Automatic umbrella having stable extending and folding structure

Claim 1

An automatic umbrella comprising: a telescopic shaft means including a lower outer tube, an upper inner tube telescopically mounted in the lower outer tube, a lower sleeve inserted in a lower portion of said lower outer tube, and a shaft-restoring spring held in said shaft means for resiliently extending said upper inner tube beyond said lower outer tube; a grip fixed on a lower portion of said lower outer tube having a tip cap formed on an upper portion of said grip defining a tip socket therein, a push button protruding laterally from a lower locking means pivotally formed in said lower sleeve through the grip, and an upper hook portion formed on an upper portion of said locking means resiliently urged by a hook spring formed in said sleeve to be protruded outwardly through said lower sleeve and said lower tube; a lower runner pivotally secured with a stretcher rib of a rib assembly means secured with an umbrella cloth thereon having a central cylindrical hole formed through said lower runner having a diameter slightly larger than an outside diameter of said lower outer tube, and at least a hook hole formed in said lower runner operatively engageable with said hook portion of said lower locking means; a middle runner pivotally secured with a main rib of said rib assembly means having a truncated-cone hole formed in an upper portion of a runner sleeve retaining a rib-restoring spring in said runner sleeve and on said lower runner for resiliently extending said rib assembly means; and an upper notch pivotally secured with a top rib of said rib assembly means having an upper sleeve protruding downwardly from said upper notch to be slidably engageable with said truncated-cone hole in said middle runner for stabilizing said upper notch and said middle runners when opening the automatic umbrella.