Structural member for racks and frames - is solid or hollow, with series of spaced bolt holes permitting simple joints with minimum number of bolts

摘要

The member for constructing display stands, shelving, racks, etc., is designed to ensure rigid joints with a minimum number of bolts. It can be solid or hollow, and has equally spaced holes (7) through it, in two sets at right angles to each other, and intersecting. A right angle joint can be forward by a single bolt (12) through a horizontal and a vertical member. A corner joint with a third member extending in a horizontal plane from the vertical plane of two other connected members uses three bolts, all at right angles to each other in three planes. In this case, the horizontal member overlaps the vertical member, with a bolt passing through both. The third member then fits into the corner formed by the overlap, and is secured by two bolts at right angles to the first two members.