JP2010024799A - Deployment preventing structure for retractable ladder - Google Patents

Deployment preventing structure for retractable ladder Download PDF

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JP2010024799A
JP2010024799A JP2008191097A JP2008191097A JP2010024799A JP 2010024799 A JP2010024799 A JP 2010024799A JP 2008191097 A JP2008191097 A JP 2008191097A JP 2008191097 A JP2008191097 A JP 2008191097A JP 2010024799 A JP2010024799 A JP 2010024799A
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fixed
column
fixed column
locking
locking pin
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Kazunori Matsuo
和徳 松尾
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Bunka Shutter Co Ltd
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Bunka Shutter Co Ltd
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    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C9/00—Ladders characterised by being permanently attached to fixed structures, e.g. fire escapes
    • E06C9/06—Ladders characterised by being permanently attached to fixed structures, e.g. fire escapes movably mounted
    • E06C9/08—Ladders characterised by being permanently attached to fixed structures, e.g. fire escapes movably mounted with rigid longitudinal members
    • E06C9/085—Ladders characterised by being permanently attached to fixed structures, e.g. fire escapes movably mounted with rigid longitudinal members ladders unfolded in the direction of the longitudinal members
    • 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

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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a deployment preventing structure for a retractable ladder in which engagement can be easily released in an emergency while the release of the engagement from downstairs is made difficult without impairing its decorative property of appearance. <P>SOLUTION: The deployment preventing structure for the retractable ladder 100 is equipped with a fixed column 13 fixed to a building, and a movable column 17 which can be rotatably fixed to other ends 15b of a plurality of treads 15, one ends 15a of the treads being rotatably fixed to the fixed column 13, and moves vertically in parallel relative to the fixed column 13 to be accommodated therein and deployed. The movable column 17 comes closer along the fixed column 13 at the accommodated position with its upper end 27 arranged to the same height of the upper end 25 of the fixed column 13, and a rock tool which is detachably inserted from above to prevent the deployment of the movable column 17 is provided at the upper ends 25, 27 of the fixed column 13 and the movable column 17 arranged at the same heights. The rock tool and the upper ends 25, 27 are provided with an engaging means restricting the slip-off of the rock tool in a direction opposite to the insertion direction with a rock pin 33 orthogonal to the insertion direction of the rock pin. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、建物に固定される固定柱と、この固定柱に踏桟を介して上下方向に平行移動して収納及び展開される可動柱とを備えてなる折り畳み梯子の展開防止構造に関する。   The present invention relates to a folding ladder unfolding prevention structure including a fixed column fixed to a building and a movable column that is stored in and expanded in parallel with the fixed column through a traverse.

従来より、マンション等の避難用梯子として、建物に固定されて収納・展開自在となった折り畳み梯子が知られている（例えば、特許文献１参照）。この折り畳み梯子は、下枠、上枠、固定縦桟、可動縦桟、及び複数の踏桟とからなり、固定縦桟はその下端部が下枠に固定され且つ上端部が上枠に固定され、踏桟はその一方端が固定縦桟に他方端が可動縦桟に回動自在に固定される。通常時は、固定縦桟と可動縦桟及び踏桟が１本の棒状に折り畳まれた状態にあり、使用時には可動縦桟を押し下げることにより、ワンタッチで梯子に展開できる。開いた状態では下枠、上枠、固定縦桟、可動縦桟とで閉構造をなして剛性が増し、安全に避難することができた。このように折り畳み梯子は、普段は一本棒に見えるので美観に良く、又普段は一本なので、いたずらで昇り降りすることもない。火災時には有効な梯子となり人命を救う（特許文献２参照）。
特開２００４−４４２４７号公報 実開昭６３−７３５００号公報 2. Description of the Related Art Conventionally, a folding ladder that is fixed to a building and can be stored and deployed is known as an evacuation ladder for an apartment or the like (see, for example, Patent Document 1). The folding ladder includes a lower frame, an upper frame, a fixed vertical beam, a movable vertical beam, and a plurality of step bars. The fixed vertical beam has a lower end fixed to the lower frame and an upper end fixed to the upper frame. The treadle has one end rotatably fixed to the fixed vertical cross and the other end fixed to the movable vertical cross. Normally, the fixed vertical bar, the movable vertical bar, and the step bar are folded into a single bar. During use, the movable vertical bar can be pushed down to be deployed on the ladder with one touch. In the open state, the lower frame, the upper frame, the fixed vertical beam, and the movable vertical beam form a closed structure, which increases the rigidity and allows safe evacuation. In this way, the folding ladder looks good as it usually looks like a single bar, and since it usually has one, it doesn't go up and down accidentally. In the event of a fire, it becomes an effective ladder and saves lives (see Patent Document 2).
JP 2004-44247 A Japanese Utility Model Publication No. 63-73500

ところで、折り畳み梯子は、棒状に収納が行え、外観意匠が良好である反面、通常の収納状態にあっても可動縦桟が階下に達しているため、悪意のある侵入者が階下から可動縦桟をガタガタ揺する等の外力を加えると、緊締具の係止が外れて、梯子が使用可能状態に展開され、不法侵入を許してしまう虞があった。その一方で、厳重な係止装置を設ければ、緊急時の係止解除が容易に行えず、安全性の確保が困難となるとともに、装置が大型化すれば、折角の良好な外観を低下させることにもなった。このため、外観意匠性を低下させることなく、緊急時の係止解除は容易に行え、しかも、防犯性は確保することのできる折り畳み梯子の展開防止構造が切望されていた。   By the way, the folding ladder can be stored in a rod shape, and the appearance design is good, but the movable vertical rail reaches the downstairs even in the normal storage state, so a malicious intruder can move from the downstairs to the movable vertical rail. When an external force such as shaking is applied, the fasteners are unlocked, and the ladder is deployed into a usable state, which may allow illegal intrusion. On the other hand, if a strict locking device is provided, it will not be possible to easily release the lock in an emergency, making it difficult to ensure safety. It was also made to let me. For this reason, there has been a strong demand for a folding ladder unfolding prevention structure that can be easily unlocked in an emergency without deteriorating the appearance design, and that can secure crime prevention.

