CN205778457U - A kind of extension ladder - Google Patents
A kind of extension ladder Download PDFInfo
- Publication number
- CN205778457U CN205778457U CN201620463064.XU CN201620463064U CN205778457U CN 205778457 U CN205778457 U CN 205778457U CN 201620463064 U CN201620463064 U CN 201620463064U CN 205778457 U CN205778457 U CN 205778457U
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- CN
- China
- Prior art keywords
- ladder
- bars
- extension
- utility
- model
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
This utility model relates to ladder technical field, particularly relates to a kind of extension ladder.A kind of extension ladder of the present utility model, including at least three-section ladder unit, ladder unit includes step and two ladder bars, the two ends of step are individually fixed in two ladder bars, mutually it is slidably socketed by ladder bars between adjacent terraced unit, the internal diameter of the ladder bars being mutually slidably socketed increases the most successively, and the cross section of the perisporium of described ladder bars is curvilinear boundary quadrilateral.A kind of extension ladder of the present utility model, cross section is the ladder bars of curvilinear boundary quadrilateral, Stability Analysis of Structures, and anti-shear ability is strong, makes ladder the most stable, firm, improves the security performance of extension ladder of the present utility model.
Description
Technical field
This utility model relates to ladder technical field, particularly relates to a kind of extension ladder.
Background technology
People's daily life and some career field all can be commonly used to ladder.Ladder has been a kind of instrument that people commonly use.Ladder in the past mostly is the ladder of fixing non-telescoping change, the heaviest during carrying and use, and is also required to a bigger space when depositing.For disadvantages mentioned above, existing ladder provides telescopic ladder, is in contraction state when not in use, takes up room little, it is easy to carrying.When it is desired to be used, extension ladder stretching is launched and is positioned can use, very convenient.
Being formed owing to this telescopic ladder is substantially mutually to be socketed by multiple ladder bars, after deployment, the toughness between each ladder bars is inadequate, and this brings potential safety hazard to user.
It is therefore desirable to provide the extension ladder that a kind of ability to bear is strong.
Utility model content
The purpose of this utility model is to provide a kind of extension ladder for the deficiencies in the prior art, and Stability Analysis of Structures, anti-shear ability is strong.
For achieving the above object, a kind of extension ladder of the present utility model, including at least three-section ladder unit, ladder unit includes step and two ladder bars, the two ends of step are individually fixed in two ladder bars, mutually being slidably socketed by ladder bars between adjacent terraced unit, the internal diameter of the ladder bars being mutually slidably socketed increases the most successively, and the cross section of the perisporium of described ladder bars is curvilinear boundary quadrilateral.
Preferably, two ladder bars in described ladder unit are arranged symmetrically with.
Preferably, described curvilinear boundary quadrilateral includes three curl and a straight flange.
Preferably, the length of two relative described curl is equal.
Preferably, the curl convex of described curvilinear boundary quadrilateral.
Preferably, the line on the summit that described curvilinear boundary quadrilateral is adjacent constitutes trapezoidal.
Preferably, described trapezoidal for isosceles trapezoid.
Preferably, the length of the waist of described isosceles trapezoid is equal to the length at the end of one of them of isosceles trapezoid.
Preferably, the outer wall of described ladder bars is provided with some arc grooves.
The beneficial effects of the utility model: a kind of extension ladder of the present utility model, cross section is the ladder bars of curvilinear boundary quadrilateral, Stability Analysis of Structures, and anti-shear ability is strong, makes ladder the most stable, firm, improves the security performance of extension ladder of the present utility model.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is forward sight structural representation of the present utility model.
Fig. 3 is plan structure schematic diagram of the present utility model.
Fig. 4 is the sectional structure schematic diagram in A-A direction in Fig. 2.
Fig. 5 is the partial enlargement structural representation in Fig. 4 at B.
Reference includes:
1 ladder unit
11 steps
12 ladder bars
21 curl
22 straight flanges
3 arc grooves.
Detailed description of the invention
Below in conjunction with accompanying drawing, this utility model is described in detail.
As shown in Fig. 1 ~ Fig. 4, a kind of extension ladder of the present utility model, including at least three-section ladder unit 1, ladder unit 1 includes step 11 and two ladder bars 12, the two ends of step 11 are individually fixed in two ladder bars 12, mutually being slidably socketed by ladder bars 12 between adjacent terraced unit 1, the internal diameter of the ladder bars 12 being mutually slidably socketed increases the most successively, and the cross section of the perisporium of described ladder bars 12 is curvilinear boundary quadrilateral.The cross section of the perisporium of the ladder bars 12 of each ladder unit 1 is similar curvilinear boundary quadrilateral, a kind of extension ladder of the present utility model, comprise 13 terraced unit 1, by other securing member, adjacent terraced unit 1 position can be locked after deployment, cross section is the ladder bars 12 of curvilinear boundary quadrilateral, Stability Analysis of Structures, and anti-shear ability is strong, make ladder the most stable, firm, improve the security performance of extension ladder of the present utility model.
