The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 18, 2003
Filed:
Jun. 21, 2002
Applicant:
Inventor:
Wen-Lung Cheng, Kaohsiung City, TW;
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21H 3/02 ; B23G 9/00 ;
U.S. Cl.
CPC ...
B21H 3/02 ; B23G 9/00 ;
Abstract
A cool-wrought pressing forming method for slotted headless screws includes five steps of using five different molds and five pressing heads for processing a unit of screw material cut from linear material for forming an unfinished screw with a slot in an upper end. A clamping member is provided for clamping a screw material for moving it from a first mold in a first step to a second mold in a second step after pressed by a first pressing head and then from a second step to a third mold in a third step, and so forth. The slot of a screw is formed by pressing to make the slot neat and without any hairy sides and look very flat, enhancing production effect and lowering cost.