CN105314495B - Lift car bottom safety device - Google Patents
Lift car bottom safety device Download PDFInfo
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- CN105314495B CN105314495B CN201410377974.1A CN201410377974A CN105314495B CN 105314495 B CN105314495 B CN 105314495B CN 201410377974 A CN201410377974 A CN 201410377974A CN 105314495 B CN105314495 B CN 105314495B
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- toeguard
- collision block
- lift car
- hinge
- buffer collision
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Abstract
This application discloses a kind of lift car bottom safety device, including：--- toeguard, lift car bottom is rotatably mounted to by first axle；With deployed condition, folded state.--- buffer collision block, lift car bottom is rotatably mounted to by second hinge；The buffer collision block has deployed condition, folded state.--- link gear, it is rigid element, one end connects toeguard by third hinge, and the other end passes through the 4th hinge connection buffer collision block or lift car bottom；Link gear causes toeguard and buffer collision block while is in deployed condition or folded state.--- toeguard is linked up with, and is fixed on lift car close to the bottom of the position of car door；When toeguard is folded state, toeguard hooks toeguard and makes it keep folded state constant.It can be can be applied to this application provides a kind of with synchronous expansion, the toeguard of synchronous folding and buffer collision block in the environment of shallow pit.
Description
Technical field
The application is related to a kind of safety device of lift car bottom, more particularly to toeguard and buffer collision block.
Background technology
Referring to Fig. 1, lift car 10 moves up and down along car guide rail 20 in elevator hoistways 30, and on demand each
Elevator floor stops 40 are stopped.There is the toeguard 11 extended vertically downward in the adjacent car door side in the bottom of lift car 10, this
It is one piece of sheet metal, there is the inclined-plane towards the direction of elevator hoistways 30 in end, total height is not less than 750mm.Work as elevator car
When railway carriage or compartment 10 hinders and rests on non-landing position (such as above a certain stop) and need to save passenger and leave lift car 10 for some reason,
Elevator toe guard 11 is used to prevent passenger from crashing into elevator hoistways 30.Also there is buffering in the middle position of the bottom of lift car 10
Device collision block 12, this is a rigid element extended downwardly, for example, steel plate.Corresponding, in elevator hoistways pit 31
Car buffer 32 is additionally provided with, this is elastomeric element or hydraulic mechanism.When lift car 10 hinders and when falling for some reason, buffer
Collision block 12 and car buffer 32 clash and absorb impact, prevent lift car 10 from directly hitting elevator hoistways pit 31.
In order to ensure maintenance personal's safety, the bottom surface of national Specification elevator hoistways pit and the lowest part of lift car
0.5m distance is at least left between part.However, the old elevator hoistways pit depth of some early stages building often do not reach it is above-mentioned
The regulation of standard, referred to as shallow pit.After old elevator expires and scrapped, in order to meet requirements of the national standard, it is necessary to building
Carry out secondary construction and deepen elevator hoistways pit.But it is difficult to deepen pit in putting into practice, cost is also expensive, therefore is had
Solution when a kind of shallow pit elevator space for maintenance of necessity research is inadequate.
For the situation of shallow pit, the existing safety device for being arranged on lift car bottom or elevator hoistways pit, example
Such as following four parts of patent document disclosure of that.
Publication No. CN101061051A, publication date disclose one for the Chinese invention patent application on October 24th, 2007
The safety device for being used to protect maintenance personal that kind is set in shallower elevator shaft bottom.This safety device is set in shaft bottom
One dagger that can horizontally or vertically place, the dagger is positioned horizontally with the height reduced in elevator normal operation, in people
The dagger is sit upright so as to eliminate the danger that operator is weighed wounded in shaft bottom when member enters elevator.This application is confined to
It is elastic buffer in the buffer positioned at elevator car (also referred to as car) bottom, therefore is only applicable to rated speed of lift and exists
Situation within 1m/s.When rated speed of lift exceeds 1m/s, elevator industry is usually using ripe hydraulic bjuffer.Hydraulic pressure
If buffer is arranged on lift car bottom, oil leakage phenomenon easily be present, and follow car vibrations and operation to make for a long time
Oil leak aggravates；In addition conventional maintenance oiling and state-detection are carried out to hydraulic bjuffer will become to be not easy to carry out.
