Legs with linkage
Patent Information
- Application Number
- TW114104037
- Authority / Receiving Office
- TW · TW
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-02-04
- Publication Date
- 2026-08-16
- Estimated Expiration
- 2045-02-03
AI Technical Summary
Existing tripods are limited in their ability to support larger objects due to restricted rotation range and interference of support rods, leading to a smaller volume and bearing surface when retracted, and lack smooth extension mechanisms.
A leg with a linkage device featuring a pivot unit, support unit, and linkage, allowing support rods to pivot about a central axis, with lower linkages that rotate relative to the pivot unit, enabling smooth unfolding and a larger bearing surface when extended.
The design achieves smooth unfolding of support rods, supports larger objects, and reduces volume when retracted, enhancing structural strength and ease of use.
Smart Images
Figure TWG2TA001072003_001 
Figure TWG2TA001072003_002 
Figure TWG2TA001072003_003
Abstract
Description
Technical Field
[0001] This invention relates to a support frame, and more particularly to a frame with a linkage device. Prior Technology
[0002] Tripods have a wide range of uses. They can be used to elevate cameras, mobile phones, and measuring instruments and support them on the ground. They can also be fitted with a chair on top for people to sit on.
[0003] A known tripod disclosed in Chinese Patent Publication No. CN220523748U includes a support base, a central rod extending downward from the support base, three pivot seats protruding outward from the support base, three support rods pivotally connected to the support base at their apexes along the tangent direction of the support base, three pivots passing through the corresponding pivot seats and support rods respectively along the tangent direction of the support base, a collar movably fitted onto the central rod, three connecting rods at both ends pivotally connected to the collar and the support rods respectively, and three pivot assemblies respectively disposed on the connecting rods. Each pivot assembly includes two pivot seats and two pivot pins. The pivot seats protrude from the collar and the corresponding support rod. The pivot pins pass through the corresponding connecting rods at both ends and the pivot seats respectively along the tangent direction of the collar.
[0004] In use, pushing the collar downwards extends the connecting rods, allowing the bottom ends of the support rods to open outwards and stand upright on the ground. Moving the collar allows the support rods to be simultaneously extended or retracted via the connecting rods. However, each support rod is pivotally connected to the support base at its top, and to reduce the volume when retracted, the volume of the support base and the area of its top bearing surface are reduced. This results in the tripod only being suitable for mounting small objects such as cameras and mobile phones, which needs improvement.
[0005] Furthermore, when the collar is moved and the support rods are simultaneously extended via the connecting rods, the extension axes of the connecting rods are all directed toward the central axis of the central rod. The range of rotation of the connecting rods relative to the collar is limited, and the extension of the support rods is less smooth. Summary of the Invention
[0006] Therefore, the object of the present invention is to provide a leg with a linkage device that can solve the existing deficiencies.
[0007] Therefore, the leg with linkage of the present invention includes a pivot unit, a support unit, and a linkage. The pivot unit includes a central axis. The support unit is pivotally connected to the pivot unit and includes at least three support rods that can pivot about the central axis respectively. Each support rod has a pivot portion pivotally connected to the pivot unit, a top portion located on one side of the pivot portion, a bottom portion opposite to the top portion and located on the other side of the pivot portion, and a lower pivot portion disposed between the pivot portion and the bottom portion. The top portions and the bottom portions can switch between a retracted state approaching the central axis and an open state away from the central axis. When the top portions are in the open state away from the central axis, they collectively define a bearing surface. The linkage device includes a linkage seat and at least three lower linkages. The linkage seat is located between the support rods. The linkage seat has a main body and at least three pivot members that surround the central axis and are connected to the main body. Each lower linkage has a first end pivotally connected to the corresponding pivot member and a second end pivotally connected to the corresponding lower pivot part along a long axis opposite to the first end. When the linkage seat moves along the central axis and relative to the pivot unit, the top and bottom ends of the support rods can be switched between the closed state and the open state through the lower linkages. When the top and bottom ends of the support rods are in the open state, the long axis of the lower linkages does not face the central axis.
