Title:
TAPPING SCREW FOR WORKING INTERNAL THREAD IN LOW DUCTILITY MATERIAL
Document Type and Number:
Japanese Patent JP3545774
Kind Code:
B2
Abstract:
PURPOSE: To work a screw thread on a workpiece by compressive action by forming an opposed angle substantially ranging from 90° to 120° on the screw thread of an external thread formed in a screw shaft.
CONSTITUTION: An opposed angle 66 regulated by both sides of a screw thread of an external thread is set to an angle substantially ranging from 90° to 120°. When the height 88 of the vertical screw thread between the screw shaft 16 and the top flat part 70 ranges from 17% of the height of the screw thread in a workpiece material to 100% thereof, substantially the engagement is obtained. Accordingly, a composite side area 82 larger than the top area 76 is provided to minimize the radial crushing force and shearing force applied to the workpiece by the side surface 64.
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Inventors:
Paul Edward Hartell
James Robert Schneider
James Robert Schneider
Application Number:
JP3748593A
Publication Date:
July 21, 2004
Filing Date:
February 01, 1993
Export Citation:
Assignee:
TEXTRON INCORPORATED
International Classes:
B23G5/06; B23G7/00; F16B25/00; F16B25/06; F16B33/02; (IPC1-7): F16B25/06; B23G5/06; B23G7/00; F16B33/02
Domestic Patent References:
| JP63189526U | ||||
| JP57195912A | ||||
| JP48015811B1 | ||||
| JP4171310A |
Foreign References:
| US2254503 | ||||
| US3530760 | ||||
| GB1304605A |
Attorney, Agent or Firm:
Toshio Umeda
Kazuya Chikatsu
Masaru Itami
Kazuya Chikatsu
Masaru Itami
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