The Chinese utility model that Authorization Notice No. is CN202226493U, authorized announcement date is on May 23rd, 2012 discloses
A kind of mechanical device for being used to protect maintenance personal set in the pit of elevator hoistways.This mechanical device is by one
Serial complicated mechanical structure ensures to form a safety inspection space between lift car bottom surface and elevator hoistways pit.Should
Car buffer is arranged in elevator hoistways pit by application, thus can be used for the situation that rated speed of lift exceeds 1m/s；
It is not dominant in cost but realizing for its mechanism is complex.
The Chinese invention patent application that application publication number is CN102701057A, data of publication of application is on October 3rd, 2012
Disclose a kind of lift car toeguard.The toeguard by upper piece, bottom sheet form, wherein bottom sheet is rotatable.In lift car position
When bottom, retracted state is presented in the toeguard；Remaining when, the toeguard present deployed condition.This application grows week in elevator
In the operation of phase, mechanism frequent movement need to be faced and caused integrity problem, it is not dominant in cost.It is worth noting that,
When new elevator is installed in existing building, national standard allows to deploy toeguard manually in overhauling elevator, in normal operation
Toeguard is made to be in retracted state, so can be simpler than the scheme of the automatic drawing back toeguard of this application, mechanism reliability is more
It is high.
The Chinese utility model that Authorization Notice No. is CN201058781Y, authorized announcement date is on May 14th, 2008 discloses
A kind of elevator shallow pit safety apparatus.This safety device includes the bearing buffer for being arranged on elevator hoistways pit, also
Lift car toeguard comprising automatically retractable.Both parts are independently run, and wherein bearing buffer is by manually pressing
Need to load and unload, toeguard is then configured with electric switch and detects and realize Automatic-expanding and withdrawal.
The content of the invention
Technical problems to be solved in this application are to provide a kind of lift car bottom safety device, toeguard therein and
Buffer collision block not only can deploy but also can fold, and simple to operate, safety.
In order to solve the above technical problems, the application lift car bottom safety device includes：
--- toeguard, it is a block of metal plate, lift car is rotatably mounted to close to car by first axle
The bottom of the position of door；The toeguard has overall in vertical deployed condition and after the rotation of elevator floor stops direction
Folded state；
--- buffer collision block, it is rigid element, the bottom of lift car is rotatably mounted to by second hinge；Should
Buffer collision block has the folded state of vertical deployed condition and level；When buffer collision block is deployed condition, with electricity
The position of car buffer set by terraced well pit is relative；
--- link gear, it is rigid element, one end connects toeguard by third hinge, and the other end passes through the 4th hinge
Connect buffer collision block or lift car bottom；Link gear cause toeguard and buffer collision block be in simultaneously deployed condition or
Folded state；
--- toeguard is linked up with, and is fixed on lift car close to the bottom of the position of car door；When toeguard is rugosity
During state, toeguard hooks toeguard and makes it keep folded state constant.
The application lift car bottom safety device provides a kind of can be eased up with the toeguard of synchronous expansion, synchronous folding
Device collision block is rushed, goes for situation of the car buffer for elastic buffer or hydraulic bjuffer.In elevator normal work,
The safety device is folded state.When elevator will overhaul, the safety device is deployed condition.Therefore, the application can answer
In environment for shallow pit, it can also be applied to naturally in the environment of normal pit.In control aspect, by manually realizing exhibition
The conversion of open state and folded state, it is easy to operate and safe and reliable, eliminate the circuit design of complexity.
Brief description of the drawings
Fig. 1 is the overall schematic of elevator；
Fig. 2 a, Fig. 2 b are the deployed condition of the embodiment of the present application one, folded state schematic diagram respectively；
Fig. 3 a, Fig. 3 b are the deployed condition of the embodiment of the present application two, folded state schematic diagram respectively；
Fig. 4 is a kind of principle schematic of embodiment of the toeguard hook in the application.
Description of reference numerals in figure：
10 be lift car；11 be toeguard；12 be buffer collision block；20 be car guide rail；30 be elevator hoistways；31 are
Elevator hoistways pit；32 be car buffer；40 be stop；2 be car floor suspension bracket；3 be that folding position switchs；4 be expanded position
Switch；5 be spring；7 be link gear；8 be that toeguard is linked up with；81 be mounting seat；82 be spring two；83 be Removable hook；91
For first axle；92 be second hinge；93 be third hinge；94 be the 4th hinge；95 be bindiny mechanism.
