JP2009287220A - Multi-stage ladder - Google Patents

Multi-stage ladder Download PDF

Info

Publication number
JP2009287220A
JP2009287220A JP2008138788A JP2008138788A JP2009287220A JP 2009287220 A JP2009287220 A JP 2009287220A JP 2008138788 A JP2008138788 A JP 2008138788A JP 2008138788 A JP2008138788 A JP 2008138788A JP 2009287220 A JP2009287220 A JP 2009287220A
Authority
JP
Japan
Prior art keywords
ladder
ladder body
extension
stage
operated
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.)
Granted
Application number
JP2008138788A
Other languages
Japanese (ja)
Other versions
JP5096229B2 (en
Inventor
Kimiyo Nakao
紀美代 中尾
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to JP2008138788A priority Critical patent/JP5096229B2/en
Publication of JP2009287220A publication Critical patent/JP2009287220A/en
Application granted granted Critical
Publication of JP5096229B2 publication Critical patent/JP5096229B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Ladders (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multi-stage ladder having usability and extremely high safety. <P>SOLUTION: This extensible multi-stage ladder includes a lower stage ladder body and a plurality of ladder bodies for extension which have respective pairs of right and left column members and which are combined in such a manner that the column members are extensible and an operation rope for extensively operating the ladder bodies for extension. The ladder includes an operation order restriction means which restricts the operation when the ladder bodies for extension are extended and retracted by operating the operation rope in such a manner that, when extending, the uppermost ladder body is first operated and the lower ladder bodies are operated and extended in order, and that, when retracting, the lowermost ladder body is first operated and the upper ladder bodies are operated and retracted in order. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

この発明は、伸縮自在な多段梯子に関する。   The present invention relates to a retractable multistage ladder.

従来、高所に移動する場合、あるいは電線などの架線工事やその修理工事などを行う場合、必要な高さに調整可能な多段梯子を用いることが多い。かかる多段梯子の一例として、それぞれ左右一対の柱部材を有し、柱部材同士が伸縮自在に組み合わせられた下段梯子体及び複数の伸長用梯子体と、前記伸長用梯子体を伸縮操作するための操作綱とを備えたものがあり、1本の操作綱を用いて、複数の伸長用梯子体を伸縮操作可能としたものがある(例えば、特許文献1を参照。)。   Conventionally, when moving to a high place, or when performing overhead work such as electric wires or repair work thereof, a multistage ladder that can be adjusted to a required height is often used. As an example of such a multi-stage ladder, each has a pair of left and right column members, and a lower-stage ladder body and a plurality of extension ladder bodies in which the column members are stretchably combined with each other, and an extension operation of the extension ladder body There is one provided with an operation rope, and there is one in which a plurality of ladders for extension can be extended and contracted using one operation rope (see, for example, Patent Document 1).

特許文献1に記載の多段梯子は、それぞれ踏桟を所定間隔で設けた下段梯子、中段梯子及び上段梯子よりなる3段梯子となっており、下段梯子内に中段梯子、中段梯子内に上段梯子を順次摺動自在に嵌挿している。   The multi-stage ladder described in Patent Document 1 is a three-stage ladder including a lower ladder, a middle ladder, and an upper ladder, each having a predetermined number of steps, and the middle ladder and the upper ladder in the middle ladder. Are inserted slidably in sequence.

そして、下段梯子の先端部に第1の滑車、中段梯子の先後端部に第2、第3の滑車をそれぞれ回転自在に装設し、梯子繰出用の操作綱を下段梯子の先端部の第1の滑車に纏掛した後、中段梯子の後端部の第2の滑車に纏掛し、更に中段梯子の先端部の第3の滑車に纏掛した後、先端を上段梯子の後端部に止着して、前記操作綱を引張ると、先ず上段梯子が繰出され、次いで中段梯子が繰出されるように構成されている。こうして、この3段梯子は伸長することになる。   A first pulley is installed at the tip of the lower ladder, and second and third pulleys are rotatably installed at the front and rear ends of the middle ladder, respectively, and an operation rope for feeding the ladder is provided at the tip of the lower ladder. After wrapping around one pulley, wrap around the second pulley at the rear end of the middle ladder, and further wrap around the third pulley at the leading end of the middle ladder, then the tip is the rear end of the upper ladder. When the operation rope is pulled down and pulled, the upper ladder is first drawn out, and then the middle ladder is drawn out. Thus, the three-stage ladder is extended.

一方、操作綱を弛めると、中段梯子が自重によって退入され、次いで上段梯子が自重によって退入されることになるため、この多段梯子は短縮することになる。
実開平6−4298号公報
On the other hand, if the operating rope is loosened, the middle ladder is retracted by its own weight, and then the upper ladder is retracted by its own weight, so this multi-stage ladder is shortened.
Japanese Utility Model Publication No. 6-4298

上述したように、1本の操作綱の操作で、先ず上段梯子が繰出され、次いで中段梯子が繰出される構成は操作性が良好であるものの、3段梯子を短縮する場合に、上述したように操作綱を弛めて中段梯子や上段梯子の自重によって退入する構成、すなわち、自重により落下させて退入させる構成とした場合、以下のような課題が生じることが分かった。   As described above, the operation in which the upper ladder is first drawn out and then the middle ladder is drawn out by the operation of the single rope, the operability is good, but when the three-stage ladder is shortened, as described above. It has been found that the following problems occur when the operation rope is loosened and the middle ladder or the upper ladder is retracted by its own weight, that is, it is dropped and retracted by its own weight.

すなわち、上段梯子を伸ばし、さらに中段梯子を伸ばして梯子全体を所定長さに伸長させようとした場合、所定長さに達すると、先ず中段梯子の止め金具を下段梯子の踏桟に係合させ、次いで上段梯子の止め金具を中段梯子の踏桟に係合させる手順となるが、中段梯子の止め金具を下段梯子の踏桟に係合させた際に、うっかり操作綱から手を離してしまうと、上段梯子が中段梯子の下端部まで落下してしまうおそれがあった。   In other words, when the upper ladder is extended and the middle ladder is extended to extend the entire ladder to a predetermined length, when the predetermined length is reached, first, the stopper of the middle ladder is first engaged with the lower ladder. Next, the procedure is to engage the stopper of the upper ladder with the step ladder of the middle ladder. However, when the stopper of the middle ladder is engaged with the step ladder of the lower ladder, the hand is inadvertently released from the operating rope. Then, the upper ladder may fall to the lower end of the middle ladder.

また、例えば、上段梯子、あるいは中段梯子の柱部材が変形したり、両者の間に異物が挟まったりした場合、上段梯子と中段梯子との間の摩擦力が増大し、伸長操作するときに操作力が重くなる場合がある。そのようなときに、無理やり上段梯子を伸ばそうとすると、上段梯子を重合させた状態のまま中段梯子が先に伸び、途中何らかの拍子に前記異物が抜け落ちたり、変形による摩擦力が解消されたりすると、上段梯子が急に伸び出し、中段梯子は反対に落下したりすることがある。   In addition, for example, if the upper ladder or the pillar member of the middle ladder is deformed, or if a foreign object is caught between the two, the frictional force between the upper ladder and the middle ladder increases, and the operation is performed when the extension operation is performed. The power may be heavy. In such a case, if the upper ladder is forcibly extended, the middle ladder is stretched first in a state where the upper ladder is polymerized, and the foreign matter falls off in some time, or the frictional force due to deformation is eliminated. The upper ladder may suddenly extend, and the middle ladder may fall in the opposite direction.

さらに、例えば、下段梯子、あるいは中段梯子の柱部材が変形したり、両者の間に異物が挟まったりした場合、上段梯子を伸長させた後に中段梯子を伸長させようとすると、下梯子と中段梯子との間の摩擦力が増大して、操作力が重くなる場合がある。そのような状態のときに、3段梯子を縮めようとした場合、途中何らかの拍子に前記異物が抜け落ちたり、変形による摩擦力が解消されたりすると、中段梯子が急に落下する一方、上段梯子が伸長することがある。   Furthermore, for example, when a pillar member of the lower ladder or the middle ladder is deformed or a foreign object is caught between the two, if the middle ladder is extended after the upper ladder is extended, the lower ladder and the middle ladder In some cases, the frictional force increases between the two and the operation force becomes heavier. In such a state, when trying to shrink the three-stage ladder, if the foreign matter falls off somewhere in the middle or the frictional force due to deformation is eliminated, the middle ladder will suddenly fall, while the upper ladder will May stretch.

