CA2769542A1 - Enaxial elevator - Google Patents
Enaxial elevator Download PDFInfo
- Publication number
- CA2769542A1 CA2769542A1 CA 2769542 CA2769542A CA2769542A1 CA 2769542 A1 CA2769542 A1 CA 2769542A1 CA 2769542 CA2769542 CA 2769542 CA 2769542 A CA2769542 A CA 2769542A CA 2769542 A1 CA2769542 A1 CA 2769542A1
- Authority
- CA
- Canada
- Prior art keywords
- elevator
- enaxial
- cabin
- pipe
- car frame
- 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.)
- Abandoned
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B9/00—Kinds or types of lifts in, or associated with, buildings or other structures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B11/00—Main component parts of lifts in, or associated with, buildings or other structures
- B66B11/02—Cages, i.e. cars
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B7/00—Other common features of elevators
- B66B7/02—Guideways; Guides
- B66B7/021—Guideways; Guides with a particular position in the shaft
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Automation & Control Theory (AREA)
- Civil Engineering (AREA)
- Mechanical Engineering (AREA)
- Maintenance And Inspection Apparatuses For Elevators (AREA)
Abstract
EnAxial Elevator is an earthquake safe transport solution in which the cabin guide passes through the center of the cabin. This invention is an optimal solution for residential buildings and high traffic commercial buildings, since it provides full panoramic view and a higher than usual passenger capacity and higher speeds. Furthermore, this invention eliminates the need for hallways in a building opening up new possibilities in building architecture.
Description
_CA. 02769.542 2012-02-23 EnAxial Elevator Background of the Invention:
Buildings of different kinds provide a specific area in their architecture as a shared hallway to access an elevator. This is a wasted space can be devoted to other use in a building's architecture. In current standard elevator design, a specific hoistway is dedicated to elevator installation. In the hoistway, at least two walls need to be specifically dedicated to install an elevator rail guides. These two walls are used to secure the elevator's rail guides and in some designs a third wall is used to secure a rail guide for the counterweight.
These walls could also pass on noise caused by vibration to the neighboring units. This limitation with parallel rail guides only allows maximum of two doors on an elevator, since the other two walls need to be dedicated to securing the rail guides. Another limitation caused by parallel rail guides is their prevention of a fully panoramic elevator. As a result of these limitations, higher speeds and more passenger capacity are limited, since increasing these two factors might result in high turbulence and vibration. This high vibration which could result in accidents is caused by inability to install a pair of perfectly parallel rail guides in practice.
Current elevator designs have their counterweights on a separate rail, which under high sheer wind or earthquake can cause the twisting of guides and consequently result in the fall of the counterweight over the cabin. Furthermore, the shape of current cabins prevents a manufacturer to provide a highly aerodynamic efficient cabin.
Summary of the Invention:
The present invention relates to the field of construction, particularly construction of an elevator system that is cost effective, high in speed, voluminous, full panoramic, and earthquake safe. EnAxial Elevator uses a guide pipe as its movement guide in the center of the cabin allowing for a more aerodynamically efficient cabin with reduced vibration and noise. The counterweight in this system moves inside the guide pipe making it an earthquake safe system.
In the drawings which form a part of this specification, Figure 1 shows a perspective plan of EnAxial Elevator; and Figure 2 shows a top view plan of EnAxial Elevator.
Page 1 of 7 Detailed Description of the Invention:
In one embodiment, the present invention provides an earthquake safe elevator system comprising: a) a hollow pipe in a vertical position; b) a cabin attached, through its center, in a sliding fashion to the outside of the pipe; c) a counterweight attached, in a sliding fashion, to the inside of the pipe; wherein the counterweight and the cabin are connected to each other so that as the cabin slides along the outside of the pipe, the counterweight slides in the opposite direction inside of the pipe.
