An automatic umbrella comprising:
- a central shaft means having an upper tubular shaft slidably telescopically engageable with a lower tubular shaft and extendibly positioned above said lower tubular shaft, said lower tubular shaft secured on a grip;
- a rib assembly having at least a top rib pivotally secured to an upper notch fixed on a top portion of said upper shaft, and a stretcher rib pivotally secured with said top rib and pivotally secured to a lower runner slidably held on said central shaft means;
- an extending spring retained in between said upper shaft and said lower shaft for operatively opening the umbrella;
- an inner sleeve fixed in said upper shaft and inserted in said extending spring with each coiled spring ring of said extending spring slidably surrounding said inner sleeve for preventing noise caused by a frictional contacting between said extending spring and an inside wall of said upper shaft of said shaft means;
- a plurality of retraction restoring springs each retained on said rib assembly for operatively closing the umbrella from an opened state of the umbrella;
- and
- a control means including a push button slidably held in said grip, an opening controller for operatively opening the umbrella from its closed state, and a closing controller for operatively closing the umbrella from its opened state;
- said central shaft means including:
- said lower tubular shaft having a lower end portion of the lower tubular shaft insertably fixed in the grip, a rod hole formed in the lower end portion at a first side of the grip, a shaft slot formed in the lower shaft at a second side opposite to the first side, and an upper enlarged portion formed on an upper end portion of the lower shaft;
- said upper tubular shaft slidably jacketed on the lower tubular shaft having a lower contraction portion formed on a lower portion and engageable with the upper enlarged portion of the lower shaft, an engaging hole formed in the lower portion of the upper shaft at the second side of the grip, and an inner block formed in an upper end portion of the upper shaft having a sliding groove recessed in the inner block;
- a lower sleeve fixed in the grip within the lower shaft having a triangular block portion formed in the lower sleeve at the first side of the grip, an inner rod hole formed in the lower sleeve positioned below the triangular block portion, a resilient plate cut in the lower sleeve at the second side of the grip corresponding to the triangular block portion to form a slot along a contour of the resilient plate, and an upper sleeve end portion formed on an upper end portion of the lower sleeve;
- and said inner sleeve having a lower end portion of the inner sleeve protruding towards a coupling portion with the upper enlarged portion of the lower shaft engaged with the lower contraction portion of the upper shaft, and an upper end portion of the inner sleeve inserted in the inner block;
- said inner sleeve disposed in the extending spring to allow each coiled spring ring of the extending spring telescopically surrounding the inner sleeve to prevent a frictional contacting between the extending spring and an inside wall of the upper and lower shafts for noise prevention and smooth operation of the umbrella.