Vehicle wheel lug nut apparatus

• US 4,211,128 A
• Filed: 07/17/1978
• Issued: 07/08/1980
• Est. Priority Date: 07/17/1978
• Status: Expired due to Term

• Current Assignee: Mark J. Plumer
• Original Assignee: Mark J. Plumer
• Inventors: Plumer, Mark J.
• Primary Examiner(s): Smith, James G.
• Application Number:
  US05/925,186
• Time in Patent Office: 722 Days
• Field of Search: 81/71, 81/121 R, 85/32 R, 85/37, 85/45
• US Class Current: 81/436
• CPC Class Codes: B25B 13/485 for theft-proof screws, bolts or nuts
• CPC Class Codes: F16B 23/0007 characterised by the shape of the recess or the protrusion engaging the tool F16B23/0069 and F16B23/0076 take precedence
• CPC Class Codes: Y10S 411/91 Antitamper means

Abstract

The combination of a vehicle wheel lug nut and a wrench engagable with the nut to apply and remove the nut from a lug stud. The lug nut is formed with a hexagonal recess that receives a complimentary hexagonal wrench. A plurality of splines and grooves are interposed between the abutting surfaces of the recess and the wrench to code the wrench to the nut. This arrangement reduces the liklihood of theft of the vehicle wheel.

Claims

1. In combination, a threaded fastener for vehicle wheels having a head formed with a coaxial driving recess defined by polygonal straight sides;

a wrench for engagement with said fastener to apply and remove said fastener with respect to a cooperating threaded member, said wrench having a coaxial post axially insertable within said recess to effect rotation of said fastener, said post having straight sides of polygonal configuration complimentary to said recess that drivingly engage said straight sides; and

axially extending coding spline and groove means formed between the abutting surfaces of the straight sides of said driving recess and said post, a first clearance between said spline and groove means being greater than a second clearance between adjacent side edges, the straight sides of said post drivingly engaging the straight sides of said recess before said spline and groove means can be engaged whereby said spline and groove means function solely to code said wrench to said fastener.

2. The combination of claim 1, wherein said spline means are formed within said recess to extend into said groove means formed on said post.

3. A combination of claim 1, wherein said fastener is formed with a coaxial pin that is received by a complimentary coaxial cavity formed in said post.

4. A combination of claim 1, wherein said recess and said post are of hexagonal shape.

5. A combination of claim 2, wherein said fastener is formed with a coaxial pin that is received by a complimentary coaxial cavity formed in said post.

6. A combination of claim 2, wherein said recess and said post are of hexagonal shape.

7. A combination of claim 2, wherein said fastener is formed with a coaxial pin that is received by a complimentary coaxial cavity formed in said post.