Positioning apparatus for seat headrest posts in vehicle

A positioning apparatus for seat headrest posts in a vehicle, comprising:

• a retractable rod having an extendible rod able to extend and retract in a linear direction;
• a locking assembly disposed on an outer surface of the retractable rod, the locking assembly fastening a position of the extendible rod after a lateral adjustment of the retractable rod;
• at least two clamping units disposed on the retractable rod for clamping onto the seat headrest posts, each clamping unit including:
• a main clamping element having an arc-shaped clamping area;
• a movable clamping element attached to the main clamping element and being movable in only the linear direction and parallel to the retractable rod, the movable clamping element having an arc-shaped clamping area;
• and
• a rotatable dial knob that causes the movable clamping element to move linearly when the rotatable dial knob is rotated, so that the clamping area of the main clamping element and the clamping area of the movable clamping element clamp a respective seat headrest post therebetween;
• and
• a connection joint unit detachably disposed at an end of the extendible rod for engaging an object to be mounted thereon, and comprising:
• a fixed base having a sphere carrier base, and an engagement end;
• a dial locking element disposed at the sphere carrier base, and being rotatable;
• a position adjustment element having a spherical-shaped end disposed in the sphere carrier base, the position adjustment element being locked in position in the sphere carrier base when the dial locking element is rotated:
• a buckle element disposed on another end the position adjustment element distal from the spherical-shaped end;
• and
• a buckle block disposed at the end of the extendible rod, and having a shape matching a shape of the engagement end, the buckle block being engagable with the engagement end of the fixed base, so that the connection joint unit is detachably mountable to the end of the extendible rod.