3D Lifting Hook Geometry for Easier Carabiner Locking
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Solution Overview
Problem
Conventional lifting hooks require complex arm and wrist motions to attach and detach from carabiners, increasing the burden on workers, especially in unstable conditions.
Innovation Solution
A lifting hook design featuring an inner leg and an outer leg with a height difference, forming a three-dimensional shape, allowing for simplified attachment and detachment by moving the work tool in up-down and left-right directions without excessive wrist twisting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lifting hooks are used, then the work tool can be linked to the worker's body, but complex arm and wrist motions are required for attachment and detachment
Solution Approach 1:
The lifting hook is designed with a three-dimensional structure where the inner leg and outer leg are positioned at different heights, creating a spatial configuration that aligns with the natural posture of the worker holding the work tool. This dimensional arrangement allows the hook to engage with the carabiner gate lever through simple up-down and left-right motions rather than requiring complex wrist twisting, thereby resolving the contradiction between reliable linking and ease of operation.
2Ease of operation
If the lifting hook is positioned in natural posture, then wrist twisting is minimized, but the hook structure becomes three-dimensional
Solution Approach 1:
The lifting hook is segmented into two distinct legs: an inner leg and an outer leg, which are fixed to the work tool at different positions. This segmentation allows each leg to serve a specific function in the engagement process while maintaining a compact overall structure. The segmented design achieves the three-dimensional configuration needed for natural posture operation without creating excessive structural complexity.
3Ease of operation
If the inner leg and outer leg have height difference, then attachment motion is simplified, but the hook occupies more space
Solution Approach 1:
The height difference between the inner leg and outer leg is applied locally at the engagement points rather than uniformly throughout the entire hook structure. This localized quality change allows the hook to achieve simplified attachment motion through vertical and lateral movements while minimizing the overall volume increase, as the three-dimensional configuration is concentrated at the functional engagement area rather than extending throughout the entire device.
Data Source
AI summary
A lifting hook 100 (200, 250, 260, 270) has an inner leg 102, an outer leg 104, and a connecting part 106 connecting these legs. With respect to a worker equipped with a lever type carabiner 2(4), the inner leg 102 is located on the inner side close to the carabiner 2(4), and the outer leg 104 is located on the outer side far from the carabiner 2(4). The inner leg 102 and the outer leg 104 relatively have a height difference, and at least a portion 104main of the outer leg 104 is located higher than the inner leg 102.