A synchronously adjustable double arm and support

Abstract

This utility model relates to a synchronously adjustable double arm and its support. The synchronously adjustable double arm includes two sections, the first and second, both of which are four-bar linkages. A pre-tension spring is installed in one of the arms to maintain the arm's suspended position. The first and second arm sections are connected by an axle at their ends, allowing them to rotate relative to each other to adjust their orientation. A linkage rod passes through the axis, with its two ends sliding or rolling against grooves on the far sides of the first and second arm sections, achieving linkage between the two arms. A suspension assembly and a base assembly are respectively installed at the ends of the arms furthest from the axle connection, forming the complete support. This utility model features a unique design, simple structure, and flexible adjustment operation. In particular, both arms use a four-bar linkage structure with only one pre-tension spring, achieving synchronous adjustment through a linkage rod. During height adjustment, it keeps the suspended equipment on a vertical plane while allowing relative rotation of the two arms to adjust their orientation.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical support technology, and specifically relates to a synchronously adjustable double arm and support, especially a double arm support scheme in which the first arm and the second arm are linked and synchronously adjusted. Background Technology

[0002] Dual-arm stands can support monitors higher and farther, meeting the needs of a wide range of adjustments. They generally have two configurations: One is a combination of a fixed arm and an adjustable arm. The fixed arm handles horizontal adjustment, while the adjustable arm handles vertical adjustment. This structure adds an extra fixed arm and connecting components compared to the traditional single-arm structure, increasing costs. Examples include CN202310119892.6 and CN202380076549.6. The second configuration consists of two adjustable arms, providing even more flexible adjustments. This adds a pre-tensioning spring, undoubtedly increasing costs, as seen in a double four-bar multi-functional stand disclosed in CN201920210989.7.

[0003] The object of this invention is to find a more reasonable technical solution. Summary of the Invention

[0004] The purpose of this invention is to design a synchronously adjustable double arm with the first and second arms linked together, and a support frame composed of the synchronously adjustable double arms.

[0005] The present invention is implemented as follows: a synchronously adjustable double arm, comprising two first and second arms, each with a four-bar linkage structure, and a pre-tension spring in one of the arms to maintain the arm in a suspended position; characterized in that: the first and second arms are connected by an end shaft, and the two can rotate relative to each other to adjust their orientation, and a linkage rod is inserted at the axis, the two ends of which slide or roll against the grooves on the far side of the first and second arms respectively.

[0006] The first arm section includes an upper first arm member, a lower first arm member, an upper first arm end seat, and a lower first arm end seat, which are hinged together to form a four-bar linkage structure; the second arm section includes an upper second arm member, a lower second arm member, an upper second arm end seat, and a lower second arm end seat, which are hinged together to form a four-bar linkage structure; a preload spring is disposed between an adjacent member and end seat in either the first or second arm section.

[0007] The shaft connection refers to the first arm lower end seat being located inside or outside the two hinge shafts and the second arm upper end seat being located outside or inside the two hinge shafts, with a matching shaft hole and shaft protrusion provided between them.

[0008] The shaft protrusion has a circular hole at its center for the linkage rod to pass through. The linkage rod is a circular rod with hemispherical structures at both ends. The sliding groove that matches it has the following two structures: 1. A long groove with a semi-circular cross-section, the axis of which is parallel to the rod on the same side; 2. A spherical notch.

[0009] The groove is either directly formed on the corresponding rod or is a separate component that is fastened to the corresponding rod by screws.

[0010] As a preferred embodiment, the preload spring installed in the second arm has a suspension end and an adjustment end. The suspension end is suspended on the lower rod of the second arm, and the bolt of the adjustment end passes through the through hole of the lower end seat of the second arm, and the bolt abuts against the outer edge of the through hole, which can adjust the preload force.

