Sliding Door Eccentric Cam Anti-Lifting Protection
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Solution Overview
Problem
Existing sliding door arrangements lack a reliable anti-jemmy device that can be activated without additional work steps after the sash is hung, and existing solutions require the rail to protrude, making them inefficient and prone to deactivation.
Innovation Solution
A sliding door arrangement with an eccentric adjustment system and a non-rotatably mounted disc as anti-lifting protection, where the disc's outer diameter limits the roller's lifting, and a reduced diameter section allows the roller to be raised for assembly, ensuring the roller cannot be lifted out of the track, and the disc automatically activates anti-lifting upon slight rotation of the eccentric axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an anti-jemmy device is added to prevent lifting of the wing, then security against unauthorized removal is improved, but device complexity increases and requires additional work steps for activation
Solution Approach 1:
The anti-jemmy protection function is merged with the eccentric adjustment mechanism. The disc is non-rotatably connected to the roller axis or bearing axis, so that a single component serves both to adjust the vertical position of the sash and to provide anti-lifting protection. This eliminates the need for separate anti-jemmy devices and reduces overall structure complexity.
Solution Approach 2:
The anti-lifting protection is preliminarily built into the roller arrangement through the disc with reduced diameter section. During the normal hanging process, when the roller is positioned in the running rail, the disc automatically limits lifting motion. No additional activation step is required - the protection is already in place as part of the installation process.
2Reliability
If the rail protrudes to allow anti-jemmy device activation, then anti-lifting protection can be engaged, but ease of operation deteriorates and the device becomes prone to deactivation
Solution Approach 1:
The disc with its reduced diameter section automatically engages with the running rail structure to provide anti-lifting protection. The system is self-activating - when the roller is positioned in the rail, the disc's geometry inherently limits lifting motion without requiring manual intervention or additional activation steps. The design makes the protection function self-executing.
3Reliability
If the disc outer diameter limits roller lifting, then security against unauthorized removal is improved, but ease of manufacture deteriorates due to precision requirements
Solution Approach 1:
The disc has two distinct diameter parameters: the outer diameter that limits lifting motion and the reduced diameter section that allows the roller to be raised during assembly. By carefully selecting these diameter parameters, the design achieves both security (limiting lifting) and ease of assembly (allowing roller insertion). The parameter change from outer diameter to reduced diameter creates the functional differentiation needed.
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 solution provides a simple, reliable anti-jemmy device that secures the sliding door against lifting, allowing for easy assembly and adjustment while preventing unauthorized removal of the roller from the track, ensuring secure operation without additional work steps.
Implementation Method 1
An eccentric adjustment is provided for setting the vertical position of the sash, with a roller axis or a bearing axis of a roller carrier and an eccentric axis arranged eccentrically thereto
Data Source
Figure 1~2b
Figure 3a~4b
Figure 5a~6b
AI summary
The arrangement (1) has a running rail (2), and a leaf (3) engaged into the rail with a roller arrangement (5) having a roller. An eccentric cam adjusting unit adjusts vertical position of the leaf. An eccentric cam axle is arranged eccentrically on a roller axle. A disk is arranged on the roller axle in a torque-proof manner as a lift protection unit for protecting lifting of the leaf from the rail. The disk limits the projection of the roller arrangement into the rail in an effective position. The roller is rotatably supported on the roller axle with a bearing.