Cantilever Snap Tab Attachment Device with Outboard Locator Tabs
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Solution Overview
Problem
Existing attachment devices with snap tabs fail to effectively restrict all degrees of freedom, leading to play and undesired movement between connected workpieces.
Innovation Solution
An attachment device featuring a cantilever snap tab with outboard locator tabs and a receiver with a u-shaped band, providing gaps for resilient movement and beveled edges for smooth connection, along with a locking lug and cam surface for secure engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a simple snap tab attachment device is used, then the device is inexpensive to manufacture and easy to operate, but it fails to restrict all degrees of freedom, resulting in play and undesired movement between workpieces
Solution Approach 1:
The attachment device is divided into distinct functional segments: a resilient cantilever snap tab for insertion and locking, separate outboard locator tabs for positioning, and a U-shaped band receiver with channel for constraining movement. This segmentation allows each component to be optimized for its specific function while maintaining overall simplicity and low manufacturing cost.
Solution Approach 2:
The cantilever snap tab is designed as a resilient, flexible component that dynamically adapts during insertion and locking. The tab flexes to pass through the receiver opening and then springs back to engage the channel, providing automatic locking without requiring complex mechanisms or high manufacturing precision.
2Ease of operation
If a simple snap tab attachment device is used, then the device is easy to operate, but it fails to provide efficient restriction of degrees of freedom, allowing movement between workpieces
Solution Approach 1:
The device separates locking function (cantilever snap tab engaging channel) from positioning function (outboard locator tabs), allowing simple one-handed operation for locking while comprehensive movement restriction is achieved through the combination of multiple constrained elements working together.
Solution Approach 2:
The resilient cantilever snap tab automatically performs both insertion and locking actions through its own elastic deformation. When pressed into the receiver, it flexes to pass through the opening and springs back to engage the channel, providing self-locking without requiring additional tools or complex mechanisms.
3Reliability
If multiple locator tabs and gaps are added to restrict movement, then connection stability is improved, but device complexity increases
Solution Approach 1:
The attachment head is segmented into a resilient cantilever snap tab and rigid outboard locator tabs, with gaps strategically positioned to allow resilient movement. This segmentation enables comprehensive movement restriction through simple geometric relationships rather than complex mechanical structures.
Solution Approach 2:
The cantilever snap tab functions as a flexible element that provides both positioning and locking functions. The gaps between the snap tab and locator tabs allow the flexible tab to deform slightly, accommodating manufacturing tolerances and providing smooth engagement without requiring precise fits or complex adjustment mechanisms.
4Manufacturing precision
If outboard locator tabs with guide surfaces are added, then centering function is improved, but manufacturing precision requirements increase
Solution Approach 1:
The gaps between the cantilever snap tab and outboard locator tabs provide flexibility that compensates for manufacturing variations. This allows the use of less expensive manufacturing processes while still achieving proper centering and alignment through the self-centering action of the flexible tab within the receiver opening.
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 device efficiently restricts all degrees of freedom, ensuring a flush and secure connection between workpieces, eliminating play and allowing for easy locking and unlocking.
Implementation Method 1
a first gap between the cantilever snap tab and the first outboard locator tab... a second gap between the cantilever snap tab and the second outboard locator tab... through which the locking tab passes as the attachment head is secured to the receiver
Data Source
AI summary
An attachment device is provided for securing a first workpiece to a second workpiece. The attachment device includes an attachment head and a receiver. The attachment head includes a cantilever snap tab, a first outboard locator tab and a second outboard locator tab. The receiver includes an opening for receiving and holding the cantilever snap tab, the first outboard locator tab and the second outboard locator tab.