Grinder Paddle Lever and Rear Housing Assembly Layout
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Solution Overview
Problem
The assembly of electric grinders is complicated due to the division of the tail cover into two parts, leading to potential interference with internal components during switch operation.
Innovation Solution
A work machine design where the lever and housing are integrated as a single member, with a stopper part and engaging mechanism to restrict rotation, and a snap-fitting connection for the rotating shaft, improving assembly efficiency and reducing component interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the tail cover is divided into left and right parts, then the assembly can accommodate internal components, but the assembly process becomes complicated and productivity decreases
Solution Approach 1:
The patent merges the tail cover into a single integrated piece rather than dividing it into left and right parts. This unified structure eliminates the need for complex assembly operations while still providing adequate space for internal components through optimized layout design, thereby improving assembly productivity without sacrificing adaptability.
Solution Approach 2:
The patent repositions the switch lever assembly from a configuration that requires divided housing to a single-piece tail cover. By changing the spatial arrangement and utilizing three-dimensional space more effectively, the design accommodates internal components within the unified housing structure, avoiding the need for complex multi-part assembly.
2Ease of manufacture
If the switch lever is assembled with divided tail covers, then the housing can be configured, but the assembly process becomes complicated
Solution Approach 1:
The patent combines the tail cover into a single piece, which simplifies the assembly process by eliminating the need to join multiple housing parts. The unified tail cover maintains the necessary structural configuration for the switch lever assembly while reducing assembly complexity to a single integration step.
Solution Approach 2:
The patent segments the housing into functionally distinct but structurally unified parts. The tail cover is designed as a single piece that integrates the switch lever mounting function, while the overall housing maintains modular configuration for ease of manufacture. This functional segmentation without physical division simplifies assembly while preserving manufacturing ease.
3Adaptability or versatility
If internal components are placed in the housing, then the structure is complete, but wiring may interfere with the switch lever operation
Solution Approach 1:
The patent extracts the switch lever assembly from the confined space near internal components by positioning it in a dedicated area of the unified tail cover. This separation removes the potential interference between wiring and the switch lever, allowing internal components to be fully integrated without compromising lever operation.
Solution Approach 2:
The unified tail cover acts as an intermediary structure that separates the switch lever assembly from internal wiring components. By providing a dedicated mounting area and spatial buffer, the tail cover prevents direct contact and interference between the lever and wiring, enabling complete internal structure integration while maintaining operational smoothness.
Data Source
AI summary
The present invention addresses the issue of improving an assembly property. In a grinder, a paddle lever is rotatably connected to a rear housing. In addition, a rotating shaft that is rotatably supported by the rear housing is formed with the paddle lever, and a stopper part for regulating the rotation range of the paddle lever is formed with the rear housing. Furthermore, the rear housing and the paddle lever are each constituted by a single member. Through this, the assembly property of the grinder can be improved.