Thinning Shears with Rounded Comb Blade Tip
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Solution Overview
Problem
Conventional thinning shears struggle to efficiently cut crosswise hair mixed with straight hair, particularly when it grows in directions different from the rest, and existing solutions for clipping gray hairs are not designed for efficient crosswise cutting.
Innovation Solution
The design includes a comb blade longer than the bar blade, with corner-rounded tip-edges and teeth widths not exceeding 1 mm, featuring indentations at the tip-ends, allowing the comb blade to be set on the scalp and moved in the hair growth direction to catch and cut crosswise hair effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional thinning shears are used with the bar blade longer than the comb blade, then the shears can effectively cut hair when held in conventional positions, but they cannot efficiently cut crosswise hair growing in different directions from the scalp
Solution Approach 1:
The patent inverts the conventional blade length relationship by making the comb blade longer than the bar blade. This inversion allows the comb blade tip to safely contact the scalp and guide the shears along hair growth direction, enabling effective cutting of crosswise hair that grows in different directions, while the bar blade remains positioned upward away from the scalp.
2Productivity
If the comb blade tip is made sharp with a 90-degree corner, then the shears can effectively cut hair, but the tip may injure the scalp when contacted
Solution Approach 1:
The patent applies local quality by differentiating the tip characteristics of the two blades. The comb blade tip is processed to have a rounded corner with a radius of 0.5mm or more to prevent scalp injury, while the bar blade tip maintains a sharp 90-degree corner for effective hair cutting. This localized differentiation allows each blade to serve its specific function safely and effectively.
3Object-affected harmful factors
If the comb blade is made longer than the bar blade, then the shears can safely contact the scalp with the comb blade tip, but the bar blade becomes shorter and may not reach sufficient hair length
Solution Approach 1:
The patent utilizes the dynamic movement of the shears along the hair growth direction, guided by the longer comb blade that contacts the scalp. This dynamic usage allows the shorter bar blade to effectively reach and cut hair at various lengths as the shears move, compensating for its reduced length through proper operational technique rather than relying on static blade length.
4Productivity
If conventional thinning shears are used to target crosswise hair, then straight hair can be cut, but crosswise hair mixed in with straight hair cannot be effectively targeted and cut
Solution Approach 1:
The patent employs preliminary action by using the rounded comb blade tip to first contact and guide along the scalp, which preliminarily positions and separates crosswise hair from straight hair in the hair growth direction. This preliminary guidance action enables the bar blade to then effectively cut the crosswise hair that has been positioned by the comb blade's movement along the scalp.
Data Source
AI summary
Afforded are thinning shears optimal for cutting crosswise hair growing along the scalp, as well as crosswise hair disturbing the passing of a comb through hair bundles. The thinning shears, in thinning shears furnished with a comb blade and a bar blade for haircutting, are characterized in that the comb blade is longer than the bar blade, and the tip-edge of the comb blade is corner-rounding processed. Adopting this configuration makes it possible to set the tip-edge portion of the comb blade on a scalp and slide the comb blade heading in the direction that the hair grows, to efficiently thin out crosswise hair such as would disturb combing, without injuring the scalp.