Telescoping shoe plate structure

A telescoping shoe plate structure, comprising:

• an upper shoe plate having an upper guide portion on a surface of the upper shoe plate, a front portion and a rear portion in the long direction of the upper shoe plate, a first moving portion on one side of the front portion, and a second moving portion on the other side of the front portion;
• the rear portion having an upper clamping member;
• and the upper shoe plate being combined with a pushing member for pushing the upper shoe plate;
• and
• a lower shoe plate having a lower guide portion on a surface of the lower shoe plate, the lower guide portion being connected to the upper guide portion for the upper shoe plate and the lower shoe plate to extend and retract in a relatively straight direction;
• and the lower shoe plate having a lower clamping member, and the lower clamping member being connected to the upper clamping member for positioning the upper shoe plate and the lower shoe plate.