Power Tool Brush Element Axial Switch Mounting
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Solution Overview
Problem
Existing power tools lack flexibility in actuating element placement and stability, making them difficult to assemble and use, especially in hand tools where the brush element is far from the pushbutton switch, leading to potential wear and improper use.
Innovation Solution
A modular system with a switch means that can be slid axially onto the brush element, featuring a form-locking connection and detent means for secure mounting, allowing for adjustable actuating element placement and preventing wear by blocking improper rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the actuating element is integrated into the brush element, then the structure is simple, but the location of the actuating element cannot be adjusted relative to the pushbutton switch
Solution Approach 1:
The switch means is separated from the brush element into two independent components: the brush element and the switch means. This segmentation allows the switch means to be positioned independently relative to the pushbutton switch while keeping the brush element structure simple and functional.
Solution Approach 2:
A connecting element serves as an intermediary component that links the switch means to the brush element. This mediator enables flexible positioning of the actuating element relative to the pushbutton switch while maintaining a simple brush element design.
2Ease of operation
If the switch means is separately mounted on the housing, then the actuating element location is flexible, but additional bearing structures are required increasing complexity
Solution Approach 1:
The switch means is merged with the brush element through the connecting element, creating an integrated assembly that requires no separate bearing structures on the housing. This combination simplifies the overall structure while maintaining ease of assembly.
Solution Approach 2:
The connecting element serves multiple functions: it connects the switch means to the brush element, provides positioning, and eliminates the need for separate bearing structures. This multi-functionality reduces overall device complexity.
3Ease of operation
If the actuating element is placed far from the pushbutton switch, then the brush element structure is simple, but user convenience deteriorates and improper use increases
Solution Approach 1:
The switch means is made movable relative to the brush element through the connecting element, allowing dynamic positioning of the actuating element close to the pushbutton switch. This improves user convenience and prevents improper use while maintaining brush element simplicity.
4Adaptability or versatility
If the switch means is rigidly connected to the brush element, then the connection is stable, but the actuating element cannot be positioned freely
Solution Approach 1:
The connecting element provides a dynamic connection between the switch means and brush element, allowing the actuating element to be positioned freely within certain limits while maintaining a stable connection through form-locking engagement.
Data Source
AI summary
A power tool has an electric motor, a brush element that is supported rotatably for switchover between clockwise operation and counterclockwise operation of the electric motor and includes a brush holder, and a switch unit, embodied separately from the brush element and connected in form-locking fashion to the brush element, which switch unit has an actuating element for actuation by a user, can be slipped in the axial direction onto the brush element, located on the electric motor, and is connected in the axial direction to the brush element.