WO2018129982A1 - 伸缩梯子的缓降机构 - Google Patents

伸缩梯子的缓降机构 Download PDF

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Publication number
WO2018129982A1
WO2018129982A1 PCT/CN2017/107585 CN2017107585W WO2018129982A1 WO 2018129982 A1 WO2018129982 A1 WO 2018129982A1 CN 2017107585 W CN2017107585 W CN 2017107585W WO 2018129982 A1 WO2018129982 A1 WO 2018129982A1
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WIPO (PCT)
Prior art keywords
ladder
tube
disposed
descending mechanism
lower sealing
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PCT/CN2017/107585
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English (en)
French (fr)
Inventor
潘跃进
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潘跃进
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Application filed by 潘跃进 filed Critical 潘跃进
Publication of WO2018129982A1 publication Critical patent/WO2018129982A1/zh

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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
    • 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
    • E06C1/38—Special constructions of ladders, e.g. ladders with more or less than two longitudinal members, ladders with movable rungs or other treads, longitudinally-foldable ladders
    • E06C1/383—Foldable ladders in which the longitudinal members are brought together on folding
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C7/00—Component parts, supporting parts, or accessories

Definitions

  • the utility model relates to a ladder, in particular to a descending mechanism of a telescopic ladder.
  • the telescopic ladder is a necessity for the climbing operation of the stretchable and retractable storage.
  • the retractable ladder is mostly disposed at the left and right ends of the second step of the lower part of the ladder.
  • the utility model provides a descending mechanism of the telescopic ladder which reduces the descending speed at the time of contraction and improves the safety performance.
  • a descending mechanism of a telescopic ladder comprising two vertically arranged ladder columns and a plurality of horizontally arranged steps, each of which is sleeved by a large to small pipe, the same
  • the step is disposed between the upper ends of the two tubes of the caliber, wherein the descending mechanism is disposed between the adjacent ladder column tubes, and the descending mechanism includes an upper sealing disc disposed in the tube.
  • the sealing disc is sealingly connected to the tube; a lower sealing disc is disposed in the adjacent lower tube, and the lower sealing disc is sealingly connected with the adjacent lower tube.
  • a vent hole is formed in the lower sealing disk.
  • vent hole includes a small hole in the bottom surface of the lower sealing disk and a notch on the side of the lower sealing disk.
  • the periphery of the upper sealing disk has a thinner, top-down tapered surface, the upper end of the inclined surface having a size greater than or equal to the inner dimension of the tube, and the upper sealing disk is closely attached to the inner wall of the tube At the lower end of each tube, a position of the end surface is radially provided with a ring-shaped inwardly extending limiting step; the periphery of the lower sealing disk also has a thin, cylindrical or tapered bevel.
  • the cylindrical surface or the inclined surface has a size greater than or equal to the inner dimension of the lower adjacent larger tube, and the lower sealing disk is in close contact with the inner wall of the larger tube.
  • a connecting plate is disposed between the upper sealing plate and the lower sealing plate, and the upper sealing plate is provided with a positioning rod, and the connecting plate is provided with a positioning through hole through which the positioning rod passes.
  • the sealing disc is provided with a positioning blind hole for inserting the positioning rod.
  • the technical idea of the utility model is as follows: the telescopic ladder for operating the shrink switch with the foot surface, because the shrink switch is operated by the foot surface, the hands can be lifted to support the higher position of the ladder, and the center of gravity of the ladder can be stably held, which is remarkable To avoid the safety hazard of the ladder falling due to the position of the supporting ladder being too low when the user bends down or knees down to operate the shrink switch, and further provides a slow-down technique that can make the ladder contraction and slow down. To further improve the safety of the ladder.
  • the beneficial effects of the utility model are mainly manifested in: effectively avoiding the safety hazard caused by the manual operation and improving the safety.
