| 摘要 |
A dimensional adjusting device for computer keyboard racks including a displacement device, a rotary device, a connecting plate, an elevating device, an elevation device, and a positioning device. The invention is characterized in that a relay plate is disposed between a fixed track and movable track of one of two slide track units, the relay plate being connected to the movable track and having two plate wings at both sides thereof. The plate wings pass through corresponding track holes in the movable track to be further connected to a plate flap at either side of a fixed plate. The invention is further characterized in that the fixed plate has a positioning device disposed therein. The positioning device is comprised of a bottom cover disposed over a front portion of the fixed plate, and two trigger pieces. The bottom cover has a partition rib defining a clearance with a front wall of the bottom cover for receiving two oppositely disposed rods with a spring sandwiched therebetween. The rods each have a projection at an upper side and a stop portion at the other side. The bottom cover further has two cover posts at both sides behind the partition rib. The trigger pieces have respective pins, notches and end notches. The pins of the trigger pieces pass through corresponding through slots at a front edge of the fixed plate such that the notches engage the projections of the rods and the end notches engage the cover posts of the bottom cover. The positioning device further comprises a top cover for sealing the bottom cover so that the rods may advance along the fixed tracks during displacement, and are positioned in place when the rods pass over the fixed tracks to extend outwardly.
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