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A United States Navy Douglas R6D-1 Liftmaster, BuNo 131612, c/n 43715, of Air Transport Squadron 3 (VR-3), assigned to the Military Air Transport Service, hits a cliff on Pali Kea Peak in the Waianae Range on Oahu, 15 miles (24 km) northwest of Honolulu, Territory of Hawaii, United States, at 02:03, killing all 57 passengers and nine crew ...
Chamberlain, LiftMaster, and Craftsman have interchangeable parts, primarily the gear and circuit boards. The greatest difference between the brands is that Chamberlain and Craftsman operate on a square shaped split-rail system, while LiftMaster consists of one single solid piece of inverted t-shaped rail.
1958 – A USAF Douglas C-118A Liftmaster military transport, 53-3277, of the 1611th ATW, and a United States Navy Lockheed P2V-5F Neptune patrol bomber, BuNo 127723, collided over Norwalk, California (a suburb of Los Angeles) at night. 47 servicemen were killed as well as a 23-year-old civilian woman on the ground who was hit by falling debris ...
The electric overhead garage door opener was invented by C.G. Johnson in 1926 in Hartford City, Indiana. [1] Electric Garage Door openers did not become popular until Era Meter Company of Chicago offered one after World War II where the overhead garage door could be opened via a key pad located on a post at the end of the driveway or a switch inside the garage.
Also called fail-open. In this configuration, applying electric current to the strike will cause it to lock. It operates the same as a magnetic lock would. If there is a power failure, the door opens merely by being pushed or pulled. A new trend is a strike that is quickly reversible from fail safe to fail secure (and back again if needed).
A self-closing hinge combines door closers and spring hinges with an optional hold open feature into one component. These closer hinges eliminate the visual and physical clutter of using additional devices, as well as reduce maintenance problems associated with overhead and in-floor door closers.
Electric locks use magnets, solenoids, or motors to actuate the lock by either supplying or removing power. Operating the lock can be as simple as using a switch, for example an apartment intercom door release, or as complex as a biometric based access control system. There are two basic types of locks: "preventing mechanism" or operation ...
The keyhole of a mechanical cam lock is usually the same as an ordinary padlock. A physical key is used to unlock the lock. The physical key has a notch or slot corresponding to the obstacle in the cam lock, allowing it to rotate freely in the lock. Different from mechanical cam locks, electronic cam locks use an electronic key to unlock.