Mechanical hand with movable gripping members

A hand comprising:

• a hand body;
• a first slider and a second slider which are guided by a rail of the hand body via rolling members such that the first and second sliders are linearly movable in opening and closing directions;
• a first gripping member and a second gripping member which are fixed on the first and second sliders respectively and which are capable of gripping an object;
• a drive source arranged in the hand body;
• a rotating plate driven to rotate by the drive source;
• a first clamping link directly connected to the rotating plate so as to enable only rotation on a first shaft and directly connected to the first slider without a spring interposed therebetween so as to enable only rotation on a second shaft and so as not to be slidable;
• and
• a second clamping link directly connected to the rotating plate so as to enable only rotation on a third shaft and directly connected to the second slider without a spring interposed therebetween so as to enable only rotation on a fourth shaft and so as not to be slidable,
• wherein the drive source rotates the rotating plate so that the first and second gripping members linearly move in the opening and closing directions, and
• wherein, when the first and second gripping members grip an object, the first to fourth shafts line up on the straight line in an order of the second shaft, the third shaft, an axis line of the rotating plate, the first shaft, and the fourth shaft, and the first and second gripping members are at a most close position to each other, and thereafter
• the rotating plate rotates until a center of the third shaft moves beyond a line connecting the axis line of the rotating plate and a center of the second shaft and a center of the first shaft moves beyond a line connecting the axis line of the rotating plate and a center of the fourth shaft, and the first and second gripping members lock the object for gripping while being in a wider open state than the most close position to each other.