Impact drill

An impact drill, comprising:

• an output shaft capable of rotating around a first axis and moving along the first axis;
• a housing comprising an accommodating portion for accommodating at least a part of the output shaft;
• a first impact block fixedly connected to the output shaft;
• a second impact block arranged in the housing;
• an elastic member configured to have an elastic force that makes the first impact block and the second impact block separate from each other;
• a stopping element sleeved on the output shaft and comprising an annular portion and a plurality of protrusions, a front end of the stopping element abuts a bearing connected to the output shaft for selectively stopping the output shaft from moving backward along the first axis;
• and
• a movable element mounted on the housing;
• wherein the housing is formed with a through hole for accommodating at least a part of the movable element, the through hole passes through the housing in a first line, the movable element is capable of moving to a first position and a second position along the first line, when the movable element moves to the first position along the first line, the movable element abuts against a rear end of the at least one of the plurality of protrusions of the stopping element to prevent the output shaft from moving backward, and, when the movable element moves to the second position along the first line, the movable element disengages with the stopping element to allow the output shaft to move backward, and
• wherein the movable element is a pin with a head having an outer diameter larger than the diameter of the through hole to seal the through hole.