JPH04363498A - Storable ladder - Google Patents
Storable ladderInfo
- Publication number
- JPH04363498A JPH04363498A JP34073390A JP34073390A JPH04363498A JP H04363498 A JPH04363498 A JP H04363498A JP 34073390 A JP34073390 A JP 34073390A JP 34073390 A JP34073390 A JP 34073390A JP H04363498 A JPH04363498 A JP H04363498A
- Authority
- JP
- Japan
- Prior art keywords
- pipes
- ladder
- vertical frame
- crosswise
- pillars
- 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
Links
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 5
- 229910052719 titanium Inorganic materials 0.000 claims description 5
- 239000010936 titanium Substances 0.000 claims description 5
- 230000000694 effects Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003562 lightweight material Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Landscapes
- Ladders (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、軽量で収納・開設が容易であり、とくに消
防活動などの緊急時に有用な搬送性および作業性に優れ
る収納式梯子に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a retractable ladder that is lightweight, easy to store and open, and has excellent transportability and workability, which is particularly useful in emergencies such as firefighting operations.
従来、火事などの災害現場で人命救助や消防活動に使
用されている梯子は、主に鋼材により構成された二つ折
もしくは多段伸縮式の折り畳み構造のものが主流を占め
ている。Conventionally, ladders used for lifesaving and firefighting activities at disaster sites such as fires have mainly been made of steel and have a bifold or multi-stage telescoping structure.
ところが、二つ折構造の梯子は災害現場で展長する際に
広い場所を必要とするため、狭いスペースでの使用に困
難性を伴う作業上の欠点がある。However, the bi-fold structure ladder requires a large space when extended at a disaster site, and has the disadvantage of being difficult to use in a narrow space.
一方、多段伸縮式の梯子は構造が複雑化するうえに、支
柱強度を増すために重なり部分を多く採らなければなら
ない関係で十分な長さを確保するには著しく重量増にな
る問題点がある。On the other hand, multi-level telescoping ladders have a complicated structure, and have the problem of significantly increasing weight in order to ensure sufficient length, as they must have a large number of overlapping sections to increase the strength of the support. .
このため、高層の集合住宅などの消火活動を対象とする
大鉤付梯子などは、軽量のアルミ合金材で形成されたも
のが採用されている。しかし、この場合でも力の掛かる
大鉤部分は鋼製となっているため全体の重量バランスが
悪く、搬送性の点に問題がある。For this reason, ladders with large hooks and the like used for extinguishing fires in high-rise apartment complexes and the like are made of lightweight aluminum alloy materials. However, even in this case, since the large hook portion on which the force is applied is made of steel, the overall weight balance is poor and transportability is problematic.
更に、通常、梯子の大鉤部分は内側に閉じて収納する機
構となっているが、使用時の開脚固定化はピン挿入式の
ロック構造となっているため往々にしてロックがうまく
作動せず、無理に力を入れると破損する事態が発生する
。このようにロックが破損すると、大鉤が不必要に外側
に開き、危険な状態を惹起する。Furthermore, the large hook part of a ladder is usually closed inward for storage, but the locking mechanism is a pin insertion type that locks the legs apart during use, so the lock often does not work properly. If you apply too much force, damage may occur. If the lock is damaged in this manner, the hook may unnecessarily open outward, creating a dangerous situation.
上記の実情から、災害現場などで緊急時に使用される梯
子には、軽量で搬送性がよく、作業性に優れる構造のも
のが強く要求されている。Due to the above-mentioned circumstances, there is a strong demand for ladders used in emergencies such as disaster sites to have a structure that is lightweight, easy to transport, and has excellent workability.
本発明は前記の要求に沿うために開発されたもので、そ
の目的は、全体が軽量材によりバランスのよく構成され
、開設組立が容易でコンパクトに収納することができる
搬送性、作業性および安全性に優れた収納式梯子を提供
するにある。The present invention was developed to meet the above-mentioned requirements.The purpose of the present invention is to have a well-balanced construction made entirely of lightweight materials, easy to open and assemble, compact storage, transportability, workability, and safety. To provide a retractable ladder with excellent functionality.
