Abstract: A worktable sliding block positioning mechanism includes abuse member pivotally connected to a sliding block, a first clamping block affixed to the base member and defining a first clamping end that is disposed at one side relative to the worktable, a second clamping block pivotally connected to the base member and defining a second clamping end that is disposed at an opposite side relative to the worktable and opposite to the first clamping end, and a drive wheel pivotally connected to the base member and rotatable by an external force and defining a press portion that is pressed on the second clamping block to move the second clamping end toward the first clamping end of the first clamping block upon a rotary motion of the drive wheel. Thus, the worktable sliding block positioning mechanism avoids deformation or displacement of the sliding block during its positioning.

Abstract: A windows opening/closing driving device is mounted on a building and connected with a plurality of windows, including driving means fixed on the building, returning means fixed on the building, a rope passing by the windows and having two ends respectively connected with the driving means and the returning means, and a plurality of connecting members each having two connecting portions respectively connected with the rope and one of the windows.