Sleeper Holder With Flexible Edge Sealing
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Solution Overview
Problem
Existing systems for connecting post profiles to sleepers with vertebral canals are inefficient in manufacturing and assembly, and often fail to provide a tight seal, especially when dealing with conventional sleepers having sloping outer tread surfaces or inner surfaces higher than the outer tread surfaces.
Innovation Solution
A system featuring a threshold holder with a flexible front edge, designed to be pressed into the vertebral canal, utilizing a one-piece injection-molded sealing lip or foam rubber seal, and assembly cams with inclined edges to ensure a seal, allowing for efficient assembly and a flush finish, which simplifies production and reduces the need for additional sealing measures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a silicone seal or permanently elastic seal is used to seal the threshold holder, then sealing is achieved, but the sealing is either very expensive or insufficient
Solution Approach 1:
The patent changes the material parameter from rigid or semi-rigid sealing materials (silicone, permanently elastic seal) to a flexible plastic material that can be injection-molded. This allows the sealing lip to be made from the same thermoplastic material as the threshold holder body, integrating the sealing function into the main component and eliminating the need for separate expensive sealing materials while maintaining effective sealing through the flexible material's ability to deform and conform to the vertebral canal geometry
Solution Approach 2:
The sealing lip is merged with the threshold holder body as a single injection-molded component. The flexible plastic sealing lip is integrally formed with the rigid holder body, combining the structural support function and the sealing function into one unified part. This eliminates the need for separate sealing components and their associated assembly steps, reducing manufacturing complexity and cost while ensuring reliable sealing
2Manufacturing precision
If the vertebral canal is removed with a precise fit or a special design is used, then connection precision is improved, but the device complexity increases
Solution Approach 1:
The patent changes the approach from modifying the vertebral canal geometry (removal, precise fitting) to modifying the sealing lip parameters (flexibility, material properties). The flexible plastic sealing lip can deform to accommodate the existing vertebral canal geometry, achieving precise sealing without requiring complex modifications to the sleeper's vertebral canal or the threshold holder's overall design
Solution Approach 2:
Instead of adapting the threshold holder to precisely fit the vertebral canal through complex design features, the patent inverts the approach by using a flexible sealing lip that adapts to the vertebral canal's existing geometry. The compliant sealing element conforms to the sleeper's features rather than requiring the threshold holder to be precisely shaped to match, thereby reducing device complexity while maintaining manufacturing precision
3Productivity
If assembly cams with inclined edges are used to press the sealing lip into the vertebral canal, then assembly efficiency is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent uses a flexible plastic material for the sealing lip that has appropriate elastic properties, allowing it to be compressed by the assembly cam and then maintain its compressed state through elastic recovery. The material's viscoelastic characteristics enable effective sealing through relatively simple cam action without requiring extremely precise control of the compression force or position, thus achieving high assembly efficiency while maintaining acceptable manufacturing precision requirements
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 achieves a tight seal and efficient assembly, allowing for uniform cutting of profiles, reducing production complexity and eliminating the need for expensive or insufficient sealing methods, while ensuring a flush finish with the threshold and post profiles.
Implementation Method 1
the front edge of the threshold holder is designed to be flexible. If the threshold holder is made of thermoplastic material using an injection molding process, this can be done, for example, by means of a one-piece injection-moulded sealing lip made of flexible plastic, for example TPE.
Implementation Method 2
an open-cell foam layer, particularly preferably a foam rubber seal, is used, which covers the underside of the sleeper holder and is guided around the front edge of the sleeper holder.
Data Source
Figure 1~2
Figure 3
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AI summary
The invention relates to a system comprising a sleeper (1), a post profile (9, 30) and a sleeper holder (10, 40), in which the sleeper (1) has an inner tread (7), an outer tread (4), which is lower than the inner tread (7), and an eddy channel (8) formed as an undercut. The sleeper holder (10, 40) has an underside (12, 46), an upper side (11, 45) and a front edge (13, 47) that corresponds to the shape of the eddy channel (8) of the sleeper (1). For efficient production and assembly and a configuration that is leakproof in particular in the region of the eddy channel, it is provided for the sleeper holder (10, 40) to have at least one assembly tappet (14, 48) on its underside (12, 46) and for the sleeper (1) to have at least one corresponding bore (15) in the region of the outer tread (4), and for the front edge (13, 47) of the sleeper holder (10, 40) to be soft and elastic. To mount the sleeper holder (10, 40), the latter is placed at an acute angle to the outer tread (4) of the sleeper (1), the soft elastic front edge (13, 47) projecting into the eddy channel (8). The sleeper holder (10, 40) is then pivoted in the direction of the outer tread (4) and the at least one assembly tappet (14, 48) is introduced into the at least one corresponding bore (15) in the outer tread (4). The soft elastic front edge (13, 47) of the sleeper holder (10, 40) is pressed into the eddy channel (8) in a sealing manner in the process.