Occupant's side holding device for the seat back of a seat

An occupant's side holding device for a seat back of a seat in which occupant's body side holders are rockable in a lateral direction of the seat back at both a right side and a left side of the seat back, said device comprising:

• a frame on each one of said occupant's side holders;
• vertical operating shafts rotatable around their own axes at both a right side and a left side of a seat back frame;
• a rockable arm secured to one of said operating shafts;
• a nut pivotally secured to said rockable arm;
• a threaded shaft rotatably journaled to the seat back frame and extending toward the lateral inside of the seat back;
• the threaded part of said threaded shaft being engaged with the threaded hole of said nut;
• said rockable arm and said operating shafts being integrally formed and being rocked in the lateral direction of said seat back upon rotation of said threaded shaft;
• an interlocking member arranged between said operating shafts for rotating the other operating shaft symmetrically with respect to said one operating shaft;
• fitting members integrally secured to said operating shafts for securing both said operating shafts to suitable positions on the frames of said occupant's side holders;
• and
• a handle provided at an outside end of said threaded shaft.