors being able to open at a large angle and being pulled away from the cabinet.

[0003] However, as awareness of various usage requirements increases, cabinet doors are required to have the effects of slow-down, continuous closing, and opening and stopping within a preset range. Therefore, how to design an extended pivot that can slow-down, continuous closing, and opening and stopping within a preset range is an important issue in the industry.

[0004] In view of this, the inventor has devoted himself to studying the above-mentioned prior art and has applied the theory to try his best to solve the above-mentioned problems, which has become the development goal of the inventor. Summary of the invention

[0005] The present invention provides an extended pivot device, which utilizes a second abutting portion to give a thrust to a first abutting portion through an elastic component and a damper, so as to achieve the characteristics of slow descent and continuous closing of the extended pivot device within a default range.

[0006] In an embodiment of the present invention, the present invention provides an extended pivot device, including: a fixed bracket; a movable bracket; a driven frame group, including a first driven frame and a second driven frame pivotally connected at one end, the other end of the first driven frame is pivotally connected to the movable bracket, the other end of the second driven frame is pivotally connected to the fixed bracket, and the first driven frame has a first abutment portion; and a buffer assembly, including a linear slide rail fixed to the second driven frame, a slider that can slide back and forth on the linear slide rail, and an elastic assembly and a damper elastically supported between the linear slide rail and the slider, and the end of the slider away from the linear slide rail has a second abutment portion abutting against the first abutment portion.

[0007] Based on the above, when the user opens the cabinet door and the movable bracket and then lets go, the second abutting portion will give a thrust to the first abutting portion through the elastic component and the damper. Due to the torque principle, the first driven frame can be pulled to rotate in a direction close to the second driven frame, so that the movable bracket, the driven frame assembly and the connecting rod frame assembly can meet and fold against each other, so as to achieve the characteristics of slow descent and continuous closing of the extended pivot device within the default range.

[0008] Based on the above, after the user pulls open the cabinet door and the movable bracket and then releases it, when the second abutting portion is blocked, although the elastic component and the damper continuously push against the second abutting portion, the first driven frame cannot be pulled to rotate towards the direction close to the second driven frame because the second abutting portion is blocked, so that the movable bracket, the driven frame group and the link frame group will remain stationary in place, so as to achieve the characteristic that the extended pivot device stops as it is opened within the default range. Description of the Drawings

[0009] Figure 1 is an exploded perspective view of the buffer component of the present invention;

[0010] Figure 2 is an exploded perspective view of the link frame group of the present invention;

[0011] Figure 3 is an exploded perspective view of the extended pivot device of the present invention;

[0012] Figure 4 is a first use state perspective view of the extended pivot device of the present invention;

[0013] Figure 5 is another first use state perspective view of the extended pivot device of the present invention;

[0014] Figure 6 is a first use state sectional view of the extended pivot device of the present invention;

[0015] Figure 7 is a second use state perspective view of the extended pivot device of the present invention;

[0016] Figure 8 is another second use state perspective view of the extended pivot device of the present invention;

[0017] Figure 9 is a second use state sectional view of the extended pivot device of the present invention;

[0018] Figure 10 is a third use state perspective view of the extended pivot device of the present invention;

[0019] Figure 11 is another third use state perspective view of the extended pivot device of the present invention;

[0020] Figure 12 is a third use state sectional view of the extended pivot device of the present invention;

[0021] Figure 13 is an exploded perspective view of another embodiment of the extended pivot device of the present invention;

[0022] Figure 14 is a first use state perspective view of another embodiment of the extended pivot device of the present invention;

[0023] Figure 15 is a perspective view of another first use state of another embodiment of the extended pivot device of the present invention;

[0024] Figure 16 is a sectional view of the first use state of another embodiment of the extended pivot device of the present invention;

[0025] Figure 17 is a perspective view of the second use state of another embodiment of the extended pivot device of the present invention;

[0026] Figure 18 is a perspective view of another second use state of another embodiment of the extended pivot device of the present invention;

[0027] Figure 19 is a sectional view of the second use state of another embodiment of the extended pivot device of the present invention;

[0028] Figure 20 is a perspective view of the third use state of another embodiment of the extended pivot device of the present invention;

[0029] Figure 21 is a perspective view of another third use state of another embodiment of the extended pivot device of the present invention;

[0030] Figure 22 is a sectional view of the third use state of another embodiment of the extended pivot device of the present invention;

