一种具有防夹手装置的伸缩梯技术领域 本发明涉及一种具有若干可相对滑动并且相互嵌套在一起的梯杆的伸缩梯，特别涉及一种具有防夹手装置的伸缩梯。 BACKGROUND telescopic ladder having a finger protection means  The present invention relates to a plurality of slidable relative to each other and have a nested extension ladder of the ladder bar, and particularly relates to a telescopic ladder having a finger protection means . 背景技术目前关于伸缩梯的专利文献有很多，有一号为US7048094的美国专利公开了一种这样使用方便安全的伸缩梯，该梯子包括:第一梯杆，第二梯杆以及设置在第一梯杆和第二梯杆之间的若干横档；第一梯杆包括有第一节杆和第二节杆，该第一节杆包括有一内表面，第二节杆通过嵌套的方式和第一节杆连接成一可沿长度方向相对运动的伸缩结构；一锁定机构，可选择地将第二节杆相对第一节杆锁紧；一按钮，可操作地连接在锁定机构上，用于操控该锁定机构；本专利的特征在于，所述的按钮设置在靠近第一节杆的位置，并具有一个可与拇指指尖大小相适配的凹部，拇指指尖放在该凹部内可沿着从第一节杆往第二节杆的方向推动按钮而取消锁定机构对第二节杆的锁紧；一套管，套设在第二节杆的外表面上；该套管具有和第一节杆的内表面相接触的  Currently on the telescopic ladder there are many patent document, there is the 1st U.S. Patent US7048094 discloses a convenient and safe to use such a telescopic ladder, the ladder comprising: a first stile, a second stile arranged and a plurality of ladder rungs between the first lever and the second lever ladder; a first ladder bar comprises a first bar and a second bar, the first pole comprises an inner surface, the second lever by nested embodiment and the first lever may be connected to a telescopic structure along the longitudinal direction of the relative movement; a locking mechanism to selectively lock the second lever opposite the first shaft; a button operatively connected to the locking mechanism, for actuating the locking mechanism; feature of this patent is that the button is provided at a position close to the first bar and having a recessed portion may be adapted to the size of the fingertip of the thumb, the thumb finger on the concave portion cancel button may be pushed along a direction from a first to a second lever of the lever mechanism for locking the second locking bar; a sleeve, a second sleeve disposed on the outer surface of the rod; the sleeve having and the inner surface of the first contact with the rod 外导向面。 An outer guide surface. 可伸缩的梯子能够在使用时将梯子伸长，而在收藏时将梯子折叠起来。 Retractable ladder ladder can be stretched in use, while in the ladder folded collection.  如一专利号为ZL200620141000.4(公告号为CN200985735Y)的中国实用新型专利《伸缩梯》披露了这样一种常规结构的伸缩梯。  If a patent number ZL200620141000.4 (Bulletin No. CN200985735Y) of China utility model patents "extension ladder" discloses an extension ladder conventional structure.  现有的伸缩梯在收缩时，相邻的两横档塌缩后会碰撞并接触在一起，即相邻横杆之间在收纳后没有设置安全空隙，如果这时手指正好位于两横杆之间，就会压碰手指造成损伤。  In conventional telescopic ladder contraction, the adjacent two rungs collide and contacted together, i.e., no gap between the security bar provided in the housing adjacent the collapsed, located just two fingers if the time between the rails, it will touch a finger pressure damage. 另外现有伸缩梯在收缩时必须一次一个地按下每个横档上的按钮才能将梯子完全折收起来，这就使得这种梯子折叠起来费时。 Further conventional telescopic ladder must be in the retracted one at a time to press the button on each rung of the ladder is completely folded away, which makes this ladder folded consuming. 发明内容 本发明所要解决的技术问题是针对上述现有技术现状而提供一种具有防夹手装置的伸缩梯，该伸缩梯在使用时更安全，另外既可单节逐级解锁、又可实现当下级锁定结构解锁后能将相邻的上级锁定结构自动解锁。 SUMMARY OF THE INVENTION  The present invention solves the technical problem of the prior art for the above-described circumstances to provide a means of splines extending ladder, extension ladder when the safer, both single additional stepwise unlocking, while achieving a lower level when the locking mechanism can unlock the lock structure adjacent to the superior automatically unlocked.  