Double-spring adjusting arm

Abstract

The utility model relates to a double-spring adjusting arm which comprises a four-connecting-rod cantilever formed by hinging a cantilever upper rod, a cantilever lower rod, a supporting end rod and a hanging end rod through a hinge shaft, and an elastic component for providing lifting force for the four-connecting-rod cantilever. Wherein the elastic component comprises a main spring and an additional spring, and the main spring is arranged on the supporting end rod, acts on the cantilever upper rod or the cantilever lower rod and provides lifting force of the four-connecting-rod cantilever; the additional spring is arranged on two adjacent rod pieces of the four-connecting-rod cantilever and provides additional lifting force. According to the structure, the double-spring design is adopted, the main spring is arranged on the supporting end rod, a large-spring-force spring is convenient to configure, the additional spring is arranged between the cantilever upper rod and the cantilever lower rod, lifting force can be overlaid, force value complementation can be achieved through the spring when the angle of the cantilever changes, the external force needed by adjustment is kept within a narrow variable quantity, and the adjustment effect is good. And the experience feeling of an operator is improved.

Description

Technical Field:

[0001] The utility model belongs to the technical field of adjustable brackets, and particularly relates to a double-spring adjusting arm, which is particularly suitable for supporting the hovering of functional devices such as monitors, realizing the high and low position adjustment and self-positioning of the monitor, and can meet a large load-bearing range. Background Art:

[0002] The monitor bracket with adjustable high and low positions is a common product at present. The key component of this bracket is an arm that can generate support and maintain the state. The arm has a main body composed of four linkages, and an elastic component is also arranged inside the main body, which generates self-positioning ability and provides support force by means of this elastic component. The main components of the spring assembly are two types: gas springs and column springs, and the latter mostly uses tension springs. The spring assembly using column springs also has a pre-tightening force adjustment function. A screw rod is positioned at one end of the spring through a nut seat, and the screw rod is used for adjustment. Therefore, the end of the screw rod can be adjusted.

[0003] At present, there are also deficiencies in such adjusting arms. One is that the load-bearing range is small, with a load-bearing of 2 - 9 kg; the other is that for the load-bearing mechanism of the parallelogram plus spring, during the process of moving from the maximum upper angle to the horizontal and then to the maximum lower dead angle, the change range of the reaction force value for lifting the load is very small, and it cannot realize the lifting force for adapting to the load at different angles at any time. In addition, during the adjustment process of different pitching angles, the change range of the spring force is large, and the experience is poor.

[0004] How to provide a reasonable bracket design has become the object of research of the present utility model. Summary of the Invention:

[0005] The purpose of the present utility model is to design a double-spring adjusting arm with elastic components arranged in both the cantilever and the support end rod.

[0006] The technical solution of the present utility model is realized as follows: A double-spring adjusting arm includes a four-link cantilever formed by hinging a cantilever upper rod, a cantilever lower rod, a support end rod, and a suspension end rod through hinge shafts, and an elastic component that provides the lifting force for the four-link cantilever; it is characterized in that: the elastic component includes a main spring and an additional spring. The main spring is arranged on the support end rod and acts on the cantilever upper rod or the cantilever lower rod to provide the lifting force for the four-link cantilever; the additional spring is arranged on two adjacent rods of the four-link cantilever to provide an additional lifting force.

[0007] A spring cavity is arranged on the support end rod, and the main spring is installed in this spring cavity, with one end acting on the spring cavity and the other end acting on the torsion shaft of the cantilever upper rod or the cantilever lower rod.

