Fasteners

• US 3,966,339 A
• Filed: 02/21/1975
• Issued: 06/29/1976
• Est. Priority Date: 02/21/1975
• Status: Expired due to Term

• Current Assignee: Borivoj Nemecek, Jean M. Lipman
• Original Assignee: Borivoj Nemecek, Jean M. Lipman
• Inventors: Nemecek, Borivoj, Lipman, Jean M.
• Primary Examiner(s): Kundrat, Andrew V.
• Application Number:
  US05/551,648
• Time in Patent Office: 494 Days
• Field of Search: 403/298, 403/295, 403/292, 403/293, 52/753 E
• US Class Current: 403/292
• CPC Class Codes: A47B 2230/0037 Dowels or dowel-pins
• CPC Class Codes: F16B 12/24 using separate pins, dowels, or the like
• CPC Class Codes: F16B 21/082 the stud, pin or spigot having two resilient parts on its opposite ends in order to connect two elements
• CPC Class Codes: F16B 2200/65 Miter joints
• CPC Class Codes: Y10T 403/55 Member ends joined by inserted section

Abstract

This invention has for its purpose the provision of a plastic dowel fastener designed to give superior attachment of furniture parts in relation to the commonly used wooden dowel. The gripping action of the plastic dowel of the invention is obtained by the provision of a construction of socket gripping fins and stabilizing formations on the elongated dowel body. The fins act to lock the dowel within a socket in a furniture part and the stabilizing formations act to prevent relative movement of the furniture parts which are joined by the plastic dowel.

Claims

1. A dowel fastener of one piece construction formed from suitably high impact strength polymer material comprising a profiled elongated body, the body having a raised central stabilizing formation extending thereform and further raised stabilizing formations which are spaced from the central stabilizing formation and are located towards each end of the body, the said stabilizing formations being operative to stabilize the fastener in a socket therefor, and spaced radially outwardly extendng flexible socket gripping fins extending from and tapering outwardly from the body radially beyond the stabilizing formations and being spaced apart longitudinally on either side of the central stabilizing formation so that the construction is adapted for insertion from either end into a socket of slightly smaller diameter than that of the fins.

2. The fastener of claim 1 in which each of the stabilising formations comprises a peripheral plateau on the body, the plateau being of circular cross-section.

3. The fastener of claim 1 in which the fins have concave faces on their sides facing the centre of the body.

4. The fastener of claim 1 in which the polymer comprises low moisture regain nylon material.

5. The fastener of claim 1 in which the polymer comprises polypropylene.

6. The fastener of claim 1, wherein at least one of said fins, on either side of the central stablizing formation, has an unstressed cross-sectional shape tending to lean toward the central stabilizing formation.

7. The fastener of claim 6, wherein said unstressed cross-sectional shape includes a fin wall of given concavity facing the central stabilizing formation and a fin wall of lesser concavity facing the end of the body.

8. The fastener of claim 6, wherein the fins immediately adjacent the central stabilizing formation have a planar fin wall facing the central stabilizing formation that lies in a plane perpendicular to the body and a fin wall facing the end of the body that forms an acute angle with said plane.