an umbrella frame has a pivotal connection between a crown or slider and canopy spokes or struts , respectively . the connection involves a sheet metal sleeve , which is carried on a stick and has , integrally formed with it , an annular flange and lobes . each lobe comprises an axially extending inner section and an , initially outwardly extending , outer section . during assembly , the outer sections are curled inwards about pivot pins for the spokes or struts , which are seated in radius portions at the junctions of the inner and outer lobe sections .