Recessed Trailer Door Handle Structure for Secure Cold-Chain Access
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Solution Overview
Problem
Conventional door handles for refrigerated trailers are large, heavy, and protruding, causing potential damage when doors are opened and are difficult for operators to use, leading to ergonomic issues and increased risk of theft due to ease of operation.
Innovation Solution
The implementation of an automotive-style handle and locking mechanism mounted to a housing encapsulated within a foamed plastic core between fiberglass reinforced plastic door pan and sheet, providing a lightweight, flush, and easily operable door solution with enhanced security features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional door handles are provided partway up the door and extend outwardly, then the locking function is achieved, but the handles may bear against the body causing damage and are difficult for operators to use
Solution Approach 1:
The handle and locking mechanism are extracted from the conventional protruding position and integrated into the door panel surface. The recessed design allows the handle to be taken out from the problematic external position and embedded within the door structure, eliminating the damage-causing protrusion while maintaining operational functionality.
Solution Approach 2:
The handle mechanism is nested within a recessed area of the door panel. The locking components are housed within the door structure rather than extending outward, creating a nested configuration where the functional elements are contained within the door's surface profile, preventing contact with the body during operation.
2Strength
If conventional door handles are made large and heavy for structural integrity, then the locking function is robust, but the handles become difficult for operators to use
Solution Approach 1:
The physical parameters of the handle are changed from large and heavy to compact and lightweight. By modifying the size and mass parameters while maintaining the locking functionality through the recessed design and internal mechanism, the handle becomes easier to operate while still providing robust locking capability.
Solution Approach 2:
The conventional heavy mechanical handle system is replaced with a lighter mechanism that utilizes the door's structural framework. The locking function is achieved through a simplified mechanical system embedded in the recess, reducing the operational weight while maintaining strength through strategic placement rather than mass.
3Temperature
If the door structure is made thicker to enhance insulating properties, then the thermal insulation is improved, but the door weight and complexity increase
Solution Approach 1:
The door utilizes composite construction with insulating materials integrated into the door panel structure. Rather than simply increasing thickness, composite materials provide enhanced thermal insulation performance while managing weight through material selection and layered construction, allowing the recessed handle to be integrated without excessive weight gain.
Data Source
AI summary
A door for a refrigerated trailer including a door pan formed of fiberglass reinforced plastic, the door pan having an inner surface and an outer surface. A door sheet is formed of fiberglass reinforced plastic and has an inner surface and an outer surface. A foamed plastic core is provided between the inner surfaces of the door pan and the door sheet. A housing is mounted between the inner surfaces of the door pan and the door sheet and is substantially encapsulated within the foamed plastic core. An automotive-style handle and locking mechanism is mounted to the housing.