本発明は、上述したように、極めて操作性が良好のような構成でも、場合によっては危険を伴う操作となる多段梯子の安全性を高めた多段梯子を提供することを目的としている。   As described above, an object of the present invention is to provide a multi-stage ladder that improves the safety of the multi-stage ladder that is a potentially dangerous operation even in a configuration with extremely good operability.

(1)上記課題を解決するために、本発明では、それぞれ左右一対の柱部材を有し、柱部材同士が伸縮自在に組み合わせられた下段梯子体及び複数の伸長用梯子体と、前記伸長用梯子体を伸縮操作するための操作綱と、を備えた伸縮自在の多段梯子において、前記操作綱を操作して前記複数の伸長用梯子体を伸縮動作させる際に、伸長時には最上位の伸長用梯子体が初めに作動し、その後下位側が順次作動して伸長するように規制するとともに、収縮時には、最下位の伸長用梯子体が初めに作動して、その後、上位側が順次作動して収縮するように規制する作動順規制手段を備える多段梯子とした。   (1) In order to solve the above-described problem, in the present invention, a lower ladder body and a plurality of elongating ladder bodies each having a pair of left and right column members, in which the column members are stretchably combined, and the elongating ladder In a telescopic multi-stage ladder provided with an operation rope for extending and retracting the ladder body, when operating the operation rope to extend and retract the plurality of extension ladder bodies, The ladder body is operated first, and then the lower side is sequentially operated and restricted so as to be extended. At the time of contraction, the lowest extension ladder is operated first, and then the upper side is sequentially operated and contracted. In this way, a multi-stage ladder provided with operation order restricting means for restricting as described above was adopted.

(2)本発明は、上記(1)に記載の多段梯子において、前記伸長用梯子体を、中段梯子体と上段梯子体とから構成し、全ての梯子体の柱部材が重合状態となる初期状態から、前記操作綱を操作して前記伸長用梯子体を伸長させる際に、前記作動順規制手段は、前記上段梯子体が初めに作動して伸び切った後、前記中段梯子体を伸長させ、前記操作綱を操作して前記伸長用梯子体を収縮させる際には、前記中段梯子体が初めに作動して下段梯子体と重合状態になった後、前記上段梯子体を作動して前記初期状態に復帰させることを特徴とする。   (2) The present invention provides the multi-stage ladder described in (1) above, wherein the extension ladder is composed of an intermediate ladder and an upper ladder, and the column members of all the ladders are in an initial state in a superposed state. When the operation ladder is operated to extend the extension ladder body from the state, the operation order restricting means extends the middle ladder body after the upper ladder body is first operated and extended. When the operation ladder is operated to contract the extension ladder, the middle ladder is first operated to be in a superposed state with the lower ladder, and then the upper ladder is operated to operate the upper ladder. It is characterized by returning to the initial state.

(3)本発明は、上記(1)又は(2)に記載の多段梯子において、前記作動順規制手段は、前記伸長用梯子体の下位側梯子体の柱部材の上部に、スライド自在に遊嵌された作動ピンと、前記伸長用梯子体の上位側梯子体の柱部材の下部に設けられ、前記作動ピンを梯子内側にスライドさせる第1のカム部材と、前記下段梯子体の柱部材の上部に設けられ、前記作動ピンを梯子外側にスライドさせる第2のカム部材と、前記第2のカム部材を収納した状態で前記下段梯子体の柱部材の上部に設けられ、当該第2のカム部材により梯子外側にスライドされた前記作動ピンを係止するロック部材と、を備えることを特徴とする。   (3) The present invention provides the multi-stage ladder according to the above (1) or (2), wherein the operation order restricting means is slidably movable on an upper part of a pillar member of a lower ladder body of the extension ladder body. An operating pin that is fitted, a first cam member that is provided at a lower part of a pillar member of the upper ladder body of the extension ladder body, and that slides the operating pin to the inside of the ladder; and an upper part of the pillar member of the lower ladder body A second cam member that slides the operating pin to the outside of the ladder, and a second cam member that is provided above the pillar member of the lower ladder body in a state in which the second cam member is housed. And a locking member for locking the operating pin slid to the outside of the ladder.

この発明によれば、下段梯子体及び複数の伸長用梯子体からなる多段梯子における梯子体の伸長順番、収縮順番が明確に規制されるため、多段梯子の伸縮操作時に、想定外の梯子体が落下したり伸長したりするという不具合を確実に防止して、安全性を著しく高めることが可能となる。   According to the present invention, since the extension order and contraction order of the ladder body in the multi-stage ladder composed of the lower ladder body and the plurality of extension ladder bodies are clearly regulated, an unexpected ladder body is not expected during the expansion / contraction operation of the multi-stage ladder. It is possible to reliably prevent the problem of dropping or extending and to significantly increase safety.

本実施形態に係る多段梯子は、それぞれ左右一対の柱部材を有し、柱部材同士が伸縮自在に組み合わせられた下段梯子体及び複数の伸長用梯子体と、前記伸長用梯子体を伸縮操作するための操作綱と、を備えた伸縮自在の多段梯子において、前記操作綱を操作して前記複数の伸長用梯子体を伸縮動作させる際に、伸長時には最上位の伸長用梯子体が初めに作動し、その後下位側が順次作動して伸長するように規制するとともに、収縮時には、最下位の伸長用梯子体が初めに作動して、その後、上位側が順次作動して収縮するように規制する作動順規制手段を備えたものである。なお、各柱部材は、それぞれフランジ部とウェブ部とを有する断面視略コ字状に形成して、下段梯子体の柱部材を外側として入れ子状に組み合わせて伸縮自在に構成することができる。また、各柱部材をパイプ状に形成して、互いに重合状態に取り付けて伸縮自在に構成してもよい。   The multi-stage ladder according to the present embodiment has a pair of left and right pillar members, and a lower ladder body and a plurality of extension ladder bodies in which the pillar members are combined in an extendable manner, and an extension operation of the extension ladder body. In a telescopic multi-stage ladder provided with an operation rope for the operation, when the operation rope is operated to extend and retract the plurality of extension ladder bodies, the uppermost extension ladder body is activated first at the time of extension. After that, the lower order side is controlled so that it is operated and extended, and at the time of contraction, the lowest order extension ladder is operated first, and then the upper order is operated so that it is controlled so as to contract. It is equipped with regulation means. In addition, each pillar member can be formed in a substantially U-shape in cross-sectional view having a flange portion and a web portion, and can be configured to be stretchable by combining the pillar members of the lower ladder body in a nested manner. Further, each column member may be formed in a pipe shape and attached to each other in a superposed state so as to be stretchable.

本実施形態では、伸長用梯子体を、中段梯子体と上段梯子体とから構成した3段梯子として説明する。図1は本実施形態に係る多段梯子1である3段梯子の作動説明図であり、11は下段梯子体、21は中段梯子体、31は上段梯子体であり、これら中段梯子体21と上段梯子体31とから伸長用梯子体が構成される。   In this embodiment, the extension ladder body is described as a three-stage ladder composed of an intermediate ladder body and an upper ladder body. FIG. 1 is an operation explanatory diagram of a three-stage ladder which is a multi-stage ladder 1 according to the present embodiment, 11 is a lower ladder body, 21 is a middle ladder body, and 31 is an upper ladder body. The ladder body 31 is formed from the ladder body 31.

図示するように、下段梯子体11から伸長用梯子体の上段梯子体31にかけて1本の操作綱6が滑車71〜74を介して掛け渡されており、図1(a)に示す収縮状態から操作綱6を引張り操作することで、図1(b)に示すように、上段梯子体31と中段梯子体21とが伸び、所望の高さ位置でこれを保持することができるようにしている。このとき、本実施形態では、先ず、上段梯子体31が必ず初めに作動して伸び、次いで、中段梯子体21が伸びるように、後に詳述する作動順規制手段によって規制している。   As shown in the drawing, one operation rope 6 is stretched through pulleys 71 to 74 from the lower ladder body 11 to the upper ladder body 31 of the extension ladder body, and from the contracted state shown in FIG. By pulling the operation rope 6, as shown in FIG. 1 (b), the upper ladder body 31 and the middle ladder body 21 are stretched and can be held at a desired height position. . At this time, in the present embodiment, first, the upper ladder body 31 is always firstly operated and extended, and then the middle ladder body 21 is extended by the operation order restricting means described in detail later.

