CN201883928U - Locking structure for extension ladder - Google Patents
Locking structure for extension ladder Download PDFInfo
- Publication number
- CN201883928U CN201883928U CN 201020583019 CN201020583019U CN201883928U CN 201883928 U CN201883928 U CN 201883928U CN 201020583019 CN201020583019 CN 201020583019 CN 201020583019 U CN201020583019 U CN 201020583019U CN 201883928 U CN201883928 U CN 201883928U
- Authority
- CN
- China
- Prior art keywords
- latch
- adapter sleeve
- automatic unlocking
- unlocking switch
- extension ladder
- 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 - Lifetime
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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
Abstract
The utility model relates to a locking structure for an extension ladder, which comprises a connecting sleeve used for connecting section rods with corresponding crosspieces; a bolt is arranged in the connecting sleeve; the bolt is capable of making horizontal movement relative to the connecting sleeve; and a push button driving the bolt to make the horizontal movement is arranged in the connecting sleeve. The locking structure is characterized in that an automatic unlocking switch connected with the bolt is also arranged in the connecting sleeve; the automatic unlocking switch is rotatablely arranged in the connecting sleeve; the rotation of the automatic unlocking switch can drive the bolt to make the horizontal movement; the lower end face of the connecting sleeve is provided with a jack; the upper end face of the connecting sleeve is provided with an upwards convex push part; and the push part can be inserted into the jack of the connecting sleeve in the adjacent previous-stage locking structure to push the automatic unlocking switch to rotate. The utility model is the locking structure for the extension ladder, which not only can be unlocked by single section stage by stage but also can be used for automatically unlocking the adjacent previous-stage locking structure after the next-stage locking structure is unlocked.
Description
Technical field
The utility model relate to a kind of have somely can slide and mutually nested together the extension ladder of terraced bar particularly a kind of latch-up structure that is used for extension ladder relatively.
Background technology
When maintenance or maintenance task take place for dwelling house, apartment, farm, factory and other places, often need the use ladder.Ladder must be covered up obsolete the time somewhere.Long ladder can allow people arrive higher height, but but is not easy to carry and can takies more space in collection.And telescopic ladder just can extend ladder in use, and when collection ladder is folded up.
Patent documentation about extension ladder has much at present, have No. one for the U.S. Patent Publication of US7048094 a kind of safe extension ladder easy to use like this, this ladder comprises: the first terraced bar, the second terraced bar and extend in the first terraced bar and the second terraced bar between some crosspieces; The first terraced bar includes first pole and second pole, and this first pole includes an inner surface, and second pole connects into the stretching structure of a relative motion along its length by the nested mode and first pole; One locking mechanism is selectively tight with the relative first segment lever lock of second pole; One button is operatively coupled on the locking mechanism, is used to control this locking mechanism; This patent is characterised in that, described button is arranged on the position near first pole, and have one can with the suitable recess of thumb finger tip size, the thumb finger tip is placed in this recess and can promotes button and cancel the locking of locking mechanism to second pole along the direction from first pole toward second pole; One sleeve pipe is set on the external surface of second pole; This sleeve pipe has and the contacted outer spigot surface of the inner surface of first pole.Aforementioned extension ladder has the locking mechanism of a band push button.
As a patent No. is a kind of extension ladder latch-up structure with push button the Chinese utility model patent " extension ladder " of ZL200620141000.4 (notification number is CN200985735Y) has disclosed.
The shortcoming of aforementioned various extension ladders is that the button that must press one at a time on each crosspiece could be folded up ladder, and it is time-consuming that this just makes this ladder fold up.
The utility model content
But technical problem to be solved in the utility model be provide the release step by step of a kind of both single-units at above-mentioned prior art present situation, can realize can be with the latch-up structure that is used for extension ladder of adjacent higher level's latch-up structure automatic unlocking after subordinate's latch-up structure release.
The utility model solves the problems of the technologies described above the technical scheme that is adopted: a kind of latch-up structure that is used for extension ladder, comprise the adapter sleeve that is used to connect pole and corresponding crosspiece, be provided with latch in the adapter sleeve, this latch relatively the adapter sleeve horizontal cross move and can expose and will be adjacent two save rod lock together up and down, be provided with the spring that makes latch remain the trend of exposing in the described adapter sleeve, and laterally mobile the pushing away of driving latch turned round, it is characterized in that: also be provided with the automatic unlocking switch that links to each other with latch in the described adapter sleeve, collapse and touch when arriving to subordinate's adapter sleeve at extension ladder, described automatic unlocking switch is touched and is driven latch and laterally moves and release.
