Work device and its moveable claw

A vice for mounting on an elongated base comprising a slide guide mounted on said base in parallel longitudinal directions:

• a first moving base having an upper portion and a lower leg portion, said lower leg portion slidably attached to said slide guide;
• a second moving base capable of moving in an advancing direction of said first moving bases, being separated from said first moving base and sent out toward an advancing direction of said first moving base by a feed screw means attached to said first moving base for advancing and retracting said second moving base relative to said first moving base;
• a plurality of cooperating positioning means arranged at a predetermined pitch in said elongated base and the lower surface of said second moving base to selectively position said first moving base;
• a movable claw arranged on an advancing direction side of said second moving base and gripping one end of a work;
• and
• an arched roof portion integrally formed with an upper portion of said second moving base and extending over the upper portion of said first moving base, a lower face of said roof portion slidably coming in contact with said first moving base forming a sliding face parallel to said slide guide said roof portion protecting said first and second movable bases from entry of foreign material.