[0031] Wherein, reference numerals:

[0032] 10: Extended pivot device;

[0033] 1: Fixed bracket;

[0034] 2: Movable bracket;

[0035] 21, 21’: First pivot part;

[0036] 22, 22’: Second pivot part;

[0037] 23: Long slot;

[0038] 3: Driven frame group;

[0039] 31: First driven frame;

[0040] 310: Outer frame;

[0041] 311: Round hole;

[0042] 312: Latching and positioning part;

[0043] 32: Second driven frame;

[0044] 33: First abutting part;

[0045] 4: Buffer assembly;

[0046] 41: Linear slide rail;

[0047] 411: Shaft rod;

[0048] 412: Grooved slot;

[0049] 42: Slide block;

[0050] 421: Hollow sliding sleeve;

[0051] 422: Extension piece;

[0052] 43: Elastic component;

[0053] 44: Damper;

[0054] 441: Piston rod;

[0055] 45: Second abutting part;

[0056] 5: Linkage bracket group;

[0057] 51: First linkage bracket;

[0058] 52: Second linkage bracket;

[0059] 6: Driven link;

[0060] 61: Driven cam;

[0061] 611: Circular outer periphery;

[0062] 612: Protruding arc block;

[0063] 7: Driving link;

[0064] 8: Moving pivot;

[0065] 9: Driving cam;

[0066] 91: Notch;

[0067] H: Spacing;

[0068] S1: First accommodation space;

[0069] S2: Second accommodation space. Detailed implementation manners

[0070] The detailed description and technical content of the present invention will be described below in conjunction with the drawings. However, the attached drawings are only for illustrative purposes and are not intended to limit the present invention.

[0071] Please refer to Figures 1 to 12As shown in the figure, the present invention provides an extended pivot device. This extended pivot device 10 mainly includes a fixed bracket 1, a movable bracket 2, a driven frame group 3 and a buffer assembly 4.

[0072] As Figures 3 to 12 shown, the fixed bracket 1 is usually fixedly connected to a cabinet (not shown in the figure), and the movable bracket 2 is usually fixedly connected to a cabinet door (not shown in the figure), so that the cabinet door can be opened or closed relative to the cabinet through the extended pivot device 10. The movable bracket 2 has a first pivot portion 21 and a second pivot portion 22 which are spaced apart and is provided with a long hole 23.

[0073] As Figures 3 to 12 shown, the driven frame group 3 includes a first driven frame 31 and a second driven frame 32 which are pivotally connected at one end. The other end of the first driven frame 31 is pivotally connected to the movable bracket 2, and the other end of the second driven frame 32 is pivotally connected to the fixed bracket 1. The other end of the first driven frame 31 has a first abutting portion 33.

[0074] As Figure 1 、 Figures 3 to 12 shown, the buffer assembly 4 includes a linear slide rail 41 fixed to the second driven frame 32, a slider 42 that can reciprocally slide on the linear slide rail 41, an elastic assembly 43 that is elastically supported between the linear slide rail 41 and the slider 42, and a damper 44. One end of the slider 42 away from the linear slide rail 41 has a second abutting portion 45 that abuts against the first abutting portion 33. Among them, the damper 44 can be an oil pressure damper, a hydraulic damper or a pneumatic damper.

[0075] Specifically described as follows, the linear slide rail 41 is a shaft rod 411 fixed to the second driven frame 32. The shaft rod 411 is recessed with a groove 412 along its axial direction. The slider 42 is a hollow sliding sleeve 421 that can reciprocally move and is sleeved on the shaft rod 411. One end of the hollow sliding sleeve 421 extends with a second abutting portion 45, and the other end extends with an extension piece 422 that can reciprocally move and pass through the groove 412. The elastic assembly 43 is accommodated in the hollow sliding sleeve 421 and is elastically supported between the shaft rod 411 and the second abutting portion 45. The damper 44 is accommodated in the hollow sliding sleeve 421 and is elastically supported between the shaft rod 411 and the extension piece 422. The damper 44 has a piston rod 441 that abuts against the shaft rod 411.