[0011] The suspension end of the preload spring is suspended on the hinge shaft between the lower rod of the second arm and the upper end seat of the second arm, and the bolt of the adjusting end also passes through the hinge shaft between the upper end seat of the second arm and the upper rod of the second arm.

[0012] A bracket includes a suspension assembly and a base assembly, as well as any of the aforementioned synchronously adjustable double arms; characterized in that: the suspension assembly is rotatably positioned on the upper end seat of the first arm of the first section arm via a shaft, and the lower end seat of the second arm of the second section arm is connected to the base assembly.

[0013] The connection between the lower end of the second arm and the base assembly has the following structure: 1. It is rotatably positioned on the base assembly via a vertical axis; 2. It is directly locked on the base assembly; 3. It is positioned on the support arm attached to the base assembly via a shaft.

[0014] This utility model features a unique design, simple structure, and flexible adjustment operation. In particular, both arms adopt a four-bar linkage structure with only one pre-tension spring. Synchronous adjustment is achieved with the help of a linkage rod. When adjusting the height, the two arms are on the same plane, which can keep the suspended equipment on a vertical plane, while allowing the two arms to rotate relative to each other to meet the adjustment of orientation. Attached Figure Description

[0015] The invention will be further described below with reference to specific figures:

[0016] Figure 1 Diagram of a double-arm support

[0017] Figure 2 Schematic diagram of cross-section of double-arm support

[0018] Figure 3 Exploded view of the dual-arm support

[0019] in

[0020] 1—First arm section; 11—Upper member of the first arm; 12—Lower member of the first arm; 13—41 seat at the upper end of the first arm;

[0021] 14—Lower end seat of the first arm; 141—Shaft hole;

[0022] 2—Second arm section; 21—Upper member of the second arm; 22—Lower member of the second arm; 23—Upper end seat of the second arm;

[0023] 231—Shaft protrusion; 232—Round hole; 24—Lower end seat of the second arm; 241—Through hole;

[0024] 3—Preload spring; 31—Suspension end; 32—Adjusting end; 321—Bolt;

[0025] 4—Linkage rod; 41—Hemispherical structure;

[0026] 5—Hinge; 6—Suspension assembly; 7—Base assembly; 71—Vertical axis;

[0027] 8—Slide groove; Detailed Implementation

[0028] Reference Figure 1 , Figure 2 and Figure 3 The illustration shows a double-arm support, employing synchronously adjustable double arms. These synchronously adjustable double arms include two first arm sections 1 and 2, both of which are four-bar linkages. The ends of the first arm section 1 and the second arm section 2 are connected by a shaft, allowing them to rotate relative to each other to adjust their orientation. A linkage rod 4 passes through the axis, and the two ends of the linkage rod 4 slide or roll against the grooves 8 on the far side of the first arm section 1 and the second arm section 2, respectively, to transmit the preload. A preload spring 3 is installed in one of the first arm sections 1 and 2 to maintain the arm in a suspended position and bear the supporting load.

[0029] More specifically, the first arm section 1 includes: an upper first arm member 11, a lower first arm member 12, an upper first arm end seat 13, and a lower first arm end seat 14, which are hinged together by a hinge pin 5 to form a four-bar linkage structure; the second arm section 2 includes: an upper second arm member 21, a lower second arm member 22, an upper second arm end seat 23, and a lower second arm end seat 24, which are hinged together by a hinge pin 5 to form a four-bar linkage structure; a preload spring 3 is disposed between an adjacent member and an end seat in either the first arm section 1 or the second arm section 2. In this example, the preload spring 3 is disposed on the second arm section 2.

[0030] The shaft connection refers to the first arm lower end seat 14 being located inside or outside the two hinge shafts 5, and the second arm upper end seat 23 being located outside or inside the two hinge shafts 5, with a mating shaft hole 141 and shaft protrusion 231 provided. In this example, the shaft hole 141 is located on the first arm lower end seat 14, and the shaft protrusion 231 is located on the second arm upper end seat 23, and vice versa.