[0008] The advantage of this invention is that, by utilizing the overall configuration, when the top and bottom ends of the support rods change from the retracted state to the extended state, the lower connecting rods can smoothly rotate relative to the connecting seat and the support rods, thus achieving smooth unfolding operation. Simple Explanation of the Diagram
[0009] Other features and effects of the present invention will be clearly presented with reference to the embodiments shown in the figures, wherein: Figure 1 is a perspective view of a first embodiment of the tripod with a linkage device of the present invention, illustrating that the first embodiment is applicable to a platform and a handle to form a cane chair, and the tripod is in an extended position; Figure 2 is a perspective view of the first embodiment in a retracted position, illustrating that the tripod is in a retracted position; Figure 3 is a side view of the first embodiment, illustrating that the tripod is in the extended position; Figure 4 is an incomplete side view of the first embodiment, illustrating that the tripod is in the retracted position; Figure 5 is a cross-sectional view taken along line VV in Figure 4; Figure 6 is a cross-sectional view taken along line VI-VI in Figure 5; Figure 7 is a cross-sectional view taken along line VII-VII in Figure 6; Figure 8 is an incomplete bottom view of Figure 3; Figure 9 is a top view of Figure 3; Figure 10 is an incomplete view of the linkage device of the first embodiment. Figure 11 is a view similar to Figure 7, illustrating a variation of the first embodiment; Figure 12 is a view similar to Figure 7, illustrating another variation of the first embodiment; Figure 13 is a perspective view of a second embodiment of the tripod with linkage device of the present invention; Figure 14 is an incomplete exploded perspective view of the second embodiment; Figure 15 is a perspective view of a linkage seat in Figure 14; Figure 16 is an unfolding operation diagram of the second embodiment; Figure 17 is a perspective view of a third embodiment of the tripod with linkage device of the present invention; and Figure 18 is an incomplete exploded perspective view of the third embodiment. Implementation
[0010] Before the invention is described in detail, it should be noted that similar elements are represented by the same numbers in the following description.
[0011] Referring to Figures 1 and 2, a first embodiment of the tripod with a linkage device of the present invention is suitable for providing a carrier plate 8 and a handle 9. In this embodiment, the carrier plate 8 is a seat for sitting and can be used as a cane chair. This embodiment can also be used as a tripod for cameras, mobile phones, television screens, etc., and is not limited thereto.
[0012] Referring to Figures 3 and 4, the first embodiment includes a pivot unit 1, a support unit 2, and a linkage device 3.
[0013] Referring to Figures 4, 5, and 6, the pivot unit 1 is arranged along a central axis L and is in the shape of a short cylinder. The pivot unit 1 includes a top surface 11, a bottom surface 12 arranged opposite to the top surface 11 along the central axis L, a peripheral surface 13 connecting the peripheries of the top surface 11 and the bottom surface 12, three limiting holes 14 extending from the top surface 11 to the bottom surface 12 and spaced apart around the central axis L, three pivots 17 spaced apart around the central axis L and respectively passing through the corresponding limiting holes 14, and a receiving groove 16 recessed from the bottom surface 12. Each limiting hole 14 is defined by a hole surrounding surface 15. Each hole surrounding surface 15 has a limiting surface 151 adjacent to the central axis L and two end surfaces 152 respectively connected to the two ends of the limiting surface 151 and facing each other.