本発明は上記状況に鑑みてなされたもので、外観意匠を損なわず、緊急時の係止解除は容易に行えるとともに、階下等からの係止解除は困難にできる折り畳み梯子の展開防止構造を提供し、もって、見栄え、防犯性、緊急対応性の向上を図ることを目的とする。   The present invention has been made in view of the above situation, and provides a folding ladder unfolding prevention structure that can be easily unlocked in an emergency and difficult to unlock from the downstairs etc. without impairing the appearance design. Therefore, it aims to improve appearance, crime prevention, and emergency response.

次に、上記の課題を解決するための手段を、実施の形態に対応する図面を参照して説明する。
本発明の請求項１記載の折り畳み梯子の展開防止構造は、建物１１に固定される固定柱１３と、該固定柱１３に一端１５ａが回動自在に固定された複数の踏桟１５の他端１５ｂに回動自在に固定され前記固定柱１３に対して上下方向に平行移動して収納及び展開される可動柱１７と、を備えてなる折り畳み梯子の展開防止構造であって、
前記可動柱１７は、前記収納の位置で前記固定柱１３に沿って近接するとともに、上端部２７が前記固定柱１３の上端部２５と同一高さに配置され、
同一高さに配置された該固定柱１３及び該可動柱１７の上端部２５，２７に上方から着脱自在に挿入されて前記可動柱１７の展開を阻止する係止具３１を備え、
該係止具３１と前記上端部２５，２７には前記挿入の方向と直交方向の係止ピン３３にて挿入反対方向の前記係止具３１の抜脱を規制する係合手段３５が設けられたことを特徴とする。 Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments.
The folding ladder unfolding prevention structure according to claim 1 of the present invention includes a fixed column 13 fixed to a building 11 and the other ends of a plurality of step bars 15 having one end 15a rotatably fixed to the fixed column 13. 15b, a movable column 17 that is pivotally fixed to the fixed column 13 and is moved in parallel with respect to the fixed column 13 to be housed and deployed.
The movable column 17 is close along the fixed column 13 at the storage position, and the upper end 27 is disposed at the same height as the upper end 25 of the fixed column 13,
A locking member 31 that is detachably inserted from above into the fixed column 13 and the upper end portions 25, 27 of the movable column 17 disposed at the same height and prevents the movable column 17 from being unfolded;
The locking tool 31 and the upper end portions 25 and 27 are provided with engaging means 35 for restricting the locking tool 31 in the direction opposite to the insertion direction by a locking pin 33 perpendicular to the insertion direction. It is characterized by that.

この折り畳み梯子１００の展開防止構造では、係止具３１が上方向でなければ引き抜けず、しかも、単に挿入反対方向に抜こうとしても係止ピン３３にて抜脱が阻止され、上階での脱着操作性を低下させることなく、階下からの脱着が困難となる。   In this structure for preventing the folding ladder 100 from being unfolded, the locking tool 31 cannot be pulled out unless it is in the upward direction, and even if it is simply pulled out in the direction opposite to the insertion, the locking pin 33 prevents it from being pulled out. Desorption from the downstairs becomes difficult without deteriorating desorption operability.

請求項２記載の折り畳み梯子の展開防止構造は、前記係合手段３５が、
前記固定柱１３及び前記可動柱１７の上端部２５，２７から前記挿入の方向と直交方向に突出する前記係止ピン３３と、
前記係止具３１に凹設され前記挿入方向に対し傾斜する斜め溝３７を有して該係止ピン３３を受け入れる係合溝３９と、
からなることを特徴とする。 In the folding ladder unfolding prevention structure according to claim 2, the engaging means 35 includes:
The locking pin 33 protruding in the direction orthogonal to the insertion direction from the upper end portions 25 and 27 of the fixed column 13 and the movable column 17;
An engaging groove 39 that is recessed in the locking tool 31 and has an oblique groove 37 that is inclined with respect to the insertion direction and receives the locking pin 33;
It is characterized by comprising.

この折り畳み梯子の展開防止構造では、上端部２５，２７に挿入されている係止具３１を引き抜きながら、係止ピン３３が斜め溝３７に沿って移動するように回転させることで、係止具３１が上端部２５．２７から脱着可能となる。   In this folding ladder unfolding prevention structure, the locking pin 33 is rotated so as to move along the oblique groove 37 while pulling out the locking tool 31 inserted in the upper end portions 25 and 27, thereby locking the locking tool. 31 can be detached from the upper end 25.27.

請求項３記載の折り畳み梯子の展開防止構造は、前記係合手段３５が、
前記固定柱１３及び前記可動柱１７の上端部２５，２７に挿入された前記係止具３１Ｂを、前記固定柱１３及び前記可動柱１７と共に貫通する前記係止ピン５３と、
該係止ピン５３の基端に固設され貫通穴６１からの抜けを阻止する大径把持部５５と、
前記係止ピン５３の先端に螺合されるナット部材５９と、
からなることを特徴とする。 In the folding ladder unfolding prevention structure according to claim 3, the engaging means 35 includes:
The locking pin 53 penetrating the locking tool 31B inserted into the upper end portions 25 and 27 of the fixed column 13 and the movable column 17 together with the fixed column 13 and the movable column 17;
A large-diameter gripping portion 55 that is fixed to the base end of the locking pin 53 and prevents the through-hole 61 from coming off;
A nut member 59 screwed into the tip of the locking pin 53;
It is characterized by comprising.

この折り畳み梯子の展開防止構造では、ナット部材５９と大径把持部５５を両手で持って螺合解除し、係止ピン５３を挿入の方向と直交方向に抜き取った後に、係止具３１Ｂが上端部から脱着可能となる。   In this folding ladder unfolding prevention structure, the nut member 59 and the large-diameter gripping portion 55 are held with both hands to release the screw, and after the locking pin 53 is pulled out in the direction perpendicular to the insertion direction, the locking tool 31B is Detachable from the part.

請求項４記載の折り畳み梯子の展開防止構造は、前記係止具３１の上端面４３に、手掛け部４５が設けられたことを特徴とする。   The folding ladder development preventing structure according to claim 4 is characterized in that a handle 45 is provided on the upper end surface 43 of the locking tool 31.

この折り畳み梯子の展開防止構造では、手掛け部４５が上端面４３に配設されていることで、上階からの操作性にのみ寄与し、階下からの操作性、すなわち、把持易さは向上されない。   In this folding ladder unfolding prevention structure, the handle 45 is disposed on the upper end surface 43, so that it contributes only to the operability from the upper floor, and the operability from the lower floor, that is, the ease of gripping is not improved. .