[0031] A concentric circular hole 232 is provided at the center of the shaft protrusion 231. The linkage rod 4 passing through this circular hole 232 is a circular rod and does not affect the rotation of the shaft. The two ends of the linkage rod 4 are hemispherical structures 41, and the sliding groove 8 that mates with it has the following two structures: 1. A long groove with a semi-circular cross-section, the axis of which is parallel to the rod on the same side; 2. A spherical notch. The hemispherical structure 41 of the linkage rod can slide against the sliding groove 8, allowing the two to rotate relative to each other. In addition, the sliding groove 8 can be directly formed on the corresponding rod, or, as shown in the example, can be a separate part and locked to the corresponding rod with screws.

[0032] It must be noted that the optimal solution is to have a circular hole 232 at the center of the shaft protrusion 231 to mate with the circular linkage rod 4, as this does not hinder relative rotation between components and is easy to manufacture. However, it is not ruled out that a square hole could be made at the center of the shaft protrusion to mate with the linkage rod 4, which has a square cross-section, allowing the linkage rod 4 to slide up and down. In this case, ball bearings can be installed at both ends of the linkage rod 4 to allow for multi-angle rotation without hindering relative rotation adjustment between the two arms, achieving the same effect.

[0033] In this example, the shaft protrusion 231 is preferably located on the upper end seat 23 of the second arm for easy assembly, especially when the shaft protrusion 231 has a linkage rod 4 at its center. Furthermore, the shaft hole 141 and the shaft protrusion 231 must be located, one inside the hinge pin 5 and the other outside. Only in this way can the strokes of the two arms complement each other during height adjustment. That is, the linkage rod 4 moves upward as the arms rise and downward as the arms fall, always maintaining contact at both ends with the distant upper rod 11 of the first arm and the lower rod 22 of the second arm to transmit preload. Additionally, once the shaft protrusion 231 is in place, it can be positioned using a retaining spring.

[0034] As a preferred embodiment, the preload spring 3 is disposed within the second arm section 2, resulting in a lower center of gravity and better overall stability. The preload spring 3 has a suspension end 31 and an adjustment end 32. The suspension end 31 is suspended on the lower rod 22 of the second arm, more specifically, on the hinge pin 5 between the lower rod 22 and the upper end seat 23 of the second arm. The bolt 321 of the adjustment end 32 passes through the through hole 241 of the lower end seat 24 of the second arm, and the bolt 321 abuts against the outer edge of the through hole 241, allowing adjustment of the preload force. Furthermore, the bolt 321 of the adjustment end 32 also passes through the hinge pin 5 between the upper end seat 23 and the upper rod 21 of the second arm, making the space more compact without affecting the preload force.

[0035] Based on the aforementioned synchronously adjustable double arms, a complete bracket can be assembled by configuring the corresponding suspension assembly 6 and base assembly 7 to support devices such as monitors. Specifically, the suspension assembly 6 is rotatably positioned on the upper end seat 13 of the first arm of the first section 1 via a shaft. This shaft can be selected as a vertical shaft as shown in the figure, or a horizontal shaft can be used for positioning, depending on the structure of the suspension assembly 6. However, when using a horizontal shaft, a damping structure needs to be added, in which case the corresponding suspension assembly 6 does not need to be designed with a horizontal pivot. The lower end seat 24 of the second arm of the second section is connected to the base assembly 7. Using the base assembly 7, the double arms can be placed on objects such as tabletops, or locked to fixed objects such as walls or ceilings, providing suspended support.

[0036] Therefore, depending on the application, the connection between the lower end seat 24 of the second arm and the base assembly 7 has the following structure:

[0037] 1. As shown in the figure, the arms can be rotatably positioned on the base assembly 7 via the vertical axis 71. The orientation angle can be adjusted using the vertical axis 71 to keep the arms from being misaligned on a vertical plane.

