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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]
Garage Door Sectional Torsion Spring A mousetrap powered by a helical torsion spring Video of a model torsion pendulum oscillating. A torsion spring is a spring that works by twisting its end along its axis; that is, a flexible elastic object that stores mechanical energy when it is twisted.
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.
Sears Hometown and Outlet Stores Inc. was an American retail company that sold home appliances, lawn & garden equipment, apparel, mattresses, sporting goods, and tools. [3] [4] The company had four subsidiary store formats: Sears Hometown, Sears Outlet, Sears Hardware and Appliance, and Sears Home Appliance Showrooms. [5]
Craftsman is a line of tools, lawn and garden equipment, and work wear.Originally a house brand established by Sears, the brand is now owned by Stanley Black & Decker.. As with all Sears products, Craftsman tools were not manufactured by Sears during the company's ownership, but made under contract by various other companies.
A torsion spring is a spring that works by twisting; when it is twisted about its axis by an angle, it produces a torque proportional to the angle. A torsion spring's rate is in units of torque divided by angle, such as N·m/rad or ft·lbf/degree. The inverse of spring rate is compliance, that is: if a spring has a rate of 10 N/mm, it has a ...
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