Toggle Latch for Mechanical Mast Locking
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Solution Overview
Problem
Current telescoping mast locking systems are noisy, require manual intervention or external power, and fail to effectively stabilize payloads against rotational and deflection movements due to clearance issues, which are exacerbated by environmental conditions and external forces like wind.
Innovation Solution
An automatic locking system driven by the mast's extension and retraction mechanism, featuring a latch assembly with a toggle mechanism and pawl that automatically transitions between locked and unlocked positions, reducing noise and stabilizing the mast by restricting axial and rotational movements without external power or manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional locks or latches are used to lock tube sections, then the mast can be locked in extended position, but the locking system becomes noisy and may require external power or manual intervention
Solution Approach 1:
The latch mechanism is designed to automatically engage and disengage based on the relative movement between tube sections during extension and retraction. The pawl and ratchet geometry allows the latch to self-lock when tubes are extended and self-unlock when tubes are retracted, eliminating the need for external power sources or manual intervention while maintaining reliable locking.
2Adaptability or versatility
If clearance is maintained between tube surfaces to prevent binding under environmental conditions, then the mast can operate in various environments, but rotational and deflection movements increase
Solution Approach 1:
The latch mechanism divides the stabilization function into discrete engagement points along the tube sections. By distributing multiple latch engagement points, the system provides stable locking while allowing the necessary clearance between tube surfaces for environmental adaptability. Each latch segment independently contributes to overall mast stability.
3Use of energy by moving object
If automatic locking is implemented without external power, then the system simplifies power requirements, but the locking mechanism may require larger space or more complex design
Solution Approach 1:
The patent replaces complex powered locking mechanisms with a purely mechanical latch system based on pawl-ratchet geometry. The locking action is achieved through mechanical advantage in the latch arm and pawl design, eliminating motors, sensors, and control electronics while maintaining automatic operation through the inherent mechanics of tube extension and retraction movements.
4Stability of the object's composition
If tube sections maintain substantial overlap to limit deflection, then the mast stability improves, but the extended length and operational range are reduced
Solution Approach 1:
The latch mechanism engages at predetermined positions along the tube sections during the extension process. By pre-positioning the latch engagement points and using the mechanical advantage of the latch arm geometry, the system achieves stable locking with minimal overlap between tubes, maximizing the extended length while maintaining sufficient stability through the mechanical locking action.
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 system provides smooth, quiet operation, reduces inherent rotation and deflection, and maintains stability within the existing mast footprint, ensuring reliable payload alignment and reducing noise and power requirements.
Implementation Method 1
The toggle mechanism is movable between an over-center locked configuration corresponding to the engaged position of the latch mechanism and an unlocked configuration corresponding to the disengaged position of the latch member
Data Source
Figure 1A
Figure 1B
Figure 2~3
AI summary
An automatic locking system is provided that is driven by the normal extension and retraction of the mast, reduces the inherent rotation and deflection of the mast due to clearances, and operates more smoothly and quietly than conventional locking systems. The locking system also fits reasonably within the existing footprint of a typical mechanical mast.