Caster Swivel Lock Using Interlocking Spline Mechanism
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Solution Overview
Problem
Existing swivel locks for casters lack an efficient mechanism to prevent rotation while allowing for easy unlocking, leading to instability and potential accidents.
Innovation Solution
A swivel lock mechanism utilizing a male spline shaft and female spline bushing that interlock to prevent rotation, actuated by a brake lever, allowing for secure locking and easy unlocking through a combination of pivoted levers and spring-loaded mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple lock mechanism is used, then the device complexity is reduced, but the reliability of preventing rotation deteriorates
Solution Approach 1:
The lock mechanism is segmented into distinct functional components: a brake lever for actuation, a lock block for engagement, and a spline shaft with splined bore for mechanical interlocking. This segmentation allows each component to perform its specific function efficiently while maintaining overall system reliability without excessive complexity.
Solution Approach 2:
The lock block is nested within the brake lever structure, and the spline shaft is inserted through the lock block and brake lever assembly. This nesting arrangement compactly integrates multiple locking functions into a single cohesive mechanism, improving reliability through coordinated action of nested components while controlling device complexity.
2Stability of the object's composition
If a secure locking mechanism is implemented, then the stability is improved, but the ease of operation deteriorates
Solution Approach 1:
The brake lever is designed as a dynamic component that can pivot between locked and unlocked positions. The spring-loaded mechanism provides dynamic force to automatically engage the lock block with the spline shaft, ensuring stable locking without requiring manual intervention for engagement, thus maintaining ease of operation.
Solution Approach 2:
The spring-loaded mechanism automatically engages the lock block with the spline shaft when the brake lever is actuated, and automatically disengages when the lever is released. This self-service feature ensures reliable locking and unlocking without requiring precise manual timing or force, improving both stability and ease of operation.
3Ease of operation
If a complex spring-loaded mechanism is used, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The spring-loaded mechanism is merged with the brake lever and lock block assembly, where the spring serves multiple functions: providing locking force, enabling automatic engagement, and facilitating easy release. This merging of functions into a single integrated mechanism improves ease of operation while controlling overall device complexity.
Solution Approach 2:
The brake lever serves multiple functions: it acts as the actuation lever for locking, provides the structural framework for the lock block, and works in conjunction with the spring to enable automatic engagement and release. This multi-functionality reduces the need for separate components, improving ease of operation without proportionally increasing complexity.
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 mechanism effectively prevents rotation of the caster's wheels when locked, ensuring stability and allowing for easy rotation when unlocked, enhancing safety and usability.
Implementation Method 1
spring-loaded mechanisms
Implementation Method 2
actuated by a brake lever
Data Source
AI summary
A caster comprises a body including a stem cavity with a stem of the caster rotatably mounted in the stem cavity to permit rotation of the stem relative to the body about a stem access. The stem may comprise a spline shaft extending from the stem into the stem cavity. The stem and spline shaft are operatively connected. The stem cavity may have a spline bushing. The spline bushing and the body are operatively connected to each other. The spline shaft and the spline bushing are releasbeably interlockable. One of the spline bushing and the spline shaft may be movable in a direction along the stem axis between the swivel position wherein the spline shaft is not engaged with the spline bushing, and a fixed position wherein the spline shaft is engaged with the spline bushing.