Elevator Governor Cable Tensioner with Adjustable Mass
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Solution Overview
Problem
Existing speed limiter cable tensioners for elevators face misalignment issues with round guides and interference with lift car stirrups due to fixed mass limitations, particularly when the load exceeds 26 kg, limiting adaptability and causing operational inefficiencies.
Innovation Solution
A speed limiter cable tensioner with a fixed part anchored to the ground and a movable part carrying a pulley, featuring a C-section vertical rail and adjustable heavy metal plates, allowing for mass adaptation and compact design to avoid interference, along with a safety ramp for actuating a safety contact in case of cable failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the load is increased to ensure adequate cable tensioning force, then the cable tensioning reliability is improved, but the height of the tensioner envelope increases causing interference with the lift car stirrup
Solution Approach 1:
The invention transitions from a vertical stacking arrangement (where mass is achieved by stacking plates vertically) to a horizontal arrangement where the C-section rail provides lateral support. This allows the load to be distributed horizontally along the rail rather than vertically, reducing the envelope height while maintaining the required tensioning force through the horizontal configuration of the armature and rail system.
2Volume of moving object
If the tensioner is made compact to avoid interference with lift car stirrup, then the space utilization is improved, but the mass adjustment capability is reduced
Solution Approach 1:
The armature is segmented into a modular structure with a C-section rail that can accommodate adjustable mass distribution. The rail itself is divided into sections that can be configured to hold different amounts of mass at different positions, allowing mass adjustment while maintaining a compact overall envelope. The segmented design enables flexibility in mass configuration without increasing the external dimensions.
Solution Approach 2:
The mass adjustment mechanism is nested within the C-section rail structure. The rail contains internal or integrated mass elements that can be repositioned or adjusted within the confined space of the rail, rather than requiring external additions. This nested arrangement allows mass adjustment capability to be incorporated within the compact envelope without requiring additional external space.
3Device complexity
If a fixed mass design is used to simplify the structure, then the device complexity is reduced, but the adaptability to different elevator installations is worsened
Solution Approach 1:
The invention employs a dynamic mass adjustment mechanism where the mass distribution can be changed based on installation requirements. The C-section rail is designed to accommodate variable mass configurations, allowing the tensioner to be adapted to different elevator installations by adjusting the mass position or quantity within the rail, rather than requiring a completely different fixed-mass design for each application.
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 reliable cable tensioning without misalignment or interference, allows for mass adjustment based on installation needs, and provides a compact, efficient design that prevents elevator operation when the cable is slack or broken, ensuring safety and operational integrity.
Implementation Method 1
an armature (5) with a horizontal C-section in which are stacked plates (6) of heavy metal constituting the adjustable mass of the cable tensioner
Implementation Method 2
rollers which slide in the rail (4) at C of the fixed part (1)
Data Source
Figure 1~3
Figure 4
AI summary
The device has a fixed part comprising a base (3) fixed to a floor in bottom of a lift shaft. A mobile part carries a pulley (7) in which an overspeed governor cable passes. The mobile part comprises rollers sliding in a C-shaped section of a vertical rail (4) of the fixed part. Plates (6) are stacked in a frame (5) of the mobile part, and are removable for adjusting the mass of the device. The mobile part has a vertical dimension equal to nominal diameter of the pulley, which is increased by 41 mm.