Bidirectional Drive Shaft for Rotary Wing Emergency Actuation
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Solution Overview
Problem
Existing drive arrangements for rotating leaves are not universally applicable and require multiple configurations for different applications, such as fire protection and escape doors, leading to the need for various drive arrangements to be kept available.
Innovation Solution
A drive arrangement that allows the drive shaft to be moved in both directions of rotation by the drive motor, enabling a switchover between normal and inverse operation, and allowing the spring-loaded drive to be charged independently of the output shaft position, facilitating universal use in fire protection and escape doors with minimal conversion effort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single-direction gear mechanism is used to connect the drive motor and spring-loaded actuator, then the drive arrangement can reliably close fire protection doors, but it cannot be used for escape doors that require opening in emergency
Solution Approach 1:
The drive arrangement is designed to perform multiple functions by enabling bidirectional operation. The drive motor can rotate the drive shaft in both directions, allowing the same mechanism to close fire protection doors (normal operation) and open escape doors (emergency operation), eliminating the need for separate drive arrangements for different door types
Solution Approach 2:
The gear mechanism is designed to allow reversible rotation direction. The drive motor can switch between rotating the drive shaft in the first direction (normal operation) and the second direction (emergency operation), providing dynamic adaptability for different operational modes and door types
2Ease of operation
If the spring-loaded actuator is constantly connected to the drive shaft, then it can automatically close escape doors after power failure, but it cannot be charged independently of the drive shaft position
Solution Approach 1:
The spring-loaded actuator is pre-charged during normal operation when the drive motor rotates the drive shaft in the first direction. This preliminary charging action ensures that the actuator is ready for emergency operation without requiring additional charging mechanisms or complex coupling systems
Solution Approach 2:
The constant connection between the drive shaft and spring-loaded actuator serves multiple purposes: it allows the actuator to be charged during normal operation, maintains automatic closing capability for escape doors after power failure, and enables emergency opening when the drive motor reverses direction, eliminating the need for separate coupling mechanisms
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 the drive arrangement to be used in both fire protection and escape doors without significant changes, ensuring reliable emergency operation and efficient switching between motor-driven and spring-loaded modes, with the possibility of manual or automatic control.
Implementation Method 1
a spring-loaded drive with a helical compression spring, the helical compression spring being tensioned by the drive motor during the opening movement and the spring-loaded drive being charged as a result
Implementation Method 2
The swing leaf is opened by means of an electric drive motor
Implementation Method 3
The compression spring and the drive motor are constantly operatively connected via a gear mechanism
Data Source
Figure 1~2
AI summary
The invention relates to a drive arrangement for a rotary wing, comprising a drive shaft that is driven by a motor in the opening direction and in the closing direction with reversal of rotation, wherein it can be moved in one direction of rotation by a drive motor and in the opposite direction of rotation by a spring-loaded actuator via an interposed gearbox. In order to enable broader use of the drive arrangement for rotary wings without functional impairment of the emergency operation function by the spring-loaded actuator, the drive shaft of the rotary wing can be driven by a drive motor in both directions of rotation.