Pulley Assembly Bollard Geometry for Anti-Pivot Rope Alignment
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Solution Overview
Problem
Conventional pulley assemblies used in rope systems for lifting and transporting loads often experience uncontrolled alignment and pivoting, leading to inefficiencies and reduced precision in managing rope tension and control lines, especially when installed at heights or in remote locations.
Innovation Solution
A pulley assembly design featuring plates with sheaves and a bollard that is longer radially than perpendicular to the sheave axis, inhibiting pivoting and enhancing alignment, along with a cross-hole for secondary anchoring, allows for improved control and stability of rope systems by securing the assembly to a fixed anchor and reducing the tendency to pivot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a conventional pulley assembly is used with a standard bollard, then the assembly can be secured to an anchor, but the assembly tends to pivot uncontrollably about the bollard
Solution Approach 1:
The bollard is designed with an asymmetric cross-sectional shape where the dimension along the major dimension line (radially from sheave axis) is greater than the dimension perpendicular to it. This asymmetric geometry creates different moments of inertia about different axes, with the major dimension providing greater resistance to pivoting. The asymmetric shape inherently stabilizes the pulley assembly alignment while maintaining ease of operation by preventing uncontrolled rotation.
2Stability of the object's composition
If the bollard dimension along the major dimension line is increased to inhibit pivoting, then alignment stability improves, but the device complexity increases
Solution Approach 1:
The bollard incorporates a localized geometric feature where only the cross-sectional dimensions are asymmetric, while the overall bollard structure remains simple and straightforward. The asymmetric cross-section is a localized modification that provides enhanced pivoting resistance without requiring complex overall bollard geometry. This localized quality change achieves improved stability while minimizing increases in device complexity.
Data Source
AI summary
A pulley assembly and an installation for moving objects incorporating such a pulley assembly are disclosed. The pulley includes first and second plates disposed about a median plane. One or more sheaves are disposed between the plates. The or each sheave is carried for rotation about a respective sheave axis that is perpendicular to the median plane. A bollard extends between the plates to provides an interconnection between the plates. The bollard is shaped, whereby its dimension in a direction along a major dimension line, which dimension line that extends radially from one of the sheave axes, is greater than its dimension in a direction perpendicular to that dimension line.