A multi-stage telescoping device

Abstract

The utility model relates to a kind of multistage telescopic devices, comprising: n telescopic sections and m rolling components;N telescopic sections are stacked in inner and outer layers. The inner end of inner layer telescopic section is provided with rolling component, and the rolling component is matched with the telescopic section outside it. The outer end of outer layer telescopic section is provided with rolling component, and the rolling component is matched with the telescopic section inside it. The inner and outer ends of each the intermediate telescopic section are respectively provided with rolling component, and the rolling component located in inner end is matched with the telescopic section outside it, and the rolling component located in outer end is matched with the telescopic section inside it. N is a natural number greater than or equal to 2;N, m satisfy the following relationship: m=2n-2. The multistage telescopic device replaces the structure mode of transmission slide rail and sliding slot cooperation, and the rolling component is not prone to deformation, which can solve the technical problem that telescopic arm cannot be normally stretched or contracted due to deformation.

Claims

1. A multi-stage telescopic device, characterized in that: include: n expansion joints and m rolling components; n expansion joints are stacked inside and out; The innermost expansion joint is defined as the inner expansion joint, the outermost expansion joint is defined as the outer expansion joint, and one or more expansion joints between the outer expansion joint and the inner expansion joint are defined as intermediate expansion joints. The inner end of the inner expansion joint is provided with a rolling component, and the rolling component cooperates with the expansion joint on its outer side. The outer end of the outer expansion joint is provided with a rolling component, and the rolling component cooperates with the expansion joint on its inner side. Each of the intermediate expansion joints is provided with rolling components at its inner and outer ends, and the rolling component at the inner end cooperates with the expansion joint at its outer end, and the rolling component at the outer end cooperates with the expansion joint at its inner end. The n is a natural number greater than or equal to 2; n and m satisfy the following relationship: m = 2n - 2.

2. The multi-stage telescopic device according to claim 1, characterized in that: The expansion joint has a square sleeve structure.

3. The multi-stage telescopic device according to claim 2, characterized in that: The rolling assembly includes a first roller, a second roller, a third roller, and a fourth roller; the first roller, the second roller, the third roller, and the fourth roller are installed one-to-one on the four surfaces of the expansion joint.

4. The multi-stage telescopic device according to claim 1, characterized in that: Also includes: Connecting rod; one end of the connecting rod is fixedly connected to the outer end of the inner expansion joint.

5. The multi-stage telescopic device according to claim 1, characterized in that: Also includes: Mounting component; the mounting component is fixed to the outside of the outer expansion joint.

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