Abstract: A multiple position child restraint device for use with vehicles, stretchers, cots, beds, and other transport apparatuses, and which can be folded into planar condition for storage and shipment. The restraint device includes substantially planar back support, seat support, and leg support members hingedly attached in serial relationship with one another generally along a longitudinal axis. The hinged connection between the back support and seat members is preferably provided by a pair of oppositely disposed hinges having a plurality of locking slots which align with one another at predetermined angular relationships, and wherein a locking bar fits within the aligned slots to selectively lock the back support and seat members in one of a plurality of predetermined angular orientations.

Abstract: A choke is provided having a stationary tubular flow nozzle with throttling ports formed through its side wall. A movable tubular throttling ring may be moved over the nozzle to restrict or close the ports. The required liquid-tight seal or shut-off is obtained with annular seal surfaces formed on the nozzle and ring but remote from and upstream of the ports, so that erosion of these seal surfaces, by the high velocity streams passing through the ports, is minimized.