Locking Caster with Self-Orienting Mechanism
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Solution Overview
Problem
Current swivel casters require precise orientation before locking, making straight-line movement and corner turning difficult, especially in hospital beds, and existing solutions that use non-swivelable wheels for lateral resistance are not always effective or convenient.
Innovation Solution
A swivelable caster design incorporating a centering element, locking element, and biasing element that allows the caster to pivotally urge and lock into a specific orientation, enabling locking mechanism engagement from any orientation and reducing the need for precise alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking mechanism is designed to require precise caster orientation before engagement, then the locking reliability is improved, but the ease of operation deteriorates
Solution Approach 1:
The caster is automatically oriented to the locked position through the interaction of the cam surface and locking lever before the locking mechanism is engaged. This preliminary automatic orientation eliminates the need for manual alignment by the user, allowing the locking mechanism to be engaged from any initial caster orientation while ensuring reliable locking at the correct position.
2Adaptability or versatility
If swivelable casters are used to allow movement in multiple directions, then the adaptability is improved, but the control during straight-line movement deteriorates
Solution Approach 1:
The caster design allows dynamic switching between swivelable and locked states. During normal operation, the caster remains swivelable to accommodate multi-directional movement needs. When straight-line control is required, the locking mechanism can be engaged to fix the caster at a predetermined orientation, providing on-demand stabilization without sacrificing overall versatility.
3Productivity
If the locking mechanism is engaged while the caster is in motion, then the productivity is improved, but the reliability deteriorates
Solution Approach 1:
The cam surface and locking lever arrangement enables the locking mechanism to automatically orient and secure the caster during motion. The mechanical interaction between the cam surface and locking lever self-adjusts to the correct locked position regardless of the approach angle or speed, eliminating the need for precise manual alignment and allowing reliable locking even when engaged while the caster is moving.
Data Source
AI summary
A lockable swivelable caster provides for an interaction between a centering element and a locking element to pivotally urge the locking element into a locking notch of the centering element such that the locking element is captured by the locking notch to prevent swiveling of the caster wheel.