Press-Stud Locking Structure for Lateral Traction Resistance
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Solution Overview
Problem
Conventional press-studs can become unfastened under lateral traction, making them unsuitable for applications requiring transverse force resistance, and they often have aesthetic and size issues.
Innovation Solution
A press-stud design with a male element and female element featuring a disconnection prevention mechanism, including a narrowed connection portion and widened portion, which engages in a blocked configuration under lateral force, ensuring secure fastening without visible sharp edges and minimal size increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional press-stud design is used, then the structure is simple and easy to manufacture, but it cannot resist lateral traction forces and becomes unfastened
Solution Approach 1:
The connection portion is segmented into distinct functional zones: a narrowed portion for elastic retention member engagement and a widened portion for lateral force resistance. This segmentation allows each segment to specialize in resisting specific force directions, achieving lateral traction resistance without requiring a completely complex new structure.
Solution Approach 2:
The invention adds a dimensional feature to the connection portion by creating a widened portion that extends radially outward. This dimensional change provides a mechanical barrier against lateral movement while maintaining compatibility with the existing axial engagement mechanism, thus improving lateral resistance without proportionally increasing overall complexity.
2Reliability
If a head with hole and cylindrical member is added to prevent disconnection, then lateral traction resistance is improved, but the stud becomes larger and has visible cut edges
Solution Approach 1:
The invention merges the disconnection prevention function with the existing connection portion geometry. Instead of adding a separate head with hole and cylindrical member, the narrowed and widened portions are integrated directly into the connection portion, combining structural integrity with aesthetic considerations by eliminating visible cut edges.
Solution Approach 2:
The aesthetic improvement is achieved through local quality modification: the outer surface of the connection portion is designed to be smooth and substantially free of cut edges in the widened portion, while the narrowed portion maintains the functional geometry needed for retention member engagement. This allows aesthetic requirements to be met in visible areas without compromising functional performance.
3Reliability
If an annular extension piece is added to the male element head, then lateral traction resistance is improved, but the stud becomes bulky and heavy
Solution Approach 1:
The anti-disconnection feature is segmented into the narrowed and widened portions of the connection portion, which are integrated into the existing stud structure rather than added as separate bulky components. This segmentation achieves lateral force resistance with minimal material addition, keeping the stud lightweight.
Solution Approach 2:
The connection portion geometry is designed to dynamically respond to lateral forces: under normal conditions, the narrowed portion engages the elastic retention member; under lateral traction, the widened portion engages the cavity walls. This dynamic engagement provides lateral resistance without requiring permanently bulky structural features.
4Reliability
If the connection portion is narrowed for retention member engagement, then fastening reliability is improved, but the ease of intentional unfastening may be reduced
Solution Approach 1:
The elastic retention member provides dynamic engagement: under normal fastening conditions, the narrowed portion securely engages the retention member for reliable fastening; during intentional unfastening, sufficient force applied in the connection direction causes the retention member to deform elastically and release from the narrowed portion. This dynamic behavior maintains both security and ease of operation.
Solution Approach 2:
The engagement strength is controlled by parameter optimization: the narrowed portion dimensions are designed to provide sufficient friction and mechanical interference for secure fastening, while the elastic retention member's material properties and geometry are selected to allow controlled deformation during unfastening. This parameter balancing achieves both reliability and operational ease.
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 design prevents accidental unfastening under transverse forces, maintains a compact and aesthetically pleasing appearance, and allows easy intentional disengagement, suitable for applications like bag straps where transverse forces are common.
Implementation Method 1
an elastically deformable engagement member, typically a ring, which is mounted in the female element, in a receiving seat
Implementation Method 2
A disconnection prevention projection can be provided in the cavity... a disconnection prevention widened portion... In the blocked configuration, the disconnection prevention widened portion can interfere with the disconnection prevention projection of the female element
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A press-stud (10) comprises a male element (12) and a female element (14) which can be connected to each other in a connection direction; the female element (14) comprises a cavity (54) in which an elastic retention member (62) is received and in which a disconnection prevention projection (58) is provided; the male element (12) comprises an abutment portion (16), from which there extends a connection portion (20), on which there are formed a narrowed portion (31) and, at the opposite side of the abutment portion (16) with respect to the narrowed portion (31), a disconnection prevention widened portion (28). In a connected configuration of the press-stud (10), the connection portion (20) is inserted in the cavity (54) of the female element (14) with the elastic retention member (62) arranged around the narrowed portion (31), a transverse movement of the male element with respect to the female element by a predetermined value with respect to the connection direction bringing the press-stud (10) into a blocked configuration, in which the disconnection prevention widened portion (29) interferes with the disconnection prevention projection (58) of the female element (14) and the abutment portion (16) of the male element comes into contact with an external portion (64) of the female element (14).