Safety Switch Assembly for Waste Collection Vehicles
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Solution Overview
Problem
The existing safety switching arrangements for waste collection vehicles do not adequately prevent accidental activation of acknowledgment switches by operators, leading to potential injuries during the emptying process of garbage containers.
Innovation Solution
A safety switching arrangement with a second acknowledgment switch positioned at a distance from the first switch, combined with a pivoting lever and inductive proximity sensor, ensures that both switches cannot be unintentionally activated simultaneously, thereby aborting the emptying cycle and preventing operator injury.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single acknowledgment switch is used to detect waste container engagement, then the device complexity is reduced, but the safety of operating personnel deteriorates due to risk of accidental activation
Solution Approach 1:
The single acknowledgment switch is segmented into two spatially separated acknowledgment switches (first and second) positioned at different locations along the receptacle. This segmentation ensures that accidental activation of one switch does not trigger the emptying cycle, thereby improving safety while maintaining manageable device complexity
Solution Approach 2:
A control unit is introduced as an intermediary that receives signals from both acknowledgment switches and the flap switch. The control unit implements logic that requires simultaneous activation of both acknowledgment switches along with the flap switch to proceed with emptying, providing an additional layer of safety through intelligent mediation
2Ease of operation
If the receptacle teeth are positioned close together, then the engagement with waste container is more compact, but the safety deteriorates due to increased risk of simultaneous accidental activation of both switches
Solution Approach 1:
The two acknowledgment switches are positioned at different spatial locations along the receptacle structure, utilizing the longitudinal dimension of the receptacle to separate the switches. This dimensional separation ensures that even when the receptacle is compact, the switches remain sufficiently distant from each other to prevent simultaneous accidental activation by an operator's clothing or accessories
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
This design significantly reduces the risk of accidental switch activation, ensuring operator safety by requiring simultaneous activation of both switches for the emptying cycle to proceed, thus preventing potential injuries.
Implementation Method 1
The first and/or the second acknowledgment switch has a lever which is actuated as soon as the teeth engage with the casing of the waste container, so that at least a section of the lever is pivoted into the detection range of a proximity sensor. The proximity sensor is preferably an inductive proximity switch.
Data Source
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AI summary
The invention relates to a safety switching arrangement for a lifting and tilting device with a lifting trolley, comprising a receptacle (1, 1a) for waste containers (22) with a plurality of upwardly projecting teeth (2, 3, 4, 5) spaced apart from one another in a direction E, with at least one flap switch (10) which is switched when a waste container (22) approaches, and a first acknowledgment switch (11) which is switched when the teeth (2, 3, 4, 5) are engaged with corresponding sleeves (23) of the waste container (22), wherein a second acknowledgment switch (12) is provided which is spaced apart from the first acknowledgment switch (11) in the direction E.