Patent ID: 7836584

Claim:
A jig for tightening a bolt, comprising: a support unit configured to stand on a floor of a work place and extend toward a bottom side of a car body which is conveyed by an overhead hanger; a movable unit connected to the support unit so as to be movable in a transverse direction of the car body, a longitudinal direction of the car body, and a height direction of the car body; a fastening part disposed in the movable unit to fasten chassis components to the bottom side of the car body; a load compensating part compensating load of the fastening part when the fastening part ascends/descends toward/from the bottom side of the car body; a tilting part adjusting a position of the fastening part; and a reaction force regulating part sustaining reaction force that is generated while the fastening part is operated; wherein the movable unit comprises a longitudinally movable part which moves the fastening part along the longitudinal direction of the car body with respect to the support unit, a vertically movable part which moves the fastening part along the height direction of the car body with respect to the support unit, and a transversely movable part which moves the fastening part along the transverse direction of the car body with respect to the support unit; wherein the transversely movable part comprises: an arm comprising a first end coupled with the vertically movable part so as to be rotatable with respect to the vertical axis; a roll link shaft comprising a first end coupled with the arm at a second end of the arm so as to be rotatable with respect to the vertical axis; and a tool housing link comprising an end coupled with the roll link shaft at a second end of the roll link shaft so as to be rotatable with respect to a transverse axis; wherein the reaction force regulating part comprises: a receiving surface which is inclined with respect to a horizontal plane at a coupled part of a leading end of the roll link shaft; and an engaging surface which protrudes in a horizontal direction so as to correspond to the receiving surface at a coupled part of a leading end of the tool housing link.