請求項５記載の折り畳み梯子の展開防止構造は、前記係止具３１が、可撓性線体で固定物に締結されて前記上端部２５，２７に着脱自在となったことを特徴とする。   The folding ladder unfolding prevention structure according to claim 5 is characterized in that the locking tool 31 is fastened to a fixed object by a flexible wire and is detachable from the upper end portions 25 and 27.

この折り畳み梯子の展開防止構造では、折り畳み梯子を展開するために、上端部２５，２７から係止具３１が脱着されても、係止具３１が可撓性線体を介して固定物に繋がれて、上端部２５，２７の傍らから離れない。   In this folding ladder unfolding prevention structure, in order to unfold the folding ladder, even if the latching tool 31 is detached from the upper end portions 25 and 27, the latching tool 31 is connected to the fixed object via the flexible wire. And does not leave the side of the upper end portions 25 and 27.

本発明に係る請求項１記載の折り畳み梯子の展開防止構造によれば、同一高さに配置された固定柱及び可動柱の上端部に着脱自在に挿入されて可動柱の展開を阻止する係止具を備え、係止具と上端部には、挿入の方向と直交方向の係止ピンにて挿入反対方向の係止具の抜脱を規制する係合手段を設けたので、係止具が上方向でなければ引き抜けず、しかも、単に挿入反対方向に抜こうとしても係止ピンにて抜脱が阻止され、上階での脱着操作性を低下させることなく、階下からの脱着は困難にできる。これにより、外観意匠を損なわず、緊急時の展開は容易に行えるとともに、階下からの展開は困難にできる。この結果、見栄え、緊急対応性を低下させずに、防犯性を向上させることができる。   According to the folding ladder unfolding prevention structure according to claim 1 of the present invention, the latch that is detachably inserted into the upper end of the fixed column and the movable column arranged at the same height and prevents the unfolding of the movable column. Since the locking tool and the upper end portion are provided with engaging means for restricting removal of the locking tool in the direction opposite to the insertion direction by a locking pin orthogonal to the insertion direction, If it is not in the upward direction, it cannot be pulled out. it can. As a result, the appearance design is not impaired, and the emergency development can be easily performed, and the development from the downstairs can be made difficult. As a result, crime prevention can be improved without deteriorating appearance and emergency response.

請求項２記載の折り畳み梯子の展開防止構造によれば、係合手段が、固定柱及び可動柱の上端部から挿入方向と直交方向に突出する係止ピンと、係止具に凹設され挿入方向に対し傾斜する斜め溝を有して係止ピンを受け入れる係合溝とからなるので、上端部に挿入されている係止具を、引き抜きながら、係止ピンが斜め溝に沿って移動するように回転させることで、係止具の上階での取り外し性を低下させずに、階下からの取り外しを困難にできる。   According to the folding ladder unfolding prevention structure according to claim 2, the engaging means includes a locking pin projecting in a direction orthogonal to the insertion direction from the upper ends of the fixed column and the movable column, and an insertion direction recessed in the locking tool. Since the engaging groove has an inclined groove that is inclined with respect to the engaging groove and receives the engaging pin, the engaging pin moves along the oblique groove while pulling out the engaging tool inserted in the upper end portion. Rotating to the bottom makes it difficult to remove from the lower floor without deteriorating the detachability on the upper floor of the locking tool.

請求項３記載の折り畳み梯子の展開防止構造によれば、係合手段が、上端部に挿入された係止具を固定柱及び可動柱と共に貫通する係止ピンと、係止ピンの基端に固設され貫通穴からの抜けを阻止する大径把持部と、係止ピンの先端に螺合されるナット部材とからなるので、ナット部材と大径把持部を両手で持って螺合解除し、係止ピンを挿入の方向と直交方向に抜き取った後に、係止具を引き抜き可能とすることで、係止具の上階での取り外し性を低下させずに、階下からの取り外しを困難にできる。   According to the folding ladder unfolding prevention structure of the third aspect, the engaging means is fixed to the locking pin that penetrates the locking tool inserted in the upper end portion together with the fixed column and the movable column, and the base end of the locking pin. Because it consists of a large-diameter gripping part that is installed and prevents it from coming out of the through hole and a nut member that is screwed to the tip of the locking pin, hold the nut member and the large-diameter gripping part with both hands to release the screwing, By making it possible to pull out the locking tool after the locking pin is pulled out in the direction perpendicular to the insertion direction, it is possible to make it difficult to remove the locking tool from the lower floor without reducing the detachability of the locking tool on the upper floor. .

請求項４記載の折り畳み梯子の展開防止構造によれば、係止具の上端面に、手掛け部が設けられたので、階下からの係止具の把持を困難にしつつ、上階での係止具の把持を容易にすることができる。   According to the folding ladder unfolding prevention structure according to claim 4, since the handle portion is provided on the upper end surface of the locking tool, it is difficult to hold the locking tool from the lower floor, and the locking on the upper floor is performed. The tool can be easily held.

請求項５記載の折り畳み梯子の展開防止構造によれば、係止具が、可撓性線体で固定物に締結されて上端部に着脱自在となったので、上端部から脱着された係止具の紛失を防止することができる。   According to the folding ladder unfolding prevention structure according to claim 5, since the locking tool is fastened to the fixed object by the flexible wire body and is detachable from the upper end portion, the locking is detached from the upper end portion. The loss of tools can be prevented.

以下、本発明に係る折り畳み梯子の展開防止構造の好適な実施の形態を図面を参照して詳細に説明する。
図１は本発明に係る展開防止構造を備えた折り畳み梯子の展開状態を（ａ）、収納状態を（ｂ）で表した上部斜視図、図２は図１に示した折り畳み梯子の収納状態を（ａ）、展開状態を（ｂ）で表した正面図である。
展開防止構造を備える折り畳み梯子１００は、建物、例えばバルコニーの壁部１１に固定される固定柱１３と、この固定柱１３に一端１５ａが回動自在に固定された複数の踏桟１５の他端１５ｂに回動自在に固定され固定柱１３に対して上下方向に平行移動して収納及び展開される可動柱１７とを備える。 DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a preferred embodiment of a folding ladder unfolding prevention structure according to the invention will be described in detail with reference to the drawings.
FIG. 1 is an upper perspective view showing the folded state of the folding ladder provided with the unfolding preventing structure according to the present invention in (a) and the stored state in (b), and FIG. 2 shows the stored state of the folded ladder shown in FIG. (A), It is the front view which represented the expansion | deployment state by (b).
The folding ladder 100 having the unfolding prevention structure includes a fixed column 13 fixed to a wall 11 of a building, for example, a balcony, and the other ends of a plurality of step bars 15 having one end 15a rotatably fixed to the fixed column 13. And a movable column 17 which is fixed to 15b so as to be pivotable and is accommodated and deployed by translating vertically with respect to the fixed column 13.

