Dust Collection Cover Separation Lock for Blade Exchange

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Solution Overview

Problem

Existing dust collection covers for cutting devices, particularly those with a double structure, face challenges in operability during the exchange of rotary cutting blades, as they often accidentally separate, making the process cumbersome and inefficient.

Innovation Solution

The design incorporates a separation lock member and an opening stopper to prevent accidental separation of the main body cover from the fixing cover, allowing for easier and safer exchange of the rotary cutting blade by controlling the rotation and separation angles, and utilizing a support groove for the rotation support shaft to facilitate switching between separable and unseparable states.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the main body cover and fixing cover are made separable to improve blade exchange operability, then the ease of operation improves, but accidental separation occurs during transport

Engineering Contradiction:

Improveblade exchange operabilityVSAvoidcover attachment stability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The lock member is activated in advance to prevent accidental separation during transport. The lock member engages with the rotation support shaft to secure the main body cover to the fixing cover before any separation can occur, and only deliberately disengaged when blade exchange is intended.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The cover system transitions from a static fixed state to a dynamic controllable state. The lock member enables the system to switch between locked (during transport) and unlocked (during blade exchange) states, providing operational flexibility while maintaining security when needed.

Inventive Principle:

Principle #15Dynamics

2Ease of operation

If the cutting device is moved upward to expose the rotary cutting blade for exchange, then the ease of operation improves, but the operation area becomes insufficient

Engineering Contradiction:

Improveblade attachment accessibilityVSAvoidoperation area

Core Design Contradiction:

Ease of operationVSArea of stationary object

Solution Approach 1:

The dust collection cover is segmented into separable main body cover and fixing cover portions. This allows the main body cover to be opened independently to provide access to the rotary cutting blade while the fixing cover remains in place, effectively increasing the operation area without requiring full device displacement.

Inventive Principle:

Principle #1Segmentation

3Ease of operation

If the fixing cover is separated from the main body cover to increase operation area, then the ease of operation improves, but the sealability deteriorates

Engineering Contradiction:

Improveblade exchange accessibilityVSAvoiddust collection sealability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The cover system dynamically adjusts its state based on operational needs. During normal operation, the covers remain sealed together for optimal dust collection. During blade exchange, the lock member is deliberately disengaged to allow temporary separation for access, after which the cover can be resecured to restore sealability.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS10173345B2Dust collection cover for cutting devices

Publication Date: 2019.01.08 MAKITA CORP

AI summary

A separation lock member is provided in a main body cover. When a fixing cover is rotated with respect to the main body cover at a predetermined opening/closing angle (opening angle θ1) and then an unlock operation of the separation lock member is performed, a rotation support shaft can be separated from a support groove 23a, such that the main body cover can be separated from the fixing cover.