CN111674414A - Foldable ladder with lock for locomotive - Google Patents
Foldable ladder with lock for locomotive Download PDFInfo
- Publication number
- CN111674414A CN111674414A CN202010690537.0A CN202010690537A CN111674414A CN 111674414 A CN111674414 A CN 111674414A CN 202010690537 A CN202010690537 A CN 202010690537A CN 111674414 A CN111674414 A CN 111674414A
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- Prior art keywords
- locking
- ladder
- connecting rod
- locomotive
- lock
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- 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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- 230000003137 locomotive effect Effects 0.000 title claims abstract description 53
- 230000008602 contraction Effects 0.000 claims abstract description 37
- 238000003825 pressing Methods 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 241000282326 Felis catus Species 0.000 description 14
- 230000009194 climbing Effects 0.000 description 7
- 230000009193 crawling Effects 0.000 description 7
- 238000010276 construction Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
- B61D23/00—Construction of steps for railway vehicles
- B61D23/02—Folding steps for railway vehicles, e.g. hand or mechanically actuated
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ladders (AREA)
Abstract
The invention discloses a foldable ladder stand with a lock for a locomotive, which comprises two stand columns, wherein a plurality of crosspieces are arranged between the two stand columns, a contraction locking device is arranged on the crosspiece of the ladder stand, the contraction locking device comprises a contraction device and a locking device, the contraction device comprises a rotating rod mechanism, the rotating rod mechanism comprises two rotating rods arranged on the crosspieces, and a connecting rod is arranged between the rotating rods; the contraction device also comprises two connecting rod limiting blocks, wherein a limiting table and two communicated upper guide holes and lower guide holes are arranged on the connecting rod limiting blocks, the limiting table is arranged at the connecting tangent of the upper guide holes and the lower guide holes, and the connecting rod is rotatably connected with the lower guide holes; and locking devices for locking the connecting rods to prevent the connecting rods from rotating are arranged on the upper guide holes of the two connecting rod limiting blocks of the contraction device, and the two connecting rod limiting blocks are connected with the locomotive wall. The ladder stand can be contracted and locked, so that the space is saved, and a non-worker can not open the ladder.
Description
Technical Field
The invention belongs to the field of rail shunting locomotives, and particularly relates to a roof climbing ladder for overhauling the roof of a shunting locomotive.
Background
Nowadays, large-scale locomotive kind is various, for example crane, hoist, large truck etc. its common denominator is exactly that the size is big, and the carriage is higher from ground, is provided with the required equipment of locomotive on the locomotive roof, consequently, the staff often need go up the locomotive top, installs and debugs these equipment, like electric locomotive, be equipped with the pantograph on its roof, main circuit breaker, high voltage isolator, high voltage transformer, high voltage connector, support equipment such as insulator, consequently, the ladder of climbing the top is essential equipment, is convenient for the staff on and off.
However, the locomotive roof maintenance generally uses an aerial ladder or a roof climbing ladder to climb the roof, and the roof climbing is difficult without the aerial ladder, so that potential safety hazards exist; if the ladder is directly arranged on the locomotive, when the locomotive stops working, the situation that non-working personnel climb the roof through the ladder possibly exists, and certain potential safety hazards exist.
Disclosure of Invention
The technical problem solved by the invention is as follows: the utility model provides a collapsible area lock cat ladder for locomotive adopts a collapsible folding ladder, when the maintenance operation is stepped on to needs, pulls out the staff normal operation of stepping on the top with the ladder, and when non-operating condition, the folding ladder of shrink makes the ladder hug closely the locomotive wall, and non-operating personnel can't use the ladder to step on the top, and the back of contracting simultaneously dies the ladder anti-climb device lock, and non-operating personnel can't open the ladder.
