Inverted Curved Pan Handle for Lower Lifting Torque
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Solution Overview
Problem
Conventional pan handles require excessive effort to lift due to their design, leading to strain and injury, particularly affecting the upper limbs and fingers, as they increase the moment of force needed, which is not efficiently addressed by existing curved handle designs.
Innovation Solution
A pan with a continuous, curved handle that has a concavity towards the cooking surface, featuring a 'C' shape with a flat thumb support and finger concavity, reducing the moment of force required for lifting by shortening the arm length and distributing load evenly, thus reducing strain on the user's wrist and forearm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the handle is elongated to enable better grip, then the ease of operation is improved, but the moment of force needed to lift the pan increases
Solution Approach 1:
The handle curvature is inverted compared to conventional designs. Instead of convexity towards the cooking surface, the handle has convexity away from the cooking surface, with the arc positioned closer to the pan body. This inversion reduces the moment arm while maintaining ergonomic grip, thereby decreasing the moment of force required for lifting.
Solution Approach 2:
The handle is designed with a specific curvature radius (R1 for the arc, R2 for the grip portion) that optimizes the spatial arrangement. By carefully controlling the curvature in the vertical dimension and positioning the grip portion at an optimal height, the design reduces the horizontal moment arm while preserving vertical grip comfort.
2Force
If the handle curvature is increased to reduce lifting effort, then the force required is reduced, but the difficulty of grasping increases
Solution Approach 1:
Different portions of the handle have different curvature characteristics optimized for their specific functions. The first portion (near the pan) has a specific curvature radius R1 for structural efficiency and reduced moment arm, while the second portion (grip area) has a different curvature radius R2 optimized for hand comfort and grasping ease. This local differentiation resolves the contradiction between force reduction and grasping ease.
Solution Approach 2:
The handle employs controlled curvature with specific radius values (R1 and R2) to achieve optimal mechanical properties. The curved geometry allows the handle to follow an ergonomic path that reduces the moment arm while maintaining a comfortable grip surface, balancing force reduction with grasping ease.
3Ease of operation
If the handle extends further from the pan, then the grip distance is increased, but the structural stress on fastening points increases
Solution Approach 1:
The handle arc is positioned closer to the pan body rather than extending far outward. This inverted arrangement reduces the lever arm and consequently the structural stress on fastening points, while the optimized curvature and grip portion positioning maintain sufficient grip distance for ergonomic operation.
Solution Approach 2:
The curved geometry with controlled radius R1 near the pan distributes structural stresses more effectively compared to a straight or excessively extended handle. The curvature allows for more favorable stress distribution along the handle length, reducing peak stresses at fastening points while maintaining operational effectiveness.
Data Source
Figure 1~2
Figure 3~8
Figure 9~10
AI summary
Description of a pan (1) with a curved handle (2) having a free end (8). The curvature of the handle (2) has the concavity facing the cooking surface (3) and the free end (8) at a height (h), with respect to a horizontal supporting plane of the pan (1), higher than the height of the fastened end (6) of the handle (2). Said handle (2) has starting from the fastened end (5, 6) of the pan (1) a first section (4) that extends outward connected to a second section (7) for grasping which extends inward.