Shoestring tightening device

Abstract

The present invention provides a shoestring tightening device characterized by comprising: a lower body, which has at least one semi-circular shoestring passing hole formed on the periphery thereof, and which has a protrusion hole formed on the bottom surface thereof; a cylindrical rotation guide, which has a shaft protrusion that is fitted to the protrusion hole, which has a shoestring passing groove formed on the periphery thereof so as to communicate with the shoestring passing hole, and which has at least two fixing grooves formed on the inner peripheral surface thereof; a disk-shaped rotor, which has at least two fixing members that are fitted to the fixing grooves, which has a cylindrical spring containing protrusion protruding from one-side surface thereof, which has rotor teeth formed on the other-side surface thereof and arranged in a circular shape, and which has a shaft protruding from the center of the other-side surface thereof; an upper cover, which is assembled correspondingly so as to seal the upper surface of the lower body, which has a semi-circular shoestring passing hole formed on the periphery thereof so as to correspond to the shoestring passing hole, which as a through-hole formed on the ceiling surface thereof such that the shaft penetrates the same, and which has cover teeth formed on the periphery of the through-hole so as to mesh with the rotator teeth, thereby causing the same to rotate only in one direction; and a spring interposed between the rotation guide and the rotor such that the rotor teeth remain engaged with the cover teeth.

1 . A shoestring tightening device comprising:
 a lower body having at least one semicircular shoestring passing hole formed in a periphery thereof and a projection hole formed in a bottom surface thereof;   a cylindrical rotation guide having an axial projection fitted into the projection hole, the cylindrical rotation guide being provided with a shoestring passing groove formed in a periphery thereof to communicate with the shoestring passing hole, and at least two fixing grooves formed in an inner surface thereof;   a disc-shaped rotor having at least two fixtures fitted into the fixing grooves, the rotor being provided with a cylindrical spring accommodation protrusion protruding from one surface thereof and rotor teeth arranged in a circular shape on an opposite surface thereof with a shaft protruding from a center of the opposite surface;   an upper cover coupled to seal an upper surface of the lower body, the upper cover having a semicircular shoestring passing hole formed in a periphery thereof to correspond to the shoestring passing hole, a through hole through formed in a ceiling surface thereof and allowing the shaft to pass therethrough, and cover teeth formed around the through hole so as to be engaged with the rotor teeth and rotated in one direction; and   a spring interposed between the rotation guide and the rotor to keep the rotor teeth and the cover teeth mated with each other.