CN104176575B - Protection board of elevator - Google Patents
Protection board of elevator Download PDFInfo
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- CN104176575B CN104176575B CN201410204732.2A CN201410204732A CN104176575B CN 104176575 B CN104176575 B CN 104176575B CN 201410204732 A CN201410204732 A CN 201410204732A CN 104176575 B CN104176575 B CN 104176575B
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- protective plate
- main material
- reinforcing material
- elevator
- main
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- Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
- Elevator Door Apparatuses (AREA)
- Cage And Drive Apparatuses For Elevators (AREA)
Abstract
The present invention provides a protection board of an elevator which is capable of improving the strength and inhibiting the reduction of transmission efficiency. The protection board (15) is disposed on the wall of an elevating channel of the elevator. The protection board (15) is provided with a main material (21) and a reinforcing material (22), wherein the main material (21) is provided with a planar surface. The planar surface is allowed to be fixed on the wall of the elevating channel through a fixation member (middle support) of the wall of the elevating channel in such a way that: the planar surface is parallel to the moving direction of the elevator carriage. The reinforcing material (22) is allowed to be mounted on the main material (21) in such a way that the reinforcing material (22) is prevented from dropping off from the main material (21).
Description
Technical field
The present invention relates to a kind of protective plate of elevator (fascia plate), its lifting for being suitable as being arranged on elevator is led to
Elevator protection plate on road wall is used.
Background technology
Protective plate is the component arranged to prevent elevator passenger from dropping in liftway from lift car, according to building
Build the requirement of basic taper method, it is necessary to towards the gateway of lift car liftway arrange protective plate, and the protective plate with
The distance between threshold of lift car must be in below 125mm.As noted previously, as the purpose for arranging protective plate is in order to anti-
Only passenger is dropped in liftway, so needing with certain intensity, some protective plates are increased using reinforcing material
By force.
Even if for example Patent Document 1 discloses one kind also can keep certain when there occurs earthquake between elevator
The protective plate of distance.In the protective plate disclosed in patent documentation 1, realized by arranging reinforcing material at the back side of protective plate
The intensity of regulation.
Citation
Patent documentation
Patent documentation 1：Japanese Patent Laid-Open 2009-120303 publication
Brief summary of the invention
The invention problem to be solved
However, in the protective plate disclosed in patent documentation 1, although by overleaf being strengthened and energy with reinforcing material
Enough guarantee intensity, but in the packaging needed for being transported, there is a problem of that thickness is thickening because arranging reinforcing material.Additionally,
Because the volume of the protective plate after packaging becomes big, so there is a problem of that conevying efficiency declines, cost of transportation rises.
The content of the invention
The present invention is completed in the case of in view of the problems referred to above, it is an object of the invention to provide one kind can increase
Plus the protective plate of the elevator of the reduction of intensity and suppression conevying efficiency.
Solution
In order to solve the above problems, the present invention provides a kind of protective plate of elevator, and the protective plate of the elevator is arranged on elevator
Lifting channel wall on, it is characterised in that the protective plate of the elevator has main material and reinforcing material, and the main material has
The face of tabular, by the lifting channel wall fixed component and so that the mobile side of the face of the tabular and lift car
It is fixed on the lifting channel wall to parallel mode, the reinforcing material can be with will not be de- from the main material after installation
The mode for falling is arranged on the main material.
Invention effect
In accordance with the invention it is possible to the intensity for guaranteeing to specify by reinforcing material, also, due to protecting in packaging
The main material of plate is separately packed with reinforcing material, it is possible to improving conevying efficiency.
Description of the drawings
Fig. 1 is provided with the side view of the elevator lifting channel of the protective plate involved by one embodiment of the present invention.
Fig. 2 is the front view or top view of protective plate (main material).
Fig. 3 is front view, top view or the side view of reinforcing material.
Fig. 4 is the explanatory diagram of installation steps when reinforcing material is installed on protective plate (main material).
Fig. 5 is front view, upward view or the side view of the protective plate for being provided with reinforcing material.
Fig. 6 is the explanatory diagram of the otch sectional hole patterns on protective plate (main material).
