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US4378916A Expired / Lapsed US ⏱️ 0.0 years remaining

Wind-up device for safety belts

Assignee: Volkswagen AG
•
Filing: 1981-06-17
•
Granted: 1983-04-05
•
Expires: 2001-06-17
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Abstract

Abstract A wind-up device for a vehicle safety belt, which device includes a housing, a winding system composed of a winding drum mounted in the housing for automatically winding up the belt so that a portion of the belt is wound around the drum, the drum being locked in the direction of unwinding when a given operating state occurs, and a belt braking device which includes a rotatably mounted brake roller partially surrounded by the belt and mounted for displacement between a normal position in which it is free to rotate and, when the winding drum is blocked, a braking position in which it opposes movement of the belt, movement into the braking position being effected by the tension forces acting on the belt, the braking device further including a bias spring mounted to urge the brake roller into its normal position and in which the brake roller is mounted to be displaced under the force of the belt tension to brakingly contact the outer turn of the belt portion wound on the drum.

Inventors

  • 👤 Franz Keinberger

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 14:03
CPC Classifications
B; B60; B60R; B60R22/00; B60R22/34; B60R22/36; B60R22/42

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 174 words
In a wind-up device for a vehicle safety belt, which device includes a housing, a winding system composed of a winding drum mounted in the housing for automatically winding up the belt so that a portion of the belt is wound around the drum, the drum being blocked in the direction of unwinding when a given operating state occurs, and a belt braking device which includes a rotatably mounted brake roller partially surrounded by the belt and mounted for displacement between a normal position in which it is free to rotate and, when the winding drum is blocked, a braking position in which it opposes movement of the belt, movement into the braking position being effected by the tension forces acting on the belt, the braking device further including a bias spring mounted to urge the brake roller into its normal position, the improvement wherein said brake roller is mounted to be displaced under the force of the belt tension to brakingly contact the outer turn of the belt portion wound on said drum.
Claim 2
Dependent Claim 174 words
In a wind-up device for a vehicle safety belt, which device includes a housing, a winding system composed of a winding drum mounted in the housing for automatically winding up the belt so that a portion of the belt is wound around the drum, the drum being blocked in the direction of unwinding when a given operating state occurs, and a belt braking device which includes a rotatably mounted brake roller partially surrounded by the belt and mounted for displacement between a normal position in which it is free to rotate and, when the winding drum is blocked, a braking position in which it opposes movement of the belt, movement into the braking position being effected by the tension forces acting on the belt, the braking device further including a bias spring mounted to urge the brake roller into its normal position, the improvement wherein said brake roller is mounted to be displaced under the force of the belt tension to brakingly contact the outer turn of the belt portion wound on said drum.
Claim 3
Dependent Claim 43 words
Wind-up device as defined in claim 1 wherein said housing includes side walls presenting guide slots in which said brake roller is held to be displaceable between its said end positions while its axis of rotation remains parallel to that of said drum.
Claim 4
Dependent Claim 19 words
Wind-up device as defined in claim 2 wherein said guide slots extend radially to the axis of said drum.
Claim 5
Dependent Claim 37 words
Wind-up device as defined in claim 1, 2 or 3 wherein said brake roller comprises a member defining the outer circumferential surface of said roller and having a high coefficient of friction with respect to the belt.
Claim 6
Dependent Claim 17 words
Wind-up device as defined in claim 4 wherein said member is a coating of a rubber material.
Claim 7
Dependent Claim 17 words
Wind-up device as defined in claim 4 wherein said member is a toothing at the outer circumference.

References Cited (Backward Citations)

US3384415A Cited
US3389874A Cited
DE2355358A1 Cited
US4249708A Cited
US4327881A Cited
US4328933A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1986-04-04 1986-10-04 1987-04-05 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1990-04-04 1990-10-04 1991-04-05 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1994-04-04 1994-10-04 1995-04-05 $7700.00 Window Closed / Lapsed

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