Direction Switchable Ratchet for Door Operator Mounting
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Solution Overview
Problem
Conventional door operators with hand-operated mechanisms are often incorrectly mounted, leading to operational issues during power failures, and the pull chain disk mechanism is inconvenient and rarely used, posing safety and aesthetic concerns.
Innovation Solution
A direction switchable ratchet device with paired direction restricting devices on the door operator's housing, allowing for easy mounting in either orientation and enabling operation without additional adjustments, featuring a speed reducer, electromagnetic brake, and a handle for manual operation during power failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hand-operated mechanism with pull chain disk is provided for manual operation during power failure, then the door can be manually operated, but the mechanism is rarely used and poses safety and aesthetic concerns
Solution Approach 1:
The invention extracts the ratchet function from a separate pull chain disk mechanism and integrates it directly into the brake disk of the electromagnetic brake system. This eliminates the need for a separate hand-operated mechanism while maintaining manual operation capability during power failures.
Solution Approach 2:
The invention merges the brake disk and the ratchet wheel into a single integrated component. The brake disk serves dual functions: electromagnetic braking during normal operation and manual cranking during power failure, eliminating the need for separate mechanisms.
2Ease of manufacture
If the door operator is designed to work in a specific orientation, then the mounting is simplified, but the door operator cannot be mounted at either orientation
Solution Approach 1:
The invention introduces asymmetric direction restricting devices with pawls that engage with ratchet teeth in specific directions. These devices are configured to restrict rotation in one direction while allowing rotation in the opposite direction, enabling the door operator to function correctly regardless of mounting orientation.
Solution Approach 2:
The direction restricting devices dynamically adapt to the mounting orientation through the reversible engagement of pawls with ratchet teeth. The devices allow rotation in the correct operational direction while preventing rotation in the incorrect direction, regardless of how the door operator is mounted.
3Reliability
If direction restricting devices are added to prevent incorrect mounting, then incorrect mounting is prevented, but the device complexity increases
Solution Approach 1:
The direction restricting function is merged with the existing brake disk and electromagnetic brake components. The brake disk serves as both the braking surface and the ratchet wheel, while the pawls are integrated into the base seat structure, minimizing additional components.
Solution Approach 2:
The brake disk is given multiple functions: electromagnetic braking during normal operation and manual cranking during power failure. The ratchet teeth on the brake disk provide both directional restriction and manual operation capability, reducing the need for separate components.
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
Ensures correct mounting and easy operation of the door operator in both orientations, preventing incorrect mounting and allowing for seamless manual operation during power failures without additional switches, enhancing safety and aesthetics.
Implementation Method 1
an electromagnet for retracting the brake baffle disk
Implementation Method 2
an elastic member to bias the brake baffle disk
Data Source
AI summary
A direction switchable ratchet device for a door operator is provided. The door operator includes an electric motor, an electromagnetic brake and the direction switchable ratchet device. The direction switchable ratchet device comprises a first and second direction restricting devices and a manually operable mechanism. A drive shaft of the electric motor is braked by a brake baffle disk when the electric motor is electrically de-energized and is released when the electric motor is electrically energized. The first and second direction restricting devices are provided to prevent the drive shaft from being rotated clockwise and counter-clockwise respectively by holding the brake baffle disk. In the event of power failure, the manually operable mechanism is effective to open the door once a pawl of the direction restricting device at the free side is retracted. The manually operable mechanism of the door operator is prevented from being incorrectly mounted in a cost-effective manner.