Support cantilever structure

Abstract

The invention relates to a bracket cantilever structure. A cantilever main body comprises an upper arm, a lower arm, a first seat body, a second seat body and a spring assembly, the upper arm, the lower arm, the first seat body and the second seat body are hinged to form a four-connecting-rod structure, and the suspension position of the cantilever body is maintained through the spring assembly. The first end of the spring assembly is movably connected with the first seat body, and the second end of the spring assembly is movably hinged to the triangular connecting rod set. The triangular connecting rod set comprises a swing rod and a traction rod, the ends of the swing rod and the traction rod are hinged together through an included angle hinge shaft, the other end of the traction rod is hinged to the upper arm through an upper hinge shaft, and the other end of the swing rod is hinged to the lower arm through a lower hinge shaft. The spring assembly is directly hinged to the included angle hinged shaft or hinged to the swing rod through a fourth hinged shaft. The second end of the spring assembly is hinged to the included angle of the triangular connecting rod set, the position of the hinge point can be changed along with large-angle lifting or drooping of the cantilever, and the distance between the first end and the second end of the spring assembly is kept relatively stable.

Description

Technical fields:

[0001] This invention belongs to the field of adjustable support technology, and specifically relates to a cantilever structure for a support, particularly a solution that enables large pitch angle adjustment. Background technology:

[0002] Adjustable monitor stands have long been widely used in industrial and consumer applications, providing users with more ergonomic operating and viewing angles. Most of these stands employ a parallel four-bar linkage mechanism, relying on spring force to maintain the hovering angle. However, the spring force is typically adjusted to the torque required to maintain the horizontal hovering position. When the arm is adjusted to its pitch limit, the change in the distance between the spring's two fulcrums causes stretching or compression, resulting in a sharp increase or decrease in spring force. Often, when adjusted to the highest point, the arm droops downwards, while at the lowest point, it rebounds upwards. This limited adjustability restricts its application scenarios. To address this, manufacturers have made the following improvements:

[0003] For example, patent application number CN2014108381463 discloses a monitor bracket spring arm, including an arm body and a spring assembly. The arm body includes an upper cover, a lower cover, an upper shaft seat, a lower shaft seat, and a spring assembly, which are hinged together to form a four-bar linkage. The spring assembly is built between the upper and lower covers, with one end abutting against the cam surface of the lower shaft seat via a pulley, and the other end adjusting the contact force via a bevel gear pair. By abutting against the cam surface at one end, the spring assembly shortens the travel difference when the arm is adjusted from the horizontal to the pitch limit position, that is, it minimizes the change in the length of the spring in the spring assembly. However, the difference in the cam radius is still limited, and it only plays an improvement role, but it is difficult to completely overcome the defects in the existing technology structure.

[0004] The object of this invention is to provide a solution for the spring assembly to have a relatively constant spring force during the adjustment process of the support arm. Summary of the Invention:

[0005] The purpose of this invention is to develop a support cantilever structure in which one end of a spring assembly follows the pitch change of the cantilever via a triangular linkage.

[0006] The technical solution of this invention is implemented as follows: a cantilever structure, the cantilever body including an upper arm, a lower arm, a first seat, a second seat, and a spring assembly; the upper arm, lower arm, first seat, and second seat are hinged to form a four-bar linkage structure, and the upper arm and lower arm enclose each other to form a spring cavity that can accommodate the spring assembly, the spring assembly maintaining the cantilever body in a suspended position; characterized in that: the spring assembly has a first end and a second end, the first end is movably connected to the first seat, and the second end is movably hinged to a triangular linkage group; the triangular linkage group includes a swing rod and a traction rod whose ends are hinged together by an included-angle hinge, the other end of the traction rod is hinged to the upper arm by an upper hinge, and the other end of the swing rod is hinged to the lower arm by a lower hinge; the spring assembly is directly hinged to the included-angle hinge, or hinged to the swing rod by a fourth hinge.

