CN104695848B - A kind of novel silo emergency staircase - Google Patents
A kind of novel silo emergency staircase Download PDFInfo
- Publication number
- CN104695848B CN104695848B CN201510073276.7A CN201510073276A CN104695848B CN 104695848 B CN104695848 B CN 104695848B CN 201510073276 A CN201510073276 A CN 201510073276A CN 104695848 B CN104695848 B CN 104695848B
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- CN
- China
- Prior art keywords
- ladder
- frame
- extension
- cat ladder
- hole
- 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.)
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- 241000282326 Felis catus Species 0.000 claims abstract description 62
- 230000002265 prevention Effects 0.000 claims abstract description 20
- 239000007787 solid Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 10
- 230000002708 enhancing effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C1/00—Ladders in general
- E06C1/02—Ladders in general with rigid longitudinal member or members
- E06C1/04—Ladders for resting against objects, e.g. walls poles, trees
- E06C1/08—Ladders for resting against objects, e.g. walls poles, trees multi-part
- E06C1/12—Ladders for resting against objects, e.g. walls poles, trees multi-part extensible, e.g. telescopic
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C7/00—Component parts, supporting parts, or accessories
- E06C7/18—Devices for preventing persons from falling
- E06C7/181—Additional gripping devices, e.g. handrails
- E06C7/182—Additional gripping devices, e.g. handrails situated at the top of the ladder
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C7/00—Component parts, supporting parts, or accessories
- E06C7/48—Ladder heads; Supports for heads of ladders for resting against objects
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D7/00—Shaft equipment, e.g. timbering within the shaft
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V33/00—Structural combinations of lighting devices with other articles, not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Engineering & Computer Science (AREA)
- Ladders (AREA)
Abstract
The present invention relates to a kind of novel silo emergency staircase, including cat ladder, it is arranged on the fixed frame of cat ladder bottom, is fixedly installed on the fall prevention frame on cat ladder top and the support bar being arranged on the inside of fixed frame, the fixed frame is in " convex " font of lower ending opening, the holding frame that the fixed frame includes the U-shaped frame on top and is connected with the U-shaped frame, two curb girders of the U-shaped frame and cat ladder are flexibly connected by axle, and the holding frame lateral dimension is more than well head diameter；Described support bar one end is flexibly connected with U-shaped frame by axle, and the movable end of the support bar sets the positioning hole for setting and being correspondingly arranged with through hole on through hole, the curb girder of the cat ladder, and the through hole is connected with positioning hole by pin；The two ends of the fall prevention frame are fixedly connected with two curb girders of cat ladder respectively.The present invention it is simple in construction, it is easy to use, it is possible to increase workmen in Construction of Silo on well safety and convenience.
Description
Technical field
The invention belongs to municipal construction apparatus field, and in particular to a kind of safety shaft ladder.
Background technology
With the development of urbanization, avenue underground pipe network just increases year by year, and many well lids are occurred in that on ground, are related to
And the underground communal facility such as electric power, communication, water supply, heating, coal gas, draining., be through normal open as the maintainer of communal facility
Vertical shaft is crossed to carry out the maintenance of equipment into tunnel and make an inspection tour work.At present, there are some vertical shafts there is no cat ladder, also there are some vertical shafts
Cat ladder is long neglected and in disrepair, causes damage not use, and applying vertical shaft above and below maintainer to ground brings great trouble.For above-mentioned
Situation, can be larger due to well depth if being transferred to using common staircase in well, causes staircase small at vertical direction angle of inclination, Gu
It is fixed insecure.For there is the vertical shaft of cat ladder, because cat ladder top is only set at well head in vertical shaft, do not have around the well head on ground
The fixing device helped can be climbed, Construction and Maintenance personnel pass in and out well, between shoulder bassets to pin and basseted, no to grip
Application point, add the difficulty gone into the well on workmen, be more easy to fall, reduce security.Meanwhile, according to power ampere
Full code, staff should use anti-fall device to carry out security protection, due to the depth of vertical shaft when depth of falling well is more than 2 meters
Differ, workmen, in order to increase security, it is necessary to dress arrest devices, but does not have during going into the well in existing vertical shaft
The fixing device of standby arrest devices, maintainer usually hangs height and determines to fix temporarily with or according to condition with carrying out to catching device
Point, takes time and effort and easily causes potential safety hazard.
