Study 03 / Mechanism design

Electric toothbrush and charging base design

How do the brush head, motor and battery fit inside a slim handle? This study follows the component layout into the charging base, molded-part draft checks and reliability test plan.

Owen Wen · Past engineering project · Anonymized

Exploded CAD view of the brush head, handle internals and charging base

Project overview33 drawings

Drawing index

What gets reviewed before tooling?

The component drawings establish the brush head support and the motor and battery positions. Draft analysis then checks how the handle, fixing bracket and charging base release from their molds.

The exterior study sets the handle profile and finish. The section view shows the space available for the motor and battery inside that grip. A second section locates the charging coil in the base, and the draft analysis checks how the base cover releases from the mold.

See drawings Brush head support in cross-section · Main housing draft analysis

Follow the design Exterior colors, materials and finishes · Battery and motor alignment · Charging base cross-section and coil · Base cover mold release analysis

Drawing series 01