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Dual head fastener

  • US 4,189,976 A
  • Filed: 06/29/1978
  • Issued: 02/26/1980
  • Est. Priority Date: 06/29/1978
  • Status: Expired due to Term
First Claim
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1. A fastener element adapted for use as a bolt head, nut and the like comprising;

  • an operative structure adapted for removably interconnecting with at least one other element of a fastener assembly to complete the assembly, a head extending from the operative structure and having an exterior surface adapted to be removably engaged by a tool for rotation of the element, the head being hexagonal in configuration on its outer surface for a predetermined portion of its height and being of a twelve pointed configuration on its outer surface for a predetermined portion of its height thereby permitting the use of a fastener element with a tool adapted for engagement with a six pointed surface or a tool for engagement with a twelve pointed surface, the head being hexagonal in configuration and having a projection extending from each side thereof a predetermined height less than the height of the head and being circumferentially aligned to thereby cooperate with the edges of each adjoining pair of sides to the head to form a twelve point head portion at the location of the projection while retaining a six point head portion at the remainder of the head formed by the point of joinder of the six sides thereby permitting the use of the fastener element with either a six point or a twelve point wrench.

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