Adjustable support arm and display bracket

Abstract

The present invention relates to an adjustable support arm, comprising an upper arm, a lower arm, a first seat body, a second seat body and a spring assembly, and the upper arm, the lower arm, the second seat body and the second seat body are hinged to form a four-bar structure; the spring assembly has a first end and a second end, and the first end forms a movable connection with the upper arm or the lower arm; wherein: it also includes a lever, the lever shaft is positioned on the lower arm or the upper arm, one end is hinged with the second end of the spring assembly, and the other end is processed with a gear surface; a fixed gear is locked on the second seat body, and the gear surface of the fixed gear is meshed with the gear surface on the lever; the spring force of the spring assembly is transmitted to the second seat body by means of the lever and the fixed gear. The spring assembly of the present invention uses the lever transition to avoid directly acting on the second seat body, which not only changes the direction of the force, but also can meet the force requirements of different workstations through the design of the length of the force arm, thereby improving the shortcomings of the prior art of high-position drooping or low-position rebound.

Description

Technical field:

[0001] The invention belongs to the field of adjustable bracket equipment, and in particular relates to an adjustable support arm and a display bracket. In particular, when the support arm is adjusted to a high or low limit position, a built-in spring component has a nearly constant acting force. 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 hovering horizontal position. When the cantilever is adjusted to the pitch limit position, the spring force increases sharply due to the stretching of the spring, and often it will sag when adjusted to the highest point, and rebound when adjusted to the lowest point. 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 invention. Summary of the invention:

[0005] The purpose of the present invention is to invent an adjustable support arm and a display bracket in which one end of a spring assembly is transitioned through a lever to reduce the travel difference.

[0006] The technical solution of the present invention is implemented as follows: an adjustable support arm 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 second seat body and the second seat body are hinged to form a four-bar structure, and the upper arm and the lower arm are enclosed to form a spring cavity that can accommodate the spring assembly; the spring assembly has a first end and a second end, and the first end is movably connected to the upper arm or the lower arm; it is characterized in that: it also includes a lever, the lever shaft is positioned on the lower arm or the upper arm, one end is hinged to the second end of the spring assembly, and the other end is processed with a gear surface; a fixed gear is locked on the second seat body, and the gear surface of the fixed gear is meshed with the gear surface on the lever; the spring force of the spring assembly is transmitted to the second seat body by means of the lever and the fixed gear.

[0007] The spring assembly includes a spring, a nut seat and a screw rod; the nut seat is fixed to the end of the spring, the threaded section of the screw rod is screwed on the nut seat, and the screw rod head and the end of the spring constitute the first end and the second end of the spring assembly.

[0008] One end of the spring is directly bent into a hanging ring, and is hung on one end of the lever with the help of the hanging ring; the screw head is movably connected to the upper arm or lower arm through one of the following structures: 1. The screw head passes through a through hole reserved in the upper arm or lower arm, and the contact surface between the screw head and the through hole is correspondingly formed into an arc surface, allowing the screw to swing relative to the through hole; 2. The screw passes through a hole opened in the middle of the hinge shaft, and is positioned on the upper arm or lower arm by the hinge shaft, allowing the screw to swing up and down around the axis; an end face bearing is arranged between the screw head and the hinge shaft.

[0009] A monitor stand comprises a base, a fixed arm and a connecting plate for hanging the monitor, and the adjustable support arm mentioned above; the lower end of the fixed arm is rotatably positioned on the base, and the upper end is rotatably positioned on the adjustable support arm, and the upper end of the adjustable support arm is positioned on the connecting plate through a cross axis; it is characterized in that: the base also has a desktop clamp, which comprises an L-shaped support plate, an L-shaped clamp and a bolt clamp; the L-shaped support plate and the L-shaped clamp are formed by bending steel plates at right angles, and have a vertical surface and a horizontal surface; the L-shaped support plate is inverted and locked on the bottom surface of the base, and the vertical surface of the L-shaped clamp is affixed and locked together with the vertical surface of the L-shaped support plate, and a clamp is formed by the horizontal surfaces of the two; the bolt clamp has a bolt handle and a bowl-shaped clamp fixed to the end of the bolt handle, which is rotated and positioned on the horizontal plane of the L-shaped clamp with the help of the bolt handle, forming a structure with an adjustable distance between the bowl-shaped clamp and the base.

[0010] The vertical surface of the L-shaped support plate is provided with more than two rows of threaded holes, and the vertical surface of the L-shaped clamping plate is provided with a corresponding row of through holes. The fastening screws pass through the through holes and are screwed on the threaded holes to form a locking structure.

[0011] The through hole on the L-shaped clamping plate is a gourd-shaped hole that is larger at the bottom and smaller at the top, and the diameter of the large end of the gourd-shaped hole is larger than the head of the fastening screw.

