Abstract: A socket wrench modified by the addition of auxiliary gripper ribs to either prevent bolt head stripper action or to minimize the adverse effects of such stripper action. In one case the bolt head is initially formed to have grooves in its side surfaces mated to gripper ribs on the wrench. In an alternate arrangement the gripper ribs are designed as cutter devices to form grooves in the bolt side surfaces by the application of a hammering force on the wrench.

Abstract: A vehicle wheel-tire assembly wherein the tire has a low inflation pressure (large tire footprint) in a low vehicle speed range, and a large inflation pressure (small tire footprint) in a high vehicle speed range. The tire is partitioned into a series of circumferential compartments, with each compartment being provided with a valve mechanism for introducing air into the compartment and/or withdrawing air from the compartment as needed to maintain desired inflation pressures in the different vehicle speed ranges. The system is contained entirely in the wheel-tire assembly; no external air compressors or control valves are utilized.