Abstract: An apparatus for use with an elevator car is operable to selectively lock an elevator car door. The apparatus verifies that the elevator car door is closed, locks the elevator car door, and verifies that a lock is engaged. Once conditions are met, the apparatus signals an elevator controller that the elevator car can move through a hoistway. The apparatus further ensures that passengers can safely disembark from the elevator car by detecting the position of the elevator car relative to a designated landing zone within the hoistway, and confirming the elevator car is stopped at a landing zone prior to disengaging the lock. The apparatus thus ensures that the elevator car door remains closed while the elevator car is in motion or between landing zones.

Abstract: An apparatus for use with an elevator car is operable to selectively lock an elevator car door. The apparatus verifies that the elevator car door is closed, locks the elevator car door, and verifies that a lock is engaged. Once conditions are met, the apparatus signals an elevator controller that the elevator car can move through a hoistway. The apparatus further ensures that passengers can safely disembark from the elevator car by detecting the position of the elevator car relative to a designated landing zone within the hoistway, and confirming the elevator car is stopped at a landing zone prior to disengaging the lock. The apparatus thus ensures that the elevator car door remains closed while the elevator car is in motion or between landing zones.

Abstract: A model aircraft construction jig includes an elongate baseboard, a plurality of fuselage side cramp members, means for fixing the side cramp members on the baseboard, a tail unit locator and means for fixing the tail unit locator on the baseboard. The baseboard has at least one longitudinal guide line defining a reference center line, and the side cramp members are positionally adjustable so as to be arranged in rows spaced at opposite sides of the center line so that clamping faces thereof can engage respective side walls of a fuselage assembled on the center line.

Abstract: A model aircraft wing construction jig comprises an elongate front assembly rail, a wing rib carrier rod, and a pair of end clamp members which all assemble together to form a jig structure wherein the front assembly rail and wing rib carrier rod extend, in adjustable spaced-apart relationship, between the end clamp members. The front assembly rail has longitudinally-extending jaws to hold therebetween a flat strip of wood with one longitudinal edge portion of said strip forming a tongue protruding from one side of the assembly rail to engage notches in the leading end edges of the wing rib components threadably mounted on the wing rib carrier rod which inserts through accurately located holes preformed in the body of said rib components.