Fastening device

Abstract

Provided is a fastening device including: a cover; a reel; and a base, in which the cover includes a flat portion, a first cover-side protruding portion, the reel includes a first reel-side flange portion, a first reel-side cylindrical portion, and a second reel-side flange portion, the base includes a base-side flange portion, a base-side protruding portion, and a claw, the reel is located on an inner peripheral side of the base-side protruding portion, the first cover-side protruding portion is located on the inner peripheral side of the base-side protruding portion and an outer peripheral side of the first reel-side flange portion, the ratchet gear and the claw are configured to engage with each other, and the first cover-side lock portion and a first reel-side lock portion are configured to engage with each other.

What is claimed is: 
     
         1 . A fastening device comprising:
 a cover;   a reel; and   a base,   wherein the cover includes a flat portion, a first cover-side protruding portion, a first cover-side lock portion, and a ratchet gear,   the first cover-side protruding portion is provided at a lower surface of the flat portion, and protrudes downward,   the first cover-side lock portion is provided at an inner peripheral surface of the first cover-side protruding portion,   the ratchet gear is provided at an outer peripheral surface of the first cover-side protruding portion,   the reel includes a first reel-side flange portion, a first reel-side cylindrical portion, and a second reel-side flange portion,   the first reel-side flange portion is provided, at an outer peripheral surface thereof, with a first reel-side lock portion,   the first reel-side cylindrical portion is provided at a lower surface of the first reel-side flange portion, and protrudes downward,   the second reel-side flange portion is provided at a lower end of the first reel-side cylindrical portion,   the base includes a base-side flange portion, a base-side protruding portion, and a claw,   the base-side protruding portion is provided at an upper surface of the base-side flange portion, and protrudes upward,   the claw is provided at an inner peripheral surface of the base-side protruding portion,   the reel is located on an inner peripheral side of the base-side protruding portion,   the first cover-side protruding portion is located on the inner peripheral side of the base-side protruding portion and an outer peripheral side of the first reel-side flange portion,   the ratchet gear and the claw are configured to engage with each other, and   the first cover-side lock portion and the first reel-side lock portion are configured to engage with each other.   
     
     
         2 . The fastening device according to  claim 1 , wherein
 the cover is movable upward relative to the reel and the base, and   when the cover moves upward, the first cover-side lock portion and the first reel-side lock portion disengage from each other.   
     
     
         3 . The fastening device according to  claim 1 , wherein
 the first cover-side lock portion has a recessed-raised shape, and is provided over an entirety of the inner peripheral surface of the first cover-side protruding portion,   the ratchet gear has a recessed-raised shape, and is provided over an entirety of the outer peripheral surface of the first cover-side protruding portion,   the recessed-raised shape of the ratchet gear has a dimension greater than that of the recessed-raised shape of the first cover-side lock portion, and   the claw has a dimension greater than that of the first reel-side lock portion.   
     
     
         4 . The fastening device according to  claim 1 , wherein
 the first reel-side lock portion includes first reel-side lock portions provided at an interval of 90 degrees at the outer peripheral surface of the first reel-side flange portion.   
     
     
         5 . The fastening device according to  claim 1 , wherein
 when the cover moves upward, the claw and the ratchet gear disengage from each other.   
     
     
         6 . The fastening device according to  claim 1 , wherein
 the reel includes a second reel-side cylindrical portion and a second reel-side lock portion,   the second reel-side cylindrical portion protrudes upward from a center position of the first reel-side flange portion,   the second reel-side lock portion is provided at an upper end of the second reel-side cylindrical portion, and extends to outer and inner peripheral sides of the second reel-side cylindrical portion,   the cover includes a cover-side cylindrical portion, a second cover-side protruding portion, and a second cover-side lock portion,   the cover-side cylindrical portion protrudes upward from a center position of the flat portion, and has an upper end portion,   the second cover-side protruding portion is provided at a center of a lower surface of the upper end portion, and protrudes downward,   the second cover-side lock portion is provided at an outer peripheral surface of the second cover-side protruding portion,   when the first cover-side lock portion and the first reel-side lock portion engage with each other, the second reel-side lock portion engages with an upper portion of the second cover-side lock portion, and   when the cover moves upward and the first cover-side lock portion and the first reel-side lock portion disengage from each other, the second reel-side lock portion engages with the flat portion on the outer peripheral side, and engages with a lower portion of the second cover-side lock portion on the inner peripheral side.   
     
     
         7 . The fastening device according to  claim 1 , wherein
 the base includes a retaining portion provided at the inner peripheral surface of the base-side protruding portion, and   the second reel-side flange portion is fixed to the base by the retaining portion.   
     