Fig. 7 is the details figure of the abutment portion being provided with the protective plate of reinforcing material.
Fig. 8 is the exemplary plot of intermediate support and the stationary state of protective plate.
Fig. 9 is other exemplary plots of intermediate support and the stationary state of protective plate.
Description of reference numerals is as follows：
1 lift car
2 balance weights
3 hoist engines
4 main hoist cables
5 elevator control gears
6 car doors
7 door drives
8 car thresholds
9 lifting channel walls
10 elevator lobbies
11 layers of door
12 lintels
13 layers of gate threshold
14 safety screens
15 protective plates
Support above 16 lintels
17 intermediate supports
21 (21B～21D) main materials
21a, 21b installing hole
22 reinforcing materials
22a, 22b insertion section
22c, 22d stage portion
Specific embodiment
(1) one embodiment of the present invention
Fig. 1 is provided with the side view of the elevator lifting channel of the protective plate involved by one embodiment of the present invention.With
It is lower the configuration example of the elevator of the protective plate involved by being provided with present embodiment is illustrated with reference to Fig. 1.
(1-1) configuration example of elevator
Lift car 1 is taken for elevator passenger, and balance weight 2 is arranged on lift car to improve the power consumption efficiency of elevator
1 opposition side.As shown in figure 1, lift car 1 and balance weight 2 are linked by main hoist cable 4, and by the volume as motor
Raise machine 3 and be hung as well-bucket shape.With the traction of 3 pairs of main hoist cables 4 of hoist engine, lift car 1 and balance weight 2 are along (not shown)
Guide rail is lifted.The action of hoist engine 3 is controlled by control board for elevator 5, therefore, lift car 1 and balance weight 2 are in elevator controlling
It is driven up and down in liftway under the control of disk 5.
There is car door 6, car door 6 can be opened and closed under the control of door drive 7 on lift car 1.Car
Door 6 can be in the presence of the driving force from door drive 7, along the guide rail being formed in the door drive 7 of top
(not shown) and the guiding groove (not shown) being formed on the car threshold 8 of lower section are smoothly opened and closed action.
On the other hand, the elevator lobby in building side is to open when elevator lobby 10 is provided with passenger's upper and lower lift car 1
The layer door 11 for closing.Layer door 11 can along be formed in top lintel (header) 12 in guide rail (not shown) and be formed in
Guiding groove (not shown) on the layer gate threshold 13 of lower section is smoothly opened and closed action.The on-off action of layer door 11 is controlled so as to
The on-off action of car door 6 is linked with door drive 7.It should be noted that in the lower section of layer gate threshold 13 along vertical
Direction is provided with the protection board for preventing passenger from falling i.e. safety screen 14 (toe guard).
Protective plate 15 is the tabular component arranged in order to ensure the safety of elevator passenger.As described above, lift car 1 exists
Move up and down in liftway under the control of control board for elevator 5.When there occurs the accidents such as earthquake or fire, elevator
Car 1 may stop between floors, and also be likely to occur the situation that car door 6 is opened between floors.Above-mentioned
In the case of, if lift car 1 with it is relative to lifting channel wall 9 between horizontal direction distance it is excessive, it is likely that send out
Raw passenger drops into the situation in liftway from lift car 1.In order to prevent the above-mentioned danger fallen, more logical than lifting
Road wall 9 is provided with protective plate 15 closer to the position of car threshold 8.For example, the front end of car threshold 8 with it is relative to lifting
Horizontal range between conduit wall 9 (referring to the wall in liftway) is in the case that i.e. horizontal clearance has exceeded 125mm, Yi Jian
In the case that the gap of full vertical dimension between the lower end of baffle plate 14 and the upper end of lintel 12 has exceeded 38mm, need in safety
Protective plate 15 is set between baffle plate 14 and lintel 12.The setting quantity of protective plate 15 can according to safety screen 14 and lintel 12 it
Between gap distance determining.Additionally, protective plate 15 and lintel 12 are fixed by the support 16 above lintel, protective plate
15 are fixed each other by the intermediate support 17 being fixed on lifting channel wall 9.In addition, safety screen 14 and protective plate
As connection of the connection between 15 between protective plate 15, can be fixed by intermediate support 17.