固定柱１３及び可動柱１７は、それぞれが円筒を半割にした形状で形成され、収納状態では、図１（ｂ）に示すように、円筒状、外観としては一本の棒状となる。固定柱１３及び可動柱１７の内側湾曲面にはコ字形状のブラケット１９が固設され、ブラケット１９は内側に配置した踏桟１５の一端１５ａ、他端１５ｂを、貫通する回動軸２１にて回動自在に固定する。固定柱１３及び可動柱１７は、同一長さで形成される。固定柱１３は、図２（ａ）に示すように、階下のバルコニー床２３から浮上して配置される。この浮上距離Ｈは、展開時における可動柱１７の下方移動距離Ａと一致する。   Each of the fixed column 13 and the movable column 17 is formed in a shape in which a cylinder is divided in half, and in the housed state, as shown in FIG. A U-shaped bracket 19 is fixed to the inner curved surfaces of the fixed column 13 and the movable column 17, and the bracket 19 is connected to the rotating shaft 21 that passes through one end 15 a and the other end 15 b of the step rail 15 disposed inside. And fix it freely. The fixed column 13 and the movable column 17 are formed with the same length. As shown in FIG. 2A, the fixed column 13 is disposed so as to float from the balcony floor 23 below the floor. This flying distance H coincides with the downward movement distance A of the movable column 17 during deployment.

したがって、通常時は、図２（ａ）に示すように、固定柱１３と可動柱１７及び踏桟１５が１本の棒状に折り畳まれた状態にあり、使用時には、図２（ｂ）に示すように、可動柱１７を押し下げることにより、簡単に梯子に展開できる。開いた状態では可動柱１７の下端１７ａがバルコニー床２３に接地して支持され、ぐらつくことなく安全に避難することができる。   Therefore, in the normal state, as shown in FIG. 2A, the fixed column 13, the movable column 17, and the traverse 15 are folded into a single bar, and in use, as shown in FIG. 2B. Thus, by pushing down the movable column 17, it can be easily deployed on a ladder. In the open state, the lower end 17a of the movable column 17 is grounded and supported by the balcony floor 23, and can be safely evacuated without wobbling.

図３は変形例に係る分割型折り畳み梯子の収納状態を（ａ）、展開状態を（ｂ）で表した正面図である。
なお、折り畳み梯子１００は、図３に示すように、上下に連結される分割構造とすることができる。図例では、固定柱１３及び可動柱１７が、分割固定柱１３Ａ，１３Ｂ，１３Ｃ、分割可動柱１７Ａ，１７Ｂ，１７Ｃのそれぞれ３つに分割されることで、それぞれが踏桟１５によって連結された上中下段の３分割構造となっている。このような分割構造とすることで、折り畳み梯子の運搬性、現場搬入性、設置施工性を向上させることができる。すなわち、この分割可動柱の構造によれば、下段の分割可動柱１７Ｃは、その上側の分割可動柱１７Ｂが展開しないと展開できず、この分割可動柱１７Ｂは、その上側の分割可動柱１７Ａが展開しないと展開できないようになっている。つまり、上方の分割可動柱１７Ａを階下からの展開が困難なようにしておけば、その下方の分割可動柱１７Ｃも分割可動柱１７Ｂも階下からの展開が困難となる。また、分割可動柱１７Ｂは、その下側の分割可動柱１７Ｃが収納しないと収納できず、分割可動柱１７Ａは、その下側の分割可動柱１７Ｂが収納しないと収納できないようになっており、すなわち、正しい収納状態へと自然に導かれるようになっている。 FIG. 3 is a front view showing the storage state of the split folding ladder according to the modification as (a) and the unfolded state as (b).
In addition, the folding ladder 100 can be made into the division structure connected up and down, as shown in FIG. In the illustrated example, the fixed column 13 and the movable column 17 are divided into three divided fixed columns 13A, 13B, and 13C, and divided movable columns 17A, 17B, and 17C, respectively, so that each is connected by a footrail 15. The upper, middle, and lower tiers are divided into three. By setting it as such a division | segmentation structure, the conveyance property of a folding ladder, on-site carrying property, and installation construction property can be improved. That is, according to this split movable column structure, the lower split movable column 17C cannot be expanded unless the upper split movable column 17B is deployed, and the split movable column 17B has the upper split movable column 17A. If it is not expanded, it cannot be expanded. That is, if the upper divided movable column 17A is made difficult to expand from the downstairs, it is difficult for the lower divided movable column 17C and the divided movable column 17B to expand from the lower floor. The split movable column 17B cannot be stored unless the lower split movable column 17C is stored, and the split movable column 17A cannot be stored unless the lower split movable column 17B is stored. That is, it is naturally guided to the correct storage state.