また、この作動順規制手段は、図1(b)に示す伸長状態から図1(a)に示す収縮状態へ収縮させる場合は、伸長時とは反対に、中段梯子体21が初めに作動して下降していき、その後、上段梯子体31が下降して多段梯子1の全体が収縮するように規制する。   Further, in the case where the operation order regulating means is contracted from the extended state shown in FIG. 1 (b) to the contracted state shown in FIG. 1 (a), the middle ladder body 21 is operated first, contrary to the extension time. After that, the upper ladder body 31 is lowered so that the entire multistage ladder 1 is contracted.

すなわち、図1(a)に示す収縮状態を初期状態とすれば、前記作動順規制手段は、上段梯子体31が初めに作動して伸び切った後、中段梯子体21を伸長させ、操作綱6を操作してこれらを収縮させる際には、中段梯子体21が初めに作動して下段梯子体11と重合状態になった後、上段梯子体31を作動して初期状態に復帰させるのである。   That is, assuming that the contracted state shown in FIG. 1A is an initial state, the operation order restricting means expands the middle ladder body 21 after the upper ladder body 31 is first actuated and extended, thereby operating the operation rope. When these are contracted by operating 6, the upper ladder body 31 is actuated to return to the initial state after the middle ladder body 21 is first actuated to be superposed with the lower ladder body 11. .

本実施形態に係る作動順規制手段は、図4〜図9を参照しながら後に詳述するが、伸長用梯子の下位側梯子体である中段梯子体21の柱部材22の上部に、スライド自在に遊嵌された作動ピン50と、前記伸長用梯子の上位側梯子体である上段梯子体31の柱部材32の下部に設けられ、前記作動ピン50を梯子内側にスライドさせる第1のカム部材51と、前記下段梯子体11の柱部材12の上部に設けられ、前記作動ピン50を梯子外側にスライドさせる第2のカム部材52と、前記第2のカム部材52を収納した状態で前記下段梯子体11の柱部材12の上部に設けられ、当該第2のカム部材52により梯子外側にスライドされた前記作動ピン50を係止するロック部材53を備える構成としている。   The operation order restricting means according to the present embodiment will be described in detail later with reference to FIGS. 4 to 9, but is slidable on the upper part of the column member 22 of the middle ladder 21 that is the lower ladder of the extension ladder. And a first cam member that is provided below the pillar member 32 of the upper ladder 31 that is the upper ladder of the extension ladder and that slides the actuation pin 50 to the inside of the ladder. 51, a second cam member 52 provided above the pillar member 12 of the lower ladder body 11 and sliding the operating pin 50 to the outside of the ladder, and the lower stage in a state in which the second cam member 52 is housed. A lock member 53 is provided on an upper portion of the pillar member 12 of the ladder body 11 and locks the operating pin 50 slid to the outside of the ladder by the second cam member 52.

かかる作動順規制手段を設けたことにより、初期状態(図1(a)の状態)では、中段梯子体21は下段梯子体11にロックされた状態となるため、操作綱6を引張り操作したときに、上段梯子体31よりも先に上昇することは決してない。たとえ、上段梯子体31と中段梯子体21の各柱部材32,22が変形したり、両者の間に異物が挟まったりした場合などのように、何らかの理由で両者が密着状態になっていて、作動させるための負荷が大きくても、必ず上段梯子体31が先に伸びることになる。   By providing such an operation order restricting means, in the initial state (the state of FIG. 1A), the middle ladder body 21 is locked to the lower ladder body 11, so that when the manipulation rope 6 is pulled. In addition, it never rises before the upper ladder body 31. For example, when the pillar members 32 and 22 of the upper ladder body 31 and the middle ladder body 21 are deformed or foreign matter is sandwiched between them, both are in close contact with each other, Even if the load for operation is large, the upper ladder 31 always extends first.

また、上段梯子体31を伸ばし、さらに中段梯子体21を下段梯子体11よりも1段以上伸ばしたときに、この中段梯子体21を下段梯子体11にロックして、うっかりそのまま操作綱6から手を離してしまっても、上段梯子体31は作動ピン50の端部に当たるために中段梯子体21の下端部まで落下するおそれがない。なお、ここで中段梯子体21を下段梯子体11よりも1段以上伸ばしたときというのは、一の踏桟から次の踏桟までの長さを伸長させたことを指す。   Further, when the upper ladder body 31 is extended and the middle ladder body 21 is further extended by one or more steps than the lower ladder body 11, the middle ladder body 21 is locked to the lower ladder body 11, and the operation ladder 6 is inadvertently left as it is. Even if the hands are released, the upper ladder body 31 hits the end of the operating pin 50, so there is no possibility of dropping to the lower end of the middle ladder body 21. Here, when the middle ladder body 21 is extended by one or more steps than the lower ladder body 11, it means that the length from one step rail to the next step rail is extended.

また、下段梯子体11、あるいは中段梯子体21の柱部材12,22が変形したり、両者の間に異物が挟まったりした場合でも、中段梯子体21が急に落下し、上段梯子体31は伸長したりするといった不具合も解消できる。   Further, even if the lower ladder body 11 or the column members 12 and 22 of the middle ladder body 21 are deformed or a foreign object is caught between them, the middle ladder body 21 suddenly falls, and the upper ladder body 31 is Problems such as expansion can be solved.

なお、作動ピン50については、梯子外側、梯子内側にそれぞれスライドするが、このスライドした位置で留まることができるように、作動ピン50に当接するゴム片や板バネなどの弾性体を当接自在に設けておくことが好ましい。   The operating pin 50 slides on the outside of the ladder and on the inside of the ladder, respectively, but an elastic body such as a rubber piece or a leaf spring that comes into contact with the operating pin 50 can freely come into contact so that the operation pin 50 can stay at the slide position. It is preferable to provide in.

ところで、本実施形態における操作綱6は、一端を上段梯子体31の上端近傍に連結し、他端を梯子昇降面側を通すとともに、下段梯子体11の下部及び上部に設けた滑車71,72を介して掛け渡して上段梯子体31の下端近傍に連結固定している。かかる構成により、上述した操作中に操作綱6はたるむことがなく、伸びた伸長用梯子体(中段梯子体21と上段梯子体31)から下段梯子体11まで操作綱6は張られた状態となっており、操作綱6が多段梯子1の足下で邪魔になることもない。   By the way, the operation rope 6 in the present embodiment has one end connected to the vicinity of the upper end of the upper ladder body 31 and the other end passed through the ladder ascending / descending surface side, and pulleys 71 and 72 provided at the lower and upper parts of the lower ladder body 11. Is connected and fixed near the lower end of the upper ladder 31. With this configuration, the operation rope 6 does not sag during the above-described operation, and the operation rope 6 is stretched from the extended extension ladder body (the middle ladder body 21 and the upper ladder body 31) to the lower ladder body 11. Therefore, the operation rope 6 does not get in the way under the step of the multi-stage ladder 1.

以下、本実施形態に係る多段梯子1について、図2〜図16を参照しながら、より具体的に説明する。   Hereinafter, the multistage ladder 1 according to the present embodiment will be described more specifically with reference to FIGS.

図2は本実施形態に係る多段梯子1の初期状態である収縮状態を示す全体正面図、図3は同多段梯子1の伸長状態を示す全体正面図、図4は本実施形態の要部となる作動順規制機構の説明図、図5〜図9は同作動順規制機構の作動説明図、図10〜図15は同多段梯子1の伸縮状態を示す説明図、図16は転落防止具8の説明図である。   2 is an overall front view showing a contracted state which is an initial state of the multi-stage ladder 1 according to the present embodiment, FIG. 3 is an overall front view showing an extended state of the multi-stage ladder 1, and FIG. FIG. 5 to FIG. 9 are explanatory diagrams of the operation order regulating mechanism, FIG. 10 to FIG. 15 are explanatory diagrams showing the expansion and contraction state of the multistage ladder 1, and FIG. It is explanatory drawing of.

