Tote Container Handle Mechanism for Single-Lift Safety
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Solution Overview
Problem
Stacks of custom tote-style containers designed for single fork tine transport pose safety concerns due to potential rotation and tipping during lifting, as existing designs allow a fork tine to lift multiple containers, leading to instability and safety risks.
Innovation Solution
The design incorporates features such as lower blocking walls and spring-loaded handles that prevent a fork tine from lifting any but the topmost container in a stack, ensuring only the topmost container can be picked up, thereby maintaining stability and safety during transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If containers are designed with openings for single fork tine transport, then material handling flexibility is improved, but safety deteriorates due to potential rotation and tipping when stacking
Solution Approach 1:
The handle is designed to move between two positions: an upward extended position that exposes the opening for fork tine insertion, and a downward position that blocks the opening. This dynamic movement allows the same structure to serve both lifting and blocking functions, resolving the contradiction between adaptability and safety.
Solution Approach 2:
The container's own weight and the weight of stacked containers automatically force the handle into the blocking position, eliminating the need for external mechanisms or additional components. The system self-regulates based on whether it is being lifted or stacked.
2Ease of operation
If containers allow fork tine insertion through handles, then ease of operation is improved, but stability deteriorates when multiple containers are lifted
Solution Approach 1:
The handle dynamically changes position based on the stacking condition. During lifting, the handle is upward to allow fork tine insertion. During stacking, the handle moves downward to block the opening, preventing accidental lifting of stacked containers and maintaining stack stability.
Solution Approach 2:
The blocking wall and movable handle create a preliminary barrier that prevents fork tine insertion into stacked containers before lifting attempts occur. This pre-blocking action eliminates the risk of unstable multi-container lifting.
3Productivity
If containers are designed for single tine lifting, then productivity is improved, but device complexity increases to prevent stack lifting
Solution Approach 1:
The blocking function is segmented into two components: a fixed blocking wall that provides structural prevention, and a movable handle that provides conditional blocking. This segmentation allows each component to be simple while collectively achieving the safety function.
Solution Approach 2:
The movable handle provides a dynamic blocking solution that requires minimal structural complexity. Instead of complex locking mechanisms or sensors, the handle simply moves between two positions based on gravitational force from stacking, maintaining simplicity while enabling productivity.
Data Source
AI summary
A tote style container with a first handle and second handle that can be picked up by a fork tine is provided. The container includes features for blocking the tine of lower containers when in a stack of like containers.