Chinese patent " inspection well ladder "（The patent No.：ZL201020127569.1）Disclose a kind of be used for by being hung on catch pit port
Fixed ladder is realized, same fold laterally of a part that terraced leg extends upwards is processed into peg by the upper end of ladder, Ci Zhongti
Son when in use, fixes insecure, ladder is also easy to produce swing, reduces the security of construction, it is impossible to solve well head attached with ground
Climbing above and below near helps problem, and the fixing device of catching device can not be provided for deeper vertical shaft, inconvenient when using.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of simple in construction, easy to use, enhancing vertical shaft job safety
The novel silo emergency staircase of property.
The present invention solve the technical scheme that uses of its technical problem for：A kind of novel silo emergency staircase, it includes cat ladder, set
The extension ladder put the fixed frame in cat ladder upper end, the support bar that is arranged on the inside of fixed frame and be connected with cat ladder top；It is described solid
Determine " convex " font that frame is in lower ending opening, the U-shaped frame of the fixed frame including top and the holding frame being connected with the U-shaped frame,
Two extension curb girders of two curb girders or extension ladder of the U-shaped frame and cat ladder are hinged by axle, and the holding frame is horizontal
It is more than well head diameter to size；Described support bar one end is hinged with U-shaped frame by axle, and the movable end of the support bar is set
Put and the positioning hole being correspondingly arranged with through hole is set on through hole, the extension curb girder of the extension ladder, the through hole passes through with positioning hole
Pin is connected.The through hole and positioning hole are in the same size, and the movable end of support bar, which is rotated, can realize that through hole is overlapped with positioning hole,
Make pin also cross through hole and positioning hole, realize connection.The lateral dimension of the holding frame refer to " convex " font frame Far Left with
The vertical range of rightmost.
Further, the cat ladder is connected or by sliding block and cunning with extension ladder to be fixedly connected, by bolt progress axle
The flexible connection of rail.
It is preferred that, the top of the extension ladder sets fall prevention frame, two sides of the two ends of the fall prevention frame respectively with cat ladder
Beam is fixedly connected.
It is preferred that, the fall prevention frame includes cross bar and the montant being connected with curb girder, and one end of the cross bar is perpendicular by two
Bar is connected with curb girder, montant and extension curb girder formation triangle.
More excellent, the retainer ring being connected with catching device, the hook of catching device and fixed bail are fixedly installed on the cross bar
Hang connection.
It is preferred that, the bottom of the cat ladder curb girder is provided with indicator lamp, and the indicator lamp is connected with supply unit by circuit
Connect.
The cat ladder of the present invention is prior art, including two curb girders and multiple crossbeams for being arranged between curb girder, be may be selected
Vertical ladder or the telescopic cat ladder of length, cat ladder width are less than vertical shaft diameter to be onstructed；The width of the U-shaped frame and cat ladder width
Adapt to, it is U-shaped when being overlapped with plane where U-shaped frame with plane where cat ladder when extension ladder and cat ladder are with axle connection and flexible connection
Frame can frame cat ladder top and be preferred.
The positive effect of the present invention is：
1st, for not possessing the vertical shaft of emergency staircase, realize workmen in vertical shaft above and below, improve the convenience of construction；
2nd, determine that the vertical position, support bar and pin of cat ladder position horizontal level and the inclination angle of cat ladder by fixed frame
Degree, the stability that enhancing cat ladder is fixed, it is to avoid rocking and swinging for cat ladder, improve construction safety；
3rd, cat ladder bottom is provided with the indicator lamp being connected with supply unit, can effectively indicate cat ladder position, prevents construction
Personnel step on sky and fallen；
4th, as the extension on vertical shaft cat ladder top, workmen it is upper to ground when can grip the present invention cat ladder and continuation
Along along cat ladder to more than ground, upper well is more convenient and safe；
5th, fall prevention frame provides fixing point for catching device, and the hook of catching device, which is hooked, to be fixed in cross bar or retainer ring, is operated
Convenient, fixation, construction safety can avoid catching device from horizontally slipping when catching device is connected with retainer ring, enhancing fixation
Stability.
Brief description of the drawings
Fig. 1 is the structural representation of the embodiment of the present invention 1；
Fig. 2 is the structural representation of the embodiment of the present invention 2；
Fig. 3 is the structural representation of the embodiment of the present invention 3；
In accompanying drawing, 1 cat ladder, 11 curb girders, 12 indicator lamps, 2 fixed frames, 21 U-shaped frames, 22 holding frames, 3 support bars, 4 extensions
Ladder, 41 extension curb girders, 5 pins, 61 sliding blocks, 62 slide rails, 7 fall prevention frames, 71 cross bars, 72 montants, 73 retainer rings.
