Expansion bar

Abstract

The invention relates to an expansion bar, at least comprising a first slide bar and a second slide bar which are in sliding joint with each other, wherein the second slide bar is positioned on the upper part and is sleeved in the first slide bar. The expansion bar also comprises a nozzle, a clamping claw and a first locknut, wherein the lower part of the nozzle is fixed at the upper end of the first slide bar in a surrounding manner and the upper part thereof is provided with an external thread; the lower part of the clamping claw is arranged in the nozzle, and the upper part of the clamping claw, which is exposed out of the nozzle, is provided with a truncated cone-like peripheral surface and surrounds the second slide bar; and the first locknut is sleeved outside the clamping claw, the lower part of the first locknut is provided with an internal thread meshed with the external thread and the first locknut is provided with a truncated cone-like internal surface which extrudes the truncated cone-like peripheral surface and ensures the clamping claw to clasp the second slide bar. The expansion bar can maintain tight connection even on the oscillatory occasions to prevent rotation. Meanwhile, when accidentally falling down, the second slide bar can be cushioned, thus avoiding impact on the bottom. The lockpin component arranged on the expansion link can avoid detachment among the slide bars.

Description

technical field [0001] The invention relates to a telescopic rod. Background technique [0002] At present, lighting fixtures need to be lifted and lowered in many occasions to meet the needs of on-site lighting. This type of lighting fixture usually adopts a telescopic rod, and the light-emitting component is fixed on one end of the telescopic rod, and the height of the light-emitting component can be changed by adjusting the telescopic state of the telescopic rod. [0003] These telescopic rods have different structures and telescopic methods, and are mainly divided into mechanical telescopic rods, hydraulic telescopic rods, and pneumatic telescopic rods. Among them, the structure of the hydraulic telescopic rod and the pneumatic telescopic rod is relatively simple, but the cost is relatively high. The structure of the mechanical telescopic rod is relatively complicated, but the cost is low. [0004] The mechanical telescopic rods currently used, especially the multi-se...

AI Technical Summary

Problems solved by technology

Although the latch structure can solve the problems of anti-rotation and positioning, the latch is easy to fall off and break, especially in vibration situations.

In addition, the height of the extension will be limited by the positioning height

[0005] Mechanical telescopic rods are generally two-section type, which limits the telescopic length, and has the defect of not being able to withstand large side forces, making it even less firm in vibration situations

During the lifting process of the telescopic pole, before it is fixed, one of the poles is easy to fall, causing impact on the bottom, which may damage related components

When the telescopic pole is assembled with other components, the installation and fixing procedures are complicated and maintenance is inconvenient

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