GB2496670A - Telescopic ladder - Google Patents
Telescopic ladder Download PDFInfo
- Publication number
- GB2496670A GB2496670A GB201120003A GB201120003A GB2496670A GB 2496670 A GB2496670 A GB 2496670A GB 201120003 A GB201120003 A GB 201120003A GB 201120003 A GB201120003 A GB 201120003A GB 2496670 A GB2496670 A GB 2496670A
- Authority
- GB
- United Kingdom
- Prior art keywords
- locking pin
- ladder frame
- ladder
- spring
- frame tube
- 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.)
- Withdrawn
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C1/00—Ladders in general
- E06C1/02—Ladders in general with rigid longitudinal member or members
- E06C1/04—Ladders for resting against objects, e.g. walls poles, trees
- E06C1/08—Ladders for resting against objects, e.g. walls poles, trees multi-part
- E06C1/12—Ladders for resting against objects, e.g. walls poles, trees multi-part extensible, e.g. telescopic
- E06C1/125—Ladders for resting against objects, e.g. walls poles, trees multi-part extensible, e.g. telescopic with tubular longitudinal members nested within each other
Landscapes
- Ladders (AREA)
Abstract
A collapsible telescopic ladder is composed of several rungs, several ladder frame tubes 4, 7, 9 and bottom covers 5. The bottom covers are mounted at the lower end of the ladder frame tubes. There is a latch on every rung and is composed of a spring-loaded locking pin 2. There is a locking pin hole in every ladder frame tube which matches with the locking pin. The projecting end of the locking pin is spherical. A taper on every bottom cover engages the sphere of the locking pin to push it out of supporting engagement with the adjacent ladder frame tube. A button 1 may be provided on the locking pin.
Description
A KIND OF ROUND TUBE EXTENSION LADDER
This invention refers to a kind ol round tube extension ladder, especially a kind of round tube extension ladder which is convenient to fold and extend.
The existing round tube extension ladders are folded from up to down or down to up, and are extended from up to down or down to up, so they are disadvantages in folding and extending.
This invention intends to provide a kind of round tube extension ladder which is convenient to fold and extend.
In order to achieve the above aim, this invention adopts the following technical solutions.
This kind of round tube extension ladder is composed of several rungs, several ladder frame tubes and bottom covers. Those bottom covers are mounted at the lower end of ladder frame tubes. There is a switch on every rung which is featured in: the above-mentioned switch is composed of a locking pin and a spring; one end of the locking pin holds down the spring; the spring is mounted in every rung; there is a locking pin hole in every ladder frame tube which matches with the locking pin; the locking pin at end of the locking pin hole is spherical; slope of every bottom cover matches with the sphere.
There is a button on the above-mentioned locking pin.
Comparing with the existing technology, this invention is advantageous in: Extending procedure of this kind of round tube extension ladder: locking pins lock every rung under the action of every compression spring. Its folding procedure: after pressing the button manually, the locking pin presses spring and draws back; the top ladder frame tube declines under the action of gravity; when bottom cover of the top ladder frame tube contacts locking pin of the third rung, slope of the bottom cover presses the sphere in the front of the locking pin, and the bottom cover presses the spring to compress under the action of impulse and gravity; when the locking pin draws back till locking pin hole of the second ladder frame tube contacts sphere of the locking pin, the locking pin is unable to button up the second ladder frame tube, so that the second ladder frame tube declines under the action of gravity; when bottom cover of the second ladder frame tube keeps declining and contacts locking pin of the fourth rung, slope of the bottom cover presses the sphere in the front of the locking pin; the bottom cover presses the spring to compress under the action of impulse and gravity; when the locking pin draws back till locking pin hole of the third ladder frame tube contacts sphere of the locking pin, the locking pin is unable to button up the third ladder frame tube, so that the third ladder frame tube declines under the action of gravity; accordingly, under the action of impulse and gravity, every ladder frame tube will be folded through the acting force of slope and sphere. This kind of round tube extension ladder referred to in the invention controls the whole ladder through a pair of manual locking pins; locking pins of other rungs are controlled by an automatic device.
Fig. 1 is structure diagram of this kind of round tube extension ladder referred to in the invention.
The invention will be further described with reference to the preferred embodiments.
As shown in Fig. 1, this kind of round tube extension ladder referred to in the invention is composed of several rungs, several ladder frame tubes and bottom covers.