図2及び図3に示すように、本実施形態に係る多段梯子1は、下側に下段梯子体となる下段梯子体11を設け、同下段梯子体11に、伸長用梯子体としての中段梯子体21及び上段梯子体31をそれぞれ伸縮自在に連結し、操作綱6による操作によって多段(3段)に伸長自在とした構成としている。   As shown in FIGS. 2 and 3, the multi-stage ladder 1 according to the present embodiment is provided with a lower ladder body 11 serving as a lower ladder body on the lower side, and a middle ladder as an extension ladder body in the lower ladder body 11. The body 21 and the upper ladder body 31 are connected to each other so as to be extendable and contractible, and can be extended in multiple stages (three stages) by the operation of the operation rope 6.

下段梯子体11は、図示するように、凹部同士が対向する断面視略コ字状の左右の柱部材12,12(図5(a)を参照)の間に、複数の踏桟13を縦方向に所定間隔をあけて取付けて構成している。同様に、中段梯子体21も凹部同士を互いに対向させた左右の柱部材22,22の間に、複数の踏桟23を縦方向に所定間隔をあけて取付けて構成している。他方、上段梯子体31は、下段梯子体11及び中段梯子体21とは逆に、断面視略コ字状としながらも、凹部がそれぞれ外側を向くように配設された左右の柱部材32,32の間に、複数の踏桟33を縦方向に所定間隔をあけて取付けて構成している。   As shown in the figure, the lower ladder body 11 includes a plurality of step bars 13 vertically disposed between left and right column members 12 and 12 (refer to FIG. 5A) having substantially U-shaped cross-sections in which the recesses face each other. It is configured to be attached at predetermined intervals in the direction. Similarly, the middle ladder body 21 is also configured by attaching a plurality of step bars 23 at predetermined intervals in the vertical direction between the left and right column members 22 and 22 with the recesses facing each other. On the other hand, the upper ladder body 31, contrary to the lower ladder body 11 and the middle ladder body 21, has a substantially U shape in cross section, and left and right column members 32 disposed so that the recesses face outward. 32, a plurality of step bars 33 are attached at predetermined intervals in the vertical direction.

そして、上段梯子体31及び中段梯子体21には、これらを伸長状態で保持するために、踏桟23,13と係合可能としたストッパ部材34,24を柱部材32,32(22,22)内側に設けている(図11〜図15参照)。なお、ストッパ部材24(34)は、中段梯子体21及び上段梯子体31を収縮させる際に、その下降動作に伴って踏桟13,23への係合部24a,34aを自動的に引き込ませて踏桟13,23との係合が回避されるようにした作動桿24c,34cを備えている。図11〜図15において、24b、34bは、中段梯子体21及び上段梯子体31が下降したときに、係合部24a,34aよりも先に踏桟13,23に当接して回動し、その回動に伴って前記作動桿24c,34cに係合部24a,34aの引き込み動作を行わせる振り子部材である。   The upper ladder body 31 and the middle ladder body 21 are provided with stopper members 34 and 24 that are engageable with the crosspieces 23 and 13 in order to hold them in the extended state, and pillar members 32 and 32 (22 and 22). ) Provided inside (see FIGS. 11 to 15). The stopper member 24 (34) automatically retracts the engaging portions 24a and 34a to the step rails 13 and 23 when the middle ladder body 21 and the upper ladder body 31 are contracted when the stopper member 24 (34) is contracted. Actuating rods 24c and 34c are provided so as to avoid engagement with the treads 13 and 23. 11 to 15, 24 b and 34 b rotate in contact with the treads 13 and 23 before the engaging portions 24 a and 34 a when the middle ladder body 21 and the upper ladder body 31 are lowered. It is a pendulum member that causes the operating rods 24c, 34c to retract the engaging portions 24a, 34a with the rotation.

また、下段梯子体11には、その左右の柱部材12,12の下端を結ぶように鞘部41を取付け、この鞘部41内に、左右方向へ伸長して張り出し自在としたアウトリガー4を設けている。このアウトリガー4は、伸縮桿42の先端に、脚部43が高さ調整自在に取り付けられ、この脚部43の下端に接地座44が角度変更自在に取り付けられた周知のものである。   In addition, a sheath 41 is attached to the lower ladder body 11 so as to connect the lower ends of the left and right column members 12, 12, and an outrigger 4 is provided in the sheath 41 that extends in the left-right direction and can be extended. ing. The outrigger 4 is a well-known one in which a leg 43 is attached to the distal end of the telescopic rod 42 so that the height can be adjusted, and a grounding seat 44 is attached to the lower end of the leg 43 so that the angle can be changed.

さらに、図示するように、本実施形態に係る多段梯子1は、上段梯子体31の上端部に、当該多段梯子1を例えば壁面などに立て掛けたときに横ずれを防止するために、フック状に形成した横ずれ防止具5を、上段梯子体31の左右の柱部材32,32上端それぞれに、水平方向に回転可能に取り付けている。   Further, as shown in the figure, the multi-stage ladder 1 according to the present embodiment is formed in a hook shape at the upper end portion of the upper-stage ladder body 31 to prevent lateral displacement when the multi-stage ladder 1 is leaned against a wall surface or the like. The lateral slip prevention tool 5 is attached to the upper ends of the left and right column members 32, 32 of the upper ladder 31 so as to be rotatable in the horizontal direction.

また、下段梯子体11から上段梯子体31にかけて1本の操作綱6が第1滑車71、第2滑車72、第3滑車73、及び第4滑車74を介して掛け渡されている(図1参照)。この操作綱6を下側へ引張り操作することで、上段梯子体31、中段梯子体21と順次伸長し、前記ストッパ部材24,34によって、所望の高さ位置でこれらを保持することができるようになっている。   Further, one operation rope 6 is suspended from the lower ladder body 11 to the upper ladder body 31 via the first pulley 71, the second pulley 72, the third pulley 73, and the fourth pulley 74 (FIG. 1). reference). By pulling the operating rope 6 downward, the upper ladder body 31 and the middle ladder body 21 are sequentially extended so that the stopper members 24 and 34 can hold them at a desired height position. It has become.

より具体的に説明すると、操作綱6の始端は、上段梯子体31の柱部材32,32の上端間に掛け渡した略V字形の親綱連結桿35の中央に連結され、他端を梯子昇降面側を通すとともに、前記下段梯子体11の下側2段目の踏桟13の中央に配設した第1滑車71に掛けて上方へ伸延させ、同下段梯子体11の最上段に位置する踏桟13の中央に吊支した第2滑車72に掛け渡して下方へ伸延させ、次に中段梯子体21の最下端近傍に掛け渡した連結桿25の略中央に取付けた第3滑車73に掛けて上方へ伸延させ、同中段梯子体21の背面側に掛け渡した連結補強板26の略中央に取付けた第4滑車74に掛けて下方へ伸延させ、上段梯子体31の下端近傍に掛け渡した連結桿36に連結固定している。このように操作綱6を掛け渡すことにより、操作綱6はたるむことなく下段梯子体11から上段梯子体31まで張られた状態となる。   More specifically, the starting end of the operation rope 6 is connected to the center of a substantially V-shaped main rope connecting rod 35 spanned between the upper ends of the column members 32, 32 of the upper ladder body 31, and the other end is connected to the ladder. While passing through the lifting surface side, it is hung on the first pulley 71 disposed at the center of the lower second step rail 13 of the lower ladder body 11 and extended upward, and is positioned at the uppermost stage of the lower ladder body 11. The third pulley 73 is attached to the second pulley 72 suspended at the center of the stepping rail 13 and extended downward, and then attached to the approximate center of the connecting rod 25 that is extended to the vicinity of the lowermost end of the middle ladder 21. It is hung on a fourth pulley 74 attached to the approximate center of the connection reinforcing plate 26 hung on the back side of the middle ladder 21 and hung downward, near the lower end of the upper ladder 31. It is connected and fixed to the connecting rod 36 that is stretched. In this way, the operation rope 6 is stretched from the lower ladder body 11 to the upper ladder body 31 without sagging.

そして、本実施形態では、操作綱6における多段梯子1の昇降面側に位置する綱を、転落防止具8(図16参照)と連結するための親綱として使用可能としている。以下、操作綱6のうち、親綱として機能する部分を親綱部60と呼ぶ場合がある。   And in this embodiment, the rope located in the raising / lowering surface side of the multistage ladder 1 in the operation rope 6 can be used as a master rope for connecting with the fall prevention tool 8 (refer FIG. 16). Hereinafter, the portion that functions as the master rope in the operation rope 6 may be referred to as a master rope section 60.

