US5205466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacturing method of austenitic stainless steel self-tapping and self-drilling screw
Assignee: Individual
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Filing: 1992-07-15
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Granted: 1993-04-27
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Expires: 2012-07-15
Abstract
Abstract This invention is a manufacturing method of Austenitic stainless steel self-tapping and self-drilling screw. It uses low carbon steel or low carbon alloy steel and forges or cuts it into a round rod with a shoulder, non-threaded bolt, and drilling end portion. After it is carburized and properly heat-treated, it will be welded together with an Austenitic stainless steel round rod which has a non-threaded bolt. And then the welded flush and shoulder will be cut so that a non-carburized hardened area in a proper width can be formed. Lastly it is threaded and quenched so as to manufacture a screw whose head and threaded stem joint are high corrosion-resistance and whose carburized drilling end portion has a high self-tapping and self-drilling function.
Inventors
- 👤 Yao-Tin Ker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:06
CPC Classifications
F; F16; F16B; F16B35/00; B; B23; B23P; B23P15/00; C; C21; C21D; C21D9/00; C21D9/0093; F16B25/00; F16B25/0036; F16B25/0094; F16B25/10; F16B25/103; F16B33/00; F16B33/008; C21D2251/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
144 words
A method of manufacturing an austenitic stainless steel self-tapping and self-drilling screw formed from low carbon or low carbon alloy steel including the steps of: (a) forming a low carbon or low carbon alloy steel rod having a rod shoulder section, a rod non-threaded bolt section and a rod drilling end section; (b) carburizing and heat treating said rod to a predetermined carburization depth to provide a carburized portion of said rod; (c) establishing an austenitic stainless steel rod having a head section and a non-threaded bolt section; (d) welding said austenitic stainless steel non-threaded bolt section to said rod shoulder section in aligned relation thereto forming a weld flash; (e) removing said rod shoulder section and said weld flash to provide a non-carburized section of said rod; (f) threading said rod non-threaded bolt section and said austenitic stainless steel rod non-threaded bolt section.
Claim 2
Independent Claim
144 words
A method of manufacturing an austenitic stainless steel self-tapping and self-drilling screw formed from low carbon or low carbon alloy steel including the steps of: (a) forming a low carbon or low carbon alloy steel rod having a rod shoulder section, a rod non-threaded bolt section and a rod drilling end section; (b) carburizing and heat treating said rod to a predetermined carburization depth to provide a carburized portion of said rod; (c) establishing an austenitic stainless steel rod having a head section and a non-threaded bolt section; (d) welding said austenitic stainless steel non-threaded bolt section to said rod shoulder section in aligned relation thereto forming a weld flash; (e) removing said rod shoulder section and said weld flash to provide a non-carburized section of said rod; (f) threading said rod non-threaded bolt section and said austenitic stainless steel rod non-threaded bolt section.
Claim 3
Dependent Claim
95 words
The method of manufacturing said austenitic stainless steel self-tapping and self-drilling screw as recited in claim 1 wherein the step of forming said low carbon or low carbon alloy steel rod includes the step of: establishing said rod shoulder section having a diameter approximately equal to or larger than the summation of an outer diameter of said rod non-threaded bolt section and twice said carburization depth, said rod shoulder section having a width approximately equal to or larger than the summation of a width of a welding heat affected zone and twice said carburization depth.
Claim 4
Dependent Claim
39 words
The method of manufacturing said austenitic stainless steel self-tapping and self-drilling screw as recited in claim 1 wherein said rod non-carburized portion has a width approximately equal to or larger than a width of a welding heat affected zone.
Claim 5
Dependent Claim
30 words
The method of manufacturing said austenitic stainless steel self-tapping and self-drilling screw as recited in claim 1 wherein said rod shoulder section is contoured into a predetermined cross-sectional geometric configuration.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-04-26 | 1996-10-26 | 1997-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-26 | 2000-10-26 | 2001-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-26 | 2004-10-26 | 2005-04-27 | $7700.00 | Window Closed / Lapsed |