Abstract: A canopy frame for umbrellas has a structure adapted for various shapes, making the appearance of umbrellas dexterous and interesting. The frame has a main shaft, an upper sliding notch, a lower sliding notch, multiple positioning ribs, multiple upper spreaders, upright ribs, upper angle-forming clamps, auxiliary stretchers, lower spreaders and multiple clamping pieces. Two positioning holes are on the main shaft for the fixing of the upper and lower sliding notch and at the top end of the main shaft is disposed the fixed notch. The upper and lower sliding notch mounted consecutively on the main shaft under the fixed notch. One end of each positioning rib is connected to the fixed notch and the other end is associated with an upper angle-forming clamp. One end of each upper spreader is fixed to the upper sliding notch and the other end is engaged with the middle hinge point of the upper angle-forming clamp.

Abstract: An improved canopy structure of a bi-section foldable umbrella is provided with an integrally formed slide block having an upper slider and a lower slider. A fixing mount is integrally connected to the top of the upper slider. The fixing mount, the upper slider and the lower slider are connected to one end of positioning spreaders, extending spreaders and auxiliary spreaders respectively. A canopy is fixedly engaged with some of the spreaders. All the extending spreaders and the auxiliary spreaders are bound together in pairs by an inverted T-shaped member at the middle thereof . At the ends of each paired extending spreader and the auxiliary spreader is disposed a tri-point connector so as to permit an elongated rib downwardly extended from the connector. The periphery of a canopy can thus be vertically supported along the edge thereof for better shelter of a person under the umbrella.