上記の目的を達成するための本発明による収納式梯子は
、コ字形断面を有する縦枠支柱の内面に横桟パイプを上
下方向に遊動自在に軸着して前記横桟パイプを斜動させ
た際に対向面が当接する縦枠支柱の内部に横桟パイプが
収納される構造を備え、前記縦枠支柱の側部に梯子を開
設したときに側面孔を介してロックピンの先端部が横桟
パイプ内に挿入する機構のバネ式ロック手段を少なくと
も１箇所設置し、両方の縦枠支柱の上部位置に９００回
転した際にバネ機構により引掛鉤部材と直結する回転嵌
子が固定凹部材に嵌着して向き変更ができるカム型鉤固
定手段を介設し、かつ部材全体がチタンもしくはチタン
合金により構成されてなることを構造上の特徴とする。In order to achieve the above object, the retractable ladder according to the present invention includes a horizontal pipe that is pivotally attached to the inner surface of a vertical frame support having a U-shaped cross section so as to be freely movable in the vertical direction, and the horizontal pipe is tilted. When a ladder is opened on the side of the vertical frame support, the tip of the lock pin is inserted horizontally through the side hole. At least one spring-type lock means of a mechanism inserted into the crosspiece pipe is installed, and when rotated 900 times at the upper position of both vertical frame supports, the rotating fitter directly connected to the hook member is connected to the fixed concave member by the spring mechanism. The structural feature is that a cam-type hook fixing means that can be fitted to change the direction is provided, and the entire member is made of titanium or titanium alloy.
本発明の収納式梯子は上記のように構成されているから
、開設形態にある梯子から横桟パイプを斜動させること
により縦枠支柱が平行移動的に近接して相互の対向面が
当接し、各横桟パイプは縦枠支柱の内部に折り畳まれた
状態に収納される。Since the retractable ladder of the present invention is configured as described above, by obliquely moving the horizontal pipe from the ladder in the open configuration, the vertical frame supports approach in a parallel movement and their mutually opposing surfaces abut. , each horizontal pipe is stored in a folded state inside the vertical frame support.
したがって、横桟が収納されたときには両縦枠支柱が重
なったコンパクトな棒状に転化し、搬送性を高めるとと
もに、車両積載や保管が従来よりも小面積のスペースで
処理することができる。Therefore, when the horizontal beam is stored, it transforms into a compact rod shape with both vertical frame supports overlapping, which improves transportability and allows for vehicle loading and storage in a smaller space than before.
梯子を開設する場合には、前記とは逆に縦枠支柱を開脚
して横桟パイプが縦枠支柱と直角になる状態とし、バネ
式ロック手段を作動してロックピンの先端部を横桟パイ
プ内に挿入する。この開設操作は、その都度梯子を地上
に置く必要なしに狭い場所で容易かつ迅速におこなうこ
とができ、安全な梯子の開設形態を形成する。When opening the ladder, open the vertical frame supports in the opposite way to the above so that the horizontal pipes are at right angles to the vertical frame supports, and activate the spring-type locking means to lock the tip of the lock pin horizontally. Insert into the crosspiece pipe. This opening operation can be easily and quickly performed in a narrow space without the need to place the ladder on the ground each time, and forms a safe ladder opening configuration.
また、引掛鉤部材は９０゜回転した際にバネ機構により
引掛鉤部材に直結している回動嵌子が固定凹部材に嵌着
して向き変更しえるカム型の固定手段となっているから
、引掛鉤部材の先端部分を押し回しすることによりワン
タッチで使用状態と収納状態の切り換えが可能となる。In addition, when the hook member is rotated 90 degrees, the rotational fitter, which is directly connected to the hook member by a spring mechanism, fits into the fixed concave member and becomes a cam-type fixing means that can change the direction. By pushing and turning the tip of the hook member, it is possible to switch between the usage state and the storage state with a single touch.
