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Sergent Engineering couplers
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[quote]QUOTE: I wonder if these will stay coupled better than Kadees and <br />the like.[/quote] <br /> <br />I found out how they work. This is from the Sergent Engineering Site FAQ. <br /> <br />[quote]QUOTE: The Sergent Engineering coupler contains perfectly round stainless steel ball within the coupler that can move up to unlock the knuckle. When the knuckle closes the ball falls and jams against a suitably tapered surface on the knuckle to lock. Positioning a handheld magnet above the couplers while slacked, will pull the ball up and unlock the knuckle. All of this occurs inside the coupler where we don’t have to worry about dust etc causing the thing to stick. Most of the headaches involved with similarly designed larger scale couplers have to do with the interaction of the pin and the spring that flips the knuckle open when it is unlocked. Since the pin isn’t solidly locked in place, its allowed to jiggle up a bit as the couplers are slacked. The knuckle spring then holds it there. The process repeats until the pin is high enough to allow the knuckle to unlock and you get a spontaneous disconnect (ugh). By using a ball, the knuckle tends to jam the ball back down as slack is taken up. By omitting the knuckle spring, intended disconnects can be accomplished with very little magnetic force.[/quote]
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