Angle Grinder Housing Ring for Smaller Grip and Stable Assembly
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Solution Overview
Problem
Existing handheld power tools face ergonomic issues due to large grip size caused by screw bosses perpendicular to the rotor shaft, necessitating screw connections that increase the housing circumference.
Innovation Solution
A housing ring connects the first and second housing parts at the front, securing them without a transverse screw connection, allowing for a smaller grip size and improved mechanical stability, with features like overlapping, axial staggering, and vibration decoupling to enhance ergonomics and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If screw bosses are formed perpendicular to the rotor shaft to accommodate screws for connecting housing parts, then the housing parts can be securely connected, but the outer circumference of the housing increases, worsening ergonomics
Solution Approach 1:
The screw connection is reoriented from a transverse arrangement (perpendicular to rotor shaft) to a longitudinal arrangement (parallel to rotor shaft). This dimensional change allows screws to be positioned along the axial direction, eliminating the need for protruding screw bosses that increase the housing's outer circumference, while maintaining secure connection between housing parts
Solution Approach 2:
Instead of forming screw bosses outwardly perpendicular to the rotor shaft, the invention inverts the approach by positioning screw connections axially parallel to the rotor shaft, allowing screws to be accommodated within the housing structure without increasing the external dimensions, thus improving ergonomics while maintaining connection stability
2Area of stationary object
If a housing ring is introduced to connect housing parts, then grip size is reduced and ergonomics improve, but device complexity increases
Solution Approach 1:
The housing ring serves multiple functions simultaneously: it connects the first and second housing parts together, provides structural support for the electric motor, enables axial screw connections, and defines the reduced outer circumference for improved ergonomics. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity
Solution Approach 2:
The housing ring merges several structural functions into a single component, combining the roles of housing connector, motor support structure, and ergonomic boundary element. This consolidation reduces the number of separate parts needed, offsetting the added complexity by eliminating the need for traditional transverse screw boss arrangements
Data Source
AI summary
A handheld electric power tool, in particular an angle grinder, having a housing that comprises a first housing part and a second housing part, having an electric motor that is accommodated in the housing and drives a rotor shaft that is connected in a force-transmitting manner to an output unit accommodated in a gear head. A housing ring is provided that connects the first housing part to the second housing part at the front.