| 摘要 |
A sliding bar contains a slot on one end so that bar movement passes shackle rods of an opened padlock. The bar is positioned on a rigid arm extending from a column that also supports a plate which can be rotated. Shackles of multiple padlocks are held uniformly on the plate. Shape of bar is such that its effective movement cannot occur when padlocks are closed. When a specific padlock is opened with its required key and rotated so its lengthened shackle rods are in front of the bar, movement of bar can occur. The slot allows sufficient bar movement to actuate a powered gate-opener, release a gate latch, or initiate other action. Imprinted numbers identify each padlock, and a pointer aids shackle-arm location in front of slotted bar. Advantages include security, access from car-windows, identifying unauthorized key-holders, and elimination of multiple key replacements when only one lock is used. Equipment size can vary so as to service between 7 and more than 150 authorized individuals.
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