(1-2) basic structure of protective plate
The protective plate 15 involved by present embodiment is described in detail below.As described above, protective plate 15 be in order to
Prevent passenger from the component arranged in liftway is dropped into from lift car 1, so needing certain intensity (for example, in office
The unit area of meaning position is 5cm2Position vertically apply 300N equal distribution load when flexure in below 15mm).It is anti-
Backplate 15 has the face of tabular, and so that the face of the tabular (above-below direction in Fig. 1) parallel with the moving direction of lift car 1
Mode be fixed on the fixed component (equivalent to intermediate support 17) of lifting channel wall 9.
In general, as a kind of method for guaranteeing protective plate intensity, it may be considered that increase the gold for making protective plate
The thickness (thickness of slab) of category plate.Although the method can improve intensity, the increase of thickness can cause the weight of protective plate significantly
Increase, so homework burden when can not only cause Assembling operation increases, can also cause the labour transported to needed for scene
Rise with the burden of time and cost of transportation.As other methods, for example, carry out also by the metallic plate to protective plate
Ribs shaping etc. processes to improve intensity.But, when using the method, except exist because need to carry out in advance complexity into
Shape is processed and can caused outside the problem of cost increase, if carrying out that the intensity of regulation still can not be obtained after ribs shaping,
There is still a need for intensity is improved by increasing thickness of slab, so there is a problem of same as mentioned above.For above-mentioned reasons, this reality
Apply the protective plate 15 involved by mode and employ by overleaf arranging reinforcing material method to increase intensity.
Protective plate 15 involved by present embodiment is made up of the main material 21 of tabular and the reinforcing material 22 of U-shaped.It is main
Material 21 with of the prior art by pair not adopting reinforcing material to carry out enhanced protective plate identical tabular component to implement this
The distinctive shape of embodiment is processed and formed, it is preferred to use with metal of intensity to a certain degree above etc..Main material 21
Illustrate in aftermentioned part with reference to Fig. 2 and Fig. 3 with the shape of reinforcing material 22.All parts (the main material 21 of protective plate 15
With reinforcing material 22) it is characterised by, in transport, main material 21 and reinforcing material 22 can separately be packed and transported,
When protective plate 15 is arranged on into liftway, reinforcing material 22 can be arranged on main material 21.
Fig. 2 is the front view or top view of protective plate (main material).As shown in Fig. 2 main material 21 has rectangle
The shape of the both side ends bending of tabular component, in the upper end of front view the installing hole as incision hole is formed about
21b, it is used to install reinforcing material 22 (insertion section 22a described later).The installing hole as incision hole is formed with lower end
21a, it is used to install reinforcing material 22 (insertion section 22b described later).It should be noted that installing hole 21a, 21b are formed as
The otch hole width of vertical direction of the otch hole width (height) of the vertical direction of installing hole 21a more than installing hole 21b is (high
Degree).
Fig. 3 is front view, top view or the side view of reinforcing material.As shown in figure 3, reinforcing material 22 has rectangle
Tabular component each rim portion shape for bending to lid and being formed.In front view, the top of reinforcing material 22 is formed in
Insertion section 22a is the part in the installing hole 21b for insert main material 21, is formed in the insertion section 22b of the lower section of reinforcing material 22 and is
Part in the installing hole 21a of insertion main material 21.In view of main material 21 and the thickness of slab of reinforcing material 22, in insertion section 22a
Stage portion 22c for guaranteeing step difference is provided with, 22b is provided with stage portion 22d for guaranteeing step difference in insertion section.It is logical
Cross and above-mentioned stage portion 22c, 22d is set, when reinforcing material 22 is arranged on main material 21, excessive load can be avoided
Act in abutment portion.In addition, 22a length in vertical direction in insertion section is formed as than insertion section 22b in vertical direction
On length it is long.