図４は上端部と係止具の分解斜視図である。
可動柱１７は、収納の位置で固定柱１３に沿って近接するとともに、上端部２７が固定柱１３の上端部２５と同一高さに配置される。展開防止構造では、この同一高さに配置された固定柱１３及び可動柱１７の上端部２５，２７に上方から着脱自在に挿入されて可動柱１７の展開を阻止する係止具３１を備える。この係止具３１は、図１（ｂ），図２（ａ），図３（ａ）に示すような折り畳み梯子の収納状態で、収納状態の折り畳み梯子の上端に被せられ展開を阻止し、図２（ｂ），図３（ｂ）のように外されることで、折り畳み梯子の展開を可能にする。係止具３１と上端部２５，２７には、挿入の方向（図４の矢印ａ方向）に対して直交する方向（矢印ｂ方向）の係止ピン３３にて挿入反対方向（図４の矢印ｃ方向）すなわち取り外し方向への係止具３１の抜脱を規制する係合手段３５が設けられている。 FIG. 4 is an exploded perspective view of the upper end portion and the locking tool.
The movable column 17 is close along the fixed column 13 at the storage position, and the upper end 27 is disposed at the same height as the upper end 25 of the fixed column 13. In the unfolding prevention structure, there is provided a locking tool 31 that is detachably inserted from above into the upper end portions 25 and 27 of the fixed column 13 and the movable column 17 arranged at the same height and prevents the movable column 17 from unfolding. This locking tool 31 is covered with the upper end of the folded ladder in the stowed state in the stowed state of the folding ladder as shown in FIGS. 1 (b), 2 (a), and 3 (a), and prevents the unfolding. The folding ladder can be unfolded by being removed as shown in FIGS. 2 (b) and 3 (b). The locking tool 31 and the upper end portions 25 and 27 are inserted in a direction opposite to the insertion direction (arrow b in FIG. 4) by a locking pin 33 in a direction (arrow b direction) orthogonal to the insertion direction (arrow a direction in FIG. 4). (c direction), that is, an engagement means 35 for restricting the removal of the locking tool 31 in the removal direction is provided.

係合手段３５は、固定柱１３及び可動柱１７の上端部２５，２７から挿入の方向と直交方向に突出する係止ピン３３と、係止具３１の内面に凹設され挿入方向に対し傾斜する斜め溝３７を有して係止ピン３３を受け入れる係合溝３９とからなる。この展開防止構造では、上端部２５，２７に挿入されている係止具３１を、引き抜きながら、係止ピン３３が斜め溝３７に沿って移動するように回転、本実施の形態では、一方向の回転ではなく、左右方向に振りながら上方へ引き、係合溝３９の形状、すなわち略Ｚ字状に沿って移動させることで、係止具３１の上階４１（図２参照）での取り外し性を低下させずに、階下（バルコニー床２３）からの取り外しを困難にできる。   The engaging means 35 includes a locking pin 33 that protrudes from the upper end portions 25 and 27 of the fixed column 13 and the movable column 17 in a direction orthogonal to the insertion direction, and is recessed in the inner surface of the locking tool 31 and is inclined with respect to the insertion direction. And an engaging groove 39 for receiving the locking pin 33. In this development preventing structure, the locking tool 31 inserted in the upper end portions 25 and 27 is rotated so that the locking pin 33 moves along the oblique groove 37 while being pulled out. Rotation is not performed, but is pulled upward while swinging in the left-right direction, and moved along the shape of the engagement groove 39, that is, substantially Z-shaped, so that the locking tool 31 is removed at the upper floor 41 (see FIG. 2). Removal from the downstairs (balcony floor 23) can be made difficult without deteriorating performance.

係止具３１の上端面４３には手掛け部４５が設けられ、手掛け部４５は逆Ｕ字形状に形成されて両下端が上端面４３に固着される。手掛け部４５が上端面４３に配設されていることで、上階４１からの操作性にのみ寄与し、階下からの操作性、すなわち、把持易さは向上されない。これにより、階下からの係止具３１の把持を困難にしつつ、上階４１での係止具３１の把持を容易にして操作性を高めることができる。   A handle 45 is provided on the upper end surface 43 of the locking tool 31, and the handle 45 is formed in an inverted U shape so that both lower ends are fixed to the upper end surface 43. Since the handle 45 is disposed on the upper end surface 43, it contributes only to the operability from the upper floor 41, and the operability from the lower floor, that is, the ease of gripping is not improved. Accordingly, it is difficult to grip the locking tool 31 from the lower floor, and the gripping of the locking tool 31 on the upper floor 41 can be facilitated to improve the operability.

図示は省略するが、係止具３１は、可撓性線体（鎖、ボールチェーン、ワイヤ等）で固定物（建物１１の壁面等）に締結されて、上端部２５，２７に着脱自在となることが望ましい。折り畳み梯子１００を展開するために、上端部２５，２７から係止具３１が脱着されても、係止具３１が可撓性線体を介して固定物に繋がれて、上端部２５，２７の傍らから離れない。これにより、上端部２５，２７から脱着された係止具３１の紛失を防止することができる。   Although not shown, the locking tool 31 is fastened to a fixed object (such as a wall surface of the building 11) with a flexible wire (chain, ball chain, wire, etc.) and is detachable from the upper ends 25, 27. It is desirable to become. Even if the locking tool 31 is detached from the upper end portions 25 and 27 in order to unfold the folding ladder 100, the locking tool 31 is connected to a fixed object via the flexible wire body, and the upper end portions 25 and 27. I will not leave my side. Thereby, the loss of the locking tool 31 detached from the upper end portions 25 and 27 can be prevented.

このように、上記の展開防止構造では、係止具３１が上方向でなければ引き抜けず、しかも、上端部２５，２７に対して、固定柱１３，可動柱１７の長手方向に真直に係止具３１が嵌合した取り付け状態ではないことで、単に挿入反対方向に抜こうとしても係止ピン３３にて抜脱が阻止され、上階４１での脱着操作性を低下させることなく、階下からの脱着が困難となる。   As described above, in the above-described development preventing structure, the locking tool 31 cannot be pulled out unless it is in the upward direction, and is directly engaged with the upper end portions 25 and 27 in the longitudinal direction of the fixed column 13 and the movable column 17. Since the stopper 31 is not in the fitted state, it is prevented from being pulled out by the locking pin 33 even if it is simply pulled out in the direction opposite to the insertion, so that the detachment operability on the upper floor 41 is not lowered, and from the lower floor. It becomes difficult to desorb.

