JP4580346B2

JP4580346B2 - Telescopic ladder

Info

Publication number: JP4580346B2
Application number: JP2006005581A
Authority: JP
Inventors: 守廣田
Original assignee: Alinco Inc
Current assignee: Alinco Inc
Priority date: 2006-01-13
Filing date: 2006-01-13
Publication date: 2010-11-10
Anticipated expiration: 2026-01-13
Also published as: JP2007186898A

Description

本発明は、両側一対の筒状側枠部材と両側枠部材の上端部間に横架される踏み桟とで門形に形成されて上下複数段に配置される門形梯子部材の側枠部材どうしを入れ子式に嵌合して伸縮自在とした伸縮梯子の改良に関するものである。 The present invention relates to a side frame member of a gate-type ladder member which is formed in a gate shape by a pair of cylindrical side frame members on both sides and a step bar horizontally mounted between upper end portions of both side frame members and arranged in a plurality of upper and lower stages. The present invention relates to an improvement of a telescopic ladder that can be telescopically fitted with each other in a nested manner.

図６の(a) は従来のアルミ製の伸縮梯子Ｂを伸張状態で示す斜視図、(b) は同伸縮梯子Ｂを収縮状態で示す斜視図であり、図７は収縮状態における伸縮梯子Ｂの例えば下から２番目〜４番目の門形梯子部材１₂〜１₄の一部拡大断面図である。この伸縮梯子Ｂは、各門形梯子部材１₁〜１_nが両側一対の筒状側枠部材２₁〜２_n，２₁〜２_nと両側枠部材２₁〜２_n，２₁〜２_nの上端部に横架連結された踏み桟３₁〜３_nとからなるもので、各踏み桟３₁〜３_nの両端部は、両側枠部材２₁〜２_n，２₁〜２_nの夫々上端部に嵌合固定された踏み桟取付用短管部材４₁〜４_nに一体的に連結されており、各踏み桟取付用短管部材４₁〜４_nの下端側には、梯子収縮時に上下に隣り合う短管部材４₁〜４_nどうしが衝当する際の衝撃を緩和するためのゴム製の衝撃緩和用リング５₁〜５_nが側枠部材２₁〜２_nに嵌合して取り付けられている。尚、一番下の門形梯子部材１₁には両側枠部材２₁，２₁の下端部に踏み桟３₀が取り付けられている。 6 (a) is a perspective view showing a conventional aluminum telescopic ladder B in an expanded state, FIG. 6 (b) is a perspective view showing the telescopic ladder B in a contracted state, and FIG. 7 is a telescopic ladder B in the contracted state. FIG. _{5 is} a partially enlarged cross-sectional view of the second to fourth portal ladder members 1 ₂ to 14 from the bottom, for example. In this telescopic ladder B, each of the portal ladder members 1 ₁ to 1 _n is a pair of cylindrical side frame members 2 ₁ to 2 _n and 2 ₁ to 2 _n and both side frame members 2 ₁ to 2 _n and 2 ₁ to 2. _n is composed of tread bars 3 _{1 to} 3 _n that are horizontally connected to the upper end of _n , and both end portions of each of the tread bars 3 _{1 to} 3 _n are both side frame members 2 ₁ to 2 _n and 2 ₁ to 2 _n. Are integrally connected to the treadle-mounting short pipe members 4 ₁ to 4 _n that are fitted and fixed to the upper end of each of the treadles, and at the lower end side of each of the treadle-mounting short pipe members 4 ₁ to 4 _n , Rubber shock-reducing rings 5 _{1 to} 5 _n are formed on the side frame members 2 ₁ to 2 _n to relieve shock when the short pipe members 4 ₁ to 4 _n adjacent to each other collide with each other when the ladder contracts. It is fitted and attached. Incidentally, crosspiece 3 ₀ stepping to the lower end of each side frame member 2 _1, 2 ₁ is attached to the portal ladder member 1 ₁ of the bottom.

各門形梯子部材１₁〜１_nには各踏み桟３₁〜３_nの両端部に、梯子伸張時に上段側梯子部材の踏み桟と下段側の踏み桟とを一定間隔に保持するためのストッパー手段９が設けられている。このストッパー手段９は、各踏み桟３₁〜３_n内部をスライドするスライダー１１にストッパーピン１２を一体的に取り付け、このピン１２の先端部１２ａが各短管部材４₁〜４_nの開口部１３を通って各側枠部材２₁〜２_nのピン挿通孔１４から突出するように付勢するコイルバネ１５を、スライダー１１と、各踏み桟３₁〜３_nに固定されたピンガイド１６との間に介装したもので、各踏み桟３₁〜３_nの正面側にはスライダー１１をコイルバネ１５の付勢力に抗してスライド操作する操作片１７（仮想線図示）が設けてある。この操作片１７は、取付軸１８（仮想線図示）によってスライダー１１に取り付けられ、この取付軸１８は各踏み桟３₁〜３_nの前側壁に貫設された長孔１９（仮想線図示）に挿通されている。 Each gate-shaped ladder member 1 ₁ to 1 _n is provided at both ends of each of the step bars 3 _{1 to} 3 _n to hold the step bars of the upper ladder member and the lower step bars at regular intervals when the ladder is extended. Stopper means 9 is provided. The stopper means 9 has a stopper pin 12 integrally attached to a slider 11 that slides inside the step bars 3 _{1 to} 3 _n , and a tip 12 a of the pin 12 is an opening of each short tube member 4 ₁ to 4 _n . 13, a coil spring 15 that urges the side frame members 2 ₁ to 2 _n so as to protrude from the pin insertion holes 14 of the side frame members 2 ₁ to 2 _n , a slider 11, and a pin guide 16 fixed to each of the step bars 3 _{1 to} 3 _n An operation piece 17 (shown in phantom line) is provided on the front side of each of the step bars 3 _{1 to} 3 _n to slide the slider 11 against the urging force of the coil spring 15. The operating piece 17 is attached to the slider 11 by an attachment shaft 18 (illustrated phantom line). The attachment shaft 18 is a long hole 19 (illustrated imaginary line) that is provided in the front side wall of each of the step bars 3 _{1 to} 3 _n. Is inserted.

