Rotating Rail Foot Holder for Elevator Shaft Tolerance Compensation
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Solution Overview
Problem
Elevator rail systems face challenges in accommodating building height changes due to settlement and temperature variations, leading to relative movement between the rails and the building, which requires adjustable fastening solutions to prevent deformations and ensure secure attachment.
Innovation Solution
A rail foot holder with a contact body and holding device that allows for adjustable fastening, enabling rotation to compensate for tolerances and prevent movement or twisting, allowing for play-free and force-free attachment without disassembly, using a holding head that can be adjusted relative to the rail foot and fixed with a screw, and featuring a friction-reduced coating for smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the building height changes due to settlement and temperature variations, then the relative position between the rail and building changes, but this causes deformation in rail sections between fixing points
Solution Approach 1:
The holding device incorporates a rotatable holding head that can be adjusted to different angular positions, transforming a static fastening system into a dynamic one that adapts to varying rail foot thicknesses. This rotational degree of freedom allows the holding dimension to be modified without disassembly, enabling the system to accommodate building height changes while maintaining rail section stability
Solution Approach 2:
The invention changes the geometric parameter of the holding dimension by rotating the holding head about its axis. This parameter modification allows compensation for tolerances in the rail foot thickness, enabling the fastening system to adapt to building height variations caused by settlement and temperature changes while preventing deformation of rail sections
2Adaptability or versatility
If the holding dimension is adjusted to compensate for tolerances, then the fastening becomes adaptable to different rail foot thicknesses, but this increases the complexity of the fastening device
Solution Approach 1:
Instead of providing multiple fixed holding devices with different dimensions, the invention uses a single holding device with a rotatable head that can dynamically adjust its holding dimension. This rotational mechanism provides continuous adjustability without requiring multiple discrete components, thereby maintaining simplicity while achieving adaptability
Solution Approach 2:
The holding head serves multiple functions: it provides mechanical support, enables adjustment through rotation, and compensates for various tolerance conditions. This multi-functionality eliminates the need for separate adjustment mechanisms or multiple holding device variants, reducing overall device complexity while achieving universal adaptability
3Ease of operation
If the holding head is rotatable to reduce the holding dimension, then the fastening becomes easier to assemble and adjust, but this may reduce the securing strength
Solution Approach 1:
The rotatable holding head provides dynamic adjustability during assembly, allowing easy accommodation of tolerance variations. Once positioned, the holding head maintains its reduced holding dimension, ensuring both ease of operation during installation and adequate securing strength during operation
Solution Approach 2:
The holding dimension is optimized by rotating the holding head to a position that reduces this dimension, thereby compensating for tolerances. This parameter change is maintained in the final assembled state, ensuring both ease of assembly and sufficient securing strength through the optimized, reduced holding dimension
Data Source
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AI summary
The invention relates to a rail foot holder (2), which is used to fasten a rail (3) of an elevator system (1) in an elevator shaft (8) and comprises a contact body (10), which can be arranged in the elevator shaft (8), and at least one holding device (31). A contact plane (17) for a rail foot (20) of the rail (3) is defined by the contact body (10). The holding device (31) has a holding head (33), wherein, in order to fasten the rail (3), a first side part (21) of the rail foot (20) can be arranged between the holding head (33) of the holding device (31) and the contact plane (17). Furthermore, in the process of fastening the rail (3), a holding dimension (H) between the holding head of the holding device (31) and the contact plane (17) can be changed in order to compensate tolerances of the first side part (21) of the rail foot (20). The holding head (33) of the holding device (31) can be rotated about an axis of rotation (35) of the holding device (31) in a direction of rotation (52) into a fastening position in order to reduce the holding dimension (H). Furthermore, a side (51) of the holding head (33) of the holding device (31) facing the contact plane (17) is designed with a slope (s) against the direction of rotation (52) in at least one fastening region (49) extending around the axis of rotation (35) of the holding device (31) in the direction of rotation (52), in which fastening region at least indirect contact (76) between the holding head of the holding device (31) and the first side part (21) of the rail foot (20) is enabled. The invention relates to a method for fastening a rail (3) of an elevator system (1) in an elevator shaft (8), which method is performed by means of at least one such rail foot holder (2).