Embodiment
Fig. 2 a and Fig. 2 b are referred to, this is the embodiment one of the application lift car bottom safety device, and it includes：
--- toeguard 11, it is a block of metal plate, lift car 10 is rotatably mounted to by first axle 91 and leaned on
The bottom (i.e. sill bottom) of the position of nearly car door.The direction that the toeguard 11 can deviate from elevator floor stops 40 rotates.Work as spats
When plate 11 deploys, overall in vertically, vertically downward, only end tilts its main part away from the direction of elevator floor stops 40.Work as spats
It is overall close to level when plate 11 folds, depending on first axle 91 and the line of the fixed position of toeguard hook 8.
--- buffer collision block 12, is rigid element, and lift car 10 is rotatably mounted to by second hinge 92
Bottom, the bottom center of lift car 10 is typically secured to, is preferably fixed to car floor suspension bracket 2.The buffer collision block 12 is, for example,
Cylinder or cube, can with toeguard 11 it is equidirectional rotate.When buffer collision block 12 deploys, overall is in vertical, and its
Position is relative with the car buffer 32 positioned at elevator hoistways pit 31.It is overall in level when buffer collision block 12 folds.
--- folding position switch 3, lift car bottom 1 is arranged on, such as be arranged on car floor suspension bracket 2.Open folding position
Close 3 only when buffer collision block 12 folds in place be pressurized triggering, remaining when be non-pressured state.
--- expanded position switch 4, lift car bottom 1 is arranged on, such as be arranged on car floor suspension bracket 2.Expanded position is opened
Close 4 only when buffer collision block 12 deploys in place be pressurized triggering, remaining when be non-pressured state.
--- spring 5, one end connection buffer collision block 12, other end connection lift car bottom 1 (such as car floor suspension bracket
2) side of elevator floor stops 40, is deviated from positioned at buffer collision block 12.Spring 5 is pressurized always, and when buffer collision block 12 folds
The compression degree of spring 5 is more than the compression degree of the spring 5 when buffer collision block 12 deploys.In other words, spring 5 will be given all the time
Buffer collision block 12 is given to be transformed to the elastic force of deployed condition from folded state.
--- link gear 7, it is rigid structure, its one end connects toeguard 9 by third hinge 93, and its other end passes through
4th hinge 94 connection buffer collision block 12.Third hinge 93 is located at the lower section of first axle 91, and the 4th hinge 94 is located at second
The lower section of hinge 92, therefore the line between first axle 91 and second hinge 92 and link gear 7 are non-intersect, this four hinges
Relative position ensure that buffer collision block 12 and toeguard 11 have identical rotation direction.
--- toeguard hook 8, lift car 10 is fixed on close to the bottom of the position of car door (i.e. sill bottom), and
And toeguard hook 8 positioned at the inner sides of toeguard 11 be toeguard hook 8 than toeguard 11 further from elevator floor stops 40.
In the embodiment one, folding position switch 3, expanded position switch 4, spring 5 can omit.
The method of work of the lift car bottom safety device of embodiments herein one is as follows：
In elevator normal operation, the safety device is in the folded state shown in Fig. 2 b.Toeguard 11 is with first axle
91 be that axle is turned to close to horizontal position, and toeguard 11 is fixed by toeguard hook 8.Buffer collision block 12 is with the second hinge
Chain 92 is that axle turns to horizontal level, and identical with the rotation direction of toeguard 11.Folding position switch 3 is pressured state, exhibition
Open position switch 4 is non-pressured state.
When elevator prepares to overhaul, maintainer takes toeguard 11 from toeguard hook 8 from the doorway of elevator floor stops 40
Under.Due to Action of Gravity Field and the elastic force of spring 5, toeguard 11 and buffer collision block 12 will all recover vertical deployed condition,
As shown in Figure 2 a.Now expanded position switch 4 be pressured state, and it is non-pressured state that folding position, which switchs 3, buffer collision block 12
The space for maintenance with certain altitude is formd between car buffer 32, it is sufficient to ensure maintainer's safety in pit.
