Anchor bolt
AssigneeVidex-Wire Products (Pty.) Limited
InventorsDavid Wiesenfeld, Moshe Josef
Life of this patent
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Abstract
A method of making an anchor bolt with a thread on a section thereof comprising the steps of providing a metal bar (1) of circular or near circular cross-section having a diameter which is substantially equal to the pitch diameter of the thread to be provided thereon, extruding the bar along a selected section (A) thereof to reduce its cross-section, forming a series of lateral protrusions (3) on the selected section of the bar, straightening the bar, and, forming a thread (5) with the said pitch diameter on a further selected section of the bar.
Claims8
A method of making an anchor bolt with a thread on a section thereof comprising the steps of sequentially providing a metal bar of circular or near circular cross-section having a predetermined diameter, extruding the bar along a selected section thereof to reduce its cross-section, forming a series of lateral protrusions on the selected section of the bar, straightening the bar, and, forming an uninterrupted circular thread on a further selected and unextruded section of the bar and which circular thread has a pitch diameter corresponding to said predetermined diameter, the root of the thread defining a cross-section of the bar substantially equal to said reduced cross-section whereby the tensile strength of said bolt is determined by the equal cross-sections of said root and reduced selected section.
Dependencies are inferred from the claim text.