CN101294479A - Telescopic ladder - Google Patents
Telescopic ladder Download PDFInfo
- Publication number
- CN101294479A CN101294479A CNA2007100276543A CN200710027654A CN101294479A CN 101294479 A CN101294479 A CN 101294479A CN A2007100276543 A CNA2007100276543 A CN A2007100276543A CN 200710027654 A CN200710027654 A CN 200710027654A CN 101294479 A CN101294479 A CN 101294479A
- Authority
- CN
- China
- Prior art keywords
- telescoping tube
- extension ladder
- joystick
- ladder
- crossbeam
- 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.)
- Granted
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Classifications
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- 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
Abstract
The invention discloses an extension ladder. The prior extension ladder has inconvenience in use such as the difficult in controlling the extension and the contraction of the ladder by one hand. The invention includes a left and a right vertical ladder pillars comprising a plurality of expansion pipes which are overlapped and nested with each other. The left and the right vertical ladder pillars are connected with a corresponding beam through a connecting device to form a ladder section. A locking device is arranged in the middle of the beam for simultaneously locking the adjacent inner and outer expansion pipes on the left and on the right. The locking device comprises a left locking rod and right locking rods which are arranged along the beam direction, and a spring arranged in the middle of the beam. Control handles which are connected through a spring are arranged at the corresponding ends of the left and the right locking rods. Overlapped locating holes are formed at the positions of the overlapping adjacent expansion pipes after being expanded corresponding to the free ends of the left and the right locking rods. The free ends of the left and right locking rods are inserted into the corresponding locating holes under the action of the spring. Compared with prior structure, the extension ladder is easier in use, because locking can be unlocked by simultaneously pulling the left and the right locking rods with only one hand.
Description
Technical field
The present invention relates to a kind of ladder, particularly a kind of extension ladder that can change ladder length.
Technical background
In daily production and life, often to use ladder.The length of ladder at present commonly used can not be regulated, and makes to collect and carry very inconvenience.Chinese patent CN2268119Y discloses a kind of extension ladder, and this ladder is divided into the vertical support of three joints, connects each joint support by horizontal holding, and in horizontal two ends of holding spring and steady pin is housed.When drawing ladder in, the left hand and the right hand are stirred the horizontal steady pin that holds two ends respectively, remove the locking relation between any two that supports successively, then will go up a joint by external force or other staff and support and be contracted in next joint supports.The extension ladder of this structure, the cooperation of a plurality of staff of needs just makes things convenient for the stretching, extension or the contraction of ladder, makes troubles to use.
Summary of the invention
The technical problem to be solved in the present invention is to overcome the inconvenience that existing extension ladder stretches and shrinks, and a kind of extension ladder of one-hand operation is provided.
The technical scheme that realizes extension ladder of the present invention is: a kind of extension ladder, comprise by some joints step by step the nestable telescoping tube of slippage form about upright cleat stanchion, the upright cleat stanchion in a left side and right upright cleat stanchion connect into some section of ladders by linkage and corresponding crossbeam, it is characterized in that: the locking device that is provided with the installation site of adjacent inside and outside telescoping tube with the right side, adjacent inside and outside telescoping tube installation site on the left of locking simultaneously in the middle part of the described crossbeam.
Described locking device comprises the left and right securing rod and the spring that is located at the crossbeam middle part along the setting of crossbeam length direction, the opposite end of left and right securing rod is respectively equipped with joystick, and connect by spring, stretch back and the corresponding position of left and right securing rod free end at nestable adjacent expansion pipe, be provided with overlapped locating hole, the free end of left and right securing rod inserts under the effect of spring in the corresponding locating hole.
Described crossbeam is the I-shaped pipe that the middle part has cornical, and left and right securing rod and spring are installed in the cornical, is provided with to be convenient to corresponding joystick and to stretch out strip hole with translation on the tube wall of cornical.The cross section of cornical is dolioform.
Further improve as of the present invention, be provided with movable security bar between the described joystick, an end of security bar is hinged on the joystick of a side, and the free end overhead is on the joystick of an opposite side.Security bar is provided with the draw-in groove that an opposite side joystick with hinged end is interlocked.The user can stir joystick like this, and the joystick of a side is fastened in the draw-in groove, removing the locking between each section of ladder of extension ladder, and keeps this state that unlocks by draw-in groove, and then disposable extension ladder is shunk.If under the situation of double ladder, can also remove earlier the locking between the section of ladder of the left side respectively, and by this state that unlocks of draw-in groove maintenance, and then the locking between the corresponding section of ladder on the right of removing, and, shrink the section of ladder of the right and left at last simultaneously by this state that unlocks of draw-in groove maintenance.
