Title:
金属中空ねじ及びその製造方法
Document Type and Number:
Japanese Patent JP6599971
Kind Code:
B2
Abstract:
A method for making a hollow screw, comprising the steps of- forming a shallow cup having a radially outwardly extending rough cut flange at one end thereof from a generally flat metal material;- extruding an elongated and hollow body from the shallow cup;- clipping and flattening the generally radially outwardly extending rough cut flange to the desired size and shape of a screw head;- annealing to soften at least the elongated and hollow body;- rolling a plurality of threads to at least a portion of the exterior of the softened elongated and hollow body, thereby forming the elongated and hollow body into a substantially smooth shank portion and a threaded portion;- and hardening the hollow screw (Figure 1).
Inventors:
Footer Charles G
Application Number:
JP2017501213A
Publication Date:
October 30, 2019
Filing Date:
July 07, 2015
Export Citation:
Assignee:
Physical Systems Incorporated
International Classes:
F16B35/00; B21D51/10; B21H3/04; B21K1/46; F16B23/00; F16B37/00; F16B39/26
Domestic Patent References:
| JP57086608A | ||||
| JP48002907Y1 |
Attorney, Agent or Firm:
Shinichiro Tanaka
Disciple Maru Ken
▲吉▼田 和彦
Shishido Kaichi
Mitsuru Matsushita
Ichiro Kurasawa
Yasushi Yamamoto
Disciple Maru Ken
▲吉▼田 和彦
Shishido Kaichi
Mitsuru Matsushita
Ichiro Kurasawa
Yasushi Yamamoto