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:
Dec. 13, 2016
Filed:
Dec. 29, 2015
Aoyama Seisakusho Co., Ltd., Niwa-Gun, JP;
Masahiko Hamada, Niwa-Gun, JP;
Aoyama Seisakusho Co., Ltd., Niwa-Gun, JP;
Abstract
A self-tapping screw for soft metals having low required initial driving torque, high axial force in the tightened state, small axial force reduction due to heat or the like, and a low manufacturing cost because no intricate and expensive mold is required, and also has an advantage that an amount of produced chip powder is small. The self-tapping screw includes a tapered smaller diameter part at an end of a shaft. The smaller diameter part is inserted and driven into a pilot hole formed in a soft metal to form a female screw in the pilot hole. In the shaft and the smaller diameter part, a continuous male screw with a constant pitch is formed. A thread ridge of the male screw of the smaller diameter part is provided with multiple sets of a largest diameter part and an increasing diameter part, the largest diameter part having a stepped part at a position on a trailing side of the largest diameter part during driven turning of the screw, the increasing diameter part having a gradually increasing diameter from the stepped part to a next largest diameter part.