CN202300169U - Extension ladder with device for preventing hands from being clamped - Google Patents
Extension ladder with device for preventing hands from being clamped Download PDFInfo
- Publication number
- CN202300169U CN202300169U CN 201120242940 CN201120242940U CN202300169U CN 202300169 U CN202300169 U CN 202300169U CN 201120242940 CN201120242940 CN 201120242940 CN 201120242940 U CN201120242940 U CN 201120242940U CN 202300169 U CN202300169 U CN 202300169U
- Authority
- CN
- China
- Prior art keywords
- latch
- adapter sleeve
- extension ladder
- automatic unlocking
- unlocking switch
- 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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- 238000003780 insertion Methods 0.000 claims description 18
- 230000037431 insertion Effects 0.000 claims description 18
- 230000007704 transition Effects 0.000 claims description 15
- 238000007598 dipping method Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 5
- 230000000903 blocking effect Effects 0.000 abstract 7
- 210000003811 finger Anatomy 0.000 description 14
- 238000005516 engineering process Methods 0.000 description 2
- 210000003813 thumb Anatomy 0.000 description 2
- 230000008602 contraction Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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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
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- Ladders (AREA)
Abstract
The utility model relates to an extension ladder with a device for preventing hands from being clamped, which comprises segment rods and rungs. The segment rods and the corresponding rungs are connected together through connecting sleeves. Plug pins and pushing buttons are arranged in the connecting sleeves. The extension ladder with the device for preventing the hands from being clamped is characterized in that automatic unlocking switches are further arranged in the connecting sleeves, pushing pieces are fixed on the upper end faces of the connecting sleeves, blocking pieces are fixed on the lower end faces of the connecting sleeves, each blocking piece is provided with two blocking walls extending downwards and arranged at intervals, and each automatic unlocking switch is located between the two blocking walls. The inner side faces of the pushing pieces and the blocking walls are inclined planes inclining outward from bottom to top. Due to the fact that upper-stage connecting sleeves and lower-stage connecting sleeves are supported by the blocking walls and the pushing pieces, every two adjacent rungs form a safety space. The inclined planes of the pushing pieces and the blocking walls in the downward movement process are held by fingers on the segment rods to be pushed inward so as to enable the fingers to be located in the safety space between every two adjacent rungs and effectively prevent the fingers from being clamped.
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 extension ladder relatively 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 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 through 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.Telescopic ladder can extend ladder in use, and when collection, ladder is folded up.
Like a patent No. is the extension ladder of a kind of conventional structure the Chinese utility model patent " extension ladder " of ZL200620141000.4 (notification number is CN200985735Y) has disclosed.
Existing extension ladder can collision after two adjacent crosspieces are collapsed and contact when shrinking, and safe space promptly is not set after taking between the adjacent crossbars, if at this moment finger is just in time between two cross bars, will cause damage by the pressure touch finger.Existing in addition extension ladder must one when shrinking next the button pressed on each crosspiece could ladder be folded fully, it is time-consuming that this just makes this ladder fold up.
The utility model content
The utility model technical problem to be solved is to above-mentioned prior art present situation a kind of extension ladder with finger pinch device to be provided; 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 utility model solves the problems of the technologies described above the technical scheme that is adopted: a kind of extension ladder with finger pinch device; Include two vertical relatively terraced bars that are provided with; And many crosspieces that are arranged between this two terraced bar; Each terraced bar is made up of the socket of more piece pole telescopically, and said pole and corresponding crosspiece link together through adapter sleeve; Be provided with latch in the 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 the said adapter sleeve, and drive horizontal mobile the pushing away of latch and turn round; It is characterized in that: also be provided with the automatic unlocking switch that links to each other with latch in the said 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, and block piece has two to the retaining wall that extends below and be provided with at interval, and said automatic unlocking switch is between two retaining walls; Collapse and touch when arriving to subordinate's adapter sleeve at extension ladder, the automatic unlocking switch is inserted into impeller between two retaining walls and directly or indirectly touches and drive latch and laterally move and release; The medial surface of said impeller is outward-dipping from bottom to top inclined-plane, and the retaining wall medial surface of said 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 to outer lug, has the hole that supplies said stuck point to snap on the said corresponding pole, being hidden in the hole bottom of said retaining wall.Card through stuck point and hole is joined; Make the tightr of block piece and pole applying; Being hidden in bottom in the hole of retaining wall 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 the 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 two joint pins that extend below and be provided with at interval along front and back; Have on the said adapter sleeve and vertically run through the jack that supplies two joint pins to pass; The top of said block piece has along front and back connecting wall is set, and said connecting wall is threaded through the lower surface of screw with said two joint pins.Through 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 ability 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, said impeller can contact with the transition pushing block and drive on the transition pushing block and move.So better the impeller on the adapter sleeve contacts with the automatic unlocking switch ahead of time, in identical moving range, makes automatic unlocking switch rotational angle bigger, and the height of impeller also can suitably reduce simultaneously.