  • 1 is an appearance view of a contracted state and an extended state of an extension ladder, (a) being a contracted state, and (b) being an extended state;
  • Figure 2 is a structural exploded view of the descending mechanism
  • Figure 3 is a cross-sectional view showing the state structure during the contraction of the descending mechanism
  • Figure 4 is a partial enlarged view of A of Figure 3;
  • Figure 5 is a cross-sectional view showing the structure of the foot surface operation shrink switch
  • Figure 6 is a cross-sectional view showing the structure of the anti-misoperation safety device derived from the foot surface operation shrink switch on the basis of Figure 5;
  • Figure 7 is a partial enlarged view of Figure 6, (a) is not unlocked state, (b) is the state after the unlocking; (c) is the state when the ladder is contracted;
  • FIG. 8 is a schematic structural view of the foot operated shrink switch having the anti-misoperation design derived on the basis of FIG. 5.
  • a telescopic ladder includes two vertically arranged ladder columns and a plurality of horizontally arranged steps, each of which is sleeved by a large to small pipe, the same
  • the step is disposed between the upper ends of the two tubes of the caliber, and the descending mechanism is disposed between the adjacent ladder column tubes, and the descending mechanism includes an upper sealing disc disposed in the tube, the upper sealing disc A sealing joint is connected to the pipe; a lower sealing disk is disposed in the adjacent lower pipe, and the lower sealing disk is sealingly connected to the adjacent lower pipe, and the lower sealing disk is provided with a vent hole.
  • vent hole includes a small hole in the bottom surface of the lower sealing disk and a notch on the side of the lower sealing disk.
  • the periphery of the upper sealing disk has a thin, top-down tapered surface, and the upper end of the inclined surface has a size greater than or equal to the inner size of the tube, and the upper sealing disk Closely fitting with the inner wall of the tube; a ring-shaped inwardly extending limiting step is provided in the radial direction at the lower end of each tube; the periphery of the lower sealing disk also has a thin, cylindrical surface Or a tapered bevel having a size greater than or equal to an inner dimension of a lower adjacent larger tube, the lower sealing disk being in close contact with an inner wall of the larger tube.
  • a connecting plate is disposed between the upper sealing plate and the lower sealing plate, and the upper sealing plate is provided with a positioning rod, and the connecting plate is provided with a positioning through hole through which the positioning rod passes.
  • the sealing disc is provided with a positioning blind hole for inserting the positioning rod.
  • a foot surface contraction switch operated by a foot surface is disposed under the first step of the lower portion of the ladder, the foot surface contraction switch includes an operation rod, and an operation rubber pad is fixed on the operation rod, and the operation rod is
  • the transmission rod is in contact with a lower end of a transmission rod, and the upper end of the transmission rod is in contact with one end of a second step of the pin switch, and the other end of the pin switch is hinged to the middle of the pin by a round pin
  • a front end of the latch is engaged with a positioning hole of two ladder posts corresponding to the second step
  • a rear end of the plug is in contact with the return spring
  • the return spring is located in the latch seat, and the latch seat is fixed at Within the second cascade.
  • the telescopic ladder further includes an anti-misoperation insurance mechanism
  • the anti-misoperation insurance mechanism includes a safety block
  • the safety block is fixed on the operation rod
  • a safety switch is disposed outside the step
  • a fixed fuse box is provided, wherein the fuse box is provided with a slider, a safety spring, a flap and a torsion spring, wherein the safety switch is linked with the slider, and one end of the slider is in contact with the safety spring, the insurance
  • the other end of the spring is fixed in the fuse box, the other end of the slider is engaged with the blocking piece, the blocking piece is rotatably mounted on a fulcrum in the fuse box, and the torsion spring is mounted on the fulcrum at the sliding
  • the fuse box at the joint of the block and the baffle has a hole for the safety block to protrude; when the unlocking is not implemented, the insurance on the operating rod
  • the block is in contact with the slider through the hole formed in the bottom surface of the step; when the unlocking is
  • the telescopic ladder further includes an anti-misoperation mechanism
  • the anti-misoperation mechanism includes a bracket
  • the operating lever includes a left operating lever connected to the left ladder pillar and a right operating lever connected to the right ladder pillar.