梯子Ｂが伸縮している時は、図７の例えば梯子部材１₃側のストッパーピン１２について説明すると、ストッパーピン１２の先端部１２ａは、側枠部材２₃のピン挿通孔１４から突出するが、上段側の梯子部材１₄の側枠部材２₄に当接した状態にある。しかして、梯子伸張時に最上段の門形梯子部材１_nの踏み桟３_nを引き上げてゆくと、上から２段目の梯子部材のストッパーピン１２の先端部１２ａが最上段の梯子部材１_nの側枠部材２_nの下端部に設けてある係止用ピン孔（図示省略）に突入してロックされ、それにより上から２段目の梯子部材が引っ張られて上から３段目の梯子部材のストッパーピン１２の先端部１２ａが上から２段目の梯子部材の側枠部材下端部の係止用ピン孔（図示省略）に突入してロックされ、以降同様にして順次図６の(a) に示すような伸張状態となる。 When the ladder B is stretchable is, to describe the stopper pin 12, for example, a ladder member 1 ₃ side of FIG. 7, the distal end portion 12a of the stopper pin 12 is protruded from the pin insertion hole 14 of the side frame member 2 ₃ , the side frame member 2 ₄ of the upper side ladder member 1 ₄ in contact with the state. Thus, when the time of the ladder extension Yuku raising the stepping crosspiece 3 _n of the uppermost portal ladder member 1 _n, ladders member 1 of the distal end portion 12a of the stopper pin 12 of the second-stage ladder member from above the uppermost _n Is inserted into a locking pin hole (not shown) provided at the lower end of the side frame member 2 _n and locked, whereby the second-stage ladder member is pulled from the top, and the third-stage ladder from the top. The distal end portion 12a of the stopper pin 12 of the member enters and locks into a locking pin hole (not shown) at the lower end portion of the side frame member of the ladder member in the second stage from the top. It will be in the extended state as shown in a).

図６の(a) に示す伸張状態から(b) に示す収縮状態に折り畳む時は、最下段側梯子部材１₁の踏み桟３₁にある操作片１７をコイルバネ１５に抗してスライド操作させて、ストッパーピン１２をロック解除すれば、下から２番目の梯子部材１₂の側枠部材２₂が最下段側梯子部材１₁の側枠部材２₁内に落ち込んで下から２番目の梯子部材１₂が最下段の梯子部材１₁に折り畳まれる。以降同様な操作を行って順次折り畳むことにより、図６の(b) に示す収縮状態となる。 When folding the contracted state shown from the extended state shown in FIG. 6 (a) to (b) is an operation piece 17 in the stepping crosspiece 3 ₁ of the bottom side ladder member 1 ₁ is slid against the coil spring 15 Te, when unlocking the stopper pin 12, the second lowest depressed to the second ladder member 1 ₂ of the side frame member 2 ₂ is lowermost side ladder member 1 ₁ of the side frame member 2 in ₁ from the bottom ladder member 1 ₂ is folded in a ladder member 1 ₁ of the bottom. Thereafter, similar contraction is performed to sequentially fold, and the contracted state shown in FIG.

上記従来の伸縮梯子Ｂは、図７に示すように、梯子収縮時において上下に隣り合う門形梯子部材１₁〜１_nの踏み桟３₂〜３₄相互間の間隔ｓが６ｍｍと狭いため、図６の(a)
に示す伸張状態から(b) に示す収縮状態に折り畳み収縮作業を行う際に、上下に隣り合う踏み桟と踏み桟との間で作業者の手指を挟むことがあり、特に下段側における折り畳み収縮作業ではその上方側にある多数段の門形梯子部材によって相当な荷重が作用することから、非常に危険であった。 As shown in FIG. 7, the conventional telescopic ladder B has a narrow space s between the step bars 3 _{2 to} 3 _{4 of the} portal ladder members 1 ₁ to 1 _n adjacent to each other when the ladder is contracted, as narrow as 6 mm. Fig. 6 (a)
When performing the folding and shrinking work from the stretched state shown in (b) to the contracted state shown in (b), the operator's fingers may be pinched between the stepped bars adjacent to each other in the vertical direction. The work was very dangerous because a considerable load was applied by the multi-stage portal ladder members on the upper side.

本発明は、上記のような課題に鑑みてなされたもので、梯子収縮時における指詰め防止を図り、梯子伸縮作業を安全に行えるようにした伸縮梯子を提供することを目的とする。 The present invention has been made in view of the above problems, and an object of the present invention is to provide a telescopic ladder capable of preventing the stuffing of the fingers when the ladder is contracted and performing the ladder telescopic work safely.

