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An 18-inch steel plate which rests on the deck running the full length of
the rails. Upon detecting an unauthorized weight on the rail (grappling
hook, boarding ladder, hooked climbing pole, grasping fingers, etc), it
raises on tracks to form a perfectly level, flush shelf on the top of the
liftgate), thereby simply lifting the unauthorized climbing
apparatus free to fall back from whence it came. It then immediately
returns to deck level to prevent the pirates from opportunistically
hooking the edge of the lift plate. To picture this, imagine one of those
trucks with a liftgate.
Wagon Wheel fence
Similar Art [AusCan531, Feb 01 2014]
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||How does it tell the difference between a grappling
hook and line being climbed by a skinny somali
pirate, and being leaned on by a somewhat larger
||by measuring the difference between the on-deck pressure and the on-rail pressure?
||I suppose it could be intergrated with some software in the
ship's security camera system, or perhaps it could simply sound
an alarm for someone to visually check that side of the ship and
if needed they can activate it manually.
||Perhaps this system can be combined with vats of boiling oil...
||//combined with vats of boiling oil...
|| very poor batter-y joke narrowly avoided
||They are probably too busy knocking out furniture, but I suppose if they had workspace on board they could double-up.