Embodiment
In order to facilitate the understanding of the purposes, features and advantages of the present invention, below in conjunction with present invention implementation
The drawings and specific embodiments in example, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that
Described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on the implementation in the present invention
Example, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made is belonged to
The scope of protection of the invention.
Embodiment 1
As shown in figure 1, embodiment 1 includes cat ladder 1, is arranged on the fixed frame 2 on the top of cat ladder 1, is arranged on the inner side of fixed frame 2
Support bar 3 and the extension ladder 4 that is connected with the top of cat ladder 1；The fixed frame 2 is in " convex " font of lower ending opening, the fixation
The holding frame 22 that frame 2 includes the U-shaped frame 21 on top and is connected with the U-shaped frame 21, the U-shaped frame 21 and two sides of cat ladder 1
Two extension curb girders 41 of beam 11 and extension ladder 4 are hinged by same axle, and the lateral dimension of holding frame 22 is more than well
Mouth diameter；Described one end of support bar 3 is hinged with U-shaped frame 21 by axle, and the movable end of the support bar 3 sets through hole,
Positioning hole corresponding with through hole is set on the extension curb girder 41 of the extension ladder 4, the through hole is connected with positioning hole by pin 5
Connect.
The cat ladder 1, to be fixedly connected, is specifically formed in one or is welded to connect with extension ladder 4.
The top for extending ladder 4 sets fall prevention frame 7, and the two ends of the fall prevention frame 7 extend with two of extension ladder 4 respectively
Curb girder 41 is fixedly connected.
The fall prevention frame 7 includes the cross bar 71 being connected with catching device and the montant 72 being connected with extension curb girder 41, the horizontal stroke
One end of bar 71 is connected by two montants 72 with extension curb girder 41.
The bottom of the curb girder 11 of cat ladder 1 is provided with indicator lamp 12, and the indicator lamp 12 is connected with supply unit by circuit
Connect.
In use, by the lower section of cat ladder 1 into vertical shaft, extension ladder 4 is exposed, by the frame of holding frame 22 on the ground by well head,
Position and the place plane of fixed frame 2 and the angle of extension ladder 4 of support bar 3 are adjusted, is aligned to through hole and positioning hole, with pin 5
Through through hole and positioning hole, positioning is realized, prevents cat ladder 1 from rocking.Upkeep operation persons wear's anti-fall device, the hook of catching device
Part hooks and is fixed on fall prevention frame 7, can effectively realize fixation.Indicator lamp 12 is opened, the bottom of cat ladder 1 can be distinguished, prevent from stepping on
Sky falls.On operating personnel arrive ground when, can hand catch extension ladder 4 continue climb, to more than pin up to ground, you can easily go out
Well.After operation is finished, pin 5 is extracted, by fixed frame 2 to the Plane Rotation of cat ladder 1, is moved easily.Cat ladder 1 can select lower end can
Flexible ladder, is adjusted according to shaft depths.
Embodiment 2
As shown in Fig. 2 embodiment 2 includes cat ladder 1, is arranged on the fixed frame 2 on the top of cat ladder 1, is arranged on the inner side of fixed frame 2
Support bar 3 and the extension ladder 4 that is connected with the top of cat ladder 1；The fixed frame 2 is in " convex " font of lower ending opening, the fixation
The holding frame 22 that frame 2 includes the U-shaped frame 21 on top and is connected with the U-shaped frame 21, the U-shaped frame 21 and two sides of cat ladder 1
Two extension curb girders 41 of beam 11 and extension ladder 4 are flexibly connected by same axle, and the lateral dimension of holding frame 22 is more than
Well head diameter；Described one end of support bar 3 is flexibly connected with U-shaped frame 21 by axle, and the movable end of the support bar 3 sets logical
Positioning hole corresponding with through hole is set on hole, the extension curb girder 41 of the extension ladder 4, and the through hole passes through pin 5 with positioning hole
Connection.
The cat ladder 1 carries out axle by bolt simultaneously with extension ladder 4 and fixed frame 2 and is connected.
The top for extending ladder 4 sets fall prevention frame 7, and the two ends of the fall prevention frame 7 extend with two of extension ladder 4 respectively
Curb girder 41 is fixedly connected.
The fall prevention frame 7 includes linking up with the cross bar 71 being connected and the montant 72 being connected with extension curb girder 41, institute with catching device
The one end for stating cross bar 71 is connected by two montants 72 with extension curb girder 41.Retainer ring 73, institute are fixedly installed on the cross bar 71
Retainer ring 73 is stated to be connected with the hook hook of catching device.
