Thread former or tap
AssigneeFette GmbH
InventorWolfgang Muller
Life of this patent
Estimating the term…
Abstract
Cold thread forming tap or screw tap with a shaft, said shaft having a chuck portion at the one end and a forming or cutting profile portion on the other end, the forming or cutting profile portion being realised as a separate profile element and being fixable centrically and secured against rotation on the shaft by means of a fixing device, characterised in that the profile element has a small axial length and on the outside a lead-in or starting tap cone, respectively, that juts and/or indentations are formed at the end of the shaft and on that side of the profile element facing the shaft, which interlock in a positively fitting manner, that an automatic centring of the profile element takes place on the shaft when the profile element is put onto the shaft.
Claims12
Cold thread forming tap or screw tap comprising a shaft having two ends, said shaft having a chuck portion at the one end and a forming or cutting profile portion on the other end, the forming or cutting profile portion being realised as a separate profile element and being fixable centrically and secured against rotation on the shaft by means of a fixing device, the profile portion having a small axial length and an outside, the outside having lead-in or starting tap cone, juts and/or indentations formed on the profile portion facing the shaft, which interlock in a positively fitting manner, that an automatic centering of the profile portion takes place on the shaft when the profile portion is put onto the shaft, the juts and indentations comprising complementary lateral areas, inclined with respect to an axis of the shaft and the profile portion, respectively, which are in gearing for the purpose of centering and transmission of torque, wherein the profile portion does not have more than two to four complete thread forming convolutions.
Dependencies are inferred from the claim text.