Above-mentioned automatic unlocking switch rotates and is arranged in the adapter sleeve, and the rotation of automatic unlocking switch can drive latch and laterally move, and said 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 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; Said shaft constrains in the adapter sleeve and can rotate around self axis, and vertically the inner of the lower end of portion and horizontal part all fixed with shaft, and vertically the upper end of portion links to each other with said latch; The outer end of horizontal part exposes outside adapter sleeve downwards, and said impeller inserts and promotes the outer end of horizontal part behind adjacent higher level's adapter sleeve 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.
Above-mentioned latch middle part has first cannelure, and the upper end of said vertical portion is circular-arc and has draw-in groove, and this draw-in groove is stuck in first cannelure and with the end face of first cannelure and touches.And the automatic unlocking switch is stuck in through the vertical portion on it and realizes in first cannelure being connected of automatic unlocking switch and latch, so assembling is also very convenient.Vertically the end face of the portion and first cannelure is that cambered surface contacts, and when the automatic unlocking switch rotates, can easily promote the horizontal slippage of latch like this.
The inboard of above-mentioned adapter sleeve has the insertion section of pegging graft with crosspiece, has cavity in the insertion section, and said 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; Have containing hole on the spring base, the rear portion of said latch then is positioned at the front portion of containing hole, and said 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.
The bar hole that has horizontally set on the front end face of above-mentioned insertion section and communicate with said cavity; The latch middle part has second cannelure; Said 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 said second cannelure and with the end face touching of second cannelure.This pushes away the connected mode of turning round through buckle and is connected with latch, has convenient installation.
Compared with prior art; The advantage of the utility model is: owing to pass through the support of retaining wall and impeller up and down between the two-stage adapter sleeve; Form safe spacing between two crosspieces about adjacent, the automatic unlocking switch is hidden between the retaining wall of block piece, and impeller is accomplished with contacting between retaining wall of automatic unlocking switch; So when higher level's crosspiece was displaced downwardly to subordinate's crosspiece together with adapter sleeve, finger can not be sandwiched between impeller and the automatic unlocking switch; And the inner face of impeller and retaining wall is the inclined-plane, and the inclined-plane can inwardly be pushed the finger that is held on the pole open in the folding process, makes finger in the safe spacing between two crosspieces up and down, effectively prevents tong; When the release step by step of needs single-unit, then 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 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 adapter sleeve is together with crosspiece past moving down under the effect of deadweight; Impeller on the adapter sleeve in subordinate's crosspiece directly or indirectly contacts with the automatic unlocking switch and promotes the automatic unlocking switch and rotate; The final latch lateral inward that drives moves this grade of releasing latch-up structure, and 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 (contraction state) of the utility model embodiment;
Fig. 2 is the sectional view (released state) of latch-up structure among the utility model embodiment;
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 among the utility model embodiment;
Fig. 5 is installed in the perspective view on the adapter sleeve for pushing away to turn round with automatic unlocking switch and latch among the utility model embodiment;
Fig. 6 is the three-dimensional exploded view of latch-up structure among the utility model embodiment;
Fig. 7 is for pushing away the solid assembling sketch map of turning round with automatic unlocking switch and latch among the utility model embodiment;
The perspective view that Fig. 8 automatically terminates for the utility model embodiment step by step.
The specific embodiment
Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.
Shown in Fig. 1～8, be a preferred embodiment of the utility model.
A kind of extension ladder with finger pinch device; Include two vertical relatively terraced bars that are provided with; And the many crosspieces 2 that are arranged between this two terraced bar, each terraced bar is made up of the 1 telescopically socket of more piece pole, and pole 1 links together through adapter sleeve 3 with corresponding crosspiece 2.
