Pillar profile structure and climbing ladder using same

Abstract

A pillar profile structure and a climbing ladder using the pillar profile structure, the pillar profile structure comprises an outer pillar (1) and an inner pillar (2) which are nested inside and outside, both the outer pillar (1) and the inner pillar (2) are profiles, the pillar profile structure is characterized in that the cross section of the inner pillar (2) is rectangular, and the four corners of the rectangle are provided with lead angles (21); a pair of positioning convex ribs (11) corresponding to each lead angle (21) of the inner column (2) is arranged on the inner wall of the outer column (1), and the two positioning convex ribs (11) of each pair of positioning convex ribs (11) are arranged on the two sides of the corresponding lead angle (21) respectively; seen from the cross section, the end parts, facing the inner column (2), of the positioning convex ribs (11) are arc-shaped ends, and the arc-shaped ends abut against the outer surface of the inner column (2) and are in sliding fit with the outer surface of the inner column (2); therefore, at least eight linear contacts exist between the inner column (2) and the outer column (1).

Description

TECHNICAL FIELD

[0001] The utility model relates to a climbing ladder, in particular to a telescopic support and a climbing ladder using the same. BACKGROUND

[0002] The telescopic support of the climbing ladder is a support with adjustable length, which is usually composed of an inner column and an outer column. The inner column can move freely in the inner cavity of the outer column and is locked at the desired length by a fixing structure. This design makes the ladder adaptable to different height requirements, facilitating carrying and storage.

[0003] Most of the ladders are made of aluminum alloy, and the outer column and the inner column of the support are also made of aluminum alloy. In the existing design, one is to directly slide the inner column and the outer column in face-to-face contact. However, it is difficult to control the gap size between the faces, and either the sliding is too loose or the contact between the faces is too tight, resulting in excessive sliding friction and scratches on the surface of the inner column. The second is to design a plastic end at the end of the inner column, which slides in contact with the inner cavity of the outer column. However, the sliding contact section in the length direction of the support is too short, and the guiding performance is poor. SUMMARY

[0004] The utility model aims to provide a support profile structure and a climbing ladder using the same, in order to improve the adaptability of the sliding cooperation between the inner column and the outer column.

[0005] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of a support profile structure, which comprises an outer column and an inner column nested with each other. Both the outer column and the inner column are profiles. The cross section of the inner column is rectangular, and the four corners of the rectangle are provided with guide angles. The inner wall of the outer column is provided with a pair of positioning ribs corresponding to each guide angle of the inner column. The two positioning ribs of each pair of positioning ribs are arranged on the two sides of the corresponding guide angle. The end of the positioning rib facing the inner column is arc-shaped in cross section, and the arc-shaped end is in abutting and sliding cooperation with the outer surface of the inner column. In this way, there are at least 8 line contacts between the inner column and the outer column.

[0006] In the above-mentioned scheme, a weight-reducing groove is concavely arranged on the inner wall of the outer column between the two positioning ribs of each pair of positioning ribs.

[0007] In the above-mentioned scheme, an opening is formed on one side of the outer column, so that the cross section of the outer column is C-shaped.

[0008] In the above-mentioned scheme, the bottom of the outer column is bent outward to form a bent section, and the included angle α between the bent section and the axis of the inner column is 7°~10°.

[0009] To achieve the above objectives, the technical solution of the climbing ladder adopted by this utility model is as follows: A climbing ladder includes a support profile structure, which includes an outer column and an inner column nested together. Both the outer column and the inner column are profiles. The cross-section of the inner column is rectangular, and the four corners of the rectangle are provided with chamfers. The inner wall of the outer column is provided with a pair of positioning ribs corresponding to each chamfer of the inner column. The two positioning ribs of each pair of positioning ribs are respectively located on both sides of the corresponding chamfer. In cross-section, the end of the positioning rib facing the inner column is an arc-shaped end, which abuts and slides against the outer surface of the inner column. Thus, there are at least 8 line contacts between the inner column and the outer column.

[0010] In the above scheme, a weight-reducing groove is recessed on the inner wall of the outer column at the position between the two positioning protrusions of each pair of positioning protrusions.

[0011] In the above scheme, an opening is provided on one side of the outer column, making the cross-section of the outer column C-shaped.

[0012] In the above scheme, the bottom of the outer column is bent outward to form a bent section, and the angle α between the bent section and the axial direction of the inner column is 7°~10°.

[0013] The advantages of this invention are: because there are 8 specific line contact sliding guides between the outer column and the inner column, the guide is stable and the fit dimensions are easy to control, so that the sliding between the outer column and the inner column is smooth and will not wear each other too much. Attached Figure Description

[0014] Fig. 1 This is a three-dimensional schematic diagram of the column structure in Embodiment 1 of this utility model;

[0015] Fig. 2 This is a side plan view of the column structure according to Embodiment 1 of this utility model;

[0016] Fig. 3 This is a schematic diagram of the cross-section of the column according to Embodiment 1 of this utility model.

