Overhead garage door spring safety device

Claim 1

In a garage door structure having a door opening and a door movable between a closed position and an open position and means exerting force to maintain the door in open or closed position comprising: a. guide tracks arranged adjacent sides of a door opening, said guide tracks each having a vertical section and a horizontal section connected to ane extending from said vertical section; b. a door for closing said door opening, said door having rollers which are guided in the track sections for movement of the door between a closed vertical position and an open horizontal position; c. a pair of elongate coiled springs each positioned generally horizontally and above a respective horizontal section of the guide tracks, said coiled springs each having open ends with one of said ends fixed relative to the respective guide track and the other ends connected through cables and pulleys to lower portions of the door whereby said coiled springs are stretched in variable degree by being elongated and acting as counterbalances as the door is moved to closed position; d. an elongated flexible member of wire rope extending longitudinally through each coiled spring and having first and second end portions extending from said one and other ends respectively of said coiled springs, said flexible members being of a length greater than the extended length of the coiled springs in door operating positions; e. means fixing said first end portions of the elongated flexible members to a respective guide track adjacent to and beyond said fixed one end of the respective coiled spring; f. means connecting said second end portions of said elongated flexible members relative to a door structure adjacent to and beyond said other end of the respective coiled spring when said coiled springs are elongated in door closed position, said connecting means each including an extensible resilient member applying tension on the respective elongated flexible member, said coiled springs being sleeved on the respective elongated flexible members whereby said elongate flexible members are each adapted to support the respective coiled spring when same is in contracted position and in the event of breakage of a coiled spring the parts thereof are retained on the respective elongate flexible member.