Patent US2093250A successfully refreshed from Google Patents.
Patent US5598735A successfully refreshed from Google Patents.
US5598735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hollow stabilizer manufacturing method
Assignee: Horikiri Inc
•
Filing: 1994-08-09
•
Granted: 1997-02-04
•
Expires: 2014-08-09
Abstract
Abstract A method of manufacture of a hollow stabilizer for automobiles which uses a heat-finished seamless steel pipe 20 as a material, comprising an inner surface and/or an outer surface of a part corresponding to a bending R portion A-B of the steel pipe 20 is polished to remove defects of the surface of the steel pipe, and after the above surface roughness is made less than Rmax 50 μm, the part corresponding to the above bending R portion is previously formed an ellipse in section, and then the section after bending process accesses to a true circle to alleviate stress concentration of the bending part.
Inventors
- 👤 Tsutomu Saito
- 👤 Takashi Fukui
- 👤 Akio Namikiri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:24
CPC Classifications
B; B21; B21D; B21D7/00; B60; B60G; B60G21/00; B60G21/02; B60G21/04; B60G21/05; B60G21/055; B60G2200/00; B60G2200/10; B60G2200/14; B60G2200/142; B60G2202/00; B60G2202/10; B60G2202/13; B60G2202/135; B60G2204/00; B60G2204/10; B60G2204/12; B60G2204/122; B60G2204/40; B60G2204/45; B60G2206/00; B60G2206/01; B60G2206/012; B60G2206/40; B60G2206/42; B60G2206/427; B60G2206/80; B60G2206/81; B60G2206/8103
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
66 words
A method of manufacturing a hollow stabilizer for a car which comprises the steps of polishing to remove defects of the surface of a heat-finished seamless steel pipe at an inner surface or an outer surface only at R portions to be bent; adjusting the surface roughness to not greater than Rmax 50μ, and bending the steel pipe at said R portions to form a stabilizer.
Claim 2
Independent Claim
66 words
A method of manufacturing a hollow stabilizer for a car which comprises the steps of polishing to remove defects of the surface of a heat-finished seamless steel pipe at an inner surface or an outer surface only at R portions to be bent; adjusting the surface roughness to not greater than Rmax 50μ, and bending the steel pipe at said R portions to form a stabilizer.
Claim 3
Independent Claim
125 words
A method of manufacturing a hollow stabilizer for a car which comprises the steps of polishing to remove defects of the surface of a heat-finished seamless steel pipe at an inner surface or an outer surface at R portions to be bent; adjusting a surface roughness to not greater than Rmax 50 μm; processing said steel pipe at the R positions to be bent, so that the section which has a certain flat rate is a long ellipse form in an axial direction extending an inner side and an outer side of the bending center; and bending said steel pipe at the R positions to form a stabilizer, whereby the sectional form of the bending R portion after bending is in a nearly circular form.
Claim 4
Independent Claim
125 words
A method of manufacturing a hollow stabilizer for a car which comprises the steps of polishing to remove defects of the surface of a heat-finished seamless steel pipe at an inner surface or an outer surface at R portions to be bent; adjusting a surface roughness to not greater than Rmax 50 μm; processing said steel pipe at the R positions to be bent, so that the section which has a certain flat rate is a long ellipse form in an axial direction extending an inner side and an outer side of the bending center; and bending said steel pipe at the R positions to form a stabilizer, whereby the sectional form of the bending R portion after bending is in a nearly circular form.
Claim 5
Dependent Claim
19 words
A method of manufacturing a hollow stabilizer according to claim 1, wherein a depth of polishing is 0.05-0.5 mm.
Claim 6
Dependent Claim
29 words
A method of manufacturing a hollow stabilizer according to claim 1, wherein a depth of said polishing is 0.05-0.5 mm and a surface roughness is finished Rmax 10-30 μm.
Claim 7
Dependent Claim
19 words
A method of manufacturing a hollow stabilizer according to claim 2, wherein a depth of polishing is 0.05-0.5 mm.
Claim 8
Dependent Claim
29 words
A method of manufacturing a hollow stabilizer according to claim 2, wherein a depth of said polishing is 0.05-0.5 mm and a surface roughness is finished Rmax 10-30 μm.
Claim 9
Dependent Claim
22 words
A method of manufacture of a hollow stabilizer according to claim 2, wherein a flat rate of said ellipse form is 10-19%.
Claim 10
Dependent Claim
22 words
A method of manufacture of a hollow stabilizer according to claim 3, wherein a flat rate of said ellipse form is 10-19%.
Claim 11
Dependent Claim
22 words
A method of manufacture of a hollow stabilizer according to claim 4, wherein a flat rate of said ellipse form is 10-19%.
Claim 12
Dependent Claim
22 words
A method of manufacture of a hollow stabilizer according to claim 2, wherein a flat rate of said ellipse form is 15-19%.
Claim 13
Dependent Claim
22 words
A method of manufacture of a hollow stabilizer according to claim 3, wherein a flat rate of said ellipse form is 15-19%.
Claim 14
Dependent Claim
22 words
A method of manufacture of a hollow stabilizer according to claim 4, wherein a flat rate of said ellipse form is 15-19%.
References Cited (Backward Citations)
JPS5714420A
Cited
JPS6076232A
Cited
JPS60154827A
Cited
US4841760A
Cited
US4882019A
Cited
US4936503A
Cited
US5294309A
Cited
US5103666A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-02-04 | 2000-08-05 | 2001-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-02-04 | 2004-08-05 | 2005-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-02-04 | 2008-08-05 | 2009-02-04 | $7700.00 | Window Closed / Lapsed |