Support adjusting arm

Abstract

The utility model relates to a support adjusting arm which comprises an upper cantilever, a lower cantilever, a supporting seat, a hanging seat and a pre-tightening spring. The two ends of the upper cantilever and the two ends of the lower cantilever are hinged to the supporting base and the hanging base through hinged shafts respectively to form a parallel four-connecting-rod mechanism, and pre-tightening force is provided by a pre-tightening spring. Wherein one end of the pre-tightening spring is hung on the upper cantilever or the lower cantilever, and the other end of the pre-tightening spring is hinged to a swing rod through a driving shaft and then hinged to the supporting seat or the hanging seat through the swing rod; an adjusting bolt is rotatably positioned on the supporting seat or the hanging seat hinged to the swing rod, the adjusting bolt is in threaded fit with the driving shaft, the included angle between the pre-tightening spring and the swing rod can be driven to be changed, and then the spring force of the pre-tightening spring is changed. The utility model has the characteristics of unique conception, reasonable structure, tightness indication and convenience in operation; during adjustment, the pointer at the end of the swing rod swings synchronously, indication corresponding to tightness is provided at the observation window, and the adjustment has a more accurate target.

Description

Technical Field

[0001] This utility model belongs to the field of cantilever bracket technology, and particularly relates to a bracket adjustment arm, especially an adjustment arm with a preload indicator. Background Technology

[0002] Existing cantilever brackets are mainly used for supporting and adjusting display equipment, satisfying height, distance, and tilt adjustments. The key component of the bracket, the adjusting bracket, mostly employs a four-bar linkage and a preload spring combination. The preload spring maintains self-positioning during suspension; however, the preload spring has a limited load-bearing range. When replacing equipment of different specifications, the preload spring needs to be adjusted to a suitable range. Because the preload spring is close to the adjusting arm in direction, and the adjusting bolt's feed direction is consistent with the preload spring's axis, it is difficult to design a position indicator structure.

[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 bracket adjustment arm that changes the adjustment direction of the preload spring, and the secondary purpose is to provide a scheme for adjusting the preload spring with an indicator.

[0005] The technical solution of this utility model is implemented as follows: A bracket adjustment arm includes an upper cantilever, a lower cantilever, a support seat, a suspension seat, and a preload spring; the two ends of the upper and lower cantilever are respectively hinged to the support seat and the suspension seat via hinge shafts, forming a parallel four-bar linkage, and the preload spring provides the preload force; the characteristic is that: one end of the preload spring is suspended on the upper or lower cantilever, and the other end is hinged to a swing rod via a drive shaft, and the swing rod is then hinged to the support seat or the suspension seat; an adjustment bolt is rotatably positioned on the support seat or the suspension seat to which the swing rod is hinged, and the adjustment bolt is threadedly engaged with the drive shaft, which can drive and change the angle between the preload spring and the swing rod.

[0006] The swing arm has a shaft hole and a long slot hole at both ends, and an access hole perpendicular to the long slot hole is opened at the end of the long slot hole. A pointer is set outward from the end with the shaft hole. An observation window is set on the support or suspension seat to which the swing arm is hinged, corresponding to the swing stroke trajectory of the pointer. One end of the preload spring is connected to a sheet metal lug, and one end of the sheet metal lug is provided with a hanging hole. The hanging hole overlaps with the long slot hole on the swing arm and is passed through by the drive shaft to form a rotatable positioning. A threaded hole is machined in the middle of the drive shaft, and an adjusting bolt passes through the access hole of the swing arm and is screwed onto the threaded hole.

[0007] One end of the preload spring is suspended on the upper cantilever, and the other end of the swing rod is hinged to the support base through the swing rod hinge. The support base has a notch corresponding to the travel trajectory of the drive shaft, and at least in the direction of pointer swing, it is an arc angle. An observation window is provided in this arc angle.

[0008] The upper cantilever is a hollow molded part with an inner cavity, and staggered ribs are formed on both sides. A hook for suspending the preload spring is formed on the inner side of the rib at one end of the suspension seat. The lower cantilever and the preload spring are both installed in the inner cavity of the upper cantilever.

[0009] The support base has a hole for the adjusting bolt to pass through, and a clamping piece is locked inside the hole. The clamping piece can be movably clamped on the adjusting bolt's annular groove.

[0010] A shielding plate is positioned on the side of the support base facing the upper cantilever, and the suspended end of the shielding plate is inserted into the reserved groove of the upper cantilever.

[0011] The support base is positioned above the hinge pins of the upper and lower cantilever arms.