本发明解决上述技术问题所采用的技术方案为:一种具有防夹手装置的伸缩梯，包括有二根相对竖向设置的梯杆，及多根设置在该两梯杆之间的横档，各梯杆由多节节杆可伸缩地套接组成，所述节杆和相应横档通过连接套连接在一起；连接套内设有插销，该插销能相对连接套水平横向移动并能露出而将相邻的上下两节节杆锁定在一起，所述连接套内设有使插销始终保持外露趋势的弹簧，及驱动插销横向移动的推扭；其特征在于:所述连接套内还设有与插销相连的自动解锁开关，连接套的上端面固定有向上凸起的推动件，连接套的下端面固定有遮挡件，遮挡件具有两向下延伸并间隔设置的挡壁，所述自动解锁开关位于两挡壁之间，在伸缩梯塌缩并触抵到下级连接套时，自动解锁开关被插入两挡壁之间的推动件直接或间接触动并带动插销横向移动而  The present invention solves the above technical problem is technical solution: a telescopic ladder having a finger protection device, comprising two ladder bars arranged vertically opposite and disposed between the plurality of two ladder bars rungs, the ladder bars each of a plurality steadily sleeved rod telescopically composition, and the rod section by a respective crosspiece connecting sleeve are connected together; connecting sleeve provided with bolt, the bolt can be moved laterally horizontally relative to the connector sleeve and can be exposed to two adjacent vertical rod steadily locked together, so that the connecting sleeve is provided with the latch spring trend remains exposed, and the driving pin moves laterally pushing and twisting; characterized in that: said connection sleeve it also offers a unlock switch connected with the latch, the connecting sleeve is fixed to the end face of the pushing member projecting upwardly, the lower end connecting sleeve is fixed to the shutter member, the shutter member having two downwardly extending and spaced retaining wall, the automatic unlock switch located between two retaining walls, contraction and contacts against the lower connection to the sleeve, the unlock switch is automatically inserted between two pusher retaining wall and driven directly or indirectly touch the latch in lateral movement of the telescopic ladder collapse 锁；所述推动件的内侧面为自下而上向外倾斜的斜面，所述遮挡件的挡壁内侧面为自上而下向外倾斜的斜面。 Lock; inner side surface of said pushing member is inclined outwardly from bottom to top inclined surface, the shutter member side surface of the retaining wall is inclined outwardly from top to bottom ramp.  上述遮挡件的挡壁的下端具有向外凸起的卡点，所述相应节杆上开有供所述卡点卡入的孔，所述挡壁的最下端藏于孔内。  The lower end of the retaining wall of the shield member having an outwardly protruding point card, the respective bar section of the card is opened for the card into the hole, the retaining wall is hidden in the lowermost hole. 通过卡点与孔的卡配，使遮挡件与节杆贴合的更紧密，另外挡壁的最下端藏于孔内，这样挡壁的下端就不会外露出节杆，挡壁的下端与节杆周面之间不会有间隙，防止当上级横档下移过程中挡壁夹到手指，使用更安全。 Point through the card aperture with the card, so that the shutter member and the rod section more closely bonded, additional retaining wall is hidden in the hole of the lowermost end, so that the lower end of the retaining wall will not be exposed to the outside section of the rod, the lower end of the retaining wall and section bar will not have a gap between the circumferential surface, to prevent the upper rail when the process down and caught in the retaining wall, safer to use.  上述推动件的底部具有向下延伸并沿前后间隔设置的两连接柱，所述连接套上开有竖向贯穿供两连接柱穿过的插孔，所述遮挡件的上部具有沿前后设置连接壁，所述连接壁通过螺钉与所述两个连接柱的下端面螺纹连接。 The bottom of the  two said pushing member having a connecting post extending downwardly and spaced along the front and rear, said receptacle connector sleeve has a vertical through-opening for the two connecting post passes, the shield member having an upper edge provided before and after the connecting wall, said connecting wall and the lower end surface by a screw threaded connection of the two connecting columns. 通过连接柱与连接壁的连接，很好的将推动件和遮挡件与连接套固定在一起。 