Mechanical Safety Closure Interlock for Media Supply Containers
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Solution Overview
Problem
Current safety measures for containers with media supply lines, such as those used in the food and beverage industry, are either expensive and complex (electrically controlled) or lack protection against accidental opening (mechanically secured), posing risks from hot water or aggressive cleaning agents during manual operation.
Innovation Solution
A mechanically operable safety closure system that includes a pivoting lever with a first locking element and a second locking element coupled to a shut-off device, preventing the cover from being opened unless the shut-off device is closed, thereby acting as a splash guard to protect operators from scalding or chemical burns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrically controlled cover lock is used, then safety protection is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex electrical control systems with a purely mechanical locking mechanism. The cam-shaped locking element and corresponding cam groove create an interlocked system where the lid and shut-off device mechanically depend on each other, eliminating the need for electrical sensors, controllers, and wiring while maintaining safety functionality.
Solution Approach 2:
The mechanical locking system is self-regulating through its cam-cam groove geometry. The system automatically prevents lid opening when the shut-off device is open without requiring external control signals, power supply, or complex logic. The mechanical elements themselves provide the control function through their geometric arrangement.
2Reliability
If an electrically controlled cover lock is used, then safety protection is improved, but cost increases
Solution Approach 1:
The patent employs simple, inexpensive mechanical components such as cam-shaped elements, grooves, and spring-loaded actuators that can be manufactured using standard machining processes. These components are far less costly than electrical control systems requiring sensors, programmable logic controllers, and specialized wiring, while providing equivalent safety functionality.
3Ease of operation
If a padlock is used for mechanical security, then ease of operation is improved, but reliability against incorrect operation deteriorates
Solution Approach 1:
The patent combines the lid closure function and shut-off device function into a single integrated mechanical locking system. The cam-shaped locking element on the lid works together with the cam groove on the shut-off device, creating a unified mechanism where both functions are interdependent and cannot be operated independently, preventing incorrect operation while remaining easy to use.
Solution Approach 2:
Instead of using a padlock that relies on key authentication to prevent unauthorized opening, the patent inverts the approach by using the shut-off device position itself to control lid accessibility. The lid can only be opened when the shut-off device is in the closed position, reversing the traditional logic where the lock controls the opening regardless of other conditions.
4Ease of operation
If the lid can be opened manually, then ease of operation is improved, but safety protection deteriorates
Solution Approach 1:
The patent requires that the shut-off device be closed before the lid can be opened, as the mechanical locking elements are positioned such that the lid is blocked when the shut-off device is open. This preliminary action of closing the shut-off device ensures safety before allowing lid access, preventing harmful media discharge while maintaining manual operability.
Data Source
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AI summary
A safety closure (1, 21) for or on a container (2) with a media supply line (3) is described. The safety closure (1, 21) comprises: a lid (4), which is to be operated, in particular mechanically, for closing the container (2); a shut-off device (5) for closing the media supply line (3); a pivot lever (6, 26) with an actuating arm (6a, 26a) for pressing the lid (4) against the container and with a first locking element (6b, 26b), in particular opposite the actuating arm (6a, 26a); and a second locking element (7) coupled to the shut-off device (5) by means of a drive mechanism, which is designed as a stop (8) for the first locking element (6b, 26b) that is selectively effective when the shut-off device (5) is open, such that the lid (4) cannot be opened when the shut-off device (5) is open.This makes it easy and reliable to prevent the lid (4) from being accidentally opened while the container (2) is being dispensed.