Further improve as of the present invention, be provided with block rubber between the described nestable adjacent inside and outside telescoping tube, block rubber is provided with bayonet socket and step, interior telescoping tube lower end and outer telescoping tube upper end are respectively equipped with to the stamping forming buckle of inwall, the buckle of interior telescoping tube snaps in the bayonet socket of block rubber, and the fastening of outer telescoping tube buckle is on the step of block rubber.The cross section of described telescoping tube is dolioform, because have two relative planes on the dolioform telescoping tube, therefore is convenient to punching press buckle on this plane.
One end of linkage is fixedlyed connected with crossbeam, and the other end is the interior shape size opening consistent with an outer telescoping tube cross section folder, and on the telescoping tube, the both sides of its opening are fixedly connected by securing member outside for the opening mounting board.The weight major part that stands on the crossbeam of user is transferred on the corresponding telescoping tube by linkage like this, and can all not be supported on the left and right securing rod, makes the extension ladder life-span longer, more durable.
Because the control section of extension ladder locking device of the present invention is arranged on the middle part of crossbeam, therefore only needs one hand just can spur left and right securing rod simultaneously and unlock.With respect to structure in the past, use more convenient.And adopted crossbeam especially with special cross-section shape, and make whole locking device partly to slide along the cornical of crossbeam, move more reliable.Its joystick is hidden between upper and lower two flat boards of I-shaped crossbeam, can not make because of unexpected collision and extension ladder unexpected contraction under user mode bring danger to operating personnel.Simultaneously, the present invention has also increased safety device (being security bar), the setting of this security bar, both can avoid mistake to stir locking bar causes the extension ladder contraction to meet accident, or prevent to cause under the spring failure situation extension ladder contraction to meet accident, but also can make locking device keep the state that unlocks, be convenient to the contraction of extension ladder.
Description of drawings
Below in conjunction with drawings and the specific embodiments extension ladder of the present invention is described further.
Accompanying drawing 1 is a word extension ladder stereogram in the embodiment of the invention 1;
Accompanying drawing 2 is the exploded view of locking device among Fig. 1;
Accompanying drawing 4 is the enlarged drawing of adjacent expansion pipe 11,12 junctions among Fig. 1;
Accompanying drawing 5 is the stereogram of locking device among Fig. 1;
Accompanying drawing 6 is the vertical view of security bar among Fig. 5;
Accompanying drawing 7 is the sectional view of telescoping tube among Fig. 1;
Accompanying drawing 8 is the sectional view of Fig. 1 middle cross beam;
Accompanying drawing 9 is a herringbone extension ladder stereogram in the embodiment of the invention 2;
Accompanying drawing 10 is the stereogram of Fig. 9 after shrinking;
Accompanying drawing 11 is the C-C sectional drawing (not showing security bar) among Fig. 9;
Accompanying drawing 12 is the stereogram of security bar among Fig. 9;
Accompanying drawing 13 is a B place partial enlarged drawing among Fig. 9.
