Abstract: A ballscrew assembly may comprise a ballscrew having an axially distributed ballscrew groove about an interior circumference of the ballscrew, an extended top plate having an axially distributed extended top plate groove disposed on an outer circumference of the extended top plate, and an axially distributed thrust bearing. Further, a ballnut assembly may comprise a ballnut having an axially distributed ballnut groove about an interior circumference of the ballnut, an extended top plate having an axially distributed extended top plate groove disposed on an outer circumference of the extended top plate, and an axially distributed thrust bearing. Further still, a ballnut assembly may comprise a ballnut having an axially distributed ballnut groove about an outer circumference of the ballnut, an extended top plate having an axially distributed extended top plate groove disposed on an interior circumference of the extended top plate and an axially distributed thrust bearing.

Abstract: A cutter guard device is adapted for use in a belt saw machine, and includes a stationary hinge leaf formed with a first knuckle unit, a movable hinge leaf formed with a second knuckle unit, and a hinge pin extending through the first and second knuckle units, thereby permitting rotation of the movable hinge leaf between cutter concealing and cutter exposing positions. The movable hinge leaf is further slidable along the hinge pin between retaining and pivoting positions. The movable hinge leaf is movable between the cutter concealing and cutter exposing positions when disposed in the pivoting position on the hinge pin. A retention unit retains releasably the movable hinge leaf in the cutter concealing position when the latter is further disposed in the retaining position on the hinge pin.

Abstract: A hand tool is fitted with a fixed shield and a movable shield which is rotatably mounted around the fixed shield. The two shields are aligned with one another by each shield being keyed into a countersunk washer formed with an anchor slot for the fixed shield and a semi-annular guideway for the movable shield. A torsion spring normally biases the movable shield into a closed position about the fixed shield.