[0012] The spring assembly of the present invention avoids directly acting on the second seat body by means of a lever transition, which not only changes the direction of the force, but also meets the force requirements of different workstations by designing the length of the force arm, thereby improving the shortcomings of the prior art such as high-position drooping or low-position rebound. Description of the drawings:

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

[0014] Figure 1 Schematic diagram of adjustable support arm

[0015] Figure 2 Schematic diagram of the adjustable support arm

[0016] Figure 3 Schematic diagram of the monitor stand

[0017] Figure 4 Schematic diagram of the display stand cross section

[0018] Figure 5 Schematic diagram of the base

[0019] Figure 6 Schematic diagram of spring assembly decomposition

[0020] in

[0021] 100—Adjustable support arm 1—Upper arm 11—Through hole 2—Lower arm

[0022] 21—cable management groove 211—slot nail 3—first seat body 4—second seat body

[0023] 5—spring assembly 51—first end 52—second end 53—spring

[0024] 54—nut seat 55—screw 551—screw head 56—hinge shaft

[0025] 57—end bearing 6—lever 61—gear surface 62—fixed gear

[0026] 7—base 71—L-shaped support plate 711—threaded hole 72—L-shaped clamp

[0027] 721 - through hole 73 - bolt chuck 731 - bolt handle 732 - bowl-shaped chuck

[0028] 74—fastening screw 8—fixed arm 9—connecting plate Specific implementation method:

[0029] Reference Figure 1 , Figure 2 , Figure 4 and Figure 6 , the adjustable support arm 100 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 second seat body 3 and the second seat body 4 are hinged to form a four-bar structure, more precisely a parallel four-bar structure, so that the first seat body 3 and the second seat body 4 can maintain a constant angle, while one end of the upper arm 1 and the lower arm 2 is raised or lowered. The upper arm 1 and the lower arm 2 generally adopt a workpiece with a U-shaped cross section, which are nested with each other to form a spring cavity that can accommodate the spring assembly 5, and the spring assembly 5 is wrapped therein; the spring assembly 5 has a first end 51 and a second end 52, and the first end 51 is movably connected to the upper arm or the lower arm, preferably connected to the upper arm 1, so as to facilitate the adjustment of the spring preload, such as Figure 2 and Figure 4 .

[0030] The spring assembly 5 includes a spring 53, a nut seat 54 and a screw 55; the nut seat 54 is fixed to the end of the spring 53, and the threaded section of the screw 55 is screwed on the nut seat 54 to adjust the preload of the spring, and the head of the screw 55 and the end of the spring 53 constitute the first end 51 and the second end 52 of the spring assembly. The second end 52 of the spring assembly transmits force to the second seat body 4 through a lever 6, and the specific structure is as follows:

[0031] The lever 6 is axially positioned on the lower arm 2, one end of which is hinged to the second end 52 of the spring assembly, and the other end of which is machined with a gear surface 61; a fixed gear 62 is locked on the second seat body 4, and the gear surface of the fixed gear 62 meshes with the gear surface 61 on the lever to transmit the force and change the direction of the force; that is, the spring force of the spring assembly 5 is transmitted to the second seat body 4 by means of the lever 6 and the fixed gear 62.

[0032] To this end, one end of the spring 53 is directly bent into a hanging ring, and is hung on one end of the lever 6 by means of the hanging ring. In this example, the lever 6 passes through the bent hanging ring at the end of the spring through a hinge shaft, which is convenient for assembly; and in order to meet the different angle changes of the built-in spring assembly 5 when the support arm is adjusted in height, the screw head 551 is movably connected to the upper arm 1 through one of the following structures:

[0033] 1. If Figure 4 The screw head 551 passes through the through hole 11 reserved in the upper arm, and the contact surface between the screw head 551 and the through hole 11 is formed into an arc surface, allowing the screw 55 to swing relative to the through hole to meet the asynchronous change of the angle between the two;

[0034] 2. If Figure 6 The screw rod 55 passes through the hole opened in the middle of the hinge shaft 56, and is positioned on the upper arm 1 by the hinge shaft 56, allowing the screw rod 55 to swing up and down around the axis; and an end face bearing 57 is arranged between the screw rod head 551 and the hinge shaft 56, so that the adjustment of the preload force is smoother.

[0035] The upper arm 1 and lower arm 2, as well as the first seat body 3 and the second seat body 4 mentioned above, can be interchanged or swapped without affecting the structure and function of the adjustable support arm 100. Based on this example, a detachable wire management groove 21 can be provided on the corresponding lower arm 2 at the bottom, and the wire management groove 21 is pivoted on the reserved hole of the lower arm 2 through a slot pin 211 to form a detachable structure.

[0036] Reference Figure 3 , Figure 4 and Figure 5 A monitor stand assembled using the adjustable support arm 100 mentioned above also includes a base 7, a fixed arm 8 and a connecting plate 9 for hanging the monitor; the lower end of the fixed arm 8 is rotated and positioned on the base 7, and the upper end is rotated and positioned on the adjustable support arm 100, and the upper end of the adjustable support arm 100 is positioned on the connecting plate 9 through a cross axis to meet the adjustment of the left and right swing and pitch angle of the monitor.

