a detachable structure for mounting a cover over the bed of a pickup truck , for quick attachment without bolting . a pair of mounting brackets are provided , each including surfaces which interlock with the pickup bed side walls when placed thereon . these mounting brackets releasably engage the cover in a manner to allow pivotal movement thereof . coil springs extend between the cover and the mounting brackets to retain the brackets on the bed side walls and hold the cover in the open or closed position .