The inboard of adapter sleeve 3 has the insertion section 32 of pegging graft with crosspiece 2; Has cavity 321 in the insertion section 32; The lower ending opening of this cavity 321; Be convenient to each parts is installed in the cavity 321, crosspiece 2 and fixing with crosspiece 2 is inserted in insertion section 32, 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 through 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 first cannelure 41; This latch 4 adapter sleeve 3 horizontal cross relatively moves and can expose and will be adjacent two save bars 1 and lock together up and down, is provided with the spring 5 that makes latch 4 remain the trend of exposing in the 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; A last joint joint bar 1 middle part that is plugged in aforementioned pole 1 also is provided with a lockhole 15, after latch 4 passes the through hole 331 of adapter sleeve 3, gets into successively in the lockhole 14,15 of adjacent two poles 1, 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 32; Push away to turn round on 6 the 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 the crosspiece 2; Therefore also have and aforementioned bar hole 322 corresponding bar holes on the sidewall of crosspiece 2, have second cannelure 42, push away and turn round 6 connecting portion 61 and pass successively to be buckled in second cannelure 42 and behind bar hole and the bar hole on the insertion section 322 on the crosspiece 2 and touch with the end face of second cannelure 42 at latch 4 middle parts.
Also be provided with the automatic unlocking switch 7 that links to each other with latch 4 in the cavity 321 of adapter sleeve 3; Automatic unlocking switch 7 is L-shaped; Automatic unlocking switch 7 is by shaft 71, vertically portion 72 and horizontal part 73 3 parts are formed, the part that is formed in one of the automatic unlocking switch 7 in the present embodiment.Automatic unlocking switch 7 rotates through 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; Vertically the inner of the lower end of portion 72 and horizontal part 73 all fixed with the middle part of shaft 71; Vertically the upper end of portion 72 is circular-arc and has draw-in groove 721, and this draw-in groove 721 is stuck in first cannelure 41 and with the end face of 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 the retaining wall that extends below and be provided with at interval along front and back 91; The lower end of the retaining wall 91 of each block piece all has the stuck point 93 to outer lug, has two holes 11 that supply stuck points 93 to snap on the corresponding pole 1, being hidden in bottom in the hole 11 of retaining wall 91; The bottom of impeller 8 has to two joint pins 81 that extend below and be provided with at interval along front and back; Have on the adapter sleeve 3 and vertically run through the jack 31 that supplies two joint pins 81 to pass; The top of block piece 9 has along front and back connecting wall 94 is set, and connecting wall 94 is threaded through 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 ability 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 the transition pushing block 10, move on the 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.
The operating principle and the process of this latch-up structure are following.
As shown in Figure 4, during locking, move on the last joint joint bar 1; When moving to correct position, lock hole 11,12 is positioned on the same axis on the promptly adjacent two joint joint bars 1, 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.
Like Fig. 1～3, shown in 8; 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.
Like Fig. 1～3, shown in 8; Automatically terminate higher level's latch-up structure step by step, push away earlier 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; 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 the transition pushing block 10, move on the 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 latch-up structure in laterally except that this grade crosspiece 2; 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 pass through the support of retaining wall 91 and impeller 8 up and down between the two-stage adapter sleeve; The adjacent safe spacing X that forms between two crosspieces 2 up and down, automatic unlocking switch 7 is hidden between two retaining walls 91 of block piece, and impeller 8 is accomplished with contacting between retaining wall 91 of automatic unlocking switch 7; So 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 the automatic unlocking switch 7; And the inner face 81,92 of impeller 8 and retaining wall 91 is the inclined-plane, and the inclined-plane can inwardly be pushed the finger that is held on the pole open in the folding process, makes finger in the safe spacing between two crosspieces up and down, effectively prevents tong.
Claims (10)
1. extension ladder with finger pinch device; Include two vertical relatively terraced bars that are provided with; And the many crosspieces (2) that are arranged between this two terraced bar, each terraced bar is made up of more piece pole (1) telescopically socket, and said pole (1) and corresponding crosspiece (2) link together through adapter sleeve (3); 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 said 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 said 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 to the retaining wall (91) that extends below and be provided with at interval; Collapse and touch when arriving to subordinate's adapter sleeve (3) at extension ladder, said automatic unlocking switch (7) is inserted into impeller (8) between two retaining walls and directly or indirectly touches and drive latch (4) and laterally move and release; The medial surface (81) of said impeller (8) is outward-dipping from bottom to top inclined-plane, and the medial surface (92) of the retaining wall of said 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 said block piece (91) has the stuck point (93) to outer lug; Have the hole (11) that supplies said stuck point (93) to snap on the said corresponding pole (1), being hidden in bottom in the hole (11) of said retaining wall (91).
3. the extension ladder with finger pinch device according to claim 1; It is characterized in that: the bottom of said impeller (8) has to two joint pins (81) that extend below and be provided with at interval along front and back; Have on the said adapter sleeve (3) and vertically run through the jack (31) that supplies two joint pins (81) to pass; The top of said block piece (9) has along front and back connecting wall (94) is set, and said connecting wall (94) is threaded through the lower surface of screw (13) with said 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 said block piece (94) is provided with the transition pushing block (10) that the relative connecting wall (94) of ability 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, said impeller (8) can contact with transition pushing block (10) and drive on the transition pushing block (10) and move.
