CN102278059B - Extension ladder with finger-protected device - Google Patents
Extension ladder with finger-protected device Download PDFInfo
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- CN102278059B CN102278059B CN 201110193199 CN201110193199A CN102278059B CN 102278059 B CN102278059 B CN 102278059B CN 201110193199 CN201110193199 CN 201110193199 CN 201110193199 A CN201110193199 A CN 201110193199A CN 102278059 B CN102278059 B CN 102278059B
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- China
- Prior art keywords
- latch
- adapter sleeve
- extension ladder
- automatic unlocking
- unlocking switch
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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 relates to an extension ladder with a finger-protected device. The extension ladder comprises section bars and crosspieces, wherein the section bars and the corresponding crosspieces are connected by connecting sleeves; an inserted pin and a push knob are arranged in each of the connecting sleeves. The extension ladder is characterized in that: automatic unlocking switches are also arranged in each of the connecting sleeves; pushing pieces are fixed to the upper end faces of the connecting sleeves, and blocking pieces are fixed to the lower end faces of the connecting sleeves; the blocking pieces are provided with two blocking walls which extend downwards and are arranged at intervals; the automatic unlocking switches are positioned between the two blocking walls; inner lateral surfaces of the pushing pieces and the blocking walls are inclined planes which incline outwards from bottom to top. The connecting sleeves of upper and lower stages are supported by the blocking walls and the pushing piece, and a safety interval is formed between the upper and lower adjacent crosspieces; and fingers on the section bars can be pushed away inwards by the inclined planes of the pushing pieces and the blocking walls in the process of moving downwards, so that the fingers are positioned within the safety intervals between the upper and lower crosspieces to prevent the fingers from being pinched.
Description
Technical field
But the present invention relates to a kind of have some relative slidings and mutually nested together the extension ladder of terraced bar, particularly a kind of extension ladder with finger pinch device.
Background technology
Patent documentation about extension ladder has much at present, have and disclose a kind of safe extension ladder easy to use like this for the United States Patent (USP) of US7048094 No. one, this ladder comprises: the first terraced bar, the second terraced bar and be arranged on the first terraced bar and the second terraced bar between some crosspieces; The first terraced bar includes the first pole and the second pole, and this first pole includes an inner surface, and the second pole connects into the stretching structure of a relative motion along its length by nested mode and the first pole; One locking mechanism is selectively with the second relative first segment rod locking of pole; One button is operatively coupled on locking mechanism, is used for controlling this locking mechanism; This patent is characterised in that, described button is arranged on the position near the 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 locking mechanism to the locking of the second pole along the direction from the first pole toward the second pole; One sleeve pipe is set on the external surface of the second pole; This sleeve pipe has and the contacted outer spigot surface of the inner surface of the first pole.Telescopic ladder can extend ladder in use, and when collection, ladder is folded up.
A kind of extension ladder of conventional structure as the patent No. Chinese utility model patent " extension ladder " that is ZL200620141000.4 (notification number is CN200985735Y) has disclosed.
Existing extension ladder can collide and contact after two adjacent crosspieces are collapsed when shrinking, and safe space namely is not set after taking between adjacent crossbars, if at this moment finger is just in time between two cross bars, will pressure touch point injury.The button that must press one at a time on each crosspiece when shrinking of existing extension ladder could fold ladder fully in addition, and it is time-consuming that this just makes this ladder fold up.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of extension ladder with finger pinch device for above-mentioned prior art present situation, this extension ladder is safer in use, but not only single-unit release step by step in addition, but also can realize can be with adjacent higher level's latch-up structure automatic unlocking after subordinate's latch-up structure release.
