A Small Motor Used to Open Large Doors
LARGE doors like the ones used on garages are difficult to handle, and for this reason I made the attachment
illustrated, which may be operated with a push-button.
I attached a motor of suitable size and power at the top of the door on the inside, its shaft being supplied with a small pinion which meshes into teeth on a segment fastened to the wall or other suitable support.—_H. B. PEARSON