Deformable Gripper Arms for Variable Refuse Container Handling
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Solution Overview
Problem
Existing refuse collection vehicles require manual adjustment of grabber arms to accommodate different container sizes, leading to potential damage and inefficiency, as well as increased operator risk.
Innovation Solution
A deformable gripper assembly with lattice structures that deform under threshold force, allowing for secure engagement of containers of varying sizes without manual adjustment, using deformable materials like rubber and inserts for structural support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual adjustment of grabber arm openings is used to accommodate different container sizes, then the device can handle various container dimensions, but it requires operator intervention and time for adjustment
Solution Approach 1:
The grabber arm incorporates a deformable lattice structure that dynamically changes its configuration based on applied force. When the grabber arm contacts a container, the lattice structure automatically deforms to accommodate the container's size and shape, eliminating the need for manual adjustment while maintaining adaptability across different container dimensions
Solution Approach 2:
The lattice structure's physical parameters (shape, volume, density) change in response to applied load. As force is applied during container engagement, the lattice compresses and reconfigures to match the container's geometry, enabling automatic adaptation to various container sizes without operator intervention
2Device complexity
If fixed opening size grabber arms are used, then the device structure is simpler, but it cannot accommodate different container sizes
Solution Approach 1:
The lattice structure provides a simple yet dynamic solution where the entire structure deforms in a controlled manner under load. This dynamic behavior allows a single fixed-configuration component to achieve variable adaptation, maintaining structural simplicity while enabling accommodation of different container sizes through force-induced deformation
3Force
If rigid grippers are used to securely engage containers, then the grip strength is sufficient, but containers may be crushed or damaged
Solution Approach 1:
The lattice structure acts as a flexible shell that can deform under compression. When engaging a container, the lattice compresses and conforms to the container's surface, distributing the grip force over a larger area and preventing localized crushing or damage while maintaining sufficient overall grip strength
Solution Approach 2:
The lattice structure's physical parameters change under load, allowing it to transition from a rigid-like state during approach to a compliant state during engagement. This parameter change enables the gripper to apply sufficient force for secure engagement while automatically adjusting its stiffness to prevent container damage
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
Enhances waste collection efficiency, reduces container damage, and minimizes operator risk by accommodating multiple container sizes without manual adjustments, ensuring secure grip throughout the dump cycle.
Implementation Method 1
The first deformable structure defining a first lattice with a first internal web that deforms in response to application of a threshold force on a surface of the first gripper
Data Source
AI summary
A refuse collection vehicle includes a refuse grabber assembly, a lift arm coupled to the refuse grabber assembly, and a hopper configured to receive refuse from the refuse container. The lift arm is operable to position the refuse grabber assembly. The refuse grabber assembly includes a first grabber arm and a second grabber arm that are configured to cooperate to engage the refuse container. The first grabber arm includes a first gripper and a first support arm coupled to the first gripper. The first gripper includes a first deformable structure configured to contact a first surface of a refuse container. The second grabber arm includes a second gripper and a second support arm coupled to the second gripper. The second gripper includes a second deformable structure configured to contact a second surface of the refuse container.