The present invention solves the problems of the technologies described above the technical scheme that adopts: a kind of extension ladder with finger pinch device, include two relatively vertical terraced bars that arrange, and many crosspieces that are arranged between this two terraced bar, each terraced bar is comprised of the socket of more piece pole telescopically, and described pole and corresponding crosspiece link together by adapter sleeve; Be provided with latch in adapter sleeve, this latch relatively the adapter sleeve horizontal cross move and can expose and two joint joint rod lock up and down that will be adjacent together, be provided with the spring that makes latch remain the trend of exposing in described adapter sleeve, reach pushing away of driving latch transverse shifting to turn round; It is characterized in that: also be provided with the automatic unlocking switch that is connected with latch in described adapter sleeve, the upper surface of adapter sleeve is fixed with the impeller that raises up, the lower surface of adapter sleeve is fixed with block piece, block piece has two retaining walls to downward-extension and interval setting, described automatic unlocking switch is between two retaining walls, collapse and touch when arriving to subordinate's adapter sleeve at extension ladder, the impeller that the automatic unlocking switch is inserted between two retaining walls directly or indirectly touches and drives the latch transverse shifting and release; The medial surface of described impeller is outward-dipping from bottom to top inclined-plane, and the retaining wall medial surface of described block piece is outward-dipping from top to bottom inclined-plane.
The lower end of the retaining wall of above-mentioned block piece has the stuck point of outside projection, has the hole that snaps in for described stuck point on described corresponding pole, being hidden in the hole bottom of described retaining wall.Card by stuck point and hole is joined, make the tightr of block piece and pole applying, retaining wall is hidden in the hole bottom in addition, the lower end of retaining wall just can not expose outside pole like this, can be not gapped between the lower end of retaining wall and pole side face, prevent that retaining wall clips to finger in the folding process of higher level's crosspiece, use safer.
The bottom of above-mentioned impeller has to downward-extension and two joint pins that arrange along the interval, front and back, have on described adapter sleeve and vertically run through the jack that passes for two joint pins, the top of described block piece has along front and back connecting wall is set, and described connecting wall is threaded by the lower surface of screw with described two joint pins.By being connected of joint pin and connecting wall, well impeller and block piece and adapter sleeve are fixed together.
The connecting wall of above-mentioned block piece is provided with the transition pushing block that the relative connecting wall of energy moves up and down, move on this transition pushing block and can touch the automatic unlocking switch, collapse and touch when arriving to subordinate's adapter sleeve at extension ladder, described impeller can contact with the transition pushing block and drive on the transition pushing block and move.So better the impeller on adapter sleeve contacts with the automatic unlocking switch ahead of time, makes automatic unlocking switch rotational angle larger in identical moving range, and the height of impeller also can suitably reduce simultaneously.
Above-mentioned automatic unlocking switch rotates and is arranged in adapter sleeve, and the rotational of automatic unlocking switch drives the latch transverse shifting, and described impeller can insert in adjacent higher level's adapter sleeve and the rotation of promotion automatic unlocking switch.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 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 comprised of shaft, vertical portion and horizontal part three parts, described shaft constrains in 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 is connected with described latch, the outer end of horizontal part exposes outside adapter sleeve downwards, and described impeller inserts and promotes the outer end of horizontal part after adjacent higher level's adapter sleeve and the automatic unlocking switch is rotated.The automatic unlocking switch is arranged to L shapedly can the section 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, drives the latch transverse shifting as long as can satisfy the rotational of automatic unlocking switch.
Above-mentioned latch middle part has the first cannelure, and the upper end of described vertical portion is circular-arc and has draw-in groove, and this draw-in groove is stuck in the first cannelure and with the end face of the first cannelure and touches.And the automatic unlocking switch is stuck in by the vertical portion on it and realizes in the first cannelure being connected of automatic unlocking switch and latch, therefore assembling is also very convenient.The end face of vertical portion and the first cannelure is that cambered surface contacts, and can easily promote the latch horizontal sliding like this when the automatic unlocking switch rotates.
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, also be fixed with a spring base in the cavity of above-mentioned insertion section, has containing hole on spring base, the rear portion of described latch 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 rear inwall of containing hole.
The bar hole that has horizontally set on the front end face of above-mentioned insertion section and communicate with described cavity, the latch middle part has the 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 after bar hole in described the second cannelure and with the end face touching of the second cannelure.This pushes away the connected mode of turning round by buckle and is connected with latch, has advantages of easy for installation.