This invention uses a single pipe as its guide. This hollow pipe is attached to the roof of the building and sited at the bottom floor foundation of a building. It passes through the center of the cabin, hence providing symmetrical forces, therefore less vibration. In this invention there are two options for this central pipe, which is used as a guide. One is an actual hollow pipe as shown in Figure 2.1B and the other is a set of beams forming a pipe as shown in 2.1A. In the former case, a circular movement can be caused by the cabin and this is prevented through attaching a U-Shaped DIN 1026-2 UPE80 as shown in Figure 2.16 to the hollow pipe of Figure 1.1 (or Figure 2.1). In order to prevent the circular movement of the cabin two pairs of polymer rollers that are shown in Figure 2.14, are attached to the cabin and will use the attached rail guide (U-Shaped metal) on the main guide pipe for the cabin's non-circular movement.
In contrast to current elevator designs, the counterweight in this invention is located inside the hollow pipe rather than the hoistway. This solution solves two major problems.
The first issue it solves is the danger of having the counterweight dropped on top of the cabin in the case of earthquake -- a major issue in current elevator systems. In this design the counterweight will not have any access to the cabin as it only moves inside the hollow pipe. The second issue it solves is the reduction of air turbulence caused by cabin's high speed movements inside the hoistway. In current technologies the pressure from the counterweight movement along with the opposing pressure from the cabin movement causes a vibration for the cabin as a result of the turbulence. This pressure issue significantly affects the aerodynamics of the system and limits the speed of the cabin. This solution separates the counterweight movement area from the cabin movement area and therefore reduces this turbulent pressure and eliminates the vibration caused by it. The cylindrical counterweight inside of the pipe maintains a smooth movement with two sets of polymer rollers (Figure 2.15) at the top and bottom of the counterweight, shown in Figure 2.4, and they are positioned on opposite sides of it as shown in Figure 2.15. In EnAxial Elevator the safety brakes or parachutes are located underneath the frame as shown in Figure 1.11. EnAxial Elevator can work with a geared or gearless traction machine. Figure 1.5 shows the geared or gearless traction machine, in which its torque is transferred to the two drive sheaves in Figure 1.7 through two engaged gears in Figure 1.6, which are coupled to the traction machine using the axis shown in Figure 1.19.
The two rotating drive sheaves in Figure 1.7 will make the cabin and the counterweight movements possible Page 2 of 7 through the wire ropes in Figure 1.8. The traction machine, opposing gears and drive sheaves are stored in the machine room in the top level of the building.
A cabin in this invention does not necessarily have to be a cylinder, but that is the preferred shape for the cabin as it provides a better aerodynamic efficiency. Having a central axis to move, it allows the cabin to sustain symmetrical forces toward its axis. These two features along with the elimination of the counterweight's air pressure by the movement allow for higher passenger capacity and can significantly increase the elevator's speed.
Also, Magnetic Levitation can help maximizing the speed. In this case, speed maximization is mainly limited to the strength of the car frame and buckling of the main guide pipe. For example to have a passenger capacity of 100 passengers, a main guide pipe with an external diameter of 115cm and thickness of 1.5cm is used as shown in figure 2.1A, or alternatively 20 I-Beam DIN 1025-5 IPE 160 can be used as shown in figure 2.16. The cabin in this estimated example would be 4.5m in diameter and can move up to the critical height of 100m.
Having a single rail guide at the center of the cabin provides one of the best features of this invention. This is the first traction elevator that can provide a full panoramic view without any barriers at sight.
This invention allows for multiple doors across the perimeter of the cabin.
This remarkably space-efficient feature removes the constraint of having a shared hallway specially in the residential and commercial building architecture. The shared hallway can then be used by the architecture for other purposeful uses, rather than a waste of space (e.g., in a residential building each unit can have their own private entry to the elevator cabin). As for the building structure for the elevator installation, each floor (Figure 1.12) should allow the section of the cabin in Figure 1.3 in any desired shape (circular, triangular, etc) to pass through it. Each floor needs to have the same number of doors as the cabin, and provides a glass or metal protector for the whole floor in order to prevent access to the elevator hoistway. With cabin's arrival to each floor all the doors for that level need to be opened at the same time as the cabin's doors in Figure 1.10 to provide access to the cabin. This feature of having multiple doors can also optionally be customized to allow secure private entry to each elevator door.
