Straight Grinder Collet Clutch for Quick Grinding Head Changes
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Solution Overview
Problem
Existing hand-held straight grinders require complex and inefficient disassembly and assembly processes for grinding heads, necessitating the use of both hands to press a spindle locking button and tighten a locking nut.
Innovation Solution
The hand-held straight grinder incorporates an elastic collet assembly, a clutch assembly, and a power assembly, allowing the elastic collet to be driven axially through a toggling unit, enabling quick and convenient disassembly, assembly, and replacement of grinding heads without auxiliary tools, using a sliding output shaft and a radial contraction/expansion mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spindle locking button and locking nut mechanism is used to secure grinding heads, then the grinding heads can be firmly fixed, but the disassembly and assembly process becomes complex and time-consuming
Solution Approach 1:
The locking mechanism is segmented into modular components: the collet body, locking nut, and spring-loaded locking ball. This segmentation allows each component to perform its specific function independently, simplifying the overall operation while maintaining secure fixation. The user simply needs to operate the locking nut, which internally coordinates the locking ball movement to engage or disengage from the collet body grooves.
Solution Approach 2:
The spring-loaded locking ball automatically engages with the grooves on the collet body when the locking nut is tightened, and automatically disengages when the locking nut is loosened. This self-service mechanism eliminates the need for complex manual operations or additional tools, allowing users to quickly secure or remove grinding heads by simply rotating the locking nut.
2Reliability
If a spindle locking button and locking nut mechanism is used to secure grinding heads, then the grinding heads can be firmly fixed, but disassembling and assembling efficiency decreases
Solution Approach 1:
The spring-loaded locking ball is pre-positioned to automatically engage with the grooves on the collet body as soon as the locking nut begins to tighten. This preliminary action ensures that fixation is established during the tightening process itself, rather than requiring a separate locking step. Similarly, when loosening, the locking ball automatically disengages, enabling quick tool head changes without compromising fixation reliability.
3Reliability
If the elastic collet assembly is designed with a conical surface and notches, then the opening can be reliably expanded and contracted, but the manufacturing complexity increases
Solution Approach 1:
The conical surface on the elastic collet provides a curved geometry that naturally guides the radial expansion and contraction movement. When the locking mechanism applies axial force, the conical surface converts this into uniform radial motion, ensuring reliable opening expansion. The curvature also distributes stress evenly, enhancing durability while maintaining manufacturability through standard machining processes.
Solution Approach 2:
The elastic collet is segmented with notches that divide the structure into flexible segments. These notches allow the collet to expand and contract radially in a controlled manner while maintaining structural integrity. The segmented design enables reliable radial movement through simple notch cuts rather than complex mechanisms, balancing functionality with manufacturing ease.
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
This design simplifies the replacement process, reduces material requirements for the outer shell, improves manufacturing efficiency and cost, and allows for easy assembly and disassembly of grinding heads, enhancing user convenience and reducing production costs.
Implementation Method 1
an elastic collet assembly containing an elastic collet and a collet connector, wherein a tail end of the elastic collet is connected to a front end of the collet connector; an opening is formed at one end of the elastic collet, and the opening communicates with an internal space of the elastic collet
Data Source
AI summary
A hand-held straight grinder is provided. The hand-held straight grinder includes an elastic collet, an output shaft, a clutch assembly and a power assembly, where an opening is formed in one end of the elastic collet, and communicates with an internal space of the elastic collet; one end of the output shaft is in transmission connection to the power assembly, and the other end of the output shaft axially sleeves the elastic collet in a sliding manner, and is radially and fixedly connected to the elastic collet; the other end initially extends to the opening, and the opening is in a radial contracted state through cooperation; the clutch assembly includes a toggling unit, a first clutch unit and a second clutch unit, where the toggling unit is located between the first clutch unit and the second clutch unit.