Gravity-Actuated Locking Device for Waste Containers
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Solution Overview
Problem
Conventional automatic locking devices for waste containers are bulky, expensive, and difficult to mount on variously shaped and sized containers, requiring manual operation by trash truck drivers, which increases operational costs and is inefficient due to unauthorized use.
Innovation Solution
A gravity-actuated locking device with a base unit and pivotable unit, featuring a sliding member, rolling member, pivot lever, and biasing member, that automatically unlocks when the container is tilted for dumping, allowing the lid to open and preventing unauthorized access when upright.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional chains and padlocks are used to lock the dumpster, then unauthorized use is reduced, but operating expenses increase because the driver must get out of the truck to unlock the padlock
Solution Approach 1:
The locking device automatically unlocks when the container is tilted for dumping, without requiring manual intervention from the driver. The system uses the container's own movement (tilting) to trigger the unlocking mechanism, making the system self-activating and eliminating the need for the driver to exit the vehicle.
Solution Approach 2:
The locking mechanism is pre-configured to detect the tilting motion and automatically release the lock before the dumping process begins. This preliminary automatic action ensures the lid can open smoothly without requiring subsequent manual unlocking operations.
2Ease of operation
If conventional automatic locks are used to automatically unlock when the dumpster is lifted, then manual operation is eliminated, but the devices become bulky, expensive and difficult to mount
Solution Approach 1:
The locking device is divided into separate functional components: a locking mechanism with a sliding member and rolling member, a pivotable unit that can rotate independently, and a connecting member. This segmentation allows each component to be optimized for its specific function and facilitates easier assembly and mounting on various container types.
Solution Approach 2:
The locking device incorporates dynamic elements including a pivotable unit that rotates about a pivot axis, a sliding member that moves linearly, and a rolling member that converts rotational motion into linear motion. These dynamic components enable automatic unlocking through gravity-driven motion when the container is tilted, eliminating the need for bulky static locking mechanisms.
3Device complexity
If the pivotable unit is kept close to the trash stream during dumping, then the locking mechanism is simple, but the components are damaged by impact with heavy trash items
Solution Approach 1:
The pivotable unit is positioned in a spatial dimension away from the direct path of the trash stream during dumping. By rotating the pivotable unit about a pivot axis to a predetermined angle, the mechanism achieves its unlocking function while physically separating the components from the harmful trash flow, thus preventing damage without significantly complicating the mechanism.
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 solution reduces operational costs by eliminating the need for manual unlocking, is adaptable to different container sizes and shapes, and withstands outdoor use, while preventing damage from heavy trash items during dumping.
Implementation Method 1
The rolling member is affected by gravity to be in the blocked position when the container is upright and in the unblocked position when the container is tilted past a predetermined angle
Implementation Method 2
The biasing member and the pivot lever function to keep the pivotable unit away from the trash stream when the container is in the dumping position
Data Source
AI summary
The present invention generally relates to waste containers and, more particularly, relates to a locking device for waste containers. The locking device is gravity actuated to an opened position on tilting of the container for dumping. The locking device allows the lid of the container, when the container is in an upright position, to be locked to prevent unauthorized access to the container. When the container is tilted from the upright position, e.g. to empty the contents of the container, the locking device is gravity actuated to allow the lid to open.