発明に係る展開防止構造は、上記構造を基本として種々に変形して構成することができる。以下に、上記した展開防止構造の変形例を説明する。なお、各変形例において、図１〜図４に示した部材と同一の部材には同一の符号を付し、重複する説明は省略する。
図５は係止ピンが上端部に設けられた変形例の斜視図である。
この変形例に係る展開防止構造は、上端部２５，２７の内側に係止ピン３３が突設される。また、係止具３１Ａの内方には同軸の軸部５１が垂設され、この軸部５１の外周に、斜め溝３７を有した係合溝３９Ａが形成されている。つまり、係止ピン３３、係合溝３９Ａにて係合手段３５Ａが構成されている。このような構成によれば、係止ピン３３が外方に突出しておらず、固定柱１３及び可動柱１７の湾曲した外形を損なわず、上端部２５，２７を把持した際に、係止ピン３３が差し障ることがない。 The development preventing structure according to the invention can be configured in various modifications based on the above structure. Below, the modification of the above-mentioned expansion | deployment prevention structure is demonstrated. In addition, in each modification, the same code | symbol is attached | subjected to the member same as the member shown in FIGS. 1-4, and the overlapping description is abbreviate | omitted.
FIG. 5 is a perspective view of a modified example in which a locking pin is provided at the upper end.
In the development preventing structure according to this modification, a locking pin 33 projects from the inside of the upper end portions 25 and 27. In addition, a coaxial shaft portion 51 is provided inward of the locking tool 31 </ b> A, and an engagement groove 39 </ b> A having an oblique groove 37 is formed on the outer periphery of the shaft portion 51. That is, the engaging means 35A is configured by the locking pin 33 and the engaging groove 39A. According to such a configuration, the locking pin 33 does not protrude outward, the curved outer shapes of the fixed column 13 and the movable column 17 are not impaired, and the locking pin 33 is held when the upper ends 25 and 27 are gripped. 33 does not interfere.

図６は貫通係止ピンによる変形例の斜視図である。
この変形例に係る展開防止構造は、係合手段３５Ｂが、係止ピン５３と、ナット部材５９と、貫通穴６１とからなる。係止ピン５３は、固定柱１３及び可動柱１７の上端部２５，２７に挿入された係止具３１Ｂを、固定柱１３及び可動柱１７と共に貫通する。係止具３１Ｂの基端には大径把持部５５が固設され、大径把持部５５は係止ピン５３の貫通穴６１からの抜けを阻止する。ナット部材５９は、係止ピン５３の先端に形成されたネジ部５７に螺合される。 FIG. 6 is a perspective view of a modified example using a penetration locking pin.
In the development preventing structure according to this modification, the engaging means 35 </ b> B includes a locking pin 53, a nut member 59, and a through hole 61. The locking pin 53 penetrates the locking tool 31 </ b> B inserted into the upper ends 25 and 27 of the fixed column 13 and the movable column 17 together with the fixed column 13 and the movable column 17. A large-diameter gripping portion 55 is fixed to the proximal end of the locking tool 31B, and the large-diameter gripping portion 55 prevents the locking pin 53 from coming off from the through hole 61. The nut member 59 is screwed into a screw portion 57 formed at the tip of the locking pin 53.

大径把持部５５及びナット部材５９は、係止ピン５３が係止具３１Ｂを貫通した状態で両端に露出し、十分な外径と長さがあり、摘みやすく、また、ローレットなどを表面に形成して、回転操作を行いやすくしている。   The large-diameter gripping portion 55 and the nut member 59 are exposed at both ends in a state where the locking pin 53 penetrates the locking tool 31B, have a sufficient outer diameter and length, are easy to pick, and have a knurled surface on the surface. It is easy to perform rotation operation.

この変形例に係る展開防止構造によれば、ナット部材５９と大径把持部５５を両手で持って螺合解除し、係止ピン５３を挿入の方向と直交方向に抜き取った後に、係止具３１Ｂが上端部２５，２７から脱着可能となる。これにより、係止具３１Ｂの上階４１での取り外し性を低下させずに、階下からの取り外しを困難にできる。   According to the development preventing structure according to this modification, the nut member 59 and the large-diameter gripping portion 55 are held with both hands to be unscrewed, and after the locking pin 53 is pulled out in the direction orthogonal to the insertion direction, the locking tool 31B becomes removable from the upper end portions 25 and 27. Thereby, the removal from the lower floor can be made difficult without deteriorating the detachability on the upper floor 41 of the locking tool 31B.

図７は係止具に係止ピンが設けられた変形例の斜視図である。
この変形例に係る展開防止構造は、係止具３１Ｃの内面に係止ピン３３が突設され、この係止ピン３３に係合する係合溝３９Ｂが固定柱１３及び可動柱１７の上端部２５，２７に形成されている。つまり、係止ピン３３、係合溝３９Ｂにて係合手段３５Ｃが構成されている。この変形例では、係合溝３９Ｂは、上下一対の平行な縦溝６３，６５とこれらを接続する横溝６７とによりクランク形状に形成されている。 FIG. 7 is a perspective view of a modified example in which a locking pin is provided on the locking tool.
In the development preventing structure according to this modification, a locking pin 33 protrudes from the inner surface of the locking tool 31C, and an engagement groove 39B that engages with the locking pin 33 is formed at the upper end of the fixed column 13 and the movable column 17. 25, 27. That is, the engaging means 35 </ b> C is configured by the locking pin 33 and the engaging groove 39 </ b> B. In this modification, the engagement groove 39B is formed in a crank shape by a pair of upper and lower parallel vertical grooves 63, 65 and a horizontal groove 67 connecting them.

図８は踏桟が梯子左右方向の回動軸で連結される変形例に係る折り畳み梯子の収納状態を（ａ）、展開状態を（ｂ）で表した斜視図である。
展開防止構造の設けられる梯子は、角柱形状の固定柱１３Ｄ、可動柱１７Ｄからなり、固定柱１３Ｄ、可動柱１７Ｄの厚み方向で回動軸２１を介して踏桟１５Ａが連結される構造であってもよい。このような構造の折り畳み梯子１００Ａでは、固定柱１３Ｄ、可動柱１７Ｄ及び踏桟１５Ａを角柱状に収納することができる。この場合、係止具３１Ｄは、挿入反対方向に交差する方向の操作を、脱着前に必要とする例えば図７に示す係合手段３５Ｃと同様の係合手段によって係止する。 FIG. 8 is a perspective view of the folding ladder according to the modified example in which the pedestal is connected by a rotating shaft in the horizontal direction of the ladder, and (a) showing the stowed state and (b) showing the unfolded state.
The ladder provided with the unfolding prevention structure is composed of a prismatic fixed column 13D and a movable column 17D, and the step rail 15A is connected via a rotating shaft 21 in the thickness direction of the fixed column 13D and the movable column 17D. May be. In the folding ladder 100A having such a structure, the fixed column 13D, the movable column 17D, and the step bar 15A can be stored in a prismatic shape. In this case, the locking tool 31D locks the operation in the direction crossing the insertion opposite direction by the engaging means similar to the engaging means 35C shown in FIG.