  • An operating rubber pad is respectively mounted on the left operating lever and the right operating lever, a right end of the left operating lever is hinged to a lower left end of the bracket, and a left end of the right operating lever is hinged to a lower right end of the bracket, and the bracket is The upper part is fixed on the step.
  • the basic form of the contracted state and the extended state of the telescopic ladder of the present embodiment is as shown in the figure, including two vertically arranged ladder columns 1 and a plurality of horizontally disposed steps 2, each of which has a plurality of steps 1
  • the large and small tubes 1(1) to 1(n) are sleeved; the above is the conventional structure of the telescopic ladder.
  • the descending device is installed at the bottom end of each of the tubes 1 (2) to 1 (n) which are sleeved to form the ladder column.
  • an upper sealing disk 22 disposed in the lower portion of the tube.
  • the periphery of the upper sealing disk 22 has a thin, top-down tapered face, the upper end dimension d1 of which is the same as the inner dimension D1 of the tube. Or slightly larger, it can be closely adhered to the inner wall of the pipe; a ring-shaped inwardly extending limit step 23 is provided in the radial direction of the lower end of the pipe; the upper sealing disk 22 is loaded from the upper end of the pipe.
  • a lower sealing disk 24 is disposed outside the tube, and the periphery of the lower sealing disk 24 also has a thin, cylindrical or tapered inclined surface.
  • the dimension d2 of the cylindrical surface or the inclined surface is the same as or slightly larger than the inner dimension D2 of the larger tube in the connected pipe, and can closely fit the inner wall of the larger pipe; between the upper sealing disk 22 and the lower sealing disk 24 Have a lands 25; pass A screw 26 connects and fixes the lower sealing disk 24, the lands 25 and the upper sealing disk 22 at the lower end of each tube.
  • the ladder Since the upper sealing disk 22 is in close contact with the inner wall of the smaller pipe in the connection, and the lower sealing disk is in close contact with the inner wall of the larger pipe in the connection, the ladder is compressed by the two pipes when the contraction is lowered. The air between the air is slowly discharged from the small holes 27 and the notches 28 in the lower sealing disk, thereby achieving a slow descending effect of the ladder.
  • FIG. 5 is a cross-sectional view showing the structure of a foot operated shrink switch according to an embodiment of the present invention, including an operating lever 3 disposed under the step 2 (1) at the lower portion of the ladder, and an operating foot pad fixed in the middle of the operating rod 3. 4. Both ends of the operating lever 3 are in contact with the lower end of the transmission rod 5 provided in the ladder column 1 (1), and the upper end of the transmission rod 5 is in contact with the lower end of the latch switch 6 of the step 2 (2), and the latch switch 6 is simultaneously The lower end is also in contact with the outer surface of the ladder column 1 (1), and the upper end of the latch switch 6 is hinged to the latch 8 through the round pin 7.
  • the operating lever 3 When the user lifts the operating rubber pad 4 with the foot surface, the operating lever 3 simultaneously drives the transmission rod 5 for upward movement, the upper end of the transmission rod 5 is pressed against the pin switch 6 of the second step 2 (2), and the bolt 8 hinged with the pin switch 6 is then moved to the end of the spring 9 and is moved from the ladder column 1 ( 2) The upper positioning hole 10 is withdrawn, and the step 2 (3) and its associated ladder column 1 (2) are then contracted and lowered.
  • an anti-misoperation safety mechanism is provided on the basis of the structure illustrated in FIG. 5 of the embodiment of the present invention.
