Detachable Motor and Handle Assembly for Modular Electric Tools
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Solution Overview
Problem
The high cost of electric tools, particularly for occasional users, and the need for a cost-effective solution to reduce the expense of owning and maintaining a variety of electric tools.
Innovation Solution
A detachable assembly design for electric tools, where the motor and operating handle are independent components with non-circular cross-sections and connection structures, allowing for interchangeable use of motors and handles to create different types of electric tools, reducing the need to replace the entire tool upon failure of individual parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electric tools are designed as integrated units with motors permanently attached to handles, then the tool structure is simple and reliable, but the cost is high and users must replace entire tools when components fail
Solution Approach 1:
The patent divides the electric tool into separable modules: a motor unit with non-circular cross-section motor shaft and a handle unit with corresponding assembly hole, connected through detachable connection structures. This segmentation allows independent replacement of failed components (motor or handle) rather than replacing the entire tool, reducing long-term costs while maintaining reliable operation through modular design
Solution Approach 2:
The patent creates universal connection interfaces where a single motor unit can be attached to multiple different handle types through standardized non-circular connection structures. This universality enables users to invest in one motor unit and use it across various handles for different applications, improving cost-effectiveness and adaptability
2Adaptability or versatility
If electric tools are designed as modular detachable assemblies, then the cost is reduced and component replacement is easier, but the device complexity increases
Solution Approach 1:
The patent employs asymmetric non-circular cross-sections for the motor shaft and assembly hole (such as D-shaped or polygonal profiles) to enable detachable connection while preventing misalignment. The asymmetric shape provides inherent orientation guidance during assembly, reducing the complexity of proper alignment compared to circular designs that would require additional positioning features
Solution Approach 2:
The patent integrates the connection structure directly into the motor body and handle assembly, combining the motor mounting function with the drive transmission function. The motor shaft itself serves as both the drive element and the connection element, eliminating the need for separate mounting mechanisms and reducing overall assembly complexity despite the modular design
3Adaptability or versatility
If non-circular cross-sections are used for motor shaft and assembly hole, then detachable assembly is enabled and component independence is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The patent uses simple asymmetric geometries for the non-circular cross-sections (such as D-shapes with flat sides and curved portions, or basic polygonal forms) that are easy to manufacture with standard machining processes. These simplified asymmetric shapes provide sufficient alignment precision without requiring complex tooling or high-precision manufacturing, balancing detachable assembly capability with manufacturing feasibility
Solution Approach 2:
The patent applies the non-circular cross-section feature only at the specific connection interface (motor shaft and assembly hole) where detachable assembly is needed, while other parts of the motor and handle can be manufactured with standard tolerances. This localized application of special geometry minimizes the overall impact on manufacturing precision requirements
Data Source
AI summary
A motor includes a motor body and a motor shaft with a first end connected to an inside of the motor body and a second end protruding out of the motor body, wherein a first cross section of the motor shaft perpendicular to its axial direction is non-circular, whose shape and size are matched with the shape and size of a second cross section of an assembly hole for shaft in an operating handle perpendicular to a depth direction thereof, and the assembly hole for shaft allows the motor shaft to extend into a transmission gear box of the operating handle for assembly, the motor body is provided with a connection structure for handle, and the connection structure for handle is configured to fit with a connection structure for motor at the operating handle, to realize a detachable assembly of the motor on the operating handle.