Those bottom covers are mounted at the lower end of ladder frame tubes. Every switch is composed of a locking pin and a spring; one end of every locking pin holds down the spring; the spring is mounted in every rung; there is a locking pin hole in every ladder frame tube which matches with the locking pin; the locking pin at end of the locking pin hole is spherical; slope of every bottom cover matches with the sphere. There is a button on the locking pin. Extending procedure of this kind of round tube extension ladder: locking pins lock every rung under the action of every compression spring.
Folding procedure: after pressing button (1) manually, locking pin (2) presses spring (3) and draws back; the top ladder frame tube (4) declines under the action of gravity; when bottom cover (5) of the top ladder frame tube contacts locking pin of the third rung (6), slope of the bottom cover presses the sphere in the front of the locking pin, and the bottom cover presses the spring to compress under the action of impulse and gravity; when the locking pin draws back till locking pin hole of the second ladder frame tube (7) contacts sphere of the locking pin, the locking pin is unable to button up the second ladder frame tube, so that the second ladder frame tube declines under the action of gravity; when bottom cover of the second ladder frame tube keeps declining and contacts locking pin of the fourth rung (8), slope of the bottom cover presses the sphere in the front of the locking pin; the bottom cover presses the spring to compress under the action of impulse and gravity; when the locking pin draws back till locking pin hole of the third ladder frame tube (9) contacts sphere of the locking pin, the locking pin is unable to button up the third ladder frame tube, so that the third ladder frame tube declines under the action of gravity; accordingly, under the action of impulse and gravity, every ladder frame tube will be folded through the acting force of slope and sphere. This kind of round tube extension ladder referred to in the invention controls the whole ladder through a pair of manual locking pins; locking pins of other rungs are controlled by an automatic device.
Claims (1)
- <claim-text>CLAIMS1. A kind of round tube extension ladder is composed of several rungs, several ladder frame tubes and bottom covers; those bottom covers are mounted at the lower end of ladder frame tubes; there is a switch on every rung which is featured in: the above-mentioned switch is composed of a locking pin and a spring; one end of the locking pin holds down the spring; the spring is mounted in every rung; there is a locking pin hole in every ladder frame tube which matches with the locking pin; the locking pin at end of the locking pin hole is spherical; slope of every bottom cover matches with the sphere.</claim-text> <claim-text>2. According to claim 1, this kind of round tube extension ladder is featured in: there is a button on the above-mentioned locking pin.</claim-text>
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB201120003A GB2496670A (en) | 2011-11-21 | 2011-11-21 | Telescopic ladder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB201120003A GB2496670A (en) | 2011-11-21 | 2011-11-21 | Telescopic ladder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB201120003D0 GB201120003D0 (en) | 2012-01-04 |
| GB2496670A true GB2496670A (en) | 2013-05-22 |
Family
ID=45475430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB201120003A Withdrawn GB2496670A (en) | 2011-11-21 | 2011-11-21 | Telescopic ladder |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2496670A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105672863A (en) * | 2014-11-17 | 2016-06-15 | 国家电网公司 | Slideway-type insulation telescoping work ladder |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996002727A1 (en) * | 1994-07-14 | 1996-02-01 | Mach Et Vertriebsgesellschaft Br Sabine Bolwin & Jürgen Hoppe | Telescopic ladder |
| WO2002101189A1 (en) * | 2001-06-13 | 2002-12-19 | Telesteps Ab | Collapsible ladder |
| CN201507234U (en) * | 2009-09-30 | 2010-06-16 | 杨建明 | One-way extension ladder |
-
2011
- 2011-11-21 GB GB201120003A patent/GB2496670A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996002727A1 (en) * | 1994-07-14 | 1996-02-01 | Mach Et Vertriebsgesellschaft Br Sabine Bolwin & Jürgen Hoppe | Telescopic ladder |
| WO2002101189A1 (en) * | 2001-06-13 | 2002-12-19 | Telesteps Ab | Collapsible ladder |
| CN201507234U (en) * | 2009-09-30 | 2010-06-16 | 杨建明 | One-way extension ladder |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105672863A (en) * | 2014-11-17 | 2016-06-15 | 国家电网公司 | Slideway-type insulation telescoping work ladder |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201120003D0 (en) | 2012-01-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |