Rail Fastening Guide Plate Stop Mechanism
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Solution Overview
Problem
Existing rail fastening systems experience unintended changes in the position of the spring element and adapter piece under practical loads, hindering assembly, as they lack effective means to maintain the pre-assembly position until final assembly.
Innovation Solution
The guide plate design includes a sliding surface with a stop, causing the adapter piece to be pressed against the stop by the spring element's hold-down force, requiring an external force to move it into the assembly position, thus securing the adapter and spring element in the pre-assembly position until final assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the adapter piece is freely movable on the guide plate, then assembly is simple and fast, but the position of the spring element and adapter piece changes unintentionally under practical loads
Solution Approach 1:
The adapter piece is pre-assembled on the guide plate in a predetermined position before final installation. The sliding surface with stop mechanism maintains this pre-assembly position stable under practical loads, preventing unintentional position changes while allowing simple initial assembly without complex fastening components.
Solution Approach 2:
The sliding surface acts as an intermediary mechanism between the adapter piece and the guide plate. It provides controlled movement resistance through friction and geometric constraints, allowing the adapter piece to be positioned stably during operation while still enabling final assembly when force is applied.
2Reliability
If additional components are added to secure the adapter piece position, then position stability is improved, but device complexity increases
Solution Approach 1:
The positioning function is merged into the guide plate structure itself through the sliding surface with stop. This eliminates the need for separate positioning components such as clips, screws, or locking mechanisms, maintaining position stability while avoiding increased device complexity.
Solution Approach 2:
The guide plate serves multiple functions: it provides the sliding surface for controlled movement, the stop for position limitation, and the structural support for the spring element. This multi-functionality eliminates the need for additional dedicated positioning components.
3Reliability
If the sliding surface is made steep, then the adapter piece is held more securely in pre-assembly position, but the force required for final assembly increases
Solution Approach 1:
The sliding surface angle is optimized to provide different mechanical characteristics during different phases: during normal operation it provides sufficient friction and geometric constraint to hold the adapter piece securely, while during final assembly when external force is applied, the adapter piece can overcome the friction and geometric constraints to move to the final position.
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 ensures the adapter piece and spring element remain in the pre-assembly position without additional components or altering the assembly process, maintaining stability under practical loads and allowing for adjustable hold-down force and height compensation.
Implementation Method 1
the spring element's hold-down force
Data Source
Figure 1
Figure 2
Figure 3~5
AI summary
System for fastening a rail to a substrate (U) and a guide plate (7, 8) intended for such a system (1). The system comprises a spring element (9, 10) that can be clamped against the substrate (U) by means of a clamping element (15, 16) and has at least one spring arm (48, 49), an adapter piece (11-14) with a contact surface section (58-60) that is seated on an end section of the spring arm (48, 49), and a guide plate (7, 8). The guide plate has a contact surface (42) for the tread (F) and a sliding surface (56, 57) adjacent to the contact surface (42), via which the adapter piece (11-14) can be slid from a pre-assembly position, in which its contact surface section (58-60) rests on the guide plate (7, 8), to an assembly position, in which its contact surface section (58-60) rests on the tread (F) of the rail (S) to be fastened. The sliding surface (56, 57) of the guide plate (7, 8) rises towards the contact surface (42).Additionally, a stop (54,55) is provided on the sliding surface (56,57) against which the adapter piece (11-14) rests in the pre-assembly position.