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In 1958, Frantz bought a controlling interest in Sterling Electronic Door Control Corporation which had earlier patented a new concept in garage door openers. Frantz then began marketing the openers with the doors. In 1959, Frantz introduced the first successful lightweight fiberglass garage door to the marketplace under the brand name "Filuma".
In May 1954, the Alliance Manufacturing Company first produced its own garage door opener and called it Genie. [2] In 1983 the company entered the home and shop vacuum market, and in 1985 it changed its name to Genie Home Products. [2] Overhead Door Corporation purchased the company in 1994. [2] The Genie Company is headquartered in Mt. Hope ...
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.
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The original feature of the patent was what is now called tube-over-bar (TOB) design which only saw limited use in the 1960s (for example, on LVTP-7). Even though Barnes was employed by the US Army Ordnance Department, torsion bars were not used in American armor designs until the T70 GMC in 1943, which suspension was derived from Pz. III by GM ...
A torsion box consists of two thin layers of material (skins) on either side of a lightweight core, usually a grid of beams. It is designed to resist torsion under an applied load. A hollow core door is probably the most common example of a torsion box (stressed skin) structure. The principle is to use less material more efficiently.
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