Spool and lacing module provided with same

Abstract

A spool includes a shaft, a trunk, and a connection connecting the shaft and trunk. The shaft rotates around a central axis. In the trunk, a string is wound on a radially outer surface. The trunk has a flange, and a recess recessed axially upward from a lower surface of the trunk. The flange protrudes radially outward from a lower end of the trunk. The connection is disposed inside the recess and engaged with the trunk in a circumferential direction and a lower surface is connected to the shaft. The connection has a groove recessed axially downward from an upper surface of the connection and is disposed with the string, and an engagement claw disposed in an upper end of the connection. The trunk has an engagement portion disposed on a radially inner surface of the recess and engaged axially with the engagement claw.

What is claimed is: 
     
         1 . A spool comprising:
 a shaft which rotates about a central axis extending vertically;   a trunk portion in which a string material is wound on a radially outer surface; and   a connection portion which connects the shaft and the trunk portion, wherein   the trunk portion has a first recess portion which is recessed axially upward from a lower surface, an annular lower flange portion which protrudes radially outward from a lower end portion, and an engagement portion which is disposed on a radially inner surface of the first recess portion, and   the connection portion is disposed inside the first recess portion such that a lower surface is connected to the shaft, and has a first groove portion which is recessed axially downward from an upper surface and disposed with the string material and an engagement claw which is disposed in an upper end portion and engaged axially with the engagement portion.   
     
     
         2 . The spool according to  claim 1 , wherein
 a pair of the engagement claws is disposed with the first groove portion interposed therebetween.   
     
     
         3 . The spool according to  claim 1 , wherein
 the engagement claw has   an erected portion which extends axially upward from the upper surface of the connection portion, and   a projection portion which protrudes radially outward from an upper end portion of the erected portion, and   the engagement portion protrudes radially inward from a radially inner surface of the first recess portion, and an upper surface is in contact with a lower surface of the projection portion.   
     
     
         4 . The spool according to  claim 1 , wherein
 the trunk portion has a second groove portion which is recessed axially upward from the lower surface and extends radially outward from the first recess portion to be disposed with the string material.   
     
     
         5 . The spool according to  claim 4 , wherein
 the trunk portion has a slit which penetrates the lower flange portion in an axial direction and extends radially inward from a radially outer peripheral edge of the lower flange portion.   
     
     
         6 . The spool according to  claim 5 , wherein
 an inner wall of the slit has an inclined surface of which a width narrows toward an axially upper side.   
     
     
         7 . The spool according to  claim 1 , wherein
 the connection portion is made of resin, and   at least a part of the shaft is made of metal.   
     
     
         8 . The spool according to  claim 1 , wherein
 a contact surface of the shaft with the connection portion has a larger surface roughness than a non-contact surface of the shaft with the connection portion.   
     
     
         9 . The spool according to  claim 1 , wherein
 the connection portion has a connection recess portion which is recessed axially upward from a lower surface and disposed with an upper end portion of the shaft, and   in an upper end of the shaft, a surface roughness of a radially outer surface in contact with the connection recess portion is larger than a surface roughness of an upper surface in contact with the connection recess portion.   
     
     
         10 . The spool according to  claim 1 , wherein
 the connection portion has a pile portion which protrudes axially downward from a lower surface, and   the shaft has an insertion hole which is recessed axially downward from an upper surface and disposed with the pile portion.   
     
     
         11 . The spool according to  claim 10 , wherein
 in the shaft, a surface roughness of a radially inner surface of the insertion hole is larger than a surface roughness of a radially outer surface.   
     
     
         12 . A lacing module comprising:
 the spool according to  claim 1 .