Multi-Functional Saw Quick-Change Locking for Secure Tool-Free Blade Swaps
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Solution Overview
Problem
Current multi-functional saws face safety hazards and operational complexity due to loose saw blades during rotation and require auxiliary tools for quick change, with existing solutions experiencing mechanical failures over time.
Innovation Solution
A quick change structure for multi-functional saws incorporating a head housing, output shaft, quick change handle, eccentric block, movable rod, compression springs, locking pins, and a positioning ring, allowing for tool-free and simplified saw blade exchange by leveraging an eccentric mechanism and spring forces to securely lock the saw blade.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure plate and inner hexagon screws are used to fasten the saw blade, then the saw blade can be securely fastened, but the fastening and dismantling operations become complicated and require auxiliary tools
Solution Approach 1:
The locking mechanism is segmented into multiple locking lugs (typically 3-6) distributed around the circumference of the saw blade, each independently engaging with corresponding slots in the arbor. This segmentation allows the blade to be securely locked at multiple points while enabling simple radial insertion and automatic locking, eliminating the need for complex screw fastening procedures
Solution Approach 2:
The saw blade incorporates integrated locking lugs that automatically engage with the arbor slots upon insertion. The blade's own structure provides the locking function without requiring external locking components or auxiliary tools, enabling users to quickly install and remove blades by simply pulling the blade off the arbor
2Ease of operation
If no locking safety structure is provided, then the fastening operation is simpler, but the saw blade tends to become loose during rotation creating safety hazards
Solution Approach 1:
The locking lugs are pre-formed as integral parts of the saw blade structure, positioned and oriented correctly before the blade is installed. When the blade is inserted onto the arbor, the lugs automatically align with and engage the slots, providing immediate positive locking without requiring any additional safety structures or complex fastening procedures
Solution Approach 2:
The locking lugs are designed with asymmetric profiles that match the corresponding slots in the arbor, allowing insertion in only one orientation. This asymmetric design ensures proper engagement of the locking surfaces while preventing incorrect installation, providing both simplicity and reliability simultaneously
3Reliability
If hexagon wrench is required for fastening, then secure fastening is achieved, but the wrench must be portable and tends to be lost
Solution Approach 1:
The locking function is extracted from the saw blade body and implemented as separate, integrated locking lugs that are part of the blade's mounting interface. This extraction eliminates the need for separate hexagon wrenches or other auxiliary fastening tools, as the locking action is achieved through the direct engagement of the blade's own lugs with the arbor slots
Solution Approach 2:
The fastening and locking functions are merged into the saw blade's mounting interface design. The locking lugs are combined with the blade mounting holes to create an integrated system where the blade itself performs both the mounting and locking functions, eliminating the need for separate fastening tools
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 saw blade dismantling and changing without auxiliary tools, enhancing safety and reducing mechanical failures by securely locking the saw blade using an eccentric mechanism and spring forces.
Implementation Method 1
a small cylindrical compression spring arranged at the bottom of the movable rod; the top of the small cylindrical compression spring contacts the bottom of the movable rod
Implementation Method 2
the cylindrical compression spring is externally sleeved on the plastic support block, and has a top end supported at the lower surface of the convex strip at the top of the movable bracket, and a bottom end supported at the upper surface of the plastic fixed seat
Implementation Method 3
the quick change handle is matched with the eccentric block, and is connected to the top of the head housing through a first cylindrical pin
Data Source
AI summary
The present invention relates to a quick change structure for multi-functional saws and a quick change method. The quick change structure has a head housing, an output shaft and a quick change device. On the quick change device, a quick change handle can be pulled to drive an eccentric block, a movable rod, a small cylindrical compression spring and a movable bracket in turn such that the second cylindrical pin at the lower part of the movable bracket moves downward in the guide slot of each one of locking pins, driving the locking pins to rotate around a third cylindrical pin to fold together. After a saw blade is placed, the locking pins will unfold when an upward force is applied, and then the locking pins lock the saw blade to realize quick change of the saw blade.