  • the specific implementation manner is that the safety block 13 is fixed on the operating rod 3 in the step. 2 (1) has a cutout 14 added to the outside of the step 2
  • the inside of (1) is provided with a fixed fuse box 15, which is provided with a slider 16, a spring 17, a blocking piece 18, and a torsion spring 19, wherein the safety switch 14 and the slider 16 are connected by a screw 20; (a), when unlocking is not performed, the safety block 13 on the operating lever 3 is in contact with the slider 16 through the hole 21 opened in the bottom surface of the step, and at this time, the operating lever 3 cannot move upward; see FIG.
  • the specific implementation manner is to divide one operating rod 3 described in FIG. 5 into two parts- - the operating lever 3 (1) and the operating lever 3 (2), on which the bracket 21 is fixed, the operating lever 3 (1) and the operating lever 3 (2) are mounted on the bracket 21 at one end of the middle line of the ladder And can be rotated, and the operation pad 3 (1) and the operation lever 3 (2) are fixed with an operation pad 4 (1) and an operation pad 4 (2) at one end of the ladder column 1.
  • the foot surface is used.
  • the operation pad 4 (1) and the operation pad 4 (2) are lifted up one by one, the action of contracting the ladder is completed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ladders (AREA)

Abstract

一种伸缩梯子的缓降机构，该伸缩梯子包括左右对称的两根纵向设置的梯柱（1）和若干根横向设置的梯级（2），每一根梯柱（1）都由由大到小的管子套接而成，相同口径的两根管子上端之间设置梯级（2），在相邻梯柱（1）管子之间设置缓降机构，缓降机构包括一个设在管子内的上密封盘（22），上密封盘（22）与管子密封连接；在相邻下方管子内设有下密封盘（24），下密封盘（24）与相邻下方管子密封连接，下密封盘（24）上开有泄气孔。该缓降机构能使伸缩梯子降低收缩时下降速度、提升安全性能。