The specific embodiment
Embodiment 1:
Shown in accompanying drawing 1 to 8, present embodiment is a word extension ladder, comprise respectively and save upright cleat stanchion 1 in a left side and the right upright cleat stanchion 2 that the nestable telescoping tube of slippage is step by step formed by 6, connect into a section of ladder by linkage 3 with corresponding crossbeam 4 between the telescoping tube 21 outside left side outer telescoping tube 11, the right side, also connect into another section of ladder by linkage 13 with corresponding crossbeam 14 between the telescoping tube 22 in the telescoping tube 12, right side in the left side, the rest may be inferred.Be provided with the locking device 5 that locks left and right sides adjacent expansion pipe simultaneously at the center of crossbeam 4.Crossbeam 4 is equipped with left securing rod 51, right securing rod 52 and spring 53 for the center has the I-shaped pipe (as shown in Figure 8) of cornical 41 in the cornical 41 of crossbeam 4, the opposite end of left securing rod 51, right securing rod 52 links together by spring 53.On the nestable mutually outer telescoping tube 11 in left side, interior telescoping tube 12, be respectively equipped with locating hole 111,121, after extension ladder stretches, locating hole 111,121 is overlapped, and left securing rod 51 free ends insert locating hole 111,121, locks the installation site of outer telescoping tube 11, interior telescoping tube 12; Nestable mutually outer telescoping tube 21, the interior telescoping tube 22 in same extension ladder right side locked by right securing rod 52 by same mode.The end that left and right securing rod 51,52 is connected with spring 53, be connected with a L shaped joystick 54,55 (operation for convenience by screw separately, can all connect joystick in the forward and backward both sides of crossbeam 4, as shown in Figure 2), on cornical 41 walls of crossbeam 4, be provided with elongated hole 44,45 (as shown in Figure 11), be connected with right securing rod 52 with left securing rod 51 so that joystick 54,55 passes the cornical wall respectively, elongated hole 44,45 defines track and the distance that joystick 54,55 moves simultaneously.
Because the free end of left and right securing rod 51,52 inserts the telescoping tube of locking both sides in the corresponding locating hole simultaneously under the effect of same spring 53, and spring 53 and the joystick 54,55 of controlling left and right securing rod 51,52 all are arranged on the center of crossbeam, so when extension ladder shrinks, can handle two joysticks 54,55 simultaneously by one hand, thereby control left securing rod 51 and right securing rod 52 simultaneously, telescopic ladder is shunk smoothly.
Present embodiment also improves on the basis of the above, is provided with movable security bar 57 between joystick 54,55, can not move under unexpected situation to guarantee joystick 54,55.One end of security bar 57 is hinged on by pin on the joystick 55 of a side, and the free end overhead is on the joystick 54 of an opposite side (as shown in Figure 4).When needs shrink extension ladder,, stir joystick 54,55 to crossbeam 4 centers simultaneously then and get final product earlier with security bar sideway swivel outside crossbeam 4.Wherein the shape of security bar 57 is not limited to the shape that is adopted in the accompanying drawing 5.The setting of this security bar 57 both can have been avoided mistake to stir joystick 54,55 and cause the extension ladder contraction to meet accident, and also can prevent to cause under spring 53 failure conditions simultaneously extension ladder to shrink and meet accident.
Present embodiment has also carried out the improvement of another aspect.Be provided with block rubber 8 between telescoping tube 11 and the interior telescoping tube 12 nestable outside adjacent, block rubber 8 is provided with bayonet socket 81 and step 82, interior telescoping tube 12 lower ends and outer telescoping tube 11 upper ends are respectively equipped with to the stamping forming buckle 122,112 of inwall, the buckle 122 of interior telescoping tube 12 snaps in the bayonet socket 81 of block rubber 8, and buckle 122 fastenings of outer telescoping tube 11 are on the step 82 of block rubber 8.For the ease of buckle 122,112 punch formings, so that the cross section of interior telescoping tube 12, outer telescoping tube 11 is is dolioform, buckle 122,112 is arranged on two relative planes of interior telescoping tube 12, outer telescoping tube 11.
Connect linkage 3 one ends and crossbeam 4 sockets of crossbeam 4 and outer telescoping tube 11, and fix by trip bolt; The other end is the interior shape size opening folder 31 consistent with outer telescoping tube 11 cross sections, inboard at opening folder 31 is provided with positioning round table 32 (as shown in Figure 2), the position of telescoping tube 11 top correspondences is provided with circular hole 113 outside the left side, round platform 32 is cooperated with circular hole 113, the both sides of opening be by tightly can linking into an integrated entity crossbeam 4 and outer telescoping tube 11 with screw, all the other crossbeams and telescoping tube be connected that also the rest may be inferred.The weight major part that stands on the crossbeam 4 of user is transferred to outside the corresponding left side outside the telescoping tube 11 and right side on the telescoping tube 21 by linkage 3 like this, and can all not be supported on the left and right securing rod 51,52, make the extension ladder bulk life time longer, more durable.
