Conical Retaining Ring Housing for Ergonomic Power Tool Handles
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Solution Overview
Problem
Ergonomics in handle design for handheld power tools, particularly those with a straight design, are compromised by the need for additional locking mechanisms like screws near the handle, which can be uncomfortable and reduce tool durability, and existing ergonomic improvements often add complexity to assembly.
Innovation Solution
A power tool design featuring a housing with conical outer and inner surfaces that utilize a retaining ring to securely hold the housing portions together without screws, enhancing ergonomics and simplifying assembly by applying a radial force as the conical surfaces are axially displaced, allowing for a smooth and comfortable grip and efficient assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If additional locking mechanisms like screws are used near the handle, then the housing portions are securely held together, but ergonomics are compromised and tool durability is reduced
Solution Approach 1:
The patent removes screws and other fastening elements from the handle area by extracting the traditional screw-based joining method entirely. Instead, it uses a snap-fit mechanism with elastic deformation of the housing portions to achieve secure connection without any protruding fasteners that would interfere with grip comfort.
Solution Approach 2:
The patent introduces an intermediary mechanism - the elastic deformation capability of the housing portions themselves - to mediate between the need for strong connection and the need for smooth ergonomics. The housing material acts as a mediator that provides both structural integrity and surface smoothness through its elastic properties.
2Ease of operation
If additional grip portions or supporting handles are added to improve ergonomics, then comfort is enhanced, but assembly complexity increases
Solution Approach 1:
The patent merges the ergonomic handle design with the structural housing components themselves. The handle portions are integrated into the housing halves rather than being separate auxiliary components, eliminating the need for additional assembly steps while maintaining ergonomic benefits.
Solution Approach 2:
The housing portions serve multiple functions simultaneously: they provide structural enclosure, form the ergonomic handle surfaces, and act as the joining mechanism through their elastic snap-fit capability. This multi-functionality eliminates the need for separate components for each function.
3Ease of operation
If softer materials are used for the handle portion to provide suitable friction, then ergonomics are improved, but tool lifetime is reduced due to wear resistance
Solution Approach 1:
The patent applies local quality by creating different surface characteristics on different portions of the handle. The external surfaces are designed with ergonomic contours and textures for grip, while the internal structural portions maintain hardness for durability. This localized differentiation allows both soft grip surfaces and hard structural components coexist.
Solution Approach 2:
The patent employs composite material strategies by combining different material properties within the housing structure. The handle portions use materials or surface treatments optimized for friction and comfort, while the structural core uses harder materials for wear resistance, creating a composite structure that satisfies both requirements.
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
The solution improves ergonomics by eliminating potentially harmful discontinuities near the handle and simplifies assembly, providing a secure and comfortable housing structure that reduces wear and tear while maintaining tool efficiency and usability.
Implementation Method 1
the retaining ring comprises an inner surface, the inner surface comprising a conical inner surface portion adapted to cooperate with the conical outer surface portion such that a radial force is exerted on the first and second housing portions by means of the ring as the conical inner surface and the conical outer surface are axially displaced with respect to one another
Data Source
AI summary
A handheld electric power tool includes a drive train assembly arranged along a longitudinal axis of the tool, a housing adapted to receive the drive train assembly, and a retaining ring. The housing includes a first portion and a second portion adapted to form the housing, which has a conical outer surface portion having a substantially circular cross section. The retaining ring includes an inner surface having a conical inner surface portion adapted to cooperate with the conical outer surface portion such that a force is exerted on the first and second housing portions via the retaining ring as the conical inner surface and the conical outer surface are axially displaced with respect to one another, thereby urging the first and second housing portion together.