One-touch type quick coupler for connecting steel bars

Abstract

Disclosure relates to a method of sharing a session key between wireless communication terminals using a variable-length authentication code. The method includes: generating a public key by using an own private key; generating a message including the public key and a first random number and encoding the message using an own secret key to exchange an encrypted message with the other terminal; decoding the encrypted message of the other terminal by receiving a secret key of the other terminal; generating an authentication code by calculating the first random number and a second random number included in the decoded message; obtaining a medium value from the authenticated code; and generating a session key by using a public key included in the decoded message of the other terminal.

1 . A one-touch type quick coupler for connecting steel bars  300  having left and right bodies ( 100 ,  200 ), into which ends of the steel bars  300  are inserted and fixed, and left and right grip units ( 110 ,  210 ) installed inside the left and right bodies ( 100 ,  200 ) to grip the ends of the steel bars ( 300 ),
 wherein the left and right bodies ( 100 ,  200 ) respectively include front steel bar insertion holes ( 101 ,  201 ), sidewalls ( 102 ,  202 ) and rear holes ( 103 ,  203 ), the left and right bodies ( 100 ,  200 ) have rear portions coupled to each other, each inner diameter of the sidewalls ( 102 ,  202 ) has an inclined taper shape, each outer diameter of the left and right grip units ( 110 ,  210 ) has an inclined taper shape, the inclined portions of the left and right grip units ( 110 ,  210 ) respectively cooperate with the inclined portions of the inner diameters of the sidewalls ( 102 ,  202 ) to perform wedge action, thereby compressing the steel bars ( 300 ) not to escape, each inner diameter of the left and right grip units ( 110 ,  210 ) has saw teeth ( 600 ) formed in a lengthwise direction, bottom sides of the saw teeth ( 600 ) are formed with grooves ( 601 ) for receiving joint protrusions ( 301 ) of the steel bars ( 300 ), each of the left and right grip units ( 110 ,  210 ) is divided into a plurality of pieces, the plurality of pieces are arranged radially from the steel bar insertion hole as a center, grip unit guides ( 120 ,  220 ) are correspondingly inserted between the plurality of divided pieces of the left and right grip units ( 110 ,  210 ) to form a generally circular cross section, and each of the left and right grip units ( 110 ,  210 ) has an inner diameter portion concavely rounded to grip the steel bar, both lateral surfaces convexly rounded toward the outside, and an outer diameter portion convexly rounded toward the outside to be in contact with each of the bodies ( 100 ,  200 ). 
 
     
     
         2 . The one-touch type quick coupler according to  claim 1 , wherein the groove ( 601 ) is formed to be round, so that each of the saw teeth ( 600 ) has a cross section in a “ ” shape. 
     
     
         3 . The one-touch type quick coupler according to  claim 1 , wherein the saw teeth ( 600 ) are formed in a lengthwise direction of the left and right grip units ( 110 ,  210 ) and formed at an interval of ½ of a pitch of the joint protrusions ( 301 ) of the steel bar. 
     
     
         4 . The one-touch type quick coupler according to  claim 1 , wherein rear portions of the grip unit guides ( 120 ,  220 ) are respectively connected to left and right guide plates ( 121 ,  221 ) having a plurality of small holes radially bored therethrough, and compression coil springs ( 130 ,  230 ) are respectively installed between the pieces of the left and right grip units ( 110 ,  210 ) and the guide plates ( 121 ,  221 ), so that the left and right grip units ( 110 ,  210 ) operate smoothly when the steel bars ( 300 ) are inserted and fixed. 
     
     
         5 . The one-touch type quick coupler according to  claim 1 , wherein the left and right grip units ( 110 ,  210 ) are formed with planes instead of the grooves ( 601 ). 
     
     
         6 . The one-touch type quick coupler according to  claim 5 , wherein the plane is formed with a concave-convex portion ( 602 ) by knurling, thereby enhancing contact area and pressure with a steel bar. 
     
     
         7 . The one-touch type quick coupler according to  claim 1 , wherein a step is formed on a steel bar-side end of each outer diameter of the left and right grip units ( 110 ,  210 ) and a corresponding step is formed on each inner diameter of the left and right bodies ( 100 ,  200 ), so that when the steel bar ( 300 ) is pulled, pressure applied between the left and right grip units ( 110 ,  210 ) and the left and right bodies ( 100 ,  200 ) can be dispersed. 
     
     
         8 . The one-touch type quick coupler according to  claim 1 , wherein a steel bar-side end of each outer diameter of the bodies ( 100 ,  200 ) is formed to be inclined, thereby sufficiently filling mortar without pores or empty spaces when concrete construction is performed. 
     
     
         9 . The one-touch type quick coupler according to  claim 1 , wherein the left and right bodies ( 100 ,  200 ) with the left and right grip units ( 110 ,  210 ) housed therein are separated from each other and used in sole, and the separated left or right body is threadedly coupled to a wall to attach the steel bar ( 300 ) to the wall or coupled to a hollow pipe in the shape of a tee T, a cross + or an elbow L and thus used to connect the steel bars ( 300 ).