Above-mentioned automatic unlocking switch rotates and is arranged in the adapter sleeve, the rotation of automatic unlocking switch can drive latch and laterally move, the lower surface of described adapter sleeve has jack, the upper surface of adapter sleeve has the pushing part that raises up, and this pushing part can be inserted in the jack of adapter sleeve in adjacent higher level's latch-up structure and be promoted the automatic unlocking switch and rotate.The mode of rotating release is more steady, certainly the automatic unlocking switch also can adopt the mode that can move horizontally to be arranged in the adapter sleeve, pushing part automatic unlocking switch adopts the inclined-plane fit structure, collapse and touch when arriving to subordinate's adapter sleeve and make at extension ladder, the pushing part can promote the traversing and release of automatic unlocking switch.
Above-mentioned automatic unlocking switch is L-shaped, the automatic unlocking switch is made up of shaft, vertical portion and horizontal part three parts, described shaft constrains in the adapter sleeve and can rotate around self axis, the inner of the lower end of vertical portion and horizontal part all fixed with shaft, the upper end of vertical portion links to each other with described latch, the outer end of horizontal part extends to described jack position place, and described pushing part is inserted and promoted the outer end of horizontal part behind the jack of adapter sleeve in adjacent higher level's latch-up structure and the automatic unlocking switch is rotated.The automatic unlocking switch is arranged to L shapedly can the portion of being pushed drive and rotate final the drive under the prerequisite that latch moves satisfying the automatic unlocking switch, and its structure is the simplest.Certainly the automatic unlocking switch also can be designed to other profile, can drive latch and laterally moves as long as can satisfy the rotation of automatic unlocking switch.
There are two and parallel interval setting in the vertical portion of above-mentioned automatic unlocking switch, the lower end of vertical portion is connected with the middle part of shaft, described latch middle part has first cannelure, and the upper end of the vertical portion of described automatic unlocking switch is stuck in first cannelure and with the end face of first cannelure and touches; The horizontal part of described automatic unlocking switch has two and parallel interval setting, and the inner of horizontal part is connected with the two ends of shaft respectively, and the jack of adapter sleeve also has two.And the automatic unlocking switch is stuck in by the vertical portion on it and realizes in first cannelure being connected of automatic unlocking switch and latch, so assembling is also very convenient, two horizontal parts is set can guarantees that the pushing part can rotate by more steady promotion automatic unlocking switch.Certainly vertical portion and horizontal part also can have only one, only need to open a strip through-hole that axially is provided with on latch, the vertical portion is inserted in the strip through-hole, it is higher to the matching requirements between each parts, and this automatic unlocking construction of switch is too thin, can not smooth rotation.
The upper end of the vertical portion of above-mentioned automatic unlocking switch is circular-arc.The end face of the vertical portion and first cannelure is that cambered surface contacts, and can easily promote the horizontal slippage of latch like this when the automatic unlocking switch rotates.
The horizontal part outer end of above-mentioned automatic unlocking switch has two extensions downwards and inserts the salient point of corresponding jack.So better the pushing part on the adapter sleeve contacts with the automatic unlocking switch temperature, and makes automatic unlocking switch rotational angle bigger in identical moving range.
The inboard of above-mentioned adapter sleeve has the insertion section of pegging graft with crosspiece, has cavity in the insertion section, and described latch, automatic unlocking switch and spring are positioned at this cavity; The adapter sleeve outside has annular surface, and this annular surface forms the socket with the pole socket, has the through hole that connects and pass for latch with cavity on the socket wall.It is the conventional structure of adapter sleeve, can conveniently crosspiece and pole be connected on this adapter sleeve.
For ease of settling spring, be fixed with a spring base in the cavity of above-mentioned insertion section, has containing hole on the spring base, the rear portion of described latch then is positioned at the front portion of containing hole, described spring is positioned at the rear portion of containing hole, one end of spring is resisted against the rear portion of latch, and the other end of spring is resisted against on the back inwall of containing hole.
Above-mentioned spring base both sides have insert edge, correspondence, and both sides are provided with the slot that plugs for insert edge in the cavity.By the effect of insert edge and slot, can be conveniently that spring base is spacing in cavity.
The bar hole that has horizontally set on the front end face of the insertion section of above-mentioned adapter sleeve and communicate with described cavity, the latch middle part has second cannelure, described pushing away turned round outside the front end face that is positioned at the insertion section, push away and have the connecting portion that extends back on the rear end face of turning round, this connecting portion pass be buckled in behind the bar hole in described second cannelure and with the end face touching of second cannelure.This pushes away the connected mode of turning round by buckle and is connected with latch, has advantage easy for installation.