Column connection by the connecting wall, the well member and the shutter member and the push sleeve are connected together.  上述遮挡件的连接壁上设有能相对连接壁上下移动的过渡推块，该过渡推块的上移能触动自动解锁开关，在伸缩梯塌缩并触抵到下级连接套时，所述推动件能与过渡推块接触而带动过渡推块上移。  connecting wall of said shutter member is provided at the transition of the pusher block can be moved relative to the lower wall of the connection, the push block transition shift automatically unlock switch can touch, touch and condensing against the lower connecting sleeve collapsed telescopic ladder, the pusher can be in contact with the transition shifted to drive the push block on the push block transition. 这样能更好连接套上的推动件提早与自动解锁开关接触，在相同的移动范围内使自动解锁开关转动角度更大，同时推动件的高度也可适当降低。 This can better advance pusher sleeve connected to the contact with the switch to automatically unlock the unlocked within the same moving range of the rotation angle greater switch, while the height of the pushing member can also be appropriately reduced.  上述自动解锁开关转动设置在连接套内，自动解锁开关的转动能带动插销横向移动，所述推动件能插入相邻的上级连接套内而推动自动解锁开关转动。  The automatic rotation of the unlocking switch disposed in the connecting sleeve, driven by the automatic rotation could move laterally unlock switch latch, said pushing member to be inserted adjacent to the upper connecting sleeve to push the unlocking switch automatically rotated. 转动解锁的方式更为平稳，当然自动解锁开关也可以采用能水平移动的方式设置在连接套内，推动部自动解锁开关采用斜面配合结构，而使在伸缩梯塌缩并触抵到下级连接套时，推动部能推动自动解锁开关横移而解锁。 Unlocking the rotation is more stable manner, of course, can also be used to automatically unlock switch horizontally movably disposed in the connecting sleeve, the pushing portion automatically unlock switch with chamfer mating structure, the reduction in the collapsed telescopic ladder and connected to the lower sleeve abutting contact when the push switch portion can promote traverse automatically unlock unlocked.  上述自动解锁开关呈L形，自动解锁开关由转轴部、竖直部和水平部三部分组成，所述转轴部约束在连接套内并能绕自身轴线旋转，竖直部的下端和水平部的内端均与转轴部固定，竖直部的上端与所述插销相连，水平部的外端向下外露出连接套，所述推动件插入相邻的上级连接套后推动水平部的外端而使自动解锁开关转动。  The L-shaped unlocking switch automatically, automatically unlock switch shaft portion consists of three parts, consisting of a vertical portion and a horizontal portion, the shaft portion connected to the lower end of sleeve and constrained rotatable about its own axis, and the vertical portion the inner end of the horizontal portion of the upper shaft portion are fixed, the vertical portion of the latch is connected to the outer end of the horizontal portion of the connecting sleeve downwardly exposed to the outside, the pushing member is inserted adjacent to the upper horizontal portion after pushing the connecting sleeve the outer end of the unlocking switch automatically rotated. 将自动解锁开关设置成L形在满足自动解锁开关能被推动部带动转动最终带动插销移动的前提下，其结构最为简单。 Automatic unlocking switch disposed in an L-shape to be pushed to meet the automatic unlocking switch unit driven in rotation and ultimately drive the pin moves under the premise that the most simple structure. 当然自动解锁开关也可设计成其它外形，只要能满足自动解锁开关的转动能带动插销横向移动即可。 Of course, also be designed to automatically unlock switch into other shape, as long as the automatic rotation could meet the unlock switch drive latch to move laterally.  上述插销中部具有第一环形槽，所述竖直部的上端呈圆弧状并具有卡槽，该卡槽卡在第一环形槽内并与第一环形槽的端面触碰。  The central plug having a first annular groove, the upper end of the vertical portion and having an arcuate slot, the card slot in a first annular groove and the first end surface touching the annular groove. 而且自动解锁开关通过其上的竖直部卡在第一环形槽内而实现自动解锁开关与插销的连接，故组装也很方便。 