[0008] The main spring is a spring with adjustable spring force, and the adjustable spring has any of the following structures: 1. It includes a spring, a nut seat, and a bolt. The nut seat is fixed at one end of the spring, and the bolt is screwed on the nut seat. The pre-tightening force of the spring is adjusted by the bolt; during assembly, the end of the spring directly abuts against the top of the support end rod, the bolt passes through the spring and is screwed with the nut seat at the lower end of the spring; a cross pin is arranged on the nut seat, and the cross pin slides in the axial long groove of the support end rod; 2. It includes a spring, adjusting caps arranged at both ends of the spring, and end caps. Traction pieces and cross pins are arranged on both sides of the end caps; during assembly, the adjusting cap is screwed on the top of the support end rod through thread fit, the cross pins on both sides of the end cap slide in the axial long groove on the support end rod, and the upper end of the traction piece is hinged on the torsion shaft of the upper cantilever rod or the lower cantilever rod.

[0009] The additional spring is a tension spring, with one end acting on the upper cantilever rod and the other end acting on the suspension end rod. The suspension point of the suspension end rod is outside the connection line of the two hinge shafts, and when the four-link cantilever design swings downward to the limit position, the two suspension points and a hinge shaft are in a straight line.

[0010] The additional spring is a tension spring, with one end acting on the lower cantilever rod and the other end acting on the suspension end rod. The suspension point of the suspension end rod is outside the connection line of the two hinge shafts, and when the four-link cantilever design swings downward to the limit position, the two suspension points and a hinge shaft are in a straight line.

[0011] The additional spring is two or more tension springs, or a combined spring, and they are in a series or parallel relationship. The parallel arrangement means that two or more tension springs or combined springs are arranged side by side; the series arrangement means that more than one transition piece is hinged between the upper cantilever rod and the lower cantilever rod. Hinge shafts and suspension points in the same position as the suspension end rod are arranged on the transition piece, and each transition piece provides a suspension for a tension spring or a combined spring.

[0012] The utility model has the characteristics of ingenious concept, reasonable design, and light structure; in particular, the main spring is arranged on the support end rod, which can not only be equipped with a spring with a large spring force to improve the load-bearing capacity range, but also reduce the space occupied by the upper cantilever rod and the lower cantilever rod, and can reduce the volume; and an additional spring is arranged between the upper cantilever rod and the lower cantilever rod, which can not only superimpose the lifting force, but also utilize the force value complementarity of the spring when the cantilever angle changes, so that the external force required for adjustment is maintained within a narrow change range, improving the operator's experience; the combination of the main spring and the additional spring has various forms and can adapt to different space requirements. Description of the Drawings:

[0013] The following further describes the present utility model with specific illustrations:

[0014] Figure 1 It is a schematic diagram of a double-spring adjusting arm

[0015] Figure 2Schematic cross-section of the double-spring adjusting arm

[0016] Figure 3 Schematic elevation angle of the double-spring adjusting arm

[0017] Figure 4 Schematic depression angle of the double-spring adjusting arm

[0018] Figure 5 Schematic of the double-spring adjusting arm II

[0019] Figure 6 Schematic cross-section of the double-spring adjusting arm II at flat angle

[0020] Figure 7 Schematic cross-section of the double-spring adjusting arm II at depression angle

[0021] Figure 8 Schematic of the double-spring adjusting arm III

[0022] Figure 9 Schematic cross-section of the support end rod of the double-spring adjusting arm III

[0023] Figure 10 Schematic cross-section of the double-spring adjusting arm III at elevation angle

[0024] Figure 11 Schematic exploded view of the double-spring adjusting arm IV

[0025] Figure 12 Schematic exploded view of the additional springs in parallel of the double-spring adjusting arm

[0026] Figure 13 Schematic exploded view of the additional springs in series of the double-spring adjusting arm

[0027] Figure 14 Schematic cross-section of the additional springs in series of the double-spring adjusting arm

[0028] Wherein

[0029] 1 - Upper rod of the cantilever; 11 - Torsion shaft; 12 - Transition piece;

[0030] 2 - Lower rod of the cantilever;

[0031] 3 - Support end rod; 31 - Spring cavity; 32 - Axial long slot; 33 - Fixed pin;

[0032] 4 - Suspension end rod; 41 - Suspension point;

[0033] 5 - Hinge shaft;

