Patent US4291501A successfully refreshed from Google Patents.
US4291501A
Expired / Lapsed
US
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Device for counterbalancing a swivelable body part on a motor vehicle
Assignee: Bayerische Motoren Werke AG
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Filing: 1979-02-23
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Granted: 1981-09-29
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Expires: 1999-02-23
Abstract
Abstract A device for counterbalancing a swivelable body part on a motor vehicle, especially a trunk lid on an automobile, said device including a hinge for the swivelable body part and a torsion bar, the torsion bar being bent to form a crank in the vicinity of a movable hinge part. An intermediate lever is articulated on the movable hinge part and engages the crank, the crank including a crank pin between two legs, the legs being connected by arcuate segments both with the crank pin and with the torsion bar. The legs are made S-shaped so as to minimize waste, provide ease of manufacture and small installation space requirements for the crank.
Inventors
- 👤 Klaus Steinberg
- 👤 Gerhard Hoffmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:11
CPC Classifications
E; E05; E05F; E05F1/00; E05F1/08; E05F1/10; E05F1/12; E05F1/123; E05F1/1238; E05Y; E05Y2900/00; E05Y2900/50; E05Y2900/53; E05Y2900/548
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
113 words
A device for counterbalancing a swivelable body part on a motor vehicle, such as a trunk lid on an automobile, comprising hinge means for the swivelable body part and a torsion bar, said torsion bar being bent to form a crank in the vicinity of a movable hinge part of said hinge means, intermediate lever means articulated on the movable hinge part and engaging the crank, said crank including a crank pin between two legs, the legs comprising first arcuate segments connected with the torsion bar and second arcuate segments connected with the crank pin, and wherein said first and second arcuate segments each extend through an arc of more than 90 degrees.
Claim 2
Independent Claim
113 words
A device for counterbalancing a swivelable body part on a motor vehicle, such as a trunk lid on an automobile, comprising hinge means for the swivelable body part and a torsion bar, said torsion bar being bent to form a crank in the vicinity of a movable hinge part of said hinge means, intermediate lever means articulated on the movable hinge part and engaging the crank, said crank including a crank pin between two legs, the legs comprising first arcuate segments connected with the torsion bar and second arcuate segments connected with the crank pin, and wherein said first and second arcuate segments each extend through an arc of more than 90 degrees.
Claim 3
Dependent Claim
21 words
A device according to claim 1, wherein the first and second arcuate segments of each leg merge directly with each other.
Claim 4
Dependent Claim
39 words
A device according to claim 1, wherein said legs are each provided between their first and second arcuate segments with a straight intermediate segment, the intermediate segments of the two legs converging in the direction toward said torsion bar.
Claim 5
Dependent Claim
44 words
A device according to claim 2, wherein said torsion bar is made of round stock and wherein the average bending radius of each first and second arcuate segment of the legs is equivalent a diameter at least twice the diameter of the torsion bar.
Claim 6
Dependent Claim
27 words
A device according to claim 1, 3 or 4 wherein the first arcuate segments connecting the legs with the torsion bar are disposed a short distance apart.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-28 | 1985-03-30 | 1985-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-28 | 1989-03-30 | 1989-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-28 | 1993-03-30 | 1993-09-29 | $7700.00 | Window Closed / Lapsed |