したがって、上記折り畳み梯子１００の展開防止構造によれば、同一高さに配置された固定柱１３及び可動柱１７の上端部２５，２７に着脱自在に挿入されて可動柱１７の展開を阻止する係止具３１を備え、係止具３１と上端部２５，２７には、挿入の方向と直交方向の係止ピン３３にて挿入反対方向の係止具３１の抜脱を規制する係合手段３５を設けたので、係止具３１が上方向でなければ引き抜けず、しかも、単に挿入反対方向に抜こうとしても係止ピン３３にて抜脱が阻止され、上階４１での脱着操作性を低下させることなく、階下からの脱着は困難にできる。これにより、外観意匠を損なわず、緊急時の展開は容易に行えるとともに、階下からの展開は困難にできる。この結果、見栄え、緊急対応性を低下させずに、防犯性を向上させることができる。   Therefore, according to the unfolding prevention structure for the folding ladder 100, the fixed column 13 and the upper end portions 25, 27 of the movable column 17 arranged at the same height are detachably inserted to prevent the movable column 17 from unfolding. An engaging means 35 is provided with a stopper 31, and the locking tool 31 and the upper end portions 25, 27 are controlled by a locking pin 33 in a direction orthogonal to the insertion direction to restrict the locking tool 31 in the direction opposite to the insertion direction. Therefore, if the locking tool 31 is not in the upward direction, it cannot be pulled out, and even if it is simply pulled out in the direction opposite to the insertion direction, the locking pin 33 is prevented from being pulled out, and the detachment operability on the upper floor 41 is improved. Without lowering, it can be difficult to detach from the downstairs. As a result, the appearance design is not impaired, and the emergency development can be easily performed, and the development from the downstairs can be made difficult. As a result, crime prevention can be improved without deteriorating appearance and emergency response.

なお、折り畳み梯子１００は、可動柱１７を収納する際に、凹凸係止構造等により、節度感（クリック感）が生じるように構成してもよい。このような構成によれば、可動柱１７の収納時に、可動柱１７が固定柱１３に沿う状態が保持される。
また、折り畳み梯子１００は、壁面に縦溝を形成し、この縦溝内に設置することで、壁面内に収納されるようにしてもよい。このような構成とすることで、折り畳み梯子１００を、建物の外壁などとの意匠性に合せることが可能となる。
さらに、折り畳み梯子１００は、固定柱１３が、バルコニーの柱を兼ね、例えば、柱内に収納されるような構造としてもよい。
また、折り畳み梯子１００は、固定柱１３が、窓等のシャッターの縦ガイドレール或いはガイドレールを支持する縦枠を兼ねる構造としてもよい。
さらに、上述した各実施の形態において、係合溝３９，３９Ａ，３９Ｂの形状について述べたが、この係合溝の形状は、防犯性と取り外し操作性とを好適に有する形状であれば上記形状の限りではなく、これら防犯性と操作性の優先度合いの要請に応じて他の形状とすることも可能である。 Note that the folding ladder 100 may be configured such that when the movable column 17 is housed, a feeling of moderation (clicking feeling) is generated due to an uneven locking structure or the like. According to such a configuration, when the movable column 17 is stored, the state in which the movable column 17 is along the fixed column 13 is maintained.
Further, the folding ladder 100 may be accommodated in the wall surface by forming a vertical groove on the wall surface and installing in the vertical groove. With such a configuration, the folding ladder 100 can be matched with the design characteristics of the outer wall of the building and the like.
Further, the folding ladder 100 may have a structure in which the fixed pillar 13 serves as a balcony pillar and is accommodated in the pillar, for example.
Further, the folding ladder 100 may have a structure in which the fixed column 13 also serves as a vertical guide rail of a shutter such as a window or a vertical frame that supports the guide rail.
Further, in each of the above-described embodiments, the shape of the engagement grooves 39, 39A, 39B has been described. However, the shape of the engagement grooves is preferably the above shape as long as it has a crime prevention property and a removal operability. However, it is possible to adopt other shapes according to the request for the priority of crime prevention and operability.

本発明に係る展開防止構造を備えた折り畳み梯子の展開状態を（ａ）、収納状態を（ｂ）で表した上部斜視図である。It is the upper perspective view which expressed the unfolded state of the folding ladder provided with the unfolding prevention structure concerning the present invention by (a) and the stowed state by (b). 図１に示した折り畳み梯子の収納状態を（ａ）、展開状態を（ｂ）で表した正面図である。It is the front view which represented the accommodation state of the folding ladder shown in FIG. 1 at (a), and the unfolded state at (b). 変形例に係る分割型折り畳み梯子の収納状態を（ａ）、展開状態を（ｂ）で表した正面図である。It is the front view which represented the accommodation state of the division | segmentation type folding ladder concerning a modification with (a), and the unfolded state by (b). 上端部と係止具の分解斜視図である。It is a disassembled perspective view of an upper end part and a locking tool. 係止ピンが上端部に設けられた変形例の斜視図である。It is a perspective view of the modification with which the latching pin was provided in the upper end part. 貫通係止ピンによる変形例の斜視図である。It is a perspective view of the modification by a penetration locking pin. 係止具に係止ピンが設けられた変形例の斜視図である。It is a perspective view of the modification in which the locking pin was provided in the locking tool. 踏桟が梯子左右方向の回動軸で連結される変形例に係る折り畳み梯子の収納状態を（ａ）、展開状態を（ｂ）で表した斜視図である。It is the perspective view which expressed the stowed state of the folding ladder which concerns on the modification with which a crosspiece is connected with the rotating shaft of a ladder left-right direction, and expressed the unfolded state by (b).

