Patent ID: 7540573

Claim:
A cabinet comprising: a hollow housing having two sides and a bottom; multiple tracks attached respectively to the sides of the housing in parallel and arranged in pairs and each track comprising a securing rail securely attached the housing and a sliding rail slidably mounted on the securing rail; multiple drawers mounted respectively and slidably between corresponding pairs of the tracks; multiple wheels attached to the bottom of the housing; a safety device mounted in the housing and comprising an elongated fixed base longitudinally attached to one side of the housing; a moving base slidably mounted on the fixed base and having a hole defined through the moving base; multiple locking blocks securely attached to the moving base and corresponding respectively to bottoms of the tracks on the side of the housing on which the safety device is mounted, and each locking block having a locking tab mounted on the locking block; multiple locking tongues mounted respectively on the drawers, corresponding respectively to the locking blocks and selectively aligning with the locking tabs on the locking blocks; multiple guiding posts mounted on the moving base and locating respectively above the locking blocks; and multiple guiding blocks slidably and respectively mounted on the tracks on the side of the housing on which the safety device is mounted, and each guiding block having a top and an inclined face defined in the top and corresponding to and selectively abutting with a corresponding one of the guiding posts; and a lock assembly attached to the housing, corresponding to the safety device and having a locking bolt rotatably extending into the hole in the moving base, wherein the movement of one of the drawers is initiated by the sliding rails and with the movement of the sliding rails, the guiding blocks are pushed to move along the inclined faces on the guiding blocks which abuts the corresponding guiding posts, the guiding posts in turn move along the inclined faces and pushes the moving base with the locking blocks upward, such that the locking tabs align and abut with the respective locking tongues on the unmoved drawers to prevent other drawers from being opened.