Grinding Tool Housing Layout for Auxiliary Handle Detector Wiring

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Solution Overview

Problem

Existing grinding tools face challenges in facilitating wiring between the auxiliary handle detector and the controller due to the presence of the motor and fan, making it difficult to avoid interference and maintain efficient operation.

Innovation Solution

A grinding tool design with a cylindrical inner and outer housing structure that accommodates the motor, featuring handle mounts and detectors for the auxiliary handle, and wiring that extends between the inner and outer housings to electrically connect the controller and detector, thereby avoiding interference with the motor and fan.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If wiring is routed inside the housing to connect the controller and handle detector, then electrical connection is established, but the motor and fan are interfered with and vibration is transmitted

Engineering Contradiction:

Improveelectrical connectionVSAvoidmotor interference and vibration

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The housing is divided into an inner housing and an outer housing, creating separate spatial zones. The wiring is routed in the annular space between these two housings, separating it from the motor components while maintaining electrical connectivity between the controller and handle detector.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The outer housing acts as an intermediary structure that provides a dedicated pathway for wiring. This intermediary space between the inner and outer housings serves as a buffer zone that isolates the wiring from motor vibrations while facilitating electrical connections.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Volume of moving object

If the controller is located behind the motor in the housing, then space utilization is improved, but wiring between the detector and controller becomes difficult

Engineering Contradiction:

Improvespace utilizationVSAvoidwiring complexity

Core Design Contradiction:

Volume of moving objectVSDevice complexity

Solution Approach 1:

The wiring path is moved from a two-dimensional plane to a three-dimensional space by utilizing the annular region between the inner and outer housings. This dimensional transition allows wiring to bypass the motor area and reach the controller located behind it without interference.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The inner housing containing the motor is nested within the outer housing, creating a concentric structure. The wiring is placed in the space between these nested housings, allowing it to extend from the front (handle detector location) to the rear (controller location) without crossing motor components.

Inventive Principle:

Principle #7Nested doll (Nesting)

Data Source

PatentUS12544876B2Grinding tool

Publication Date: 2026.02.10 MAKITA CORP

AI summary

A grinding tool facilitates wiring between a detector for an auxiliary handle and a controller. A grinding tool includes a motor, a housing including an inner housing accommodating the motor and an outer housing covering an exterior of the inner housing and extending rearward from the inner housing, a spindle protruding from a front of the housing, rotatable when driven by the motor, and including a protruding end to receive a tip tool, a controller that controls driving of the motor, a handle mount located at the front of the housing to receive an auxiliary handle in a detachable manner, a handle detector that electrically detects an attachment of the auxiliary handle to the handle mount, and wiring extending between the inner housing and the outer housing to electrically connect the controller and the handle detector.