Patent ID: 6923193

Claim:
A stand frame for an umbrella comprising: a main shaft composed of an upper tube, a middle tube connected to the upper tube, a lower tube, and a connecting sleeve connecting the middle and the lower tubes; a stand base substantially mounted on a lower end of the lower tube; a top cover substantially mounted on an upper end of the upper tube; a height-adjustable device substantially mounted on the lower tube; a lower sleeve mounted on the upper tube and being capable of sliding thereon; a long hanger arm pivotally mounted on the lower sleeve; a short hanger arm with two ends respectively pivotally connected to the top cover and the long hanger arm; a fixing support including an L-shaped base section, a rotational section, and a connecting section; an axle passing through the rotational section and the connecting section; the connecting section being connected to the long hanger arm; an umbrella frame composed of an upper hinge disk, a lower hinge disk, a multi-sectional telescopic tube having two ends the upper hinge disk and the lower hinge disk being respectively mounted at, a plurality of main ribs each pivotally connected to the upper hinge disk and a plurality of connecting ribs each with one end pivotally connected to the lower hinge disk and with the other end connected to a main rib; an umbrella-opening string with one end tied to the top cover, passing around a pulley atop the umbrella frame, through a connecting column, and into the multi-sectional telescopic tube, and with the other tied to the lower hinge disk; an upper-tube-pulling string partially wound around a windlass in the height-adjustable device on the lower tube, passing around a pulley at an upper end of the middle tube and below a lower end of the upper tube, and being tied at a bottom of the upper tube; and a lower-sleeve-pulling string with one end tied to the lower sleeve, passing around a pulley atop the upper tube and entering the upper tube, and with the other tied at a top of the middle tube; a vertical movement of the upper tube driving a corresponding vertical movement of the lower hinge disk by the lower-sleeve-pulling string, causing the long hanger arm to extend of to contract, which makes the umbrella-opening string to open or to close the umbrella frame.