Compared with prior art, advantage of the present utility model is: when the release step by step of needs single-unit, then need higher level's latch-up structure from extension ladder step by step toward subordinate's release, only need promote during release to turn round, push away the moving latch lateral inward of twisted strip and move and just can remove the adjacent locking of two joint joint bars up and down of extension ladder; In the ban with after subordinate's latch-up structure release, its adjacent higher level's latch-up structure is together with crosspiece past moving down under the effect of deadweight, the pushing part of the adapter sleeve in subordinate's latch-up structure is inserted in the jack of adapter sleeve in adjacent higher level's latch-up structure and is promoted the automatic unlocking switch and rotate, the final latch lateral inward that drives moves this grade of releasing latch-up structure, by that analogy, it can automatically terminate higher level's latch-up structure step by step; Therefore this latch-up structure has the multifarious characteristics of release mode, and is therefore more convenient to operate.
Description of drawings
Fig. 1 is the perspective view (lock-out state) of the utility model embodiment;
Fig. 2 is for pushing away the solid assembling schematic diagram of turning round with automatic unlocking switch and latch (lock-out state) among the utility model embodiment;
Fig. 3 is the three-dimensional exploded view of the utility model embodiment;
Fig. 4 is the sectional view (lock-out state) of the use of the utility model embodiment on extension ladder;
Fig. 5 is the perspective view one (released state) of the utility model embodiment;
Fig. 6 is the perspective view two (released state) of the utility model embodiment;
Fig. 7 is for pushing away the solid assembling schematic diagram of turning round with automatic unlocking switch and latch (released state) among the utility model embodiment;
The sectional view (released state) that Fig. 8 uses on extension ladder for the utility model embodiment;
The schematic perspective view (released state) that Fig. 9 uses on extension ladder for the utility model embodiment.
The specific embodiment
Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.
Shown in Fig. 1～9, be a preferred embodiment of the present utility model.
A kind of latch-up structure that is used for extension ladder comprises the adapter sleeve 3 that is used to connect pole 1 and corresponding crosspiece 2,
The inboard of adapter sleeve 3 has the insertion section 33 of pegging graft with crosspiece 2, has cavity 331 in the insertion section 33, the lower ending opening of this cavity 331, be convenient to each parts is installed in the cavity 331, crosspiece 2 and fixing with crosspiece 2 is inserted in insertion section 33, and the lower ending opening of cavity 331 is covered in the lower surface of crosspiece 2; Adapter sleeve 3 outsides have annular surface, and this annular surface forms the socket 34 with pole 1 socket, this socket 34 and pole 1 upper periphery close-fitting, and can be by screw that socket 34 is fixing with pole 1.
The inner cavity 331 of adapter sleeve 3 is provided with latch 4, latch 4 middle parts have first cannelure 41, this latch 4 relatively adapter sleeve 3 horizontal cross move and can expose and will be adjacent two save bars 1 and lock together up and down, be provided with the spring 5 that makes latch 4 remain the trend of exposing in the adapter sleeve 3, has the through hole 341 that connects and pass with cavity 331 on socket 34 walls for latch 4, have lockhole 11 on pole 1 wall that fixes with adapter sleeve 3, a last joint joint bar 1 middle part that is plugged in aforementioned pole 1 also is provided with a lockhole 12, after passing adapter sleeve 3, latch 4 enters the lockhole 11 of two poles 1 successively, in 12, with this two joints joint bar, 1 locking.It is the conventional design of the latch-up structure of existing extension ladder.
One drives laterally mobile the pushing away of latch 4 turns round 6, push away and turn round 6 and be positioned at outside the front end face of insertion section 33, push away to turn round on 6 the rear end face and have the connecting portion 61 that extends back, the bar hole 333 that has horizontally set on the front end face of the insertion section 33 of adapter sleeve and communicate with cavity 3, certainly, because insertion section 33 is plugged in the crosspiece 2, therefore also have and aforementioned bar hole 333 corresponding bar holes on the sidewall of crosspiece 2, have second cannelure 42 at latch 4 middle parts, push away turn round 6 connecting portion 61 pass successively be buckled in behind bar hole on the crosspiece 2 and the bar hole on the insertion section 333 in second cannelure 42 and with the end face touching of second cannelure 42.
