Hoisting Device Strap Release Mechanism
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Solution Overview
Problem
Existing hoisting devices require human intervention to unhook straps from hooks, posing safety risks and inefficiencies, especially when loading heavy materials onto uneven or elevated surfaces like roofs.
Innovation Solution
A hoisting device equipped with pivoting release arms and a deflector mechanism that automatically releases straps from hooks after a load is placed on a support surface, allowing the device to operate without human intervention on the roof.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a worker manually removes straps from hooks, then the straps can be properly released, but worker safety is compromised and labor costs increase
Solution Approach 1:
The hoisting device automatically releases the straps through a self-service mechanism. The release arm pivots about a pivot axis and uses a deflector to automatically disengage the strap from the hook without requiring human intervention, allowing the system to service itself
Solution Approach 2:
A deflector acts as an intermediary element between the release arm and the strap. The deflector is positioned to contact the strap and guide it away from the hook during the release process, facilitating automatic separation without direct human contact
2Device complexity
If manual strap removal is required, then simple hook design suffices, but productivity decreases and labor costs increase
Solution Approach 1:
The release arm is designed to pivot dynamically about a pivot axis during the unloading process. This dynamic movement allows the release arm to automatically transition from a loaded position to a release position, enabling automatic strap release without complex manual operations
Solution Approach 2:
The release mechanism is segmented into distinct functional components: the release arm that pivots, the deflector that guides the strap, and the hook that holds the strap. This segmentation allows each component to perform its specific function efficiently while working together to achieve automatic release
3Ease of operation
If workers are deployed to rooftop locations, then strap release can be performed, but safety risks and labor costs increase
Solution Approach 1:
The hoisting device performs the strap release operation autonomously through self-service automation. The pivoting release arm and deflector mechanism automatically disengage the strap from the hook without requiring any worker to be present on the rooftop, achieving full automation of the release function
Data Source
AI summary
A hoist or hoisting device is configure to place a pallet on a roof without the need of a person on the roof. The hoist includes a deflector that moves between a first position and a second position and releases a strap from an open hook as the deflector moves from the first position. A release arm on the deflector contacts a portion of the strap to push the strap off the open hook after the pallet has contacted the roof. The hoist may then be raised and the strap be unthreaded and pulled upward through the pallet to leave the pallet installed on the roof.