The spring powered garage door lifter for slab doors is almost always of the kind illustrated in the video. Just how the linkage works is a mystery to most people and it's not easy to study a real one while it's working. The animated model makes it easy to see, it's just a lever lifting the door at its center line while a second link tips the slab from vertical to horizontal. Holmes the best known spring maker has repackaged the parts to make a safer more trouble free installation but the links and levers still work like this illustration.
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