Land vehicles – Wheeled – Attachment
Patent
1986-03-07
1988-07-12
Love, John J.
Land vehicles
Wheeled
Attachment
2421072, B60G 2200
Patent
active
047565543
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a clamping device for a motor vehicle safety belt.
Motor vehicle safety belt systems with a safety belt take-up device are known. The take-up device is secured to the motor vehicle and has a wind shaft on which the safety belt is kept in a wound up condition when the system is not in use. On putting on the safety belt, the user pulls it from the take-up device against the action of at least one winding spring acting on the wind shaft and when the safety belt is taken off the spring turns the wind shaft in the opposite direction so that the belt is wound back onto it and is taken up by the take-up device. When the belt is fastened on the user the wind shaft is normally able to be turned in order to give the occupant of the motor vehicle using the belt a certain freedom of movement. It is only when the motor vehicle is subject to a certain degree of deceleration that the wind shaft is locked so that it is no longer able to turn in that direction in which the belt would be payed-off from the take-up device.
Furthermore, clamping devices have been proposed for such motor vehicle safety belt systems which serve to provide an additional clamping effect on the belt extending from the wind shaft of the take-up device after the shaft has been locked, this clamping action being to prevent further motion of the safety belt in the pay-off direction owing to the coil of the belt on the locked wind shaft becoming more tightly wound.
Such known clamping devices are made part of the belt deflecting fitting, which is attached on a B column of a motor vehicle for deflecting the belt which comes from the take-up device placed at the foot of the column and extends, when in use, diagonally over the shoulder and the chest of the motor vehicle occupant using it. Such clamping devices have two clamping members each in the form of a wedge, and a housing in the form of a rectangular sleeve on a base plate, which may be fixed to the vehicle, through which housing the belt coming from the take-up device extends before being trained around an annular deflecting member. The deflecting member may be joined by a sort of universal joint with a slide, which is able to be moved on the base plate in the direction of its length and which on the end projecting from the housing and facing away from the deflecting member is provided with a first wedge, which on the side turned away from the base plate has an oblique surface that is inclined in relation to the base plate and to the belt extending parallel thereto through the housing. Between this oblique surface, whose distance from the base plate becomes larger towards the deflecting member, and the safety belt a second wedge is arranged in the housing, and this second wedge on the one side makes contact with a correspondingly inclined oblique surface on the inclined surface of the first wedge, and on the other side has a clamping surface, generally parallel to the belt, for the same and is slidingly guided in the housing in a direction normal to the oblique surfaces of the two wedges. Together with the first wedge this slide is spring loaded away from the second wedge, and the latter is urged away from the belt. Once a certain degree of belt tension is exceeded in operation, as will be the case every time the motor vehicle undergoes a certain degree of deceleration and the wind shaft of the take-up device is locked and the motor vehicle occupant using the safety belt is thrown forwards, the belt acting via the deflecting member draws the slide against the action of its spring loading downwards towards the housing so that the first wedge moves the second wedge against the action of its spring loading towards the belt and inner clamping surface of the front wall of the housing which is essentially parallel to the belt in order to clamp the belt in the housing between this clamping surface and the opposite clamping surface of the second wedge.
The object of the invention is to provide a clamping device of the type having two clamping members which has an extremely high spe
REFERENCES:
patent: 3504867 (1970-04-01), Stevenson
patent: 4120466 (1978-10-01), Adomeit
patent: 4208770 (1980-06-01), Takada
patent: 4327881 (1982-05-01), Fohl
patent: 4492348 (1985-01-01), Ziv et al.
patent: 4550951 (1985-11-01), Apri
patent: 4552407 (1985-11-01), Takada
patent: 4624422 (1986-11-01), Hollowell
Ferriter Karin L.
Goebel Ronald G.
Love John J.
Tibbe KG
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