Compared with prior art, the invention has the advantages that: due to the support by retaining wall and impeller between the two-stage adapter sleeve of up and down, form safe spacing between two crosspieces of adjacent up and down, the automatic unlocking switch is hidden between the retaining wall of block piece, impeller is completed with contacting between retaining wall of automatic unlocking switch, therefore when higher level's crosspiece was displaced downwardly to subordinate's crosspiece together with adapter sleeve, finger can not be sandwiched between impeller and automatic unlocking switch; And the inner face of impeller and retaining wall is the inclined-plane, and in folding process, the inclined-plane can inwardly be pushed the finger that is held on pole open, makes in the safe spacing of finger between two crosspieces of up and down, effectively prevents tong; When the release step by step of needs single-unit, need higher level's crosspiece 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 the locking that just can remove extension ladder adjacent up and down two joint joint bars; In the ban with after subordinate's latch-up structure release, its adjacent higher level's adapter sleeve is together with crosspiece past moving down under the effect of deadweight, promote the automatic unlocking switch rotates until the impeller on the adapter sleeve in subordinate's crosspiece directly or indirectly contacts with the automatic unlocking switch, 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 unlocking manner, and is therefore more convenient to operate.
Description of drawings
Fig. 1 is the perspective view (contraction state) of the embodiment of the present invention;
Fig. 2 is the sectional view (released state) of latch-up structure in the embodiment of the present invention;
Fig. 3 is that the A-A of Fig. 2 is to sectional view;
Fig. 4 is the sectional view (lock-out state) of latch-up structure in the embodiment of the present invention;
Fig. 5 pushes away in the embodiment of the present invention to turn round with automatic unlocking switch and latch to be arranged on perspective view on adapter sleeve;
Fig. 6 is the three-dimensional exploded view of latch-up structure in the embodiment of the present invention;
Fig. 7 pushes away the solid assembling schematic diagram of turning round with automatic unlocking switch and latch in the embodiment of the present invention;
Fig. 8 is the perspective view that the embodiment of the present invention automatically terminates step by step.
The specific embodiment
Embodiment is described in further detail the present invention below in conjunction with accompanying drawing.
As shown in Fig. 1～8, be a preferred embodiment of the present invention.
A kind of extension ladder with finger pinch device, include two relatively vertical terraced bars that arrange, and the many crosspieces 2 that are arranged between this two terraced bar, each terraced bar is comprised of the 1 telescopically socket of more piece pole, and pole 1 and corresponding crosspiece 2 link together by adapter sleeve 3.
The inboard of adapter sleeve 3 has the insertion section 32 of pegging graft with crosspiece 2, has cavity 321 in insertion section 32, the lower ending opening of this cavity 321, be convenient to each parts are installed in cavity 321, crosspiece 2 and fixing with crosspiece 2 is inserted in insertion section 32, and the lower ending opening of cavity 321 is covered in the lower surface of crosspiece 2; Adapter sleeve 3 outsides have annular surface, and this annular surface forms the socket 33 with pole 1 socket, this socket 33 and pole 1 upper periphery close-fitting, and can be by screw, that socket 33 is fixing with pole 1.
be provided with latch 4 in the cavity 321 of adapter sleeve 3, latch 4 middle parts have the 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 adapter sleeve 3, has the through hole 331 that connects and pass for latch 4 with cavity 321 on socket 33 walls, have lockhole 14 on pole 1 wall that fixes with adapter sleeve 3, upper joint joint bar 1 middle part that is plugged in aforementioned pole 1 also is provided with a lockhole 15, pass the lockhole 14 that enters successively adjacent two poles 1 after the through hole 331 of adapter sleeve 3 when latch 4, in 15, with this two joints joint bar, 1 locking.It is the conventional design of the latch-up structure of existing extension ladder.
one drives pushing away of latch 4 transverse shiftings turns round 6, push away and turn round 6 and be positioned at outside the front end face of insertion section 32, push away to turn round on 6 rear end face and have the connecting portion 61 that extends back, the bar hole 322 that has horizontally set on the front end face of the insertion section 32 of adapter sleeve and communicate with cavity 321, certainly, because insertion section 32 is plugged in crosspiece 2, therefore also have and the corresponding bar hole of aforementioned bar hole 322 on the sidewall of crosspiece 2, has the second cannelure 42 at latch 4 middle parts, push away turn round 6 connecting portion 61 pass successively be buckled in after bar hole on crosspiece 2 and the bar hole on the insertion section 322 in the second cannelure 42 and with the end face touching of the second cannelure 42.