[0014] The support unit 2 is pivotally connected to the pivot seat unit 1 and includes three support rods 201 that are pivotable about the central axis L and pass through the limiting holes 14. Each support rod 201 has a pivot portion 21 pivotally connected to the corresponding pivot 17, a top portion 22 located on one side of the pivot portion 21 and above the top surface 11, a bottom portion 23 opposite to the top portion 22 and located on the other side of the pivot portion 21, a lower pivot portion 24 disposed between the pivot portion 21 and the bottom portion 23, and a rod surface 25 facing the corresponding limiting surface 151. Each pivot portion 21 can pivot between the end surfaces 152 along the corresponding limiting surface 151. As shown in FIG9, the lower pivot portion 24 of each support rod 201 has a rod-shaped pivot pin 241, and a pivot axis L3 passes through the corresponding pivot pin 241 and is perpendicular to the rod surface 25. The pivot axis L1 of each support rod 201 and the pivot 17 of the pivot unit 1 is substantially perpendicular to the central axis L and the corresponding rod surface 25 (see Figure 5). The top portions 22 and the bottom portions 23 can switch between a closed state approaching the central axis L and an open state away from the central axis L. When the top portions 22 are in the open state away from the central axis L, they collectively define a bearing surface S (see Figure 3).
[0015] Referring to Figures 3, 6 and 7, the linkage device 3 is connected to the support rods 201 and includes a linkage seat 31, an extension rod 32, an elastic element 33 and three lower linkages 34.
[0016] Referring to Figures 7, 8, and 10, the connecting seat 31 is located below the pivot unit 1 and between the support rods 201, and has a main seat body 301 and three pivot members 302 surrounding the central axis L and connected to the main seat body 301. The main seat body 301 has a generally triangular outline perpendicular to the central axis L and has several seat sides 311 facing the surfaces 25 of the rods. Each pivot member 302 has a pin 312 extending outward from the main seat body 301 along a corresponding pivot axis L2 and passing through the corresponding lower connecting rod 34, and a stop portion 313 intersecting and connecting with the outer end of the pin 312 to form an L-shape. Referring to Figure 7, in this embodiment, none of the pivot axes L2 are connected to the central axis L. In other variations, as shown in Figure 11, the outline of the main body 301 perpendicular to the central axis L is also generally triangular, but the pivoting axes L2 are connected to the central axis L. Alternatively, as shown in Figure 12, the outline of the main body 301 perpendicular to the central axis L is generally quadrilateral, and the pivoting axes L2 are connected to the central axis L.
[0017] The extension rod 32 extends along the central axis L. The bottom end of the extension rod 32 is connected to the linkage seat 31, and the top end of the extension rod 32 is connected to the carrier plate 8. Pulling the carrier plate 8 can move the extension rod 32.
[0018] The elastic element 33 is compressibly fitted onto the extension rod 32, and the two opposite ends of the elastic element 33 abut against the elastic elements 33 of the pivot unit 1 and the linkage seat 31, respectively. The top end of the elastic element 33 is received in the receiving groove 16. The elastic element 33 provides a potential energy that constantly pushes the linkage seat 31 away from the pivot unit 1 (downward).
[0019] Referring to Figures 7, 8, and 9, each lower connecting rod 34 has a first end 341 pivotally connected to the corresponding pivot member 302, and a second end 342 pivotally connected to the corresponding lower pivot portion 24 along a longitudinal axis X1 opposite to the first end 341. As shown in Figure 10, the first end 341 has a first pivot hole 343 through which the corresponding pivot member 302 passes. The first pivot hole 343 has a shaft hole area 344 whose outer contour matches the pin 312, and a hook hole area 345 communicating with the shaft hole area 344 and whose outer contour matches the stop portion 313. As shown in Figure 3, the second end 342 has a second pivot hole 346 pivotally connected to the pin member 241.
[0020] When the linkage seat 31 moves along the central axis L and relative to the pivot unit 1, the top end 22 and bottom end 23 of the support rods 201 can be switched between the closed state and the open state through the lower linkage 34. When the top end 22 and bottom end 23 of the support rods 201 are in the open state, the long axis X1 of the lower linkage 34 does not face the central axis L.
[0021] To further understand the effects of the combination of the various components of the present invention, the technical means employed, and the expected results, the following explanation will be provided, which will hopefully lead to a deeper and more specific understanding of the present invention.
