Diaper Fastener Hook Unit Segmentation for Elastic Arm Security
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Solution Overview
Problem
Existing diaper fasteners using rigid hook members risk separation due to stem fracture or elastic material tearing, potentially causing choking or injury to infants.
Innovation Solution
A diaper fastener with elastically extensible arms and hook units composed of two permanently clipped parts, featuring a channel-shaped clamping part with inwardly directed clipping formations and a hook part with integral teeth, ensures secure attachment and prevents separation, with pull tabs for easy extension and grip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a rigid hook member with stem is used to attach to elastic arm, then assembly is simplified, but reliability deteriorates due to stem fracture or elastic material tearing
Solution Approach 1:
The hook member is divided into two separate parts: a rigid hook part with teeth and a flexible clamping part. These parts are permanently clipped together, eliminating the need for a stem that could fracture. The segmentation allows each part to be optimized for its specific function while improving overall reliability.
Solution Approach 2:
The hook unit combines two different parts with complementary properties: a rigid hook part for structural stability and tooth engagement, and a flexible clamping part for secure attachment to the elastic arm. This composite structure prevents separation by distributing stresses across different material properties.
2Reliability
If permanently clipped hook units are used, then reliability improves by preventing separation, but device complexity increases due to multiple parts
Solution Approach 1:
The two parts of the hook unit (hook part and clamping part) are permanently clipped together to form a single functional unit that remains attached throughout use. This merging prevents separation while maintaining the benefits of having two specialized components for different functions.
3Ease of operation
If elastic material is stretched to engage teeth with fabric, then fastening function is achieved, but risk of material tearing increases
Solution Approach 1:
Separating the rigid hook member into two parts allows the clamping part to bear the attachment stresses to the elastic arm, while the hook part with teeth engages the fabric. This segmentation prevents stress concentration that could lead to material tearing.
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 solution provides a secure and safe fastening mechanism that prevents accidental separation of hook units from the base member, ensuring the diaper remains securely in place without risking infant injury.
Implementation Method 1
a diaper fastener comprising a substantially planar base member, at least a part of which is elastically extensible... with the elastically extensible part stretched and operative to maintain the teeth in engagement with the diaper fabric
Implementation Method 2
at least one of the hook units is composed of two parts that are permanently clipped together from opposite sides of the base member by inter-engaging formations
Implementation Method 3
teeth operable to engage the fabric of a diaper in relevant zones thereof with the elastically extensible part stretched and operative to maintain the teeth in engagement with the diaper fabric
Data Source
AI summary
A diaper fastener is provided of the type having a substantially planar elastically extensible base member and three spaced hook units that have teeth operable to engage the fabric of a diaper in relevant zones thereof with the elastically extensible part stretched and operative to maintain the teeth in engagement with the diaper fabric to hold the diaper in its functional position. At least one of the hook units and generally all three are each composed of two parts that are permanently clipped together from opposite sides of the base member by inter-engaging formations. One of the parts has the hook teeth formed integral therewith and the two parts co-operate with the base member to physically locate the hook unit on the base member. Preferably, each hook unit is carried by an arm forming part of the planar base. Each hook unit has a hook part and a clamping part.