The cabin and each floor could have central, telescopic (glass, metal, etc) or any other type of doors. The car frame in Figure 1.2 or 2.2, which contains the cabin in Figure 1.3, has a set (usually four) of polymer roller guides on top section of it as shown in Figure 2.13; and another set (usually four) of polymer roller guides at the bottom side of the frame. These two sets of roller guides allow a comfortable movement of the cabin around the pipe in Figures 1.1 and 2.1. As shown in Figure 1.9 and 2.9 another pipe is used within the cabin's internal space. This internal pipe, which is as long as the height of the cabin, prevents access to the central guide pipe, electronic cables for the control panel, and wire ropes which pass through the center of the cabin.
This protected space is also used to connect the upper car frame to the lower car frame as shown in Figure Page 3 of 7 2.18 using a number of metals (usually U-Shaped and as example two of them are used). The upper and lower car frames are also connected using a more secure method that is shown in Figure 2.17, which uses for example four L-Shaped DIN 1028 in four opposite corners of the car frame.
The above embodiments are for illustration and are not meant to limit the invention.
Page 4 of 7
Buildings of different kinds provide a specific area in their architecture as a shared hallway to access an elevator. This is a wasted space can be devoted to other use in a building's architecture. In current standard elevator design, a specific hoistway is dedicated to elevator installation. In the hoistway, at least two walls need to be specifically dedicated to install an elevator rail guides. These two walls are used to secure the elevator's rail guides and in some designs a third wall is used to secure a rail guide for the counterweight.
These walls could also pass on noise caused by vibration to the neighboring units. This limitation with parallel rail guides only allows maximum of two doors on an elevator, since the other two walls need to be dedicated to securing the rail guides. Another limitation caused by parallel rail guides is their prevention of a fully panoramic elevator. As a result of these limitations, higher speeds and more passenger capacity are limited, since increasing these two factors might result in high turbulence and vibration. This high vibration which could result in accidents is caused by inability to install a pair of perfectly parallel rail guides in practice.
Current elevator designs have their counterweights on a separate rail, which under high sheer wind or earthquake can cause the twisting of guides and consequently result in the fall of the counterweight over the cabin. Furthermore, the shape of current cabins prevents a manufacturer to provide a highly aerodynamic efficient cabin.
Summary of the Invention:
The present invention relates to the field of construction, particularly construction of an elevator system that is cost effective, high in speed, voluminous, full panoramic, and earthquake safe. EnAxial Elevator uses a guide pipe as its movement guide in the center of the cabin allowing for a more aerodynamically efficient cabin with reduced vibration and noise. The counterweight in this system moves inside the guide pipe making it an earthquake safe system.
In the drawings which form a part of this specification, Figure 1 shows a perspective plan of EnAxial Elevator; and Figure 2 shows a top view plan of EnAxial Elevator.
Page 1 of 7 Detailed Description of the Invention:
In one embodiment, the present invention provides an earthquake safe elevator system comprising: a) a hollow pipe in a vertical position; b) a cabin attached, through its center, in a sliding fashion to the outside of the pipe; c) a counterweight attached, in a sliding fashion, to the inside of the pipe; wherein the counterweight and the cabin are connected to each other so that as the cabin slides along the outside of the pipe, the counterweight slides in the opposite direction inside of the pipe.
This invention uses a single pipe as its guide. This hollow pipe is attached to the roof of the building and sited at the bottom floor foundation of a building. It passes through the center of the cabin, hence providing symmetrical forces, therefore less vibration. In this invention there are two options for this central pipe, which is used as a guide. One is an actual hollow pipe as shown in Figure 2.1B and the other is a set of beams forming a pipe as shown in 2.1A. In the former case, a circular movement can be caused by the cabin and this is prevented through attaching a U-Shaped DIN 1026-2 UPE80 as shown in Figure 2.16 to the hollow pipe of Figure 1.1 (or Figure 2.1). In order to prevent the circular movement of the cabin two pairs of polymer rollers that are shown in Figure 2.14, are attached to the cabin and will use the attached rail guide (U-Shaped metal) on the main guide pipe for the cabin's non-circular movement.
In contrast to current elevator designs, the counterweight in this invention is located inside the hollow pipe rather than the hoistway. This solution solves two major problems.
