Patent ID: 8453566

Claim:
A frame for stretching screen fabric, the frame comprising: a rigid frame including four sides surrounding a center, each side of the frame including: a first, second and third side groove; a first step including the second side groove disposed on an external side of the first step distal the center of the frame; a second step including the third side groove disposed on an external side of the second step distal the center of the frame, the first step disposed between the center of the frame and the second step; a movable frame member including an asymmetric locking strip slot and a first and second projection, the asymmetric locking strip slot configured to receive a locking strip and the screen fabric, the first and second projection configured to engage the first and second side groove, respectively, for holding the movable frame member on the first step during insertion of the locking strip and screen fabric into the asymmetric locking strip slot, the first and second projection also configured to engage the second and third side groove, respectively, for holding the movable frame member on the second step while the screen fabric is stretched; and a ridge disposed on the rigid frame between the first step and the center of the rigid frame, the first side groove disposed between the ridge and the first step, the ridge configured to support the stretched screen fabric while the movable frame member is disposed on the second step.