Handheld Electric Device Changeable Head Sealing Design
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Solution Overview
Problem
Current hand-held electric devices with changeable heads have complex assembly structures and poor waterproof sealing, making assembly and disassembly inconvenient and compromising the overall waterproof effect.
Innovation Solution
A hand-held electric device design featuring a hand-held part with a first sealing ring, an inner casing with a second sealing ring, and a head with a third sealing ring, along with sliding and elastic members for easy assembly and disassembly, ensuring watertight seals through interference fits at multiple positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a retractable sleeve is added to enable head replacement, then the head can be disassembled from the barrel body, but the assembly structure becomes complicated and waterproof sealing is compromised
Solution Approach 1:
The device is divided into distinct segments: a hand-held body, an inner casing that slides within the hand-held body, and an outer casing that slides within the inner casing. Each casing has its own sealing ring, creating modular waterproof compartments. This segmentation allows the head to be easily replaced while maintaining waterproof integrity through multiple independent sealing zones.
Solution Approach 2:
The patent implements a nested structure where the outer casing is sleeved on the inner casing, which is in turn installed on the hand-held body. The outer casing slides back and forth along the axial direction of the inner casing, enabling head replacement through simple axial movement. This nested arrangement consolidates multiple protective and functional elements into a compact, space-efficient design that maintains waterproof sealing while enabling easy head replacement.
2Ease of operation
If a retractable sleeve is added to enable head replacement, then the head can be disassembled from the barrel body, but the waterproof sealing effect deteriorates due to blind areas
Solution Approach 1:
The waterproof sealing system is segmented into three independent sealing zones, each with its own sealing ring positioned at critical interfaces: between the hand-held body and inner casing, between the inner casing and outer casing, and between the outer casing and head. This segmentation ensures that waterproof protection is maintained at every potential leakage point, eliminating blind areas and ensuring comprehensive sealing even during head replacement operations.
3Reliability
If multiple sealing rings are added to improve waterproof sealing, then the waterproof effect is improved, but the assembly structure becomes more complicated
Solution Approach 1:
The patent merges the protective and sealing functions into an integrated casing system. The inner casing and outer casing serve both as protective enclosures and as mounting structures for their respective sealing rings. This merging of functions eliminates the need for separate protective housings and sealing mechanisms, simplifying the overall assembly structure while maintaining robust waterproof protection through multiple strategically positioned sealing rings.
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
Simplifies assembly and disassembly while significantly improving the waterproof sealing effect, ensuring the device remains watertight during use and maintenance.
Implementation Method 1
a first sealing ring is interference fit with the inner side wall of the outer casing, a second sealing ring is interference fit with the inner side wall of the outer casing, and a third sealing ring is interference fit with the inner side wall of the inner casing
Data Source
AI summary
The present disclosure relates to a hand-held electric device with changeable head, includes an electrical hand-held part and a head. The electrical hand-held part has a hand-held body, an inner casing and an outer casing, the hand-held body has a first sealing ring located at the front end thereof, the inner casing is mounted at the front end of the hand-held body and the outer wall of is provided with a second sealing ring. The outer casing slides back and forth along the axis of the inner casing at the outside of the inner casing. The head includes a head body and an assembling and matching part disposed at the rear end of the head body, the assembly mating part is detachably assembled on the inner side of the inner casing, and the assembling and matching part is provided with a third sealing ring.