Spring-Loaded Tensioning Device for Elevator Overspeed Governor Rope
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Solution Overview
Problem
Conventional tensioning devices for overspeed governor ropes in elevators, such as weight-loaded devices, tend to oscillate and are expensive, while spring-loaded devices lack precision and adjustability, leading to potential slippage and overloading issues due to temperature variations and long rope lengths.
Innovation Solution
A spring-loaded tensioning device with guide columns and a carriage system that provides precise and redundant tensioning, using helical compression springs and a C-shaped bracket for robust guidance, allowing for adjustable pretensioning and minimal width, suitable for compact elevator designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If weight-loaded tensioning devices are used, then constant tension is achieved, but oscillation occurs and cost increases
Solution Approach 1:
The patent replaces the weight-loaded mechanical tensioning system with a spring-loaded tensioning device. The spring element (14) provides the tensioning force, eliminating the need for heavy weights and their associated guidance mechanisms. This substitution maintains constant tension while eliminating the oscillation problem inherent in weight-loaded systems.
2Object-generated harmful factors
If spring-loaded tensioning devices are used, then oscillation is eliminated, but guidance precision and adjustability are insufficient
Solution Approach 1:
The patent extracts the guidance function from the tensioning mechanism itself and implements it separately through guide columns (2). The guide columns provide precise vertical guidance for the carriage, while the spring element provides tensioning. This separation allows each component to be optimized independently, achieving both precision guidance and smooth tensioning without oscillation.
Solution Approach 2:
The patent introduces a carriage as an intermediary component between the spring element and the deflection pulley. The carriage carries the deflection pulley and travels along the guide columns, mediating between the spring's tensioning force and the pulley's positioning requirements. This intermediary enables precise guidance through the guide columns while maintaining the spring's ability to provide constant tension.
3Object-generated harmful factors
If spring-loaded tensioning devices are used, then oscillation is eliminated, but pretensioning adjustability is insufficient
Solution Approach 1:
The patent makes the tensioning system dynamically adjustable by allowing the carriage to move along the guide columns and by providing an adjustable spring travel limiter (15). The spring travel limiter can be positioned at different heights to adjust the pretensioning force, and the carriage can be repositioned along the guide columns to accommodate different rope lengths or tension requirements. This dynamic adjustability replaces the fixed nature of weight-loaded systems.
4Area of stationary object
If a compact tensioning device is designed, then shaft cross-section is optimized, but guidance precision may be compromised
Solution Approach 1:
The patent resolves the space precision contradiction by transitioning to a vertical arrangement. The guide columns are positioned vertically within the compact shaft cross-section, and the carriage travels along these vertical guides. This vertical dimensionality allows for precise guidance in a limited horizontal footprint, optimizing the shaft cross-section while maintaining guidance precision through the vertical guide column-carriage interface.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures precise and permanent guidance of the deflection pulley, preventing slippage and overloading, while maintaining a compact design that optimizes the elevator shaft cross-section, even in machine roomless configurations, and allows for easy spring replacement and tension adjustment.
Implementation Method 1
at least one spring element (14) is threaded onto each guide column (2)... The tension of the spring elements (14) thus acts on the lower yoke (5) of the carriage and pulls it downward
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A tensioning device (1) for an overspeed governor rope of an elevator with a spring tension mechanism for tensioning a deflection pulley (8) for the overspeed governor rope, wherein the spring tension mechanism is composed of at least two guide columns (2) onto each of which a respective spring element (14) is threaded and which are secured by a main frame (3a, 3a, 3b, 3b) in such a way that their first guide column section (2a) lies entirely within the region encompassed by the main frame (3a, 3b) and their second guide column section (2b) is situated above the main frame (3a, 3b) outside the region encompassed by it, and of a carriage (4a, 4b, 5, 6) with a deflection pulley (8) mounted on it in rotatable fashion, which carriage is supported in sliding fashion on the guide columns (2) by means of two yokes (5, 6); the lower yoke (5) of the slider travels on the first guide column section (2a) and constitutes an abutment for the spring elements (14), which are supported at their other end against the upper horizontal section (3a) of the main frame (3a, 3b); and the upper yoke (6) of the carriage (4a, 4b, 5, 6) travels on the second guide column section (2b) and preferably comes to a stop against an adjustable spring travel limiter (15).