Support cantilever structure

Abstract

The utility model relates to a support cantilever structure. A cantilever 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 field:

[0001] The utility model belongs to the technical field of adjustable brackets, and particularly relates to a bracket cantilever structure, and is particularly capable of realizing a solution for adjusting a large pitch angle. Background technology:

[0002] Adjustable monitor stands have long been widely used in industrial and civilian fields, providing people with more user-friendly operation and viewing angles. Most of their structures use a parallel four-bar linkage mechanism and use spring force to maintain the hovering angle. When the spring force is designed, it is adjusted based on the spring force of the torque required for the horizontal hovering position. When the cantilever is adjusted to the pitch limit position, the spring is stretched or compressed due to the change in the distance between the fulcrums at both ends of the spring, causing the spring force to increase or decrease sharply. It often droops when adjusted to the highest point, and rebounds when adjusted to the lowest point. The adjustable range is limited, limiting the use scenarios. For this reason, the industry has made the following improvements:

[0003] For example, patent application number CN2014108381463 discloses a display stand spring arm, including an arm body and a spring assembly; wherein the arm body includes an upper cover, a lower cover, an upper shaft seat, a lower shaft seat and a spring assembly, and the upper cover, the lower cover, the upper shaft seat and the lower shaft seat are hinged to form a four-bar linkage; the spring assembly is built between the upper cover and the lower cover, one end of which is in contact with the cam surface of the lower shaft seat by means of a pulley, and the other end is used to adjust the resistance force by means of a bevel gear pair. The spring assembly shortens the travel difference of the spring assembly when the arm is adjusted from the horizontal to the pitch limit position by means of one end in contact with the cam surface, that is, to minimize the length change value of the spring in the spring assembly, but the cam radius difference is still limited, which only plays an improvement role, and it is still difficult to completely overcome the defects in the prior art structure.

[0004] How to provide a solution for the spring assembly to have a relatively constant spring force during the support arm adjustment process becomes the research object of the present utility model. Summary of the invention:

[0005] The utility model aims to design a bracket cantilever structure in which one end of a spring component follows the pitch change of the cantilever through a triangular connecting rod group.

[0006] The technical solution of the utility model is implemented as follows: a bracket cantilever structure, the cantilever body includes 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-link structure, and the upper arm and the lower arm are enclosed to form a spring cavity that can accommodate the spring assembly, and the spring assembly maintains the hovering position of the cantilever body; it is characterized in that: the spring assembly has a first end and a second end, the first end is movably connected with the first seat body, and the second end is movably hinged on a triangular connecting rod group; the triangular connecting rod group includes a swing rod and a traction rod whose ends are hinged together by an angle hinge shaft, the other end of the traction rod is hinged to the upper arm by an upper hinge shaft, and the other end of the swing rod is hinged to the lower arm by a lower hinge shaft; the spring assembly is directly hinged to the angle hinge shaft, or is hinged to the swing rod by a fourth hinge shaft.

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

[0008] The swing lever is a groove-shaped sheet metal part, which is clamped at one end of the spring assembly. The traction rod is two separate metal sheets, which are respectively attached to the two sides of the swing lever and are correspondingly hinged to the two 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 a connection through an adjustment mechanism, which includes an adjustment bolt arranged 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 matched with the adjustment bolt and can be driven to move by the adjustment bolt.

[0010] The first seat body is a sheet metal part, including inner bending pieces and outer bending pieces that are symmetrical in pairs, and the four bending pieces all have folding edges and vertical edges. The folding edges of the inner and outer bending pieces overlap, and there is a gap between the vertical edges; the overlapping folding edges are welded together and formed with mounting holes; the vertical edges of the inner bending pieces are also formed with symmetrical long grooves, and the two vertical edges are locked together with intervals, and bridging pieces are provided at both ends of the intervals; the adjusting bolt passes through the interval formed by the two vertical edges, and the adjusting bolt and the positioning nut can be rotatably abutted against the outer sides of the two bridging pieces respectively, and the short pins on both sides of the nut seat that are threaded with the adjusting bolt are respectively passed through the long grooves to constrain the nut seat to rotate; the two vertical edges of the outer bending piece are used to hinge the upper arm and the lower arm.

