assembly 124 referring to fig6 there is shown an isolated plan perspective view of the preferred embodiment of the apparatus 100 of the present invention as used on a pipe handling system 10 the system 10 is shown in the second position with the apparatus 100 in an extended position the apparatus 100 pivots the boom 16 of the system 10 between the first and second positions the apparatus 100 has hydraulic piston and cylinder assemblies 128 connected to the boom 16 and frame 12 and pneumatic springs 102 connected to the boom 16 and frame 12 each of the pneumatic springs 102 has a piston and a cylinder the first pneumatic spring 118 has a cylinder 104 that has an end 106 pivotally connected to the boom 16 and a piston 110 movably positioned within an interior of the cylinder 104 the piston 110 has an end 112 pivotally connected to the frame 12 the second pneumatic spring 120 has a cylinder 162 that has an end 164 pivotally connected to the boom 16 and a piston 168 movably positioned within an interior of the cylinder 162 the piston 168 has an end 170 pivotally connected to the skid 12 the interior of the cylinders 104 and 162 may be filled with nitrogen gas an opposite end 114 of the piston 110 of the first pneumatic spring 118 extends within the interior of the cylinder 104 of the first pneumatic spring 118 adjacent the boom 16 when the boom 16 is in the first position an opposite end 172 of the piston 168 of the second pneumatic spring 120 extends within the interior of the cylinder 162 of the second pneumatic spring 120 adjacent the boom 16.