Clamshell Bin Lid with Arch Panels and Counterweight
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Solution Overview
Problem
Conventional roll-off bin lids face safety hazards and wind exposure issues, and their design limits the maximum bin width due to the need for wind resistance and regulatory compliance.
Innovation Solution
A clamshell lid assembly with independently operable panels that lie alongside the bin sidewalls when open, using a track and pivot arm mechanism with counterweighting for easy operation and reduced wind exposure, and an arch lid design that covers the bin roof opening, allowing for increased bin width and reduced wind load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional hinged lids are used for roll-off bins, then the lid can be opened and closed, but the lid projects above the bin walls when open and is exposed to wind forces, requiring heavier and costlier design
Solution Approach 1:
The lid is divided into two separate panels that can operate independently. Each panel is hinged to a different side of the bin, allowing one panel to remain closed while the other is opened. This segmentation reduces the wind exposure area compared to a single large lid, and enables safer operation where one panel can stay closed to block wind forces during partial access operations.
Solution Approach 2:
The lid panels are designed to pivot not only horizontally but also tilt downward along inclined hinge axes. This dimensional change allows the open panels to assume a lower profile position that reduces their exposure to wind forces while maintaining accessibility. The panels can be positioned at various angles between fully closed and fully open states, optimizing both access and wind resistance.
2Ease of operation
If conventional hinged lids with winch or hydraulic mechanisms are used, then opening and closing is facilitated, but safety hazards exist in case of component failure causing uncontrolled closing
Solution Approach 1:
Counterweight springs are integrated into the hinge mechanism of each lid panel. These springs are pre-loaded to provide a closing force that balances the weight of the lid panel. When the manual crank is released or fails, the springs gradually lower the panel to a safe position rather than allowing uncontrolled slamming. This passive safety mechanism requires no external power source and cannot fail due to power loss.
Solution Approach 2:
The hinge mechanism incorporates shock-absorbing elements and controlled-release features that prevent sudden uncontrolled closing. The counterweight springs are designed to progressively release their stored energy, cushioning the closing action. Additionally, the hinge includes mechanical stops and guide features that ensure the panel follows a controlled path during closing, preventing accidental damage or injury from rapid closure.
3Ease of operation
If rolling lids with tracks extending beyond bin sidewalls are used, then the lid can be opened fully, but the overall bin width must be greater than the width of the bin itself, reducing volumetric capacity
Solution Approach 1:
The lid is segmented into two panels, each hinged to a different side of the bin. This allows each panel to be opened independently without requiring tracks that extend beyond the bin walls. The panels pivot on hinges mounted within or near the bin sidewalls, eliminating the need for external track structures that would increase the overall width and reduce volumetric capacity.
Solution Approach 2:
Instead of having the lid roll outward on external tracks as in conventional designs, the lid panels are inverted in their motion path. They pivot on internal hinges and can tilt downward along inclined axes, allowing the open panels to be positioned alongside or below the bin level rather than extending outward. This inverts the traditional rolling lid concept while achieving full opening capability without increasing bin width.
4Strength
If hinged lids are designed to withstand strong wind forces, then structural integrity is maintained, but the lids become heavier and costlier
Solution Approach 1:
The lid is divided into two smaller panels rather than one large panel. This segmentation reduces the surface area of each individual panel exposed to wind forces, allowing each panel to be constructed with less material and lower weight while maintaining adequate wind resistance. The smaller panels are easier to manage and require less structural reinforcement compared to a single large lid designed for the same total area.
Solution Approach 2:
The lid panels are designed with the ability to tilt downward along inclined hinge axes, changing their spatial orientation when opened. This dimensional change allows the panels to assume a lower profile position that reduces their effective wind exposure area. The inclined hinge mechanism enables the panels to be positioned at optimal angles that minimize wind forces while maintaining structural integrity with lighter construction.
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 clamshell and arch lid designs enhance safety by eliminating uncontrolled lid closure risks, minimize wind exposure, and maximize bin width within regulatory limits, providing efficient operation and structural integrity.
Implementation Method 1
a counterweight mechanism including a spring engaged between the bin structure and the pivot arm such that rotation of the pivot arm in the lid-opening direction winds the spring, and rotation of the pivot arm in the lid-closing direction unwinds the spring
Implementation Method 2
a counterweight mechanism including a spring engaged between the bin structure and the pivot arm such that rotation of the pivot arm in the lid-opening direction winds the spring, and rotation of the pivot arm in the lid-closing direction unwinds the spring
Data Source
AI summary
A lid assembly for a rectilinear bin includes two lid panels independently movably mounted to the bin such that when the lid assembly is in a fully-closed position, inner longitudinal edges of the panels abut each other so as to give the closed lid assembly an arched configuration. In the open position, each lid panel lies vertically along the exterior of a corresponding bin sidewall. Each lid panel is movable along tracks provided in the bin structure longitudinally outboard of the lid assembly by means of track wheels provided at each end of the panel's inner longitudinal edge. Each lid panel is movable between its open and closed positions by means of actuating arms each pivotably mounted at one end to the panel's outer longitudinal edge, and rigidly mounted at the other end to a rotatable horizontal lid actuation shaft mounted on the exterior of a corresponding bin sidewall.