Patent ID: 8353087
Filing Date: 2013-01-15
Classification: A43C,Y10T

Abstract:
1. A closure device comprising: a knob, the knob having a spindle extending from a bottom thereof, the spindle having a thread positioned therearound, the knob having at least one curved groove defined in the bottom thereof and located adjacent to the spindle; a ratchet member mounted on the bottom of the knob, the ratchet member having at least one rib disposed thereon for being correspondingly received in the at least one curved groove, the ratchet member having a cavity defined therein and passing therethrough, the ratchet member having a series of ratchet teeth formed on a bottom thereof and located around the cavity; an engaging member movably received in the cavity, the engaging member having an engaging hole defined therein and passing therethrough, the engaging hole having at least one protrusion inwardly extending from an inner periphery thereof for engaging with the thread of the spindle, the engaging member having an engaging gear formed on a bottom thereof and annularly located around the engaging hole; a spool mounted on a bottom of the engaging member, the spool having a spool gear annularly formed on a top thereof for corresponding to the engaging gear, the spool gear having a spool hole defined therein and passing therethrough; a stopper mounted around the spool, the stopper having at least one tooth formed on a top thereof for unidirectionally engaging with the ratchet teeth of the ratchet member; and a base, the base having a pivot extending therefrom and passing through the spool hole, the engaging hole, and the cavity and fixed on the knob; the stopper, the spool, the engaging member, and the ratchet member received in the base; wherein, when the knob is rotated toward a first direction, the knob rotated relative to the ratchet member and the engaging member, the at least one rib moved along the first direction and abutted against an inner periphery of the at least one curved groove such that the ratchet member is driven by the knob and simultaneously rotated with the knob, the engaging member being engaged by the thread of the spindle and restricted in the cavity such that the engaging member is downwardly moved relative to the ratchet member, the engaging gear engaged with the spool gear of the spool, such that the knob simultaneously drives the ratchet member, the engaging member, and the spool for adapting to wind a lace; when the knob with the ratchet member are rotated toward the first direction, the ratchet teeth of the ratchet member engaging with the at least one tooth of the stopper, the stopper downwardly moved such that the at least one tooth is ratchetably engaged with the ratchet teeth and the ratchet member is able to ratchetably rotate toward the first direction; when the knob is rotated toward a second direction which is opposite to the first direction, the engaging member being not able to rotate toward the second direction such that the knob is rotated relative to the engaging member along the second direction, the engaging member being engaged by the thread of the spindle and restricted in the cavity such that the engaging member is upwardly moved relative to the ratchet member for disengaging from the spool, the spool released and being free to rotate.