US Patent 10428849 Radially expanding post extender

A post coupler expands laterally. The post coupler includes a first member that is hollow and has a first slanted face. A second member is also hollow and has a second slanted face that is abutted with the first slanted face. A rod extends through the first and second members; the rod has a head that is disposed at a head end and threads disposed at a thread end. A nut is engaged with the threads, and rotating the nut causes the first member to extend in a first lateral direction and causes the second cylindrical member to extend in a second lateral direction opposite the first radial direction.