転落防止具8は、所謂「ロリップ」と呼ばれる周知の構成のものであり、図16に示すように、親綱部60を挿通して摺動可能に取り付け、この親綱部60が真っ直ぐに挿通されている場合は自由に摺動するが、一端に急激な力が加わると内部のロック装置(図示せず)が作用して親綱部60に噛合し、急制動がかかるように構成した安全器81を備えている。そして、この安全器81の他端にショックアブソーバ83を介して取り付けた係止具82を、作業者の腰ベルトなどに係止する構成としている。   The fall prevention tool 8 has a known configuration called a “lolip”, and as shown in FIG. 16, the master rope 60 is inserted through the master rope 60 so that the master rope 60 is inserted straight. It is possible to slide freely, but when a sudden force is applied to one end, an internal locking device (not shown) acts to engage with the master rope 60 and apply a sudden braking. A container 81 is provided. And the latching tool 82 attached to the other end of this safety device 81 via the shock absorber 83 is configured to be latched to the operator's waist belt or the like.

かかる構成としたことにより、多段梯子1は、実質的に親綱を予め備えていることになり、多段梯子1を作業現場などに設置した場合、操作綱6を即座に親綱としての機能を発揮させることができる。そして、従来のように、搬送・移動時に親綱を忘れて作業に支障を来したすことがなく、また、自動車などに積載する際にも従来のように親綱の分だけかさばることもない。   By adopting such a configuration, the multistage ladder 1 is substantially provided with a master rope in advance, and when the multistage ladder 1 is installed at a work site or the like, the operation rope 6 immediately functions as a master rope. It can be demonstrated. And, as before, forgetting the master rope at the time of transportation and movement does not hinder the work, and when loading on a car etc., it is not bulky as much as the conventional master rope .

また、図16に示すように、安全器81の側面には、内部に配設したロック装置のストッパ部(図示せず)が回動して、親綱部60に噛み込む位置に至ることを阻害する円孔81bが上側弧状孔81aの一端に形成されている。この円孔81cに、下段梯子体11に取り付けた把持部14の下方位置に突設した係止ピン15を挿通することにより、ストッパ部のピン体81dの動きが不可状態となり、親綱部60は常時自由に安全器81内を摺動することができる。したがって、多段梯子1を伸長させるために親綱部60を操作する場合、使用者は、転落防止具8の安全器81を、前記円孔81cを係止ピン15に係合して吊下しておき、一方の手で把持部14を持ちながら、他方の手で安定した状態で親綱部60を操作することが可能となる。   Further, as shown in FIG. 16, on the side surface of the safety device 81, a stopper portion (not shown) of a locking device disposed therein rotates to reach a position where the stopper portion (not shown) bites into the master rope 60. A blocking circular hole 81b is formed at one end of the upper arcuate hole 81a. By inserting the locking pin 15 projecting at a position below the grip 14 attached to the lower ladder body 11 into the circular hole 81c, the movement of the pin body 81d of the stopper is disabled, and the master rope 60 Can always freely slide in the safety device 81. Therefore, when operating the master rope 60 to extend the multi-stage ladder 1, the user suspends the safety device 81 of the fall prevention tool 8 by engaging the circular hole 81 c with the locking pin 15. It is possible to operate the master rope 60 in a stable state with the other hand while holding the grip portion 14 with one hand.

ここで、図4〜図15にしたがって、本多段梯子1の要部となる作動順規制手段について説明する。
下段梯子体11、中段梯子体21、及び上段梯子体31の各柱部材12,22,32は、図4及び図5(a)に示すように、側壁部12a,22a,32aと、この側壁部12a,22a,32aの両端からそれぞれ立設したフランジ部12b,12b,22b,22b,32b,22bにより断面略コ字状に形成されている。
Here, according to FIGS. 4-15, the operation | movement order control means used as the principal part of this multistage ladder 1 is demonstrated.
As shown in FIGS. 4 and 5A, the pillar members 12, 22, and 32 of the lower ladder body 11, the middle ladder body 21, and the upper ladder body 31 are side walls 12a, 22a, and 32a and the side walls. The flanges 12b, 12b, 22b, 22b, 32b, and 22b that are erected from both ends of the portions 12a, 22a, and 32a are formed in a substantially U-shaped cross section.

本実施形態における作動順規制手段である作動規制機構は、図4に示すように、前記中段梯子体21における柱部材22の側壁部22aの上部位置に、短尺棒状の作動ピン50をスライド自在に嵌装している。そして、上段梯子体31の柱部材32の側壁部32aの下部に、前記作動ピン50を梯子内側、すなわち断面視略コ字状に形成した各柱部材12,22,32の開口側にスライドさせるように、先端から漸次幅広となる先尖の楔形状とした第1のカム部材51を設けるとともに、下段梯子体11の柱部材12の側壁部12aの上部には、逆に前記作動ピン50を梯子外側(柱部材12の側壁部12a側)にスライドさせる、これも第1のカム部材51同様の楔形状とした第2のカム部材52を設け、さらに、前記第2のカム部材52を収納するロック部材53を、下段梯子体11の柱部材12の上部に設けて構成している。また、このロック部材53には、第2のカム部材52により梯子外側にスライドされた作動ピン50が挿入される長孔53aが形成されている。なお、51aは上段梯子体31の柱部材32内に取り付けられた略筒状のカム部材取付金具であり、このカム部材取付金具51aの上端における前記作動ピン50と対応する位置に第1のカム部材51が設けられている。   As shown in FIG. 4, the operation restricting mechanism, which is an operation order restricting means in the present embodiment, allows a short rod-like operation pin 50 to slide on an upper position of the side wall portion 22 a of the column member 22 in the intermediate ladder 21. It is fitted. Then, the operating pin 50 is slid to the inside of the ladder, that is, to the opening side of each of the column members 12, 22, 32 formed in a substantially U shape in cross section, below the side wall portion 32 a of the column member 32 of the upper ladder body 31. Thus, the first cam member 51 having a pointed wedge shape gradually widening from the tip is provided, and the operation pin 50 is disposed on the upper side of the side wall portion 12a of the column member 12 of the lower ladder body 11 on the contrary. A second cam member 52 having a wedge shape similar to that of the first cam member 51 is provided to slide outside the ladder (side wall portion 12a side of the column member 12), and the second cam member 52 is accommodated. The locking member 53 is provided on the upper part of the column member 12 of the lower ladder body 11. Further, the lock member 53 is formed with a long hole 53a into which the operation pin 50 slid to the outside of the ladder by the second cam member 52 is inserted. Reference numeral 51a denotes a substantially cylindrical cam member mounting bracket mounted in the column member 32 of the upper ladder body 31, and the first cam is located at a position corresponding to the operating pin 50 at the upper end of the cam member mounting bracket 51a. A member 51 is provided.

図4〜図7に示すように、作動ピン50には、その基端側(梯子内側であり、図において右側)に前記第1のカム部材51に係合する第1のカム受ピン50aを左右に突設するとともに、その先端側(梯子外側であり、図において左側)には第2のカム部材52に係合する第2のカム受ピン50bを左右に突設している。したがって、多段梯子1の初期状態(図2及び図10に示すように、下段梯子体11の柱部材12に中段梯子体21及び上段梯子体の各柱部材22,32が重合状態に収納されて多段梯子1が収縮している状態)にあっては、作動ピン50の第2のカム受ピン50bに第2のカム部材52が楔状態に食い込み、作動ピン50を下段梯子体11に設けたロック部材53の長孔53a内に突入させた状態となる。   As shown in FIGS. 4 to 7, the operating pin 50 has a first cam receiving pin 50 a that engages with the first cam member 51 on the base end side (inside the ladder, on the right side in the drawing). In addition to projecting left and right, a second cam receiving pin 50b that engages with the second cam member 52 projects left and right on the tip side (outside the ladder, left side in the figure). Accordingly, the initial state of the multi-stage ladder 1 (as shown in FIGS. 2 and 10, the column members 12 of the lower ladder 11 and the column members 22 and 32 of the upper ladder 21 and the column members 22 and 32 of the upper ladder 11 are accommodated in a superposed state. In the state where the multi-stage ladder 1 is contracted), the second cam member 52 bites into the second cam receiving pin 50b of the operating pin 50 in a wedge state, and the operating pin 50 is provided in the lower ladder body 11. The locking member 53 enters the elongated hole 53a.