The technical scheme adopted by the invention is as follows:
a foldable ladder stand with a lock for a locomotive comprises two upright posts, wherein a plurality of crosspieces are arranged between the two upright posts, a contraction locking device is arranged on the crosspiece of the ladder stand and comprises a contraction device and a locking device, the contraction device comprises a rotating rod mechanism, the rotating rod mechanism comprises two rotating rods arranged on the crosspieces, and a connecting rod is arranged between the rotating rods; the contraction device also comprises two connecting rod limiting blocks, wherein a limiting table and two communicated upper guide holes and lower guide holes are arranged on the connecting rod limiting blocks, the limiting table is arranged at the connecting tangent of the upper guide holes and the lower guide holes, and the connecting rod is rotatably connected with the lower guide holes; and locking devices for locking the connecting rods to prevent the connecting rods from rotating are arranged on the upper guide holes of the two connecting rod limiting blocks of the contraction device, and the two connecting rod limiting blocks are connected with the locomotive wall.
Preferably, the upper part and the lower part of the ladder stand are respectively provided with a contraction device, and the upper guide hole of the contraction device arranged at the lower part of the ladder stand is provided with a locking device for locking the connecting rod.
Preferably, the contraction device arranged on the upper portion of the crawling ladder is arranged on a first crosspiece on the upper portion of the crawling ladder, and the contraction device arranged on the lower portion of the crawling ladder is arranged on a penultimate crosspiece on the lower portion of the crawling ladder.
Preferably, the locking device comprises two shaft pins, the shaft pins penetrate through the upper guide holes and are tightly attached to the connecting rod, the two shaft pins penetrate through the pressing plate, and through holes are formed in the pressing plate; the locking device further comprises a locking plate which is inserted into the through hole and can move axially along the through hole, the locking plate is arranged on the wall of the locomotive, a first locking hole is formed in the locking plate, the first locking hole is arranged on the lower portion of the locking plate and tightly attached to the pressing plate, and a lock is arranged in the first locking hole.
Preferably, the upper part of the locking plate is provided with a second locking hole.
Preferably, the connecting rod limiting block and the lock catch plate are both connected with the mounting plate, and the mounting plate is connected with the locomotive wall.
Preferably, the connecting rod limiting block and the lock catch plate are welded on the mounting plate, and the mounting plate is connected to the locomotive wall in a bolt connection mode.
Preferably, the upright posts and the crosspieces are steel pipes, and the connecting rod limiting blocks and the mounting plates are steel structures.
The foldable ladder with the lock for the locomotive realizes the contraction and folding through the rotary rod structure and the connecting rod limiting block of the contraction device, does not occupy the installation space of equipment in the locomotive and the space of the locomotive roof, saves the space, and simultaneously, the connecting rod limiting block of the device is provided with the locking device to prevent the connecting rod in the rotary rod from rotating, so that the contracted ladder is locked, and non-working personnel can not open the ladder, thereby preventing the non-working personnel from climbing the locomotive roof through the ladder.
Drawings
FIG. 1 is a front view of a ladder stand in an open state;
FIG. 2 is a sectional view B-B of FIG. 1;
FIG. 3 is a main body view of the ladder stand in a closed state;
FIG. 4 is a cross-sectional view C-C of FIG. 3;
fig. 5 is a sectional view a-a of fig. 3.
Wherein, the names corresponding to the reference numbers are:
1-upright post, 2-crosspiece, 3-rotating rod mechanism, 31-rotating rod, 32-connecting rod, 4-connecting rod limiting block, 41-upper guide hole, 42-lower guide hole, 43-limiting table, 5-shaft pin, 6-pressing plate, 7-locking plate, 71-first locking hole, 72-second locking hole, 8-lock and 9-mounting plate.
Detailed Description
The present invention will be further described with reference to the following description and examples, which include but are not limited to the following examples.