And automatically unlock switch through which the vertical portion of the first annular groove and the card automatically unlock switch is connected with the latch, it is also very easy to assemble. 竖直部和第一环形槽的端面为弧面接触，这样当自动解锁开关转动时能轻松推动插销横向滑移。 The vertical portion and the end face of the first annular groove is in contact with the arc, so that when the lateral slip can easily push in the latch rotates automatically unlock switch.  上述连接套的内侧具有与横档插接的插入部，插入部内具有凹腔，所述插销、自动解锁开关和弹簧位于该凹腔内；连接套外侧具有环形表面，该环形表面形成与节杆套接的套接口，套接口壁上具有与凹腔相贯通以供插销穿过的通孔。  inside the connecting sleeve has an insertion portion and the insertion of the rung, the cavity having the insertion portion, the latch, automatically unlocking switch and the spring is located within the cavity; connecting sleeve has an annular outer surface, the annular surface and the rod section of the socket socket, the socket having a wall with a through cavity for the plug to pass through the through hole. 其为连接套的常规结构，能方便将横档及节杆连接到该连接套上。 Which is a conventional structure of the connecting sleeve, and can easily rungs section bar connected to the connector sleeve.  为便于安置弹簧，上述插入部的凹腔内还固定有一弹簧座，弹簧座上具有容置孔，所述插销的后部则位于容置孔内的前部，所述弹簧位于容置孔内的后部，弹簧的一端抵靠在插销的后部，弹簧的另一端抵靠在容置孔的后内壁上。  In order to facilitate placement of the spring, within the cavity of the insertion portion is also fixed to a spring seat, the spring seat having a receiving hole, it is located at the rear of the front portion of the plug receiving bore, a spring located in the receiving hole facing the rear, the rear end of the spring against the latch, the other end of the spring abuts against the rear inner wall of the receiving hole.  上述插入部的前端面上开有横向设置并与所述凹腔相通的条形孔，插销中部具有第二环形槽，所述推扭位于插入部的前端面外，推扭的后端面上具有向后延伸的连接部，该连接部穿过条形孔后卡扣在所述第二环形槽内并与第二环形槽的端面触碰。  surface of the distal end portion of the insertion opening and provided with a transverse cavity communicating with said rectangular hole, a second annular groove having a central pin, the pushing and twisting at the front face of the insertion portion, the pushing and twisting of the the end face has a connecting portion extending rearwardly, and snap the connecting portion and the end face touching the second annular groove in said second annular groove after passing through the rectangular hole. 该推扭通过卡扣的连接方式与插销连接，具有安装方便的优点。 The push and twist through a snap-fit connection with the latch connection, convenient installation advantages.  与现有技术相比，本发明的优点在于:由于上下两级连接套之间通过挡壁和推动件的支撑，相邻上下两横档之间形成安全间距，自动解锁开关藏于遮挡件的挡壁之间，推动件与自动解锁开关的接触在挡壁之间完成，故当上级横档连同连接套下移至下级横档时，手指不会被夹于推动件与自动解锁开关之间；而且推动件和挡壁的内端面均为斜面，下移过程中斜面会将握在节杆上的手指向内推开，使手指位于上下两横档之间的安全间距内，有效防止夹手；当需要单节逐级解锁，则需从伸缩梯的上级横档逐级往下级解锁，解锁时只需推动推扭，推扭带动插销横向朝内移动便能解除伸缩梯相邻上下两节节杆的锁定；当先将下级锁定结构解锁后，其相邻的上级连接套连同横档在自重的作用下往下移，直至下级横档中的连接套上的推动件与自动解锁开关直接  Compared with the prior art, advantages of the present invention is that: since the connection between the two sets of upper and lower retaining wall and by pushing the supporting member, the spacing between adjacent upper and lower forming a security crosspiece automatically unlock hidden switch the shutter member between the retaining wall, the pusher automatically unlock switch contact between the retaining wall is completed, so that when the upper rail moves, together with the coupling sleeve when the lower rung, the finger is not caught in the automatic unlocking pusher between the switch; and pushing member and the inner end surface of the retaining wall are inclined