Sliding Showcase Closure With Bottom-Actuated Compression Sealing
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Solution Overview
Problem
Showcases with sliding doors, especially those of large size, face challenges in achieving a strong seal without complicating the opening and closing operations, often requiring access to the upper side for actuation which can be difficult and hindered by residual compression of the sealing gasket.
Innovation Solution
The showcase design includes movable upper and lower guides with actuation means that allow the openable door to be opened and closed from the bottom, using a rack and cable system for precise and robust actuation, enabling strong seal compression without needing upper access, and mechanical transmission to ensure reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compression sealing gaskets are used to ensure a strong seal, then seal integrity is improved, but the door requires dual movement capability (sliding and approach) which complicates the operating mechanism
Solution Approach 1:
The door system is segmented into two independent functional components: a sliding door for access and a movable guide for sealing. The movable guide can independently approach the fixed case to compress the sealing gasket, while the door simply slides along the guide's path. This segmentation allows each component to perform its specific function without requiring the door to have complex dual movement capabilities.
Solution Approach 2:
The movable guide acts as an intermediary element between the door and the fixed case. Instead of the door directly compressing the seal (which would require complex approach movement), the movable guide serves as a mediator that translates the door's simple sliding motion into the necessary compression action on the sealing gasket.
2Reliability
If the upper guide is positioned close to the gasket for strong compression, then seal strength is improved, but the gasket remains compressed during sliding which hinders door operation
Solution Approach 1:
The movable guide performs the preliminary action of approaching the fixed case and compressing the sealing gasket before the door begins its sliding movement. This sequence ensures that the seal is fully engaged and compressed in advance, allowing the door to then slide freely without needing to maintain or adjust compression during its travel.
Solution Approach 2:
The system dynamically transitions between two distinct operational phases: a compression phase where the movable guide approaches the fixed case to seal, and a sliding phase where the door moves along the guide's path. This dynamic separation allows the compression force to be applied only when needed, eliminating the conflict between seal strength and sliding ease.
3Reliability
If access to the upper side is required for actuating the upper guide, then proper seal compression is achieved, but operation becomes difficult and time-consuming
Solution Approach 1:
The actuation mechanisms for both the upper and lower guides are merged into a single control interface located at the bottom of the door assembly. A single actuator simultaneously controls the movement of both guides, allowing the operator to compress both seals from one accessible location rather than requiring separate access to the upper and lower sides.
Solution Approach 2:
Instead of placing the actuation mechanism at the upper side where the sealing action occurs (which would require difficult access), the actuator is inverted and positioned at the lower, more accessible side. The actuator works through a mechanical transmission system to transmit force upward to the upper guide, reversing the conventional arrangement and making operation easy and quick.
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
This design allows for easy operation of large sliding doors with a strong seal, ensuring the door can be opened and closed without accessing the upper area, maintaining seal integrity and ease of use, even with high forces required for sealing.
Implementation Method 1
compression sealing gaskets, i.e. elastic gaskets that are compressed during the closing of the showcase, so that their elasticity exerts a thrust between a fixed case of the showcase and the openable door
Implementation Method 2
upper actuation means, adapted to move the upper guide from the extracted position to the retracted position and vice versa
Data Source
Figure 1~2
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AI summary
The showcase comprises a fixed case, an openable sliding door, closable on the fixed case, a compression sealing gasket, between the fixed case and the openable door, an upper guide and a lower guide mounted on the fixed case. The openable door is slidably mounted on the upper and lower guides, and both the upper guide and the lower guide are movable between respective extracted positions and respective retracted positions with respect to the fixed case. The showcase also comprises lower actuation means, adapted to move the lower guide from the extracted position to the retracted position and vice versa, and upper actuation means, adapted to move the upper guide from the extracted position to the retracted position and vice versa. The upper actuation means are operatively connected to the lower actuation means and/or to the lower guide, so as to move the upper guide into its extracted position when the lower guide is moved into its extracted position and to move the upper guide into its retracted position when the lower guide is moved into its retracted position. In this way, it is possible to open and close the openable door of the showcase by acting only from below, on the lower guide, without it being necessary to access the upper guide, which is moved by the movement of the lower guide thanks to the connection of the upper actuation means to the lower actuation means and/or to the lower guide.