The present invention relates to one kind to grab a bag device( 10 )It is mounted on sliding rail( 100 )Rectangular cross section station,With main body( 12 )With at least one bearing surface( 46 )It is designed to towards sliding rail( 100 ),Fixture( 14 )It is mounted on main body( 12 )With the first supporting member( 20 )With the second supporting member( 38 ),Component( 10 )It is connected to clamp structure to 0 being run property( 10 )1 He( 10 )2 whose actuating allow clamp structure by locked state,Wherein polar bear surface( 10 )3 main body( 10 )4 and bearing element( 10 )5,( 10 )6 towards sliding rail clamp structure( 10 )7 ( 10 )8,Wherein the first load-carrying unit( 10 )9 are pivotably mounted around the first pivot axis(Z axis)Parallel longitudinal axis X sliding rails( 100 )It 0 and is fixed,Relative to main body( 100 )1,Second supporting member( 100 )2 are pivotably mounted around the second pivot axis(Y-axis)It is parallel to the first pivot(Z axis)It can be relative to main body with these surfaces( 100 )3,With actuating member( 100 )4 ( 100 )5 are operably connected to the second supporting member,First supporting member( 100 )6,?( 100 )7,It can be relative to the first pivot axis to activate the actuating component(Z axis)So as to towards sliding rail( 100 )8.