[0022] Referring to Figures 3, 4, 6, and 8, the support rods 201 are pivotable relative to the pivot unit 1 between a retracted position (see Figure 4) and an extended position (see Figure 3). In the retracted position, as shown in Figures 4 and 6, the top end 22 of the support rods 201 approaches the central axis L, the bottom end 23 of the support rods 201 approaches the central axis L, the linkage seat 31 is adjacent to the pivot unit 1 in the direction of the central axis L, and the longitudinal axis X1 of each support rod 201 and its corresponding lower connecting rod 34 extends substantially in the direction of the central axis L.
[0023] In this unfolded position, as shown in Figures 3 and 8, the top ends 22 of the support rods 201 are located away from the central axis L, collectively defining the bearing surface S. The bottom ends 23 of the support rods 201 are also located away from the central axis L. The connecting seat 31 is located away from the pivot unit 1 in the direction of the central axis L, and each lower connecting rod 34 is angularly connected to its corresponding support rod 201 and extension rod 32. The bearing surface S is used to support the carrier plate 8. The top end of the extension rod 32 is connected to the carrier plate 8.
[0024] In this embodiment, each pivot axis L1 is substantially perpendicular to the central axis L and the corresponding rod surface 25 (see Figure 5). When the support rods 201 are extended, their top ends 22 can be misaligned without interfering with each other, and together define a larger area of the bearing surface S. In contrast, in the prior art, the support rods 201 are pivotally connected to the support base at their top ends, and the volume of the support base and the area of its top bearing surface S are smaller. Furthermore, in the prior art, each pin passes through the corresponding support rod and pivot base along the tangential direction of the support base. If the top end of each support rod protrudes from the top surface of the support base, the support rods will interfere with each other above the support base, thus failing to achieve the effect of this embodiment. Moreover, in the prior art, the pivot base consists of a collar and a support rod protruding outwards, and the pivot pin passes through the connecting rod and pivot base along the tangential direction of the pivot base. In this embodiment, each pivot axis L2 is perpendicular to the central axis L and the corresponding seat side 311, and each pivot axis L3 is perpendicular to the corresponding rod surface 25. That is, each pivot axis L2 and each pivot axis L3 passes directly through each lower connecting rod 34 along the thickness direction of each lower connecting rod 34. Besides allowing the lower connecting rods 34 to unfold with the support rods 201 in a staggered manner, this also improves the structural strength of the support rods 201 in the unfolded position. Furthermore, this embodiment eliminates the pivot seat in the prior art and reduces the distance between the connecting seat 31 and each support rod 201 in the retracted position. This not only simplifies the structure but also reduces the volume when retracted. In addition, each pivot axis L2 is perpendicular to the central axis L and the corresponding seat side 311, allowing each lower connecting rod 34 to pivot against the connecting seat 31. Therefore, in this embodiment, lower connecting rods 34 with lower thickness and width can be selected, further reducing the size and weight of the lower connecting rods 34.
[0025] In this embodiment, the extension rod 32 extends upward from the linkage seat 31 and its top end connects to the carrier plate 8 on the bearing surface S. Pulling the carrier plate 8 will cause the extension rod 32 to pull the linkage seat 31 up and down, and simultaneously cause the lower connecting rods 34 to pivot, thereby causing the support rods 201 to unfold or retract simultaneously, which is more convenient to use. When it is necessary to unfold the support rods 201, one of the support rods 201 can be pivoted outward relative to the pivot unit 1, causing one of the lower connecting rods 34 to pivot and pull the linkage seat 31 downward, while simultaneously causing the other two lower connecting rods 34 to pivot and unfold. Each support rod 201 and each lower connecting rod 34 pivot relative to each other in a scissor-like manner, which can move the support rods 201 from the retracted position to the unfolded position. The elastic element 33 of the linkage device 3 can store potential energy in the retracted position. When the carrier plate 8 or one of the support rods 201 is pulled, the elastic element 33 releases the potential energy, assisting the linkage seat 31 to move downward and drive the lower connecting rods 34 to unfold, making it easier to move the support rods 201 from the retracted position to the unfolded position. In other variations, the extension rod 32, the elastic element 33, and the receiving groove 16 can also be omitted, achieving the same effect of moving the support rods 201 between the retracted and unfolded positions simply by moving one of the support rods 201.
