Abstract: An expandable tubular body is formed of an outer tube, an inner tube slidably fitted into the outer tube, and a device for locating the inner tube and the outer tube. The device is formed of a retaining pin, a press button, and a torsion spring. The inner tube and the outer tube are located in place by the retaining pin which is forced by the press button and the torsion spring to be stopped by the locating edges of the inner tube. The tubular can be expanded by pressing the press button to actuate the retaining pin to move away from the locating edges of the inner tube.

Abstract: A tree pruner includes a fixation seat, a cutter, a link rod, and an auxiliary rod member which is formed of a support rod and an expandable push rod. The support rod is pivoted at one end with the link rod, and at the other end with a locating hole of the cutter. The expandable push rod is pivoted at one end with the link rod, and at the other end with the support rod. The auxiliary rod member serves as an auxiliary application arm between the link rod and the cutter, so as to improve the operational efficiency of the tree pruner.