Portable Cutting Machine Belt Chamber Drainage Against Slippage

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Solution Overview

Problem

Portable cutting machines face issues with belt slippage due to water accumulation in the belt chamber, which can prevent cutting operations while increasing maintenance costs and complexity.

Innovation Solution

The portable cutting machine incorporates a design with a storage space in the case that allows liquid to enter and be discharged through a communication portion, preventing liquid accumulation in the belt chamber without compromising ease of assembly or maintenance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the sealing property of the belt chamber is increased to prevent water intrusion, then belt slippage is prevented, but ease of assembly or maintenance deteriorates and cost increases

Engineering Contradiction:
Improvesealing propertyVSAvoidease of assembly or maintenance
Core Design Contradiction:
ReliabilityVSEase of operation

Solution Approach 1:

The belt chamber is segmented into a sealed main chamber and an open drainage chamber separated by a partition wall. The drainage chamber contains the drainage hole that allows water to escape, while the main chamber maintains good sealing. This segmentation resolves the contradiction by localizing the drainage function to a specific segment, preventing belt slippage without requiring the entire chamber to be poorly sealed, thus maintaining ease of assembly and maintenance.

Inventive Principle:
Principle #1Segmentation

2Reliability

If the sealing property of the belt chamber is increased to prevent water intrusion, then belt slippage is prevented, but device complexity and manufacturing cost increase

Engineering Contradiction:
Improvesealing propertyVSAvoiddevice complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The belt chamber is segmented into a sealed main chamber and an open drainage chamber separated by a partition wall. The drainage chamber contains the drainage hole that allows water to escape, while the main chamber maintains good sealing. This segmentation resolves the contradiction by localizing the drainage function to a specific segment, preventing belt slippage without requiring the entire chamber to be poorly sealed, thus maintaining ease of assembly and maintenance.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The drainage hole automatically drains water from the belt chamber when water accumulates, without requiring external control systems, sensors, or active components. This self-service drainage mechanism prevents belt slippage through a simple passive structure, resolving the contradiction by eliminating complex active sealing or drainage systems while maintaining reliability.

Inventive Principle:
Principle #25Self-service

3Object-affected harmful factors

If water is sprayed on the cutting blade for dust prevention, then dust dispersal is prevented, but water accumulates in the belt chamber causing belt slippage

Engineering Contradiction:
Improvedust dispersalVSAvoidbelt slippage
Core Design Contradiction:
Object-affected harmful factorsVSReliability

Solution Approach 1:

The drainage hole extracts excess water from the belt chamber, separating the water removal function from the sealing function. This allows water to be continuously removed from the chamber while the cutting blade remains sprayed with water for dust prevention, resolving the contradiction by extracting the harmful water accumulation effect while preserving the beneficial dust suppression effect.

Inventive Principle:
Principle #2Taking out (Extraction)

Solution Approach 2:

The partition wall acts as an intermediary structure that directs water flow toward the drainage hole while protecting the main belt chamber from water accumulation. This intermediary element enables simultaneous water spray on the cutting blade for dust prevention and effective water drainage, preventing belt slippage without compromising dust control.

Inventive Principle:
Principle #24Intermediary (Mediator)

Data Source

PatentUS12290960B2Portable cutting machine
Publication Date: 2025.05.06 YAMABIKO CORP
  • US12290960B2 patent drawing
  • US12290960B2 patent drawing
  • US12290960B2 patent drawing

AI summary

A portable cutting machine is provided. The portable cutting machine comprises: a cutting portion including a disc-shaped cutting blade that cuts an object to be cut by rotating, and a first rotation axis that serves as a rotation center of the cutting blade; a drive portion including a drive source and a second rotation axis rotating by drive of the drive source; a transmission portion including a first pulley fixed to the first rotation axis, a second pulley fixed to the second rotation axis, and a belt looped around the first pulley and the second pulley, and configured to transmit a rotational force by the drive portion to the cutting portion; and a case including a storage space for storing the transmission portion and at least one communication portion that connect to the storage space and open to outside.