上記課題を解決するための手段を、後述する実施形態の参照符号を付して説明すると、請求項１に係る発明は、両側一対の筒状側枠部材２₁ 〜２_n ，２₁ 〜２_n と両側枠部材２₁ 〜２_n ，２₁ 〜２_n の上端部間に横架される踏み桟３₁ 〜３_n とで門形に形成されて上下複数段に配置される門形梯子部材１₁ 〜１_n の側枠部材２₁ 〜２_n どうしを入れ子式に嵌合してなる伸縮梯子において、梯子収縮時に上下に隣り合う門形梯子部材１₁ 〜１_n の踏み桟３₁ 〜３_n 間で作業者の指を詰めるのを防止するためにその指詰め防止に必要な踏み桟３₁ 〜３_n 間の間隔Ｓを保持する間隔保持手段６を設け、該間隔保持手段６は、各門形梯子部材１ ₁ 〜１ _n の各側枠部材２ ₁ 〜２ _n 上端部に嵌合固定される踏み桟取付用短管部材４ ₁ 〜４ _n の上端部又は下端部を指詰め防止に必要な踏み桟３ ₁ 〜３ _n 間の間隔Ｓが確保されるように上方又は下方へ所要長さだけ延長することによって形成された延長管部７からなることを特徴とする。 Means for solving the above problems will be described with reference numerals in the embodiments described later. The invention according to claim 1 is a pair of cylindrical side frame members 2 ₁ to 2 _n and 2 ₁ to 2 on both sides. portal ladder arranged in a plurality of vertical stages are formed in a gate shape in stepping crosspiece 3 ₁ to 3 _n are laterally placed between _n and both side frame members 2 ₁ to 2 _n, 2 ₁ to 2 _n of the upper portion member 1 ₁ to 1 _n side members 2 ₁ How to 2 _n in the telescopic ladder consisting fitted telescopically to the, stepping the portal ladder member 1 ₁ to 1 _n vertically adjacent when the ladder contraction crosspiece 3 ₁ the interval holding means 6 for holding the spacing S between to 3 between _n in order to prevent the stuffing workers fingers stepping required for its pinched fingers prevent flying bridge 3 ₁ to 3 _n provided, said distance holding means 6 is the upper portion or a lower end portion of each side frame member 2 ₁ to 2 _n upper end portion to the fitting fixed to the depressed桟取short pipe member 4 ₁ to 4 _n for with each portal ladder member 1 ₁ to 1 _n finger It is characterized by comprising an extension pipe portion 7 formed by extending upward or downward by a required length so as to ensure an interval S between the tread bars 3 _{1 to} 3 _n necessary for preventing filling .

請求項２は、両側一対の筒状側枠部材２ ₁ 〜２ _n ，２ ₁ 〜２ _n と両側枠部材２ ₁ 〜２ _n ，２ ₁ 〜２ _n の上端部間に横架される踏み桟３ ₁ 〜３ _n とで門形に形成されて上下複数段に配置される門形梯子部材１ ₁ 〜１ _n の側枠部材２ ₁ 〜２ _n どうしを入れ子式に嵌合してなる伸縮梯子において、梯子収縮時に上下に隣り合う門形梯子部材１ ₁ 〜１ _n の踏み桟３ ₁ 〜３ _n 間で作業者の指を詰めるのを防止するためにその指詰め防止に必要な踏み桟３ ₁ 〜３ _n 間の間隔Ｓを保持する間隔保持手段６を設け、該間隔保持手段６は、各門形梯子部材１ ₁ 〜１ _n の各側枠部材２ ₁ 〜２ _n 上端部に嵌合固定される踏み桟取付用短管部材４ ₁ 〜４ _n の下端又は上端に一端が接するように各側枠部材２ ₁ 〜２ _n に嵌合される衝撃緩和用リング１５ ₁ 〜１５ _n であって、指詰め防止に必要な踏み桟３ ₁ 〜３ _n 間の間隔Ｓが確保されるようにリング幅が拡張された衝撃緩和用リング１５ ₁ 〜１５ _n からなることを特徴とする。 The second aspect of the present invention provides a step rail horizontally mounted between a pair of cylindrical side frame members 2 ₁ to 2 _n , 2 ₁ to 2 _n and both side frame members 2 ₁ to 2 _n and 2 ₁ to 2 _n. 3 ₁ to 3 _n and with fitted and if side members 2 ₁ to 2 _n of the portal ladder member 1 ₁ to 1 _n, which is formed in a gate shape are formed above and below a plurality of stages telescopically formed by stretching ladder in, stepping the portal ladder member 1 ₁ to 1 _n vertically adjacent when the ladder contraction crosspiece 3 ₁ to 3 _n between stepping necessary for its pinched fingers prevented in order to prevent the stuffing workers fingers crosspiece 3 Interval holding means 6 for holding the interval S between _{1 to} 3 _n is provided, and the interval holding means 6 is fitted to the upper end portions of the side frame members 2 ₁ to 2 _{n of the} portal ladder members ₁₁ to 1 _n. met fixed is depressed cushioning ring 15 ₁ to 15 _n which are fitted to each side frame member 2 ₁ to 2 _n as one end is in contact with the bottom or top of the short pipe member 4 ₁ to 4 _n for w桟取 Finger Ring width so that the distance S between the tread crosspiece 3 ₁ to 3 _n required for prevention is reserved extended the shock-absorbing ring 15 ₁ to 15 _n It is characterized by comprising.

上記解決手段による発明の効果を、後述する実施形態の参照符号を付して説明すると、請求項１に係る発明によれば、梯子収縮時に上下に隣り合う門形梯子部材１₁〜１_nの踏み桟３₁〜３_n間で作業者の指を詰めるのを防止するためその指詰め防止に必要な踏み桟３₁〜３_n相互間の間隔Ｓを保持する間隔保持手段６を各門形梯子部材１₁〜１_nに設けていることから、この梯子Ａを伸張状態から収縮状態に折り畳み収縮作業を行う際に、上下に隣り合う踏み桟３₁〜３_n相互間で作業者の手指を挟むことがなくなり、その折り畳み収縮作業を安全に行うことができる。 The effect of the invention by the above-described solution means will be described with reference numerals of the embodiments described later. According to the invention according to claim 1, when the ladder contracts, the portal ladder members 1 ₁ to 1 _n adjacent to each other vertically stepping crosspiece 3 ₁ to 3 _n to prevent the pack operator's fingers between stepping required for its pinched fingers prevent flying bridge 3 ₁ to 3 _n each portal apart holding means 6 for holding the spacing S between each other Since the ladder members 1 ₁ to 1 _n are provided, when the ladder A is folded from the extended state to the contracted state and the contraction operation is performed, the fingers of the operator are placed between the step bars 3 _{1 to} 3 _n adjacent to each other vertically. And the folding contraction work can be performed safely.