Description

伸缩梯子的缓降机构 技术领域
本实用新型涉及梯子，尤其是一种伸缩梯子的缓降机构。
背景技术
伸缩梯子是一种可伸展使用、可收缩存放的爬高作业的必需品，当前技术中的伸缩梯子，其收缩开关大多设置在梯子下部第二根梯级的左右两端各一个，操作收缩开关时，需要使用者弯下腰，甚至蹲下身体去操作，很容易造成因使用者扶持梯子的位置太低致使梯子倾倒，轻则损坏梯子，重则伤及自己和旁人；而且，在现有技术中的伸缩梯子收缩时下降速度很快，用手操作收缩开关时，使用者的手很容易因避闪不及而被砸伤。因此现有的伸缩梯技术，还可作进一步的改进。
发明内容
为了克服已有伸缩梯使用时收缩时下降速度过快、用手操作收缩开关存在安全隐患的不足，本实用新型提供一种降低收缩时下降速度、提升安全性能的伸缩梯子的缓降机构。
本实用新型解决其技术问题所采用的技术方案是：
一种伸缩梯子的缓降机构，该伸缩梯子包括左右对称的两根纵向设置的梯柱和若干根横向设置的梯级，每一根梯柱都由由大到小的管子套接而成，相同口径的两根管子上端之间设置所述梯级，其特征在于：在相邻梯柱管子之间设置所述缓降机构，所述缓降机构包括一个设在管子内的上密封盘，所述上密封盘与所述管子密封连接；在相邻下方管子内设有下密封盘，所述下密封盘与相邻下方管子密封连接， 所述下密封盘上开有泄气孔。
进一步，所述泄气孔包括下密封盘底面的小孔和下密封盘的侧边的缺口。
再进一步，所述上密封盘的周边有一圈较薄的、自上而下呈锥形的斜面，所述斜面的上端尺寸大于等于管子的内尺寸，所述上密封盘与管子的内壁紧密贴合；在每支管子的下端靠端面的位置在径向设有一圈向内凸起的限位台阶；所述下密封盘的周边同样有一圈较薄的、呈圆柱面或锥形的斜面，所述圆柱面或斜面的尺寸大于等于下部相邻的较大管子的内尺寸，所述下密封盘与所述较大管子的内壁紧密贴合。
更进一步，在上密封盘与下密封盘之间设有一个连接盘，所述上密封盘上设有定位杆，所述连接盘上设有供所述定位杆穿过的定位通孔，所述下密封盘上设有供所述定位杆插入的定位盲孔。
本实用新型的技术构思为：用脚面操作收缩开关的伸缩梯，因在用脚面操作收缩开关的同时，可腾出双手扶持在梯子较高的位置，能很稳定地把持住梯子的重心，显著地避免使用者弯下腰或蹲下身体用手去操作收缩开关时，因扶持梯子的位置太低致使梯子倾倒的安全隐患；并进一步提供一种能使梯子收缩下降速度变得缓慢的缓降技术，使梯子的安全性进一步得到提升。
本实用新型的有益效果主要表现在：有效避免用手操作带来的安全隐患、提升安全性。
附图说明
图1为伸缩梯的收缩状态和伸展状态的外观形态图，(a)是收缩状态，(b)是伸展状态；
图2为缓降机构的结构爆炸图；
图3是缓降机构的收缩过程中的状态结构剖视图；
图4是图3的A处局部放大图；
图5为脚面操作收缩开关的结构剖视图；
图6为脚面操作收缩开关在图5的基础上衍生的增加了防误操作保险装置的结构剖视图；
图7为图6的局部放大图，(a)为未实施解锁状态，(b)为实施解锁后的状态；(c)为收缩梯子时的状态；
图8为脚面操作收缩开关在图5的基础上衍生的有防误操作设计的结构示意图。
具体实施方式
下面结合附图对本实用新型作进一步描述。
参照图1～图8，一种伸缩梯子，包括左右对称的两根纵向设置的梯柱和若干根横向设置的梯级，每一根梯柱都由由大到小的管子套接而成，相同口径的两根管子上端之间设置所述梯级，在相邻梯柱管子之间设置所述缓降机构，所述缓降机构包括一个设在管子内的上密封盘，所述上密封盘与所述管子密封连接；在相邻下方管子内设有下密封盘，所述下密封盘与相邻下方管子密封连接，所述下密封盘上开有泄气孔。
进一步，所述泄气孔包括下密封盘底面的小孔和下密封盘的侧边的缺口。
