Abstract: A circular saw machine has a workpiece support and a clamping means consisting of a clamping arm and a clamping block for clamping workpieces; the clamping means is displaceable and clampable in a shaped groove with the aid of sliding members. The sliding members have first inclined faces and slide on corresponding second inclinded faces of the clamping block. Their slide movement may be initiated by means of a screw spindle connecting the two sliding members. When the sliding members slide upwards the clamping means is firmly clamped in the shaped groove. When they slide in the opposite direction clamping is released.

Abstract: Circular saw apparatus is disclosed of the type including saw frame means pivotally connected with a base for pivotal movement between a normal non-cutting position and a cutting position, characterized by the provision of safety locking means for releasably locking the saw frame in the non-cutting position. The locking means includes a stationary locking member connected with the base, a movable locking member movably connected with the saw frame, and spring means normally biasing the movable locking member into engagement with a locking surface on the stationary locking member. Releasing means are provided for releasing the movable locking member from engagement with the locking surface, said releasing means being associated with the hand lever means provided for swinging the saw frame toward the cutting position.