Belt Insert Trapezoidal Cross-Section for Crack Prevention
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Solution Overview
Problem
Blood pressure measurement devices face durability issues due to stress concentration at burrs formed on edges of inserts in the belt, leading to cracking during use.
Innovation Solution
A belt design featuring a band-like shape with a resin material belt body and an insert made of higher tensile strength material, where the insert's cross-section between holes is trapezoidal, distributing load across side surfaces to prevent stress concentration and cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the insert is formed from a plate-like member by stamping using pressing, then the insert can be manufactured efficiently, but burrs may be formed at edges of the insert causing stress concentration and cracking
Solution Approach 1:
The harmful burrs are removed from the edges of the insert through additional processing steps after stamping, extracting the defective portions to prevent stress concentration and cracking while maintaining the efficient stamping manufacturing process
Solution Approach 2:
The insert edges are pre-treated with rounding or chamfering before assembly to prevent burr formation, or protective measures are taken during the stamping process to avoid creating harmful edge features that could lead to cracking
2Device complexity
If the insert includes burrs at the edges, then manufacturing is simpler, but stress concentrates at the burrs leading to cracking in the belt
Solution Approach 1:
The burrs are extracted or removed from the insert edges through additional manufacturing steps, eliminating the stress concentration points while maintaining the overall simplicity of the stamping process
Solution Approach 2:
The edges of the insert are locally modified with rounding or chamfering treatments to improve stress distribution, while the rest of the insert maintains its original simple stamped structure
Data Source
AI summary
A belt providing improved durability and a blood pressure measurement device. A second belt of a belt of a blood pressure measurement device includes a second belt body constituted in a band-like shape using a resin material and including a plurality of small holes formed along a longitudinal direction, and a second insert being disposed in the second belt body and including a plurality of holes with a plurality of the small holes disposed on an inner side of the respective holes, a cross section of a portion of the second insert, which is between two adjacent holes and orthogonal to a width direction of the second belt body, being constituted like a trapezoid with a short side being disposed on a living body side, and the second insert being formed of a material having a higher tensile strength than the resin material constituting the second belt body.