Embodiment 2:
Present embodiment is the herringbone extension ladder, and shown in accompanying drawing 9 to 13, its basic structure is identical with embodiment 1, and difference is the structure difference at security bar 57.An end of security bar 57 is hinged on the bottom of joystick 55 under the ladder user mode, and the free end overhead makes locking device 5 be in the lock state in the side of joystick 54.Be provided with the draw-in groove 58 that can be interlocked with joystick 54 at the middle part of security bar 57, this draw-in groove 58 should satisfy when draw-in groove 58 is fastened on the joystick 54 in the position on the security bar 57, and spring 53 is compressed, and locking device 5 is in the state that unlocks.The user is when drawing each section of ladder of extension ladder in like this, can be by stirring the joystick of each section of ladder, and the joystick that makes a side is fastened in the draw-in groove of security bar, to remove the locking between each section of ladder of extension ladder, and keep this state that unlocks, and then disposable extension ladder is shunk by draw-in groove.Particularly be applied on the double ladder, because double ladder is made up of the yi shaped ladder of two symmetries, therefore adopt above-mentioned security bar 57, can remove the locking between the section of ladder of the left side earlier, and by this state that unlocks of draw-in groove 58 maintenances, and then the locking between the corresponding section of ladder on the right of removing, and by this state that unlocks of draw-in groove maintenance, the last section of ladder that shrinks the right and left simultaneously, thus great convenience brought to the user.
Claims (9)
1. extension ladder, comprise by some joints step by step the nestable telescoping tube of slippage form about upright cleat stanchion (1,2), the upright cleat stanchion (1) in a left side and right upright cleat stanchion (2) connect into some section of ladders by linkage (3) and corresponding crossbeam (4), it is characterized in that: the locking device (5) that is provided with adjacent inside and outside telescoping tube (12,11) the adjacent inside and outside telescoping tube with the right side in installation site (22,21) installation site on the left of locking simultaneously in the middle part of the described crossbeam (4).
2. extension ladder according to claim 1, it is characterized in that: described locking device (5) comprises the left and right securing rod (51,52) that is provided with along crossbeam (4) length direction and is located at spring (53) in the middle part of the crossbeam (4), the opposite end of left and right securing rod (51,52) is respectively equipped with joystick (54,55), and by spring (53) connection, stretch back and the corresponding position of left and right securing rod free end at nestable adjacent expansion pipe, be provided with overlapped locating hole, the free end of left and right securing rod inserts under the effect of spring in the corresponding locating hole.
3. extension ladder according to claim 2, it is characterized in that: described crossbeam (4) has the I-shaped pipe of cornical (41) for the middle part, left and right securing rod (51,52) and spring (53) are installed in the cornical (41), are provided with to be convenient to corresponding joystick (54,55) and to stretch out strip hole (44,45) with translation on the tube wall of cornical (41).
4. extension ladder according to claim 3 is characterized in that: the cross section of described cornical (41) is dolioform.
5. according to each described extension ladder of claim 1 to 4, it is characterized in that: be provided with movable security bar (57) between the described joystick (54,55), one end of security bar (57) is hinged on the joystick (55) of a side, and the free end overhead is on the joystick (54) of an opposite side.
6. extension ladder according to claim 5 is characterized in that: described security bar (57) is provided with the draw-in groove (58) that an opposite side joystick (54) with hinged end is interlocked.
7. extension ladder according to claim 5 is characterized in that: the cross section of described telescoping tube is dolioform; Nestable adjacent inside and outside telescoping tube is provided with block rubber (8) between (12,11), block rubber (8) is provided with bayonet socket (81) and step (82), interior telescoping tube (12) lower end and outer telescoping tube (11) upper end are respectively equipped with to the stamping forming buckle of inwall (122,112), the buckle (122) of interior telescoping tube (12) snaps in the bayonet socket (81) of block rubber (8), and buckle (112) fastening of outer telescoping tube (11) is on the step (82) of block rubber (8).
8. extension ladder according to claim 7, it is characterized in that: an end of described linkage (3) is fixedlyed connected with crossbeam (4), the other end is the interior shape size opening folder (31) consistent with outer telescoping tube (11) cross section, opening folder (31) is stuck on the outer telescoping tube (11), and the both sides of its opening are fixedly connected by securing member.
