Flared Kitchen Knife Handle Geometry for Secure Precision Grip
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Solution Overview
Problem
Existing kitchen knives often fail to balance design criteria such as comfort, safety, muscle fatigue prevention, cutting precision, and grip optimization, leading to suboptimal user experience and potential premature blade wear.
Innovation Solution
A knife design featuring a handle with specific geometric angles and flares, including a longitudinal flare angle between 3° and 8° and a transverse flare angle between 1° and 5°, ensuring a snug fit with the user's hand and preventing rotation, while allowing for efficient cutting motion without excessive pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the handle is made with conventional geometry, then manufacturing is simple, but grip security and user comfort deteriorate
Solution Approach 1:
The patent applies parameter changes by defining specific angular parameters for the handle geometry: a longitudinal flare angle (α) between 3° and 8°, and a transverse flare angle (β) between 1° and 5°. These precise parameter specifications transform the handle from a conventional simple shape to an optimized geometric form that enhances grip security while maintaining manufacturing feasibility through defined angular ranges.
Solution Approach 2:
The patent introduces dimensional complexity by adding flare in both longitudinal and transverse directions. The longitudinal flare creates an angled surface relative to the blade axis, while the transverse flare adds width variation across the handle. This two-dimensional flaring approach transforms a basic cylindrical or rectangular handle into a multi-faceted geometric form that adapts to hand contours and improves grip reliability.
2Force
If excessive pressure is applied on the handle, then cutting force increases, but muscle fatigue worsens
Solution Approach 1:
The patent employs curvature principles through the flared handle geometry that creates rounded, ergonomic surfaces. The longitudinal and transverse flares generate curved contact areas that conform to the natural contours of the user's hand, distributing pressure across broader surfaces. This curved geometric approach reduces localized stress points and enables efficient force transmission with reduced muscular effort.
3Ease of operation
If the handle shape does not adapt to hand shape, then manufacturing is easier, but grip comfort and safety deteriorate
Solution Approach 1:
The patent applies asymmetry through the handle's flared geometry that creates non-uniform surfaces tailored to hand contours. The longitudinal flare produces an asymmetric profile when viewed from the side, while the transverse flare creates asymmetric width distribution. These asymmetric geometric features mirror the natural asymmetry of human hand shapes, enhancing grip comfort and safety without requiring fully custom-shaped handles for each user.
Data Source
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AI summary
The invention relates to a knife comprising a blade (1) and a handle (2) having a joining portion and a main gripping portion (200), wherein the main gripping portion (200) of the handle (2) has a shape having a longitudinal flaring extending in the longitudinal plane and defined by a longitudinal flaring angle α formed between a lower edge (222) and an upper edge (221), the longitudinal flaring angle α having a set value of between 3° and 8°, and wherein the joining portion is such that the ratio between the lower joining arrow (FiJ) and the joining height (HJ) decreases in the longitudinal direction (L) starting from the blade (1) and going towards the main gripping portion (200).