Extension spring systems should always be restrained by a safety cable that runs through the middle of the spring, tying off to a solid point at the rear and front of the horizontal door track. Extension springs represent a hazard to bystanders when a spring, pulley, or cable breaks under tension. Metal parts from extension spring systems can suddenly be launched.
The history of the garage door could date back to 450 BC when chariots were stored in gatehouses, but in the U.S. it arose around the start of the 20th century. As early as 1902, American manufacturers—including Cornell Iron Works—published catalogs featuring a "float over door." Evidence of an upward-lifting garage door can be found in a catalog in 1906.
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Most mechanical dock levelers use snubber mechanisms to lift the lips as they are raised, and they close slowly as shocks absorb the weight of the lip. In many of the Kelley dock levelers, however, a push bar and a yieldable rod are connected to a link assembly so that when the deck is raised the push bar drops down. Then, as someone walks across to the outside of the dock leveler, the plate on the push bar catches on the middle bolt allowing the push bar to raise the lip..
Sears Craftsman Garage Door Openers are America’s favorite. We have several options to choose from that will fit your individual needs. Sears garage door opener selections includes 1/2 horsepower, 3/4 horsepower, belt and chain drive as well as the Craftsman Smart Control garage door opener which allows you to control and monitor your garage door even when you are away from home.
Daniel returned my call in ten minutes. It was late in the afternoon and he was at my residence within two hours, arriving half an hour earlier than anticipated. My garage door opener was malfunctioning and the fix was quick and easy. After the repair Daniel lubricated all the garage door springs and joints. Very personable and obviously knowledgeable, he explained everything I needed to do to maintain trouble-free operation of the door. HIGHLY recommend !