Central Seal Block for Lift-and-Slide Door Sealing
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Solution Overview
Problem
Lift-and-slide doors face challenges in maintaining a tight seal against wind pressure and rain, particularly at the center seal where the sliding sash's elastic seals can be worn away, leading to leaks and assembly difficulties due to frictional forces.
Innovation Solution
A center seal block system featuring an angular configuration with a base element and crossbar, injection-molded plastic parts with hollow chambers for adhesive sealing, and elastomeric cover layers to ensure a secure and durable seal, allowing for unhindered assembly and movement of the sliding sash.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an elastic seal element is arranged at the base of the central sealing profiles to improve sealing, then sealing performance is improved, but assembly becomes more difficult and frictional forces increase
Solution Approach 1:
The sealing system is divided into two separate components: a center seal block that remains stationary and provides the sealing surface, and a center seal profile attached to the sliding sash. This segmentation eliminates the need for elastic seal elements in permanent contact with the sliding sash, thereby improving assembly ease while maintaining sealing performance through the collaboration of these two components.
Solution Approach 2:
The problematic elastic seal element that causes high friction and assembly difficulties is extracted from the system. Instead, a smooth center seal block is used as the sealing surface, eliminating the source of friction while the sealing function is achieved through the form-fit connection between the center seal block and center seal profile.
2Reliability
If elastic seal elements are used at the base of central sealing profiles, then sealing is improved, but the seal material is continually worn away leading to leaks
Solution Approach 1:
The center seal profile with its elastic seal element is designed as a replaceable component that can be easily exchanged when worn. This allows the use of simpler, less durable materials in the consumable center seal profile while maintaining overall system reliability, as the expensive and durable center seal block remains in place and only needs occasional cleaning.
3Reliability
If the center seal block is made entirely of elastomeric material with bevelled flanks, then sealing is achieved through contact pressure, but leakage can occur when contact pressure or elasticity diminishes
Solution Approach 1:
The center seal block is constructed as a composite structure combining a rigid base element (providing structural stability and geometric precision) with elastomeric cover layers on the contact surfaces (providing sealing effectiveness). This composite design ensures that the sealing function is maintained through the elastomeric material's ability to deform and conform, while the rigid structure maintains its geometric integrity and positioning accuracy over time.
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 robust and leak-proof seal against wind and rain, with the adhesive bond preventing the center seal block from undermining and ensuring the sliding sash's smooth operation, while the elastomeric layers enhance the sealing effect.
Implementation Method 1
Only when the fixed sash has been swung in and is correctly positioned by axial displacement relative to the frame, is it fastened and sealed by filling adhesive and / or sealant through the filler opening into the sealing / adhesive chamber underneath.
Implementation Method 2
leakage water in the event of driving rain is safely drained from the center seal level or its penetration is prevented
Implementation Method 3
The contact surfaces on the center seal block, on which the profiles of the fixed wing are placed, each have an elastomeric cover layer. Due to the high weight of the fixed wing, it presses against the elastomeric layer and creates a good seal.
Data Source
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AI summary
A central sealing block (10; 10') for a lift-and-slide door (100) is designed for arrangement between a fixed leaf (110) and a superstructure profile (140) that raises a threshold (130). The block comprises at least a base (11; 11') extending longitudinally along the superstructure profile (140) and a crossbar (12; 12') adjoining the base (11; 11') at right angles. At least one downwardly open sealing/adhesive chamber (19.1', 19.2') is formed on an underside facing the superstructure profile (140), which has at least one filling opening (18.1', 18.2') opening upwards.