Seat Recessed Seam Fastener Structure for Easy Cover Replacement
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Solution Overview
Problem
The existing seat designs with recessed seams face issues of poor workability during formation and frequent attachment/detachment, leading to potential bending or distortion of seams and deterioration of joining properties between hook and loop fastener halves, resulting in easy separation.
Innovation Solution
A seat with a recessed seam structure featuring an opening-and-closing fastener system, where a first fastener half is sewn to the cover's back face and a second fastener half is adhered to the cushion material using a tape-shaped base material, allowing easy alignment and sliding for reliable seam formation and frequent detachment without positional displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If hook and loop fastener halves are pressed together to form recessed seams, then the seams can be formed easily, but the seams may be subjected to bending or distortion when pressed in a careless way
Solution Approach 1:
Guiding portions are introduced as intermediary elements that mediate between the fastener halves. These guiding portions extend from the fastener halves and guide them to align properly during the pressing operation, ensuring precise seam formation without requiring careful manual alignment while preventing bending or distortion of the seams
Solution Approach 2:
The guiding portions are pre-formed and attached to the fastener halves before the final assembly operation. This preliminary configuration ensures that when the fastener halves are pressed together, they automatically align along the correct path defined by the guiding portions, eliminating the need for careful manual alignment during the pressing operation
2Adaptability or versatility
If hook and loop fastener halves are frequently attached and detached, then the cover can be frequently changed, but the joining properties between the fastener halves deteriorate and fastening performance decreases
Solution Approach 1:
The fastening system is segmented into two independent halves: one attached to the cover and the other to the cushion material. This segmentation allows the cover side fastener half to be easily removed and replaced with a new one when the joining properties deteriorate, while the cushion material side fastener half remains fixed and functional. This enables frequent attachment and detachment of covers without permanently degrading the overall fastening system reliability
Solution Approach 2:
The cover-attached fastener half is designed to be replaceable rather than permanent. When this fastener half shows signs of wear or deteriorated joining properties after frequent use, it can be discarded and replaced with a new fastener half, while the cushion material side fastener half is recovered and reused. This extends the overall system life and maintains fastening performance through component replacement
3Manufacturing precision
If hook and loop fastener halves are pressed together while aligning accurately, then seam distortion is prevented, but the operation becomes complex and workability is reduced
Solution Approach 1:
Guiding portions serve as intermediary mechanical guides that physically constrain the alignment process. These guiding portions extend from the fastener halves and fit together like puzzle pieces, automatically ensuring precise alignment during the pressing operation without requiring the operator to manually align the components carefully. This maintains high seam alignment precision while significantly simplifying the operation
Solution Approach 2:
The guiding portions enable the fastener halves to self-align during the pressing operation. The geometric configuration of the guiding portions ensures that when the fastener halves are brought together, they automatically orient themselves in the correct alignment without requiring external guidance or careful manual positioning by the operator
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
This configuration improves workability and allows for frequent and reliable attachment/detachment of the cover, preventing seam distortion and maintaining strong fastening performance.
Implementation Method 1
a second fastener half fixed to the cushion material
Implementation Method 2
an opening-and-closing fastener configured to couple the cover and the cushion material
Data Source
AI summary
A recessed seam structure for a cover (3) that improves workability when forming a recessed seam (A) and allows frequent attachment and detachment at the recessed seam (A) is provided. In a seat (1) having the recessed seam (A) formed by pulling part of the cover (3) toward a side of a cushion material (2), the recessed seam (A) is provided with an opening and closing fastener (30) configured to couple the cover (3) and the cushion material (2), and the opening and closing fastener (30) includes a first fastener half (31) fixed to a back face of the cover (3) and a second fastener half (32) fixed to the cushion material (2). In such a seat (1), the recessed seam (A) can be formed easily and reliably on the seat (1) by aligning an end of the first fastener half (31) in a longitudinal direction and an end of the second fastener half (32) in the longitudinal direction of the opening and closing fastener (30) and simply sliding a slider (33).