再进一步，所述上密封盘的周边有一圈较薄的、自上而下呈锥形的斜面，所述斜面的上端尺寸大于等于管子的内尺寸，所述上密封盘 与管子的内壁紧密贴合；在每支管子的下端靠端面的位置在径向设有一圈向内凸起的限位台阶；所述下密封盘的周边同样有一圈较薄的、呈圆柱面或锥形的斜面，所述圆柱面或斜面的尺寸大于等于下部相邻的较大管子的内尺寸，所述下密封盘与所述较大管子的内壁紧密贴合。
更进一步，在上密封盘与下密封盘之间设有一个连接盘，所述上密封盘上设有定位杆，所述连接盘上设有供所述定位杆穿过的定位通孔，所述下密封盘上设有供所述定位杆插入的定位盲孔。
本实施例的伸缩梯子，在梯子下部的第一根梯级下面设有用脚面操作的脚面收缩开关，所述脚面收缩开关包括有操作杆，所述操作杆上固定有操作胶垫，所述操作杆的两端各与一根传动杆的下端接触，所述传动杆的上端则与第二根梯级的插销开关的一端接触，所述插销开关的另一端则通过一支圆销铰接在插销的中部，所述插销的前端与第二根梯级对应的两个梯柱的定位孔配合，所述插销的后端顶触在复位弹簧上，所述复位弹簧位于插销座内，所述插销座固定在第二根梯级内。
进一步，所述伸缩梯子还包括防误操作保险机构，所述防误操作保险机构包括保险块，在所述操作杆上固定所述保险块，在梯级的外面设置保险开关，在所述梯级内设有固定的保险盒，所述保险盒内设有滑块、保险弹簧、挡片和扭力弹簧，其中保险开关与滑块联动，所述滑块的一端顶触在保险弹簧上，所述保险弹簧的另一端固定在保险盒内，所述滑块的另一端与挡片配合，所述挡片可转动地安装在保险盒内的支点上，所述支点上安装扭力弹簧，在所述滑块与挡片配合处的保险盒开有供保险块伸入的孔；在未实施解锁时，操作杆上的保险 块通过梯级底面开设的孔抵触在滑块上；实施解锁时，保险开关带动滑块动作，挡片随即依靠扭力弹簧的扭力转动，从而抵住滑块不能往回运动，操作杆带动保险块向上运动推动挡片转动。
再进一步，所述伸缩梯子还包括防误操作机构，所述防误操作机构包括支架，所述操作杆包括与左侧梯柱连接的左操作杆和与右侧梯柱连接的右操作杆，所述左操作杆和右操作杆上分别安装操作胶垫，所述左操作杆的右端与所述支架下部左端铰接，所述右操作杆的左端与所述支架下部右端铰接，所述支架的上部固定在梯级上。
本实施例的伸缩梯子的收缩状态和伸展状态的基本形态图如图所示，包括左右对称的两根纵向设置的梯柱1，若干根横向设置的梯级2，每根梯柱1都由若干支由大到小的管子1(1)～1(n)套接而成；以上为伸缩梯子的常规结构。
参见图2～图4，是本实用新型实施例的缓降机构的剖视图，该缓降装置安装在套接组成梯柱的每支管子1(2)～1(n)的底端各一套，包括一个设在管子下部内的上密封盘22，上密封盘22的周边有一圈较薄的、自上而下呈锥形的斜面，所述斜面的上端尺寸d1与管子的内尺寸D1相同或略大，可与管子的内壁紧密贴合；在管子的下部靠端面的位置在径向设有一圈向内凸起的限位台阶23；上密封盘22从管子的上端装入，当上密封盘22的下端抵靠在限位台阶23上时停止，在管子外设有下密封盘24，下密封盘24的周边同样有一圈较薄的、呈圆柱面或锥形的斜面，所述圆柱面或斜面的尺寸d2与相连管子中的较大管子的内尺寸D2相同或略大，可与所述较大管子的内壁紧密贴合；在上密封盘22与下密封盘24之间设有一个连接盘25；通过 螺丝26将下密封盘24、连接盘25和上密封盘22连接并固定在每支管子的下端。因上密封盘22与相连中的较小的管子的内壁紧密贴合，而下密封盘又与相连中的较大的管子内壁紧密贴合，所以梯子在收缩下降时，通过压缩两根管子之间的空气从下密封盘中的小孔27和缺口28缓慢排出，从而达到梯子缓慢下降的效果。