更に、部材全体が軽量でアルミ合金に比べ材質強度、耐
熱性、耐食性に優れるチタンまたはチタン合金により構
成されているため、火炎に晒される火災現場での使用に
より熱変形することがなく、また常に良好な重量バラン
ス性と安全性が付与される。そのうえ、各部材をアルミ
合金より肉薄に形成することができるから、一層の軽量
化を図ることができる。Furthermore, since the entire component is made of titanium or titanium alloy, which is lightweight and has superior material strength, heat resistance, and corrosion resistance compared to aluminum alloy, it will not undergo thermal deformation when used at a fire site exposed to flames, and Provides good weight balance and safety. Moreover, since each member can be formed thinner than aluminum alloy, further weight reduction can be achieved.
このような機構的、材質的作用を介して優れた搬送性、
作業性ならびに安全性がもたらされる。Excellent transportability is achieved through such mechanical and material effects.
Improves workability and safety.
なお、不発明の収納式梯子は特に消防活動に有用である
が、これに限られるものではなく、例えば避難用、一般
家庭用としても使用しえることは言うまでもない。Although the retractable ladder according to the invention is particularly useful for firefighting, it is not limited to this, and it goes without saying that it can also be used for evacuation purposes and for general household purposes.
以下、本発明を図示の実施例に基づいて説明する。 Hereinafter, the present invention will be explained based on illustrated embodiments.
第１図は本発明の収納式梯子の主要部を示したもので、
（ａ）は側面図、（ｂ）は正面図である。Figure 1 shows the main parts of the retractable ladder of the present invention.
(a) is a side view, and (b) is a front view.
これら図において、１は縦枠支柱、２は足掛け昇降用の
横桟パイプ、３はバネ式ロック手段、４は引掛鉤部材そ
して５はカム型固定手段である。これら部材の材質は、
全てチタンもしくはチタン合金で構成されている。In these figures, 1 is a vertical frame support, 2 is a horizontal pipe for raising and lowering the footrest, 3 is a spring type locking means, 4 is a hook member, and 5 is a cam type fixing means. The materials of these parts are
All made of titanium or titanium alloys.
縦枠支柱１と横桟パイプ２の結合は、第２図〔第１図（
ｂ）のＡ−Ａ′線図〕に示すようにコ字形断面を有する
両縦枠支柱の内面に横桟パイプ２を位置調整管６および
ボルト７を介して上下方向に遊動自在に軸着した構造と
なっている。したがって、横桟パイプ２を斜動させると
縦枠支柱１相互が逆方向に平行移動して第３図（ａ）の
形態となり、更に横桟パイプ２を折り畳むと第３図（ｂ
）のように縦枠支柱１の対向面８、８′が当接し、横桟
パイプ２が縦枠支柱１の内面溝内に収納された棒状の形
態に転化する。The connection between the vertical frame support 1 and the horizontal frame pipe 2 is shown in Figure 2 [Figure 1 (
As shown in the A-A' diagram of b), a horizontal pipe 2 is pivotally attached to the inner surface of both vertical frame supports having a U-shaped cross section via a position adjustment pipe 6 and a bolt 7 so as to be freely movable in the vertical direction. It has a structure. Therefore, when the horizontal pipe 2 is tilted, the vertical frame supports 1 mutually move in parallel in opposite directions, resulting in the configuration shown in FIG.
), the opposing surfaces 8 and 8' of the vertical frame support 1 come into contact with each other, and the horizontal pipe 2 is transformed into a rod-like form housed in the inner groove of the vertical frame support 1.
梯子を開設しようとする場合には、前記とは逆に縦枠支
柱１を開脚して第３図（ｂ）、（ａ）の順序を経て横桟
パイプ２が縦枠支柱１と直角となる第１図の形態にし、
バネ式ロック手段３を作動して固定する。When attempting to open a ladder, the vertical frame support 1 is opened in the opposite direction to the above, and the horizontal frame pipe 2 is made perpendicular to the vertical frame support 1 through the sequence shown in Fig. 3(b) and (a). In the form shown in Figure 1,
The spring type locking means 3 is actuated and fixed.
