Tamper-Proof Liquid Dispenser Design for High-Security Facilities
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Solution Overview
Problem
Conventional liquid dispensers are not suitable for high-security facilities like prisons due to concerns of tampering, vandalism, and ligation, as they lack sufficient structural strength and secure access control.
Innovation Solution
A tamper- and ligation-resistant liquid dispenser design featuring a stainless steel construction with a pivoting cover that automatically locks in a closed position, incorporating a locking mechanism and structural reinforcements such as flange plates to prevent access and secure the liquid cartridge, along with a pump nozzle insert to control the dispensing stream diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional liquid dispenser is used, then ease of operation is maintained, but security against tampering and ligation is insufficient
Solution Approach 1:
The dispenser is segmented into multiple functional components: a secure housing structure, a separate liquid cartridge, a pump mechanism, and a dispensing assembly. This segmentation allows the liquid cartridge to be securely enclosed while maintaining operational functionality through the pump and dispensing components that remain accessible or operable from outside the secured area.
Solution Approach 2:
The liquid cartridge is nested within the secured housing structure, with the pump mechanism positioned to access the cartridge through controlled openings. The dispensing assembly is nested within the housing, allowing the liquid to be accessed and dispensed without requiring access to the entire internal structure, thus maintaining security while enabling operation.
2Reliability
If the liquid cartridge is entirely enclosed to prevent tampering, then security is improved, but accessibility for maintenance and restocking becomes difficult
Solution Approach 1:
The dispenser is designed with pre-configured access mechanisms including a latch system with key or combination lock that can be opened from the outside, and a pump mechanism that can be actuated through the dispensing assembly without opening the housing. This preliminary design of access paths allows maintenance and restocking to be performed without compromising the tamper-resistant enclosure.
Solution Approach 2:
The pump mechanism serves as an intermediary between the enclosed liquid cartridge and the external dispensing assembly. It allows liquid to be extracted and dispensed through a controlled opening without requiring direct access to the cartridge, thus maintaining security while enabling maintenance and operation.
3Reliability
If structural reinforcements are added to prevent ligation, then security is improved, but device complexity increases
Solution Approach 1:
Structural reinforcements such as flange plates are applied locally at critical areas where ligation could occur, such as around the dispensing opening and at connection points, rather than throughout the entire structure. This localized reinforcement provides ligation resistance while minimizing the increase in overall device complexity.
Solution Approach 2:
The housing structure incorporates composite construction with flange plates and reinforcing elements integrated into the design, creating a composite structure that provides enhanced strength and ligation resistance without significantly increasing complexity. The reinforcement elements are designed to work together with the base structure to provide security.
Data Source
AI summary
A tamper-proof and ligation-resistant apparatus for dispensing a liquid from a liquid container contained within a dispenser. The apparatus includes a back housing, a cover pivotally coupled to the back housing, a liquid cartridge coupled to the back housing, and an actuator coupled to the cover. The apparatus includes plates coupled to the cover and back housing to strength the apparatus or reduce gaps to prevent ligation. The actuator includes a dispensing hole small enough to prevent ligation. A pump nozzle insert compressibly fitted inside the pump nozzle reduces the liquid stream diameter and extends the pump nozzle so that the liquid stream passes through the dispensing hole unimpeded.