符号の説明Explanation of symbols

１１…建物
１３…固定柱
１５…踏桟
１５ａ…一端
１５ｂ…他端
１７…可動柱
２５…固定柱の上端部
２７…可動柱の上端部
３１…係止具
３３…係止ピン
３５…係合手段
３７…斜め溝
３９…係合溝
４３…係止具の上端面
４５…手掛け部
５５…大径把持部
５９…ナット部材
６１…貫通穴
１００…折り畳み梯子
ｂ…挿入の方向と直交方向
ｃ…挿入反対方向 DESCRIPTION OF SYMBOLS 11 ... Building 13 ... Fixed pillar 15 ... Foot cross 15a ... One end 15b ... Other end 17 ... Movable pillar 25 ... Upper end part of fixed pillar 27 ... Upper end part of movable pillar 31 ... Locking tool 33 ... Locking pin 35 ... Engagement Means 37 ... Diagonal groove 39 ... Engagement groove 43 ... Upper end surface of the locking tool 45 ... Handle part 55 ... Large-diameter gripping part 59 ... Nut member 61 ... Through hole 100 ... Folding ladder b ... Direction perpendicular to the insertion direction c ... Insertion opposite direction

Claims (5)

建物に固定される固定柱と、該固定柱に一端が回動自在に固定された複数の踏桟の他端に回動自在に固定され前記固定柱に対して上下方向に平行移動して収納及び展開される可動柱と、を備えてなる折り畳み梯子の展開防止構造であって、
前記可動柱は、前記収納の位置で前記固定柱に沿って近接するとともに、上端部が前記固定柱の上端部と同一高さに配置され、
同一高さに配置された該固定柱及び該可動柱の上端部に上方から着脱自在に挿入されて前記可動柱の展開を阻止する係止具を備え、
該係止具と前記上端部には前記挿入の方向と直交方向の係止ピンにて挿入反対方向の前記係止具の抜脱を規制する係合手段が設けられたことを特徴とする折り畳み梯子の展開防止構造。 A fixed column fixed to the building, and a fixed column that is pivotally fixed to the other end of a plurality of step bars fixed at one end to the fixed column. And a deployable prevention structure for the folding ladder comprising:
The movable column is close along the fixed column at the storage position, and the upper end is disposed at the same height as the upper end of the fixed column,
The fixed column disposed at the same height and a locking tool that is detachably inserted from above into the upper end of the movable column and prevents the movable column from expanding,
Folding characterized in that the locking means and the upper end portion are provided with engaging means for restricting removal of the locking tool in the direction opposite to the insertion direction by a locking pin orthogonal to the insertion direction. Ladder expansion prevention structure. 前記係合手段が、
前記固定柱及び前記可動柱の上端部から前記挿入の方向と直交方向に突出する前記係止ピンと、
前記係止具に凹設され前記挿入方向に対し傾斜する斜め溝を有して該係止ピンを受け入れる係合溝と、
からなることを特徴とする請求項１記載の折り畳み梯子の展開防止構造。 The engaging means is
The locking pin protruding from the upper end of the fixed column and the movable column in a direction orthogonal to the insertion direction;
An engagement groove that is recessed in the locking tool and has an oblique groove that is inclined with respect to the insertion direction, and receives the locking pin;
2. The folding ladder unfolding prevention structure according to claim 1, characterized by comprising: 前記係合手段が、
前記固定柱及び前記可動柱の上端部に挿入された前記係止具を、前記固定柱及び前記可動柱と共に貫通する前記係止ピンと、
該係止ピンの基端に固設され貫通穴からの抜けを阻止する大径把持部と、
前記係止ピンの先端に螺合されるナット部材と、
からなることを特徴とする請求項１記載の折り畳み梯子の展開防止構造。 The engaging means is
The locking pin inserted through the fixed column and the movable column together with the fixed column and the movable column;
A large-diameter gripping portion fixed to the base end of the locking pin to prevent the locking pin from coming off;
A nut member screwed onto the tip of the locking pin;
2. The folding ladder unfolding prevention structure according to claim 1, characterized by comprising: 前記係止具の上端面に、手掛け部が設けられたことを特徴とする請求項１又は２又は３記載の折り畳み梯子の展開防止構造。   The folding preventing structure for folding ladders according to claim 1, wherein a handle portion is provided on an upper end surface of the locking tool. 前記係止具が、可撓性線体で固定物に締結されて前記上端部に着脱自在となったことを特徴とする請求項１，２，３，４のいずれか１つに記載の折り畳み梯子の展開防止構造。   The folding device according to any one of claims 1, 2, 3, and 4, wherein the locking member is fastened to a fixed object by a flexible wire and is detachable from the upper end portion. Ladder expansion prevention structure.
JP2008191097A 2008-07-24 2008-07-24 Deployment preventing structure for retractable ladder Pending JP2010024799A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2473961A (en) * 2009-09-28 2011-03-30 Fire Escapes A folding ladder
KR101672005B1 (en) * 2015-04-23 2016-11-02 삼성중공업 주식회사 Handrail
CN106948594A (en) * 2017-04-20 2017-07-14 黑龙江建筑职业技术学院 All suspension cat ladders and making, application method during civil engineering work building
CN107250479A (en) * 2014-12-02 2017-10-13 科尔分配股份有限公司 Folding ladder
US10233692B2 (en) 2014-12-02 2019-03-19 Core Distribution, Inc. Foldable ladder
US10753149B2 (en) 2008-08-22 2020-08-25 Core Distribution, Inc. Extendable / retractable ladder
US11174678B2 (en) 2017-11-08 2021-11-16 Core Distribution, Inc. Locking assembly for a telescoping ladder
US11795760B2 (en) 2019-10-24 2023-10-24 Core Distribution, Inc. Ladder tripod assembly and system

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10753149B2 (en) 2008-08-22 2020-08-25 Core Distribution, Inc. Extendable / retractable ladder
GB2473961A (en) * 2009-09-28 2011-03-30 Fire Escapes A folding ladder
EP2305945A1 (en) * 2009-09-28 2011-04-06 Fire Escapes (Europe) Limited Folding ladders
CN107250479A (en) * 2014-12-02 2017-10-13 科尔分配股份有限公司 Folding ladder
US10233692B2 (en) 2014-12-02 2019-03-19 Core Distribution, Inc. Foldable ladder
US10731413B2 (en) 2014-12-02 2020-08-04 Core Distribution, Inc. Foldable ladder
KR101672005B1 (en) * 2015-04-23 2016-11-02 삼성중공업 주식회사 Handrail
CN106948594A (en) * 2017-04-20 2017-07-14 黑龙江建筑职业技术学院 All suspension cat ladders and making, application method during civil engineering work building
US11174678B2 (en) 2017-11-08 2021-11-16 Core Distribution, Inc. Locking assembly for a telescoping ladder
US11795760B2 (en) 2019-10-24 2023-10-24 Core Distribution, Inc. Ladder tripod assembly and system

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