US4036449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Belt roll-up mechanism for a safety belt in a vehicle
Assignee: Daimler Benz AG
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Filing: 1975-09-05
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Granted: 1977-07-19
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Expires: 1995-09-05
Abstract
Abstract A belt roll-up mechanism for a safety belt in a motor vehicle, in which the pull-out force required to overcome the force produced by the pull-back device is controlled over the entire pull-out range of the safety belt by at least one shifting member so as to have an essentially constant value or a value decreasing with an increased pull-out length, which value in the maximum case corresponds to the pull-back force effective at the end of a roll-up operation.
Inventors
- 👤 Winfried Schreiber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:54
CPC Classifications
B; B60; B60R; B60R22/00; B60R22/34; B60R22/44; B60R2022/4413; B60R2022/448
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
97 words
A belt roll-up mechanism for a safety belt means in a vehicle, comprising a pull-back means effective at least during the driving operation for acting upon the safety belt means and shifting means for controlling the value of the pull-out force developed by the pull-back means, said shifting means including two axially parallel disposed cam wheels in slip-free engagement with each other, each cam wheel having an effective lever arm, said shifting means varying the effective lever arms of said cam wheels over the entire pulled-out range of the safety belt means for controlling the pull-out force.
Claim 2
Dependent Claim
97 words
A belt roll-up mechanism for a safety belt means in a vehicle, comprising a pull-back means effective at least during the driving operation for acting upon the safety belt means and shifting means for controlling the value of the pull-out force developed by the pull-back means, said shifting means including two axially parallel disposed cam wheels in slip-free engagement with each other, each cam wheel having an effective lever arm, said shifting means varying the effective lever arms of said cam wheels over the entire pulled-out range of the safety belt means for controlling the pull-out force.
Claim 3
Dependent Claim
40 words
A belt roll-up mechanism according to claim 1, wherein said shifting means varies the effective lever arms of said cam wheels over the entire pulled-out range of the safety belt means for maintaining the pull-out force at a constant value.
Claim 4
Dependent Claim
21 words
A belt roll-up mechanism according to claim 2, characterized in that the continuously effective force is supplied by a band spring.
Claim 5
Dependent Claim
24 words
A belt roll-up mechanism according to claim 3, characterized in that the cam wheels are cam-shaped gears in continuous meshing engagement with one another.
Claim 6
Dependent Claim
49 words
A belt roll-up mechanism according to claim 1, wherein said shifting means varies the effective lever arms of said cam wheels over the entire pulled-out range of the safety belt means to provide a pull-out force whose value decreases with an increasing pull-out length of the safety belt means.
Claim 7
Dependent Claim
21 words
A belt roll-up mechanism according to claim 5, characterized in that the continuously effective force is supplied by a band spring.
Claim 8
Dependent Claim
24 words
A belt roll-up mechanism according to claim 6, characterized in that the cam wheels are cam-shaped gears in continuous meshing engagement with one another.
Claim 9
Dependent Claim
32 words
A belt roll-up mechanism according to claim 5, wherein the maximum value of the pull-out force is equal to the value of the pull-out force at the end of a rolling-up operation.
Claim 10
Dependent Claim
39 words
A belt roll-up mechanism according to claim 1, wherein the effective lever arm of each cam wheel is equal to the distance between the axis of each cam wheel and the point of contact with the other cam wheel.
Claim 11
Dependent Claim
22 words
A belt roll-up mechanism according to claim 1, wherein said pull-back means is influenced by a force which is effective essentially continuously.
Claim 12
Dependent Claim
21 words
A belt roll-up mechanism according to claim 10, characterized in that the continuously effective force is supplied by a band spring.
Claim 13
Dependent Claim
24 words
A belt roll-up mechanism according to claim 11, characterized in that the cam wheels are cam-shaped gears in continuous meshing engagement with one another.
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) | 1980-07-18 | 1981-01-17 | 1981-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-18 | 1985-01-17 | 1985-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-18 | 1989-01-17 | 1989-07-19 | $7700.00 | Window Closed / Lapsed |