Adjustable supporting arm

Abstract

The invention relates to an adjustable supporting arm which 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, the spring assembly arranged between the upper arm and the lower arm is provided with a first end and a second end, and the first end is movably connected with the upper arm or the lower arm; the adjustable supporting arm further comprises a first connecting rod and a second connecting rod, one end of the first connecting rod is hinged to the upper arm or the lower arm, one end of the second connecting rod is hinged to the first seat body or the second seat body, the other end of the second connecting rod is hinged to the first connecting rod, and a small four-connecting-rod structure is formed; the second end of the spring assembly is hinged to the first connecting rod, a hinge point changes along with height adjustment of the supporting arm, a stroke difference value of the spring assembly is reduced, the spring force is kept relatively constant, the supporting arm does not droop when adjusted to the highest point and does not rebound when adjusted to the lowest point, and the requirement of daily work is met.

Description

Technical field: [0001] The invention relates to an adjustable support arm, especially when the support arm is adjusted to a height limit position, the built-in spring mechanism has a force close to constant. Background technique: [0002] The adjustable stand of the monitor has been widely used in the industrial and civil fields for a long time, providing people with a more humane operation and viewing angle. Most of its structure adopts parallel four-bar linkage mechanism, and maintains the hovering angle with the help of spring force. In design, the spring force is adjusted by the spring force of the moment required for the horizontal position of hovering. When the cantilever is adjusted to the limit position of pitching, due to the spring Stretching causes the spring force to increase sharply. It often sags when it is adjusted to the highest point, and rebounds when it is adjusted to the lowest point. To this end, the industry has made the following improvements: [00...

AI Technical Summary

Problems solved by technology

The spring assembly uses one end to contact the cam surface to shorten the stroke difference of the spring assembly when the support arm is adjusted from horizontal to pitch limit position, that is, to minimize the length change of the spring in the spring assembly, but the cam radius difference is still Limited, it only plays an improving role, and it is difficult to completely overcome the defects in the existing technical structure

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