Also be provided with the automatic unlocking switch 7 that is connected with latch 4 in the cavity 321 of adapter sleeve 3, automatic unlocking switch 7 is L-shaped, automatic unlocking switch 7 is comprised 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 adapter sleeve 3, and shaft 71 constrains in adapter sleeve 3 and can rotate around self axis, and the rotational of automatic unlocking switch 7 drives latch 4 transverse shiftings; The inner of the lower end of vertical portion 72 and horizontal part 73 all fixed with the middle part of shaft 71; The upper end of vertical portion 72 is circular-arc and has draw-in groove 721, and this draw-in groove 721 is stuck in the first cannelure 41 and with the end face of the first cannelure 41 and touches; The outer end of horizontal part 73 exposes outside adapter sleeve 3 downwards,
The upper surface of adapter sleeve 3 is fixed with the impeller 8 that raises up, the lower surface of adapter sleeve 3 is fixed with block piece 9, block piece 9 has two to downward-extension and the retaining wall 91 that arranges along the interval, front and back, the lower end of the retaining wall 91 of each block piece all has the stuck point 93 of outside projection, have two holes 11 that snap in for stuck points 93 on corresponding pole 1, being hidden in bottom in hole 11 of retaining wall 91; The bottom of impeller 8 has to downward-extension and two joint pins 81 that arrange along the interval, front and back, have on adapter sleeve 3 and vertically run through the jack 31 that passes for two joint pins 81, the top of block piece 9 has connecting wall 94 is set along front and back, and connecting wall 94 is threaded by the lower surface of screw 13 with two joint pins 81; The connecting wall 94 of block piece is provided with the transition pushing block 10 that the relative connecting wall 94 of energy moves up and down, move on this transition pushing block 10 and can touch automatic unlocking switch 7, collapse and touch when arriving to subordinate's adapter sleeve 3 at extension ladder, impeller 8 can contact with transition pushing block 10 and drive and move on transition pushing block 10, move on transition pushing block 10 shake-up horizontal part 73 the outer end and automatic unlocking switch 7 is rotated, finally drive latch 4 and transfer from one place to another under escort lock in laterally.
The medial surface 81 of impeller 8 is outward-dipping from bottom to top inclined-plane, and the medial surface 92 of the retaining wall 91 of block piece is outward-dipping from top to bottom inclined-plane.
Operating principle and the process of this latch-up structure are as follows.
As shown in Figure 4, during locking, move on a upper joint joint bar 1, when moving to correct position, namely on adjacent two joint joint bars 1, lock hole 11,12 is positioned on same axis, and latch 4 ejects under the effect of spring 5, insert simultaneously in the lockhole 11,12 of this two joints joint bar 1, this two joints joint bar 1 is locked together.
As shown in Fig. 1～3,8, when the release step by step of needs single-unit, need the 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 locking of extension ladder adjacent up and down two joint joint bars 1, and a upper joint saves bar 1 and moves down under action of gravitation.
as Fig. 1～3, shown in 8, automatically terminate step by step higher level's latch-up structure, first push away turn round 6 latch-up structure releases with subordinate's crosspiece 2 after, its adjacent higher level's adapter sleeve 3 is together with crosspiece 2 past moving down under the effect of deadweight, until the impeller 8 in the latch-up structure of subordinate's crosspiece 2 inserts between the retaining wall 91 of block piece, promote to move on transition pushing block 10, move on transition pushing block 10 shake-up horizontal part 73 the outer end and automatic unlocking switch 7 is rotated, transfer from one place to another under escort the latch-up structure except this grade crosspiece 2 in final drive latch 4 is horizontal, by that analogy, it can remove the latch-up structure of higher level's crosspiece 2 step by step.