[0026] This invention, by having each pivot axis L1 substantially perpendicular to the central axis L and the corresponding rod surface 25, allows the top portions 22 to collectively define a larger bearing surface S when the support rods 201 are extended, thus enabling support for a larger volume and weight of the carrier plate 8 (as shown in Figure 1, the chair seat). Furthermore, by having each pivot axis L2 perpendicular to the central axis L and the corresponding seat side 311, and each pivot axis L3 perpendicular to the corresponding rod surface 25, the lower connecting rods 34 can pivot with the support rods 201, increasing the structural strength of the support rods 201 when extended. Therefore, the objective of this invention is indeed achieved.
[0027] As shown in Figures 13 and 14, a second embodiment of the leg frame with a linkage device of the present invention also includes a pivot unit 1, a support unit 2, and a linkage device 3. The following description focuses only on the parts that differ from the first embodiment.
[0028] The lower pivot portion 24 of each support rod 201 of the support unit 2 also has a limiting disc 242 connected to the pivot rod 241 and enlarged relative to the pivot rod 241.
[0029] The linkage device 3 includes a linkage seat 31, an extension rod 32, an elastic element 33, and three lower linkages 34.
[0030] The linkage seat 31 has a main seat body 301 and three pivot members 302 that surround the central axis L and are connected to the main seat body 301.
[0031] As shown in Figure 15, the pin 312 of each pivot member 302 is L-shaped and has a connecting end 314 connected to the corresponding seat side 311, and an end portion 315 intersecting and connecting the connecting end 314 and the stop portion 313. The end portion 315 has a pair of guide slopes 318 adjacent to the stop portion 313, and the guide slopes 318 cause the end portion 315 to gradually taper as it extends toward the connecting end 314. The connecting end 314 of each pivot member 302 is pivot-shaped and intersecting and connecting to the seat side 311. The end portion 315 intersects and connects to the connecting end 314 in an L-shape, and the stop portion 313 is connected to the end portion 315 in an L-shape.
[0032] Each lower connecting rod 34 has a first pivot hole 343 that is elongated, and has a fan-shaped shaft hole area 344 and an arched hook hole area 345 opposite to the shaft hole area 344. The diameter of the hook hole area 345 is not less than that of the connecting end 314, and the diameter of the widest part of the shaft hole area 344 is not less than that of the end portion 315. Each lower connecting rod 34 has a second pivot hole 346 with a diameter larger than that of the outer diameter of the pivot pin 241, and the diameter of the second pivot hole 346 is smaller than that of the limiting plate 242.
[0033] When the linkage seat 31 moves along the central axis L and relative to the pivot unit 1, the linkage seat 31 can drive the lower connecting rods 34 to rotate relative to the linkage seat 31 and the corresponding support rod 201, and the first end 341 of each lower connecting rod 34 is stopped by the stop portion and slides between the connecting end 314 and the end portion 315. The second end 342 of each lower connecting rod 34 pivots relative to the pin member 241 of the corresponding lower pivot portion 24 and is restricted by the corresponding limiting plate 242 and will not disengage from the pin member 241. Meanwhile, as shown in Figure 14, and in conjunction with the action diagrams in Figures 16(A) to 16(C), the connecting seat 31 will rotate around the central axis L due to the rotation of the support rods 201 around the central axis L, the pulling of the lower connecting rods 34 by the support rods 201, and the pulling of the connecting seat 31 by the lower connecting rods 34. In this way, the pivoting action of the support rods 201 relative to the pivot unit 1 can be made smoother.
