Snap-Fit Connection with Movable Stop for Easy Detachment
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Solution Overview
Problem
Snap-fit connections face challenges in achieving high holding forces while maintaining low detachment forces, often risking damage to the locking element during detachment due to high detachment forces required.
Innovation Solution
A connection arrangement with a movable stop that transitions between operative and detachment positions, allowing the locking element to deform unhindered and reduce detachment forces, while maintaining high holding forces through a deformable locking element and actuating device like thrust bolts or threaded bolts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the locking element is designed to provide high holding forces, then the connection strength between assemblies is improved, but the detachment forces required become excessively high and may damage the locking element
Solution Approach 1:
The stop is designed to be movable between a first position (during mounting) and a second position (during detachment), allowing the system to dynamically adapt its constraints. In the first position, the stop limits locking element deformation to create high holding forces. In the second position, the stop is moved away to allow full deformation for easy detachment without damage.
Solution Approach 2:
The system changes the deformation parameters of the locking element based on the stop's position. When the stop is in the first position, the locking element deforms to a first degree creating an undercut for high holding forces. When the stop moves to the second position, the locking element can deform to a greater degree, reducing the forces needed for detachment.
2Ease of operation
If the locking element deforms significantly to enable detachment, then the detachment force is reduced, but the holding force during operation is compromised
Solution Approach 1:
The movable stop enables dynamic control of the locking element's deformation state. During operation, the stop is in the first position, limiting deformation and maintaining high holding forces. During detachment, the stop moves to the second position, allowing significant deformation and easy release, thus providing both strong holding and easy detachment.
Solution Approach 2:
Before detachment occurs, the stop is moved to the second position in advance, preparing the locking element to deform freely. This preliminary action ensures that when detachment force is applied, the locking element can deform to the required degree without resistance, making detachment easy while maintaining full holding force during normal operation.
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
Enables high holding forces combined with low detachment forces, ensuring the locking element remains intact during detachment and simplifying the handling of the connection arrangement.
Implementation Method 1
an elastically deformable locking element being disposed on the first assembly, which locking element serves to releasably interlock the first assembly and the second assembly and, during mounting of the two assemblies, deforms into a mounting condition
Implementation Method 2
in which the locking element bears against the stop and/or in which the locking element is deformable against the stop
Data Source
AI summary
A connection arrangement includes a first and a second assembly, and an elastically deformable locking element disposed on the first assembly. The locking element is configured to releasably interlock the two assemblies and, during mounting of the two assemblies, to deform into a mounting condition and, after completion of the mounting, to form an undercut which counteracts detachment of the two assemblies. The first assembly has a stop which is movable between an operative position, which assists in maintaining the undercut of the locking element and in which the locking element bears against the stop and/or in which the locking element is deformable against the stop, and a detachment position, in which the stop, in relation to the operative position, is spaced further apart from the locking element and in which the locking element is deformable into a detachment condition for detachment of the two assemblies.