Patent ID: 6736579
Filing Date: 2004-05-18
Classification: B25B,F16B,Y10S

Abstract:
A screw device for theft-proofing vehicle wheels comprising:a screw having a head and a threaded portion adapted to be screwable into a thread of a wheel hub via a recess arranged in a central portion of a vehicle wheel; a lock member having an endless, smoothly undulating lock groove in a first end and a coupling portion in a second end for torsionally rigid coupling to said head; a sleeve retained between said screw and said lock member after said coupling portion, and the sleeve having dimensions that position a substantial entirety of a circumference of the sleeve in close proximity with the central portion of the wheel adjacent to the recess when the threaded portion has been screwed into the thread of the wheel hub; wherein the sleeve closely encompasses a first end of the lock member; the sleeve having a first material with high resistance against crack-formation; the first end at the lock member further comprising a second material; wherein the first material is softer than the second material so that the sleeve can be deformed more easily than the first end when subjected to mechanical damage; and wherein the sleeve is dimensioned so that it can be rotated substantially freely in relation to the lock member and the screw after the coupling portion.