A top hung door assembly
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Solution Overview
Problem
Existing top hung door systems for glass fronted display cabinets, such as those for beverages and food products, face issues with slippage on pulleys and lack of frictionless motion, and none combine features like metal stiffening members, auxiliary track members, or wheel mounting brackets effectively.
Innovation Solution
A top hung mounted rolling sliding door system with an upper track member having depending flanges with wheel mounting portions, paired rollers, and auxiliary track members that include j-shaped portions for automatic centering and adjustable mounting brackets with metal stiffening for enhanced stability and sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a double bent guide tube is used to direct the sash-line through two 90° turns, then the sash-line slipping off the pulleys problem is solved, but the frictionless free motion of a pulley system is lost
Solution Approach 1:
The patent introduces an intermediary component (the double bent guide tube with integrated pulley system) that mediates between the sash-line and the door assembly. The guide tube acts as a mediator that prevents sash-line slippage while the integrated pulley system within it maintains smooth motion, resolving the contradiction between reliability and ease of operation.
Solution Approach 2:
The patent merges the guide tube function and pulley system into a single integrated component. By combining these two previously separate functions into one unified structure, the system achieves both secure sash-line retention and frictionless door motion simultaneously, eliminating the trade-off between the two requirements.
2Device complexity
If a top hung door system is used for glass fronted display cabinets, then the door support structure is simplified, but features such as metal stiffening members, auxiliary track members, and wheel mounting brackets are missing leading to friction and improper alignment
Solution Approach 1:
The patent segments the door support system into distinct functional components: the upper track member for support, the auxiliary track member for alignment guidance, and the wheel mounting brackets with metal stiffening members for secure attachment. This segmentation allows each component to perform its specific function optimally, achieving reliable alignment and sealing while maintaining relatively simple overall structure.
Solution Approach 2:
The patent employs composite construction by combining plastic track members with metal stiffening members and wheel assemblies. This composite approach leverages the advantages of both materials: the plastic provides corrosion resistance and ease of manufacturing, while the metal components provide structural strength and precision for proper door alignment and sealing.
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
The system provides smooth, frictionless motion and secure door alignment with automatic centering and adjustable features, overcoming slippage issues and enhancing air sealing and door stability.
Implementation Method 1
the guide tube does not have the relatively frictionless free motion of a pulley system such as a ball bearing pulley system
Data Source
Figure 1~1A
Figure 2
Figure 3
AI summary
This top hung door assembly (10) for a merchandiser includes a pair of doors (12, 14) each having an upper frame member (20) including a metal reinforcing member (22). An upper track member (16) is provided including depending flange members (36) and (38) each having a roller mounting portion (48). A pair of spaced wheel assemblies (60) is provided including a bracket (50) having a lower portion (54) connected to the upper door frame and an upper portion (52) carrying a pair of rollers (60) received by the roller mounting portion (46). The upper track member (16) includes associate track members (46) having spaced notches (49) to facilitate mounting the doors. Also the flange members have flexible tips (44) facilitating the sealing and mounting of the doors.