Preferably, two ladder bars 12 in described ladder unit 1 are arranged symmetrically with, and claim to arrange ladder bars 12 appearance looks elegant, the power being subject to can be evenly distributed in two ladder bars 12, improve stability and the reliability of extension ladder of the present utility model, further increase the security performance of extension ladder of the present utility model.
Concrete, described curvilinear boundary quadrilateral includes three curl 21 and a straight flange 22, the summit rounding off of curvilinear boundary quadrilateral of the present utility model, three curl 21 improve the mechanical property of ladder bars 12, further increase the anti-shear ability of ladder bars 12 of the present utility model.It is further preferred that the length of relative two described curl 21 is equal.
As shown in Figure 4, curl 21 convex of described curvilinear boundary quadrilateral.In the present embodiment, the center of curvature of curl 21 is arranged in the range of curvilinear boundary quadrilateral surrounds, and convex curvilinear boundary quadrilateral anti-shear ability is higher, and mechanical property can add stable, further increases the security performance of extension ladder of the present utility model
As shown in Figure 4, the line on the summit that described curvilinear boundary quadrilateral is adjacent constitutes trapezoidal.It is further preferred that it is described trapezoidal for isosceles trapezoid.Further preferred, the length of the waist of described isosceles trapezoid is equal to the length at the end of one of them of isosceles trapezoid.
As it is shown in figure 5, the outer wall of described ladder bars 12 is provided with some arc grooves 3.Arc groove 3 avoids the ladder bars 12 of adjacent ladder to fit completely when being socketed cannot launching of causing, and improves the ease of use of extension ladder of the present utility model.
Understanding this utility model in sum is to have above-described good characteristic, is made it on using, promotes the usefulness not having in conventional art and have practicality, become the product of a great practical value.
Above content is only preferred embodiment of the present utility model, for those of ordinary skill in the art, according to thought of the present utility model, the most all will change, this specification content should not be construed as restriction of the present utility model.
Claims (9)
1. an extension ladder, including at least three-section ladder unit (1), it is characterized in that: ladder unit (1) includes step (11) and two ladder bars (12), the two ends of step (11) are individually fixed in two ladder bars (12), mutually it is slidably socketed by ladder bars (12) between adjacent terraced unit (1), the internal diameter of the ladder bars (12) being mutually slidably socketed increases the most successively, and the cross section of the perisporium of described ladder bars (12) is curvilinear boundary quadrilateral.
A kind of extension ladder the most according to claim 1, it is characterised in that: two ladder bars (12) in described ladder unit (1) are arranged symmetrically with.
A kind of extension ladder the most according to claim 1, it is characterised in that: described curvilinear boundary quadrilateral includes three curl (21) and a straight flange (22).
A kind of extension ladder the most according to claim 3, it is characterised in that: the length of two relative described curl (21) is equal.
A kind of extension ladder the most according to claim 1, it is characterised in that: curl (21) convex of described curvilinear boundary quadrilateral.
A kind of extension ladder the most according to claim 1, it is characterised in that: the line on the summit that described curvilinear boundary quadrilateral is adjacent constitutes trapezoidal.
A kind of extension ladder the most according to claim 6, it is characterised in that: described trapezoidal for isosceles trapezoid.
A kind of extension ladder the most according to claim 7, it is characterised in that: the length of the waist of described isosceles trapezoid is equal to the length at the end of one of them of isosceles trapezoid.
A kind of extension ladder the most according to claim 1, it is characterised in that: the outer wall of described ladder bars (12) is provided with some arc grooves (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620463064.XU CN205778457U (en) | 2016-05-20 | 2016-05-20 | A kind of extension ladder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620463064.XU CN205778457U (en) | 2016-05-20 | 2016-05-20 | A kind of extension ladder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205778457U true CN205778457U (en) | 2016-12-07 |
Family
ID=58116520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620463064.XU Expired - Fee Related CN205778457U (en) | 2016-05-20 | 2016-05-20 | A kind of extension ladder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205778457U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106988668A (en) * | 2017-03-27 | 2017-07-28 | 陕西科技大学 | The telescopic mechanical feed ladder of timing belt and application method |
-
2016
- 2016-05-20 CN CN201620463064.XU patent/CN205778457U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106988668A (en) * | 2017-03-27 | 2017-07-28 | 陕西科技大学 | The telescopic mechanical feed ladder of timing belt and application method |
| CN106988668B (en) * | 2017-03-27 | 2019-05-03 | 陕西科技大学 | The telescopic mechanical feed ladder of synchronous belt and application method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161207 Termination date: 20170520 |