また本発明によれば、間隔保持手段６は、各門形梯子部材１₁ 〜１_n の各側枠部材２₁ 〜２_n 上端部に嵌合固定される踏み桟取付用短管部材４₁ 〜４_n の上端部又は下端部を指詰め防止に必要な踏み桟間の間隔Ｓが確保されるように上方又は下方へ所要長さだけ延長することによって形成された延長管部７からなるため、踏み桟取付用短管部材４₁ 〜４_n の製作時には各踏み桟取付用短管部材４₁ 〜４_n の上端部を所要長さ上方へ延設すればよいから、製作が容易となる。 Further , according to the present invention , the distance holding means 6 is provided with the short beam member 4 ₁ for attaching the tread bar which is fitted and fixed to the upper ends of the side frame members 2 ₁ to 2 _{n of the} portal ladder members 1 ₁ to 1 _n. Because the upper end portion or the lower end portion of .about.4 _n consists of an extension pipe portion 7 formed by extending the upper portion or the lower portion by a required length so as to secure a space S between treads necessary for preventing finger filling. since it is sufficient tread extending the short pipe member 4 ₁ to 4 _n during fabrication for with桟取the upper end of the short pipe member 4 ₁ to 4 _n for with each stepping桟取to required length above, it becomes easy manufacture .

請求項２に係る発明によれば、両側一対の筒状側枠部材２ ₁ 〜２ _n ，２ ₁ 〜２ _n と両側枠部材２ ₁ 〜２ _n ，２ ₁ 〜２ _n の上端部間に横架される踏み桟３ ₁ 〜３ _n とで門形に形成されて上下複数段に配置される門形梯子部材１ ₁ 〜１ _n の側枠部材２ ₁ 〜２ _n どうしを入れ子式に嵌合してなる伸縮梯子において、梯子収縮時に上下に隣り合う門形梯子部材１ ₁ 〜１ _n の踏み桟３ ₁ 〜３ _n 間で作業者の指を詰めるのを防止するためにその指詰め防止に必要な踏み桟３ ₁ 〜３ _n 間の間隔Ｓを保持する間隔保持手段６を設け、該間隔保持手段６が、各門形梯子部材１₁ 〜１_n の各側枠部材２₁ 〜２_n 上端部に嵌合固定される踏み桟取付用短管部材４₁ 〜４_n の下端又は上端に一端が接するよう各側枠部材２₁ 〜２_n に嵌合される衝撃緩和用リング１５₁ 〜１５_n であって、指詰め防止に必要な踏み桟３₁ 〜３_n 間の間隔Ｓが確保されるようにリング幅の拡張された衝撃緩和用リング１５₁ 〜１５_n からなるものによれば、従来使用されている伸縮梯子にリング幅の拡張された衝撃緩和用リング１５₁ 〜１５_n を取り付ければよいから、従来の伸縮梯子をそのまま利用できる利点がある。 According to the second aspect of the present invention, the pair of cylindrical side frame members 2 ₁ to 2 _n , 2 ₁ to 2 _n on both sides and the side frame members 2 ₁ to 2 _n , 2 ₁ to 2 _n are horizontally disposed between the upper ends thereof. fitting was what side members 2 ₁ to 2 _n of the portal ladder member 1 ₁ to 1 _n, which are formed above and below a plurality of stages formed in a gate-shaped telescopically stepping crosspiece 3 ₁ to 3 _n are racks In order to prevent the operator's fingers from being jammed between the stepping bars 3 _{1 to} 3 _{n of the} portal ladder members 11 ₁ to 1 _n adjacent to each other when the ladder contracts , the interval holding means 6 for holding the spacing S between stepping necessary crosspiece 3 ₁ to 3 _n provided, said distance holding means 6, the side members 2 ₁ to 2 _n of the portal ladder member 1 ₁ to 1 _n Shock mitigating rings 15 ₁ to 15 _n fitted to the side frame members 2 ₁ to 2 _n so that one end is in contact with the lower end or the upper end of the short pipe members 4 ₁ to 4 _n fitted and fixed to the upper ends. 15 _n There, according to those composed of extended cushioning rings 15 ₁ to 15 _n of the ring width to spacing S between stepping crosspiece 3 ₁ to 3 _n required pinched fingers prevention is secured, conventionally used Since it is only necessary to attach the impact relaxation rings 15 ₁ to 15 _n having an expanded ring width to the extendable ladder, the conventional extendable ladder can be used as it is.

以下に本発明の好適な実施形態を図面に基づいて説明すると、図１は本発明に係る伸縮梯子Ａを収縮状態で示す正面図、図２の(a) は図１のＸ−Ｘ線断面図、(b) は(a) の矢印Ｙで示す部分の拡大図、図３は縮状態における伸縮梯子Ａの例えば下から２番目〜４番目の門形梯子部材１₂〜１₄の一部拡大断面図である。 A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a telescopic ladder A according to the present invention in a contracted state, and FIG. FIG, (b) is an arrow Y enlarged view of a portion indicated by, 3 second to 4 th portal ladder member 1 part of _2-1 ₄ from the bottom for example telescopic ladder a in the contraction state of (a) It is an expanded sectional view.