バネ式ロック手段３は、第４図に例示したごとく縦枠支
柱１に穿設された側面孔９を介してロックピン１０の先
端部が横桟パイプ２内に挿入する機構に設計され、少な
くとも縦枠支柱１の側部にの１箇所設置する。すなわち
、第４図のバネ式ロック手段３は、端部に９０゜の角度
で浅溝１１および深溝１２を有する筒管１３内にコイル
状スプリング１４を介して把手１５を備えるロックピン
１０を装着した構造で、開放時には第４図（ａ）のよう
に把手１５を浅溝１１に嵌合してロックピン１０の先端
部を横桟パイプ２から離した状態にセットし、固定時に
は第４図（ｂ）のように把手１５を引きながら９０゜回
転させて深溝１２内に嵌合するとコイル状スプリング１
４の作用でロックピン１０の先端部が先に伸びて横桟パ
イプ２内に挿入し、横桟パイプ２を確実に固定する。こ
の際、ロックピン１０の先端を挿入時に横桟パイプ２内
の軸支ボルト７に拘持するような湾曲凹状に形成してお
くと一層固定化が確実となる。The spring-type locking means 3 is designed to have a mechanism in which the tip of the locking pin 10 is inserted into the horizontal pipe 2 through a side hole 9 bored in the vertical frame support 1, as illustrated in FIG. Install it in one place on the side of the vertical frame support 1. That is, the spring-type locking means 3 shown in FIG. 4 has a locking pin 10 equipped with a handle 15 mounted through a coiled spring 14 in a cylindrical tube 13 having a shallow groove 11 and a deep groove 12 at an angle of 90 degrees at the end thereof. When opened, the handle 15 is fitted into the shallow groove 11 as shown in Fig. 4(a), and the tip of the lock pin 10 is set away from the horizontal pipe 2, and when fixed, as shown in Fig. 4. When the handle 15 is pulled and rotated 90 degrees to fit into the deep groove 12 as shown in (b), the coiled spring 1
4, the tip of the lock pin 10 is extended first and inserted into the horizontal pipe 2, and the horizontal pipe 2 is securely fixed. At this time, if the tip of the lock pin 10 is formed into a curved concave shape so as to be held against the pivot bolt 7 in the horizontal beam pipe 2 during insertion, fixation will be further ensured.
カム型固定手段５は、引掛鉤４を機能させるために両縦
枠支柱１の上部位置に介設された部材で、第５図に示す
ように９０゜回転した際にバネ機構により引掛鉤部材４
と直結する回動嵌子１６が固定凹部材１７に嵌着して向
き変更ができる構造に設計されている。具体的な構造機
構は、内部が筒状で端部に等間隔に４箇所の切欠き溝１
８を備える固定凹部材１７と、引掛鉤部材４に連結し中
間部がコイル状スプリング１４を介して前記筒状内部を
貫通し、基端部に回動嵌子１６を固着した部材とから構
成されている。そして、収納時には、第５図（ａ）のよ
うに引掛鉤部材４を倒した状態に回動嵌子１６を固定凹
部材１７の切欠き溝１８に嵌着する。使用時には第５図
（ｂ）に示すように引掛鉤部材４を押しながら回転して
嵌着状態を解除し、引続き第５図（ｃ）のように９０゜
回転させて回動嵌子１６を固定凹部材１７の別の切欠き
溝１８に嵌め込んで確実に固定する。この場合、固定凹
部材１７の切欠き溝１８に図示のごとくテーパーを形成
しておくと、引掛鉤部材４の回転操作のみで自動的に回
動嵌子１６が回動するから作業をワンタッチでおこなう
ことが可能となる。The cam type fixing means 5 is a member installed at the upper part of both vertical frame supports 1 in order to make the hook 4 function, and when the hook is rotated by 90 degrees as shown in FIG. 5, the hook member is fixed by a spring mechanism. 4
The rotary fitting 16, which is directly connected to the fixed recessed member 17, is designed to have a structure in which the direction can be changed by fitting into the fixed recessed member 17. The specific structural mechanism is that the inside is cylindrical and there are four notched grooves 1 at equal intervals on the end.