[0007] The distance between the lower hinge axis and the fourth hinge axis of the swing rod is greater than the distance between the lower hinge axis and the included angle hinge axis, and the fourth hinge axis is located inside the line connecting the included angle hinge axis and the lower hinge axis.

[0008] The swing arm is a groove-shaped sheet metal part, which is clamped at one end of the spring assembly. The traction rod consists of two separate metal plates, which are respectively attached to both sides of the swing arm and are correspondingly hinged to both sides of the upper arm through segmented upper hinge shafts.

[0009] The movable connection between the first end of the spring assembly and the first seat body refers to the connection through an adjustment mechanism. The adjustment mechanism includes an adjustment bolt disposed on one side of the first seat body and a nut seat movably connected to the first end of the spring assembly. The nut seat is threadedly engaged with the adjustment bolt and can be driven to move by the adjustment bolt.

[0010] The first base is a sheet metal part, including two symmetrical inner and outer bent pieces. Each of the four bent pieces has a folded edge and a vertical edge. The folded edges of the inner and outer bent pieces overlap, and there is a gap between the vertical edges. The overlapping folded edges are welded together and form mounting holes. The vertical edges of the inner bent pieces are also formed with symmetrical long grooves. The two vertical edges are locked together with a gap, and bridging pieces are provided at both ends of the gap. The adjusting bolt passes through the gap formed by the two vertical edges. The adjusting bolt and the positioning nut can rotate and abut against the outer surfaces of the two bridging pieces. The short pins on both sides of the nut seat with the threaded engagement of the adjusting bolt are respectively inserted into the long groove to constrain the nut seat to rotate. The two vertical edges of the outer bent pieces are used to hinge the upper arm and the lower arm.

[0011] The short pins on both sides of the nut seat suspend a U-shaped piece on the outside of the vertical edge of the inner bent piece, and the bottom of the U-shaped piece is connected to the first end of the spring assembly.

[0012] This invention utilizes the included angle of a triangular linkage to hinge the second end of a spring assembly, so that when the cantilever is raised or lowered at a large angle, the distance between the first and second ends of the spring assembly remains relatively stable, maintaining a relatively constant spring force. This ensures that the support arm does not sag when adjusted to the highest point and does not rebound when adjusted to the lowest point, meeting the needs of special scenarios. Attached image description:

[0013] The invention will be further described below with reference to specific figures:

[0014] Figure 1 Schematic diagram of the cantilever structure of the support.

[0015] Figure 2 A front view of the cantilever structure.

[0016] Figure 3 Exploded view of the cantilever structure

[0017] Figure 4 Top view of the cantilever structure

[0018] Figure 5 for Figure 4 Schematic diagram of section A-A

[0019] Figure 6 Schematic diagram of the lifting angle of the cantilever structure.

[0020] Figure 7 Schematic diagram of the descent angle of the cantilever structure.

[0021] in

[0022] 1—Upper arm;

[0023] 2—Lower arm;

[0024] 3—First base; 31—Inner bent piece; 32—Outer bent piece; 33—Bent foot edge; 331—Mounting hole;

[0025] 34—Vertical edge; 341—Long slot; 35—Interval; 36—Bridging piece;

[0026] 4—Second seat;

[0027] 5—Spring assembly; 51—First end; 52—Second end; 53—U-shaped piece;

[0028] 6—Triangular linkage; 61—Swing rod; 62—Traction rod; 63—Including hinge pin; 64—Upper hinge pin;

[0029] 65—Lower hinge shaft; 66—Fourth hinge shaft;

[0030] 7—Adjusting mechanism; 71—Adjusting bolt; 72—Nut seat; 721—Short pin; 73—Positioning nut; Detailed implementation method:

[0031] Reference Figures 1 to 7 The bracket cantilever structure includes an upper arm 1, a lower arm 2, a first seat 3, a second seat 4, and a spring assembly 5. The upper arm 1, lower arm 2, first seat 3, and second seat 4 are hinged to form a four-bar linkage, and the upper arm 1 and lower arm 2 enclose each other to form a spring cavity that can accommodate the spring assembly 5. The spring assembly 5 has a first end 51 and a second end 52. The first end 51 is movably connected to the first seat 3, and the second end 52 is movably hinged to the triangular linkage group 6. The spring assembly 5 maintains the cantilever body in a suspended position, that is, the self-positioning of the cantilever body.