[0017] In the above image:

[0018] 1. Outer column; 11. Positioning rib; 12. Weight reduction groove; 13. Opening; 14. Bending section;

[0019] 2. Inner column; 21. Chamfer. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0021] Example 1: See Figs. 1-3 As shown, a column profile structure:

[0022] SeeFigs. 1-3 As shown, the structure includes an outer column 1 and an inner column 2 nested together, both of which are profiles.

[0023] See Fig. 3 As shown, the inner column 2 has a rectangular cross-section, and the four corners of the rectangle are provided with chamfered corners 21.

[0024] See Fig. 3 As shown, the inner wall of the outer column 1 is provided with a pair of positioning ribs 11 corresponding to each guide angle 21 of the inner column 2. The two positioning ribs 11 of each pair of positioning ribs 11 are respectively located on both sides of the corresponding guide angle 21. In the cross-section, the end of the positioning rib 11 facing the inner column 2 is an arc-shaped end, which abuts and slides against the outer surface of the inner column 2. Thus, there are at least 8 line contacts between the inner column 2 and the outer column 1.

[0025] See Fig. 3 As shown, a weight-reducing groove 12 is recessed on the inner wall of the outer column 1 between the two positioning ribs 11 of each pair of positioning ribs to reduce weight and save materials, and at the same time increase the strength of the outer column profile.

[0026] See Figs. 1-3 As shown, an opening 13 is provided on one side of the outer column 1, making the cross-section of the outer column 1 C-shaped. Furthermore, the bottom of the outer column 1 is bent outwards to form a bent section 14, and the angle α between this bent section 14 and the axial direction of the inner column 2 is 7°~10°. The angle α is as follows: Fig. 2 The design, as indicated in the text, aims to expand the support surface to the ground and enhance the stability of the support.

[0027] In this embodiment, there are eight specific line contact sliding guides between the outer and inner columns, which provide good guidance stability and make the mating dimensions easy to control, so that the sliding between the outer and inner columns is smooth and does not cause excessive wear on each other.

[0028] Of course, in practice, more contact points can be added between the inner column 2 and the outer column 1, but in general, the above 8 line contacts are already stable enough and provide smooth guidance.

[0029] Example 2: See Figs. 1-3 As shown, a type of climbing ladder:

[0030] The overall structure of the climbing ladder can be an A-frame ladder, or it can be a straight ladder, scaffolding, etc., as long as it includes the support profile structure described in Embodiment 1 above. The specific support profile structure is as described in Embodiment 1, and its advantages are the same as in Embodiment 1, so it will not be repeated here.

[0031] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A column profile structure, comprising an outer column (1) and an inner column (2) nested together, wherein both the outer column (1) and the inner column (2) are profiles, characterized in that: The inner column (2) has a rectangular cross-section, and the four corners of the rectangle are provided with chamfers (21); the inner wall of the outer column (1) is provided with a pair of positioning ribs (11) corresponding to each chamfer (21) of the inner column (2), and the two positioning ribs (11) of each pair of positioning ribs (11) are respectively located on both sides of the corresponding chamfer (21); in the cross-section, the end of the positioning rib (11) facing the inner column (2) is an arc end, and the arc end is in contact with the outer surface of the inner column (2) for sliding fit; thus, there are at least 8 line contacts between the inner column (2) and the outer column (1).

2. The column profile structure according to claim 1, characterized in that: The inner wall of the outer column (1) is provided with a weight-reducing groove (12) between the two positioning protrusions (11) of each pair of positioning protrusions.

3. The column profile structure according to claim 1, characterized in that: An opening (13) is provided on one side of the outer column (1), so that the cross-section of the outer column (1) is C-shaped.

4. The column profile structure according to claim 1, characterized in that: The bottom of the outer column (1) is bent outward to form a bent section (14), and the angle α between the bent section (14) and the axial direction of the inner column (2) is 7°~10°.

5. A climbing ladder, characterized in that: Includes the column profile structure of claim 1.

6. The climbing ladder according to claim 5, characterized in that: The inner wall of the outer column (1) is provided with a weight-reducing groove (12) between the two positioning protrusions (11) of each pair of positioning protrusions.

7. The climbing ladder according to claim 5, characterized in that: An opening (13) is provided on one side of the outer column (1), so that the cross-section of the outer column (1) is C-shaped.

8. The climbing ladder according to claim 5, characterized in that: The bottom of the outer column (1) is bent outward to form a bent section (14), and the angle α between the bent section (14) and the axial direction of the inner column (2) is 7°~10°.

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