Patent ID: 7780894

Claim:
An opening system for use in a tilt-up wall system, the opening system comprising: a lower bracket including a substantially planar mounting portion with apertures for mounting to a surface, a first portion extending from the mounting portion and a first lip extending from the first portion, a second portion extending from the mounting portion and a second lip extending from the second portion, the first and second lips lying in planes substantially perpendicular to the mounting portion; two corner members rigidly held in place at a selected angle, 0°<φ<180°, relative to each other, by the first and second lips of the lower bracket; spacer members configured to butt against the corner members; and lower supports configured for mounting on the surface and receiving the lower bracket adjacent to the first and second portions, the corner members and the spacer members held in a rigid position to form an opening within a tilt-up wall.