Patent ID: 8469248

Claim:
A fastening device for a bicycle, wherein the fastening device for the bicycle comprises: a fixed assembly having: a first fixed holder mounted on a frame; and a second fixed holder mounted on the frame and being apart from the first fixed holder a distance; and a fastening assembly for supporting a water bottle, and the fastening assembly having: a first movable socket detachably engaged into the corresponding first fixed holder; and a second movable socket detachably engaged into the corresponding second fixed holder; wherein each of the first fixed holder and the second fixed holder has a profile of a pulley having a groove on a periphery of the pulley; wherein each of the first movable socket and the second movable socket has a horseshoe-shape portion having an opening, wherein the horseshoe-shape portion is used for correspondingly engaging into the groove of the first fixed holder or the second fixed holder, and two guiding portions formed on two ends of the opening of the horseshoe-shape portion for guiding the horseshoe-shape portion to engage into the groove of the first fixed holder or the second fixed holder; and wherein an inner diameter of the horseshoe-shape portion of the first or second movable socket is substantially equal to a diameter of the groove of the first or second fixed holder, and a width of the opening of the horseshoe-shape portion is smaller than the inner diameter of the horseshoe-shape portion; wherein the fastening assembly comprises two wing plates symmetrically arranged on sides of the water bottle and having a curved profile corresponding to the water bottle; and a width of an outer end of the two wing plates is greater than that of an inner end thereof, and the water bottle further comprises a sheath in which the water bottle is received; and wherein the sheath comprises two inserted portions, and the two inserted portions can be inserted by the two wing plates, so that the sheath can be connected to the fastening assembly.