つまり、図10に示す状態(初期状態)では、中段梯子体21は作動ピン50を介して下段梯子体11にロックされた状態となるため、この状態から操作綱6を引張り操作し多段梯子1を伸長させようとした場合、中段梯子体21の方が上段梯子体31よりも先に上昇することはない。したがって、上段梯子体31と中段梯子体21の各柱部材32,22が例えば変形したり、あるいは両者32,22の間に異物が挟まったりした場合などのように、何らかの理由で両者32,22が密着状態になっていて、操作綱6を作動させる際に通常よりも大きな負荷がかかって重たい操作感が生じたとしても、両者が一緒に上昇するようなことはなく、必ず上段梯子体31が先に伸びることになる。   That is, in the state shown in FIG. 10 (initial state), the middle stage ladder body 21 is locked to the lower stage ladder body 11 via the operating pin 50, and the operation rope 6 is pulled from this state to operate the multistage ladder 1. When trying to extend the middle ladder body 21, the middle ladder body 21 does not rise before the upper ladder body 31. Therefore, both the pillar members 32 and 22 of the upper ladder body 31 and the middle ladder body 21 are deformed or foreign matter is sandwiched between the both 32 and 22 for some reason. Are in close contact with each other, and even when a heavy load is applied and a heavy operational feeling is generated when the operation rope 6 is operated, both of them do not rise together, and the upper ladder body 31 is always sure. Will grow first.

ところで、図4〜図9において、50cは中段梯子体21の柱部材22内に取り付けられた作動ピン受部材であり、断面視略クランク状に形成され、作動ピン50を摺動自在に挿通する挿通孔50dと、断面視円形の作動ピン50がその軸回りに回転して第1、第2のカム受ピン50a,50bが変位することを防止するピン受長孔50eが形成されている。また、50fは、作動ピン50がスライドした位置で留まることができるように、作動ピン50に先端を当接するように配設されたゴム片である。なお、ゴム片50fに代えて板バネを用いることもでき、その場合、作動ピン50の所定のスライド位置で板バネの先端が係合するように、当該作動ピン50に溝部を形成しておくとよい。   4 to 9, reference numeral 50c denotes an operating pin receiving member attached in the column member 22 of the intermediate ladder 21 and is formed in a substantially crank shape in cross section, and is slidably inserted through the operating pin 50. An insertion hole 50d and a pin receiving long hole 50e for preventing the first and second cam receiving pins 50a and 50b from being displaced due to rotation of the operating pin 50 having a circular sectional view around its axis are formed. Reference numeral 50f denotes a rubber piece that is disposed so that the tip of the operating pin 50 comes into contact with the operating pin 50 so that the operating pin 50 can stay at the slid position. A leaf spring may be used in place of the rubber piece 50f. In this case, a groove is formed in the operating pin 50 so that the tip of the leaf spring engages at a predetermined sliding position of the operating pin 50. Good.

図6に示すように、上段梯子体31がさらに上昇すると、その柱部材32の側壁部32aの下部に設けられた第1のカム部材51の楔先端が、先ず第1のカム受ピン50aに当接し、その後さらに上段梯子体31が上昇を続け、略全体が伸び切った状態になると、図7及び図11に示すように、作動ピン50の第1のカム受ピン50aに第1のカム部材51が楔状態に食い込んで作動ピン50を梯子内側に移動させ、先端部がロック部材53の長孔53a内から抜けて中段梯子体21の下段梯子体11とのロック状態が解除される一方、基端部が上段梯子体31の柱部材32の側壁部32aに接近する。   As shown in FIG. 6, when the upper ladder body 31 is further raised, the wedge tip of the first cam member 51 provided at the lower portion of the side wall portion 32a of the column member 32 is first applied to the first cam receiving pin 50a. Then, when the upper ladder body 31 further continues to rise and is substantially fully extended, as shown in FIGS. 7 and 11, the first cam receiving pin 50a of the operating pin 50 has a first cam. While the member 51 bites into the wedge state, the operating pin 50 is moved to the inside of the ladder, and the tip end part comes out of the long hole 53a of the lock member 53, and the locked state with the lower ladder body 11 of the middle ladder body 21 is released. The base end portion approaches the side wall portion 32 a of the column member 32 of the upper ladder body 31.

こうして、上段梯子体31が伸び切り、さらに作業者によって操作綱6が操作されると、図8及び図12に示すように、上段梯子体31に設けられたカム部材取付金具51aの上端が中段梯子体21に設けられた作動ピン受部材50cの下端に当接して、上段梯子体31の上昇に伴いロック状態が解除された中段梯子体21を上昇させていく。   Thus, when the upper ladder body 31 is fully extended and the operator rope 6 is further operated by the operator, the upper end of the cam member mounting bracket 51a provided on the upper ladder body 31 is positioned at the middle stage as shown in FIGS. In contact with the lower end of the operating pin receiving member 50 c provided on the ladder body 21, the middle-stage ladder body 21 released from the locked state is raised as the upper-stage ladder body 31 is raised.

他方、図4及び図6に示すように、上段梯子体31の側壁部32aには、第1のカム部材51から上方位置へ所定間隔をあけて落下防止ストッパ金具54が設けられている。54aは落下防止ストッパ金具54を取付けるためのビスである。   On the other hand, as shown in FIGS. 4 and 6, a drop prevention stopper fitting 54 is provided on the side wall portion 32 a of the upper ladder body 31 at a predetermined interval from the first cam member 51 to the upper position. Reference numeral 54a denotes a screw for mounting the fall prevention stopper fitting 54.

こうして、上段梯子体31が先ず上昇して伸長し、次いで中段梯子体21が下段梯子体11に対して所定高さ上昇して多段梯子1の全長が所望する高さとなった場合、使用者は、図13に示すように、操作綱6を緩めて中段梯子体21のストッパ部材24を、下段梯子体11の踏桟13に係合させる。そして、その後、図14に示すように、操作綱6をさらに操作して上段梯子体31を引き上げ、当該上段梯子体31のストッパ部材34を中段梯子体21の踏桟23に係合させて伸長作業を終えるのであるが、このときに、上段梯子体31のストッパ部材34を中段梯子体21の踏桟23に係合させる前に誤って操作綱6から手を離したりした場合、従来であれば、上段梯子体3が中段梯子体21の下端近傍まで落下してしまうおそれがあったが、図9及び図15に示すように、上段梯子体31に設けた落下防止ストッパ金具54が、上段梯子体31の柱部材32の側壁部32aに近接状態となるまで梯子内側に引き込まれた作動ピン50の基端に当接して、上段梯子体31はそれ以上降下することがない。   Thus, when the upper ladder body 31 is first lifted and extended, and then the middle ladder body 21 is raised by a predetermined height with respect to the lower ladder body 11 and the overall length of the multi-stage ladder body 1 reaches a desired height, the user can As shown in FIG. 13, the operation rope 6 is loosened and the stopper member 24 of the middle ladder body 21 is engaged with the step rail 13 of the lower ladder body 11. Then, as shown in FIG. 14, the operation ladder 6 is further operated to pull up the upper ladder body 31, and the stopper member 34 of the upper ladder body 31 is engaged with the step rail 23 of the middle ladder body 21 to extend. At this time, if the hand is accidentally released from the operation rope 6 before the stopper member 34 of the upper ladder body 31 is engaged with the crosspiece 23 of the middle ladder body 21, it is conventional. In this case, the upper ladder body 3 may fall to the vicinity of the lower end of the middle ladder body 21, but as shown in FIGS. 9 and 15, the fall prevention stopper bracket 54 provided on the upper ladder body 31 is provided with the upper ladder body 31. The upper ladder body 31 does not descend any further by coming into contact with the proximal end of the operating pin 50 drawn inside the ladder until the side wall portion 32a of the pillar member 32 of the ladder body 31 is brought into a close state.

このように、上段梯子体31を伸ばし、さらに中段梯子体21を下段梯子体11の踏桟13一段分よりも上方へ伸ばしたときに、この中段梯子体21を下段梯子体11にロックして、うっかりそのまま操作綱6から手を離してしまっても、上段梯子体31に設けられた落下防止ストッパ金具54が作動ピン50の基端部に当たるため、上段梯子体31は中段梯子体21の下端部まで落下するおそれがなく、極めて安全な伸長作業となる。   In this way, when the upper ladder body 31 is extended and the middle ladder body 21 is further extended upward from the step 13 of the lower ladder body 11, the middle ladder body 21 is locked to the lower ladder body 11. Even if the operation rope 6 is inadvertently released, the fall prevention stopper bracket 54 provided on the upper ladder 31 hits the base end of the operating pin 50, so that the upper ladder 31 is positioned at the lower end of the middle ladder 21. There is no risk of falling to the part, making it an extremely safe extension work.

