Drop-out mounting structure of bicycle frame

Abstract

A drop-out mounting structure for mounting a drop-out member as a wheel mounting unit to a drop-out mounting unit of a bicycle frame is disclosed. The drop-out mounting structure includes: upper and lower assembly slots respectively formed at an upper end and a lower end of the drop-out mounting unit to insert the drop-out member inside the drop-out mounting unit; and a stopper unit formed in a front and rear direction at an upper end part of the drop-out member. In particular, the drop-out member is inserted to the lower assembly slot through the upper assembly slot by turning the drop-out member in a direction and turned in other direction while being moved in a rear side such that the drop-out member supports an inner upper end of the drop-out mounting unit through the stopper unit, and is fastened to the drop-out mounting unit by the bolt.

What is claimed is: 
     
         1 . A drop-out mounting structure for mounting a drop-out member as a wheel mounting unit to a drop-out mounting unit of a bicycle frame in which two side panels that are respectively stamp-molded are bonded by welding with a bolt, the drop-out mounting structure comprising:
 upper and lower assembly slots respectively formed in a front and rear direction at an upper end and a lower end of the drop-out mounting unit to insert the drop-out member inside the drop-out mounting unit; and   a stopper unit formed in the front and rear direction at an upper end part of the drop-out member with a length that is longer than an opening end of the upper and lower assembly slots,   wherein the drop-out member is inserted to the lower assembly slot through the upper assembly slot by turning the drop-out member in a direction, is turned in other direction while being moved in a rear side, supports an inner upper end of the drop-out mounting unit through the stopper unit, and is fastened to the drop-out mounting unit by the bolt.   
     
     
         2 . The drop-out mounting structure of  claim 1 , wherein
 front and rear ends of the stopper unit support both side edge parts in the front and rear direction of the upper assembly slot inside the drop-out mounting unit.   
     
     
         3 . The drop-out mounting structure of  claim 1 , wherein
 the stopper unit includes:   a first stopper protrusion formed to be protruded from the upper end part of the drop-out member to the rear side; and   a second stopper protrusion formed to be protruded from the upper end part of the drop-out member to a front side with a protrusion length that is larger than the first stopper protrusion.   
     
     
         4 . The drop-out mounting structure of  claim 3 , wherein,
 inside the drop-out mounting unit,   the first stopper protrusion supports a rear side edge part of the upper assembly slot, and   the second stopper protrusion supports a front side edge part of the upper assembly slot.   
     
     
         5 . The drop-out mounting structure of  claim 4 , wherein
 the first stopper protrusion is in surface contact with a rear upper part that is rounded in an up and down direction of the drop-out mounting unit.