The first issue it solves is the danger of having the counterweight dropped on top of the cabin in the case of earthquake -- a major issue in current elevator systems. In this design the counterweight will not have any access to the cabin as it only moves inside the hollow pipe. The second issue it solves is the reduction of air turbulence caused by cabin's high speed movements inside the hoistway. In current technologies the pressure from the counterweight movement along with the opposing pressure from the cabin movement causes a vibration for the cabin as a result of the turbulence. This pressure issue significantly affects the aerodynamics of the system and limits the speed of the cabin. This solution separates the counterweight movement area from the cabin movement area and therefore reduces this turbulent pressure and eliminates the vibration caused by it. The cylindrical counterweight inside of the pipe maintains a smooth movement with two sets of polymer rollers (Figure 2.15) at the top and bottom of the counterweight, shown in Figure 2.4, and they are positioned on opposite sides of it as shown in Figure 2.15. In EnAxial Elevator the safety brakes or parachutes are located underneath the frame as shown in Figure 1.11. EnAxial Elevator can work with a geared or gearless traction machine. Figure 1.5 shows the geared or gearless traction machine, in which its torque is transferred to the two drive sheaves in Figure 1.7 through two engaged gears in Figure 1.6, which are coupled to the traction machine using the axis shown in Figure 1.19.
The two rotating drive sheaves in Figure 1.7 will make the cabin and the counterweight movements possible Page 2 of 7 through the wire ropes in Figure 1.8. The traction machine, opposing gears and drive sheaves are stored in the machine room in the top level of the building.
A cabin in this invention does not necessarily have to be a cylinder, but that is the preferred shape for the cabin as it provides a better aerodynamic efficiency. Having a central axis to move, it allows the cabin to sustain symmetrical forces toward its axis. These two features along with the elimination of the counterweight's air pressure by the movement allow for higher passenger capacity and can significantly increase the elevator's speed.
Also, Magnetic Levitation can help maximizing the speed. In this case, speed maximization is mainly limited to the strength of the car frame and buckling of the main guide pipe. For example to have a passenger capacity of 100 passengers, a main guide pipe with an external diameter of 115cm and thickness of 1.5cm is used as shown in figure 2.1A, or alternatively 20 I-Beam DIN 1025-5 IPE 160 can be used as shown in figure 2.16. The cabin in this estimated example would be 4.5m in diameter and can move up to the critical height of 100m.
Having a single rail guide at the center of the cabin provides one of the best features of this invention. This is the first traction elevator that can provide a full panoramic view without any barriers at sight.
This invention allows for multiple doors across the perimeter of the cabin.
This remarkably space-efficient feature removes the constraint of having a shared hallway specially in the residential and commercial building architecture. The shared hallway can then be used by the architecture for other purposeful uses, rather than a waste of space (e.g., in a residential building each unit can have their own private entry to the elevator cabin). As for the building structure for the elevator installation, each floor (Figure 1.12) should allow the section of the cabin in Figure 1.3 in any desired shape (circular, triangular, etc) to pass through it. Each floor needs to have the same number of doors as the cabin, and provides a glass or metal protector for the whole floor in order to prevent access to the elevator hoistway. With cabin's arrival to each floor all the doors for that level need to be opened at the same time as the cabin's doors in Figure 1.10 to provide access to the cabin. This feature of having multiple doors can also optionally be customized to allow secure private entry to each elevator door.
The cabin and each floor could have central, telescopic (glass, metal, etc) or any other type of doors. The car frame in Figure 1.2 or 2.2, which contains the cabin in Figure 1.3, has a set (usually four) of polymer roller guides on top section of it as shown in Figure 2.13; and another set (usually four) of polymer roller guides at the bottom side of the frame. These two sets of roller guides allow a comfortable movement of the cabin around the pipe in Figures 1.1 and 2.1. As shown in Figure 1.9 and 2.9 another pipe is used within the cabin's internal space. This internal pipe, which is as long as the height of the cabin, prevents access to the central guide pipe, electronic cables for the control panel, and wire ropes which pass through the center of the cabin.
