Patent ID: 8336719

Claim:
A rack frame comprising: a bottom frame defining a first opening on an outer side; a strengthening board fixed on the bottom frame, the strengthening board comprising: a baseboard; and an upright board extending from an edge of the baseboard; the upright board defines a third opening; and the upright board is fixed on the outer side of the bottom frame; and a strengthening leg fixed on the strengthening board, the strengthening leg comprising: a diagonal supporting portion fixed on the baseboard; and a received portion horizontally extending from a top edge of the diagonal supporting portion; the received portion is able to be received in the third and first openings; and the diagonal supporting portion defines a fourth opening configured for fixing the strengthening leg on the strengthening board by hand; wherein the diagonal supporting portion of the strengthening leg defines a supporting vane on one side; the fourth opening is trapezoidal and defined in the supporting vane; the supporting vane defines a first positioning vane toward the received portion, and a second positioning vane at the bottom; the upright board defines a first positioning slot for receiving the first positioning vane; and the baseboard defines a second positioning slot for receiving the second positioning vane.