[0034] When the support rods 201 are retracted toward the central axis L, the end portion 315 of each pivot member 302 has the guide slope 318, and the first pivot hole of the lower connecting rod 34 is guided by the fan-shaped shaft hole area 344, so that the connecting seat 31 can rotate back to the original angle around the central axis L.
[0035] The same purpose and effect as the first embodiment can be achieved by using the overall structure of the second embodiment.
[0036] As shown in Figures 17 and 18, the difference between a third embodiment of the tripod with a linkage device of the present invention and the second embodiment is that:
[0037] The main body 301 of the linkage device 3 has a circumferential surface 316 surrounding the central axis L, and at least three lugs 317 connected to the circumferential surface 316. The connecting end 314 of each pivot member 302 is pivot-shaped and intersectingly connected to the lug 317. The end portion 315 is arranged opposite to the connecting end 314 along a center line L4, which is substantially perpendicular to the central axis L. The disc-shaped stop portion 313 is inclinedly connected to the center line L4. The first pivot hole 343 of each lower connecting rod 34 is circular, and the diameter of the first pivot hole 343 is larger than that of the connecting end 314 and smaller than that of the stop portion 313. The second pivot hole 346 of each lower connecting rod 34 is circular and the diameter is smaller than that of the limiting disc 242.
[0038] The same purpose and effect as the above embodiments can be achieved by using the overall structure of this third embodiment.
[0039] In summary, the leg frame of the present invention with linkage device 3 has a simple overall structure, can form a large bearing area, and the expansion and contraction of the support rods 201 are smooth, thus achieving the purpose of the present invention.
[0040] However, the above description is merely an embodiment of the present invention and should not be construed as limiting the scope of the present invention. Any simple equivalent changes and modifications made in accordance with the scope of the patent application and the contents of the patent specification of the present invention shall still fall within the scope of the patent of the present invention.
[0041] 1: Pivot Unit
[0042] 11: Top surface
[0043] 12: Bottom surface
[0044] 13: Outer perimeter
[0045] 14: Limiting hole
[0046] 15: Hole Surrounding Surface
[0047] 151: Limited Facial Position
[0048] 152: End face
[0049] 16: Receiving slot
[0050] 17: Pivot
[0051] 2: Support unit
[0052] 201: Support rod
[0053] 21: Pivot section
[0054] 22: Top part
[0055] 23: Bottom end
[0056] 24: Lower pivot section
[0057] 241: Shaft pin member
[0058] 242: Limiting plate
[0059] 25: Rod surface
[0060] 3: Linkage device
[0061] 301: Main Body
[0062] 302: Pivot
[0063] 31: Linkage seat
[0064] 311: Side of the seat
[0065] 312: Pin
[0066] 313: hook part
[0067] 314: Connecting end
[0068] 315: terminal part
[0069] 316: Circumferential surface
[0070] 317: Pivot Ear
[0071] 318: Guide sloping surface
[0072] 32: Extension rod
[0073] 33: Elastic component
[0074] 34: Lower Link
[0075] 341: First end
[0076] 342: Second end
[0077] 343: First pivot hole
[0078] 344: Shaft Hole Area
[0079] 345: Hook hole area
[0080] 346: Second pivot hole
[0081] 8: Carrier board
[0082] 9: Handle
[0083] L: Central axis
[0084] L1: Pivot axis
[0085] L2: Pivotal axis
[0086] L3: Pivotal Axis
[0087] L4: Centerline
[0088] X1: Long axis
[0089] S: Bearing surface
Claims
1. A leg with a linkage mechanism, comprising: a pivot unit including a central axis; a support unit pivotally connected to the pivot unit and including at least three support rods pivotally rotatable about the central axis, each support rod having a pivot portion pivotally connected to the pivot unit, a top portion located on one side of the pivot portion, a bottom portion opposite to the top portion and located on the other side of the pivot portion, and a lower pivot portion disposed between the pivot portion and the bottom portion, the top portions and the bottom portions being convertible between a retracted state approaching the central axis and an extended state away from the central axis, the top portions collectively defining a bearing surface in the extended state away from the central axis; and a linkage mechanism including a linkage seat and at least The three lower links are located between the support rods. The lower link has a main body and at least three pivot members that surround the central axis and are connected to the main body. Each lower link has a first end pivotally connected to the corresponding pivot member and a second end pivotally connected to the corresponding lower pivot part along a long axis opposite to the first end. When the lower link moves along the central axis and relative to the pivot unit, the top and bottom ends of the support rods can be switched between a closed state and an open state through the lower links. When the top and bottom ends of the support rods are in the open state, the long axis of the lower links does not face the central axis.