This protected space is also used to connect the upper car frame to the lower car frame as shown in Figure Page 3 of 7 2.18 using a number of metals (usually U-Shaped and as example two of them are used). The upper and lower car frames are also connected using a more secure method that is shown in Figure 2.17, which uses for example four L-Shaped DIN 1028 in four opposite corners of the car frame.
The above embodiments are for illustration and are not meant to limit the invention.
Page 4 of 7
Claims (40)
1) The EnAxial Elevator comprising:
a) A hollow pipe in a vertical position;
b) A cabin attached, through its center, in a sliding fashion to the outside of the pipe in 1a;
c) A counterweight attached, in a sliding fashion, to the inside of the pipe;
wherein the counterweight and the cabin are connected to each other so that as the cabin slides along the outside of the pipe, the counterweight slides in the opposite direction inside of the pipe.
a) A hollow pipe in a vertical position;
b) A cabin attached, through its center, in a sliding fashion to the outside of the pipe in 1a;
c) A counterweight attached, in a sliding fashion, to the inside of the pipe;
wherein the counterweight and the cabin are connected to each other so that as the cabin slides along the outside of the pipe, the counterweight slides in the opposite direction inside of the pipe.
2) The EnAxial Elevator of claim 1, wherein pipe is connected only from the top to the roof or last story of a structure and from the bottom is structured and sited on the floor of a foundation structure such as a building.
3) The EnAxial Elevator of claim 2, wherein the support structure is a hollow cylindrical pipe or optionally a pipe comprised of for example 20 T-Shaped DIN 1025-5 IPE
160.
160.
4) The EnAxial Elevator of claim 2, wherein the support structure is a pipe.
5) The EnAxial Elevator of claim 2, wherein the support structure is an alloy fabricated as one piece for purpose of supporting an elevator system inside.
6) The EnAxial Elevator of claim 1, wherein 1 pipe per cabin is used, with the pipe containing a counterweight.
7) The EnAxial Elevator of claim 1, wherein the elevator cabin is optionally cylindrical or any other desired shape.
8) The EnAxial Elevator of claim 1, wherein the elevator cabin's aerodynamical and symmetrical shape allows for higher and lower speeds than 18 m/s.
9) The EnAxial Elevator of claim 1, wherein the elevator cabin's symmetrical shape significantly minimizes cabin vibration as a result of its symmetrical forces toward the axis, which is the hollow pipe.
10) The EnAxial Elevator of claim 1, wherein the elevator cabin's symmetrical shape with symmetrical forces toward the axis allows for capacities higher and lower than persons, which is the world record for an elevator's capacity at the time of this patent application submission.
11) The EnAxial Elevator of claim 1, where in a car frame (yolk) is used to hold the cabin of claim 1b.
12) The EnAxial Elevator of claim 11, wherein the car frame has an upper part.
13) The EnAxial Elevator of claim 11, wherein the car frame has a lower part.
14) The EnAxial Elevator of claim 1, wherein two drive sheaves or pulleys are used to connect the counterweight with the cabin through a wire rope.
15) The EnAxial Elevator of claim 14, wherein the two drive sheaves or pulleys which connect the counterweight with the cabin are connected to two engaged gears, which are consequently connected to a traction machine.
16) The EnAxial Elevator of claim 1, wherein polymer rollers are used for having the cabin slide vertically around the guide pipe of claim 1a.
17) The EnAxial Elevator of claim 16, wherein a set of polymer rollers (usually four) on top of the cabin attached to the upper car frame (claim 12) and a set of polymer rollers (usually four) at the bottom attached to the lower car frame (claim 13), so as to surround the pipe on all sides.
18) The EnAxial Elevator claim 17, wherein a set of polymer rollers (usually four) on top of the cabin are attached to the upper car frame.
19) The EnAxial Elevator claim 17, wherein a set of polymer rollers (usually four) on bottom of the cabin are attached to the lower car frame.
20) The EnAxial Elevator of claim 16, wherein the guide pipe of la is passed through the center of the cabin to allow for positioning of the polymer rollers on all sides of the pipe.
21) The EnAxial Elevator of claim 1, wherein the counterweight has two sets of polymer rollers which slide against inside of the guide pipe of la as per counterweight's movement inside the guide pipe.