After the completion of upkeep operation, maintainer inwardly promotes toeguard 11 from the doorway of elevator floor stops 40 again, rigid
Motivation structure 7 drives the 12 equidirectional rotation of buffer collision block therewith.When toeguard 11 folds in place, maintainer is fixed in again
Toeguard hook 8, now the safety device is in the folded state shown in Fig. 2 b.In folding process, spring 5 provides resistance all the time
Hinder the elastic force of folding.
Fig. 3 a and Fig. 3 b are referred to, this is the embodiment two of the application lift car bottom safety device, and it includes：
--- toeguard 11, it is a block of metal plate, lift car 10 is rotatably mounted to by first axle 91 and leaned on
The bottom (i.e. sill bottom) of the position of nearly car door.The direction that the toeguard 11 can deviate from elevator floor stops 40 rotates.Work as spats
When plate 11 deploys, overall in vertically, vertically downward, only end tilts its main part away from the direction of elevator floor stops 40.Work as spats
It is overall close to level when plate 11 folds, depending on first axle 91 and the line of the fixed position of toeguard hook 8.
--- buffer collision block 12, is rigid element, and lift car 10 is rotatably mounted to by second hinge 92
Bottom, the bottom center of lift car 10 is typically secured to, is preferably fixed to car floor suspension bracket 2.The buffer collision block 12 is, for example,
Cylinder or cube, it can in reverse direction rotate with toeguard 11 and be rotated towards the direction of elevator floor stops 40.When buffer is hit
When block 12 deploys, overall is in vertical, and its position is relative with the car buffer 32 positioned at elevator hoistways pit 31.Work as buffer
It is overall in level when collision block 12 folds.
--- folding position switch 3, lift car bottom 1 is arranged on, such as be arranged on car floor suspension bracket 2.Open folding position
Close 3 only when buffer collision block 12 folds in place be pressurized triggering, remaining when be non-pressured state.
--- expanded position switch 4, lift car bottom 1 is arranged on, such as be arranged on car floor suspension bracket 2.Expanded position is opened
Close 4 only when buffer collision block 12 deploys in place be pressurized triggering, remaining when be non-pressured state.
--- spring 5, one end connection buffer collision block 12, other end connection lift car bottom 1 (such as car floor suspension bracket
2), positioned at buffer collision block 12 towards the side of elevator floor stops.Spring 5 is always pressured state, and in the folding of buffer collision block 12
The compression degree of spring 5 is more than the compression degree of the spring 5 when buffer collision block 12 deploys when folded.In other words, spring 5 will begin
The elastic force that buffer collision block 12 is transformed to deployed condition from folded state is given eventually.
--- link gear 7, it is rigid structure, its one end connects toeguard 9 by third hinge 93, and its other end passes through
4th hinge 94 connects lift car bottom 1 (such as car floor suspension bracket 2).In lift car bottom 1, (such as car floor suspension bracket 2) has
One section of guide rail (not shown), the 4th hinge 94 are slidably secured in the guide rail.4th hinge 94 also passes through bindiny mechanism 95
Buffer collision block 12 is connected close to the side of elevator floor stops 40, bindiny mechanism 95 is the rigid portion being connected on buffer collision block 12
Part, and bindiny mechanism 95 and buffer collision block 12 are located at the both sides of second hinge 92 respectively.Third hinge 93 is positioned at the first hinge
The lower section of chain 91, the 4th hinge 94 are located at the top of second hinge 92, therefore the company between first axle 91 and second hinge 92
Line intersects with link gear 7, and the relative position of this four hinges ensure that buffer collision block 12 with toeguard 11 with opposite
Rotation direction.
--- toeguard hook 8, lift car 10 is fixed on close to the bottom of the position of car door (i.e. sill bottom), and
And toeguard hook 8 positioned at the inner sides of toeguard 11 be toeguard hook 8 than toeguard 11 further from elevator floor stops 40.
In the embodiment two, folding position switch 3, expanded position switch 4, spring 5 can omit.
