Top-Hung Merchandiser Door Assembly With Adjustable Rollers
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Solution Overview
Problem
Existing sliding door systems for glass fronted display cabinets, such as those for beverages and food products, face issues with friction and slippage, particularly with pulley systems, and lack the combination of features like a top hung design, metal stiffening members, and adjustable wheel systems found in the proposed solution.
Innovation Solution
A top hung door system with an upper mounting system featuring an upper track member with depending flanges and wheel mounting portions, paired with a lower guidance system, including rollers and auxiliary track members, which provide a frictionless motion and secure attachment to the door frame, utilizing a combination of plastic and metal components for stability and adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a pulley system is used for door support, then the door can move freely, but the sash-line tends to slip off the pulleys causing reliability issues
Solution Approach 1:
A guide tube is introduced as an intermediary component between the pulley and the door. The guide tube receives the sash-line and directs it through two 90° turns to the weight, preventing the line from slipping off the pulley while still allowing smooth door motion. This mediator component resolves the contradiction by maintaining both reliability and ease of operation.
2Reliability
If a double bent guide tube is used to prevent slippage, then the sash-line is retained reliably, but the friction increases compared to a pulley system
Solution Approach 1:
The guide tube is designed with specific geometric parameters (two 90° bends) that change the direction of the sash-line while minimizing friction. The smooth internal surface and optimized bend angles reduce energy loss compared to traditional pulley systems, resolving the contradiction between reliability and energy efficiency.
3Device complexity
If a top hung door system is used, then the door structure is simplified, but the door lacks stability and proper guidance
Solution Approach 1:
The door system is segmented into distinct functional components: an upper support system with a guide tube for stability and guidance, and a lower guide member for additional support. This segmentation allows the top hung design to maintain simplicity while achieving proper stability and guidance through distributed support points.
4Adaptability or versatility
If glass panels are used for the door front, then the display function is improved, but the door frame requires additional stiffening
Solution Approach 1:
The door frame uses composite construction combining glass panels for the display function with metal stiffening members (such as angle iron or channel iron) embedded in or attached to the frame. This composite approach allows the glass to provide transparency and display versatility while the metal components provide the necessary structural strength and rigidity.
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 top hung door system offers improved stability, reduced friction, and easy installation, ensuring smooth operation and air sealing, while the metal stiffening member enhances structural integrity and the adjustable features allow for precise alignment and sealing, overcoming the limitations of prior art systems.
Implementation Method 1
The present invention overcomes the disadvantages of the known prior art systems... providing a top hung door which has an upper mounting used in conjunction with a lower guidance system... paired with a lower guidance system, including rollers and auxiliary track members, which provide a frictionless motion
Data Source
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.