22) The EnAxial Elevator of claim 21, wherein a set of polymer rollers are installed around the top part of the cylindrical counterweight(s).
23) The EnAxial Elevator of claim 21, wherein a set of polymer rollers are installed around the bottom part of the cylindrical counterweight(s).
24) The EnAxial Elevator of claim 1, wherein the elevator hallway of the building or the structure that the EnAxial Elevator is installed on has the option to be eliminated. This change in building architecture by the design of claim 1 results in more choice for the architect to design a building and does not restrict the architect to a hallway that needs to be used by all the units in a floor of a building.
25) The EnAxial Elevator of claim 1, wherein any attachment of supporters such as T-Shaped rail guides is eliminated from the outside of the cabin, hence allowing a full panoramic elevator with a full panoramic view.
26) The EnAxial Elevator of claim 1, wherein the elevator system can use a Magnetic Levitation technology to decrease friction between the polymer rollers in claim 12.
27) The EnAxial Elevator of claim 1, wherein the counterweight's movement is isolated from the cabin movement, hence significantly reducing wind or air sheer pressure and turbulence in the hoistway.
28) The EnAxial Elevator of claim 1, wherein the counterweight which its movement is isolated from the cabin movement eliminates the danger of having the counterweight dropped on top of the cabin in accidents or special circumstances such as an earthquake, making the EnAxial Elevator an earthquake safe system.
29) The EnAxial Elevator of claim 1, wherein the cabin can have as many doors as possible limited to the perimeter of the cabin.
30) The EnAxial Elevator of claim 1, wherein a cover is embedded inside the cabin at the center to prevent access to the guide pipe of claim 1a, electronic cables for the control panel, and wire ropes.
31) The EnAxial Elevator of claim 30, wherein the space between the cover and guide pipe of claim 1a is used to connect upper car frame to the lower car frame.
32) The EnAxial Elevator of claim 1, wherein its upper car frame and lower car frame are connected using a metal for example L-Shaped DIN 1028 in four or more opposite corners of the car frame.
33) The EnAxial Elevator of claim 32, where the metal is connecting the upper car frame to the lower car frame on the four or more opposite corners of the cabin.
34) The EnAxial Elevator of claim 1, wherein a U-Shaped metal is attached to the guide pipe of claim la for prevention of cabin's rotational movement.
35) The EnAxial Elevator of claim 34, wherein the car frame has two pairs of polymer rollers, which are used to prevent cabin's circular movement by sliding against the metal of claim 34.
36) The EnAxial Elevator of claim 35, wherein a pair of polymer pulleys is attached to the top car frame which contains the cabin.
37) The EnAxial Elevator of claim 35, wherein a pair of polymer pulleys is attached to the lower car frame which contains the cabin.
38) The EnAxial Elevator of claim 1, wherein the cabin doors can be of any type such as central or telescopic.
39) The EnAxial Elevator of claim 1, wherein emergency brakes (parachute) are used for emergency purposes such as sudden stop of the cabin.
40) The EnAxial Elevator of claim 39, wherein the emergency brakes are installed under the car frame that contains the cabin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2769542 CA2769542A1 (en) | 2012-02-23 | 2012-02-23 | Enaxial elevator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2769542 CA2769542A1 (en) | 2012-02-23 | 2012-02-23 | Enaxial elevator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2769542A1 true CA2769542A1 (en) | 2013-08-23 |
Family
ID=49000697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2769542 Abandoned CA2769542A1 (en) | 2012-02-23 | 2012-02-23 | Enaxial elevator |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2769542A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220048737A1 (en) * | 2020-08-12 | 2022-02-17 | Otis Elevator Company | Elevator system and supporting column assembly thereof |
-
2012
- 2012-02-23 CA CA 2769542 patent/CA2769542A1/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220048737A1 (en) * | 2020-08-12 | 2022-02-17 | Otis Elevator Company | Elevator system and supporting column assembly thereof |
| US11673774B2 (en) * | 2020-08-12 | 2023-06-13 | Otis Elevator Company | Elevator system and supporting column assembly thereof |
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