| 摘要 |
<p>The invention provides a work bench comprising a frame (12) and a table surface connected to the frame. The table surface includes at least two members (24,26), one of which (26) is movably coupled with the frame to enable clamping of a workpiece between the two table surface members. A drive mechanism moves one of the table members with respect to the other table member. The drive mechanism comprises a first screw (30) coupled with the movable member, a second screw (30) coupled with the movable member and spaced apart from the first screw, a first screw sprocket (38) coupled with the first screw, a second screw sprocket (38) coupled with the second screw and an intermediate shaft (35) carrying a first and second intermediate sprocket (36), wherein each intermediate sprocket has a larger diameter than the respective screw sprocket. The drive mechanism also comprises a first transmission belt or chain (40) coupling the first screw sprocket to the first intermediate sprocket and a second transmission belt or chain (41) coupling the second screw sprocket to the second intermediate sprocket, and the drive mechanism is arranged such that the movable member may be moved by turning the intermediate shaft. The drive mechanism reduces the time required to drive the screws.</p> |