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

[0012] The utility model utilizes the angle of a triangular connecting rod group to hinge the second end of the spring assembly, so that when the cantilever is raised or drooped at a large angle, the distance between the first end and the second end of the spring assembly is kept relatively stable, and the spring force is maintained relatively constant, so that the support arm does not droop when adjusted to the highest point, and does not rebound when adjusted to the lowest point, thereby meeting the needs of special scenarios. Description of the drawings:

[0013] The present invention will be further described below in conjunction with specific illustrations:

[0014] Figure 1 Schematic diagram of the cantilever structure of the bracket

[0015] Figure 2 Front view of the cantilever structure of the bracket

[0016] Figure 3 Schematic diagram of the bracket cantilever structure decomposition

[0017] Figure 4 Schematic diagram of the cantilever structure of the bracket from top view

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

[0019] Figure 6 Schematic diagram of the cross-section of the cantilever structure lifting angle

[0020] Figure 7 Schematic diagram of the cross section of the bracket cantilever structure at the lowering angle

[0021] in

[0022] 1—upper arm;

[0023] 2—lower arm;

[0024] 3—first seat body; 31—inner bending piece; 32—outer bending piece; 33—folded foot edge; 331—mounting hole;

[0025] 34—vertical edge; 341—long groove; 35—interval; 36—bridge piece;

[0026] 4—second seat body;

[0027] 5—spring assembly; 51—first end; 52—second end; 53—U-shaped piece;

[0028] 6—triangular connecting rod group; 61—swing rod; 62—traction rod; 63—angle hinge shaft; 64—upper hinge shaft;

[0029] 65—lower hinge axis; 66—fourth hinge axis;

[0030] 7—adjusting mechanism; 71—adjusting bolt; 72—nut seat; 721—short pin; 73—positioning nut; Specific implementation method:

[0031] Reference Figures 1 to 7 , the bracket cantilever structure, the cantilever body includes an upper arm 1, a lower arm 2, a first seat body 3, a second seat body 4 and a spring assembly 5; the upper arm 1, the lower arm 2, the first seat body 3 and the second seat body 4 are hinged to form a four-bar structure, and the upper arm 1 and the lower arm 2 are enclosed 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 with the first seat body 3, and the second end 52 is movably hinged on the triangular connecting rod group 6, and the spring assembly 5 maintains the hovering position of the cantilever body, that is, the self-positioning of the cantilever body.

[0032] The triangular connecting rod group 6 includes a swing rod 61 and a traction rod 62, and the ends of the two are hinged together through an angle hinge 63. The other end of the traction rod 63 is hinged to the upper arm 1 through an upper hinge 64, and the other end of the swing rod 61 is hinged to the lower arm 2 through a lower hinge 65, so that the angle or the angle hinge 63 can change with the pitch adjustment of the cantilever body. The spring assembly 5 is directly hinged to the angle hinge 63, or hinged to the swing rod 61 through a fourth hinge 66. This example is a scheme using the fourth hinge 66. The purpose of using the fourth hinge 66 is to expand the following change range. Specifically, the distance between the lower hinge 65 of the swing rod and the fourth hinge 66 is greater than the distance between the lower hinge 65 and the angle hinge 63, and the fourth hinge 66 is on the inner side of the line connecting the angle hinge 63 and the lower hinge 65. The triangular connecting rod group 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 It is the lowest falling 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 is two separate metal sheets, which are respectively attached to the two sides of the swing rod 61 and are correspondingly hinged on the two sides of the upper arm 1 through the segmented upper hinge shaft 64, leaving a swing space for the spring assembly 5 in the middle.

[0034] The first end 51 of the spring assembly is movably connected to the first seat body 3, which is connected through the adjustment mechanism 7 to adjust the preload force to meet different load-bearing requirements, such as Figure 3 .

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

[0036] Furthermore, the first seat body 3 is a sheet metal part, including inner bending pieces 31 and outer bending pieces 32 that are symmetrical in pairs. The four bending pieces all have folding edges 33 and vertical edges 34. The folding edges 33 of the inner and outer bending pieces overlap, and there is a gap between the vertical edges 34; the overlapping folding edges 33 are welded together and formed with mounting holes 331; the vertical edges 34 of the inner bending pieces are also formed with symmetrical long grooves 341, and 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, and the adjusting bolt 71 and the positioning nut 73 can be rotatably abutted on the outer sides of the two bridging pieces 36, that is, they are abutted on the two bridging pieces 36 through the two end surface bearings; the short pins 721 on both sides of the nut seat 72 threadedly matched with the adjusting bolt 71 are respectively penetrated through the long grooves 341 to constrain the nut seat 72 to rotate.