Example 1
A foldable ladder stand with a lock for a locomotive is shown in figures 1-5 and comprises two upright posts 1, a plurality of crosspieces 2 are arranged between the two upright posts 1, contraction locking devices are arranged on the crosspieces 2 and comprise contraction devices and locking devices, each contraction device comprises a rotating rod mechanism 3, each rotating rod mechanism 3 comprises two rotating rods 31 arranged on the crosspieces, and a connecting rod 32 is arranged between the rotating rods 31; the contraction device further comprises two connecting rod limiting blocks 4, wherein a limiting table 43 and two communicated upper guide holes 41 and lower guide holes 42 are arranged on each connecting rod limiting block 4, the limiting table 43 is arranged at a connecting tangent of the upper guide holes 41 and the lower guide holes 42, and the connecting rod 32 is rotatably connected with the lower guide holes 42; the upper guide holes 41 of the two connecting rod limiting blocks 4 of the retractor are provided with locking devices for locking the connecting rod 32 to prevent the connecting rod from rotating, and the two connecting rod limiting blocks 4 are connected with the locomotive wall.
The foldable ladder stand with the lock comprises two upright posts 1 and a plurality of transverse 2 steps arranged on the two upright posts 1 to form the ladder stand, wherein a contraction locking device is arranged on the transverse 2 and comprises a contraction device used for the contraction and locking device of the ladder stand to lock the contracted ladder stand, the contraction device comprises a rotating rod mechanism 3, the rotating rod mechanism 3 comprises two rotating rods 31 arranged on the transverse 2, the two rotating rods 31 can rotate around the transverse 2, a connecting rod 32 is arranged between the two rotating rods 31, and the connecting rod 32 is rotatably connected with lower guide holes 42 of two connecting rod limiting blocks 4 arranged on the wall of a locomotive, so that the lower guide holes 42 are provided with upper guide holes 41 communicated with the lower guide holes, and the connecting tangent lines of the upper guide holes 41 and the lower guide holes 42 are provided with limiting tables 43; therefore, when the ladder is contracted, as shown in fig. 3-5, the ladder is lifted and pushed towards the locomotive wall, the rotating rod 31 rotates to be parallel to the upright post 1, the connecting rod 32 is placed in the lower guide hole 42, the ladder is tightly attached to the locomotive wall, and is in a contracted state, and at the moment, a locking device for preventing the connecting rod 32 from rotating is arranged on the upper guide hole 41, so that the function of locking the contracted ladder is achieved; when the ladder stand needs to be opened, as shown in figures 1-2, the locking device is opened, and when the rotary rod 31 rotates to be vertical to the upright post 1, the connecting rod 32 rotates to pass through the joint of the upper guide hole 41 and the lower guide hole 42 at the lower guide hole 42 to the upper guide hole 41, and the rotary rod 31 is supported by the limiting platform 43, and the ladder stand is separated from the wall by the distance of the rotary rod 31, so that a worker can conveniently climb to the roof along the ladder stand crosspiece 2 to install, debug or overhaul the locomotive equipment. In this embodiment, the locking device may be used as long as it can lock the link 32 placed in the lower guide hole 42 against rotation, thereby enabling the ladder to be locked to the wall of the motorcycle. According to the foldable ladder stand with the lock, when the ladder is required to be jacked for maintenance operation, the ladder is pulled out, workers normally jack the ladder through the ladder stand crosspiece 2, the foldable ladder is contracted to be tightly attached to the wall of a locomotive in a non-working state, so that the ladder stand does not occupy the space of equipment in the locomotive and does not occupy the space of the roof of the locomotive, the space is saved, and meanwhile, the ladder stand is tightly locked in a contracted state to prevent the non-workers from climbing.
Example 2
Based on the above embodiment 1, as shown in fig. 1 to 4, the upper and lower parts of the ladder are provided with one retractor respectively, and the upper guide hole 41 of the retractor placed at the lower part of the ladder is provided with the locking means for locking the link 32. In this embodiment, the cat ladder sets up two constriction devices in upper portion and lower part, further consolidates the cat ladder, guarantees that the staff is climbing safety. Meanwhile, a locking device for locking the connecting rod 32 is arranged on an upper guide hole of the contraction device arranged at the lower part of the crawling ladder, so that the crawling ladder is locked in a contraction state, and an operator can conveniently open the crawling ladder on the ground. In this embodiment, other undescribed contents are the same as those in the above embodiment, and are not described again here.