As shown in Figure 1, owing to passing through the support of retaining wall 91 and impeller 8 between the two-stage adapter sleeve of up and down, form safe spacing X between two crosspieces 2 of adjacent up and down, automatic unlocking switch 7 is hidden between two retaining walls 91 of block piece, impeller 8 is completed with contacting between retaining wall 91 of automatic unlocking switch 7, therefore when higher level's crosspiece 2 was displaced downwardly to subordinate's crosspiece 2 together with adapter sleeve 3, finger can not be sandwiched between impeller 8 and automatic unlocking switch 7; And the inner face 81,92 of impeller 8 and retaining wall 91 is the inclined-plane, and in folding process, the inclined-plane can inwardly be pushed the finger that is held on pole open, makes in the safe spacing of finger between two crosspieces of up and down, effectively prevents tong.
Claims (10)
1. extension ladder with finger pinch device, include two relatively vertical terraced bars that arrange, and many crosspieces (2) that are arranged between this two terraced bar, each terraced bar is comprised of the socket of more piece pole (1) telescopically, and described pole (1) and corresponding crosspiece (2) link together by adapter sleeve (3); Be provided with latch (4) in 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 described adapter sleeve (3), and pushing away of driving latch (4) transverse shifting turned round (6); it is characterized in that: also be provided with the automatic unlocking switch (7) that is connected with latch (4) in described adapter sleeve (3), the upper surface of adapter sleeve (3) is fixed with the impeller (8) that raises up, the lower surface of adapter sleeve (3) is fixed with block piece (9), block piece (9) has two retaining walls (91) to downward-extension and interval setting, collapse and touch when arriving to subordinate's adapter sleeve (3) at extension ladder, the impeller (8) that described automatic unlocking switch (7) is inserted between two retaining walls directly or indirectly touches and drives latch (4) transverse shifting and release, the medial surface (81) of described impeller (8) is outward-dipping from bottom to top inclined-plane, and the medial surface (92) of the retaining wall of described block piece (91) is outward-dipping from top to bottom inclined-plane.
2. the extension ladder with finger pinch device according to claim 1, it is characterized in that: the lower end of the retaining wall of described block piece (91) has the stuck point (93) of outside projection, have for the hole (11) that snaps in of described stuck point (93) being hidden in bottom in hole (11) of described retaining wall (91) on described corresponding pole (1).
3. the extension ladder with finger pinch device according to claim 1, it is characterized in that: the bottom of described impeller (8) has to downward-extension and two joint pins (81) that arrange along the interval, front and back, have on described adapter sleeve (3) and vertically run through the jack (31) that passes for two joint pins (81), the top of described block piece (9) has connecting wall (94) is set along front and back, and described connecting wall (94) is threaded by the lower surface of screw (13) with described two joint pins (81).
4. the extension ladder with finger pinch device according to claim 3, it is characterized in that: the connecting wall of described block piece (94) is provided with the transition pushing block (10) that the relative connecting wall (94) of energy moves up and down, move on this transition pushing block (10) and can touch automatic unlocking switch (7), collapse and touch when arriving to subordinate's adapter sleeve (3) at extension ladder, described impeller (8) can contact with transition pushing block (10) and drive on transition pushing block (10) and move.
5. the described extension ladder with finger pinch device of arbitrary claim according to claim 1～4, it is characterized in that: described automatic unlocking switch (7) rotates and is arranged in adapter sleeve (3), the rotational of automatic unlocking switch (7) drives latch (4) transverse shifting, and described impeller (8) can insert in adjacent higher level's adapter sleeve (3) and promotion automatic unlocking switch (7) rotation.
