Caster Form-Fit Locking With Dual Springs for Low Shifting Force
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Solution Overview
Problem
Existing form-fit locking devices for casters require high shifting forces and are not adaptable to casters with different wheel diameters, and they do not efficiently manage the engagement and disengagement of the rotation blocking mechanism.
Innovation Solution
A form-fit locking device with a first spring acting as a lever arm, where the first spring is stronger than a second spring, allowing the rotation blocking engagement part to engage without resistance in the normal actuation, and a fork-shaped tappet part with varying tappet extensions to accommodate different wheel diameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a conventional form-fit locking device is used, then the rotation blocking engagement part can be engaged with the running wheel, but high shifting forces are required and misalignment may occur
Solution Approach 1:
The locking device employs a spring-loaded rotation blocking engagement part that dynamically adjusts its position. The spring allows the engagement part to move elastically during the engagement process, accommodating alignment variations and reducing the force needed to engage with the running wheel toothing.
Solution Approach 2:
The device changes the operational parameters by using a spring mechanism that provides continuous force adjustment. The spring constant and preload can be optimized to match specific application requirements, allowing the engagement force to adapt to different running wheel configurations and reducing misalignment issues.
2Reliability
If the first spring is made stronger to ensure engagement, then engagement reliability improves, but the return movement becomes difficult
Solution Approach 1:
The spring system is segmented into two distinct springs with different functions: the first spring (stronger) provides the engagement force to push the rotation blocking engagement part into the running wheel, while the second spring (weaker) provides the return force. This segmentation allows each spring to be optimized for its specific purpose without compromise.
Solution Approach 2:
The dual-spring system exhibits asymmetry in force magnitudes - the first spring is deliberately made stronger than the second spring. This asymmetric design ensures that engagement is reliable and positive, while the weaker second spring makes the return movement easier and more controlled, preventing excessive force during disengagement.
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
Reduces shifting forces and allows the same components to be used for casters with varying wheel diameters, ensuring smooth engagement and disengagement of the rotation blocking mechanism with reduced effort.
Implementation Method 1
wherein a first spring acts on the rotation blocking engagement part to displace the rotation blocking engagement part from a starting position into an engagement position
Implementation Method 2
The form-fit locking device incorporates a first spring mounted on a pivotable lever part, which acts as a lever arm to displace the rotation blocking engagement part into the engagement position
Data Source
AI summary
A formfitting securing apparatus for a caster includes a running wheel, a fork and a rotation-blocking engagement part, for rotationally blocking the running wheel of the caster with respect to a geometric impeller wheel axis. A first spring also acts on the rotation-blocking engagement part in order to move it from an initial position into an engagement position. The first spring is formed by a lever arm of a lever part, a second spring can, with the movement of the rotation-blocking engagement part into the engagement position, be tensioned for the return movement back into the initial position, and the first spring is stronger than the second spring. Furthermore, a fork-shaped ram part can have ram extensions of different lengths, with only one ram extension being arranged to act on the lever part.