[0076] As Figures 2 to 12As shown in the figure, the extended pivot device 10 of the present invention further includes a link frame group 5. The link frame group 5 includes a first link bracket 51 arranged in parallel with the first driven frame 31 and a second link bracket 52 arranged in parallel with the second driven frame 32. One end of the first link bracket 51 is pivotally connected to the movable bracket 2, and the other end is pivotally connected between the two ends of the second link bracket 52. One end of the second link bracket 52 is pivotally connected to the fixed bracket 1, and the other end is pivotally connected between the two ends of the first driven frame 31. The driven frame group 3 and the link frame group 5 are respectively pivotally connected between the fixed bracket 1 and the movable bracket 2. The link frame group 5 is used to assist the driven frame group 3 and jointly pull the movable bracket 2 away from or close to the fixed bracket 1.

[0077] As Figures 3 to 12 shown, the first driven frame 31 includes an outer frame 310 and a passive link 6. One end of the outer frame 310 is pivotally connected to the second driven frame 32, and the other end is pivotally connected to the movable bracket 2. One end of the outer frame 310 adjacent to the movable bracket 2 is provided with a round hole 311 and has a locking and positioning portion 312. One end of the passive link 6 is pivotally connected to the second driven frame 32, and the other end is pivotally connected between the two ends of the second link bracket 52 and the outer frame 310. The first abutting portion 33 is a passive cam 61 extending from one end of the passive link 6 adjacent to the second driven frame 32, and the passive cam 61 abuts against the second abutting portion 45.

[0078] Further description is as follows. The outer peripheral edge of the passive cam 61 has a circular outer periphery 611. One end of the circular outer periphery 611 away from the outer frame 310 extends a protruding arc block 612, and the distance H between the second driven frame 32 and the passive cam 61 is smaller than the size of the second abutting portion 45.

[0079] Therefore, when the second abutting portion 45 abuts against the protruding arc block 612, the second abutting portion 45 can give a thrust to the protruding arc block 612 through the elastic component 43 and the damper 44, that is, give a thrust to the first abutting portion 33. This thrust pulls the outer frame 310 and the passive link 6 to rotate towards the direction close to the second driven frame 32, that is, pulls the first driven frame 31 to rotate towards the direction close to the second driven frame 32.

[0080] In addition, when the second abutting portion 45 moves towards the distance H and abuts against the circular outer periphery 611, the second abutting portion 45 will be blocked between the circular outer periphery 611 and the second driven frame 32.

[0081] As Figures 3 to 12As shown, the extended pivot device 10 of the present invention further includes an active link 7 and a movable pivot 8. One end of the active link 7 and one end of the first link bracket 51 adjacent to the movable bracket 2 are pivotally connected to the first pivot 21, and the other end of the active link 7 is pivotally connected to the second pivot 22. The movable pivot 8 is pivotally connected to the elongated hole 23 of the movable bracket 2 and the circular hole 311 of the first driven bracket 31, so that the latch positioning portion 312 can move along the elongated hole 23 through the movable pivot 8.

[0082] When the second abutting portion 45 abuts against the arc block 612 , the latch positioning portion 312 is separated from the active connecting rod 7 . When the second abutting portion 45 moves to the spacing H and abuts against the circular periphery 611 , the latch positioning portion 312 is latched with the active connecting rod 7 .

[0083] Furthermore, the latch positioning portion 312 of the present embodiment is an active cam 9 fixed to one end of the outer frame 310 adjacent to the movable bracket 2 and swinging along with the one end of the outer frame 310 adjacent to the movable bracket 2. The active cam 9 is provided with a notch 91, and the active connecting rod 7 can be engaged or disengaged from the notch 91.

[0084] In addition, the fixed bracket 1 has a first accommodating space S1 inside, and the movable bracket 2 has a second accommodating space S2 inside. When the fixed bracket 1 and the movable bracket 2 are against each other, the driven frame assembly 3, the buffer assembly 4, the connecting rod frame assembly 5, the passive connecting rod 6, the active connecting rod 7, the movable pivot 8 and the active cam 9 can all be hidden in the first accommodating space S1 and the second accommodating space S2.

[0085] like Figures 3 to 12 FIG. 1 shows the use state of the extended pivot device 10 of the present invention. First, the elastic component 43 and the damper 44 will continue to apply a thrust to the second abutting portion 45 before reaching the reset state, until the elastic component 43 and the damper 44 reach the reset state, and then the elastic component 43 and the damper 44 will stop applying a force to the second abutting portion 45.

