Rapid-Replacing Structure for Multifunctional Saw Blades
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Solution Overview
Problem
Multifunctional saws face difficulties in rapid blade replacement due to complex structures requiring special tools, leading to operational challenges and safety hazards without a locking mechanism.
Innovation Solution
A rapid-replacing structure for multifunctional saws incorporating a head housing, tool rest, output device with a rapid-replacing buckle, eccentric block, movable rod, spring collet, and return limit mechanism, allowing for quick blade changes and enhanced user safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressing plates and hexagon socket head cap screws are used for clamping saw blades, then the saw can securely hold the blade, but the blade replacement requires special tools and is time-consuming
Solution Approach 1:
The clamping mechanism is segmented into a pressing plate, movable rod with thread, and spring collet system that can be independently actuated. The movable rod translates rotational motion into linear motion to drive the pressing plate, allowing quick release without tools while maintaining secure clamping when engaged
Solution Approach 2:
The clamping system uses a dynamic movable rod that can rapidly transition between extended and retracted positions through thread rotation. This dynamic adjustment allows the pressing plate to quickly engage or disengage from the blade, enabling fast replacement while maintaining reliable securing when clamped
2Reliability
If hexagon socket head cap screws are used for fastening, then the blade is securely fastened, but the operation becomes complex and requires carrying a hexagon wrench
Solution Approach 1:
The fastening system is designed to be self-servicing through the spring-loaded spring collet that automatically engages with the blade center hole and the movable rod mechanism that self-actuates the pressing plate. No external hexagon wrench is needed as the thread rotation on the movable rod directly controls the clamping action
Solution Approach 2:
The fastening function merges multiple components into an integrated system: the spring collet centers and guides the blade, the movable rod provides both the driving motion and the clamping force through its thread, and the pressing plate applies the securing force. This unified mechanism eliminates the need for separate fastening tools
3Device complexity
If no locking safety structure is provided, then the structure is simpler, but personal safety hazards may occur during blade replacement
Solution Approach 1:
The spring-loaded spring collet is pre-loaded to automatically engage with the blade center hole before the pressing plate applies full clamping force. This preliminary engagement prevents the blade from slipping or ejecting during replacement, providing safety without requiring complex additional locking mechanisms
Solution Approach 2:
The compression spring provides a cushioning effect by gradually applying clamping force as the movable rod is rotated. This progressive engagement prevents sudden movements or blade ejection, ensuring safety during the blade replacement process while maintaining structural simplicity
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
Enables simple and fast blade replacement without auxiliary tools and ensures user safety by preventing instantaneous return of the rapid-replacing buckle, improving operational efficiency and safety.
Implementation Method 1
the outer side of the spring collet is provided with the compression spring. The top end of the compression spring is in close connection with the lower surface of the movable rod, and its bottom end is in close connection with the upper surface of the tool rest
Implementation Method 2
The rapid-replacing buckle and the eccentric block are connected with the top of the head housing through a straight pin. The movable rod is arranged in the output shaft, with its top end closely connected to the eccentric block
Data Source
AI summary
The present invention relates to a rapid-replacing structure of multifunctional saw, including a head housing, a tool rest and an output device, wherein the output device comprises an output shaft. It also includes a quick-change device that consists of a rapid-replacing buckle, an eccentric block, a movable rod, a collet chuck, a tensioning rod and a compression spring. The rapid-replacing buckle and the eccentric block are connected with the top of the head housing through a straight pin. The movable rod is arranged in the output shaft, with its top end closely connected to the eccentric block and its bottom end connected to the tensioning rod by screw thread. The rapid-replacing structure of the multifunctional saw can realize the purpose of blade removal and replacement simply by shifting the rapid-replacing buckle on the upper side of the head housing, without using other auxiliary means, so it is simple and fast to operate.