他方、伸長させた多段梯子1を収縮させるために、操作綱6を緩めて伸長用梯子体を下降させる場合は、先ず、中段梯子体21が降下していくことになる。そして、中段梯子体21の全体が下段梯子体11に略重合する位置まで降下すると、図5に示すように、下段梯子体11に設けた第2のカム部材52が第2のカム受ピン50bに当接して作動ピン50を梯子外側へスライドさせる。したがって、その後に上段梯子体31が降下する際には、上段梯子体31の柱部材32の側壁部32aと作動ピン50の基端との間には十分な間隙が生じることになり、当該上段梯子体31の側壁部32aに設けられた落下防止ストッパ金具54は作動ピン50と干渉することなく通過していくため、上段梯子体31は円滑に下降していき、多段梯子1の収縮も円滑に行われることになる。   On the other hand, in order to contract the extended multi-stage ladder 1, when the operation rope 6 is loosened and the extension ladder body is lowered, first, the middle-stage ladder body 21 is lowered. When the entire middle ladder 21 is lowered to a position where it substantially overlaps the lower ladder 11, the second cam member 52 provided on the lower ladder 11 is moved to the second cam receiving pin 50b as shown in FIG. And the operating pin 50 is slid to the outside of the ladder. Accordingly, when the upper ladder body 31 is subsequently lowered, a sufficient gap is generated between the side wall portion 32a of the column member 32 of the upper ladder body 31 and the base end of the operating pin 50, and the upper stage ladder body 31 is lowered. Since the fall prevention stopper metal fitting 54 provided on the side wall 32a of the ladder body 31 passes without interfering with the operating pin 50, the upper stage ladder body 31 is smoothly lowered and the multistage ladder 1 is smoothly contracted. Will be done.

上述してきた実施形態より、以下の多段梯子1が実現できる。
すなわち、それぞれ左右一対の柱部材12,22,32を有し、柱部材12,22,32同士が伸縮自在に組み合わせられた下段梯子体11及び複数の伸長用梯子体(例えば、中段梯子体21と上段梯子体31)と、前記伸長用梯子体を伸縮操作するための操作綱6とを備え、前記操作綱6を操作して前記複数の伸長用梯子体を伸縮動作させる際に、伸長時には最上位の伸長用梯子体(例えば、上段梯子体31)が初めに作動し、その後下位側(例えば、中段梯子体21)が順次作動して伸長するように規制するとともに、収縮時には、最下位の伸長用梯子体(例えば、中段梯子体21)が初めに作動して、その後、上位側(例えば、上段梯子体31)が順次作動して収縮するように規制する作動順規制手段(例えば、作動規制機構)を備える多段梯子1。
From the embodiment described above, the following multistage ladder 1 can be realized.
That is, the lower ladder body 11 and the plurality of extension ladder bodies (for example, the middle stage ladder body 21) each having a pair of left and right pillar members 12, 22, and 32, in which the pillar members 12, 22, and 32 are stretchably combined. And an upper ladder body 31) and an operation rope 6 for extending and retracting the extension ladder body, and operating the operation rope 6 to extend and retract the plurality of extension ladder bodies. The uppermost extension ladder body (for example, the upper stage ladder body 31) is operated first, and then the lower side (for example, the middle stage ladder body 21) is sequentially operated to be extended. The extension ladder body (for example, the middle ladder body 21) is first actuated, and then the upper order side (for example, the upper ladder body 31) is sequentially actuated so as to be contracted so as to be contracted (for example, Operation restriction mechanism) Multi-section ladder 1.

上記構成において、全ての梯子体(例えば、下段梯子体11、中段梯子体21及び上段梯子体31)の柱部材12,22,32が重合状態となる初期状態(例えば、図2、図10に示す状態)から、前記操作綱6を操作して前記伸長用梯子体(例えば、中段梯子体21と上段梯子体31)を伸長させる際に、前記作動順規制手段(例えば、作動規制機構)は、前記上段梯子体31が初めに作動して伸び切った後、前記中段梯子体21を伸長させ、前記操作綱6を操作して前記伸長用梯子体を収縮させる際には、前記中段梯子体21が初めに作動して下段梯子体11と重合状態になった後、前記上段梯子体31を作動して前記初期状態に復帰させる多段梯子1。   In the above configuration, the initial state (for example, FIG. 2 and FIG. 10) in which the column members 12, 22, and 32 of all the ladder bodies (for example, the lower ladder body 11, the middle ladder body 21, and the upper ladder body 31) are in a superposed state. When the operation rope 6 is operated to extend the extension ladder body (for example, the middle ladder body 21 and the upper ladder body 31) from the state shown in FIG. When the upper ladder body 31 is first actuated and extended, the middle ladder body 21 is extended, and when the operation rope 6 is operated to contract the extension ladder body, the middle ladder body The multi-stage ladder 1 in which the upper stage ladder 31 is operated to return to the initial state after the first stage 21 is activated to be superposed with the lower stage ladder 11.

さらに上記構成において、前記作動順規制手段(例えば、作動規制機構)は、前記伸長用梯子体の下位側梯子体(例えば、中段梯子体21)の柱部材22の上部に、スライド自在に遊嵌された作動ピン50と、前記伸長用梯子体の上位側梯子体(例えば、上段梯子体31)の柱部材32の下部に設けられ、前記作動ピン50を梯子内側にスライドさせる第1のカム部材51と、前記下段梯子体11の柱部材12の上部に設けられ、前記作動ピン50を梯子外側にスライドさせる第2のカム部材52と、前記第2のカム部材52を収納した状態で前記下段梯子体11の柱部材12の上部に設けられ、当該第2のカム部材52により梯子外側にスライドされた前記作動ピン50を係止するロック部材53とを備える多段梯子1。   Further, in the above-described configuration, the operation order restricting means (for example, the operation restricting mechanism) is slidably fitted on an upper portion of the column member 22 of the lower ladder body (for example, the middle ladder body 21) of the extension ladder body. And a first cam member that is provided at a lower portion of a pillar member 32 of an upper ladder body (for example, the upper ladder body 31) of the extension ladder body and slides the operation pin 50 inward of the ladder. 51, a second cam member 52 provided above the pillar member 12 of the lower ladder body 11 and sliding the operating pin 50 to the outside of the ladder, and the lower stage in a state in which the second cam member 52 is housed. A multi-stage ladder 1 including a lock member 53 provided on an upper portion of a pillar member 12 of the ladder body 11 and locking the operating pin 50 slid to the outside of the ladder by the second cam member 52.

本実施形態に係る多段梯子の作動説明図である。It is operation | movement explanatory drawing of the multistage ladder which concerns on this embodiment. 同多段梯子の初期状態である収縮状態を示す全体正面図である。It is a whole front view which shows the contraction state which is the initial state of the multistage ladder. 同多段梯子の伸長状態を示す全体正面図である。It is a whole front view which shows the expansion | extension state of the same multistage ladder. 本実施形態の要部となる作動順規制機構の説明図である。It is explanatory drawing of the operation | movement order control mechanism used as the principal part of this embodiment. 同作動順規制機構の作動説明図である。It is operation | movement explanatory drawing of the same operation | movement order control mechanism. 同作動順規制機構の作動説明図である。It is operation | movement explanatory drawing of the same operation | movement order control mechanism. 同作動順規制機構の作動説明図である。It is operation | movement explanatory drawing of the same operation | movement order control mechanism. 同作動順規制機構の作動説明図である。It is operation | movement explanatory drawing of the same operation | movement order control mechanism. 同作動順規制機構の作動説明図である。It is operation | movement explanatory drawing of the same operation | movement order control mechanism. 本実施形態に係る多段梯子の伸縮状態を示す説明図である。It is explanatory drawing which shows the expansion-contraction state of the multistage ladder which concerns on this embodiment. 同多段梯子の伸縮状態を示す説明図である。It is explanatory drawing which shows the expansion-contraction state of the multistage ladder. 同多段梯子の伸縮状態を示す説明図である。It is explanatory drawing which shows the expansion-contraction state of the multistage ladder. 同多段梯子の伸縮状態を示す説明図である。It is explanatory drawing which shows the expansion-contraction state of the multistage ladder. 同多段梯子の伸縮状態を示す説明図である。It is explanatory drawing which shows the expansion-contraction state of the multistage ladder. 同多段梯子の伸縮状態を示す説明図である。It is explanatory drawing which shows the expansion-contraction state of the multistage ladder. 転落防止具の説明図である。It is explanatory drawing of a fall prevention tool.