[0034] 6 - Main spring; 61 - Spring; 62 - Nut seat; 621 - Transverse pin; 63 - Bolt; 64 - Plain bearing;

[0035] 65 - Adjusting cap; 66 - End cap; 661 - Traction piece;

[0036] 7 - Additional spring; Detailed implementation manner:

[0037] Embodiment 1:

[0038] Refer to Figures 1 to 4 , the basic example of the double - spring adjusting arm, includes the cantilever upper rod 1, the cantilever lower rod 2, the support end rod 3, the suspension end rod 4 and the elastic members; the cantilever upper rod 1, the cantilever lower rod 2, the support end rod 3 and the suspension end rod 4 are hinged into a four - link structure by four hinge shafts 5, and the lifting force is provided by the elastic members. The support end rod 3 is used to be positioned on a fixed object, and the suspension end rod 4 is used to suspend functional devices such as a display, so as to achieve the use function of adjustable suspension height.

[0039] The elastic members include a main spring 6 and an additional spring 7. The main spring 6 is arranged on the support end rod 3 and acts on the cantilever upper rod 1 or the cantilever lower rod 2 to provide the lifting force of the four - link cantilever; the additional spring 7 is arranged on two adjacent rods of the four - link cantilever to provide an additional lifting force.

[0040] The support end rod 3 is provided with a spring cavity 31. The main spring 6 is installed in the spring cavity 31, with one end acting on the spring cavity 31 and the other end acting on the torsion shaft 11 of the cantilever upper rod 1 or the cantilever lower rod 2, thereby generating a moment, so that the suspension end rod 4 can suspend and bear weight and be positioned at the required angle. That is to say, at this time, the torsion shaft 11 is outside the hinge shaft 5; further, the force of the additional spring 7 acting on the cantilever lower rod 2 and the support end rod 3 can also achieve the same effect.

[0041] Further, the main spring 6 is a spring with adjustable spring force. The adjustable spring includes: a spring 61, a nut seat 62 and a bolt 63. The nut seat 62 is fixed at one end of the spring 61, and the bolt 63 is screwed on the nut seat 62. The pre - tightening force of the spring is adjusted by the bolt 63 to be compatible with a wider range of weights. In this example, the bolt 63 passes through the torsion shaft 11, and a plain bearing 64 is arranged between the two to reduce the adjustment resistance. Moreover, in this figure, the end of the spring 61 directly abuts against the top of the support end rod 3, the bolt 63 passes through the spring and is screwed with the nut seat 62 arranged at the lower end of the spring, which also causes the nut seat 62 to move following the adjustment. Therefore, a cross pin 621 is arranged on the nut seat, and the cross pin 621 slides in the axial long groove 32 of the support end rod to achieve the guiding effect when adjusting the spring force. In this structure, the spring 61 is selected as a compression spring.

[0042] Of course, the structure where the end of the spring 61 is fixed at the lower part of the support end rod 3 and the nut seat 62 faces upward is not excluded either. This structure is suitable for a tension - spring - type spring 61.

[0043] The additional spring 7 is preferably a tension spring. One end acts on the upper rod 1 of the cantilever, and the other end acts on the suspension end rod 4. The suspension point 41 of the suspension end rod is outside the connection line of the two hinge shafts 5. When the four-link cantilever design swings downward to the limit position, the two suspension points 41 and a hinge shaft 5 are on the same straight line.

[0044] Alternatively, one end of the tension spring of the additional spring 7 acts on the lower rod 2 of the cantilever, and the other end acts on the suspension end rod 4. The suspension point 41 of the suspension end rod is outside the connection line of the two hinge shafts. When the four-link cantilever design swings downward to the limit position, the two suspension points and a hinge shaft are on the same straight line.

[0045] Of course, the use of a compression spring is not excluded, but the structure is just complex. In addition, one end of the additional spring 7 can also be suspended on the support end rod 3, depending on the spatial position.

