Safe fastener for curtain

Abstract

A fastener is provided for fastening ropes. The fastener includes first unit and a second unit. The first unit is made of a hollow configuration and made with elastic strips. Each of the elastic strips includes a barb formed thereon. The second unit includes a waist extending from a block to a disc. Cutouts are defined in the block. The second unit is kept in the first unit as the block or the disc is engaged with the barbs. Each of the ropes includes a knot placed in an annular space defined between the first unit and the waist and a section inserted through a respective one of the cutouts. The block or the disc is disengaged from the barbs when the ropes are loaded with adequate tensile stress.

1 . A fastener for fastening ropes, wherein the fastener includes:
 a first unit made of a hollow configuration and made with elastic strips, each including a barb formed thereon; and   a second unit including a block, a disc, a waist extending from the block to the disc, and cutouts defined in the block, wherein the second unit is kept in the first unit as one of the block and the disc is engaged with the barbs, wherein each of the ropes includes a knot placed in an annular space defined between the first unit and the waist and a section inserted through a respective one of the cutouts, wherein the one of the block and the disc is disengaged from the barbs when the ropes are loaded with adequate tensile stress.   
     
     
         2 . The fastener according to  claim 1 , wherein the cutouts are defined in the periphery of the block, wherein each of the cutouts includes an open end that is closed by the first unit when the second unit is placed in the first unit. 
     
     
         3 . The fastener according to  claim 1 , wherein the first unit includes an aperture defined therein at an end, wherein the second unit includes a boss inserted in the aperture when the second unit is placed in the first unit. 
     
     
         4 . The fastener according to  claim 1 , wherein the first unit includes slits defined therein, wherein each of the elastic strips is formed between any two adjacent ones of the slits. 
     
     
         5 . The fastener according to  claim 4 , wherein the slits are defined in an upper section of the first unit, wherein the second unit is kept in the first unit as the block is engaged with the barbs. 
     
     
         6 . The fastener according to  claim 5 , wherein the block includes a chamfer for engagement with the barbs. 
     
     
         7 . The fastener according to  claim 4 , wherein the slits are defined in a lower section of the first unit, wherein the second unit is kept in the first unit as the disc is engaged with the barbs. 
     
     
         8 . The fastener according to  claim 7 , wherein the disc includes an upper chamfer on which the barbs slide when the first unit is removed from the second unit. 
     
     
         9 . The fastener according to  claim 7 , wherein the disc includes a lower chamfer on which the barbs slide when the first unit is moved onto the second unit. 
     
     
         10 . The fastener according to  claim 1 , wherein the second unit includes a bore defined therein, wherein the bore includes a smaller section and a larger section for receiving a knot of another rope. 
     
     
         11 . The fastener according to  claim 1 , wherein the second unit includes two ribs formed on the waist for reinforcement.