Mechanic's creeper

Claim 1

A creeper for supporting the body of a worker and facilitating movement of the worker under and around an object such as an automobile, the creeper comprising: a platform having a top surface and an underside; four corner casters mounted on the underside of said platform for spacing the platform above a generally flat horizontal floor and for facilitating rolling of the platform on the floor, said casters being so spaced with respect to said platform that lines connecting adjacent casters define a quadrangle with a corresponding caster at each corner of the quadrangle; a fifth caster mounted on the underside of said platform within a central portion of said quadrangle; said corner casters and fifth caster being adapted for simultaneously contacting the floor and supporting the platform when the worker rests upon the top surface of the platform; and said platform being resiliently flexible and adapted, upon accepting the weight of a person, to flex from a relaxed position in which an intermediate region of the platform between opposite ends of the platform is spaced a first distance above the floor, to a flexed position in which the platform bows downwardly and the intermediate region is spaced a second distance above the floor less than said first distance.