     
         8 . The fastening device according to  claim 1 , further comprising:
 a shaft-side flange portion;   a shaft-side protruding portion; and   a shaft,   wherein the shaft-side protruding portion is provided at a center of a lower surface of the shaft-side flange portion, and protrudes downward,   the shaft includes a shaft-side lock portion provided at an outer peripheral surface of the shaft-side protruding portion,   the cover includes a substantially circular second cover-side engagement portion,   the second cover-side engagement portion is provided at a center position of the flat portion, is elastically deformable in a radial direction, and at a center thereof, includes a second cover-side opening,   when the first cover-side lock portion and the first reel-side lock portion engage with each other, the second cover-side engagement portion engages with a lower end side of the shaft-side lock portion, and   when the cover moves upward and the first cover-side lock portion and the first reel-side lock portion disengage from each other, the second cover-side engagement portion engages with an upper end side of the shaft-side lock portion.   
     
     
         9 . The fastening device according to  claim 8 , wherein
 the shaft includes a small diameter portion and a screw hole,   the small diameter portion has a smaller diameter, and is provided lower than the shaft-side lock portion,   the screw hole is provided at a center of a lower end of the shaft-side protruding portion,   the reel includes a reel-side protruding portion,   the reel-side protruding portion is provided at an inner peripheral surface of the first reel-side cylindrical portion, and protrudes to an inner peripheral side,   the base includes a screw insertion hole at a center of the base-side flange portion, and   the screw hole is configured such that the small diameter portion is located at the reel-side protruding portion and a screw is screwed into the screw hole through the screw insertion hole.   
     
     
         10 . The fastening device according to  claim 2 , wherein
 the first cover-side lock portion has a recessed-raised shape, and is provided over an entirety of the inner peripheral surface of the first cover-side protruding portion,   the ratchet gear has a recessed-raised shape, and is provided over an entirety of the outer peripheral surface of the first cover-side protruding portion,   the recessed-raised shape of the ratchet gear has a dimension greater than that of the recessed-raised shape of the first cover-side lock portion, and   the claw has a dimension greater than that of the first reel-side lock portion.   
     
     
         11 . The fastening device according to  claim 2 , wherein
 the first reel-side lock portion includes first reel-side lock portions provided at an interval of 90 degrees at the outer peripheral surface of the first reel-side flange portion.   
     
     
         12 . The fastening device according to  claim 2 , wherein
 when the cover moves upward, the claw and the ratchet gear disengage from each other.   
     
     
         13 . The fastening device according to  claim 2 , wherein
 the reel includes a second reel-side cylindrical portion and a second reel-side lock portion,   the second reel-side cylindrical portion protrudes upward from a center position of the first reel-side flange portion,   the second reel-side lock portion is provided at an upper end of the second reel-side cylindrical portion, and extends to outer and inner peripheral sides of the second reel-side cylindrical portion,   the cover includes a cover-side cylindrical portion, a second cover-side protruding portion, and a second cover-side lock portion,   the cover-side cylindrical portion protrudes upward from a center position of the flat portion, and has an upper end portion,   the second cover-side protruding portion is provided at a center of a lower surface of the upper end portion, and protrudes downward,   the second cover-side lock portion is provided at an outer peripheral surface of the second cover-side protruding portion,   when the first cover-side lock portion and the first reel-side lock portion engage with each other, the second reel-side lock portion engages with an upper portion of the second cover-side lock portion, and   when the cover moves upward and the first cover-side lock portion and the first reel-side lock portion disengage from each other, the second reel-side lock portion engages with the flat portion on the outer peripheral side, and engages with a lower portion of the second cover-side lock portion on the inner peripheral side.   
     
     
         14 . The fastening device according to  claim 2 , wherein
 the base includes a retaining portion provided at the inner peripheral surface of the base-side protruding portion, and   the second reel-side flange portion is fixed to the base by the retaining portion.   
     
     
         15 . The fastening device according to  claim 2 , further comprising:
 a shaft-side flange portion;   a shaft-side protruding portion; and   a shaft,   wherein the shaft-side protruding portion is provided at a center of a lower surface of the shaft-side flange portion, and protrudes downward,   the shaft includes a shaft-side lock portion provided at an outer peripheral surface of the shaft-side protruding portion,   the cover includes a substantially circular second cover-side engagement portion,   the second cover-side engagement portion is provided at a center position of the flat portion, is elastically deformable in a radial direction, and at a center thereof, includes a second cover-side opening,   when the first cover-side lock portion and the first reel-side lock portion engage with each other, the second cover-side engagement portion engages with a lower end side of the shaft-side lock portion, and   when the cover moves upward and the first cover-side lock portion and the first reel-side lock portion disengage from each other, the second cover-side engagement portion engages with an upper end side of the shaft-side lock portion.   
     
     
         16 . The fastening device according to  claim 15 , wherein
 the shaft includes a small diameter portion and a screw hole,   the small diameter portion has a smaller diameter, and is provided lower than the shaft-side lock portion,   the screw hole is provided at a center of a lower end of the shaft-side protruding portion,   the reel includes a reel-side protruding portion,   the reel-side protruding portion is provided at an inner peripheral surface of the first reel-side cylindrical portion, and protrudes to an inner peripheral side,   the base includes a screw insertion hole at a center of the base-side flange portion, and   the screw hole is configured such that the small diameter portion is located at the reel-side protruding portion and a screw is screwed into the screw hole through the screw insertion hole.