符号の説明Explanation of symbols

1 多段梯子
5 作動順規制機構
6 操作綱
8 転落防止具
11 下段梯子体
12,22,32 柱部材
13,23,33 踏桟
21 中段梯子体
31 上段梯子体
50 作動ピン
51 第1のカム部材
52 第2のカム部材
53 ロック部材
DESCRIPTION OF SYMBOLS 1 Multistage ladder 5 Operation | movement order regulation mechanism 6 Operation rope 8 Fall prevention tool 11 Lower ladder body 12,22,32 Pillar member 13,23,33 Walker 21 Middle stage ladder body 31 Upper stage ladder body 50 Actuation pin 51 First cam member 52 Second cam member 53 Lock member

Claims (3)

それぞれ左右一対の柱部材を有し、柱部材同士が伸縮自在に組み合わせられた下段梯子体及び複数の伸長用梯子体と、
前記伸長用梯子体を伸縮操作するための操作綱と、
を備えた伸縮自在の多段梯子において、
前記操作綱を操作して前記複数の伸長用梯子体を伸縮動作させる際に、伸長時には最上位の伸長用梯子体が初めに作動し、その後下位側が順次作動して伸長するように規制するとともに、収縮時には、最下位の伸長用梯子体が初めに作動して、その後、上位側が順次作動して収縮するように規制する作動順規制手段を備えることを特徴とする多段梯子。
A lower ladder body and a plurality of extension ladder bodies, each having a pair of left and right pillar members, in which the pillar members are stretchably combined, and
An operation rope for extending and contracting the elongating ladder,
In a stretchable multi-stage ladder with
When the operation rope is operated to extend and retract the plurality of extension ladders, the uppermost extension ladder body is activated first at the time of extension, and then the lower side is sequentially operated to be extended. The multi-stage ladder is provided with an operation order restricting means for restricting the lowermost extension ladder body to operate first, and then the upper side sequentially operates and contracts during contraction.
前記伸長用梯子体を、中段梯子体と上段梯子体とから構成し、全ての梯子体の柱部材が重合状態となる初期状態から、前記操作綱を操作して前記伸長用梯子体を伸長させる際に、前記作動順規制手段は、前記上段梯子体が初めに作動して伸び切った後、前記中段梯子体を伸長させ、前記操作綱を操作して前記伸長用梯子体を収縮させる際には、前記中段梯子体が初めに作動して下段梯子体と重合状態になった後、前記上段梯子体を作動して前記初期状態に復帰させることを特徴とする請求項1に記載の多段梯子。   The elongating ladder body is composed of an intermediate ladder body and an upper ladder body, and the elongating ladder body is extended by operating the operation rope from an initial state in which the column members of all the ladder bodies are in a superposed state. When the upper order ladder body is first actuated and extended, the middle order ladder body is extended, and the operation rope is operated to contract the extension ladder body. 2. The multi-stage ladder according to claim 1, wherein after the middle ladder body is first operated to be in a superposed state with the lower ladder body, the upper ladder body is operated to return to the initial state. . 前記作動順規制手段は、
前記伸長用梯子体の下位側梯子体の柱部材の上部に、スライド自在に遊嵌された作動ピンと、
前記伸長用梯子体の上位側梯子体の柱部材の下部に設けられ、前記作動ピンを梯子内側にスライドさせる第1のカム部材と、
前記下段梯子体の柱部材の上部に設けられ、前記作動ピンを梯子外側にスライドさせる第2のカム部材と、
前記第2のカム部材を収納した状態で前記下段梯子体の柱部材の上部に設けられ、当該第2のカム部材により梯子外側にスライドされた前記作動ピンを係止するロック部材と、
を備えることを特徴とする請求項1又は2に記載の多段梯子。
The operation order regulating means is:
An operation pin slidably fitted on the upper part of the pillar member of the lower ladder of the extension ladder;
A first cam member provided at a lower portion of a pillar member of an upper ladder body of the extension ladder body, and sliding the operating pin inside the ladder;
A second cam member provided on an upper portion of the pillar member of the lower ladder body and sliding the operating pin to the outside of the ladder;
A lock member that is provided on an upper portion of the pillar member of the lower ladder body in a state in which the second cam member is housed, and that locks the operating pin that is slid to the outside of the ladder by the second cam member;
The multi-stage ladder according to claim 1, wherein the multi-stage ladder is provided.
JP2008138788A 2008-05-27 2008-05-27 Multistage ladder Active JP5096229B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2008138788A JP5096229B2 (en) 2008-05-27 2008-05-27 Multistage ladder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2008138788A JP5096229B2 (en) 2008-05-27 2008-05-27 Multistage ladder

Publications (2)

Publication Number Publication Date
JP2009287220A true JP2009287220A (en) 2009-12-10
JP5096229B2 JP5096229B2 (en) 2012-12-12

Family

ID=41456704

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2008138788A Active JP5096229B2 (en) 2008-05-27 2008-05-27 Multistage ladder

Country Status (1)

Country Link
JP (1) JP5096229B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107503670B (en) * 2016-07-29 2019-02-12 国网山东省电力公司龙口市供电公司 Drawing and pulling type power equipment maintaining ladder

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08270345A (en) * 1995-03-29 1996-10-15 Aruinko Kk Extension ladder
JP2000136688A (en) * 1998-11-02 2000-05-16 Matsuoka Kenki Kk Fabricated ladder and auxiliary lengthening attachment for ladder
JP2004197456A (en) * 2002-12-19 2004-07-15 Nippon Kinzoku Co Ltd Emergency ladder apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08270345A (en) * 1995-03-29 1996-10-15 Aruinko Kk Extension ladder
JP2000136688A (en) * 1998-11-02 2000-05-16 Matsuoka Kenki Kk Fabricated ladder and auxiliary lengthening attachment for ladder
JP2004197456A (en) * 2002-12-19 2004-07-15 Nippon Kinzoku Co Ltd Emergency ladder apparatus

Also Published As

Publication number Publication date
JP5096229B2 (en) 2012-12-12

Similar Documents

Publication Publication Date Title
US10145176B2 (en) Elevated working platform and related methods
US11697965B2 (en) Ladder safely mechanisms
CN110185379B (en) Ladder with adjustable height
WO2015042273A1 (en) Ladder securing apparatus, ladders incorporating same and related methods
ITMI20090656A1 (en) FASTENING NETWORK STRUCTURE WITH AUTOMATIC LOCKING DEVICE
KR20190113754A (en) Lifting device for lowering the lifting rail, and method for lowering the lifting rail
KR102101779B1 (en) A Cage lifting system for building construction with slide footrest unit
KR101346387B1 (en) SAFTY DOOR FOR SCAFFOLD BOARD of GANG FORM
JP5096229B2 (en) Multistage ladder
JP4801011B2 (en) Ladder length adjustment device
JP6941016B2 (en) Telescopic lock mechanism of the telescopic leg device in the stepladder that also serves as a ladder
JP2010115758A (en) Portable workbench device
JP4955456B2 (en) Multistage ladder
JP4836683B2 (en) Step for lifting truck bed
KR102409753B1 (en) Device for lifting up and down structures
JP2001262963A (en) Ladder
JP2010180635A (en) Ladder for utility pole
WO2014078950A1 (en) Safety extension device for a ladder
JP6262601B2 (en) Triple telescopic ladder
JP4053850B2 (en) Telescopic mechanism and multi-stage ladder including the telescopic mechanism
JP2019112777A (en) Telescopic hanging ladder
JP5616068B2 (en) Wire lift
JP2008285967A (en) Lateral slip prevention implement for multi-step ladder
JP2010053671A (en) Ladder
JPH074318Y2 (en) Telescopic ladder

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20110323

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20120510

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20120522

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20120717

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20120904

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20120920

R150 Certificate of patent or registration of utility model

Ref document number: 5096229

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20150928

Year of fee payment: 3

S531 Written request for registration of change of domicile

Free format text: JAPANESE INTERMEDIATE CODE: R313531

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250