Example 3
Based on the embodiment 2, as shown in fig. 1-4, the contraction device arranged on the upper part of the ladder stand is arranged on the first crosspiece 2 on the upper part of the ladder stand, and the contraction device arranged on the lower part of the ladder stand is arranged on the penultimate crosspiece 2 on the lower part of the ladder stand. The design position of constriction device on cat ladder has specifically been described in this embodiment, works as on the constriction device that cat ladder upper portion set up arranges first crosspiece 2 on cat ladder upper portion in, when the constriction device that cat ladder lower part set up arranges in on cat ladder lower part penultimate rung 2, the atress is even on the cat ladder, just when the constriction device that cat ladder lower part set up arranges in on cat ladder lower part penultimate rung 2, highly just to operating personnel, makes things convenient for staff's operation to be in the locking device of cat ladder lower part. In this embodiment, other undescribed contents are the same as those in the above embodiment, and are not described again here.
Example 4
Based on the above embodiments 1-3, as shown in fig. 1-5, the locking device includes two shaft pins 5, the shaft pins 5 penetrate through the upper guiding holes 41 and are tightly attached to the connecting rods 32, the two shaft pins 5 penetrate through the pressing plate 6, and the pressing plate 6 is provided with through holes; the locking device further comprises a locking plate 7 which is inserted into the through hole and can move along the axial direction of the through hole, the locking plate 7 is arranged on the wall of the locomotive, a first locking hole 71 is formed in the locking plate 7, the first locking hole 71 is arranged on the lower portion of the locking plate 7 and tightly attached to the pressing plate 6, and a lock 8 is arranged in the first locking hole 71. The embodiment specifically describes the structure of the locking device, which includes two shaft pins 5 penetrating through the upper guiding holes 41 and closely attached to the connecting rods 32, wherein the shaft pins 5 lock the connecting rods 32 through the pressing plate 6 to prevent the connecting rods 32 from rotating, and the pressing plate 6 locks 8 through the first locking holes 71 of the locking plate 7 penetrating through the through holes of the pressing plate 6 and disposed on the wall of the locomotive. When the locking device needs to be opened, as shown in fig. 1-2, an operator uses a key to open a lock on a first locking hole 71 on a lock catch plate 7, the ladder is pulled outwards, a shaft pin 5 does not lock a connecting rod 32 any more, the connecting rod 32 rotates to enable a rotating rod 31 to be perpendicular to a stand column 1, and a limiting table 43 limits the rotating rod 31, so that the ladder is opened. When locking, as shown in fig. 3-5, the ladder stand is pushed towards the locomotive wall, the ladder stand automatically falls back downwards by gravity, the connecting rod 32 is placed in the lower guide hole 42, the shaft pin 5 is tightly attached to the connecting rod 32, the pressing plate 6 is locked 8 through the first locking hole 71 of the locking plate 7, and therefore the connecting rod 32 is locked to prevent rotation, and the ladder stand is contracted and locked. The locking device in this implementation simple structure, and through the mode locking of locking, consequently, need the key to open, through only the mode of being equipped with the key to the staff to prevent under non-operating condition, non-staff opens the ladder and climbs. In this embodiment, other undescribed contents are the same as those in the above embodiment, and are not described again here.
Example 5
Based on the above embodiment 4, as shown in fig. 1 and fig. 3, the latch plate 7 is provided with a second locking hole 72 at the upper part. In this embodiment, the second locking hole 72 is formed in the upper portion of the locking plate 7, so that when the lock 8 on the ladder stand is opened, a worker cannot conveniently lift the lock 8 to climb the top and is easy to lose the lock 8, and therefore when the lock 8 on the ladder stand is opened, the lock 8 can be locked in the second locking hole 72, and the operation of the worker is facilitated. In this embodiment, other undescribed contents are the same as those in the above embodiment, and are not described again here.
