OVERHEAD DOOR BACKUP SPRING SYSTEM

摘要

The present invention essentially comprises an activation unit of an overhead door backup spring system operable upon failure of a spring, and method of using an activation unit. The activation unit has a rotating and sliding plunger that is operated upon failure of a spring. The activation unit can be used with an engagement unit that is engageable with an auxiliary spring to transfer torque from the auxiliary spring to an overhead door shaft. A plunger sleeve supports and guides the plunger by way of a sleeve slot that receives a plunger pin extending from the plunger. A plunger spring biases the plunger, while the sleeve slot retains the plunger in a biased state until activation by a portion of the spring upon failure of the spring.

主权项

1. An activation unit for operation upon failure of a spring, said activation unit comprising:
a plunger having an extension, said extension being operably associated with a portion of said spring, said plunger having a configuration to be operable upon failure of said spring.