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Permanently engaged—the motor driven mechanism (the opener portion) is always joined to the closer (if present) and to the door. When opening the door manually, the user is also driving the opener portion, so the opening is rough and noisy. Electro-hydraulic types are inherently quiet and smooth during manual opening, as the motor and pump ...
The weight of the door may be 400 lb (180 kg) or more but is balanced by either a torsion spring system or a pair of extension springs. [2] A garage door opener is controlled motorized mechanism for opening garage doors adds convenience, safety, and security often used with a remote or a button on wall. [3]
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.
The backbone of any electric gate, whether automatic or not, is the electric gate motor, two distinct motor types exist hydraulic, or electromechanical. This is the electric device which actually enables the electric gate to open and close without having to manually push the gate.
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A swing bridge (or swing span bridge) is a movable bridge that can be rotated horizontally around a vertical axis. It has as its primary structural support a vertical locating pin and support ring, usually at or near to its center of gravity, about which the swing span (turning span) can then pivot horizontally as shown in the animated illustration to the right.
A station wagon (US, also wagon) or estate car (UK, also estate) is an automotive body-style variant of a sedan with its roof extended rearward over a shared passenger/cargo volume with access at the back via a third or fifth door (the liftgate, or tailgate), instead of a trunk/boot lid. [1]
ZA607 Tornado GR4 on the gate at MoD Sealand, Wales. [353] ZA614 Tornado GR4 on the gate at RAF Marham, Norfolk, England. [354] ZD744 Tornado GR4 on display at Montrose Air Station Heritage Centre, Angus, Scotland. [355] ZE204 Tornado F3 on display at the North East Land, Sea and Air Museums, Tyne and Wear, England. [356]
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