Tool connecting device for robot hand

A tool connecting device for robot hands comprising:

• a master plate connectable to a hand section of a robot hand;
• a tool plate connectable to a tool;
• a piston member movably supported by said master plate and slidable between a locked position and an unlocked position;
• a retainer fixed to said master plate and extending along an outer perimeter of an output section of said piston member;
• a plurality of roller members;
• a plurality of retainer openings formed in said retainer;
• said roller members being supported in said plurality of retainer openings of said retainer and movable in a direction perpendicular to a direction in which said piston member slides;
• a plurality of engagement sections formed on said tool plate;
• said plurality of engagement sections engageable with said plurality of roller members;
• each of said plurality of roller members having a pair of projections disposed at central regions of side surfaces perpendicular to the axis of said roller member;
• and
• said plurality of retainer openings having guide grooves formed on an inner surface of said retainer openings to prevent said pairs of projections of said plurality of roller members from falling out.