Dust Collection Cover Segmentation for Blade Replacement

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Solution Overview

Problem

Existing dust collection covers with double structures for cutting devices face challenges in operability, particularly in replacing rotary cutting blades and adjusting cutting depths, due to complex constructions and lack of mechanisms for reliable locking of opening/closing angles.

Innovation Solution

A dust collection cover design featuring a main body cover and a fixing cover with a compression spring biased to open, allowing for easy separation and reassembly without reassembling the spring, along with a cutting depth adjustment stopper and a fixing stopper for locking arbitrary angles, enhancing operational efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a torsion spring is attached to the rotary support shaft to bias the main body cover upward, then the cutting device can be automatically returned to the upper position, but it becomes difficult to set a large rotation range and requires disassembly of the rotary support shaft and torsion spring for blade replacement

Engineering Contradiction:

Improveautomatic return functionVSAvoidblade replacement operability

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The dust collection cover is divided into separable main body cover and fixing cover portions, allowing the main body cover to be detached from the fixing cover for blade replacement without affecting the torsion spring mechanism attached to the rotary support shaft on the fixing cover

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The torsion spring mechanism is extracted and attached specifically to the rotary support shaft on the fixing cover, allowing the main body cover to be separated and replaced independently while the torsion spring remains on the fixing cover to provide automatic return function

Inventive Principle:

Principle #2Taking out (Extraction)

2Duration of action of moving object

If the main body cover is supported to rotate via a rotary support shaft with a torsion spring, then automatic return to upper position is achieved, but the rotation range cannot be set large and reassembly is time-consuming

Engineering Contradiction:

Improverotation rangeVSAvoidreassembly time

Core Design Contradiction:

Duration of action of moving objectVSLoss of time

Solution Approach 1:

The dust collection cover is segmented into separable covers allowing independent handling of each component, enabling the main body cover to be detached and reattached without disturbing the torsion spring pre-adjustment on the fixing cover

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The torsion spring is pre-adjusted and attached to the rotary support shaft on the fixing cover before main body cover attachment, so that when the main body cover is reattached, the automatic return function and rotation range are already configured without requiring time-consuming reassembly adjustments

Inventive Principle:

Principle #10Preliminary action

3Reliability

If a double structure dust collection cover is used with overlapping main body cover and fixing cover, then higher sealability and dust collection efficiency are obtained, but the construction becomes complex and operability deteriorates

Engineering Contradiction:

Improvedust collection efficiencyVSAvoidoverall operability

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The double structure dust collection cover is segmented into separable main body cover and fixing cover portions connected via rotary support shaft, allowing independent operation and replacement of the main body cover while maintaining the sealed configuration during cutting operations

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The main body cover is designed to be rotatable relative to the fixing cover via the rotary support shaft, allowing dynamic opening and closing motion that maintains sealability during operation while enabling easy access for blade replacement by rotating to an open position

Inventive Principle:

Principle #15Dynamics

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Improves the operability of cutting devices by simplifying blade replacement, allowing precise cutting depth adjustments, and ensuring reliable locking of the cutting blade position, leading to more efficient and precise cutting operations.

Implementation Method 1

the fixing cover is biased toward an opening direction by a compression spring so as to be opened with respect to the main body cover

Methodology Applied

Scientific EffectCompression spring: Spring

Implementation Method 2

the compression spring is retained so as to be expanded and contracted along an arc centered on the rotary support shaft

Methodology Applied

Scientific EffectArc-shaped expansion and contraction:

Data Source

PatentUS9937638B2Dust collection cover for cutting devices

Publication Date: 2018.04.10 MAKITA CORP

AI summary

A compression spring is retained in a spring retaining portion provided in a fixing cover. By a pressing portion formed in a main body cover, the compression spring can be pressed to generate a biasing force in an opening direction of the main body cover. The compression spring is retained in the spring retaining portion. Accordingly, the fixing cover and main body cover can be easily assembled.