[0032] The triangular linkage assembly 6 includes a swing rod 61 and a traction rod 62, the ends of which are hinged together by an angled hinge pin 63. The other end of the traction rod 63 is hinged to the upper arm 1 by an upper hinge pin 64, and the other end of the swing rod 61 is hinged to the lower arm 2 by a lower hinge pin 65, forming an angle that allows the angled hinge pin 63 to change with the pitch adjustment of the cantilever body. The spring assembly 5 is directly hinged to the angled hinge pin 63, or hinged to the swing rod 61 by a fourth hinge pin 66. This example uses the fourth hinge pin 66. The purpose of using the fourth hinge pin 66 is to expand the range of change. Specifically, the distance between the lower hinge pin 65 and the fourth hinge pin 66 is greater than the distance between the lower hinge pin 65 and the angled hinge pin 63, and the fourth hinge pin 66 is located inside the line connecting the angled hinge pin 63 and the lower hinge pin 65. The triangular linkage assembly 6 changes with the adjustment of the cantilever body, such as... Figure 5 For horizontal state, Figure 6 To raise the highest position, Figure 7 This is the lowest descending state.

[0033] Furthermore, the swing rod 61 is a groove-shaped sheet metal part, which is clamped at one end of the spring assembly 5. The traction rod 62 consists of two separate metal plates, which are respectively attached to both sides of the swing rod 61 and are correspondingly hinged to both sides of the upper arm 1 through the segmented upper hinge shaft 64, leaving space for the swing of the spring assembly 5 in the middle.

[0034] The movable connection between the first end 51 of the spring assembly and the first seat 3 refers to the connection via the adjusting mechanism 7, which allows for adjustment of the preload to meet different load-bearing requirements, such as... Figure 3 .

[0035] The adjustment mechanism 7 includes an adjustment bolt 71 and a nut seat 72. The adjustment bolt 71 is located on one side of the first base 3. The nut seat 72 is used to position the first end 51 of the spring assembly. The nut seat 72 is threadedly engaged with the adjustment bolt 71 and can be driven to move by the adjustment bolt 71, that is, to move the first end 51 of the spring assembly to change the distance with the second end 52.

[0036] Furthermore, the first body 3 is a sheet metal part, including two symmetrical inner bent pieces 31 and outer bent pieces 32. Each of the four bent pieces has a bent edge 33 and a vertical edge 34. The bent edges 33 of the inner and outer bent pieces overlap, and there is a gap between the vertical edges 34. The overlapping bent edges 33 are welded together and form mounting holes 331. The vertical edges 34 of the inner bent pieces are also formed with symmetrical long grooves 341. The two vertical edges are locked together with a gap 35, and bridging pieces 36 are provided at both ends of the gap 35. The adjusting bolt 71 passes through the gap 35 formed by the two vertical edges. The adjusting bolt 71 and the positioning nut 73 can rotate and abut against the outer surfaces of the two bridging pieces 36, that is, they abut against the two bridging pieces 36 through the bearings on both ends. The short pins 721 on both sides of the nut seat 72 with the threaded engagement of the adjusting bolt 71 are respectively inserted into the long groove 341 to constrain the nut seat 72 to rotate.

[0037] The two vertical edges 34 of the outer bending plate are used to hinge the upper arm 1 and the lower arm 2. More specifically, the upper arm 1 and the lower arm 2 are both hinged to each other on the two sides using segmented shafts, leaving space in the middle for the adjustment mechanism 7. Of course, casting is also an option.