Example 6
Based on the above embodiment 5, as shown in fig. 1 to 5, the connecting rod limiting block 4 and the locking plate 7 are both connected with the mounting plate 9, and the mounting plate 9 is connected with the locomotive wall. In this embodiment, the connecting rod limiting block 4 and the locking plate 7 are installed on one installation plate 9 in a concentrated manner, and when the ladder stand is installed on a locomotive wall, only the installation plate 9 is installed and connected with the locomotive wall, so that the ladder stand is convenient to install. In this embodiment, other undescribed contents are the same as those in the above embodiment, and are not described again here.
Example 7
Based on the embodiment 6, the connecting rod limiting block 4 and the locking plate 7 are welded on the mounting plate 9, and the mounting plate 9 is connected to the locomotive wall in a bolt connection mode. In the embodiment, the connection mode of the connecting rod limiting block 4, the locking plate 7 and the mounting plate 9 is specifically described as welding, but the connecting rod limiting block and the locking plate are not limited to the above connection mode, as long as the connecting rod limiting block and the locking plate can play a role in fixed connection; the mounting plate 9 is connected to the wall of the motorcycle by bolts, but is not limited to the above-mentioned connection method as long as it can perform a fixed connection function. In this embodiment, other undescribed contents are the same as those in the above embodiment, and are not described again here.
Example 8
Based on above-mentioned embodiment 6 or 7, stand 1 and crosspiece 2 are the steel pipe, connecting rod stopper 4 and mounting panel 9 are the steel construction. In this embodiment, mainly expounded stand 1 and crosspiece 2's material be the steel pipe, and connecting rod stopper 4 and mounting panel 9 are the steel construction, adopt 45 steel. Adopt the cat ladder of above-mentioned material preparation, sound construction, and seven some kilograms of total weight, the staff need not open the cat ladder with the help of external force. In this embodiment, other undescribed contents are the same as those in the above embodiment, and are not described again here.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (8)
1. A foldable ladder stand with a lock for a locomotive is characterized in that a contraction locking device is arranged on the crosspiece of the ladder stand, the contraction locking device comprises a contraction device and a locking device, the contraction device comprises a rotating rod mechanism, the rotating rod mechanism comprises two rotating rods arranged on the crosspiece, and a connecting rod is arranged between the rotating rods; the contraction device also comprises two connecting rod limiting blocks, wherein a limiting table and two communicated upper guide holes and lower guide holes are arranged on the connecting rod limiting blocks, the limiting table is arranged at the connecting tangent of the upper guide holes and the lower guide holes, and the connecting rod is rotatably connected with the lower guide holes; and locking devices for locking the connecting rods to prevent the connecting rods from rotating are arranged on the upper guide holes of the two connecting rod limiting blocks of the contraction device, and the two connecting rod limiting blocks are connected with the locomotive wall.
2. The foldable ladder with lock for locomotive according to claim 1, wherein the upper and lower parts of said ladder are respectively provided with a contracting device, and the upper guide hole of the contracting device arranged at the lower part of the ladder is provided with a locking device for locking the connecting rod.
3. The foldable ladder with lock for the locomotive as claimed in claim 2, wherein the contraction device arranged on the upper part of the ladder is arranged on the first crosspiece on the upper part of the ladder, and the contraction device arranged on the lower part of the ladder is arranged on the penultimate crosspiece on the lower part of the ladder.
4. The foldable ladder with lock for the locomotive according to any one of claims 1-3, wherein the locking device comprises two shaft pins, the shaft pins penetrate through the upper guide holes and are tightly attached to the connecting rod, the two shaft pins penetrate through the pressing plate, and through holes are formed in the pressing plate; the locking device further comprises a locking plate which is inserted into the through hole and can move axially along the through hole, the locking plate is arranged on the wall of the locomotive, a first locking hole is formed in the locking plate, the first locking hole is arranged on the lower portion of the locking plate and tightly attached to the pressing plate, and a lock is arranged in the first locking hole.
5. The ladder with the lock for the locomotive according to claim 4, wherein a second locking hole is formed in an upper portion of the locking plate.