surfaces, during ramp down will be held in the open section of rod fingers inwardly, the finger is located in the safe distance between the upper and lower rungs, effectively prevent the clip hands; when it is necessary to unlock a single cascade, is required from the upper extension ladder rungs down stepwise unlocking stage, simply pushing the push twisting, pushing and twisting movement of drive pin laterally inwardly extending ladder will be able to release the unlocking phase o the upper and lower lock lever steadily; head after unlocking the lower locking structure, adjacent the upper connecting sleeve together with the rungs shift downward under its own weight, until the pusher sleeve connected to the lower rungs of the automatic direct unlock switch 间接接触而推动自动解锁开关转动，最终带动插销横向朝内移动解除该级锁定结构，以此类推，其能逐级自动解除上级锁定结构；因此本锁定结构具有解锁方式多样性的特点，因此操作更加方便。 Indirect contact to push the unlock switch automatically rotated, the final driven laterally inward movement of the latch releasing the locking structure level, and so on, which can automatically release the upper locking structure stepwise; thus locking structure having features of the present unlocking diversity, so the operating More convenient. 附图说明 图1为本发明实施例的立体结构示意图(收缩状态)； 图2为本发明实施例中锁定结构的剖视图(解锁状态)； 图3为图2的AA向剖视图； 图4为本发明实施例中锁定结构的剖视图(锁定状态)； 图5为本发明实施例中推扭和自动解锁开关与插销安装在连接套上的立体结构示意图； 图6为本发明实施例中锁定结构的立体分解图； 图7为本发明实施例中推扭和自动解锁开关与插销的立体装配示意图； 图8为本发明实施例逐级自动解除的立体结构示意图。 BRIEF DESCRIPTION  FIG. 1 is a perspective schematic view of the structure (contracted state) according to an embodiment of the present invention;  FIG. 2 is a cross-sectional view (unlocked state) of the locking structure example embodiment the invention;  FIG. 3 is a diagram 2 the cross-sectional view AA;  FIG. 4 is a sectional view of the locking structure of the embodiment (locked state) the invention;  FIG. 5 embodiment and the automatic pushing and twisting unlock switch mounted in the connector and the plug sleeve embodiment of the present invention. perspective structural diagram;  FIG. 6 is an exploded perspective view of the locking structure of the embodiment of the invention;  FIG. 7 embodiment, a push and twist assembly and a schematic perspective view of the automatic switch and the unlocking pin of the invention;  FIG. 8 a perspective schematic structural diagram of stepwise automatic release of the embodiment of the present invention. 具体实施方式 以下结合附图实施例对本发明作进一步详细描述。 DETAILED DESCRIPTION  Hereinafter, the present invention will be described in further detail in conjunction with the accompanying drawings.  如图1〜8所示，为本发明的一个优选实施例。  As shown, a preferred embodiment of the present invention Example 1~8.  —种具有防夹手装置的伸缩梯，包括有二根相对竖向设置的梯杆，及多根设置在该两梯杆之间的横档2，各梯杆由多节节杆I可伸缩地套接组成，节杆I和相应横档2通过连接套3连接在一起。  - species apparatus having splines extending ladder, comprising two ladder bars arranged vertically opposite and disposed between the plurality of two rungs of the ladder bars 2, each of the ladder bars by a plurality of rod steadily I telescopically sheathing composition, and the corresponding I section bar connected together by two crosspieces connecting sleeve 3.  连接套3的内侧具有与横档2插接的插入部32，插入部32内具有凹腔321，该凹腔321的下端开口，便于将各部件安装到凹腔321内，将插入部32插入横档2并与横档2固定，横档2的下端面将凹腔321的下端开口遮蔽；连接套3外侧具有环形表面，该环形表面形成与节杆I套接的套接口33，该套接口33与节杆I上部外周紧配，并可通过螺钉将套接口33与节杆I固定。  