Sail Track Car Auto-Locking Retrofit Without Track Modification
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Solution Overview
Problem
Existing sail track systems require manual actuation of locking mechanisms, which can be unreliable and bulky, and modifying them to include automatic locking often involves costly replacements and additional mast modifications.
Innovation Solution
A retrofit apparatus for sail track cars that converts manual locking systems to automatic, using an actuator assembly with a latch element and control surface to switch between locked and unlocked configurations, allowing hoist-to-lock and hoist-to-unlock functionality without replacing the track.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual actuation of locking mechanisms is used, then the system is simpler, but the reliability and ease of operation deteriorate due to accessibility issues and user error
Solution Approach 1:
The locking mechanism automatically engages and disengages based on the hoisting motion itself. The car's movement along the track during hoisting automatically actuates the locking mechanism through the existing trip line arrangement, eliminating the need for manual intervention while maintaining system simplicity
Solution Approach 2:
Instead of manually activating the lock, the system inverts the approach by allowing the hoisting motion itself to trigger the locking action automatically. The car's upward movement pulls the trip line, which automatically engages the pawl with the track seat, reversing the conventional manual activation sequence
2Strength
If load bearing components pivot through a large angle to lock and unlock, then the locking mechanism is more robust, but the device size and bulk increase
Solution Approach 1:
The system uses the dynamic hoisting motion to automatically actuate the locking mechanism. The car's upward movement dynamically pulls the trip line, which in turn dynamically actuates the pawl to engage with the track seat, eliminating the need for large static component dimensions
Solution Approach 2:
The locking function is extracted as a separate automatic mechanism that operates independently of the car's main structure. The trip line and pawl form a distinct sub-system that can be compactly integrated into the car without increasing overall car volume
3Extent of automation
If the track and mast are modified to install automatic locking cars, then the locking functionality is improved, but the manufacturing cost and installation complexity increase
Solution Approach 1:
The apparatus is designed to work with existing manual locking sail track systems without requiring modifications to the track or mast. The same trip line arrangement used for manual actuation is repurposed to enable automatic locking, making the system universally compatible with existing installations
Solution Approach 2:
The automatic locking function is merged with the existing manual locking components. The trip line serves dual purposes: it can be manually pulled for manual locking or automatically pulled by the car's hoisting motion for automatic locking, combining both functions into a single integrated system
Data Source
AI summary
An apparatus (100) for actuating a locking mechanism (12) of a locking sail track car (10) comprises a latch formation (116) disposed in a fixed position with respect to the track (14), a control surface (112) spaced from the latch formation (116) in a hoisting direction, and an actuator assembly (120) for attachment to the car (10). The actuator assembly (120) comprises an actuator (124) for operating a control member (24) of the car locking mechanism, and a latch element (158) connected to the actuator (124) and moveable between a first detent position in which the latch element (158) is not engageable with the latch formation (116) and a second detent position. The latch element (158) is arranged to cooperate with the control surface (112) upon movement of the actuator assembly (120) in the hoisting direction to set the latch element (158) into the second detent position, and is engageable with the latch formation (116) upon subsequent movement of the actuator assembly (120) in a loading direction with the latch element (158) in the second detent position. Engagement of the latch element (158) with the latch formation (116) fixes the actuator (124) in position with respect to the track (14) for operating the control member (24) of the car locking mechanism (12) upon subsequent movement of the car (10) in the loading direction, and urges the latch element (158) out of the second detent position and towards the first detent position such that subsequent movement of the actuator assembly (120) in the hoisting direction to disengage the latch element (158) from the latch formation (116) sets the latch element (158) back into the first detent position.