Mechanism for limiting casters to move forwardly while towing luggage obliquely

A caster assembly mounted at either bottom corner of luggage, comprising:

• a cavity disposed in an underside of the bottom corner, the cavity including an upright front wall and a slanted rear wall;
• a wheel mount including a positioning slot in a rear of an upper portion, a vertical, central hole through the upper portion, and a lower caster;
• a bearing between the upper portion of the wheel mount and the bottom corner of luggage, the bearing including a central hole;
• a pendulum member including an upper section pivotably secured to the cavity, and a lower section, the pendulum member being upright and disengaged from the positioning slot by a predetermined distance when the luggage is upright;
• and
• fastening means for securing both the wheel mount and the bearing to the bottom corner by inserting through the hole of the wheel mount and the hole of the bearing into the bottom corner,
• whereby towing the luggage forwardly, obliquely will cause a portion the lower section of the pendulum member to enter in the positioning slot by pivoting due to gravity so as to limit the caster to move toward a forward direction.