Patent ID: 8231088

Claim:
A tripod having a main bracket ( 1 ) and at least one stand leg, each stand leg including an upper segment, a middle segment and a lower segment, the upper segment is connected to the main bracket ( 1 ), the middle segment is telescopically connected to the upper segment at a first joint, the lower segment is telescopically connected to the middle segment at a second joint, the upper segment including at least an upper leg tube ( 5 ), the lower segment including a lower leg tube ( 9 ), and the middle segment including a movable connector ( 10 ), a lower connector ( 16 ) and at least one middle leg tube ( 8 ) connected there between, the movable connector ( 10 ) is slidable along the upper leg tube ( 5 ) and the lower leg tube ( 9 ) passes through the lower connector ( 16 ) a locking unit provided at the first and second joints and configured to simultaneously fix the lower segment to the middle segment and the middle segment to the upper segment, the locking unit includes a rotation lever ( 2 ), a locking screw ( 21 ), a position adjustor ( 18 ), a cam ( 12 ) and a clamping piece ( 6 ), the rotation lever ( 2 ) is provided at the outer side of the movable connector ( 10 ), the locking screw ( 21 ) passes through the position adjustor ( 18 ), the movable connector ( 10 ), the cam ( 12 ) and the clamping piece ( 6 ), and is connected securely to the rotation lever ( 2 ) at its one end and is connected to the clamping piece ( 6 ) at the other end; the surface of the position adjustor ( 18 ) facing to the rotation lever ( 2 ) gradually rises along the circumferential inclined plane direction, while being rotated the rotation lever ( 2 ) is simultaneously risen from low to high by the circumferential inclined plane surface of the position adjustor ( 18 ), which in turn drives the clamping piece ( 6 ) to move in the same direction, and thus the clamping piece ( 6 ) gradually comes close to the upper leg tube ( 5 ) passing through the movable connector ( 10 ) and locks the upper leg tube ( 5 ) in position eventually; and a safety device operatively connected to the locking unit, the safety device having a stop rod that engages the locking unit and is moveable between an engaged position and a disengaged position when the locking unit is in a locking position, wherein in the engaged position the locking unit is locked from moving to an unlocking position.