Elevator Car Pulley Axle Pivoting for Maintenance Access
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Solution Overview
Problem
The existing suspension elevator systems require significant assembly and disassembly effort due to the complex positioning and access constraints of car pulleys, which are often obstructed by other components, leading to time-consuming replacement processes.
Innovation Solution
The suspension elevator design features car pulleys mounted on a common axle between open-sided C-section beams, allowing the axle to be pivoted or translated out of its seat for easy removal, enabling pulleys to be pulled out along their central axis, reducing the need for separate axles and minimizing assembly effort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If car pulleys are mounted on the underside of the car beam with downward access, then the pulleys can be positioned close to the guide rail for optimal load distribution, but access to the pulleys is blocked by other components such as braking or safety gear assemblies
Solution Approach 1:
The patent inverts the conventional mounting approach by positioning the car pulleys on the upper side of the car beam instead of the underside. This inversion allows access from above without obstruction from braking or safety gear assemblies, while still maintaining optimal positioning near the guide rail through the use of upper and lower suspension means arranged symmetrically.
2Ease of operation
If car pulleys are mounted on the upper side of the car beam, then access for maintenance is improved, but space is limited in the upper area of the elevator shaft
Solution Approach 1:
The patent utilizes the vertical dimension by arranging suspension means both above and below the guide rail. The upper suspension means are positioned above the guide rail while lower suspension means are positioned below it, allowing pulleys to be mounted on the upper side of the beam for improved access while maintaining balanced load distribution and avoiding space conflicts in the upper shaft area.
3Reliability
If multiple suspension means are used to optimize load introduction, then weight distribution is improved, but the position of car pulleys is constrained by the need to maintain symmetry with respect to the guide rail
Solution Approach 1:
The patent employs asymmetric positioning of suspension means relative to the car beam structure. Upper suspension means are arranged above the guide rail and lower suspension means below it, creating an asymmetric configuration that nevertheless achieves symmetric load distribution. This allows pulleys to be mounted on the upper side for improved access while maintaining reliable load introduction through the balanced arrangement.
Data Source
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AI summary
Suspension elevator with a car suspended in a pulley block on a usually multi-part, flexible suspension means, as well as a drive for moving the suspension means and several car pulleys rotatably held on a common axle between two car beams, which are preferably open-sided, for example in the form of C-profile beams, which form a car pulley unit over which the suspension means runs, wherein the common axle is mounted in at least one seat of the car beams in such a manner that it can be brought out of engagement with the seat or seat area by a pivoting or purely translatory displacement transversely to its central longitudinal axis, and that the at least one car beam is designed and adapted to the car pulley unit in such a way that the car pulley unit, after being disengaged from the at least one seat or seat area, can be pulled out of its installation space between the car beams by a movement extending at least substantially in the direction of its central longitudinal axis through one of the car beams.