Elevator Cable Guide with Service Platform
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Solution Overview
Problem
Conventional lift drive systems require high headroom and shaft space, posing safety risks during maintenance and compromising design aesthetics, while also suffering from suboptimal mass balance and space utilization between the lift car and shaft.
Innovation Solution
A cable guide system where at least two cables are mounted on a mounting bridge over vertical guide rails, with ropes supporting the counterweight and lift car using parallel horizontal axles and loose rollers, allowing maintenance from within the lift cabin and minimizing space and forces on the shaft wall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the drive unit is arranged laterally in an upper area of the shaft space, then the headroom height and shaft space cross-section are minimized, but maintenance work becomes dangerous as mechanics must climb onto the cab roof
Solution Approach 1:
A service platform is introduced as an intermediary structure between the drive unit and the lift cabin roof. This platform provides safe access for maintenance personnel to reach the drive unit without climbing onto the cabin roof, thereby eliminating the crushing risk while maintaining compact shaft space dimensions.
2Reliability
If a mandatory protective area is provided above the cabin, then safety is improved, but the headroom height increases to accommodate the protective space
Solution Approach 1:
The service platform extends laterally into the shaft space, utilizing the horizontal dimension rather than increasing vertical headroom height. This allows the protective function to be achieved while maintaining minimal headroom dimensions required for the lift cabin operation.
3Device complexity
If cable guides take up space between the cabin and shaft wall, then the drive system is simpler, but the space utilization between lift car and shaft is suboptimal
Solution Approach 1:
The cable guide function is merged with the service platform structure. The cables are routed through and attached to the service platform, combining two functions (cable guidance and maintenance access) into a single integrated structure, thereby optimizing space utilization without increasing drive system complexity.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
An elevator car and the counterweight (30) are each guided on a pair of vertical guide rails disposed along a shaft wall. At least two cables (41, 42) are guided in the upper part about a traction cylinder (26) mounted on a mounting bridge on the guide rails. The rotational axle of the cylinder drive is parallel to the adjacent shaft wall. The cables (41) guided in the lower area and arranged on the side of the shaft wall support the counterweight (30) such that half of the cables (41) comprise, on the lower side, one of the cable pulleys (29) acting as free rollers and the other half of the cables (41) comprise on the lower side thereof the other two cable pulleys (29). The axle pins (11) of said cable pulleys (29) extend horizontally, adjacently and parallel in relation to each other and support the counter-weight (30). The axle pins (11) of said cable pulleys (29) are also perpendicular to the axle of the drive cylinder (26). Said cables (41) on the other side of said cable pulleys (29) travel in an upward direction to the mounting bridge and are secured there. The at least two other cables (42) travelling from the traction cylinder (26) in a downward direction support the elevator car. One half of said cables (42) support one of the two cable pulleys (28) and the other half support the other cable pulleys (28).