[0086] like Figures 3 to 6 As shown, it is the first use state of the extended pivot device 10 of the present invention. When the second abutting portion 45 abuts against the arc block 612, the second abutting portion 45 gives a thrust to the arc block 612 through the elastic component 43 and the damper 44, that is, gives a thrust to the first abutting portion 33. Due to the torque principle, it can pull the outer frame 310 and the passive connecting rod 6 to rotate toward the direction close to the second driven frame 32, that is, pull the first driven frame 31 to rotate toward the direction close to the second driven frame 32, until the fixed bracket 1 and the movable bracket 2 abut against each other, and the driven frame assembly 3, the buffer assembly 4, the connecting rod frame assembly 5, the passive connecting rod 6, the active connecting rod 7, the movable pivot 8 and the active cam 9 are all hidden in the first accommodating space S1 and the second accommodating space S2.

[0087] like Figures 7 to 9As shown in the figure, this is the second usage state of the extended pivot device 10 of the present invention. After the user pulls open the cabinet door and the movable bracket 2 and then releases it, since the second abutting portion 45 and the protruding arc block 612 still abut against each other, the thrust given by the second abutting portion 45 to the first abutting portion 33 through the elastic component 43 and the damper 44 will still, due to the principle of moment, pull the first driven frame 31 to rotate in the direction close to the second driven frame 32.

[0088] Furthermore, when the thrust given by the second abutting portion 45 to the first abutting portion 33 is sufficient, the link frame group 5 and the first driven frame 31 can pull the second driven frame 32 closer to the fixed bracket 1 until the fixed bracket 1, the movable bracket 2, the driven frame group 3, and the link frame group 5 are folded and abutted against each other.

[0089] On the contrary, when the thrust given by the second abutting portion 45 to the first abutting portion 33 is insufficient, the link frame group 5 and the first driven frame 31 cannot pull the second driven frame 32 closer to the fixed bracket 1. At this time, the second driven frame 32 will not move closer to the fixed bracket 1 and will remain stationary in place, and only the movable bracket 2, the driven frame group 3, and the link frame group 5 are folded and abutted against each other.

[0090] However, the slider 42 of the extended pivot device 10 of the present invention can reciprocally slide on the linear slide rail 41, and the elastic component 43 and the damper 44 are elastically supported between the linear slide rail 41 and the slider 42. Therefore, the thrust given by the second abutting portion 45 to the first abutting portion 33 through the elastic component 43 and the damper 44 is in the same line, thereby avoiding the occurrence of force loss caused by component forces, so as to ensure that the thrust given by the second abutting portion 45 to the first abutting portion 33 is sufficient, enabling the fixed bracket 1, the movable bracket 2, the driven frame group 3, and the link frame group 5 to be folded and abutted against each other.

[0091] As Figures 10 to 12 shown in the figure, this is the third usage state of the extended pivot device 10 of the present invention. After the user pulls open the cabinet door and the movable bracket 2 and then releases it, since the distance H between the second driven frame 32 and the passive cam 61 is smaller than the size of the second abutting portion 45, when the second abutting portion 45 moves towards the distance H and abuts against the circular outer periphery 611, the second abutting portion 45 will be blocked between the circular outer periphery 611 and the second driven frame 32. Although the elastic component 43 and the damper 44 continuously push against the second abutting portion 45, since the second abutting portion 45 is blocked by the circular outer periphery 611 and the second driven frame 32, it cannot pull the first driven frame 31 to rotate in the direction close to the second driven frame 32. At this time, the movable bracket 2, the driven frame group 3, and the link frame group 5 will remain stationary in place until the user pushes the cabinet door and the movable bracket 2 to other usage states.

[0092] In addition, when the second abutting portion 45 moves towards the spacing H and abuts against the circular outer periphery 611, the locking and positioning portion 312 is locked with the active link 7, that is, the active link 7 is engaged in the notch 91, which will cause the position of the movable bracket 2 to be locked. The first driven bracket 31 and the first link bracket 51 cannot drive the movable bracket 2 to approach the second driven bracket 32. At this time, the movable bracket 2, the driven bracket group 3 and the link bracket group 5 will remain stationary in place until the user pushes the cabinet door and the movable bracket 2 to other usage states.

[0093] Thus, after the user pulls open the cabinet door and the movable bracket 2 and then releases them, when the second abutting portion 45 abuts against the protruding arc block 612, the movable bracket 2, the driven bracket group 3 and the link bracket group 5 will be folded against each other to achieve the characteristics of slow descent and continuous closing of the extended pivot device 10 within the default range.