The method of work of the lift car bottom safety device of embodiments herein two is as follows：
In elevator normal operation, the safety device is in the folded state shown in Fig. 3 b.Toeguard 11 is with first axle
91 be that axle is turned to close to horizontal position, and toeguard 11 is fixed by toeguard hook 8.Buffer collision block 12 is with the second hinge
Chain 92 is that axle turns to horizontal level, and opposite with the rotation direction of toeguard 11.4th hinge 94, which is located at it, to be fixed in guide rail
Farthest away from one end of elevator floor stops 40, bindiny mechanism 95 drives buffer collision block 12 to fold.Folding position switch 3 is compression shape
State, expanded position switch 4 is non-pressured state.
When elevator prepares to overhaul, maintainer takes toeguard 11 from toeguard hook 8 from the doorway of elevator floor stops 40
Under.Due to Action of Gravity Field and the elastic force of spring 5, toeguard 11 and buffer collision block 12 will all recover vertical deployed condition,
As shown in Figure 3 a.Now the 4th hinge 94 is located at it and fixed in guide rail closest to one end of elevator floor stops 40；Expanded position switch 4
For pressured state, folding position switch 3 is non-pressured state, and being formd between buffer collision block 12 and car buffer 32 has
The space for maintenance of certain altitude, it is sufficient to ensure maintainer's safety in pit.
After the completion of Awaiting Overhaul operation, maintainer inwardly promotes toeguard 11 from the doorway of elevator floor stops again, rigid
Motivation structure 7 drives the opposite direction of buffer collision block 12 to rotate therewith.When toeguard 11 folds in place, maintainer is fixed in again
Toeguard hook 8, now the safety device is in the folded state shown in Fig. 3 b.In folding process, spring 5 provides resistance all the time
Hinder the elastic force of folding.
Toeguard hook 8 in above-mentioned two embodiment can have a variety of implementations, only provide a kind of realization side below
Formula is as example.Referring to Fig. 4, toeguard hook 8 includes mounting seat 81, spring 2 82, Removable hook 83.The mounting seat 81
Inside has a receiving space, and spring 2 82 is located in the receiving space, and the part or entirety of Removable hook 83 all may be used
In the receiving space.Spring 2 82 is fixed between a side wall of the receiving space of mounting seat 81 and Removable hook 83.
During 2 82 normal extension of spring, a part for Removable hook 83 is located in the receiving space of mounting seat 81, therefore spring 2 82 carries
For hindering Removable hook 83 to be fully retracted the elastic force of the receiving space.Removable hook 83 can reliably hook toeguard 11, example
Such as hook the edge or perforate or annex thereon of toeguard 11.
The preferred embodiment of the application is these are only, is not used to limit the application.Come for those skilled in the art
Say, the application there can be various modifications and variations.All any modifications within spirit herein and principle, made, it is equal
Replace, improve etc., it should be included within the protection domain of the application.
Claims (6)
1. a kind of lift car bottom safety device, it is characterized in that, including：
--- toeguard, it is a block of metal plate, lift car is rotatably mounted to close to car door by first axle
The bottom of position；The toeguard has entirety in vertical deployed condition and the folding after the rotation of elevator floor stops direction
State；
--- buffer collision block, it is rigid element, the bottom of lift car is rotatably mounted to by second hinge；The buffering
Device collision block has the folded state of vertical deployed condition and level；When buffer collision block is deployed condition, with elevator
The position of car buffer set by road pit is relative；
--- link gear, it is rigid element, one end connects toeguard by third hinge, and the other end passes through the 4th hinge connection
Buffer collision block or lift car bottom；Link gear causes toeguard and buffer collision block while is in deployed condition or folding
State；
--- toeguard is linked up with, and is fixed on lift car close to the bottom of the position of car door；When toeguard is folded state,
Toeguard hooks toeguard and makes it keep folded state constant.
2. lift car bottom safety device according to claim 1, it is characterized in that, in addition to：
--- folding position switchs, and be pressurized triggering only when buffer collision block is folded state；
--- expanded position switchs, and be pressurized triggering only when buffer collision block is deployed condition.
3. lift car bottom safety device according to claim 1, it is characterized in that, in addition to：
--- spring, connection buffer collision block and lift car bottom；Spring is pressurized always, and the bullet when buffer collision block folds
The compression degree of spring is more than the compression degree of the spring when buffer collision block deploys.