2. The tripod with a linkage as described in claim 1, wherein, Each pivot member of the linkage device has a connecting end connected to the main body, an end portion connected to the connecting end, and a stop portion disposed at the end portion. When the linkage seat moves along the central axis and relative to the pivot unit, it can drive the lower connecting rods to rotate relative to the linkage seat and the corresponding support rod, and cause the first end of each lower connecting rod to slide between the connecting end and the end portion by the stop portion, and the second end of each lower connecting rod to pivot relative to the corresponding lower pivot portion.
3. The tripod with a linkage as described in claim 2, wherein, The main body of the linkage device has a plurality of seat sides surrounding the central axis. The connecting end of each pivot member is pivot-shaped and intersecting with the corresponding seat side. The end portion intersects with the connecting end in an L-shape. The stop portion is connected to the end portion in an L-shape. The first end of each lower link has a first pivot hole with a diameter larger than the width diameter of the connecting end and the end portion.
4. The tripod with a linkage as described in claim 3, wherein, Each pivot member of the linkage has a pair of guide ramps adjacent to the stop portion at its end. These guide ramps cause the end portion to gradually taper as it extends toward the connecting end. The first pivot hole of each lower link is elongated. The first pivot hole has a fan-shaped shaft hole area and an arched hook hole area opposite to the shaft hole area. The diameter of the hook hole area is not less than that of the connecting end, and the diameter of the widest part of the shaft hole area is not less than that of the end portion.
5. The tripod with a linkage as described in claim 2, wherein, The main body of the linkage has a plurality of seat sides surrounding the central axis, and at least three lugs respectively connected to the corresponding seat sides. The connecting end of each pivot member is in the shape of a pivot rod and is intersectingly connected to the lug. The end portion and the connecting end are arranged opposite to each other along a center line. The center line is substantially perpendicular to the central axis. The stop portion is inclinedly connected to the center line.
6. The tripod with a linkage as described in claim 5, wherein, The first pivot hole of each lower link of the linkage device is circular, and the diameter of the first pivot hole is larger than that of the connecting end.
7. A tripod with a linkage as described in claim 3 or claim 5, wherein, Each support rod of the support unit has a lower pivot portion with a rod-shaped pin connected to the corresponding support rod and a limiting plate connected to the pin and enlarged relative to the pin. The second end of each lower connecting rod has a second pivot hole with a diameter larger than the outer diameter of the pin, and the diameter of the second pivot hole is smaller than that of the limiting plate.
8. The tripod with a linkage as described in claim 1, wherein, The bearing surface is suitable for mounting a carrier plate. The linkage device also includes an extension rod extending from the linkage seat toward the carrier plate along the central axis. The top end of the extension rod is connected to the carrier plate. Pulling the carrier plate can activate the linkage device and cause the support rods to unfold or retract simultaneously.
9. The tripod with a linkage as described in claim 8, wherein, The linkage also includes an elastic element that can be compressed and sleeved on the extension rod, with its two ends respectively abutting against the pivot unit and the linkage seat.
10. The tripod with a linkage as described in claim 9, wherein, The pivot unit also has a downward-facing receiving groove for receiving the top end of the elastic member.