6. the extension ladder with finger pinch device according to claim 5, 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 form, described shaft (71) constrains in 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) is connected with described latch (4), the outer end of horizontal part (73) exposes outside adapter sleeve (3) downwards, described impeller (8) inserts and to promote the outer end of horizontal part (73) after adapter sleeve in adjacent higher level's latch-up structure and automatic unlocking switch (7) is rotated.
7. the extension ladder with finger pinch device according to claim 6, it is characterized in that: have the first cannelure (41) in the middle part of described latch (4), the upper end of described vertical portion (72) is circular-arc and has draw-in groove (721), and this draw-in groove (721) is stuck in the first cannelure (41) and with the end face of the first cannelure (41) and touches.
8. the extension ladder with finger pinch device according to claim 5, it is characterized in that: the inboard of described adapter sleeve (3) has the insertion section (32) of pegging graft with crosspiece (2), have cavity (321) in insertion section (32), described latch (4), automatic unlocking switch (7) and spring (5) are positioned at this cavity (321); Adapter sleeve (3) outside has annular surface, this annular surface forms the socket (33) with pole (1) socket, has the through hole (331) that connects and pass for latch (4) with cavity (321) on socket (33) wall.
9. the extension ladder with finger pinch device according to claim 8, it is characterized in that: also be fixed with a spring base (12) in the cavity of described insertion section (321), has containing hole (121) on spring base (12), the rear portion of described latch (4) is positioned at the front portion of containing hole (121), described spring (5) is positioned at the rear portion of containing hole (121), 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 rear inwall of containing hole (121).
10. the extension ladder with finger pinch device according to claim 9, it is characterized in that: the bar hole (322) that has horizontally set on the front end face of described insertion section (32) and communicate with described cavity (321), latch (4) middle part has the second cannelure (42), described pushing away turned round outside the front end face that (6) be positioned at insertion section (32), 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 after bar hole (322) in described the second cannelure (42) and with the end face touching of the second cannelure (42).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110193199 CN102278059B (en) | 2011-07-08 | 2011-07-08 | Extension ladder with finger-protected device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110193199 CN102278059B (en) | 2011-07-08 | 2011-07-08 | Extension ladder with finger-protected device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102278059A CN102278059A (en) | 2011-12-14 |
| CN102278059B true CN102278059B (en) | 2013-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110193199 Active CN102278059B (en) | 2011-07-08 | 2011-07-08 | Extension ladder with finger-protected device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015018661A1 (en) * | 2013-08-09 | 2015-02-12 | Patentselskabet Af 10. December 2010 Aps | Collapsible ladder |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106150334A (en) * | 2016-08-30 | 2016-11-23 | 潘跃进 | Novel extension ladder |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7048094B2 (en) * | 2002-08-02 | 2006-05-23 | Core Distribution, Inc. | Extending ladder and associated manufacturing methods |
| CN200985735Y (en) * | 2006-12-13 | 2007-12-05 | 马立育 | Telescopic ladder |
| CN102003136A (en) * | 2010-10-28 | 2011-04-06 | 王万兴 | Locking structure for telescopic ladder |
| CN202300169U (en) * | 2011-07-08 | 2012-07-04 | 王万兴 | Extension ladder with device for preventing hands from being clamped |
-
2011
- 2011-07-08 CN CN 201110193199 patent/CN102278059B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7048094B2 (en) * | 2002-08-02 | 2006-05-23 | Core Distribution, Inc. | Extending ladder and associated manufacturing methods |
| CN200985735Y (en) * | 2006-12-13 | 2007-12-05 | 马立育 | Telescopic ladder |
| CN102003136A (en) * | 2010-10-28 | 2011-04-06 | 王万兴 | Locking structure for telescopic ladder |
| CN202300169U (en) * | 2011-07-08 | 2012-07-04 | 王万兴 | Extension ladder with device for preventing hands from being clamped |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015018661A1 (en) * | 2013-08-09 | 2015-02-12 | Patentselskabet Af 10. December 2010 Aps | Collapsible ladder |
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| Publication number | Publication date |
|---|---|
| CN102278059A (en) | 2011-12-14 |
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