Gardening Shear Pivot Locking Mechanism and Blade Coating
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Solution Overview
Problem
Gardening tools like shears and secateurs face issues such as blades becoming dull and prone to breaking, varying sizes not accommodating all users, and maintenance challenges due to loose or tight pivot mechanisms, leading to safety hazards and inefficient cutting.
Innovation Solution
A garden tool design featuring a pivot mechanism with a main spindle and bolt, and a locking mechanism using a retaining cap to prevent main bolt rotation, ensuring appropriate blade alignment and preventing tampering, along with AlCrN functional layers on cutting blades for enhanced durability and reduced friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the main bolt is made adjustable to allow tightening and loosening, then the blade alignment can be optimized, but the bolt may become loose or too tight during usage
Solution Approach 1:
The blade alignment is adjusted during manufacture or initial setup to the optimal position, and then the locking mechanism prevents any further adjustment during use. This preliminary action ensures both precise alignment and stable operation without requiring user intervention.
Solution Approach 2:
A locking mechanism comprising a retaining cap and retaining bolt acts as an intermediary between the adjustable main bolt and the external environment. This intermediary secures the main bolt in its optimal position, preventing it from becoming too loose or too tight during usage while maintaining the ability to adjust alignment when needed.
2Duration of action of stationary object
If the cutting blades are made harder to extend blade life, then the blades last longer, but the blades become prone to fracturing
Solution Approach 1:
The blade material properties are optimized by controlling hardness parameters within a specific range, and the blade geometry is adjusted by changing the ground angle parameters. This allows the blades to achieve extended lifetime through controlled wear resistance while maintaining sufficient toughness to prevent fracturing.
Solution Approach 2:
The blade is constructed using composite material principles, combining a hard outer layer for cutting edge durability with a tougher substrate for fracture resistance. This layered approach allows the blade to achieve both extended lifetime and maintained strength, avoiding the brittleness associated with uniformly hard materials.
3Reliability
If the retaining cap covers the main bolt head to prevent tampering, then safety is improved, but access for adjustment is restricted
Solution Approach 1:
The locking mechanism is designed to be dynamically reversible - the retaining cap provides continuous coverage and protection during normal operation, but can be easily removed or opened when adjustment is required. This dynamic design allows the system to switch between safety mode and maintenance mode as needed.
Solution Approach 2:
The retaining cap is designed as a separate, removable component that can be taken out when adjustment is needed. This extraction of the protective cover allows access to the main bolt head for adjustment while maintaining protection during normal use. The retaining bolt can also be removed to release the locking action.
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A garden tool (1, 101, 201) for cutting and/or pruning comprises: a first shear part (2) and a second shear part (3), at least one of the first and second shear parts (2, 3) having a cutting blade (106), each of the first and second shear parts having a shaft or lever arm (5, 7); a pivot mechanism rotatably connecting the first and second shear parts (2, 3) with each other, the pivot mechanism comprising a main spindle (8) and a main bolt (9); and a locking mechanism which comprises a retaining cap (14), wherein the locking mechanism is removably attachable to the first or second shear part (2, 3) such that when the retaining cap (14) is attached to the first or second shear part the retaining cap (14) covers the head (11, 81) of the main bolt (9), wherein the locking mechanism is configured to prevent rotation of the main bolt (9) with respect to the shear part to which the locking mechanism is removably attachable.