Cat ladder 1 is rotated to same plane with extension ladder 4 by axle when embodiment 2 is used, screwing bolts are fixed, and will branch
Strut 3 is connected with extension ladder 4, prevents ladder from rocking.Using cat ladder 1 is threaded into same plane with extension ladder 4 after finishing, and with consolidating
The U-shaped frame 21 for determining frame 2 frames both, is convenient for carrying.
Embodiment 3
As shown in figure 3, embodiment 3 includes cat ladder 1, is arranged on the fixed frame 2 on the top of cat ladder 1, is arranged on the inner side of fixed frame 2
Support bar 3 and the extension ladder 4 that is connected with the top of cat ladder 1；The fixed frame 2 is in " convex " font of lower ending opening, the fixation
The holding frame 22 that frame 2 includes the U-shaped frame 21 on top and is connected with the U-shaped frame 21, the U-shaped frame 21 and two sides of cat ladder 1
Beam 11 is flexibly connected by axle, and the lateral dimension of holding frame 22 is more than well head diameter；Described one end of support bar 3 with it is U-shaped
Frame 21 is flexibly connected by axle, and the movable end of the support bar 3 is set on through hole, the extension curb girder 41 of the extension ladder 4
Positioning hole corresponding with through hole is set, and the through hole is connected with positioning hole by pin 5.
The cat ladder 1 is connected with extension ladder 4 by the way that sliding block 61 and slide rail 62 are flexible, the prior art phase with existing extension ladder
Together.
The top for extending ladder 4 sets fall prevention frame 7, and the two ends of the fall prevention frame 7 extend with two of extension ladder 4 respectively
Curb girder 41 is fixedly connected.
The fall prevention frame 7 includes linking up with the cross bar 71 being connected and the montant 72 being connected with extension curb girder 41, institute with catching device
The one end for stating cross bar 71 is connected by two montants 72 with extension curb girder 41.
The bottom of the curb girder 11 of cat ladder 1 is provided with indicator lamp 12, and the indicator lamp 12 is connected with supply unit by circuit
Connect.
The cat ladder 1 and extension ladder 4 of embodiment 3 are identical with existing extension ladder technology from retractor device connection, are existing skill
Art.
Claims (5)
1. a kind of safety shaft ladder, it is characterised in that it includes cat ladder（1）, be arranged on cat ladder（1）The fixed frame of upper end（2）, set
Put in fixed frame（2）The support bar of inner side（3）With with cat ladder（1）The extension ladder of top connection（4）；The fixed frame（2）Under being in
" convex " font of end opening, the fixed frame（2）U-shaped frame including top（21）With with the U-shaped frame（21）Connected holding
Frame（22）, the U-shaped frame（21）With cat ladder（1）Two curb girders（11）Or extension ladder（4）Two extension curb girders（41）Pass through
Axle is hinged；The support bar（3）One end and U-shaped frame（21）It is hinged by axle, the support bar（3）Activity
End sets through hole, the extension ladder（4）Extension curb girder（41）It is upper that positioning hole corresponding with through hole, the through hole and positioning are set
Hole passes through pin（5）Connection；
The extension ladder（4）Top set fall prevention frame（7）, the fall prevention frame（7）Two ends respectively with extension ladder（4）Two
Extend curb girder（41）It is fixedly connected.
2. a kind of safety shaft ladder according to claim 1, it is characterised in that the cat ladder（1）With extension ladder（4）It is solid
It is fixed to connect, axle connection is carried out by bolt or passes through sliding block（61）And slide rail（62）Flexible connection.
3. a kind of safety shaft ladder according to claim 1, it is characterised in that the fall prevention frame（7）Including cross bar（71）
With with extension curb girder（41）The montant of connection（72）, the cross bar（71）One end pass through two montants（72）With extension curb girder
（41）Connection.
4. a kind of safety shaft ladder according to claim 3, it is characterised in that the cross bar（71）On be fixedly installed and prevent
Fall the retainer ring of device connection（73）.
