Radio Box Chairs

Here is one of the two seats in position, the seat belts are the silver
straps attached to the supports for the back rest.

The elongated 'O' shaped ring in the horizontal position shown above allows
the chair to rotate.  To get to the above position, pull the handle outward then
rotate 90 deg.

The pin in the base assembly is used for adjusting the height of the seat.

Note right above the 'O' handle, is the friction locking mechanism for the seat
belt (no quick release latches)

Base assembly, notice the two tie down points and the pin used to adjust the seat height.

Here is the one of the hold downs for the chairs,
the bolt slips right into the slot in the floor and
the thumb screw is tightened.