Also be provided with the automatic unlocking switch 7 that links to each other with latch 4 in the cavity 331 of adapter sleeve 3, automatic unlocking switch 7 is L-shaped, automatic unlocking switch 7 is made up of shaft 71, vertical portion 72 and horizontal part 73 3 parts, the part that is formed in one of the automatic unlocking switch 7 in the present embodiment.Automatic unlocking switch 7 rotates by shaft 71 and is arranged in the adapter sleeve 3, and shaft 71 constrains in the adapter sleeve 3 and can rotate around self axis, and the rotation of automatic unlocking switch 7 can drive latch 4 and laterally move; There are two and parallel interval setting in the vertical portion 72 of automatic unlocking switch, the lower end of vertical portion 72 is connected with the middle part of shaft 71, the upper end of the vertical portion 72 of automatic unlocking switch is stuck in first cannelure 41 and with the end face of first cannelure 41 and touches, and the upper end of vertical portion 72 is circular-arc; The horizontal part 73 of automatic unlocking switch has two and parallel interval setting, the inner of horizontal part 72 is connected with the two ends of shaft 71 respectively, the lower surface of adapter sleeve 3 has two jacks 31, the outer end of horizontal part 73 extends to jack 31 positions, and horizontal part 73 outer ends have the salient point 731 of two extensions downwards and insertion corresponding jack 31.
The upper surface of adapter sleeve 3 has two pushing parts that raise up 32, and 32 jack 31 backs of inserting adapter sleeve in adjacent higher level's latch-up structure promote the outer end of horizontal part 73 and automatic unlocking switch 7 is rotated in the pushing part.
The operating principle and the process of this latch-up structure are as follows.
Shown in Fig. 1～4, during locking, move on the last joint joint bar 1, when moving to correct position, be that lock hole 11,12 is positioned on the same axis on the adjacent two joint joint bars 1, latch 4 ejects under the effect of spring 5, inserts simultaneously in the lockhole 11,12 of this two joints joint bar 1, and this two joints joint bar 1 is locked together.
Shown in Fig. 5～9, when the release step by step of needs single-unit, then need higher level's latch-up structure past subordinate release step by step from extension ladder, only need promote to turn round 6 during release, push away and turn round 6 and drive the elastic force lateral inward that latches 4 overcome spring 5 and move, latch 4 withdraws from the lockhole 11,12 of two joint joint bars 1, removes the adjacent locking of two joint joint bars 1 up and down of extension ladder, and a last joint joint bar 1 moves down under the effect of gravity.
Shown in Fig. 5～9, automatically terminate higher level's latch-up structure step by step, promote earlier to ox with subordinate's latch-up structure release after, its adjacent higher level's latch-up structure is together with crosspiece 2 past moving down under the effect of deadweight, insert in the jack 31 of adapter sleeve in adjacent higher level's latch-up structure and the salient point 731 of promotion horizontal part 73 pushing part 32 of the adapter sleeve in subordinate's latch-up structure, automatic unlocking switch 7 rotates, final latch 4 lateral inward that drive move this grade of releasing latch-up structure, by that analogy, it can remove higher level's latch-up structure step by step.
Claims (10)
1. latch-up structure that is used for extension ladder, comprise the adapter sleeve (3) that is used to connect pole (1) and corresponding crosspiece (2), be provided with latch (4) in the adapter sleeve (3), this latch (4) relatively adapter sleeve (3) horizontal cross move and can expose and will be adjacent two save bars (1) and lock together up and down, be provided with the spring (5) that makes latch (4) remain the trend of exposing in the described adapter sleeve (3), and (6) are turned round in laterally mobile the pushing away of driving latch (4), it is characterized in that: also be provided with the automatic unlocking switch (7) that links to each other with latch (4) in the described adapter sleeve (3), collapse and touch when arriving to subordinate's adapter sleeve (3) at extension ladder, described automatic unlocking switch (7) is touched and is driven latch (4) and laterally moves and release.
2. the latch-up structure that is used for extension ladder according to claim 1, it is characterized in that: described automatic unlocking switch (7) rotates and is arranged in the adapter sleeve (3), the rotation of automatic unlocking switch (7) can drive latch (4) and laterally move, the lower surface of described adapter sleeve (3) has jack (31), the upper surface of adapter sleeve (3) has the pushing part (32) that raises up, and this pushing part (32) can insert in the jack (31) of adapter sleeve in adjacent higher level's latch-up structure and promote automatic unlocking switch (7) and rotate.
