Antenna Steering Locking Ratchet Mechanism
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Solution Overview
Problem
Current antenna steering and locking systems for cellular antennas face challenges in accurately adjusting and maintaining the azimuth position, especially under weight and wind loading conditions, which can lead to performance issues and safety concerns, particularly as multiple antennas are installed on a single mast.
Innovation Solution
A cellular antenna steering and locking apparatus featuring a toothed ratchet mechanism with a ratchet-engaging member that allows for precise adjustment and locking in specific angular positions, providing high adjustability and resistance to back-driving forces from wind, using a combination of ratchets and pawls with spring bias and actuation mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional locking mechanism is used for antenna azimuth adjustment, then the structure is simple, but the adjustment precision and stability under wind loading are insufficient
Solution Approach 1:
The locking mechanism is segmented into multiple independent pawls (at least two) that engage with a toothed ratchet. Each pawl can be independently actuated to lock or unlock the antenna assembly, allowing precise angular positioning at discrete intervals determined by the ratchet teeth while maintaining structural simplicity through modular components.
Solution Approach 2:
The locking mechanism transitions from a static locked state to a dynamic unlocked state through actuation of the pawls. The spring-loaded pawls can dynamically engage or disengage from the ratchet teeth based on actuation signals, enabling the antenna to be locked at precise angular positions during installation and maintenance while allowing movement when unlocked.
2Ease of operation
If the antenna is allowed to rotate freely for adjustment, then the ease of operation is improved, but the stability under wind and weight loads deteriorates
Solution Approach 1:
The spring-loaded pawls are pre-positioned to engage with the ratchet teeth, creating a preliminary locking action that prevents the antenna from moving under wind or weight loads. The springs provide continuous force to ensure the pawls remain engaged with the ratchet, counteracting any forces that might cause the antenna to shift from its locked position.
Solution Approach 2:
The spring-loaded pawls automatically engage with the ratchet teeth when the antenna is rotated to a desired position, providing self-locking functionality. The mechanism does not require continuous active control to maintain the locked state; once the antenna is positioned and the pawls engage, they automatically hold the position against external forces without additional energy input.
3Productivity
If multiple antennas are installed on a single mast to increase capacity, then the productivity is improved, but the weight and wind loading problems worsen
Solution Approach 1:
Each antenna is equipped with an independent locking mechanism with its own pawls and ratchet, allowing each antenna to be individually secured at its optimal azimuth position. This segmentation ensures that the weight and wind loads of multiple antennas are independently managed, preventing cumulative loading issues and allowing each antenna to contribute to network capacity without compromising structural integrity.
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
The solution enables precise and stable azimuth adjustment of cellular antennas, enhancing network coverage while ensuring safety by preventing unintended movement due to wind or weight loads, and allowing for finer resolution adjustments than traditional systems.
Implementation Method 1
a locking mechanism having a first condition in which rotation between the first and second brackets is prohibited, and a second condition in which rotation between the first and second brackets is permitted, the locking mechanism having a toothed ratchet and a ratchet-engaging member
Implementation Method 2
using a combination of ratchets and pawls with spring bias and actuation mechanisms
Data Source
AI summary
A cellular antenna steering and locking apparatus (100) has a first bracket (158) for attachment to a fixed structure, a second bracket (198) for attachment to a cellular antenna, a joint arrangement between the first and second brackets to facilitate rotation there between about a pivot axis and a locking mechanism (104) having a first condition in which rotation between the first and second brackets is prohibited, and a second condition in which rotation between the first and second brackets is permitted, the locking mechanism having a control (114) rotatable between the first and second conditions.