8, and a member connected to the hook member 4, whose intermediate portion penetrates the cylindrical interior via a coiled spring 14, and has a rotating fitting 16 fixed to its base end. has been done. When storing, the rotary fitting 16 is fitted into the cutout groove 18 of the fixed concave member 17 with the hook member 4 in the folded state as shown in FIG. 5(a). When in use, press and rotate the hook member 4 as shown in FIG. 5(b) to release the fitted state, and then rotate it 90 degrees as shown in FIG. 5(c) to release the rotating member 16. It is fitted into another notch groove 18 of the fixing recessed member 17 to securely fix it. In this case, if the notch groove 18 of the fixed concave member 17 is tapered as shown in the figure, the rotary fitting 16 will automatically rotate simply by rotating the hook member 4, so that the work can be done with one touch. It becomes possible to do so.
以上のとおり、本発明による構造の収納梯子は全体が軽
量で優れた材質強度と耐熱安定性を有するチタンもしく
はチタン合金によってバランスよく構成されており、収
納時の形態が極めてコンパクトで、収納・開設が狭い場
所でも容易にでき、開設時に横桟パイプを固定するため
のバネ式ロック手段および引掛鉤部材を向き変更させる
ためのカム型固定手段は迅速な操作性で、常に安全確実
な固定状態を形成することができる。As described above, the storage ladder with the structure according to the present invention is made of titanium or titanium alloy, which is lightweight and has excellent material strength and heat resistance stability, in a well-balanced manner, and is extremely compact when stored. The spring-type locking means for fixing the horizontal pipe when opening and the cam-type fixing means for changing the direction of the hook member are quick and easy to operate, ensuring a safe and secure fixed state at all times. can be formed.
したがって、従来構造の梯子に比べて搬送性、作業性、
安全性などの面で改善効果が大きいから、特に消防活動
など緊急時に使用する棒状梯子として極めて有用である
。Therefore, compared to conventionally structured ladders, it has improved transportability and workability.
Since it has a significant improvement effect in terms of safety, it is extremely useful as a bar-shaped ladder, especially for use in emergencies such as firefighting operations.
第１図は本発明による収納式梯子の主要部を示したもの
で（ａ）は側面図、（ｂ）は平面図である。第２図は第
１図（ｂ）のＡ−Ａ′線に沿う一部切欠断面図である。
第３図（ａ）、（ｂ）は梯子の収納状態を示す説明図で
ある。第４図はバネ式ロック手段を例示した一部切欠断
面図で、（ａ）は開放時の状態、（ｂ）は固定時の状態
を示したものである、第５図は引掛鉤部材のカム型固定
手段を例示した一部切欠断面図で、（ａ）は収納時（ｂ
）は向き変動時、（ｃ）は使用状態時を示したものであ
る。
１…縦枠支柱 ２…横桟パイプ
３…バネ式ロック手段 ４…引掛鉤部材５…カム型固定
手段 ６…位置調整管
７…ボルト ８、８′…対向面
９…側面孔 １０…ロックピン
１１…浅溝 １２…深溝
１３…筒管 １４…コイル状スプリング１５…把手 １
６…回動嵌子
１７…固定凹部材 １８…切欠き溝FIG. 1 shows the main parts of a retractable ladder according to the present invention, with (a) being a side view and (b) being a plan view. FIG. 2 is a partially cutaway sectional view taken along line AA' in FIG. 1(b). FIGS. 3(a) and 3(b) are explanatory diagrams showing the stored state of the ladder. Fig. 4 is a partially cutaway sectional view illustrating the spring-type locking means, in which (a) shows the open state and (b) shows the fixed state. Fig. 5 shows the hook member. A partially cutaway sectional view illustrating a cam-type fixing means, (a) is when stored (b)
) shows the state when the direction changes, and (c) shows the state of use. 1...Vertical frame support 2...Horizontal pipe 3...Spring type locking means 4...Hook member 5...Cam type fixing means 6...Position adjustment tube 7...Bolt 8, 8'...Opposing surface 9...Side hole 10...Lock pin 11... Shallow groove 12... Deep groove 13... Cylindrical pipe 14... Coiled spring 15... Handle 1
