Elevator Rail Fastening Device with Dynamic Compensation
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Solution Overview
Problem
Existing fastening devices for elevator rails in tall buildings face challenges in accommodating thermal expansion and settlement, leading to uneven friction and movement restrictions, which can cause deformation and require complex assembly adjustments.
Innovation Solution
A fastening device with a compensating mechanism featuring a first and second element that can be displaced relative to each other along an adjustment direction, allowing for play-free attachment and adaptation to the rail foot's dimensions, enabling longitudinal movement while preventing lateral displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If elongated holes with upward-oriented longitudinal axes are used in support plates for guide rail clamps, then relative upward movement of guide rails during building settlement is facilitated, but friction increases in downward movement direction and prevents relative vertical movement
Solution Approach 1:
The fastening device transitions from a static connection to a dynamic system where the guide rail can move vertically relative to the support plate. The elongated hole geometry and resilient clamp design enable the system to adapt its fastening characteristics based on movement direction, facilitating upward movement while maintaining controlled downward positioning.
Solution Approach 2:
The friction characteristics of the fastening device are made variable rather than constant. The friction force changes depending on the direction of relative movement between the guide rail and support plate, allowing the system to provide different fastening behaviors for upward and downward movements, thereby resolving the contradiction between settlement accommodation and movement capability.
2Ease of operation
If guide rail clamps bear resiliently against guide rail flanges, then upward movement is facilitated, but holding force changes during bolt movement in elongated holes
Solution Approach 1:
The resilient bearing mechanism transforms the fastening system from rigid to dynamic, allowing the clamp to adapt its holding force based on the operational state. During upward movement, the resilient bearing reduces friction; during positioning, it maintains consistent holding force, thus resolving the contradiction between movement facilitation and force consistency.
3Adaptability or versatility
If multiple spacers are inserted between support plate and rail clamp to adjust play, then longitudinal displacement is permitted, but assembly complexity increases
Solution Approach 1:
The adjustment mechanism is divided into discrete spacer elements that can be individually selected and combined. This segmentation allows for precise play adjustment while maintaining relatively simple assembly procedures, as each spacer is a独立的 component that can be easily installed or removed to achieve the desired clearance.
4Reliability
If limited adjustment movements are permitted, then torsion of elevator rail occurs along longitudinal axis, but rigid fastening prevents thermal expansion accommodation
Solution Approach 1:
The fastening device provides different fastening characteristics at different locations and in different directions. Laterally, the connection is rigid to prevent torsion and maintain stability. Longitudinally, the connection is more compliant to accommodate thermal expansion and building settlement. This local differentiation of fastening quality resolves the contradiction between stability and adaptability.
Data Source
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AI summary
The invention relates to a fastening device (1), which serves to fasten one face (23) of a rail foot (22) of an elevator rail (20) relative to a fastening plane (28), comprising a support region (7) and a contact region (40), between which the face (23) of the rail foot (22) can be arranged. According to the invention, a compensation means (2) is provided. The compensation means (2) has a first element (3) and a second element (4), which can be moved relative to each other along an adjustment direction (14) serving to fasten the face (23) of the rail foot (22) of the elevator rail (20). The first element (3) and the second element (4) are designed such that, between the contact region (40) and the support region (7), a holding dimension (41), observed perpendicular to the adjustment direction (14), in which a zero-backlash fastening of one side of a rail foot is enabled between the contact region (40) and the support region (7), can be modified by a movement of the first element (3) relative to the second element (4) occurring in the adjustment direction (14). The support region (7) is designed on the first element (3). Alternatively or additionally, the support region (7) is designed on at least one protrusion (62) designed on the first element (3). The invention further relates to an elevator system having such a fastening device (1) and to a method carried out by means of such a fastening device (1).