[0094] In addition, after the user pulls open the cabinet door and the movable bracket 2 and then releases them, when the second abutting portion 45 moves towards the spacing H and abuts against the circular outer periphery 611, the movable bracket 2, the driven bracket group 3 and the link bracket group 5 will remain stationary in place to achieve the characteristics of stopping as soon as it is opened of the extended pivot device 10 within the default range.

[0095] As Figures 13 to 22 shown, it is another embodiment of the extended pivot device 10 of the present invention. Figures 13 to 22 The embodiment of Figures 1 to 12 is substantially the same as the embodiment of Figures 13 to 22 The difference between the embodiment of Figures 1 to 12 and the embodiment of

[0096] is further described as follows. The movable bracket 2 of this embodiment has a first pivot portion 21' and a second pivot portion 22' which are arranged at intervals. One end of the active link 7 and one end of the first link bracket 51 adjacent to the movable bracket 2 are pivotally connected to the first pivot portion 21' together, and the other end of the active link 7 and one end of the first driven bracket 31 adjacent to the movable bracket 2 are pivotally connected to the second pivot portion 22' together.

[0097] As Figures 14 to 16 shown, it is the first usage state of this embodiment. When the second abutting portion 45 abuts against the protruding arc block 612, the second abutting portion 45 gives a thrust to the protruding arc block 612 through the elastic component 43 and the damper 44, that is, gives a thrust to the first abutting portion 33. Due to the moment principle, it can pull the outer frame 310 and the passive link 6 to rotate towards the direction close to the second driven bracket 32, that is, pull the first driven bracket 31 to rotate towards the direction close to the second driven bracket 32 until the fixed bracket 1 abuts against the movable bracket 2, and the driven bracket group 3, the buffer component 4, the link bracket group 5, the passive link 6, the active link 7, the movable pivot 8 and the active cam 9 are all hidden in the first accommodation space S1 and the second accommodation space S2.

[0098] As Figures 17 to 19 shown, this is the second usage state of this embodiment. After the user pulls open the cabinet door and the movable bracket 2 and then releases it, since the second abutting portion 45 and the protruding arc block 612 still abut against each other, the thrust given by the second abutting portion 45 to the first abutting portion 33 through the elastic component 43 and the damper 44 will still, due to the moment principle, pull the first driven frame 31 to rotate towards the direction close to the second driven frame 32. Moreover, the first driven frame 31 and the first link bracket 51 can drive the movable bracket 2 to approach the second driven frame 32 until the movable bracket 2, the driven frame group 3 and the link frame group 5 are folded and abutted against each other.

[0099] Meanwhile, when the thrust given by the second abutting portion 45 to the first abutting portion 33 is sufficient, the link frame group 5 and the first driven frame 31 can pull the second driven frame 32 towards the fixed bracket 1 until the fixed bracket 1, the movable bracket 2, the driven frame group 3 and the link frame group 5 are folded and abutted against each other.

[0100] As Figures 20 to 22 shown, this is the third usage state of this embodiment. After the user pulls open the cabinet door and the movable bracket 2 and then releases it, since the distance H between the second driven frame 32 and the passive cam 61 is smaller than the dimension of the second abutting portion 45, when the second abutting portion 45 moves towards the distance H and abuts against the circular outer periphery 611, the second abutting portion 45 will be blocked between the circular outer periphery 611 and the second driven frame 32. Although the elastic component 43 and the damper 44 continuously abut against the second abutting portion 45, since the second abutting portion 45 is blocked by the circular outer periphery 611 and the second driven frame 32, it cannot pull the first driven frame 31 to rotate towards the direction close to the second driven frame 32. At this time, the movable bracket 2, the driven frame group 3 and the link frame group 5 will remain stationary in place until the user pushes the cabinet door and the movable bracket 2 to other usage states.

[0101] Thus, compared with Figures 1 to 12 the embodiment of this, although it lacks components such as the movable pivot 8, the locking and positioning portion 312 and the active cam 9, this embodiment still has the functions of slow descent, continuous closing and stopping at any opening.

[0102] In summary, the extended pivot device of the present invention has not been seen in similar products and public use, and has industrial applicability, novelty and creativity, fully meeting the requirements for patent application. Now, an application is filed in accordance with the Patent Law to protect the rights of the inventor.

