Leverage-based large-sized umbrella

摘要

An umbrella includes an internal shaft fit into an interior chamber of a central post. A cap is fixed to a top end of the internal shaft. An intermediate collar is movably fit to the central post and a runner located below the collar is fixed to the central post. Each of ribs has an inner end connected to the cap. Each of stretchers has two ends connected to the intermediate collar and the respective rib. Each of the driving bars has ends connected to the runner and the respective rib at a location between the connection of the rib to the cap and the connection of the rib to the respective stretcher. A connector is movably fit over the central post below the runner and is connected by a pull bar to the intermediate collar. The connector includes a fixing member engageable and fixable to the central post.