この伸縮梯子Ａは、図６、図７に示す従来の伸縮梯子Ｂと同様に、各門形梯子部材１₁〜１_nが、両側一対の筒状側枠部材２₁〜２_n，２₁〜２_nと、両側枠部材２₁〜２_n，２₁〜２_nの上端部に横架連結した踏み桟３₁〜３_nとからなるもので、各踏み桟３₁〜３_nの両端部は、両側枠部材２₁〜２_n，２₁〜２_nの夫々上端部に嵌合固定された踏み桟取付用短管部材４₁〜４_nに一体的に連結されていて、各踏み桟取付用短管部材４₁〜４_nの下端側には、梯子収縮時に上下に隣り合う短管部材４₁〜４_nどうしが衝当する際の衝撃を緩和するためのゴム製の衝撃緩和用リング５₁〜５_nが側枠部材２₁〜２_nに嵌合して取り付けられている。 In this telescopic ladder A, as in the conventional telescopic ladder B shown in FIGS. 6 and 7, each of the portal ladder members 1 ₁ to 1 _n includes a pair of cylindrical side frame members 2 ₁ to 2 _n and 2 _1. to 2 _n and, made of the linked stepping crosspiece 3 ₁ to 3 _n laterally placed on the upper end of each side frame member _{_{_{2 1 ~2 n, 2 1 ~2}}} n, both ends of each stepping bar 3 ₁ to 3 _n Are integrally connected to the short beam members 4 ₁ to 4 _n for attaching the step bars, which are fitted and fixed to the upper ends of the two side frame members 2 ₁ to 2 _n and 2 ₁ to 2 _n , respectively. On the lower end side of the short pipe members 4 ₁ to 4 _n for mounting the rails, a rubber shock buffer is used to reduce the shock when the short pipe members 4 ₁ to 4 _n adjacent to each other hit the top and bottom when the ladder contracts. The rings 5 _{1 to} 5 _n are fitted and attached to the side frame members 2 ₁ to 2 _n .

そして、この伸縮梯子Ａが従来の伸縮梯子Ｂと異なるところは、梯子収縮時に上下に隣り合う門形梯子部材１₁〜１_nの踏み桟３₁〜３_n間で作業者の指を詰めるのを防止するためにその指詰め防止に必要な踏み桟３₁〜３_n相互間の間隔Ｓを保持する間隔保持手段６を各門形梯子部材１₁〜１_nに設けたことである。 And this telescopic ladder A is different from the conventional telescopic ladder B in that the operator's fingers are packed between the stepped bars 3 _{1 to} 3 _{n of the} portal ladder members 11 ₁ to 1 _n adjacent to each other when the ladder is contracted. In order to prevent this, the gate-type ladder members 11 ₁ to 1 _n are provided with the interval holding means 6 for maintaining the interval S between the step bars 3 _{1 to} 3 _n necessary for preventing the finger padding.

各間隔保持手段６は、図３に示すように、各門形梯子部材１₁〜１_nの各側枠部材４₁〜４_n上端部に嵌合固定される踏み桟取付用短管部材４₁〜４_nの上端部を指詰め防止に必要な踏み桟間の間隔Ｓが確保されるように上方へ所要長さδだけ延長することによって形成された延長管部７からなるものである。この場合、指詰め防止に必要な踏み桟３₁〜３_n相互間の間隔Ｓは１５ｍｍ程度とされる。従って、各衝撃緩和用リング５₁〜５_nのリング幅ｗ（軸方向長さ）を４ｍｍとし、各踏み桟取付用短管部材４₁〜４_n（延長管部７を除く）の上端と各踏み桟３₁〜３_nの上端との距離ηを２ｍｍとすれば、延長管部６の軸方向長さηは、１５ｍｍ−４ｍｍ−２ｍｍ＝９ｍｍとされる。 As shown in FIG. 3, each interval holding means 6 is a short pipe member 4 for attaching a tread bar that is fitted and fixed to the upper ends of the side frame members 4 ₁ to 4 _{n of the} portal ladder members ₁₁ to 1 _n. _It consists of an extension pipe portion 7 formed by extending the upper ends of ₁ to 4 _n upward by a required length δ so as to ensure the spacing S between the treads necessary for preventing finger filling. In this case, the distance S between the step bars 3 _{1 to} 3 _n necessary for preventing finger filling is about 15 mm. Accordingly, the ring width w (axial length) of each of the impact mitigating rings 5 _{1 to} 5 _n is set to 4 mm, and the upper ends of the short bar members 4 ₁ to 4 _n (excluding the extension pipe portion 7) for attaching the tread bars If the distance η with respect to the upper ends of the step bars 3 _{1 to} 3 _n is 2 mm, the axial length η of the extension pipe portion 6 is 15 mm−4 mm−2 mm = 9 mm.

各門形梯子部材１₁ 〜１_n には各踏み桟３₁ 〜３_n の両端部に、従来の伸縮梯子Ｂと同じ様に、梯子伸張時に上段側梯子部材の踏み桟と下段側の踏み桟とを一定間隔に保持するためのストッパー手段９が設けられている。このストッパー手段９については、図７で説明した従来の伸縮梯子Ｂと同じ構造であるため、図３には図７に示す従来の梯子Ｂと同じ符号を付して、その説明を省略する。 Each gate-shaped ladder member 1 ₁ to 1 _n has a stepped rail and a lower step on the upper ladder member at both ends of each of the walking bars 3 _{1 to} 3 _{n in} the same manner as the conventional telescopic ladder B. Stopper means 9 is provided for holding the crosspieces at regular intervals. Since the stopper means 9 has the same structure as the conventional telescopic ladder B described in FIG. 7, the same reference numerals as those of the conventional ladder B shown in FIG.

