Patent ID: 6065263
Filing Date: 2000-05-23
Classification: E04B,E04C,F16B,Y10T

Abstract:
In combination,a first precast concrete block;a second precast concrete block;a first connecting rod buried in the first block so that an external threaded portion provided at an end thereof is exposed;a second connecting rod buried in the second block so that an external threaded portion provided at an end thereof is exposed;a first cylindrical tightening member having a first insertion hole arranged at one end thereof so the first connecting rod is loosely inserted into the first insertion hole at the one end of said first tightening member, said first tightening member including an external threaded portion at an outer surface thereof;a first nut screwed onto the external threaded portion of the first connecting rod, said first nut limiting the first tightening member movement in a direction toward the end of the first connecting rod;a second cylindrical tightening member having a second insertion hole arranged at one end thereof so the second connecting rod is loosely inserted into the second insertion hole at the one end of the second tightening member, said second tightening member including an internal threaded portion on an inner surface thereof, said external threaded portion of the first tightening member being screwed into the internal threaded portion of the second tightening member; anda second nut screwed onto the external threaded portion of the second connecting rod, said second nut limiting the second tightening member movement in a direction toward the end of the second connecting rod,the external threaded portion of the first tightening member being tightened into the internal threaded portion of the second tightening member, the first connecting rod and the second connecting rod being pulled toward each other to join together the first block and the second block.