The inner sleeve 3 has a connector insertion portion 2 and the plug ledge 32 of the insertion portion 321 having a cavity 32, the lower end opening of the cavity 321, to facilitate mounting of the components into the cavity 321, the insertion portion 32 is inserted into the rail 2 and the second fixed crosspiece, the crosspiece 2 at the lower end surface of the cavity 321 of the shield opening; connecting sleeve 3 has an annular outer surface, the annular surface is formed with a socket section I bar socket 33 the socket 33 and an upper rod section I with an outer periphery tightly, and the socket 33 by a screw with I bar section fixed.  连接套3的凹腔321内设有插销4，插销4中部具有第一环形槽41，该插销4能相对连接套3水平横向移动并能露出而将相邻的上下两节节杆I锁定在一起，连接套3内设有使插销4始终保持外露趋势的弹簧5，套接口33壁上具有与凹腔321相贯通以供插销4穿过的通孔331，与连接套3相固定的节杆I壁上开有锁孔14，插设在前述节杆I的上一节节杆I中部也设有一锁孔15，当插销4穿出连接套3的通孔331后依次进入相邻两个节杆I的锁孔14、15中，将该两节节杆I锁定。  The connecting sleeve 321 features a cavity 3 has pin 4, the central pin 4 having a first annular groove 41, the latch 4 relative to the connector sleeve 3 can move horizontally and laterally and can be exposed to two adjacent vertical rods steadily I locked together, that the connecting sleeve 3 are equipped with the latch 4 remains exposed trend spring 5, the socket 33 having a cavity wall 321 for the pin 4 passes through the through vias 331, with the connecting sleeve 3 I bar fixed wall section has a keyhole opening 14, interposed in the section of a rod I I steadily central rod 15 is also provided with a keyhole, when the piercing plug 4 connecting sleeve 3 into the through hole 331 are sequentially section I of the two adjacent rods 14, 15 in the lock hole, the two I locking lever steadily. 其为现有伸缩梯的锁定结构的常规设计。 The locking structure of conventional design which is conventional telescopic ladder.  弹簧5通过以下结构安装在凹腔321内，在凹腔321内还固定有一弹簧座12，弹簧座12上具有容置孔121，插销4的后部则位于容置孔121内的前部，弹簧5位于容置孔121内的后部，弹簧5的一端抵靠在插销4的后部,弹簧5的另一端抵靠在容置孔121的后内壁上。  The spring 5 is mounted in the cavity 321 through the structure within the cavity 321 is also fixed to a spring seat 12, the spring seat having 12 accommodating hole 121, the latch rear portion 4 is disposed in the receiving hole 121 the front portion, the rear portion 5 is located within the spring receiving hole 121, one end of the spring 5 abuts the rear portion 4 of the latch, the other end of the spring 5 abuts against the rear inner wall of the accommodating hole 121. 弹簧座12采用以下结构固定在凹腔321内，即在弹簧座12两侧具有插边122，对应，凹腔321内两侧设有供插边122插设的插槽323。 A spring seat 12 fixed to the structure adopted in the cavity 321, i.e. has an insertion edge 12 on both sides of the spring seat 122, corresponding to both sides of the inner cavity 321 is provided for the insertion edge 122 of the slot 323 is inserted.  —驱动插销4横向移动的推扭6,推扭6位于插入部32的前端面外，推扭6的后端面上具有向后延伸的连接部61，连接套的插入部32的前端面上开有横向设置并与凹腔321相通的条形孔322，当然，由于插入部32插设在横档2内，因此横档2的侧壁上也开有与前述条形孔322相应的条形孔，在插销4中部具有第二环形槽42，推扭6的连接部61依次穿过横档2上的条形孔及插入部上的条形孔322后卡扣在第二环形槽42内并与第二环形槽42的端面触碰。 The front end of the drive pin 4 moves laterally 6 pushing and twisting, pushing and twisting the insertion distal end surface 6 of the outer portion 32, the rear end surface 6 of pushing and twisting the connecting portion 61 having a rearwardly extending sleeve connected to the insertion portion 32 -  surface and is provided with a transverse opening rectangular hole 321 communicating with the cavity 322, of course, since the insertion portion 32 is inserted in the crosspiece 2, the crosspiece side wall 2 is also opened with the corresponding rectangular hole 322 rectangular hole in the central pin 4 has a second annular groove 42, pushing and twisting the connecting portion 616 sequentially passes through the rectangular hole of the crosspiece rear catch 322 on the bar and the insertion hole portion on the second ring 2 the groove 42 and the end surface touching the second annular groove 42.  