Slide Cutting Shears With Adjustable Pivot Pin
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Solution Overview
Problem
Conventional hair cutting shears require frequent opening and closing while performing 'slide cuts,' leading to snagging, frizz, split ends, and strain on the hairdresser's hand and wrist, as the sharp edges catch hair shafts, preventing precise layering.
Innovation Solution
A pair of hair cutting shears with a novel blade design featuring identical 53-degree angled cutting edges, adjustable pivot pin, and ergonomic finger grips, allowing for smooth sliding without repeated opening, reducing strain and improving cutting stroke adjustability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hair scissors are used for slide cuts, then the cutting function is achieved, but the scissors require frequent opening and closing which causes snagging, frizz, and split ends
Solution Approach 1:
The patent applies the dynamics principle by making the finger blade movable relative to the thumb blade through an adjustable pivot pin mechanism. This allows the finger blade to dynamically adjust its position and angle during the sliding motion, enabling continuous cutting without repeated opening and closing actions that cause snagging and frizz.
Solution Approach 2:
The patent implements parameter changes by allowing adjustment of the pivot pin position to modify the blade angles and cutting stroke length. This enables optimization of the cutting parameters to achieve smooth sliding cuts while maintaining reliable cutting performance without the harmful effects of frequent opening and closing.
2Productivity
If conventional scissors are used for slide cuts, then cutting is performed, but repeated opening and closing causes strain on the hand and wrist
Solution Approach 1:
The adjustable pivot pin mechanism enables dynamic adjustment of the cutting stroke length and blade motion characteristics. This allows the operator to optimize the cutting motion for smooth continuous sliding, eliminating the repetitive opening and closing actions that cause hand and wrist strain while maintaining high cutting efficiency.
Solution Approach 2:
By allowing adjustment of the pivot pin position, the patent enables modification of cutting parameters including stroke length and blade angle. This optimization reduces the physical strain on the operator's hand and wrist during prolonged use while maintaining productive cutting performance.
3Measurement precision
If conventional scissors are used, then cutting action is achieved, but the sharp edge catches hair shafts preventing precise layering
Solution Approach 1:
The movable finger blade with adjustable pivot pin creates a dynamic cutting system where the blade can smoothly follow the hair shaft during sliding. This eliminates the catching and snagging of hair by the fixed sharp edge, enabling precise layering cuts with consistent results throughout the sliding motion.
Solution Approach 2:
The ability to adjust the pivot pin position allows optimization of the blade cutting angle and stroke characteristics. This ensures the cutting edge interacts with the hair shaft in a controlled manner during sliding, achieving both precision in cut placement and consistency in cut quality without snagging or frizz.
Data Source
AI summary
A pair of slide cutting shears that have identical cutting angles of approximately 53 degrees on the thumb and finger blades, and where the thumb blade has approximately only 40% of the top end of the blade sharpened and the remaining section of the working blade is radiused and cannot cut. The shears have a four finger grip, and adjustable bump stop and a tightenable pivot pin assembly to draw the blades closer.