参见图5，为本实用新型实施例的脚面操作收缩开关的结构剖视图，包括在梯子下部的梯级2(1)的下面设有一根操作杆3，在操作杆3的中部固定有一个操作脚垫4，操作杆3的两端与设在梯柱1(1)内的传动杆5的下端接触，传动杆5的上端与梯级2(2)的插销开关6的下端接触，同时该插销开关6的下端也与梯柱1(1)的外表面接触，插销开关6的上端则通过圆销7与插销8铰接，当使用者用脚面将操作胶垫4向上提，操作杆3同时带动传动杆5作向上运动，传动杆5的上端通过顶压第二根梯级2(2)的插销开关6，与插销开关6铰接的插销8随即向其设有弹簧9的一端运动并从梯柱1(2)上的定位孔10中退出，梯级2(3)及其相关联的梯柱1(2)则随即收缩降下。当这些动作完成及移除了脚面在操作胶垫4的向上提的动作后，因在传动杆5内设有弹簧11，弹簧11的一端抵触在传动杆5上，另一端则抵触在固定在梯柱1(2)的弹簧支座12上，当移除了脚面在操作胶垫4的向上提的动作后，传动杆5将借助弹簧11的压力使传动杆3回落复位，即完成了一次收缩梯子的动作。
参见图6和图7，是在本实用新型实施例图5所述的结构基础上衍生的增加了防误操作保险机构，其具体实施方式是在操作杆3上固定了保险块13，在梯级2(1)的外面增加了保险开关14，在梯级2 (1)的里面设有固定的保险盒15，保险盒15内设有滑块16、弹簧17、挡片18、扭力弹簧19，其中保险开关14与滑块16通过螺丝20相连；参见图7(a)，在未实施解锁时，操作杆3上的保险块13通过梯级底面开设的孔21抵触在滑块16上，此时，操作杆3无法作向上运动；参见图7(b)，当梯子使用后依靠在墙壁上时，先将保险开关14如箭头1方向拔，同时带动滑块16如箭头2方向运动，挡片18随即依靠扭力弹簧19的扭力如箭头3方向转动，从而抵住滑块16不能往回运动，此时，没有滑块16的抵挡，操作杆3可以向上运动了；参见图7(c)，此时，用脚面使操作杆3如箭头4的方向运动，梯子随即完成图5所述的梯子收缩动作；同时，固定在操作杆3上的保险块13则使挡片18如箭头5方向转动，此时，滑块16没有了挡片18的抵挡，滑块16随即依靠弹簧17的作用迅速如箭头6方向运动，又复原到图7(a)的状态，即完成了一次收缩梯子的动作。
参见图8，是在本实用新型实施例图5所述的结构基础上衍生的防误操作机构，其具体实施方式是将实施例图5中所述的一根操作杆3分为二根——操作杆3(1)和操作杆3(2)，在梯级2(1)上固定有支架21，操作杆3(1)和操作杆3(2)靠梯子中线的一端安装在支架21上，并可以转动，在操作杆3(1)和操作杆3(2)靠梯柱1的一端固定有操作胶垫4(1)和操作胶垫4(2)，梯子需要收缩时，用脚面在操作胶垫4(1)和操作胶垫4(2)各向上提一次，即完成了一次收缩梯子的动作。

Claims (4)

  1. 一种伸缩梯子的缓降机构，该伸缩梯子包括左右对称的两根纵向设置的梯柱和若干根横向设置的梯级，每一根梯柱都由由大到小的管子套接而成，相同口径的两根管子上端之间设置所述梯级，其特征在于：在相邻梯柱管子之间设置所述缓降机构，所述缓降机构包括一个设在管子内的上密封盘，所述上密封盘与所述管子密封连接；在相邻下方管子内设有下密封盘，所述下密封盘与相邻下方管子密封连接，所述下密封盘上开有泄气孔。
  2. 如权利要求1所述的伸缩梯子的缓降机构，其特征在于：所述泄气孔包括下密封盘底面的小孔和下密封盘的侧边的缺口。
  3. 如权利要求1或2所述的伸缩梯子的缓降机构，其特征在于：所述上密封盘的周边有一圈较薄的、自上而下呈锥形的斜面，所述斜面的上端尺寸大于等于管子的内尺寸，所述上密封盘与管子的内壁紧密贴合；在每支管子的下端靠端面的位置在径向设有一圈向内凸起的限位台阶；所述下密封盘的周边同样有一圈较薄的、呈圆柱面或锥形的斜面，所述圆柱面或斜面的尺寸大于等于下部相邻的较大管子的内尺寸，所述下密封盘与所述较大管子的内壁紧密贴合。
  4. 如权利要求1或2所述的伸缩梯子的缓降机构，其特征在于：在上密封盘与下密封盘之间设有一个连接盘，所述上密封盘上设有定位杆，所述连接盘上设有供所述定位杆穿过的定位通孔，所述下密封盘上设有供所述定位杆插入的定位盲孔。
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