Fig. 4 is the explanatory diagram of installation steps when reinforcing material is installed to protective plate (main material).First, such as Fig. 4 (a) institutes
Show, the insertion section 22a of reinforcing material 22 is inserted in the installing hole 21b of main material 21.Then, as shown in Fig. 4 (b), enhancing is made
Material 22 is rotated until overlap with main material 21, hereafter and by insertion section 22b is inserted in installing hole 21a.Finally, such as Fig. 4 (c) institutes
Show, while main material 21 is secured against into movement, while making reinforcing material 22 towards the slid underneath of figure to stage portion 22d, 22c
The position that abuts with the bottom of installing hole 21a, 21b respectively of bottom.Reinforcing material 22 after slip is with main material 21 in regulation
Position at link.
By carrying out a series of number of assembling steps shown in Fig. 4, it is not necessary to use instrument, it becomes possible to which reinforcing material 22 is pacified
Being mounted in can complete the assembling of protective plate 15 on main material 21.Fig. 5 is the front view of the protective plate for being provided with reinforcing material, faces upward
View or side view.Protective plate 15 shown in Fig. 5 is so that installing hole 21b is above and the underlying modes of installing hole 21a
It is arranged on lifting channel wall 9.As a result, in protective plate 15, reinforcing material 22 is because acting on the gravity of its own (certainly
Weight) and pulled downward, so, even if reinforcing material 22 is not fastened on main material 21, reinforcing material 22 does not have yet
The danger dropped.I.e. it is capable to reinforcing material 22 is mounted to come off from main material 21 after mounting.
(1-3) the making example of the abutment portion in main material and reinforcing material
It should be noted that as the system of the main material 21 and the respective abutment portion of reinforcing material 22 for constituting protective plate 15
Make example, various making examples can be adopted.One of the making example of main material 21 is illustrated referring to Fig. 6 and Fig. 7, and
The making example of reinforcing material 22 is illustrated with reference to Fig. 8 and Fig. 9.
Fig. 6 is the explanatory diagram of the otch sectional hole patterns on protective plate (main material), and Fig. 7 is the protective plate for being provided with reinforcing material
In abutment portion details figure.Fig. 6 (a) is the front view of main material 21, Fig. 6 (b)～Fig. 6 (d) be along Fig. 6 (a) A～
The sectional view of B lines, represents respectively the otch sectional hole patterns of different shapes in main material 21.
And, the main material 21B shown in Fig. 6 (b) as the main material 21 with reference to illustrated by Fig. 2～Fig. 5, is formed as
The shape of otch is simply defined in installing hole 21a, 21b part.Fig. 7 (a) is the enlarged drawing near installing hole 21a, is shown
State when being provided with reinforcing material 22 on main material 21B.Width d1 shown in Fig. 7 (a) is by the insertion of reinforcing material 22
The width in the space that portion 22b is installed to installing hole 21a and is formed.
Then, there is the main material 21C shown in Fig. 6 (c) rear side in installing hole 21a, 21b to be provided with the shape of nappe
Shape, the nappe is used to cover each when insertion section 22b, 22a of reinforcing material 22 are inserted into the rear side of installing hole 21a, 21b
Individual insertion section 22b, 22a.Fig. 7 (b) is the enlarged drawing near installing hole 21a, shows and is provided with strengthening material on main material 21C
State when expecting 22.Width d2 shown in Fig. 7 (b) is the situation that the insertion section 22b of reinforcing material 22 is installed to installing hole 21a
The width in the space of generation.Here, width d2 is less than the width d1 shown in Fig. 7 (a).
Therefore, by comparing width d1 and d2 it is recognised that compared with the shape of main material 21B, the shape of main material 21C
It is more beneficial for the degree for suppressing the intensity caused by the otch space for forming installing hole 21a to decline.I.e. it is capable to improve
The overall intensity relative to the power in horizontal direction of protective plate 15.Additionally, in the main material 21D shown in Fig. 6 (d), installing
The rear side of hole 21a, 21b is provided with and is inserted into insertion section 22b, 22a of the reinforcing material 22 of the dorsal part of installing hole 21a, 21b
The nappe for more closely contacting, so compared with main material 21C, can further suppress the intensity caused because of otch space
The degree of decline, can further improve the intensity relative to normal load of the entirety of protective plate 15.