上記のような構成よりなる本発明に係る伸縮梯子Ａによれば、梯子収縮時に上下に隣り合う門形梯子部材１₁〜１_nの踏み桟３₁〜３_n間で作業者の指を詰めるのを防止するためその指詰め防止に必要な踏み桟３₁〜３_n相互間の間隔Ｓを例えば１５ｍｍに保持する間隔保持手段６を各門形梯子部材１₁〜１_nに設けていることから、この梯子Ａを伸張状態（図６の(a) 参照）から収縮状態（図６の(b) 参照）に折り畳み収縮作業を行う際に、上下に隣り合う踏み桟３₁〜３_n相互間で作業者の手指を挟むことがなくなり、その折り畳み収縮作業を安全に行うことができる。 According to the telescopic ladder A according to the present invention having the above-described configuration, the operator's fingers are packed between the stepping bars 3 _{1 to} 3 _{n of the} portal ladder members ₁₁ to 1 _n adjacent to each other when the ladder contracts. In order to prevent this, the gate-type ladder members 1 ₁ to 1 _n are provided with interval holding means 6 for maintaining the distance S between the step bars 3 _{1 to} 3 _n necessary for preventing finger filling, for example, 15 mm. When the ladder A is folded from the extended state (see FIG. 6 (a)) to the contracted state (see FIG. 6 (b)), the ladders 3 _{1 to} 3 _n adjacent to each other in the vertical direction are mutually connected. The operator's fingers are not sandwiched between them, and the folding and contracting work can be performed safely.

図４の(a) は本発明に係る改良型伸縮梯子Ａの収縮状態を示す正面図、(b) は従来型伸縮梯子Ｂの収縮状態を示す正面図で、(a) ，(b) を比較すれば分かるように、改良型伸縮梯子Ａは収縮状態において従来型伸縮梯子Ｂより丈が若干高くなるが、上下に隣り合う門形梯子部材１₁〜１_nの踏み桟３₁〜３_n間が間隔保持手段６によって指詰め防止に必要な間隔Ｓに保持されるから、作業者の手指を挟むことがない。 4 (a) is a front view showing the contracted state of the improved telescopic ladder A according to the present invention, (b) is a front view showing the contracted state of the conventional telescopic ladder B, and (a) and (b) are shown. As can be seen from comparison, the improved telescopic ladder A is slightly higher in height than the conventional telescopic ladder B in the contracted state, but the step bars 3 _{1 to} 3 _{n of the} portal ladder members ₁₁ to 1 _n adjacent to each other in the vertical direction. Since the gap is held at the gap S necessary for preventing finger filling by the gap holding means 6, the operator's fingers are not caught.

上記間隔保持手段６は、図２及び図３に示すように、各門形梯子部材１₁〜１_nの各側枠部材２₁〜２_n上端部に嵌合固定される踏み桟取付用短管部材４₁〜４_nの上端部又は下端部を指詰め防止に必要な踏み桟３₁〜３_n間の間隔Ｓが確保されるように上方又は下方へ所要長さだけ延長することによって形成された延長管部７からなるものであって、梯子収縮時には、図３に示すように、上下に隣り合う門形梯子部材１₁〜１_nの上段側梯子部材の踏み桟取付用短管部材４₁〜４_nの下端に取り付けてある衝撃緩和用リング５₁〜５_nが下段側梯子部材の踏み桟取付用短管部材４₁〜４_nの上端部にある延長管部７に当接した状態となり、しかして上下に隣り合う踏み桟３₁〜３_n相互間の間隔Ｓは、１５ｍｍ程度と広いから、指詰めを有効に防止することができる。 As shown in FIGS. 2 and 3, the gap holding means 6 is a short tread bar mounting short that is fitted and fixed to the upper end portions of the side frame members 2 ₁ to 2 _{n of the} portal ladder members 1 ₁ to 1 _n. Formed by extending the upper end or lower end of the pipe members 4 ₁ to 4 _n upward or downward by a required length so as to ensure the space S between the step bars 3 _{1 to} 3 _n necessary for preventing finger filling. 3. When the ladder is contracted, as shown in FIG. 3, a short pipe member for attaching a stepping bar to upper ladder members 11 ₁ to 1 _n adjacent to each other in the vertical direction when the ladder is contracted. The impact mitigating rings 5 _{1 to} 5 _n attached to the lower ends of 4 ₁ to 4 _n come into contact with the extension pipe portion 7 at the upper end of the short beam member 4 ₁ to 4 _n of the lower ladder member. and state will have, Thus the spacing S between the stepping vertically adjacent crosspiece 3 ₁ to 3 _n mutually from 15mm about a wide, enable pinched fingers proof It can be.

このように間隔保持手段６が踏み桟取付用短管部材４₁〜４_nの上端部を上方へ所要長さだけ延長することによって形成された延長管部７からなる場合は、踏み桟取付用短管部材４₁〜４_nの製作時には各踏み桟取付用短管部材４₁〜４_nの上端部を所要長さ上方へ延設すればよいから、製作が容易となる。尚、この延長管部７は、各踏み桟取付用短管部材４₁〜４_nの下端部を下方へ所要長さだけ延長することによって形成してもよい。 Thus, when the space | interval holding | maintenance means 6 consists of the extension pipe part 7 formed by extending only the required length for the upper end part of the short pipe members 4 ₁ to 4 _n for the tread bar attachment, When the short pipe members 4 ₁ to 4 _n are manufactured, the upper ends of the short pipe members 4 ₁ to 4 _n for attaching the tread bars only need to be extended upward by a required length, so that the manufacture becomes easy. Incidentally, the extension pipe unit 7 may be formed by extending by a required length of the lower end of the short pipe member 4 ₁ to 4 _n for with each stepping桟取downward.

