Spreader System Cam Mechanism for Passive Load Grasping
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Solution Overview
Problem
Current lifting beam safety systems are active and prone to human error, which can compromise the safety of both the load and operators, as they require operator participation and are susceptible to mistakes.
Innovation Solution
A spreader system with a quarter-turn device and cam guidance system that automatically engages and disengages the gripping mechanism, ensuring maximum passive safety by using a slider with teeth and a key mechanism to lock and unlock the lifting beams, and a cam system with arms and slide to securely grasp and release loads without immediate opening during impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active safety systems requiring operator participation are used, then the system can respond to safety issues, but the reliability decreases due to human error
Solution Approach 1:
The gripping system is designed to automatically engage and disengage without operator intervention. The cam mechanism self-actuates based on the relative movement between the lifting beam and spreader, eliminating the need for operator participation while maintaining safety functionality.
Solution Approach 2:
The patent replaces active mechanical safety systems requiring operator input with a passive cam-based mechanical system that automatically responds to load conditions. The cam mechanism translates relative movement into gripping force automatically, eliminating human error while maintaining safety response.
2Reliability
If automatic gripping systems are implemented, then reliability and passive safety are improved, but device complexity increases
Solution Approach 1:
The cam mechanism is designed to be dynamically activated only when needed - during engagement and disengagement phases. The cam profile is shaped to automatically provide gripping force during critical moments while remaining inactive during stable lifting operations, reducing overall system complexity while maintaining high reliability.
Solution Approach 2:
The gripping system is divided into separate functional components: the cam mechanism for engagement/disengagement, the gripping elements for load holding, and the linkage system for force transmission. This segmentation allows each component to be optimized independently, managing complexity while achieving reliable automatic operation.
3Ease of operation
If friction is minimized in the gripping system, then the ease of operation improves, but the gripping force may be reduced
Solution Approach 1:
The cam mechanism is designed with differentiated friction characteristics: low friction surfaces and lubrication in moving parts for easy operation, while maintaining high friction contact at the gripping points through cam profile design and contact surface geometry. This local differentiation allows smooth operation without sacrificing gripping force.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides enhanced passive safety by automating the gripping process, reducing the risk of human error and ensuring secure handling and release of heavy loads, while minimizing friction and ensuring complete automation of the gripping system.
Implementation Method 1
a cam system with arms and slide to securely grasp and release loads
Data Source
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AI summary
The invention relates to a lifting beam (10) including: a lower beam (11) and an upper beam (12) arranged above the lower beam; means (30) for arranging the beams in close and releasable engagement with one another; and systems (17) for grasping said load, wherein the grasping means are kept in an open position when the beams (11, 12) are in engagement with one another, and in a closed position when the engagement means are released.