Fig. 8 is the exemplary plot of intermediate support and the stationary state of protective plate.It is middle as illustrated in (1-1)
Support 17 is by protective plate 15 by the upper part of fixed protection plate 15, end portion or upper part and end portion
The component being fixed on lifting channel wall 9, as intermediate support 17, can adopt general fixed installation fitting etc..Example
Such as, as shown in Fig. 8 and Fig. 9 described later, by the way that a part for the main material 21 of protective plate 15 is fixed on intermediate support 17
And protective plate 15 is fixed on intermediate support 17.Protective plate 15 shown in Fig. 8 on main material 21 by installing reinforcing material
22 and improve the intensity as protective plate.When the power of the horizontal direction of figure is acted on protective plate 15, protective plate is acted on
Normal load on 15 is transmitted by main material 21 and the standing part of intermediate support 17 to the side of lifting channel wall 9.
Fig. 9 is other exemplary plots of intermediate support and the stationary state of protective plate.Protective plate 15 shown in Fig. 9 takes
The power of the horizontal direction of accompanying drawing can promote when acting on protective plate 15 normal load to intermediate support 17 transmit so as to
Reduction acts on the measure of the burden on protective plate 15.In detail, as shown in figure 9, by reinforcing material 22 relative to protection
The length of plate 15 be set as it is longer than the length relative to protective plate 15 of the reinforcing material 22 shown in Fig. 8, as a result, with
In the standing part that intermediate support 17 is fixed, insertion section 22a (or 22b) is overlap with intermediate support 17 across main material 21.
The protective plate 15 of the reinforcing material 22 of above-mentioned position relationship can be constituted according to use, there is the power of the horizontal direction of figure in effect
When, acting on the normal load on protective plate 15 can be delivered to intermediate support by insertion section 22a, 22b of reinforcing material 22
17, so compared with the situation shown in Fig. 8, the normal load acted on protective plate 15 can be mitigated.Also, due to subtracting
Burden of the catheresis on protective plate 15, it is possible to mitigate the flexure that may be produced in protective plate 15, it is anti-with improving
Effect of the backplate 15 relative to the relative intensity of the power in horizontal direction.
(1-4) effect of present embodiment
Protective plate 15 according to involved by present embodiment, by the way that reinforcing material 22 is arranged on main material 21, can
Make protective plate 15 that there is the intensity of regulation.Also, due to main material 21 and reinforcing material 22 separately can be packed in packaging,
It is possible to improving conevying efficiency and suppressing cost of transportation to rise.Also, due to can be by 22 points of main material 21 and reinforcing material
Packaging is opened, so the effect in the space for saving equipment site of storage can also be obtained.
In addition, the protective plate 15 according to involved by present embodiment, due to step that can be according to Fig. 4, does not make
With in the case of instrument protective plate 15 is assembled by the way that reinforcing material 22 is arranged on main material 21, it is possible to side
Just assembling operation and is effectively carried out.Further, since need not be using special for installing and fix reinforcing material 22
Installing component on protective plate 21, so the effect for occurring arranging defect because of the defect of installing component can also be achieved without
Really.
(2) other examples
In the above description, the reinforcing material 22 of the protective plate 15 involved by present embodiment is respectively arranged respectively one
Insertion section 22a, 22b, and be respectively arranged respectively in main material 21 one with this etc. the corresponding installing hole 21b in insertion section,
21a.But the present invention is not limited to this, for example, multiple insertion section 22a, 22b can also be set on reinforcing material 22, and it is main
Material 21 can also be configured to arrange it is multiple with this etc. insertion section corresponding installing hole 21b, 21a.Also, relative to 1 main material
The number of the reinforcing material 22 of material 21 is also not limited to above-mentioned 1 couple 1, can change number according to required intensity.
Additionally, thickness of slab and section shape of main material 21 and reinforcing material 22 shown in Fig. 1 to Fig. 9 etc. is for implementing
One of protective plate 15 involved by one embodiment of the present invention, the thickness of slab and section shape etc. can also be according to protective plates
Intensity needed for 15 carries out appropriate design.
The present invention is not limited in above-mentioned embodiment, can include various modifications example.For example, in order that the present invention's says
It is bright to be easily understood, above-mentioned embodiment has been described in detail, but be not meant to possess and all carried out explanation
Structure.Furthermore, it is possible to other structures a part for the structure of embodiment be added, deleted and replaced.
