Patent US4568394A successfully refreshed from Google Patents.
US4568394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing springs, including the production of wire therefor
Assignee: General Electric Co
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Filing: 1984-07-02
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Granted: 1986-02-04
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Expires: 2004-07-02
Abstract
Abstract The method of manufacturing coiled springs comprising forming steel rod by hot rolling, oil-tempering the rod as produced in the hot rolling operation, without drawing it, by passing it through an austenitizing step, an oil quenching step and a tempering step, cold-drawing the resultant oil-tempered rod into wire, and winding springs from the wire.
Inventors
- 👤 Ralph M. Cassell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:10
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/06; C21D9/00; C21D9/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
61 words
The method of producing steel wire (particularly suitable for the manufacture of coiled springs) comprising forming steel rod by hot rolling, oil tempering the rod as produced in the hot rolling operation, without drawing the rod, by passing it through an austenitizing step, an oil-quenching step, and a tempering step, cold-drawing the resultant oil-tempered rod into wire, and coiling the wire.
Claim 2
Independent Claim
61 words
The method of producing steel wire (particularly suitable for the manufacture of coiled springs) comprising forming steel rod by hot rolling, oil tempering the rod as produced in the hot rolling operation, without drawing the rod, by passing it through an austenitizing step, an oil-quenching step, and a tempering step, cold-drawing the resultant oil-tempered rod into wire, and coiling the wire.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein the rod is hot rolled from AISI 1060, 1566, 1572, or 5160 steel.
Claim 4
Dependent Claim
47 words
The method of claim 2 wherein the rod is austenitized by heating it to a temperature from about 1650° F. to 1700° F., oil quenched at a temperature from about 200° F. to 225° F., and tempered at a temperature from about 800° F. to 1000° F.
Claim 5
Dependent Claim
22 words
The method of claim 1 further comprising coiling said resultant oil-tempered rod and then uncoiling it prior to drawing it into wire.
Claim 6
Dependent Claim
18 words
The method of claim 1 further comprising stress-relieving said wire at a temperature of about 600 degrees Fahrenheit.
Claim 7
Dependent Claim
28 words
The method of claim 5 wherein the wire is stress-relieved by heating it to a temperature of about 600° F. for a time interval of about 40 minutes.
Claim 8
Independent Claim
55 words
The method of manufacturing coiled springs comprising forming steel rod by hot rolling, oil-tempering the rod as produced in the hot rolling operation, without drawing the rod, by passing it through an austenitizing step, an oil quenching step and a tempering step, cold-drawing the resultant oil-tempered rod into wire, and winding springs from the wire.
Claim 9
Independent Claim
55 words
The method of manufacturing coiled springs comprising forming steel rod by hot rolling, oil-tempering the rod as produced in the hot rolling operation, without drawing the rod, by passing it through an austenitizing step, an oil quenching step and a tempering step, cold-drawing the resultant oil-tempered rod into wire, and winding springs from the wire.
Claim 10
Dependent Claim
19 words
The method of claim 7 wherein the rod is hot rolled from AISI 1060, 1566, 1572, or 5160 steel.
Claim 11
Dependent Claim
47 words
The method of claim 8 wherein the rod is austenitized by heating it to a temperature from about 1650° F. to 1700° F., oil quenched at a temperature from about 200° F. to 225° F., and tempered at a temperature from about 800° F. to 1000° F.
Claim 12
Dependent Claim
14 words
The method of claim 7 wherein the wire is cold wound to form springs.
Claim 13
Dependent Claim
28 words
The method of claim 7 further comprising stress-relieving said wire at a temperature less than the temperature at said tempering step prior to winding springs from said wire.
Claim 14
Dependent Claim
28 words
The method of claim 11 wherein the wire is stress-relieved by heating it to a temperature of about 600° F. for a time interval of about 40 minutes.
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) | 1989-02-03 | 1989-08-05 | 1990-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-03 | 1993-08-05 | 1994-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-03 | 1997-08-05 | 1998-02-04 | $7700.00 | Window Closed / Lapsed |