Load-Bearing Fabric Edge Molding With Integrated Stretch Clamps
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Solution Overview
Problem
Existing methods for molding load-bearing fabrics with integrated edges face challenges such as high costs, product quality issues, and inefficiencies in stretching and molding processes, particularly when trying to maintain a stretched fabric condition during the manufacturing of chair components.
Innovation Solution
A load-bearing surface molding apparatus with an integrated stretching assembly that uses localized clamps to hold the fabric in a stretched condition, allowing for precise molding of polymeric edges while accommodating different fabric widths and applying varying degrees of stretch to different regions, thereby reducing the risk of edge distortion and improving edge quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the fabric is stretched using a remote stretching machine and shuttled to a loom station, then the fabric can be held in a stretched condition, but the process complexity and manufacturing time increase significantly
Solution Approach 1:
The patent combines the stretching function and molding function into a single integrated apparatus. The stretching assembly with clamps is integrated directly into the molding apparatus, eliminating the need for separate remote stretching machines and loom stations. This allows the fabric to be stretched and molded in one continuous operation, reducing process complexity while maintaining manufacturing precision.
Solution Approach 2:
The fabric is stretched using clamps in advance before the molding operation begins. The stretching assembly positions and tensions the fabric to the desired degree, and then the molding operation proceeds on the pre-stretched fabric. This preliminary stretching action ensures the fabric is properly prepared for molding without requiring complex shuttling operations.
2Manufacturing precision
If hydraulic components are included in the mold to apply stretch after fabric closure, then some stretch control is achieved, but the cost and device complexity increase
Solution Approach 1:
The patent replaces complex hydraulic stretching systems with a simpler mechanical clamp-based stretching mechanism. The stretching assembly uses mechanically actuated clamps that can be opened and closed to apply and release tension on the fabric. This mechanical approach achieves sufficient stretch control without the high cost and complexity of hydraulic components integrated into the mold.
3Ease of manufacture
If the mold parts are specially shaped to stretch the fabric during closing, then the stretching process is simplified, but the stretch amount cannot be adjusted
Solution Approach 1:
The patent employs dynamically adjustable clamps that can be positioned at different locations and opened to varying degrees. The clamps are mounted on movable carriers that can be adjusted along the fabric width, and the clamp opening distance can be controlled to achieve different stretch amounts. This dynamic adjustment capability provides both manufacturing simplicity and stretch adaptability.
Solution Approach 2:
The stretching function is divided into multiple independent clamp units that can be individually adjusted. Rather than relying on a single fixed mold shape, the patent uses segmented clamps that can be positioned and actuated independently to create various stretching patterns and amounts, enhancing both ease of manufacture and adaptability.
4Manufacturing precision
If clamp assemblies are movable on slide assemblies to stretch the fabric, then the stretching assembly becomes complex, but the fabric can be stretched uniformly
Solution Approach 1:
The patent designs the clamps to serve multiple functions: they grip the fabric for stretching, they position the fabric edges, and they can be adjusted to accommodate different fabric widths. The carriers that hold the clamps can move to position the clamps, and the same assembly is used for both stretching and holding functions throughout the molding process, reducing overall device complexity while maintaining stretch uniformity.
Data Source
AI summary
An apparatus for forming molded edges on opposite sides of a load bearing surface including a stretching assembly integrated into a molding assembly. The stretching assembly may include localized fabric clamps that leave the center region of the fabric free (e.g. not clamped) through the process. The clamps may be arranged so that once extended to stretch the fabric, the fabric is held by the clamps in the appropriate position for molding. The fabric may be held so that opposed edges terminate in the mold cavities. The mold parts may cooperatively define two spaced apart mold cavities, and may include a mold pocket to provide space to store excess fabric. The fabric may be held against the surface of the mold cavity during the molding process, for example, using hold-down pins and special gate configurations. The molding apparatus may include an alternative stretching assembly configured to provide different amounts of stretch to different portions of the fabric blank. The alternative stretching assembly may include additional intermediate clamps.