[0038] Using the short pins 721 on both sides of the nut seat, a U-shaped piece 53 is suspended on the outside of the vertical edge 34 of the inner bent piece. The bottom of the U-shaped piece 53 is connected to the first end 51 of the spring assembly. This utilizes the gap between the two vertical edges of the inner bent piece 31 and the outer bent piece 32.

Claims

1. A cantilever structure, the cantilever body comprising an upper arm (1), a lower arm (2), a first seat (3), a second seat (4), and a spring assembly (5); the upper arm (1), lower arm (2), first seat (3), and second seat (4) are hinged to form a four-bar linkage, and the upper arm (1) and lower arm (2) together form a spring cavity capable of accommodating the spring assembly (5), the spring assembly (5) maintaining the cantilever body in a suspended position; characterized in that: The spring assembly (5) has a first end (51) and a second end (52). The first end (51) is movably connected to the first seat (3), and the second end (52) is movably hinged to the triangular linkage assembly (6). The triangular linkage assembly (6) includes a swing rod (61) and a traction rod (62) whose ends are hinged together by a hinge pin (63). The other end of the traction rod (62) is hinged to the upper arm (1) by an upper hinge pin (64), and the other end of the swing rod (61) is hinged to the lower arm (2) by a lower hinge pin (65). The spring assembly (5) is directly hinged to the hinge pin (63) or hinged to the swing rod (61) by a fourth hinge pin (66).

2. The cantilever structure of the support according to claim 1, characterized in that: The distance between the lower hinge (65) and the fourth hinge (66) of the swing rod (61) is greater than the distance between the lower hinge (65) and the included angle hinge (63), and the fourth hinge (66) is located inside the line connecting the included angle hinge (63) and the lower hinge (65).

3. A cantilever structure for a support according to claim 1 or 2, characterized in that: The swing rod (61) is a groove-shaped sheet metal part, which is clamped at one end of the spring assembly (5). The traction rod (62) consists of two separate metal pieces, which are attached to both sides of the swing rod (61) and are correspondingly hinged to both sides of the upper arm (1) through the segmented upper hinge shaft (64).

4. The cantilever structure of the support according to claim 1, characterized in that: The movable connection between the first end (51) of the spring assembly and the first seat (3) refers to the connection through the adjustment mechanism (7), which includes an adjustment bolt (71) provided on one side of the first seat (3) and a nut seat (72) movably connected to the first end (51) of the spring assembly. The nut seat (72) is threadedly engaged with the adjustment bolt (71) and can be driven to move by the adjustment bolt (71).

5. A cantilever structure for a support according to claim 1 or 4, characterized in that: The first body (3) is a sheet metal part, including two symmetrical inner bent pieces (31) and outer bent pieces (32). All four bent pieces have folded edges (33) and vertical edges (34). The folded edges (33) of the inner bent pieces (31) and the outer bent pieces (32) overlap, and there is a gap between the vertical edges (34). The overlapping folded edges (33) are welded together and formed with mounting holes (331). The vertical edges (34) of the inner bent pieces are also formed with symmetrical long grooves (341). The two vertical edges are locked with a gap (35). Together, bridging plates (36) are provided at both ends of the interval (35); the adjusting bolt (71) passes through the interval (35) formed by the two vertical sides, and the adjusting bolt (71) and the positioning nut (73) can rotate and abut against the outer surface of the two bridging plates (36), and the short pins (721) on both sides of the nut seat (72) of the adjusting bolt (71) are respectively inserted into the long groove (341) to constrain the nut seat (72) to rotate; the two vertical sides (34) of the outer bending plate are used to hinge the upper arm (1) and the lower arm (2).

6. A cantilever structure for a support according to claim 5, characterized in that: The short pins (721) on both sides of the nut seat suspend a U-shaped piece (53) on the outside of the vertical edge (34) of the inner bent piece. The bottom of the U-shaped piece (53) is connected to the first end (51) of the spring assembly.

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