Sheet retainer with over-centre action

摘要

The retainer includes a web 3a that buckles between positions Xc and Xr at which a corner or side of a sheet P on a base 2 is fixed or released, the web having a knob 17 for manual movement between the positions. The movement may be perpendicular (Fig 1) or parallel (Fig 11) to the base. The base may be a drawing board, file or clip board.