Elevator Car Removable Side Wall Maintenance Window
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Solution Overview
Problem
Existing lift cabin maintenance solutions do not allow for complete accessibility of all maintenance elements from within the cabin, particularly the guide rails and cable guides, which are often located outside the accessible range, making it difficult to verify and maintain these components safely and efficiently.
Innovation Solution
A lift cabin design featuring a removable side wall section that can be lowered to the cabin floor, forming a parapet and creating a maintenance window, allowing access to all necessary elements while ensuring a minimum 10cm distance from moving parts, enabling comprehensive maintenance from within the cabin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cabin side wall is made completely fixed and enclosed, then the cabin structure is more stable and secure, but maintenance personnel cannot access all maintenance elements (guide rails, cable guides) from within the cabin
Solution Approach 1:
The cabin side wall is divided into a removable upper section and a fixed lower section. The upper section can be completely removed to create an open maintenance window, allowing full access to guide rails and cable guides. This segmentation enables maintenance personnel to access all maintenance elements from within the cabin while maintaining structural integrity through the remaining lower wall section and parapet.
Solution Approach 2:
The cabin side wall transitions from a static fixed structure to a dynamic configurable structure. The removable upper wall section allows the maintenance opening to be created when needed and closed when not in use, providing flexibility for both maintenance operations and normal operation safety.
2Ease of operation
If the maintenance window is opened to access all elements, then complete maintenance accessibility is achieved, but safety risks increase due to exposure to moving parts
Solution Approach 1:
A removable parapet is introduced as an intermediary safety barrier between the maintenance personnel and the moving parts in the lift shaft. The parapet can be positioned to provide the required 10cm safety distance while still allowing access to maintenance elements. Distance holders ensure the parapet maintains the correct positioning to prevent accidental contact with moving parts.
Solution Approach 2:
The parapet and distance holders are prepared and positioned before maintenance work begins. The safety barrier is established in advance to ensure personnel protection is in place before they expose themselves to the hazardous environment of the open maintenance window.
3Reliability
If a fixed parapet is provided at the cabin roof, then safety distance of 10cm from moving parts is ensured, but maintenance personnel cannot reach elements requiring closer access
Solution Approach 1:
The parapet is segmented into a removable section that can be completely taken away when close access is required. This allows maintenance personnel to work at the optimal distance from moving parts while the remaining fixed parapet structure continues to provide safety for areas where close access is not needed.
Solution Approach 2:
The parapet structure has different properties in different locations: the upper section is removable to allow close access where needed, while the lower section remains fixed to maintain safety distance where required. This local differentiation of parapet properties optimizes both safety and accessibility.
4Reliability
If maintenance is performed from outside the cabin using ladders and work podiums, then safety distance is maintained, but maintenance time and complexity increase significantly
Solution Approach 1:
The cabin wall is segmented to create a large open maintenance window that allows maintenance personnel to work directly from within the cabin. This eliminates the need for external ladders and work podiums, significantly reducing maintenance time while maintaining safety through the retained lower wall section and removable parapet.
Solution Approach 2:
The upper wall section is extracted or removed to create the maintenance opening. This extraction provides direct access to all maintenance elements from within the cabin, eliminating the need for external access structures and reducing maintenance complexity.
Data Source
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AI summary
The invention relates to an elevator car which is suitable for elevators in which all of the elements which are to be maintained and checked are arranged outside the elevator car, opposite only one side of the elevator car. Said elevator car comprises, on said side, one part (3) that is arranged more than 85cm above the elevator base (1) on the elevator wall (2) and that can be removed from inside the elevator. Said part (3) is as least 95cm high and, after being removed, can rest vertically on the base of the elevator (1), against said elevator wall (2), in order to form a balustrade (4). At least one spacer (5) is arranged between said removable part (3) and the lower part (6) of the elevator wall (2) so that the distance from the inner side of the side wall part (3) that is placed on the base (1), facing the elevator, to the elements (7, 8) of the elevator drive moving past the travelling lift car is at least 10cm.