Elevator Car Under-Car Pulley Structure for Floor Inclination Control
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Solution Overview
Problem
The protrusion of a tie rod beyond the car outside measurement in an elevator car restricts the arrangement and design of hoistway devices, necessitating interference checks and structural reviews during installation.
Innovation Solution
An elevator car design that suppresses car floor inclination using a car frame with vertical frames, floor support beams, under-car pulleys, pulley support members, and linking members to transfer upward forces from the main rope to the vertical frames, eliminating the need for a tie rod.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a tie rod is used to suppress car floor inclination, then the car floor stability is improved, but the tie rod protrudes beyond the car outside measurement and restricts the arrangement of hoistway devices
Solution Approach 1:
The invention extracts the inclination suppression function from the protruding tie rod and relocates it to the under-car pulley system. The under-car pulley, positioned within the car outside measurement, provides the same structural stabilization function without encroaching on hoistway device installation space.
Solution Approach 2:
The invention changes the spatial arrangement by moving the inclination suppression mechanism from a lateral protrusion (tie rod extending outward) to an under-car positioning system (under-car pulley below the car floor). This dimensional shift allows the same function to be achieved within the existing car envelope, eliminating interference with hoistway devices.
2Stability of the object's composition
If a tie rod protrudes beyond the car outside measurement is used, then the car floor inclination is suppressed, but installation complexity increases due to interference checks and structural reviews
Solution Approach 1:
The invention removes the problematic protruding tie rod from the system and extracts its essential function (inclination suppression) to the under-car pulley assembly. This elimination of the protruding element simplifies installation by removing the need for interference checks and structural reviews between the tie rod and hoistway devices.
3Strength
If the car floor inclination is suppressed using traditional tie rod structure, then structural stability is achieved, but the structure occupies more space and reduces design flexibility
Solution Approach 1:
The invention relocates the structural stabilization function from a horizontal protrusion (tie rod extending laterally) to a vertical under-car arrangement (under-car pulley below the car floor). This dimensional repositioning maintains structural stability while confining the mechanism within the existing car envelope, reducing space occupation and improving design flexibility.
Data Source
AI summary
This elevator car includes: a car frame having a pair of vertical frames and a lower frame linking lower ends of the pair of vertical frames; a floor support beam supporting a car floor and supported on the lower frame; an under-car pulley disposed below the car floor; a pulley support member fixed to the floor support beam and rotatably supporting the under-car pulley; and a linking member linking the vertical frames and the floor support beam. The elevator car has a structure in which an upward force exerted on the pulley support member and the floor support beam by a main rope that is wound around the under-car pulley is received by the linking member and the vertical frames.