In addition, in the protective plate 15 of the elevator involved by above-mentioned embodiment, main material 21 is the face with tabular, is borrowed
Help the component (intermediate support 17) fixed of lifting channel wall 9 parallel with the moving direction of lift car 1 with the face of the tabular
Mode be fixed on one of the main material on lifting channel wall 9, reinforcing material 22 is can be with will not be from main material after installation
21 modes for coming off are arranged on of the reinforcing material on main material 21.Additionally, installing hole 21a, 21b are in order in main material
One of the 21 at least two hole portions installed reinforcing materials 22 and cut out on the face of tabular, insertion section 22a, 22b are
One of at least two insertion section in the hole portion (installing hole 21b, 21a) of the insertion main material 21 of reinforcing material 22.
Claims (3)
1. a kind of protective plate of elevator, the protective plate of the elevator is arranged on the lifting channel wall of elevator, it is characterised in that
The protective plate of the elevator has main material and reinforcing material,
The main material has the face of tabular, by the lifting channel wall fixed component and so that the face of the tabular
The mode parallel with the moving direction of lift car is fixed on the lifting channel wall,
The reinforcing material can be arranged on the main material in the way of it will not come off from the main material after installation,
The insertion section of the reinforcing material on the main material across the main material and with the lifting channel wall
Fixed component overlap.
2. the protective plate of elevator according to claim 1, it is characterised in that
The main material has cut out on the face of the tabular at least two in order to install the reinforcing material
Hole portion,
The reinforcing material has at least two insertion section of the hole portion of the insertion main material,
A hole portion in the hole portion is inserted in an insertion section in the insertion section, then by other insertion sections
Other hole portions are inserted, thus the reinforcing material is arranged on the main material.
3. the protective plate of elevator according to claim 2, it is characterised in that
The reinforcing material on the main material slides along the direction parallel with the face of the tabular of the main material,
Thus the reinforcing material links at the position of regulation with the main material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013106063A JP6088353B2 (en) | 2013-05-20 | 2013-05-20 | Elevator plate |
| JP2013-106063 | 2013-05-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104176575A CN104176575A (en) | 2014-12-03 |
| CN104176575B true CN104176575B (en) | 2017-05-10 |
Family
ID=51957971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410204732.2A Active CN104176575B (en) | 2013-05-20 | 2014-05-15 | Protection board of elevator |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6088353B2 (en) |
| CN (1) | CN104176575B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6469253B2 (en) * | 2015-12-07 | 2019-02-13 | 三菱電機株式会社 | Evacuation device for elevator |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101269775A (en) * | 2007-03-20 | 2008-09-24 | 株式会社日立建筑系统 | Protection plate for elevator |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5841765U (en) * | 1981-09-12 | 1983-03-19 | フジテツク株式会社 | Fetish plate device for elevators |
| JPS5968775U (en) * | 1982-10-29 | 1984-05-10 | 株式会社東芝 | elevator |
| JP2003171073A (en) * | 2001-12-06 | 2003-06-17 | Toshiba Elevator Co Ltd | Elevator fascia plate |
| JP2003327371A (en) * | 2002-05-13 | 2003-11-19 | Hitachi Building Systems Co Ltd | Fascia plate for elevator |
| JP4329316B2 (en) * | 2002-09-04 | 2009-09-09 | 三菱電機株式会社 | Seismic isolated elevator elevator plate |
| JP5241205B2 (en) * | 2007-11-13 | 2013-07-17 | 三菱電機株式会社 | Elevator plate |
-
2013
- 2013-05-20 JP JP2013106063A patent/JP6088353B2/en active Active
-
2014
- 2014-05-15 CN CN201410204732.2A patent/CN104176575B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101269775A (en) * | 2007-03-20 | 2008-09-24 | 株式会社日立建筑系统 | Protection plate for elevator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104176575A (en) | 2014-12-03 |
| JP2014227238A (en) | 2014-12-08 |
| JP6088353B2 (en) | 2017-03-01 |
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