[0038] 2. It is directly locked onto the base assembly 7, which simplifies the structure. The adjustment of the orientation angle can be achieved by using the shaft connection point of the two arms. However, the adjustment will result in the two arms shifting.

[0039] Third, the shaft is positioned on the support arm of the 7-link base assembly. An additional fixed arm can be added to bridge the gap, which can extend the suspension range, making the design more flexible and allowing for different appearances and functions.

Claims

1. A synchronously adjustable double arm, comprising two first arm sections (1) and second arm sections (2), both being four-bar linkages, with a preload spring (3) installed in one of the arms to maintain the arm in a suspended position; characterized in that: The first arm (1) and the second arm (2) are connected by a shaft at their ends. They can rotate relative to each other to adjust their orientation. A linkage rod (4) is inserted through the axis. The two ends of the linkage rod (4) slide or roll against the groove (8) on the far side of the first arm (1) and the second arm (2).

2. The synchronously adjustable double arms according to claim 1, characterized in that: The first arm (1) includes an upper first arm member (11), a lower first arm member (12), an upper first arm end seat (13), and a lower first arm end seat (14), which are hinged together by a hinge shaft (5) to form a four-bar linkage; the second arm (2) includes an upper second arm member (21), a lower second arm member (22), an upper second arm end seat (23), and a lower second arm end seat (24), which are hinged together by a hinge shaft (5) to form a four-bar linkage; a preload spring (3) is provided between adjacent members and end seats in either the first arm (1) or the second arm (2).

3. A synchronously adjustable double arm according to claim 1 or 2, characterized in that: The shaft connection refers to the first arm lower end seat (14) being located inside or outside the two hinge shafts (5) and the second arm upper end seat (23) being located outside or inside the two hinge shafts (5), with a matching shaft hole (141) and shaft protrusion (231).

4. The synchronously adjustable double arms according to claim 3, characterized in that: The shaft of the cam (231) has a circular hole through which the linkage rod (4) passes. The linkage rod (4) is a circular rod with hemispherical structure (41) at both ends or equipped with balls. The sliding groove (8) that cooperates with it has the following two structures:

1. a semi-circular long groove with the axis of the long groove parallel to the rod on the same side; 2. a spherical notch.

5. A synchronously adjustable double arm as described in claim 4, characterized in that: The groove (8) is directly formed on the corresponding rod, or it is a separate part that is fastened to the corresponding rod by screws.

6. A synchronously adjustable double arm according to claim 1 or 2, characterized in that: The preload spring (3) installed in the second arm (2) has a suspension end (31) and an adjustment end (32). The suspension end (31) is suspended on the lower rod (22) of the second arm, and the bolt (321) of the adjustment end (32) passes through the through hole (241) of the lower end seat (24) of the second arm, and the bolt (321) abuts against the outer edge of the through hole (241), which can adjust the preload force.

7. A synchronously adjustable double arm as described in claim 6, characterized in that: The suspension end (31) of the preload spring is suspended on the hinge (5) of the lower rod (22) of the second arm and the upper end seat (23) of the second arm. The bolt (321) of the adjusting end (32) also passes through the hinge (5) of the upper end seat (23) of the second arm and the upper rod (21) of the second arm.

8. A bracket comprising a suspension assembly (6) and a base assembly (7), and the synchronously adjustable double arms as described in any one of claims 1 to 7; characterized in that: The suspension assembly (6) is rotatably positioned on the upper end seat (13) of the first arm of the first arm (1) via a shaft, and the lower end seat (24) of the second arm of the second arm (2) is connected to the base assembly (7).

9. A stent according to claim 8, characterized in that: The lower end seat (24) of the second arm is connected to the base assembly (7) with the following structure:

1. It is rotatably positioned on the base assembly (7) via a vertical shaft (71); 2. It is directly locked on the base assembly (7); 3. The shaft is positioned on the support arm connected to the base assembly (7).

Images