Wireless umbrella frame

摘要

An umbrella frame having an upper mounting member (11) fixed on the upper end of a central shaft (10) and a lower mounting member (12) slidable on said shaft with a circumferential series of outer ribs (13) pivoted at the upper end to the upper mounting member (11), and stretcher rods (16) pivotally connecting intermediate portions of said ribs (13) to said lower mounting member (12). The pivotal connections between the mounting members (11) and (12) and the ribs (13) and rods (16) are locked in place by retainer plates (25) and (25a) respectively, movable on the shaft (10).