[0046] Taking the most common case where the support end rod 3 faces downward as an example, since the support end rod 3 is provided with a spring cavity 31 and has a certain length, it can be directly used as a column. That is, the four-link cantilever itself forms a structure with a column. With fixtures, etc., it can stand on fixed objects such as a table, meeting the usage requirements of a certain height.

[0047] On this basis, this structure can also be appropriately deformed according to different requirements to meet the usage requirements of different occasions.

[0048] Embodiment 2:

[0049] Referring to Figure 5 、 Figure 6 and Figure 7 In this example, the support end rod 3 is designed in the reverse direction, that is, it can be suspended upward on a top fixture, such as a ceiling. At this time, the torsion shaft 11 is inside the hinge shaft 5 to play a lifting role. Therefore, the spring 61 is preferably a tension spring. A nut seat 62 is provided at the upper end of the spring 61. The bolt 63 passes through the fixed pin 33 provided at the upper part of the support end rod 3. Similarly, a plain bearing 64 is provided between the two.

[0050] Embodiment 3:

[0051] Referring to Figures 8 to 11 This is the second adjustment structure of the main spring 6 in the first example. The main spring 6 includes: a spring 61, adjustment caps 65 and end caps 66 provided at both ends of the spring. Traction pieces 661 and cross pins 621 are provided on both sides of the end cap 66. For assembly, the adjustment cap 65 is screwed onto the top of the support end rod 3 through thread fitting. The cross pins 621 on both sides of the end cap 66 pass through the axial long groove 32 on the support end rod. The upper end of the traction piece 661 is hinged to the torsion shaft 11 of the upper rod or the lower rod of the cantilever. By changing the spring force of the spring 61 through the adjustment cap 65 and acting on the torsion shaft 11 from the traction piece 661. The adjustment of the spring force of this structure can also be completed by hand.

[0052] In summary, the main spring 6 can be either a compression spring or a tension spring. The support end rod 3 can be designed to face downward or upward, or even non-vertically. It only depends on whether the acting point of the torsion shaft 11 is inside or outside the hinge shaft 5. Simply invert the figures in the above specific examples and adjust the position of the torsion shaft 11 to obtain any of the above changes and combinations, which belong to equivalent solutions without creative labor. The above additional spring 7 is designed with only one spring, but two or more springs can also be used. According to the spatial relationship of the four-link cantilever, there are also two equivalent changes, which are specifically as follows:

[0053] I. Refer to Figure 12 , two or more tension springs are designed in parallel. Parallel connection means that two or more tension springs are arranged side by side, effectively increasing the spring force of the additional spring 7. The tension springs mentioned here also include combined springs.

[0054] II. Refer to Figure 13 and Figure 14 , two or more tension springs are connected in series. Series connection means that there is one or more transition pieces 12 hinged between the upper cantilever rod 1 and the lower cantilever rod 2. The transition piece 12 is provided with a hinge shaft 5 and a suspension point 41 at the same position as the suspension end rod 4, and each transition piece provides a suspension for a tension spring or a combined spring. Series connection can use short tension springs and requires less space.

[0055] III. Any combination method obtained by combining and transforming the above designs belongs to equivalent solutions and can achieve the same effect.

[0056] The following gives the theoretical calculation charts of the bearing capacity values of the four-link cantilever elastic components. From the analysis of the curves of the three charts, the double-spring structure is significantly better than the single-spring structure. The bearing capacity value of the main spring changes with the angle, showing a basically linear relationship. From high to low in the pitch angle, the bearing capacity value increases linearly, as shown in Table 1. The bearing capacity value of the additional spring is a smooth curve. From high to low in the pitch angle, the bearing capacity value decreases linearly, as shown in Table 2. From the above two charts, although both can meet the load-bearing requirements, the external force required for pitch adjustment is exactly opposite to the bearing capacity value. That is to say, the adjustment experience of the four-link cantilever with two single-spring structures is relatively poor. Chart 3 is the bearing capacity value curve of the double-spring structure. Because the bearing capacities of the two springs complement each other, the bearing capacity value within the designed pitch angle change range remains basically constant, and the force required for the user to adjust is also relatively constant. On the basis of obtaining good load-bearing performance, the use experience is greatly improved. Table 1: Theoretical calculation chart of the bearing capacity value of the main spring

