Winding device

Abstract

A winding device includes a winding member that rotates to wind a flexible member therearound, a first rotating member that is rotatable, a second rotating member that is rotatable coaxially with the winding member and has a smaller resistance to rotation in a predetermined direction than that to rotation in a direction opposite the predetermined direction, and an engaging member. When the first rotating member is subjected to a first torque, the engaging member brings the winding member, the first rotating member, and the second rotating member into engagement with one another, so that the winding member becomes rotatable together with the first rotating member in the predetermined direction. When the first rotating member is subjected to a second torque in a direction opposite that of the first torque, the engaging member releases the engagement, so that the winding member becomes rotatable in the direction opposite the predetermined direction.

1 . A winding device comprising:
 a winding member configured to rotate to wind a flexible member therearound;   a first rotating member configured to be rotatable;   a second rotating member configured to be rotatable coaxially with the winding member, and having a smaller resistance to rotation in a predetermined direction than that to rotation in a direction opposite the predetermined direction; and   an engaging member configured to bring the winding member, the first rotating member, and the second rotating member into engagement with one another when the first rotating member is subjected to a first torque, so that the winding member becomes rotatable together with the first rotating member in the predetermined direction, the engaging member being configured to release the engagement when the first rotating member is subjected to a second torque in a direction opposite that of the first torque, so that the winding member becomes rotatable in the direction opposite the predetermined direction.   
     
     
         2 . The winding device according to  claim 1 , wherein the engaging member is located between the winding member and the second rotating member. 
     
     
         3 . The winding device according to  claim 1 , wherein when the amount of rotation produced by the second torque is greater than a predetermined amount, the engaging member brings the winding member, the first rotating member, and the second rotating member into engagement with one another. 
     
     
         4 . The winding device according to  claim 1 , wherein the engaging member has a wedge shape. 
     
     
         5 . The winding device according to  claim 1 , wherein the first rotating member has a cylindrical shape. 
     
     
         6 . The winding device according to  claim 1 , wherein the engaging member is connected to the first rotating member,
 wherein the second rotating member has a polygonal contour, and   wherein rotation of the first rotating member causes the engaging member to be inserted into a gap between the second rotating member and the winding member at positions near vertices of the polygon, so that the engaging member brings the winding member, the first rotating member, and the second rotating member into engagement with one another.   
     
     
         7 . The winding device according to  claim 1 , wherein the winding member is biased in a direction to loosen the wound flexible member, and
 wherein when the engagement made by the engaging member is released, the wound flexible member is loosened.   
     
     
         8 . The winding device according to  claim 1 , wherein the second rotating member increases the resistance to rotation in the direction opposite the predetermined direction, and prevents the winding member engaged with the second rotating member from rotating in the direction opposite the predetermined direction. 
     
     
         9 . The winding device according to  claim 1 , wherein the flexible member is a wire member used to fasten a mounting member of head-mounted type, and
 wherein rotation of the first rotating member fastens or unfastens the mounting member.