Chalk clamp

Chalk clamp is including screw rod, end cover and pen container to the axis direction of pen container is controlling the horizontal direction, and end cover threaded connection has seted up the through -hole at the right -hand member of pen container on the end cover, and the left side of end cover is fixed and is equipped with the swivel nut, and swivel nut, through -hole and pen container coaxial line set up, and the screw rod is worn to establish in swivel nut and through -hole, screw rod and swivel nut threaded connection, and the left end of screw rod is fixed and is equipped with the roof, and the right -hand member of screw rod is fixed and is equipped with the handle, the fixed elastic sleeve that is equipped with of the inner wall of pen container, the thickness of elastic sleeveincreases from a dextrad left side in proper order, to sum up, the utility model has the advantages of reasonable design, pressing from both sides and getting respectively firmly, the teacher is utilizing this alignment clip