The present invention comprises a quick release tank support bracket having a positive locking engagement along with an optional operative seat back supportive assembly which includes support bars mounted with a frame with clamp arms secured to the support bars. At least two such support bars are included with at least one or more clamp arms secured thereto. The clamp arms are movable between a closed position for retaining of a tank therein and an opened position for releasing of the tank therefrom. Each of the support bars includes a crank arm which is interconnected by an inner engagement device for controlling cooperative relative movement of the two clamp arms with respect to one another. Closure lugs are positioned integral with the clamping arms and extend inwardly and include tank engaging surfaces such that when the tank is inserted into place by pushing horizontally toward the backing plate and the clamping arms and the support rods will automatically move to the tank retaining position. Also simultaneously the seat back members which are secured to the clamping bars will move together to form a rear seat cushion area for a conventional seat as may be used ON emergency vehicles such as fire trucks and the like.
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