Adjustable Torque Cam Disc for Swing Leaf Operators
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Solution Overview
Problem
Conventional swing leaf operators with cam mechanisms require separate configurations for different modes of operation, such as slide channel and standard arm assembly, leading to inconsistent torque curves and high manufacturing costs, especially when adapting for fire protection functions.
Innovation Solution
A swing leaf operator design that allows for adjustable torque curves using a torsion-resistant cam disc with a pressure roller path that bypasses the axial center, enabling identical or similar torque characteristics across different modes of operation, and the ability to modify torque progression and magnitude, using a drive motor and adjustable pressure roller position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate cam disc configurations are used for different modes of operation (slide channel and standard arm assembly), then torque curves can be optimized for each mode, but manufacturing costs increase and device complexity increases
Solution Approach 1:
The patent applies universality by designing a single cam disc with a specifically configured running surface that can accommodate both slide channel and standard arm assembly operations. The running surface is shaped to generate appropriate torque curves for different modes of operation without requiring separate cam disc configurations, thereby reducing manufacturing complexity while maintaining optimized performance for each mode
Solution Approach 2:
The patent utilizes dynamics by making the pressure roller position adjustable relative to the cam disc. This allows the system to adapt the torque characteristics dynamically by changing the pressure roller position, enabling the same cam disc to provide optimized torque curves for different modes of operation without physical reconfiguration
2Adaptability or versatility
If asymmetrical cam discs are developed for different modes of operation, then torque curves can be customized, but the progression of torque curves becomes fixed and not variable
Solution Approach 1:
The patent makes the torque curve progression variable by allowing adjustment of the pressure roller position along the cam disc circumference. This dynamic adjustment capability enables the system to modify torque curve characteristics while using the same cam disc, providing adaptability without fixing the torque progression permanently
3Force
If the initial tension of the closer spring is adjusted to modify torque at 0° opening angle, then torque can be reduced, but the final torque at maximum opening angle falls below admissible minimum torque
Solution Approach 1:
The patent introduces the pressure roller position as an intermediary parameter that mediates between the conflicting requirements of reducing initial torque at 0° opening angle while maintaining adequate final torque at maximum opening angle. By adjusting the pressure roller position on the cam disc, the system can independently optimize torque characteristics at different opening angles without being constrained by spring tension adjustments alone
4Ease of manufacture
If a single swing leaf operator is designed for multiple modes of operation, then manufacturing costs are reduced, but torque curves become inconsistent across different modes
Solution Approach 1:
The patent applies local quality by configuring the running surface of the cam disc with specific local characteristics that generate appropriate torque curves for different modes of operation. The running surface is shaped to provide optimized torque characteristics for both slide channel and standard arm assembly operations, ensuring reliable performance while using a single cam disc design
Solution Approach 2:
The patent ensures torque curve consistency across different modes by making the pressure roller position adjustable. This dynamic adjustment capability allows the system to compensate for differences between modes of operation, maintaining consistent and reliable torque characteristics while using a single cam disc design
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
Enables a single swing leaf operator to be used in various modes of operation with consistent torque characteristics, reducing manufacturing costs and allowing for adaptation to different European standards and door configurations, including fire protection functions.
Implementation Method 1
a closer spring (102) which presses the pressure roller (101) against a running surface (103) of the cam disc (103) by means of an operational connection
Implementation Method 2
a cam disc (103) which is torsion-resistantly disposed on an output shaft (104) and has a running surface (103), on which a pressure roller (101) rolls
Implementation Method 3
the pressure roller (101) rolls which is pressed against said surface by means of a closer spring (102)
Data Source
AI summary
A swing leaf operator having a closer portion. The closer portion has an output shaft, on which a cam disc is torsion-resistantly disposed, as well as a pressure roller. A closer spring presses the pressure roller against a running surface of the cam disc. The pressure roller is disposed such that, during an opening or closing of a swing leaf coupled to the output shaft, the pressure roller is moved along a path. The path bypasses the axial center of the output shaft and on account of the configuration of the running surface of the cam disc, in different modes of operation of the swing leaf operator at a respective opening angle of the swing leaf, a very similar or identical torque is respectively applied to the output shaft. The swing leaf operator has a drive motor in operational connection with the output shaft.