Insertion Frame Latch Hole Segmentation for Positioning Accuracy
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Solution Overview
Problem
Existing insertion frame structures face issues with positioning accuracy and member detachment due to larger clearance in latch holes, requiring additional rivets and increasing complexity in assembly and load support.
Innovation Solution
The proposed insertion frame structure features primary and auxiliary members with L-shaped or angular U-shaped cross-sections, where latch holes have a larger clearance initially followed by a smaller clearance matching the auxiliary member's thickness, allowing for precise alignment and secure joining without rivets, utilizing convex portions for secure engagement and load distribution across multiple surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the clearance of the latch hole is made larger than the plate thickness to facilitate assembly, then the ease of manufacture is improved, but the positioning accuracy between members deteriorates
Solution Approach 1:
The latch hole clearance is divided into two segments: a first clearance (larger dimension) that facilitates assembly by allowing the convex portion to be inserted easily, and a second clearance (smaller dimension equal to or less than plate thickness) that provides precise positioning. This segmentation resolves the contradiction by providing both easy assembly and accurate positioning within the same structural feature.
2Ease of manufacture
If the clearance of the latch hole is made larger than the plate thickness to facilitate assembly, then the ease of manufacture is improved, but the members become easily detached when load is applied
Solution Approach 1:
The latch hole clearance is divided into two segments: a first clearance (larger dimension) that facilitates assembly by allowing the convex portion to be inserted easily, and a second clearance (smaller dimension equal to or less than plate thickness) that provides precise positioning. This segmentation resolves the contradiction by providing both easy assembly and accurate positioning within the same structural feature.
3Reliability
If a latch member such as a rivet is added to prevent detachment, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The latch member (rivet) is extracted/removed from the structure. Instead, the latch hole itself is designed with a two-stage clearance system that provides both easy insertion and secure retention, eliminating the need for additional fastening components and reducing overall structure complexity.
4Reliability
If a latch member such as a rivet is added to prevent detachment, then the reliability is improved, but the work processes such as swaging increase
Solution Approach 1:
The latch member (rivet) is extracted/removed from the structure. Instead, the latch hole itself is designed with a two-stage clearance system that provides both easy insertion and secure retention, eliminating the need for additional fastening components and reducing overall structure complexity.
Data Source
AI summary
To enhance the positioning accuracy between primary members and auxiliary members without need of latch parts such as rivets, an insertion frame structure includes: a pair of primary members having L-shaped cross-sections and placed with the L shapes facing to each other symmetrically; and several auxiliary members having angular U-shaped cross-sections between the primary members. The primary members and the auxiliary members are joined at latch portions. The latch portions of the primary members have clearance-shaped latch holes. The latch portions of the auxiliary members have convex portions to be inserted into the latch holes. Each latch hole has a clearance with a larger dimension than a plate thickness t of the auxiliary members, and continuously from the clearance, a clearance with a dimension smaller than the plate thickness t of the auxiliary members.