[0037] The two vertical sides 34 of the outer bending piece 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 hinged on both sides using segmented shafts to avoid the middle space for the adjustment mechanism 7. Of course, casting is not excluded.

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

Claims

1. A support cantilever structure, wherein the cantilever body comprises an upper arm (1), a lower arm (2), a first seat body (3), a second seat body (4) and a spring assembly (5); the upper arm (1), the lower arm (2), the first seat body (3) and the second seat body (4) are hinged to form a four-bar structure, and the upper arm (1) and the lower arm (2) are enclosed to form a spring cavity capable of accommodating the spring assembly (5), and the spring assembly (5) maintains the cantilever body in a suspended position; Features: The spring assembly (5) comprises a first end (51) and a second end (52), wherein the first end (51) is movably connected to the first seat body (3), and the second end (52) is movably hinged to the triangular connecting rod group (6); the triangular connecting rod group (6) comprises a swing rod (61) and a traction rod (62) whose ends are hinged together through an angle hinge shaft (63); the other end of the traction rod (62) is hinged to the upper arm (1) through an upper hinge shaft (64), and the other end of the swing rod (61) is hinged to the lower arm (2) through a lower hinge shaft (65); the spring assembly (5) is directly hinged to the angle hinge shaft (63), or is hinged to the swing rod (61) through a fourth hinge shaft (66).

2. A bracket cantilever structure according to claim 1, Features: The distance between the lower hinge shaft (65) of the swing lever (61) and the fourth hinge shaft (66) is greater than the distance between the lower hinge shaft (65) and the angle hinge shaft (63), and the fourth hinge shaft (66) is located on the inner side of the line connecting the angle hinge shaft (63) and the lower hinge shaft (65).

3. A support cantilever structure according to claim 1 or 2, Features: 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) is two separate metal sheets, which are respectively attached to the two sides of the swing rod (61) and are correspondingly hinged to the two sides of the upper arm (1) through segmented upper hinge shafts (64).

4. The support cantilever structure according to claim 1, Features: The movable connection between the first end (51) of the spring assembly and the first seat body (3) refers to a connection via an adjustment mechanism (7), wherein the adjustment mechanism (7) comprises an adjustment bolt (71) arranged on one side of the first seat body (3) and a nut seat (72) movably connected to the first end (51) of the spring assembly, wherein the nut seat (72) is threadedly matched with the adjustment bolt (71) and can be driven to move by the adjustment bolt (71).

5. A support cantilever structure according to claim 1 or 4, Features: The first seat body (3) is a sheet metal part, comprising inner bending pieces (31) and outer bending pieces (32) that are symmetrical in pairs, the four bending pieces all having folding edges (33) and vertical edges (34), the folding edges (33) of the inner bending pieces (31) and the outer bending pieces (32) overlap, and there is a gap between the vertical edges (34); the overlapping folding edges (33) are welded together and formed with mounting holes (331); the vertical edges (34) of the inner bending pieces are also formed with symmetrical long grooves (341), and the two vertical edges are locked at intervals (35). Together, bridge pieces (36) are arranged at both ends of the interval (35); the adjusting bolt (71) passes through the interval (35) formed by the two vertical edges, the adjusting bolt (71) and the positioning nut (73) are respectively rotatable against the outer sides of the two bridge pieces (36), and the short pins (721) on both sides of the nut seat (72) threadedly matched with the adjusting bolt (71) are respectively arranged in the long groove (341) to restrict the nut seat (72) from rotating; the two vertical edges (34) of the outer bending piece are used to hinge the upper arm (1) and the lower arm (2).

6. A support cantilever structure according to claim 5, Features: A U-shaped piece (53) is suspended on the outside of the vertical edge (34) of the inner bending piece by the short pins (721) on both sides of the nut seat, and the bottom of the U-shaped piece (53) is connected to the first end (51) of the spring assembly.

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