100 102 and 104 to the desired location notice that the second tab 86 is still engaged in the detent 48 thus preventing rotation or swiveling of the seat fig4 shows the seat in a position as it is rotated from a forward facing position to a rearward facing position in this case the handle 90 has been raised far enough to free the second tab from the detent 48 as well as the notches 136 and the operator has rotated the seat 180 u00b0 in fig4 the second tab 86 is significantly elevated above the rear facing upwardly extending member 44 however in a more typical situation the operator would release the handle 90 while rotating the seat the second tab 86 would then ride up along the ramp of the member 44 until the second tab 86 falls into the detent this is analogous to the operation of the striker plate aspects of a conventional door latch the spring 92 ensures that the latch arm 80 remains in a proper horizontal position when both tabs are in respective notches or detents the closeness or spacing between the upper and lower angle section components is just slightly greater than the overall diameter of the rollers housed there between this allows the rollers to act on the lower and on the upper angle section components when the horizontal rail frame 106 is at an extreme horizontal position the rollers closest to the near end of the horizontal rail frame will be in primary contact with the upper angle.