4. lift car bottom safety device according to claim 1, it is characterized in that, one end of link gear passes through the 3rd
Hinge connection toeguard, the other end pass through the 4th hinge connection buffer collision block；
Third hinge is located at the lower section of first axle, and the 4th hinge is located at the lower section of second hinge；
From deployed condition be transformed to folded state or from folded state be transformed to deployed condition when, buffer collision block and toeguard have
There is identical rotation direction.
5. lift car bottom safety device according to claim 1, it is characterized in that, one end of link gear passes through the 3rd
Hinge connection toeguard, the other end pass through the 4th hinge connection lift car bottom；There is one section of guide rail in lift car bottom,
4th hinge is slidably secured in the guide rail；It is close that 4th hinge also connects buffer collision block by rigid bindiny mechanism
The side of elevator floor stops；
Third hinge is located at the lower section of first axle, and the 4th hinge is located at the top of second hinge；
From deployed condition be transformed to folded state or from folded state be transformed to deployed condition when, buffer collision block and toeguard have
There is opposite rotation direction.
6. lift car bottom safety device according to claim 1, it is characterized in that, toeguard hook comprising mounting seat,
Spring two, Removable hook；There is a receiving space inside the mounting seat, spring two is located in the receiving space, and activity is hung
A part for hook is integrally located in the receiving space；Spring two is fixed on a side wall and the activity of the receiving space of mounting seat
Between hook；Removable hook is used for hooking toeguard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410377974.1A CN105314495B (en) | 2014-08-01 | 2014-08-01 | Lift car bottom safety device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410377974.1A CN105314495B (en) | 2014-08-01 | 2014-08-01 | Lift car bottom safety device |
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| CN105314495A CN105314495A (en) | 2016-02-10 |
| CN105314495B true CN105314495B (en) | 2018-04-10 |
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| CN201410377974.1A Active CN105314495B (en) | 2014-08-01 | 2014-08-01 | Lift car bottom safety device |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109132745B (en) * | 2017-06-27 | 2022-02-18 | 上海三菱电梯有限公司 | Elevator device |
| CN108059063A (en) * | 2017-12-29 | 2018-05-22 | 杭州西奥电梯有限公司 | A kind of foldable toe guard of elevator car |
| EP3530605B1 (en) * | 2018-02-23 | 2021-09-15 | Otis Elevator Company | Elevator car toe guard system |
| CN108382942B (en) * | 2018-04-11 | 2023-09-19 | 浙江速捷电梯有限公司 | Double-deck car elevator |
| CN108584642A (en) * | 2018-05-31 | 2018-09-28 | 浙江梅轮电梯股份有限公司 | A kind of elevator can stretch the toeguard of contraction automatically |
| DE202019101607U1 (en) * | 2019-03-20 | 2020-05-08 | Wittur Holding Gmbh | Elevator for particularly small elevator shafts |
| CN109987559A (en) * | 2019-04-30 | 2019-07-09 | 安徽柳工起重机有限公司 | A kind of protection buffer unit for preventing aerial working platform operation bucket from contacting to earth |
| CN110745674B (en) * | 2019-11-25 | 2024-05-14 | 重庆迈高电梯有限公司 | Safety protection device for overhauling pit of shallow pit elevator |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2237032Y (en) * | 1995-03-25 | 1996-10-09 | 张希贵 | Anti-falling device for carriage |
| US6095288A (en) * | 1999-04-22 | 2000-08-01 | Otis Elevator Company | Pit-less elevator |
| JP4590506B2 (en) * | 2004-05-05 | 2010-12-01 | オーチス エレベータ カンパニー | An elevator equipped with a safety device for protecting an operator in an elevator where the bottom end of the hoistway is low |
| FI118220B (en) * | 2004-06-07 | 2007-08-31 | Kone Corp | Elevator door opening security arrangement |
| EP1817252B1 (en) * | 2004-11-30 | 2009-07-15 | Otis Elevator Company | Elevator car with fold-away shock absorbing legs, and the corresponding elevator |
| CN2766085Y (en) * | 2005-02-17 | 2006-03-22 | 陈根深 | Wall nail |
| CN201058781Y (en) * | 2007-06-01 | 2008-05-14 | 蒂森电梯有限公司 | Elevator shallow pit safety apparatus |
| WO2012137032A1 (en) * | 2011-04-05 | 2012-10-11 | Otis Elevator Company | Toe guard assembly for an elevator system |
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2014
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