Spool and lacing module provided with same

Abstract

A spool includes a shaft, a trunk portion, and an upper lid portion. The shaft rotates around a central axis extending vertically. The trunk portion has a lower portion connected with the shaft, a radially outer surface wound with a string material, and an upper surface having a groove portion disposed with the string material. The upper lid portion is disposed on the upper surface of the trunk portion. One of the trunk portion and the upper lid portion has an engagement protrusion portion protruding in an axial direction, and the other has a first recess portion which is recessed in the axial direction and engaged axially with the engagement protrusion portion disposed inside. The upper lid portion covers at least a part of the groove portion.

What is claimed is: 
     
         1 . A spool comprising:
 a shaft which rotates about a central axis extending vertically;   a trunk portion which has an upper surface having a groove portion disposed with a string material, a lower portion connected with the shaft, and a radially outer surface wound with the string material; and   an upper lid portion which is disposed on the upper surface of the trunk portion, wherein   one of the trunk portion and the upper lid portion has a first protrusion portion protruding in an axial direction, and another has a first recess portion recessed in the axial direction and engaged axially with the first protrusion portion, and   the upper lid portion covers at least a part of the groove portion.   
     
     
         2 . The spool according to  claim 1 , wherein
 one of an outer surface of the first protrusion portion and an inner surface of the first recess portion is formed with a pair of protruding portions extending in a radial direction, and another is formed with a holding portion which holds the protruding portion slidably in the radial direction.   
     
     
         3 . The spool according to  claim 1 , further comprising:
 an elastic member which is disposed between an outer surface of the first protrusion portion and an inner surface of the first recess portion and biases the upper lid portion toward the groove portion.   
     
     
         4 . The spool according to  claim 3 , wherein
 the first protrusion portion is disposed on the upper surface of the trunk portion,   the trunk portion has a second recess portion adjacent to the first protrusion portion and recessed axially downward from the upper surface,   the elastic member is disposed inside the second recess portion, and   the upper lid portion has a third protrusion portion which protrudes axially downward from the lower surface, is disposed inside the second recess portion, and is in contact with one end of the elastic member.   
     
     
         5 . The spool according to  claim 1 , wherein
 the first protrusion portion has a projection portion protruding radially outward from a tip, and   the first recess portion has an engagement recess portion which is recessed radially from an inner surface and is engaged with the projection portion.   
     
     
         6 . The spool according to  claim 5 , wherein
 the first protrusion portion is disposed on a lower surface of the upper lid portion, and   the upper lid portion has a positioning protrusion portion which protrudes axially downward from the lower surface and is disposed inside the first recess portion.   
     
     
         7 . The spool according to  claim 1 , wherein
 the first protrusion portion has a flange portion protruding radially outward from a tip on a radially outer surface,   the first recess portion has a pair of engagement pieces which is disposed on a radially inner surface and faces each other in a radial direction, and   the pair of engagement pieces is in contact with the flange portion in the axial direction with the first protrusion portion interposed therebetween.   
     
     
         8 . The spool according to  claim 7 , wherein
 a pair of the first protrusion portions is disposed on the upper surface of the trunk portion and is provided to face each other in the radial direction with the groove portion interposed therebetween.   
     
     
         9 . The spool according to  claim 1 , wherein
 the trunk portion has an annular flange portion protruding radially outward from a lower end portion.   
     
     
         10 . The spool according to  claim 1 , wherein
 a material configuring the shaft has a higher rigidity than a material configuring the trunk portion.   
     
     
         11 . The spool according to  claim 1 , wherein
 the shaft has an annular connection portion protruding radially outward from an upper end portion, and   an upper surface of the connection portion is in contact with a lower surface of the trunk portion.   
     
     
         12 . The spool according to  claim 1 , wherein
 a contact surface of the shaft with the trunk portion has a larger surface roughness than a non-contact surface of the shaft with the trunk portion.   
     
     
         13 . The spool according to  claim 1 , wherein
 the trunk 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.   
     
     
         14 . The spool according to  claim 1 , wherein
 the trunk 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 in which the pile portion is disposed.   
     
     
         15 . A lacing module comprising:
 the spool according to  claim 1 .