Length-adjustable wrap film dispenser

A length adjustable wrap film dispenser, comprising:

• an outer tube member comprising a sleeve connection portion, a first bearing portion and a first engagement portion, said sleeve connection portion defining a through hole axially extending through two opposite ends thereof, said first bearing portion extending axially outwardly and expanding gradually outwardly from one end of said sleeve connection portion, said first engagement portion being formed on the periphery of said through hole;
• and
• an inner tube member comprising an insertion portion, a second bearing portion and a second engagement portion, said insertion portion having a polygonal cross section, said second bearing portion extending axially outwardly and expanding gradually outwardly from one end of said insertion portion, said second engagement portion being formed on the periphery of said insertion portion;
• wherein said insertion portion of said inner tube member is axially movably inserted into the through hole of said sleeve connection portion of said outer tube member, and rotatable relative to said outer tube member between an engaged position where said second engagement portion of said inner tube member is engaged with said first engagement portion of said outer tube member to prohibit relative axial displacement between said inner tube member and said outer tube member, and a disengaged position where said second engagement portion of said inner tube member is separated from said first engagement portion of said outer tube member for enabling said inner tube member to be moved axially relative to said outer tube member by an external force;
• wherein said first engagement portion of said outer tube member is axially formed of a plurality of blocks protruding outwardly relative to the periphery of said through hole and spaced along the length of said outer tube member at a predetermined pitch;
• said second engagement portion of said inner tube member is axially formed of a plurality of blocks protruding from the periphery of said insertion portion and spaced along the length of said inner tube member at a predetermined pitch;
• wherein said engagement portion of said inner tube member includes a flat surface axially extending along said inner tube member and beside said blocks.