6... Rotating fitter 17... Fixed concave member 18... Notch groove
Claims (1)
パ イプを上下方向に遊動自在に軸着して前記横桟パイプを
斜動させた際に対向面が当接する縦枠支柱の内部に横桟
パイプが収納される構造を備え、前記縦枠支柱の側部に
梯子を開設したときに側面孔を介してロックピンの先端
部が横桟パイプ内に挿入する機構のバネ式ロック手段を
少なくとも１箇所設置し、両方の縦枠支柱の上部位置に
９０゜回転した際にバネ機構により引掛鉤部材と直結す
る回動嵌子が固定凹部材に嵌着して向き変更ができるカ
ム型固定手段を介設し、かつ部材全体がチタンもしくは
チタン合金により構成されてなることを特徴とする収納
式梯子。Claims: 1. A vertical frame support, in which a horizontal pipe is pivotally attached to the inner surface of a vertical frame support having a U-shaped cross section so as to be freely movable in the vertical direction; A spring-type lock that has a structure in which a horizontal pipe is housed inside, and has a mechanism in which the tip of the lock pin is inserted into the horizontal pipe through a side hole when a ladder is opened on the side of the vertical frame support. The cam is provided with means at at least one location, and when the cam is rotated by 90 degrees to the upper position of both vertical frame supports, the rotating fitting directly connected to the hook member is fitted into the fixed concave member by a spring mechanism, and the direction can be changed. 1. A retractable ladder characterized in that a mold fixing means is provided and the entire member is made of titanium or a titanium alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2340733A JP2976525B2 (en) | 1990-11-30 | 1990-11-30 | Retractable ladder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2340733A JP2976525B2 (en) | 1990-11-30 | 1990-11-30 | Retractable ladder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04363498A true JPH04363498A (en) | 1992-12-16 |
| JP2976525B2 JP2976525B2 (en) | 1999-11-10 |
Family
ID=18339793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2340733A Expired - Fee Related JP2976525B2 (en) | 1990-11-30 | 1990-11-30 | Retractable ladder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2976525B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100786724B1 (en) * | 2006-12-27 | 2007-12-21 | 전기태 | Foldable ladder for ship |
| CN105672867A (en) * | 2016-03-22 | 2016-06-15 | 中国五冶集团有限公司 | Foldable safety crawling ladder |
| CN105781401A (en) * | 2016-04-08 | 2016-07-20 | 成都科力夫科技有限公司 | Safety hook ladder |
| CN105888530A (en) * | 2016-04-08 | 2016-08-24 | 成都科力夫科技有限公司 | Safe and reliable anti-skid hanging ladder |
| CN107701085A (en) * | 2017-08-31 | 2018-02-16 | 合保电气（芜湖）有限公司 | The cat ladder of electric power operation |
| CN109854160A (en) * | 2019-03-19 | 2019-06-07 | 陕西理工大学 | A kind of winding self-locking safety insulating ladder |
-
1990
- 1990-11-30 JP JP2340733A patent/JP2976525B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100786724B1 (en) * | 2006-12-27 | 2007-12-21 | 전기태 | Foldable ladder for ship |
| CN105672867A (en) * | 2016-03-22 | 2016-06-15 | 中国五冶集团有限公司 | Foldable safety crawling ladder |
| CN105781401A (en) * | 2016-04-08 | 2016-07-20 | 成都科力夫科技有限公司 | Safety hook ladder |
| CN105888530A (en) * | 2016-04-08 | 2016-08-24 | 成都科力夫科技有限公司 | Safe and reliable anti-skid hanging ladder |
| CN107701085A (en) * | 2017-08-31 | 2018-02-16 | 合保电气（芜湖）有限公司 | The cat ladder of electric power operation |
| CN109854160A (en) * | 2019-03-19 | 2019-06-07 | 陕西理工大学 | A kind of winding self-locking safety insulating ladder |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2976525B2 (en) | 1999-11-10 |
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