释义 |
three-jaw chuck
three-jaw chuck[′thrē ¦jȯ ′chək] (design engineering) A drill chuck having three serrated-face movable jaws that can grip and hold fast an inserted drill rod. three-jaw chuck
three-jaw chuck (thrē'jaw chŭk) A grasp pattern emerging in the 10th-12th month that involves holding an object with an opposed thumb and the index and middle fingers where the interphalangeal joints are slightly flexed. The ulnar fingers are slightly flexed to stabilize the radial side of the hand. |