Miter box construction with clamp means

A mitre box comprising a rectangular bottom wall having a flat top surface, opposed vertical side walls extending from opposite longitudinal end edges of said bottom wall, and clamping means independently displaceable between said vertical side walls to apply clamping pressure on a workpiece lying on said top surface against either one of said side walls, said clamping means having a flat clamp plate having opposed clamping surfaces and extending transversely above said top surface with said clamping surfaces parallel to said side walls, a threaded bolt extending across said opposed vertical side walls and axially rotatable relative thereto, said bolt being in threaded engagement with a threaded bore in said clamp plate and being disposed below said flat top surface, and a flat plank secured on said flat top surface intermediate the ends of said rectangular bottom wall, there being a clamp plate adjacent each end edge of said plank and extending above a flat top surface thereof, said threaded bolt of each clamp plate extending above said rectangular bottom wall top surface and below said plank top surface.