Claims

1. An extended pivot device, characterized in that, Comprising: A fixed bracket; A movable bracket; A driven frame group, including a first driven frame and a second driven frame pivotally connected at one end. The other end of the first driven frame is pivotally connected to the movable bracket, and the other end of the second driven frame is pivotally connected to the fixed bracket. The first driven frame has a first abutting portion; and A buffer assembly, including a linear slide rail fixed to the second driven frame, a slider reciprocally slidable on the linear slide rail, and an elastic component and a damper elastically supported between the linear slide rail and the slider. One end of the slider away from the linear slide rail has a second abutting portion abutting against the first abutting portion.

2. The extended pivot device according to claim 1, wherein The linear slide rail is a shaft rod fixed to the second driven frame. A groove is recessed along the axial direction of the shaft rod. The slider is a hollow sliding sleeve reciprocally movably sleeved on the shaft rod. One end of the hollow sliding sleeve extends with the second abutting portion, and the other end extends with an extension piece reciprocally movably passing through the groove. The elastic component is accommodated in the hollow sliding sleeve and elastically supported between the shaft rod and the second abutting portion. The damper is accommodated in the hollow sliding sleeve and elastically supported between the shaft rod and the extension piece.

3. The extended pivot device according to claim 2, wherein, The damper has a piston rod abutting against the shaft rod.

4. The extended pivot device according to claim 1, wherein Further comprising a link frame group, the link frame group including a first link bracket and a second link bracket. One end of the first link bracket is pivotally connected to the movable bracket, and the other end is pivotally connected between the two ends of the second link bracket. One end of the second link bracket is pivotally connected to the fixed bracket, and the other end is pivotally connected between the two ends of the first driven frame.

5. The extended pivot device according to claim 4, wherein, The first driven frame includes an outer frame and a passive link. One end of the outer frame is pivotally connected to the second driven frame, and the other end is pivotally connected to the movable bracket. One end of the passive link is pivotally connected to the second driven frame, and the other end is pivotally connected between the two ends of the second link bracket and the outer frame. The first abutting portion is a passive cam extending from one end of the passive link adjacent to the second driven frame, and the passive cam abuts against the second abutting portion.

6. The extended pivot device according to claim 5, characterized in that, The outer peripheral edge of the passive cam has a circular outer periphery. One end of the circular outer periphery away from the outer frame extends with a protruding arc block. When the second abutting portion abuts against the protruding arc block, the second abutting portion can give a thrust to the protruding arc block through the elastic component and the damper, and pull the first driven frame to rotate towards the direction close to the second driven frame.

7. The extended pivot device according to claim 6, wherein, The distance between the second driven frame and the passive cam is smaller than the size of the second abutting portion. When the second abutting portion moves towards the distance and abuts against the circular outer periphery, the second abutting portion will be blocked between the circular outer periphery and the second driven frame.

8. The extended pivot device according to claim 7, wherein, Further includes an active link and a movable pivot. The movable bracket has a first pivot portion and a second pivot portion which are spaced apart and is provided with a long slot. One end of the outer frame adjacent to the movable bracket is provided with a circular hole and has a clamping and positioning portion. One end of the active link and one end of the first link bracket adjacent to the movable bracket are jointly pivotally connected to the first pivot portion. The other end of the active link is pivotally connected to the second pivot portion. The movable pivot is pivotally connected to the long slot and the circular hole, so that the clamping and positioning portion can move along the long slot through the movable pivot. When the second abutting portion abuts against the protruding arc block, the clamping and positioning portion is separated from the active link. When the second abutting portion moves towards the spacing and abuts against the circular outer periphery, the clamping and positioning portion is clamped with the active link.

9. The extended pivot device according to claim 8, wherein, The clamping and positioning portion is an active cam fixedly connected to one end of the outer frame adjacent to the movable bracket and swinging with one end of the outer frame adjacent to the movable bracket. The active cam is provided with a notch, and the active link can be engaged with or disengaged from the notch.

10. The extended pivot device according to claim 5, characterized in that, Further includes an active link. The movable bracket has a first pivot portion and a second pivot portion which are spaced apart. One end of the active link and one end of the first link bracket adjacent to the movable bracket are jointly pivotally connected to the first pivot portion. The other end of the active link and one end of the outer frame adjacent to the movable bracket are jointly pivotally connected to the second pivot portion.

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