Train Wheel Bridge Decoration via Inverted Jewel Embedding

Solution Overview

Problem

Existing methods for decorating train wheel bridges, such as those described in JP-A-2003-72293, can compromise the appearance and durability of the decorative portion when embedding jewels, leading to potential damage during the driving process.

Innovation Solution

A method involving cutting, smoothing, roughening, and drilling steps to form groove portions, smooth portions, and jewel receiving holes on the train wheel bridge, ensuring equal intervals and matching surface roughness, along with embedding jewels from the opposite side to prevent damage, is employed.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a jewel is embedded in the train wheel bridge after pattern formation, then the decorative pattern can be completed, but the decorative portion may be damaged during the driving process

Engineering Contradiction:

Improvejewel embedding processVSAvoiddecorative portion integrity

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The jewel receiving hole is formed before embedding the jewel, allowing the jewel to be inserted from the opposite side without risking damage to the decorative pattern. This preliminary preparation of the hole structure enables safe jewel embedding while preserving the integrity of the decorative portion.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Instead of embedding the jewel from the front side after pattern formation, the invention embeds the jewel from the opposite side through a pre-formed hole. This reversed approach allows the jewel to be inserted without applying force that could damage the decorative pattern.

Inventive Principle:

Principle #13The other way round (Inversion)

2Shape

If the top portion between groove portions is smoothed, then a clean appearance is achieved, but the jewel may be damaged during driving

Engineering Contradiction:

Improvesurface smoothnessVSAvoidjewel integrity

Core Design Contradiction:

ShapeVSReliability

Solution Approach 1:

The jewel receiving hole is formed before embedding the jewel, allowing the jewel to be inserted from the opposite side without risking damage to the decorative pattern. This preliminary preparation of the hole structure enables safe jewel embedding while preserving the integrity of the decorative portion.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The smoothing treatment is applied locally to the top portion between groove portions to achieve a clean appearance, while the jewel receiving hole is positioned and formed in a way that prevents contact between the jewel and the decorative pattern during operation.

Inventive Principle:

Principle #3Local quality

3Shape

If groove portions are formed at equal intervals, then a uniform decorative pattern is achieved, but the jewel embedding becomes more complex

Engineering Contradiction:

Improvepattern uniformityVSAvoidjewel embedding process

Core Design Contradiction:

ShapeVSDevice complexity

Solution Approach 1:

The jewel receiving hole is formed before embedding the jewel, allowing the jewel to be inserted from the opposite side without risking damage to the decorative pattern. This preliminary preparation of the hole structure enables safe jewel embedding while preserving the integrity of the decorative portion.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20240019813A1Train Wheel Bridge Decorating Method, Train Wheel Bridge, And Timepiece

Publication Date: 2024.01.18 SEIKO EPSON CORP

AI summary

A method for decorating a train wheel bridge including a jewel includes: a cutting step for forming a plurality of groove portions at a first surface of the train wheel bridge; a smoothing step for smoothening a top portion formed between the groove portions adjacent to each other; a roughening step for roughening a decorative portion including the groove portions and a smooth portion as a result of the smoothing step; and a drilling step for forming a jewel receiving hole extending from the first surface to a second surface on an opposite side to the first surface.