9. extension ladder according to claim 5 is characterized in that: described extension ladder is a word extension ladder or herringbone extension ladder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100276543A CN101294479B (en) | 2007-04-23 | 2007-04-23 | Telescopic ladder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100276543A CN101294479B (en) | 2007-04-23 | 2007-04-23 | Telescopic ladder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101294479A true CN101294479A (en) | 2008-10-29 |
| CN101294479B CN101294479B (en) | 2011-11-09 |
Family
ID=40064984
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007100276543A Expired - Fee Related CN101294479B (en) | 2007-04-23 | 2007-04-23 | Telescopic ladder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101294479B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103277034A (en) * | 2013-05-06 | 2013-09-04 | 浙江迈尔工具有限公司 | Telescopic bamboo joint ladder |
| CN104806160A (en) * | 2015-02-27 | 2015-07-29 | 徐浩钟 | Special ladder for pruning in garden |
| CN109267927A (en) * | 2018-09-13 | 2019-01-25 | 滁州金诚金属制品有限公司 | A kind of pedal lift convenient for adjusting |
| US20190119985A1 (en) * | 2016-04-04 | 2019-04-25 | Telesteps Ab | An improved ladder tube for a collapsible ladder |
| SE541246C2 (en) * | 2016-04-04 | 2019-05-14 | Telesteps Ab | A rung for a collapsible ladder and ladders including such rungs |
| CN111155922A (en) * | 2019-04-08 | 2020-05-15 | 崇华科技永康有限公司 | Inner ladder section of extension ladder |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2033043U (en) * | 1988-01-02 | 1989-02-22 | 秦道华 | Extension ladder |
| CN2268119Y (en) * | 1996-11-19 | 1997-11-19 | 郭劭民 | Telescopic ladder |
| CN2571986Y (en) * | 2002-09-25 | 2003-09-10 | 王国华 | Telescopic ladder |
| EP1728966B1 (en) * | 2005-06-01 | 2007-12-19 | Telesteps AB | Collapsible ladder with locking mechanism |
| CN201047247Y (en) * | 2007-04-23 | 2008-04-16 | 简世坤 | Telescopic ladder |
-
2007
- 2007-04-23 CN CN2007100276543A patent/CN101294479B/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103277034A (en) * | 2013-05-06 | 2013-09-04 | 浙江迈尔工具有限公司 | Telescopic bamboo joint ladder |
| CN104806160A (en) * | 2015-02-27 | 2015-07-29 | 徐浩钟 | Special ladder for pruning in garden |
| CN104806160B (en) * | 2015-02-27 | 2016-08-17 | 黄宝生 | Prune gardens special-purpose ladder |
| US20190119985A1 (en) * | 2016-04-04 | 2019-04-25 | Telesteps Ab | An improved ladder tube for a collapsible ladder |
| SE541247C2 (en) * | 2016-04-04 | 2019-05-14 | Telesteps Ab | A ladder tube for a collapsible ladder and ladders including such tubes |
| SE541246C2 (en) * | 2016-04-04 | 2019-05-14 | Telesteps Ab | A rung for a collapsible ladder and ladders including such rungs |
| US10718161B2 (en) | 2016-04-04 | 2020-07-21 | Telesteps Ab | Rung for a collapsible ladder |
| US10961777B2 (en) | 2016-04-04 | 2021-03-30 | Telesteps Ab | Ladder tube for a collapsible ladder |
| CN109267927A (en) * | 2018-09-13 | 2019-01-25 | 滁州金诚金属制品有限公司 | A kind of pedal lift convenient for adjusting |
| CN109267927B (en) * | 2018-09-13 | 2020-10-13 | 滁州金诚金属制品有限公司 | Foot-operated elevator convenient to adjust |
| CN111155922A (en) * | 2019-04-08 | 2020-05-15 | 崇华科技永康有限公司 | Inner ladder section of extension ladder |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101294479B (en) | 2011-11-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20081029 Assignee: Yangjiang Shunhe Industry Co., Ltd. Assignor: Jian Shikun Contract record no.: 2014440000151 Denomination of invention: Telescopic ladder Granted publication date: 20111109 License type: Exclusive License Record date: 20140414 |
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| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180625 Address after: 529500 Tan Tan Zhou 325 National Road West of Yangjiang City, Guangdong Province Patentee after: Guangdong Shun Industrial Co. Ltd. Address before: 529500 Yangjiang 325 National Road, Guangdong Shun he Industrial Co., Ltd. Patentee before: Jian Shikun |
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| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111109 Termination date: 20200423 |
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| CF01 | Termination of patent right due to non-payment of annual fee |