[0012] This utility model features a unique design, reasonable structure, tightness indicator, and convenient operation. The adjusting bolt of the pre-tightening spring adopts a split structure, and the spring force is changed by adjusting the angle of the pre-tightening spring and the swing rod. During adjustment, the pointer at the end of the swing rod swings synchronously, providing a corresponding tightness indicator in the observation window, making the adjustment more accurate. Attached Figure Description

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

[0014] Figure 1 Schematic diagram of the bracket adjustment arm

[0015] Figure 2 Exploded view of the bracket adjusting arm

[0016] Figure 3 Schematic diagram of the relationship between the support base and the preload spring

[0017] Figure 4 is a schematic diagram of the swing arm.

[0018] Figure 5 is a schematic diagram of the drive shaft.

[0019] in

[0020] 1—Upper cantilever; 11—Inner cavity; 12—Firming plate; 13—Hook; 14—Pre-reserved groove;

[0021] 2—Lower cantilever;

[0022] 3—Support base; 31—Observation window; 32—Notch; 33—Clamping piece; 34—Shielding piece; 35—Hole;

[0023] 4—Suspension seat;

[0024] 5—Preload spring; 51—Swing rod; 511—Shaft hole; 512—Long slot hole; 513—Connection hole; 514—Pointer;

[0025] 52—Drive shaft; 521—Threaded hole; 53—Adjusting bolt; 54—Sheet metal lug; 541—Hanging hole;

[0026] 6—Hinge; 61—Swing arm pivot; Detailed Implementation

[0027] Reference Figure 1 As shown in Figure 5, the bracket adjusting arm includes an upper cantilever 1, a lower cantilever 2, a support base 3, a suspension base 4, and a preload spring 5. The upper cantilever 1 and lower cantilever 2 are hinged at both ends to the support base 3 and suspension base 4 via hinge pins 6, forming a parallel four-bar linkage mechanism. The preload spring 5 provides the preload force, which is the most basic structure of existing four-bar linkage adjusting arms. One end of the preload spring 5 can be suspended on either the upper cantilever 1 or the lower cantilever 2, and the other end is hinged to a swing rod 51 via a drive shaft 52. The swing rod 51 is then hinged to the support base 3 or suspension base 4. An adjusting bolt 53 can be rotatably positioned on the support base 3 or suspension base 4 to which the swing rod 51 is hinged. This adjusting bolt 53 is threadedly engaged with the drive shaft 52, driving the change of the angle between the preload spring 5 and the swing rod 51, thereby changing the length and tension of the preload spring 5, reflecting the change in the spring preload force.

[0028] As shown in Figure 4, the swing rod 51 has a shaft hole 511 and a long slot hole 512 at both ends, and an access hole 513 perpendicular to the long slot hole 512 is provided at the end of the long slot hole 512. A pointer 514 is provided outward at the end of the shaft hole 511. An observation window 31 is provided on the support 3 or suspension 4 to which the swing rod 51 is hinged, corresponding to the swing stroke trajectory of the pointer 514. One end of the preload spring 5 is connected to a sheet metal hanging ear 54. One end of the sheet metal hanging ear 54 is provided with a hanging hole 541. The hanging hole 541 overlaps with the long slot hole 512 on the swing rod and is passed through by the drive shaft 52 to form a rotatable positioning. A threaded hole 521 is machined in the middle of the drive shaft 52. An adjusting bolt 53 passes through the access hole 513 of the swing rod and is screwed into the threaded hole 521, as shown in Figure 5.

[0029] As a preferred embodiment, one end of the preload spring 5 is suspended on the upper cantilever 1, and one end of the swing rod 51 is hinged to the support base 3 through the swing rod hinge 61. The support base 3 has a notch 32 corresponding to the travel trajectory of the drive shaft 52, so as to give the drive shaft 52 room to move. The support base 3 has an arc angle at least in the swing direction of the pointer 514, and an observation window 31 is provided in the arc angle.

[0030] In this example, the support base 3 is positioned above the hinge pin 61 of the upper cantilever 1 and the lower cantilever 2. Using a preload spring of the same specification can achieve a greater load-bearing capacity.

[0031] The upper cantilever 1 is a hollow molded part with an inner cavity 11, such as a cast part or a plastic molded part. It has staggered ribs 12 formed on both sides, and a hook 13 for suspending the preload spring is formed on the inner side of the rib 12 at one end of the suspension seat 4. The lower cantilever 2 and the preload spring 5 are both installed in the inner cavity 11 of the upper cantilever. The hollow upper cantilever 1 forms a fully enclosed structure. The complete adjustable arm can be formed by simply fastening a decorative plate on the rib 12.

