Umbrella opening and closing device without use of spring latches

摘要

An umbrella opening and closing device adapted for a non-foldable umbrella and is particularly characterized in its simple structure and the lack of conventional spring lactches used to support the main runner in place when the canopy of the umbrella is opened. The present opening and closing device is made up of a first retainer extended from a fixed upper mounting member and a second retainer secured to the slidable main runner that are able to be tightly engaged with each other when the umbrella is opened and can be forced to separate when the umbrella is to be collapsed. A rib fixing ring having a plurality of securing recesses disposed on the periphery thereof is located just below the second retainer for the catching of the ribs of the closed umbrella. The first retainer is provided with a number of female cavities and the second retainer is provided with a number of male protrusions; each male protrusion and each female cavity is made integrally complementary in shape to each other so that each protrusion can be tightly fitted in the corresponding cavity when the first retainer and the second retainer is engaged with each other so as to firmly keep the main runner in place for opening the umbrella.