Prison Door Pass-Through Closure with Spring Lock
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing access opening closure devices for high-security prison and hospital settings are cumbersome to operate and expose guards or hospital workers to danger when transferring articles, as they require multiple locks and can damage hinges due to the weight of trays.
Innovation Solution
A closure device with a hinged front access door and independently operable rear access gate, featuring a supplemental locking mechanism with a spring-loaded pull handle and actuation mechanism for vertical movement, allowing secure and efficient passage of articles without direct exposure to inmates or patients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple lock mechanisms are used to secure the access opening closure device, then security against inmate or patient access is improved, but the device becomes cumbersome to operate and increases the risk of operational errors
Solution Approach 1:
The closure device is divided into two independently operable components: a front access door for guard access and a rear access gate for inmate/patient access. This segmentation allows each component to have its own simplified locking mechanism while maintaining overall security through the combination of both secured components.
Solution Approach 2:
The locking mechanism uses a dynamic spring-loaded pull handle that automatically engages and disengages based on the position of the access doors. When either the front door or rear gate is opened, the spring mechanism automatically releases the corresponding lock, eliminating the need for manual lock operation during access procedures.
2Ease of operation
If the top lid hinge is positioned at the front of the pass through box, then access for placing articles is improved, but the hinge is subjected to excessive weight and stress causing damage
Solution Approach 1:
Instead of positioning the hinge at the front where it would bear the full weight of trays during insertion, the hinge is repositioned to a location where the structural support is greater and the weight distribution is more favorable, reducing stress on the hinge while maintaining operational access.
Solution Approach 2:
The hinge positioning problem is solved by changing the spatial dimension of hinge placement from the front horizontal position to a different location on the box structure, distributing the mechanical load across multiple support points and reducing the stress concentration on any single hinge.
3Ease of operation
If the top lid is opened fully to facilitate article placement, then access for placing trays is improved, but the hinge is subjected to maximum stress and movement
Solution Approach 1:
The front access door is designed to open only to the extent necessary for article placement, rather than allowing a full 180-degree opening. This partial action provides sufficient access for inserting trays while significantly reducing the stress and movement range required of the hinge 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
Enables safe and efficient transfer of articles to inmates or patients without risking injury to guards or hospital workers, reducing maintenance costs and simplifying operations by minimizing the need for complex lock mechanisms and reducing hinge strain.
Implementation Method 1
a spring-loaded pull handle that engages a lock bar affixed to the rear access gate to limit movement of the rear access gate
Data Source
AI summary
A closure device for a prison or hospital door having an access opening therethrough enables articles to be passed through the door without endangering the guard or hospital worker delivering the articles. The closure device includes a rectangular box having a top surface formed with a transparent panel, a hinged front access door, a vertically slidable rear access gate and an actuation mechanism for controlling the movement of the gate. The actuation mechanism has a pivoted actuator handle coupled to the rear gate to affect vertical movement thereof and a spring-loaded supplemental lock that requires release against a lock bar secured to the rear gate before the actuator handle can be moved. The rectangular box can have two opposing side walls or be formed with an open side that closes against a cover member secured to the door frame to close the open side of the box.