Nested Access Door Lock Assembly for Tamper-Resistant Pass-Throughs
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Solution Overview
Problem
Existing access opening closure devices for prisons and hospital psychiatric wards are susceptible to tampering by inmates or patients, which can disable or reduce their effectiveness in preventing exposure of guards or attendants to potential injury.
Innovation Solution
The access opening closure device incorporates a housing assembly with a slide assembly, a cover lock, and a tamper-proof shroud. The slide assembly includes a frame and an access door that is movable between closed and open positions, with a stabilizing member that secures the housing assembly in an operative position. The cover lock and shroud enhance security by obstructing access to the lock components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a simple access opening closure device is used, then ease of operation is improved, but reliability is worsened due to susceptibility to tampering
Solution Approach 1:
The patent implements a nested structure where the housing assembly contains a receptacle with a cover, which in turn contains a lock mechanism. The slide assembly is integrated within the housing assembly, creating multiple layers of protection. This nesting ensures that even if one component is accessed, the inner components remain protected, thereby maintaining reliability while keeping the overall operation simple through hierarchical organization.
Solution Approach 2:
The patent introduces a cover as an intermediary component between the receptacle opening and the lock mechanism. The cover lock requires the cover to be opened first before the lock can be accessed, creating an intermediate step that prevents direct tampering. This intermediary structure maintains reliability by adding a protective layer without significantly complicating the ease of operation, as the cover can be easily opened for legitimate access.
2Reliability
If a secure lock mechanism is used, then reliability is improved, but device complexity is worsened
Solution Approach 1:
The patent combines the cover and lock mechanism into a single integrated assembly where the cover lock serves both protective and locking functions. The shroud is integrated with the cover to provide both structural support and tamper protection. This merging reduces device complexity by eliminating separate components while maintaining reliability through the combined functionality of the integrated assembly.
Solution Approach 2:
The cover serves multiple functions: it protects the lock mechanism from tampering, provides a mounting surface for the shroud, and acts as a structural element of the housing assembly. The shroud simultaneously provides structural support and obstructs access to the lock components. This multi-functionality reduces device complexity by having single components perform multiple roles while maintaining high reliability.
3Ease of operation
If lock components are exposed, then ease of operation is improved, but object-generated harmful factors are worsened due to tampering risk
Solution Approach 1:
The patent applies preliminary anti-action by positioning the shroud to obstruct access to the lock components before any tampering can occur. The cover must be opened first, which triggers the need to unlock the cover lock, creating a preliminary security barrier. This preliminary anti-action prevents direct contact with the lock mechanism, eliminating the harmful factor of tampering while maintaining ease of operation for legitimate access through the defined unlocking sequence.
Data Source
AI summary
An access opening closure device is provided for enabling passage of food or medication into a confined space without providing direct access from within the confined space to outside of the confined space. The device includes a housing assembly including a body and a cover, and a slide assembly including an access door and a frame. The body defines a receptacle and first and second openings. The housing assembly is pivotally coupled to the slide assembly and is movable from an operative position to a stowed, non-operative position.