连接套3的凹腔321内还设有与插销4相连的自动解锁开关7，自动解锁开关7呈L形，自动解锁开关7由转轴部71、竖直部72和水平部73三部分组成，本实施例中的自动解锁开关7为一体成型件。  The connecting sleeve 321 within cavity 3 is also provided with the latch automatically unlock switch 47 is connected, automatically unlock switch 7 is L-shaped, the automatic unlocking switch 7 by the rotary shaft portion 71, vertical portion 72 and horizontal portion 73 three parts, automatically unlock switch 7 in the present embodiment integrally molded part. 自动解锁开关7通过转轴部71转动设置在连接套3内，转轴部71约束在连接套3内并能绕自身轴线旋转，自动解锁开关7的转动能带动插销4横向移动；竖直部72的下端和水平部73的内端均与转轴部71的中部固定；竖直部72的上端呈圆弧状并具有卡槽721，该卡槽721卡在第一环形槽41内并与第一环形槽41的端面触碰；水平部73的外端向下外露出连接套3， 连接套3的上端面固定有向上凸起的推动件8，连接套3的下端面固定有遮挡件9，遮挡件9具有两向下延伸并沿前后间隔设置的挡壁91，各遮挡件的挡壁91的下端均具有向外凸起的卡点93，相应节杆I上开有两个供卡点93卡入的孔11，挡壁91的最下端藏于孔11内；推动件8的底部具有向下延伸并沿前后间隔设置的两连接柱81，连接套3上开有竖向贯穿供两连接柱81穿过的插孔31，遮挡件9的上部具有沿前后设置连接壁94，连接壁94 Automatically unlock switch 7 via a shaft portion 71 rotatably disposed within the connecting sleeve 3, the rotary shaft portion 71 in the connection sleeve and constrained for rotation about its axis 3, the automatic rotation of the unlock switch 7 can be driven laterally moving the latch 4; the vertical portion 72 of the the inner end of the lower horizontal portion 73 and are fixed to the central portion 71 of the rotary shaft; upper vertical portion 72 and having arcuate slot 721, the card slot 721 in the first annular groove 41 and the first annular touch the end face groove 41; an outer end of the horizontal portion 73 of the connecting sleeve 3 downwardly exposed to the outside,  the connecting sleeve 3 is fixed to the end surface of upward convex push member 8, the connecting sleeve 3 is fixed with a lower end surface of the shutter member 9, the shutter member 9 has two downwardly extending and spaced along the front and rear retaining wall 91, the lower end of stop wall 91 of each shutter member has an outwardly protruding point card 93, the respective rod sections I opened for two point card 93 snap into holes 11, the lowermost end of stop wall 91 is hidden within the bore 11; 8 having a bottom pusher and extending downwardly along the front and rear spaced two coupling studs 81, vertical connecting sleeve with a through-opening 3 through a connecting post 81 for two receptacles 31, having an upper shield 9 is provided along the longitudinal connecting wall 94, connecting wall 94 通过螺钉13与两个连接柱81的下端面螺纹连接；遮挡件的连接壁94上设有能相对连接壁94上下移动的过渡推块10，该过渡推块10的上移能触动自动解锁开关7，在伸缩梯塌缩并触抵到下级连接套3时，推动件8能与过渡推块10接触而带动过渡推块10上移，过渡推块10的上移触动的水平部73的外端而使自动解锁开关7转动，最终带动插销4横向内移解锁。 13 is connected by a screw threaded connection to the two lower end of the column 81; provided can move relative to the vertical wall 94 connected to a transition wall connecting the push block 10 on the shutter member 94, the push block 10 on the transitional shift can touch the unlocking switch automatically 7, contraction and extension ladder collapse from reaching to the lower connection sleeve 3, pushes the contact member 8 can push block and the transition 10 to drive the transition push block shift 10, the transition push block 10 is shifted touched horizontal portion outer 73 the terminal switch 7 is rotated automatically unlock, unlock the final drive shift laterally inner plug 4.  