Patent ID: 7334590

Claim:
An anti-slip opening and closing device for an umbrella, comprising a pole having a rope therein, with one end of the rope connected to a lower hub of the umbrella; at least a strut connected to the lower hub and to a rib of an upper hub of the umbrella, and another end of the rope is reeled on a roller disposed on the pole; wherein the anti-slip opening and closing device comprises a roller connected within a wheel base; a reel screwing with the roller; a friction disc positioned on the reel and set inside a notch of a ratchet wheel; an elastic accessory positioned between the roller and the friction disc for pushing the friction disc to lean against the ratchet wheel; a block part positioned on the wheel base to resist the ratchet wheel reversion; and a bearing positioned at a side of the reel and leaning against beads positioned on a cap at another side of the wheel base.