Method of producing left-right screw
AssigneeYugen Kaisha Art Screw
InventorKou Matsubayashi
Life of this patent
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Abstract
The present invention provides a method for manufacturing a right- and left-hand screw having a first external right-handed thread and a second external left-handed thread formed by an inexpensive rolling process using a rolling die with a first thread-cutting die for the first thread and a second thread-cutting die for the second thread.
Claims3
A method for manufacturing a right- and -left-hand screw having a first external thread and a second external thread formed reversely, said second external thread having a smaller pitch than said first external thread, said method simultaneously forms said first external thread and said second external thread by rolling a screw material by use of a rolling die having a first thread cutting blade for said first external thread and a second thread cutting blade for said second external thread on the same surface,
- wherein a diameter of said screw material is smaller than a diameter of screw material generally used only for said first external thread.
Dependencies are inferred from the claim text.