Vehicle restriction mechanism and vehicle carrier including the same

A vehicle restriction mechanism, configured to be disposed on a supporting arm of a vehicle carrier, including:

• a base, configured to be disposed on the supporting arm and including a sleeve portion, the sleeve portion defining an axial direction;
• and
• a stem member, adjustably and positionably disposed on the sleeve portion, the stem member being rotatable about the axial direction relative to the base between a restricted position and a release position;
• wherein the base has a first guiding portion, the stem member has a second guiding portion movably connected with the first guiding portion;
• relative to an outermost bottom surface of the base, heights of at least two parts of the first guiding portion being different in the axial direction;
• when the stem member is rotated relative to the base, the second guiding portion is moved relative to the first guiding portion and drives the stem member to move relative to the base in the axial direction;
• wherein the base further includes a first engaging portion, the stem member further includes a second engaging portion releasably engaged with the first engaging portion;
• when the first engaging portion is engaged with the second engaging portion, the base and the stem member are unmovable relative to each other;
• and when the first engaging portion is disengaged from the second engaging portion, the base and the stem member are movable relative to each other;
• wherein the first engaging portion is disposed on the sleeve portion and includes at least one engaging projection radially retractable, the second engaging portion includes at least one engaging recession recessed on an outer circumferential wall of the stem member, and the at least one engaging projection is correspondingly engaged within the at least one engaging recession.