[0037] In addition to being placed directly on the tabletop by using a counterweight, the base 7 can also be provided with a tabletop clamp, which is used to clamp the base 7 to the edge of the tabletop. The tabletop clamp includes an L-shaped support plate 71, an L-shaped clamping plate 72, and a bolt clamping plate 73; the L-shaped support plate 71 and the L-shaped clamping plate 72 are formed by bending a steel plate at a right angle, and have a vertical surface and a horizontal surface; the L-shaped support plate 71 is inverted and locked on the bottom surface of the base 7, and the vertical surface of the L-shaped clamping plate 72 is attached to and locked with the vertical surface of the L-shaped support plate 71, and a clamping opening is formed by the horizontal surfaces of the two; the bolt clamping plate 73 has a bolt handle 731 and a bowl-shaped clamping plate 732 fixed to the end of the bolt handle, and is rotated and positioned on the horizontal surface of the L-shaped clamping plate 72 by means of the bolt handle 731, forming a structure in which the distance between the bowl-shaped clamping plate 732 and the base 7 is adjustable, so as to be locked to the edge of the tabletop.

[0038] Furthermore, the vertical surface of the L-shaped support plate 71 is provided with more than two rows of threaded holes 711, and the vertical surface of the L-shaped clamp plate 72 is provided with a corresponding row of through holes 721, through which the fastening screws 74 are screwed on the threaded holes to form a locking structure. The through holes 721 on the L-shaped clamp plate are gourd holes that are larger at the bottom and smaller at the top, and the diameter of the large end of the gourd hole is larger than the head of the fastening screw 74. Only by loosening the fastening screw 74, the L-shaped clamp plate 72 can be removed for assembly and adjustment of the thickness of the table edge, which is also the benefit of setting multiple rows of threaded holes 711 on the L-shaped support plate 71.

[0039] The spring assembly 5 mentioned above may also be replaced by existing elastic devices such as gas springs.

Claims

1. An adjustable support arm, comprising an upper arm, a lower arm, a first seat, a second seat and a spring assembly; the upper arm, the lower arm, the first seat and the second seat are hinged to form a four-bar structure, and the upper arm and the lower arm are combined to form a spring cavity capable of accommodating the spring assembly; the spring assembly has a first end and a second end, and the first end is movably connected to the upper arm or the lower arm; characterized in that: It also includes a lever, the lever shaft is positioned on the lower arm or the upper arm, one end of the lever is hinged to the second end of the spring assembly, and the other end is processed with a gear surface; a fixed gear is locked on the second seat body, and the gear surface of the fixed gear is meshed with the gear surface on the lever; the spring force of the spring assembly is transmitted to the second seat body by means of the lever and the fixed gear.

2. The adjustable support arm according to claim 1, characterized in that: The spring assembly comprises a spring, a nut seat and a screw rod; the nut seat is fixed to the end of the spring, the threaded section of the screw rod is screwed on the nut seat, and the screw rod head and the end of the spring constitute the first end and the second end of the spring assembly.

3. The adjustable support arm according to claim 2, characterized in that: One end of the spring is directly bent to form a hanging ring, and is hung on one end of the lever with the help of the hanging ring; the screw head is movably connected to the upper arm or lower arm through one of the following structures:

1. The screw head passes through a through hole reserved in the upper arm or lower arm, and the contact surface between the screw head and the through hole is formed into an arc surface corresponding to the through hole, allowing the screw to swing relative to the through hole; 2. The screw passes through a hole opened in the middle of the hinge shaft, and is positioned on the upper arm or lower arm by the hinge shaft, allowing the screw to swing up and down around the shaft; an end face bearing is arranged between the screw head and the hinge shaft.

4. A monitor stand, comprising a base, a fixed arm and a connecting plate for hanging a monitor, and an adjustable support arm selected from claims 1 to 3; the lower end of the fixed arm is rotatably positioned on the base, and the upper end is rotatably positioned on the adjustable support arm, and the upper end of the adjustable support arm is positioned on the connecting plate through a cross axis; characterized in that: The base also has a desktop clamp, which includes an L-shaped support plate, an L-shaped clamp and a bolt clamp; the L-shaped support plate and the L-shaped clamp are formed by bending steel plates at right angles, and have a vertical surface and a horizontal surface; the L-shaped support plate is inverted and locked on the bottom surface of the base, and the vertical surface of the L-shaped clamp is affixed and locked together with the vertical surface of the L-shaped support plate, and a clamp is formed by the horizontal surfaces of the two; the bolt clamp has a bolt handle and a bowl-shaped clamp fixed to the end of the bolt handle, and is rotated and positioned on the horizontal plane of the L-shaped clamp by the bolt handle, forming a structure with an adjustable distance between the bowl-shaped clamp and the base.

5. A display stand according to claim 4, characterized in that: The vertical surface of the L-shaped support plate is provided with more than two rows of threaded holes, and the vertical surface of the L-shaped clamping plate is provided with a corresponding row of through holes, and the fastening screws pass through the through holes and are screwed on the threaded holes to form a locking structure.

6. A display stand according to claim 5, characterized in that: The through hole on the L-shaped splint is a gourd-shaped hole that is larger at the bottom and smaller at the top, and the diameter of the large end of the gourd-shaped hole is larger than the head of the fastening screw.

Images