推动件8的内侧面81为自下而上向外倾斜的斜面，遮挡件的挡壁91的内侧面92为自上而下向外倾斜的斜面。  inner side surface of the pushing member 818 is inclined outwardly from bottom to top inclined surface, the shutter member 91 in the inner surface of the retaining wall 92 is outwardly inclined surface inclined from top to bottom.  本锁定结构的工作原理及过程如下。 The working principle and process  This locking structure is as follows.  如图4所示，锁定时，上一节节杆I上移，当移动到合适位置，即相邻两节节杆I上锁定孔11、12位于同一轴线上，插销4在弹簧5的作用下弹出，同时插入该两节节杆I的锁孔11、12内，将该两节节杆I锁定在一起。  As shown in FIG 4, when locked, a steadily move the rod I, when moved to the proper position, i.e. the two adjacent losing I bar locking holes 11 and 12 located on the same axis, the spring latch 4 5 under the action pop-up, while steadily inserted into the two rods 11 and 12 within keyhole I, the two I bar steadily locked together.  如图1〜3、8所示，当需要单节逐级解锁，则需从伸缩梯的上级锁定结构逐级往下级解锁，解锁时只需推动推扭6，推扭6带动插销4克服弹簧5的弹力横向朝内移动，插销4退出两节节杆I的锁孔11、12，解除伸缩梯相邻上下两节节杆I的锁定，上一节节杆I在重力的作用下下移。  FIG 1~3,8, when required to unlock a single step by step, level by level down level you need to unlock the locking structure from the upper extension ladder, simply pushing the push unlocking 6 twisted, pushing and twisting drive pin 6 4 against the force of the spring 5 is moved transversely inwardly, the latch lever 4 I steadily two exit keyhole 11 and 12, two vertically adjacent lift telescopic ladder steadily I bar locking lever steadily on a gravity acting I lower down.  如图1〜3、8所示，逐级自动解除上级锁定结构，先推动推扭6将下级横档2的锁定结构解锁后，其相邻的上级连接套3连同横档2在自重的作用下往下移，直至下级横档2的锁定结构中的推动件8插入遮挡件的挡壁91之间，推动过渡推块10上移，过渡推块10的上移触动的水平部73的外端而使自动解锁开关7转动，最终带动插销4横向内移解除该级横档2的锁定结构，以此类推，其能逐级解除上级横档2的锁定结构。  As shown, the upper locking is automatically released stepwise 1~3,8 structure, pushing the push twist to 6 after the lower rungs 2 unlock locking structure, adjacent the connecting sleeve 3 together with the upper rail 2 move down by its own weight until the lower pusher rail locking structure 2 in the shutter member 8 is inserted between a stop wall 91, facilitating the transition move the push block 10, the push block 10 on the transition of the horizontal portion of the touch shift the outer end 73 of the rotary switch is automatically unlocked 7, finally releasing the driven bolt 4 shift rungs transverse locking structure 2, so that the upper rail can progressively releasing the locking structure 2.  如图1所示，由于上下两级连接套之间通过挡壁91和推动件8的支撑，相邻上下两横档2之间形成安全间距X，自动解锁开关7藏于遮挡件的两挡壁91之间，推动件8与自动解锁开关7的接触在挡壁91之间完成，故当上级横档2连同连接套3下移至下级横档2时，手指不会被夹于推动件8与自动解锁开关7之间；而且推动件8和挡壁91的内端面81、92均为斜面，下移过程中斜面会将握在节杆上的手指向内推开，使手指位于上下两横档之间的安全间距内，有效防止夹手。  1, since the connection between the two sets of upper and lower safety distance X is formed between the support 2 by the retaining wall 91 and the pusher 8 of the adjacent upper and lower rungs, automatically unlock switch 7 hidden in the shutter member between two retaining wall 91, the pusher 8 in contact with the unlock switch 7 is automatically created between the stopper wall 91, so that when the upper rail 2 with the connecting sleeve 3 to move the lower rail 2, the finger is not caught 7 between the pushing and automatic unlocking switch 8; and pushing the end surface of the stopper member 8 and the walls 91 are inclined surfaces 81, 92, during the ramp down section of the rod will be held in the fingers inwardly pushed, so that finger is positioned within the safe distance between the upper and lower rungs, effectively prevent the clip hands.