また図１〜図３に示す実施形態では、各間隔保持手段６を、各門形梯子部材１₁〜１_nの各側枠部材２₁〜２_n上端部に嵌合固定される踏み桟取付用短管部材４₁〜４_nの上端部（又は下端部）を指詰め防止に必要な踏み桟間の間隔Ｓが確保されるように上方（又は下方）へ所要長さだけ延長して形成した延長管部７からなるものとしたが、他の間隔保持手段６としては、図５に示すように、各門形梯子部材１₁〜１の各側枠部材２₁〜２_n上端部に嵌合固定される踏み桟取付用短管部材４₁〜４_nの下端に一端が接するように各側枠部材２₁〜２_nに嵌合される衝撃緩和用リング１５₁〜１５_nであって、指詰め防止に必要な踏み桟間の間隔Ｓが確保されるようにリング幅が拡張された（拡張されたリング幅をＷで示す）衝撃緩和用リング１５₁〜１５_nからなるものでもよい。この撃緩和用リング１５₁〜１５_nは、踏み桟取付用短管部材４₁〜４_nの上端に一端が接するように各側枠部材２₁〜２_nに嵌合されるものでもよい。 In the embodiment shown in FIGS. 1 to 3, each interval holding means 6, with stepping桟取fitted and secured to each side frame member 2 ₁ to 2 _n upper ends of the portal ladder member 1 ₁ to 1 _n The upper end portions (or lower end portions) of the short tube members 4 ₁ to 4 _n are formed to extend upward (or downward) by a required length so as to ensure the space S between the tread bars necessary for preventing finger filling. However, as shown in FIG. 5, the other gap holding means 6 is provided at the upper end of each side frame member 2 ₁ to 2 _{n of} each of the portal ladder members 1 ₁ to _1. met each side frame member 2 ₁ a fitted are cushioning in to 2 _n ring 15 ₁ to 15 _n as one end is in contact with the lower end of the fitting fixed is depressed桟取short pipe member 4 ₁ to 4 _n for w Te, (shows an expanded ring width W) of the ring width to the spacing S between桟間stepping necessary pinched fingers prevention is secured is expanded cushioning ring 15 ₁ It may consist of ˜15 _n . The撃緩sum ring 15 ₁ to 15 _n may be one fitted to each side frame member 2 ₁ to 2 _n as one end is in contact with the upper end of the short pipe member 4 ₁ to 4 _n for w桟取stepping.

図５に示す梯子Ａの場合、指詰め防止に必要な踏み桟３₁〜３_n相互間の間隔Ｓを１５ｍｍとして、各踏み桟取付用短管部材４₁〜４_nの上端と各踏み桟３₁〜３_nの上端との距離ηを２ｍｍとすれば、各衝撃緩和用リング１５₁〜１５_nの拡張リング幅Ｗは、１５ｍｍ−２ｍｍ＝１３ｍｍとされる。 In the case of the ladder A shown in FIG. 5, the distance S between the step bars 3 _{1 to} 3 _n necessary for preventing finger jamming is set to 15 mm, and the upper ends of the short pipe members 4 ₁ to 4 _n for each step bar and the respective step bars If the distance η with respect to the upper ends of 3 _{1 to} 3 _n is 2 mm, the expanded ring width W of each of the impact relaxation rings 15 ₁ to 15 _n is 15 mm−2 mm = 13 mm.

このように間隔保持手段６が、各門形梯子部材１₁〜１_nの各側枠部材２₁〜２_n上端部に嵌合固定される踏み桟取付用短管部材４₁〜４_nの下端又は上端に一端が接するように各側枠部材２₁〜２_nに嵌合される衝撃緩和用リング１５₁〜１５_nであって、指詰め防止に必要な踏み桟３₁〜３_n間の間隔Ｓが確保されるようにリング幅の拡張された衝撃緩和用リング１５₁〜１５_nからなるものによれば、従来使用されている伸縮梯子にリング幅の拡張された衝撃緩和用リング１５₁〜１５_nを取り付ければよいから、従来の伸縮梯子をそのまま利用することもできる。 Interval holding means 6 in this manner, each portal ladder member 1 ₁ to 1 _n each side frame member 2 ₁ to 2 _n upper end portion to the fitting fixed to the tread short pipe member 4 ₁ to 4 _n for w桟取of a lower or upper end cushioning ring 15 ₁ to 15 _n which are fitted to each side frame member 2 ₁ to 2 _n as an end in contact, stepping necessary pinched fingers prevent crosspiece 3 ₁ between to 3 _n According to the structure comprising the impact relaxation rings 15 ₁ to 15 _n whose ring width is expanded so as to ensure the space S, the impact relaxation ring 15 whose ring width is expanded to the conventionally used telescopic ladder. since it may be attached to ₁ to 15 _n, can be used a conventional telescopic ladder as it is.