5. a kind of safety shaft ladder according to claim 1, it is characterised in that the cat ladder（1）Curb girder（11）Bottom
It is provided with indicator lamp（12）, the indicator lamp（12）It is connected with supply unit by circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510073276.7A CN104695848B (en) | 2015-02-12 | 2015-02-12 | A kind of novel silo emergency staircase |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510073276.7A CN104695848B (en) | 2015-02-12 | 2015-02-12 | A kind of novel silo emergency staircase |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104695848A CN104695848A (en) | 2015-06-10 |
| CN104695848B true CN104695848B (en) | 2017-07-21 |
Family
ID=53343355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510073276.7A Active CN104695848B (en) | 2015-02-12 | 2015-02-12 | A kind of novel silo emergency staircase |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104695848B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2936214A1 (en) * | 2016-07-14 | 2018-01-14 | Richard Milton | Ladder safety device |
| CN106522825B (en) * | 2016-10-28 | 2018-02-16 | 五冶集团上海有限公司 | A kind of collapsible vertical ladder removed for dry gas holder wallboard |
| CN109667532A (en) * | 2019-01-03 | 2019-04-23 | 信义超薄玻璃(东莞)有限公司 | Glass production line maintenance platform |
| CN111877971A (en) * | 2020-09-04 | 2020-11-03 | 上海伸仕金属制品有限公司 | Movable anti-falling assembly, movable anti-falling crawling ladder and protection method thereof |
| KR102706210B1 (en) * | 2023-11-01 | 2024-09-12 | (주) 디케이금속 | Ladder for valve room |
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| US4892170A (en) * | 1989-04-27 | 1990-01-09 | Avanti International | Portable ladder assembly |
| JPH09177105A (en) * | 1995-12-26 | 1997-07-08 | Kanesou Kk | Ladder for manhole |
| FR2804332B1 (en) * | 2000-01-31 | 2002-04-19 | Applic Mecanique Electr Et Fri | SECURE ACCESS DEVICE WITHIN A STRUCTURE, PARTICULARLY A TANK PROVIDED WITH AN OPENING |
| US6607053B1 (en) * | 2000-09-26 | 2003-08-19 | William Paul Warren | Retractable safety cage |
| KR20030096995A (en) * | 2002-06-18 | 2003-12-31 | 인텍엔지니어링 주식회사 | Ladder for ascend and descend of manhole |
| CN101818576A (en) * | 2010-04-23 | 2010-09-01 | 中天建设集团有限公司 | Safe escape device for ultra-high-rise building core tube construction |
| CN201635643U (en) * | 2009-12-04 | 2010-11-17 | 沈立秋 | Well mouth safety ladder |
| CN201843537U (en) * | 2010-11-11 | 2011-05-25 | 中国石油天然气股份有限公司 | Portable polished rod clip dismounting staircase |
| DE102011009049A1 (en) * | 2011-01-20 | 2012-07-26 | Günzburger Steigtechnik Munk GmbH | Fall protection device for climbing device, particularly ladder and manhole step, comprises running rail reaching over ceiling and safety runner connected with person climbing ladder |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110158783A1 (en) * | 2009-12-24 | 2011-06-30 | Consolidated Edison Company Of New York, Inc. | Ladder system |
-
2015
- 2015-02-12 CN CN201510073276.7A patent/CN104695848B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4877999U (en) * | 1971-12-24 | 1973-09-26 | ||
| US4892170A (en) * | 1989-04-27 | 1990-01-09 | Avanti International | Portable ladder assembly |
| JPH09177105A (en) * | 1995-12-26 | 1997-07-08 | Kanesou Kk | Ladder for manhole |
| FR2804332B1 (en) * | 2000-01-31 | 2002-04-19 | Applic Mecanique Electr Et Fri | SECURE ACCESS DEVICE WITHIN A STRUCTURE, PARTICULARLY A TANK PROVIDED WITH AN OPENING |
| US6607053B1 (en) * | 2000-09-26 | 2003-08-19 | William Paul Warren | Retractable safety cage |
| KR20030096995A (en) * | 2002-06-18 | 2003-12-31 | 인텍엔지니어링 주식회사 | Ladder for ascend and descend of manhole |
| CN201635643U (en) * | 2009-12-04 | 2010-11-17 | 沈立秋 | Well mouth safety ladder |
| CN101818576A (en) * | 2010-04-23 | 2010-09-01 | 中天建设集团有限公司 | Safe escape device for ultra-high-rise building core tube construction |
| CN201843537U (en) * | 2010-11-11 | 2011-05-25 | 中国石油天然气股份有限公司 | Portable polished rod clip dismounting staircase |
| DE102011009049A1 (en) * | 2011-01-20 | 2012-07-26 | Günzburger Steigtechnik Munk GmbH | Fall protection device for climbing device, particularly ladder and manhole step, comprises running rail reaching over ceiling and safety runner connected with person climbing ladder |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104695848A (en) | 2015-06-10 |
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