6. The foldable ladder with lock for locomotive according to claim 5, wherein said connecting rod limiting block and said locking plate are connected to a mounting plate, said mounting plate being connected to a locomotive wall.
7. The foldable ladder with lock for locomotives according to claim 6, wherein said connecting rod limiting block and said locking plate are welded to said mounting plate, said mounting plate is connected to the locomotive wall by means of bolt connection.
8. The foldable ladder with the lock for the locomotive according to claim 6 or 7, wherein the upright posts and the crosspieces are steel pipes, and the connecting rod limiting blocks and the mounting plates are steel structures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010690537.0A CN111674414B (en) | 2020-07-17 | 2020-07-17 | Foldable crawling ladder with lock for locomotive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010690537.0A CN111674414B (en) | 2020-07-17 | 2020-07-17 | Foldable crawling ladder with lock for locomotive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111674414A true CN111674414A (en) | 2020-09-18 |
| CN111674414B CN111674414B (en) | 2024-04-19 |
Family
ID=72457771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010690537.0A Active CN111674414B (en) | 2020-07-17 | 2020-07-17 | Foldable crawling ladder with lock for locomotive |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111674414B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD100675A1 (en) * | 1972-11-28 | 1973-10-05 | ||
| CN201049632Y (en) * | 2007-06-11 | 2008-04-23 | 中国北车集团大同电力机车有限责任公司 | Folding suspension type locomotive top climbing ladder |
| CN206327266U (en) * | 2016-12-23 | 2017-07-14 | 扬州中集通华专用车有限公司 | Tank car and its cat ladder |
| DE102017002018A1 (en) * | 2017-03-03 | 2018-09-06 | Knorr-Bremse Gesellschaft Mit Beschränkter Haftung | Schiebetrittanordnung for a motor vehicle or for a rail vehicle |
| CN208181068U (en) * | 2018-03-16 | 2018-12-04 | 比亚迪股份有限公司 | Emergency Ladder for vehicle and the rail vehicle with it |
| CN108974023A (en) * | 2018-07-20 | 2018-12-11 | 长春冠信瑞达轨道客车配件有限公司 | A kind of subway drivers' cab use is foot-operated |
| CN111098872A (en) * | 2018-10-29 | 2020-05-05 | 比亚迪汽车工业有限公司 | Escape ladder, rail vehicle and rail transit system |
| CN212332651U (en) * | 2020-07-17 | 2021-01-12 | 中车资阳机车有限公司 | Foldable ladder with lock for locomotive |
-
2020
- 2020-07-17 CN CN202010690537.0A patent/CN111674414B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD100675A1 (en) * | 1972-11-28 | 1973-10-05 | ||
| CN201049632Y (en) * | 2007-06-11 | 2008-04-23 | 中国北车集团大同电力机车有限责任公司 | Folding suspension type locomotive top climbing ladder |
| CN206327266U (en) * | 2016-12-23 | 2017-07-14 | 扬州中集通华专用车有限公司 | Tank car and its cat ladder |
| DE102017002018A1 (en) * | 2017-03-03 | 2018-09-06 | Knorr-Bremse Gesellschaft Mit Beschränkter Haftung | Schiebetrittanordnung for a motor vehicle or for a rail vehicle |
| CN208181068U (en) * | 2018-03-16 | 2018-12-04 | 比亚迪股份有限公司 | Emergency Ladder for vehicle and the rail vehicle with it |
| CN108974023A (en) * | 2018-07-20 | 2018-12-11 | 长春冠信瑞达轨道客车配件有限公司 | A kind of subway drivers' cab use is foot-operated |
| CN111098872A (en) * | 2018-10-29 | 2020-05-05 | 比亚迪汽车工业有限公司 | Escape ladder, rail vehicle and rail transit system |
| CN212332651U (en) * | 2020-07-17 | 2021-01-12 | 中车资阳机车有限公司 | Foldable ladder with lock for locomotive |
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| Publication number | Publication date |
|---|---|
| CN111674414B (en) | 2024-04-19 |
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