Adjustable angle shelf bracket

A bracket assembly, comprising:

• a bracket comprising a shelf support surface;
• a first projecting portion extending from an attachment side of the bracket, the first projecting portion including a single notch;
• a second projecting portion extending from the attachment side of the bracket, wherein the second projecting portion includes a proximal notch and a distal notch, the single notch in the first projecting portion and the proximal notch in the second projecting portion are positioned on a first line at a first angle, and the single notch in the first projecting portion and the distal notch in the second projecting portion are positioned on a second line at a second angle;
• a third projecting portion extending from the attachment side of the bracket, the third projecting portion including a distal notch and a proximal notch, where the proximal notch in the second projecting portion and the proximal notch in the third projecting portion are positioned on the first line at the first angle and the distal notch in the second projecting portion and the distal notch in the third projecting portion are positioned on the second line at the second angle;
• an adjustment structure comprising a first side moveable between a first position and a second position, wherein the first side is on the first line with the proximal notch of the second projecting portion and the proximal notch of the third projecting portion at the first angle to form a side of the single notch in the first projecting portion when the adjustment structure is in the first position, and the first side is on the second line with the distal notch of the second projecting portion and the distal notch of the third projecting portion at the second angle to form the side of the single notch in the first projecting portion at the second angle when the first side is in the second position, wherein the first angle is different from the second angle;
• and
• a locking structure configured to prevent movement of the adjustment structure when the adjustment structure is in the first position and the second position, wherein the locking structure comprises a button configured to extend at the same time through a first locking hole in the bracket and a first locking hole in the adjustment structure to prevent rotation of the adjustment structure with respect to the bracket when the adjustment structure is in the first position or the second position.