[0032] The rotatable positioning of the adjusting bolt 5 refers to the fact that the support base 3 has a hole 35 for the adjusting bolt 53 to pass through, and a clamping piece 33 is locked inside the hole. The clamping piece 33 can be movably clamped on the annular groove of the adjusting bolt 53. Figure 2 and Figure 3 .

[0033] In addition, when adjusting the tilt angle of the adjusting arm, there will be a large opening between the upper cantilever 1 and the support base 3, especially in the structure where the two hinge shafts 6 are designed to be lower. To address this, a baffle plate 34 is positioned on the support base 3 facing the upper cantilever side. The suspended end of the baffle plate 34 is inserted into the reserved groove 14 of the upper cantilever. The baffle plate 34 is an elastic plate that allows for appropriate deformation to accommodate the swing of the upper cantilever 1. The reserved groove 14 in the upper cantilever 1 is used to restrict the suspended end, so that it fits against the inner side of the upper cantilever.

[0034] The above embodiments and illustrations are shown from the most common angle. Depending on the product usage, adjustments can be made based on this principle, such as swapping the functions of the support base 3 and the suspension base 4, or fixing the support base 3 upwards. These are all conventional design modifications and do not exceed the protection scope of this application.

Claims

1. A bracket adjusting arm, comprising an upper cantilever (1), a lower cantilever (2), a support seat (3), a suspension seat (4), and a preload spring (5); the upper cantilever (1) and the lower cantilever (2) are respectively hinged to the support seat (3) and the suspension seat (4) via hinge pins (6), forming a parallel four-bar linkage, and the preload spring (5) provides the preload force; characterized in that: One end of the preload spring (5) is suspended on the upper cantilever (1) or the lower cantilever (2), and the other end is hinged to a swing rod (51) via a drive shaft (52). The swing rod (51) is then hinged to a support seat (3) or a suspension seat (4). An adjusting bolt (53) can be rotatably positioned on the support seat (3) or the suspension seat (4) to which the swing rod (51) is hinged. The adjusting bolt (53) is threadedly engaged with the drive shaft (52) and can drive the change of the angle between the preload spring (5) and the swing rod (51).

2. The bracket adjustment arm according to claim 1, characterized in that: The swing rod (51) has a shaft hole (511) and a long slot hole (512) at both ends, and an access hole (513) perpendicular to the long slot hole (512) is provided at the end of the long slot hole (512). A pointer (514) is provided outward at the end of the shaft hole (511). An observation window (31) is provided on the support seat (3) or suspension seat (4) hinged to the swing rod (51) to correspond to the swing stroke trajectory of the pointer (514). One end of the preload spring (5) is connected to a sheet metal hanging ear (54). One end of the sheet metal hanging ear (54) is provided with a hanging hole (541). The hanging hole (541) overlaps with the long slot hole (512) on the swing rod and is passed through by the drive shaft (52) to form a rotatable positioning. A threaded hole (521) is machined in the middle of the drive shaft (52). An adjusting bolt (53) passes through the access hole (513) of the swing rod and is screwed onto the threaded hole (521).

3. A bracket adjustment arm according to claim 1 or 2, characterized in that: One end of the preload spring (5) is suspended on the upper cantilever (1), and one end of the swing rod (51) is hinged to the support seat (3) through the swing rod hinge (61). The support seat (3) has a notch (32) corresponding to the travel trajectory of the drive shaft (52). At least the swing direction of the pointer (514) is an arc angle, and an observation window (31) is provided on the arc angle.

4. The bracket adjustment arm according to claim 3, characterized in that: The upper cantilever (1) is a hollow molded part with an inner cavity (11), and staggered ribs (12) are formed on both sides. A hook (13) for suspending the preload spring is formed inside the rib (12) at one end of the suspension seat (4). The lower cantilever (2) and the preload spring (5) are both installed in the inner cavity (11) of the upper cantilever.

5. A bracket adjustment arm according to claim 3, characterized in that: The support base (3) has a hole through which the adjusting bolt (53) passes. A clamping piece (33) is locked inside the hole. The clamping piece (33) can be movably clamped on the annular groove of the adjusting bolt (53).

6. The bracket adjustment arm according to claim 3, characterized in that: A shield (34) is positioned on the side of the support base (3) facing the upper cantilever, and the suspended end of the shield (34) is inserted into the reserved groove (14) of the upper cantilever.

7. A bracket adjustment arm according to claim 4, characterized in that: The support base (3) is positioned above the hinge pins (61) of the upper and lower cantilever arms (1) and the lower cantilever arm (2).

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