UPWARD ACTING DOOR OPENERS KNOWN AS

Brand	Owner	Address	Description
AUTO-MATE	OVERHEAD DOOR CORPORATION	2501 S. State Highway 121, Suite 200 Lewisville TX 75067	UPWARD-ACTING DOOR OPENERS (KNOWN AS DOOR OPERATORS) AND HARDWARE, FIXTURES, PARTS, MECHANISMS AND EQUIPMENT FOR EMBODIMENT IN SUCH DOOR OPENERS OR USE IN CONNECTION THEREWIHT, INCLUDING ELECTRICAL AND OTHER AUTOMATIC DEVICES;
	Where the owner name is not linked, that owner no longer owns the brand

Technical Examples

A counterbalance system for an upward-acting door includes spaced-apart wall brackets and cable drums supported on the brackets and connected to flexible cables which depend from the drums and connected to the lower side edges of an upward-acting sectional garage door. One or both of the cable drums may be connected to one end of a torsion coil spring and the opposite end of each spring is connected to a hub assembly. Elongated spring winding and protective cover tubes are sleeved over the springs and are connected to the brackets by worm-gear drive winding mechanisms, respectively, for rotating the tubes to effect winding of the torsion coil springs through the hub assemblies but preventing rotation of the tubes during normal operation of the counterbalance system. The cable drums and spring hub assemblies may be supported on an elongated synchronizing shaft or a torque transfer shaft extending between and supported on the wall brackets.