本発明に係る伸縮梯子Ａを収縮状態で示す正面図である。It is a front view which shows the expansion-contraction ladder A which concerns on this invention in a contracted state. (a) は図１のＸ−Ｘ線断面図、(b) は(a) の矢印Ｙで示す部分の拡大図である。(a) is the XX sectional drawing of FIG. 1, (b) is an enlarged view of the part shown by the arrow Y of (a). 縮状態における伸縮梯子Ａの例えば下から２番目〜４番目の門形梯子で、材１₂〜１₄の一部拡大断面図である。FIG. _{4 is} a partially enlarged cross-sectional view of members 1 ₂ to 14, for example, the second to fourth portal ladders from the bottom of the telescopic ladder A in the contracted state. (a) は本発明に係る改良型伸縮梯子Ａの収縮状態を示す正面図、(b) は従来型伸縮梯子Ｂの収縮状態を示す正面図である。(a) is a front view which shows the contraction state of the improved expansion-contraction ladder A which concerns on this invention, (b) is a front view which shows the contraction state of the conventional expansion-contraction ladder B. FIG. 間隔保持手段６の他の実施形態を示す図３と同様な断面図である。It is sectional drawing similar to FIG. 3 which shows other embodiment of the space | interval holding means. (a) は従来のアルミ製伸縮梯子Ｂを伸張状態で示す斜視図、(b) は同伸縮梯子Ｂを収縮状態で示す斜視図である。(a) is the perspective view which shows the conventional aluminum expansion-contraction ladder B in the expansion | extension state, (b) is the perspective view which shows the expansion-contraction ladder B in the contraction state. 収縮状態における伸縮梯子Ｂの例えば下から２番目〜４番目の門形梯子部材１₂〜１₄の一部拡大断面図である。Is a partially enlarged cross-sectional view from below eg telescopic ladder B in a contracted state the second to 4 th portal ladder member 1 _2-1 _4.

符号の説明Explanation of symbols

Ａ本発明の改良型伸縮梯子
Ｂ従来型伸縮梯子
１₁〜１_n 門形梯子部材
２₁〜２_n 側枠部材
３₁〜３_n 踏み桟
４₁〜４_n 踏み桟取付用短管部材指詰め
５₁〜５_n 衝撃緩和用リング
６間隔保持手段
７踏み桟取付用短管部材の延長管部
９ストッパー手段
１５₁〜１５_n 衝撃緩和用リング
A Improved telescopic ladder of the present invention B Conventional telescopic ladder 1 ₁ to 1 _n Gate-shaped ladder member 2 ₁ to 2 _n Side frame member 3 _{1 to} 3 _n Step bar 4 ₁ to 4 _n Short pipe member finger for mounting the step bar Packing 5 _{1 to} 5 _n Impact mitigating ring 6 Interval holding means 7 Extension pipe portion 9 of short pipe member for stepping bar attachment Stopper means 15 ₁ to 15 _n Impact mitigating ring

Claims

両側一対の筒状側枠部材と両側枠部材の上端部間に横架される踏み桟とで門形に形成されて上下複数段に配置される門形梯子部材の側枠部材どうしを入れ子式に嵌合してなる伸縮梯子において、
梯子収縮時に上下に隣り合う門形梯子部材の踏み桟間で作業者の指を詰めるのを防止するためにその指詰め防止に必要な踏み桟間の間隔を保持する間隔保持手段を設け、
該間隔保持手段は、各門形梯子部材の各側枠部材上端部に嵌合固定される踏み桟取付用短管部材の上端部又は下端部を指詰め防止に必要な踏み桟間の間隔が確保されるように上方又は下方へ所要長さだけ延長することによって形成された延長管部からなることを特徴とする伸縮梯子。 Nested side frame members of a portal ladder member that is formed in a gate shape with a pair of cylindrical side frame members on both sides and a step bar that is placed between the upper ends of both side frame members and arranged in multiple stages above and below. In the telescopic ladder that is fitted to
In order to prevent clogging of the operator's fingers between the stepped bars of the gate ladder members adjacent to each other when the ladder is contracted, there is provided an interval holding means for holding the interval between the stepped bars necessary for preventing the fingering ,
The interval holding means is configured such that the interval between the step bars required to prevent finger jamming at the upper end portion or the lower end portion of the short tube member for mounting the step beam attached to the upper end portion of each side frame member of each portal ladder member is fixed. A telescopic ladder comprising an extension pipe portion formed by extending a predetermined length upward or downward so as to be secured .

両側一対の筒状側枠部材と両側枠部材の上端部間に横架される踏み桟とで門形に形成されて上下複数段に配置される門形梯子部材の側枠部材どうしを入れ子式に嵌合してなる伸縮梯子において、
梯子収縮時に上下に隣り合う門形梯子部材の踏み桟間で作業者の指を詰めるのを防止するためにその指詰め防止に必要な踏み桟間の間隔を保持する間隔保持手段を設け、
該間隔保持手段は、各門形梯子部材の各側枠部材上端部に嵌合固定される踏み桟取付用短管部材の下端又は上端に一端が接するように各側枠部材に嵌合される衝撃緩和用リングであって、指詰め防止に必要な踏み桟間の間隔が確保されるようにリング幅が拡張された衝撃緩和用リングからなることを特徴とする伸縮梯子。 Nested side frame members of a portal ladder member that is formed in a gate shape with a pair of cylindrical side frame members on both sides and a step bar that is placed between the upper ends of both side frame members and arranged in multiple stages above and below. In the telescopic ladder that is fitted to
In order to prevent clogging of the operator's fingers between the stepped bars of the gate ladder members adjacent to each other when the ladder is contracted, there is provided an interval holding means for holding the interval between the stepped bars necessary for preventing the fingering,
The interval holding means is fitted to each side frame member so that one end is in contact with the lower end or the upper end of the short pipe member for attaching the tread bar which is fitted and fixed to the upper end portion of each side frame member of each portal ladder member. A telescopic ladder comprising an impact buffering ring, the ring width of which is expanded so as to ensure a space between treads necessary for preventing finger jamming .