[0057]

[0058] Table 2: Theoretical calculation chart of the bearing capacity value of the additional spring

[0059]

[0060] Table 3: Theoretical Calculation Diagram of Double Spring Bearing Capacity Value

[0061] 。

Claims

1. A double-spring adjusting arm, comprising a four-link cantilever formed by hinging a cantilever upper rod (1), a cantilever lower rod (2), a support end rod (3) and a suspension end rod (4) through a hinge shaft (5), and an elastic member for providing a lifting force to the four-link cantilever; characterized in that: The elastic member includes a main spring (6) and an additional spring (7). The main spring (6) is arranged on the support end rod (3) and acts on the cantilever upper rod (1) or the cantilever lower rod (2) to provide the lifting force of the four-link cantilever. The additional spring (7) is arranged on two adjacent rods of the four-link cantilever to provide an additional lifting force.

2. The double spring adjusting arm according to claim 1, characterized in that: A spring cavity (31) is arranged on the support end rod (3). The main spring (6) is installed in the spring cavity (31), with one end acting on the spring cavity (31) and the other end acting on the torsion shaft (11) of the cantilever upper rod or the cantilever lower rod.

3. A double spring adjusting arm according to claim 1 or 2, characterized in that: The main spring (6) is a spring with adjustable spring force. The adjustable spring has any of the following structures: One, it includes a spring (61), a nut seat (62) and a bolt (63). The nut seat (62) is fixed at one end of the spring (61), and the bolt (63) is screwed on the nut seat (62). The pre-tightening force of the spring is adjusted by the bolt (63). During assembly, the end of the spring (61) directly abuts against the top of the support end rod (3), and the bolt (63) passes through the spring and is screwed with the nut seat (62) at the lower end of the spring. A cross pin (621) is arranged on the nut seat (62), and the cross pin (621) slides in the axial long groove (32) of the support end rod (3). Two, it includes a spring (61), adjusting caps (65) arranged at both ends of the spring, and end caps (66). Traction pieces (661) and cross pins (621) are arranged on both sides of the end cap (66). During assembly, the adjusting cap (65) is screwed on the top of the support end rod (3) through thread fit, and the cross pins (621) on both sides of the end cap (66) slide in the axial long groove (32) on the support end rod. The upper end of the traction piece (661) is hinged on the torsion shaft (11) of the cantilever upper rod or the cantilever lower rod.

4. A double spring adjusting arm according to claim 1, characterized in that: The additional spring (7) is a tension spring. One end acts on the cantilever upper rod (1), and the other end acts on the suspension end rod (4). The suspension point (41) of the suspension end rod is outside the connection line of the two hinge shafts (5). And when the four-link cantilever swings downward to the limit position in the design, the two suspension points (41) and a hinge shaft (5) are on the same straight line.

5. A double spring adjusting arm according to claim 1, characterized in that: The additional spring (7) is a tension spring. One end acts on the cantilever lower rod (2), and the other end acts on the suspension end rod (4). The suspension point (41) of the suspension end rod (4) is outside the connection line of the two hinge shafts (5). And when the four-link cantilever swings downward to the limit position in the design, the two suspension points (41) and a hinge shaft (5) are on the same straight line.

6. A double spring adjusting arm according to claim 4 or 5, characterized in that: The additional spring (7) is two or more tension springs, or a combined spring, and they are in a series or parallel relationship. The parallel arrangement means that two or more tension springs or combined springs are arranged side by side. The series arrangement means that more than one transition piece (12) is hinged between the cantilever upper rod (1) and the cantilever lower rod (2). Hinge shafts (5) and suspension points (41) in the same position as those of the suspension end rod (4) are arranged on the transition piece (12). Each transition piece provides a suspension for a tension spring or a combined spring.

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