Frame Mounting System with Hidden Corner Pleats for Fabric Tensioning
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Solution Overview
Problem
Current methods for assembling stretched canvas frames are laborious, prone to errors, and result in suboptimal acceptability rates due to insecure corner joints, fabric sagging, and visible bulk at corners, which complicates the process and affects the longevity of the framed product.
Innovation Solution
A frame design with corner features that allow internal fabric pleats to be hidden and retained within partial slots at the miter angles, combined with a jig system using fences and tools for accurate and efficient fabric installation, ensuring secure tensioning and alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional manual tensioning methods are used, then fabric can be stretched over the frame, but the process is laborious and requires specialized tools and skill
Solution Approach 1:
A jig system with fences and tools is introduced as an intermediary device to assist in the accurate and efficient installation of fabric. The jig provides guided pathways and positioning mechanisms that simplify the installation process, eliminating the need for specialized manual tensioning tools and skill while reducing assembly time.
Solution Approach 2:
The frame is pre-assembled with corner features and partial slots before fabric installation. The jig is also prepared in advance with appropriate tools and positioning elements. This preliminary preparation eliminates the need for complex on-site adjustments and reduces the overall assembly time while maintaining ease of installation.
2Ease of manufacture
If excess fabric is gathered at corners using conventional methods, then the frame can be assembled, but visible bulk remains at corners affecting appearance
Solution Approach 1:
The corner features are designed with partial slots that extract and conceal the excess fabric within the miter joint structure itself. Instead of allowing fabric to gather externally at corners, the design incorporates hidden storage spaces within the corner joints, removing the visual bulk while maintaining assembly simplicity.
Solution Approach 2:
The excess fabric is nested within the corner features and partial slots of the frame structure. The fabric pleats are tucked inside the miter joints, creating a nested configuration where the fabric is contained within the frame's own structural elements, eliminating external bulk while preserving assembly ease.
3Ease of manufacture
If conventional corner joining methods are used, then the frame can be assembled, but corner joints are insecure leading to potential racking and buckling
Solution Approach 1:
The corner features are designed with specialized local geometries including partial slots and recesses that provide enhanced mechanical interlocking at the corners specifically. These localized structural modifications create secure attachment points for both the frame joints and fabric pleats, strengthening corner joints without complicating the overall assembly process.
Solution Approach 2:
The corner features with their securing geometries are pre-formed during frame manufacturing. The partial slots and recesses are built into the corner pieces before assembly, allowing for automatic alignment and secure joining during the assembly process without requiring additional fastening operations, thus maintaining ease of assembly while improving reliability.
4Ease of operation
If fabric is installed without proper tensioning, then assembly is simpler, but fabric sags over time reducing product longevity
Solution Approach 1:
The tensioning system is designed to be self-adjusting through the interaction between the fabric, corner features, and partial slots. As fabric is installed and wrapped around the frame, the corner features automatically create friction and mechanical resistance that maintain tension. The system serves itself by using the installation process to create the tensioning mechanism, eliminating the need for separate tensioning operations while ensuring long-term fabric stability.
Solution Approach 2:
The corner features are designed with geometries that anticipate and counteract future fabric sagging. The partial slots and recesses create friction zones and mechanical interlocks that are established during installation to prevent future relaxation. This beforehand cushioning against sagging forces ensures long-term durability without requiring complex active tensioning mechanisms.
Data Source
AI summary
A system for mounting a covering (e.g., a fabric material) upon a frame is constructed from a plurality of elongated frame parts. Each frame part has two mitered ends and a channel formed therein. The related mounting method includes the steps of: (a) using a jig to hold the fabric material against the frame; (b) inserting a plurality of retaining splines within respective channels so as to capture the fabric material within the channels between one retaining spline and a corresponding floor of the channel, whereby a plurality of corner pleats are formed; and (c) using a tool to invert each corner pleat into a corner joint formed between respective adjacent frame parts so as to form an internal fold at each corner of the frame.