US Patent 7866009 Wedges for sheathing lock system

A wedge for retaining a tendon in an anchor has first, second, third, and fourth portions. The portions each have a channel. The first portion has a constant thickness from a first end to a second end. The second portion has a first end adjacent to the second end of the first portion and tapers from the first end of the second portion to a second end thereof. The third portion has a first end adjacent to the second end of the second portion and tapers from the first end of the third portion to a second end thereof. The fourth portion has a first end adjacent to the second end of the third portion and tapers from the first end of the fourth portion to a second end thereof. The channels of each of the portions have ribs.