3. the latch-up structure that is used for extension ladder according to claim 2, it is characterized in that: described automatic unlocking switch (7) is L-shaped, automatic unlocking switch (7) is by shaft (71), vertical portion (72) and horizontal part (73) three parts are formed, described shaft (71) constrains in the adapter sleeve (3) and can rotate around self axis, the inner of the lower end of vertical portion (72) and horizontal part (73) all fixed with shaft (71), the upper end of vertical portion (72) links to each other with described latch (4), the outer end of horizontal part (73) extends to described jack (31) position, and jack (31) back that described pushing part (32) insert adapter sleeve in adjacent higher level's latch-up structure promotes the outer end of horizontal part (73) and automatic unlocking switch (7) is rotated.
4. the latch-up structure that is used for extension ladder according to claim 3, it is characterized in that: the vertical portion of described automatic unlocking switch (72) have two and parallel interval setting, the lower end of vertical portion (72) is connected with the middle part of shaft (71), described latch (4) middle part has first cannelure (41), and the upper end of the vertical portion of described automatic unlocking switch (72) is stuck in first cannelure (41) and with the end face of first cannelure (41) and touches; The horizontal part of described automatic unlocking switch (73) has two and parallel interval setting, and the inner of horizontal part (72) is connected with the two ends of shaft (71) respectively, and the jack of described adapter sleeve (31) has two.
5. the latch-up structure that is used for extension ladder according to claim 4 is characterized in that: the upper end of the vertical portion of described automatic unlocking switch (72) is circular-arc.
6. the latch-up structure that is used for extension ladder according to claim 4 is characterized in that: the horizontal part of described automatic unlocking switch (73) outer end has two extensions downwards and inserts the salient point (731) of corresponding jack (31).
7. according to the described latch-up structure that is used for extension ladder of arbitrary claim in the claim 1～6, it is characterized in that: the inboard of described adapter sleeve (3) has the insertion section (33) of pegging graft with crosspiece (2), have cavity (331) in the insertion section (33), described latch (4), automatic unlocking switch (7) and spring (5) are positioned at this cavity (331); Adapter sleeve (3) outside has annular surface, and this annular surface forms the socket (34) with pole (1) socket, has the through hole (341) that connects and pass for latch (4) with cavity (331) on socket (34) wall.
8. the latch-up structure that is used for extension ladder according to claim 7, it is characterized in that: also be fixed with a spring base (8) in the cavity of described insertion section (331), has containing hole (81) on the spring base (8), the rear portion of described latch (4) then is positioned at the front portion of containing hole (81), described spring (5) is positioned at the rear portion of containing hole (81), one end of spring (5) is resisted against the rear portion of latch (4), and the other end of spring (5) is resisted against on the back inwall of containing hole (81).
9. the latch-up structure that is used for extension ladder according to claim 8 is characterized in that: described spring base (8) both sides have insert edge (82), correspondence, and the interior both sides of cavity (331) are provided with the slot (332) that plugs for insert edge.
10. the latch-up structure that is used for extension ladder according to claim 7, it is characterized in that: the bar hole (333) that has horizontally set on the front end face of the insertion section of described adapter sleeve (33) and communicate with described cavity (3), latch (4) middle part has second cannelure (42), described pushing away turned round outside the front end face that (6) be positioned at insertion section (33), push away and have the connecting portion (61) that extends back on the rear end face of turning round (6), this connecting portion (61) pass be buckled in behind the bar hole (333) in described second cannelure (42) and with the end face touching of second cannelure (42).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020583019 CN201883928U (en) | 2010-10-28 | 2010-10-28 | Locking structure for extension ladder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020583019 CN201883928U (en) | 2010-10-28 | 2010-10-28 | Locking structure for extension ladder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201883928U true CN201883928U (en) | 2011-06-29 |
Family
ID=44181468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201020583019 Expired - Lifetime CN201883928U (en) | 2010-10-28 | 2010-10-28 | Locking structure for extension ladder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201883928U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102003136A (en) * | 2010-10-28 | 2011-04-06 | 王万兴 | Locking structure for telescopic ladder |
-
2010
- 2010-10-28 CN CN 201020583019 patent/CN201883928U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102003136A (en) * | 2010-10-28 | 2011-04-06 | 王万兴 | Locking structure for telescopic ladder |
| WO2012055159A1 (en) * | 2010-10-28 | 2012-05-03 | 宁波兴富工具有限公司 | Locking structure for extensionableladder |
| CN102003136B (en) * | 2010-10-28 | 2012-09-12 | 王万兴 | Locking structure for telescopic ladder |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110629 Effective date of abandoning: 20120912 |