5. according to the described extension ladder of arbitrary claim in the claim 1～4 with finger pinch device; It is characterized in that: said 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, and said 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: said automatic unlocking switch (7) is L-shaped; Automatic unlocking switch (7) is made up of shaft (71), vertical portion (72) and horizontal part (73) three parts; Said shaft (71) constrains in the adapter sleeve (3) and can rotate around self axis; Vertically the lower end of portion (72) and horizontal part (73) is inner all fixing with shaft (71); Vertically the upper end of portion (72) links to each other with said latch (4), and the outer end of horizontal part (73) exposes outside adapter sleeve (3) downwards, promotes the outer end of horizontal part (73) behind the adapter sleeve in the adjacent higher level's latch-up structure of said impeller (8) insertion and makes automatic unlocking switch (7) rotation.
7. the extension ladder with finger pinch device according to claim 6; It is characterized in that: said latch (4) middle part has first cannelure (41); The upper end of said vertical portion (72) is circular-arc and has draw-in groove (721), and this draw-in groove (721) is stuck in first cannelure (41) and with the end face of 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 said adapter sleeve (3) has the insertion section (32) of pegging graft with crosspiece (2); Have cavity (321) in the insertion section (32), said latch (4), automatic unlocking switch (7) and spring (5) are positioned at this cavity (321); Adapter sleeve (3) outside has annular surface, and 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 said insertion section (321); Have containing hole (121) on the spring base (12), the rear portion of said latch (4) then is positioned at the front portion of containing hole (121), and said 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 back 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 said insertion section (32) and communicate with said cavity (321); Latch (4) middle part has second cannelure (42); Said 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 behind the bar hole (322) in said second cannelure (42) and with the end face touching of second cannelure (42).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120242940 CN202300169U (en) | 2011-07-08 | 2011-07-08 | Extension ladder with device for preventing hands from being clamped |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120242940 CN202300169U (en) | 2011-07-08 | 2011-07-08 | Extension ladder with device for preventing hands from being clamped |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202300169U true CN202300169U (en) | 2012-07-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120242940 Expired - Lifetime CN202300169U (en) | 2011-07-08 | 2011-07-08 | Extension ladder with device for preventing hands from being clamped |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202300169U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102278059A (en) * | 2011-07-08 | 2011-12-14 | 王万兴 | Extension ladder with finger-protected device |
| EP3211174A1 (en) * | 2016-02-29 | 2017-08-30 | Core Distribution Inc. | Telescoping ladder with a cascading collapse mechanism |
| CN107512227A (en) * | 2017-08-11 | 2017-12-26 | 长治清华机械厂 | The sequential telescopic formula access step of adjustable in length |
| CN110344747A (en) * | 2014-08-18 | 2019-10-18 | 兰普控股私人有限公司 | Telescopic ladder assembly |
-
2011
- 2011-07-08 CN CN 201120242940 patent/CN202300169U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102278059A (en) * | 2011-07-08 | 2011-12-14 | 王万兴 | Extension ladder with finger-protected device |
| CN102278059B (en) * | 2011-07-08 | 2013-06-05 | 王万兴 | Extension ladder with finger-protected device |
| CN110344747A (en) * | 2014-08-18 | 2019-10-18 | 兰普控股私人有限公司 | Telescopic ladder assembly |
| EP3211174A1 (en) * | 2016-02-29 | 2017-08-30 | Core Distribution Inc. | Telescoping ladder with a cascading collapse mechanism |
| WO2017151558A1 (en) * | 2016-02-29 | 2017-09-08 | Core Distribution, Inc. | Telescoping ladder with a cascading collapse mechanism |
| CN108884704A (en) * | 2016-02-29 | 2018-11-23 | 科尔分配股份有限公司 | Extension ladder with staged fold mechanism |
| US20190055783A1 (en) * | 2016-02-29 | 2019-02-21 | Core Distribution, Inc. | Telescoping ladder with a cascading collapse mechanism |
| US10995547B2 (en) | 2016-02-29 | 2021-05-04 | Core Distribution, Inc. | Telescoping ladder with a cascading collapse mechanism |
| CN107512227A (en) * | 2017-08-11 | 2017-12-26 | 长治清华机械厂 | The sequential telescopic formula access step of adjustable in length |
| CN107512227B (en) * | 2017-08-11 | 2023-05-30 | 山西航天清华装备有限责任公司 | Sequential telescopic boarding ladder with adjustable length |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120704 Effective date of abandoning: 20130605 |
|
| RGAV | Abandon patent right to avoid regrant |