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Surface mount, push (scissor arm)—the operator is mounted on the wall above the door, on the approach side and pushes the door with a linkage of 2 arms. Surface mount, pull (track)—the operator is mounted on the wall above the door, on the swing side and pulls the door with an arm whose end slides in a track mounted on the door. Underfloor ...
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.
An electric garage door opener operates on the center track. A typical version of an overhead garage door used in the past would have been built as a one-piece panel. [1] The panel was mounted on each side with an unequal parallelogram-style hinge lifting mechanism.
Overhead or surface-mounted door closers come in four variations: slide-track arm, regular arm surface mounted, parallel arm surface mounted, and top jamb mounted, most are surface mounted although some manufacturers offer concealed models too.
The system works via a series of track mounted balises, which function as information beacons transmitting a speed code to the train as it passes overhead. [citation needed] Its designers intended its function to be non-vital, and for this reason, the design is not fail-safe. [2]
The generic term used by the International Union of Railways for the technology is overhead line. [1] It is known variously as overhead catenary, overhead contact line (OCL), overhead contact system (OCS), overhead equipment (OHE), overhead line equipment (OLE or OHLE), overhead lines (OHL), overhead wiring (OHW), traction wire, and trolley wire.