Chairs and seats – Body or occupant restraint or confinement – Safety belt or harness; e.g. – lap belt or shoulder harness
Patent
1988-04-25
1989-08-08
Zugel, Francis K.
Chairs and seats
Body or occupant restraint or confinement
Safety belt or harness; e.g., lap belt or shoulder harness
2421072, 297479, A62B 3500
Patent
active
048546445
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a deflection clamping device for a safety belt system comprising a stationary clamping member and a movable clamping member, which beyond a predetermined belt-pulling load is brought into clamping engagement with the belt and this belt into clamping engagement with the stationary clamping member.
The space availability for the mounting of a deflection clamping device is often so confined that only a component with a small structural depth (t) has a chance of finding use in practice.
It is also of significance from a technological point of view to initiate with every blocking (car-sensitive (CS) =0.45 g and web-sensitive (WS) =1.5 g) a clamped blocking, in order to be able to realise the least possible belt extraction. A prerequisite for this is, however, that an extremely gentle engagement of the clamp with the belt takes place. This is then insured if the clamp teeth only engage transversely to the belt and no relative movement takes place in the longitudinal direction of the belt, which would cause roughening of the belt. Here reference is made to DE-OS 3 543 959. Therein it is expounded that in an endurance test, 20.000 clampings blockings have to be proved. After this, the belt must still be fully loadable.
In addition, it is already known in connection with clamping devices that in order to clamp the belt, a clamping wedge is moved by means of a guide ramp slide onto the belt.
It is the object of the invention to create a deflection clamping device of the type mentioned above which has, with the insurance of a synchronized clamping engagement, a small structural depth (t).
This object is solved according to the invention in that the movable clamping member is a clamping wedge that supports itself on a stationary guide ramp which has, in the direction of extraction of the belt and in the direction towards the stationary clamping member, a sloped sliding surface for the clamping wedge, and that a control lever, supporting a belt deflection member and which is rotatable about a stationary axis, operates together with a control member acting via an active surface, orientated at an angle (.alpha.) to the running direction of the belt upon the clamping wedge said angle thus set that the control lever, influenced by the extraction of the belt, has a velocity component in the direction of extraction of the belt that is equal to the belt extraction speed.
The clamping wedge, in connection with the control lever, allows for a relatively small structural depth in addition to the attainment of a synchronisation effect with the result that during its motion along the belt, the clamping wedge is given a velocity component pointing in the direction of extraction of the belt that is equal to the speed of belt extraction. The sliding surface of the guide ramp cannot bring this about alone, but the particular orientation of the active surface to the angle (.alpha.) is such that adjusted to the prevailing conditions, the synchronisation effect can be achieved in a simple and effective manner.
The angle (.alpha.) depends upon the prevailing conditions. With a short gap between the deflection clamping device and the roller (short extension length of belt), little film reel effect in the roller and little belt extension, (.alpha.) can be small. This means, when the roller locks, relatively little belt runs through the deflection clamping device in the direction (A) (in the pulling load direction). During a time increment (t) only a few millimeters (mm) pass the toothed clamping wedge, so that the synchronizing vertical stroke of the clamping wedge need only be relatively small.
If on the other hand a larger gap exists between the roller and the deflection clamping device as well as a greater belt extension and a greater film reel effect, then a larger angle (.alpha.) must be chosen. During the same time increment (t), a greater belt length would pass the clamping wedge, so that the clamping wedge must have a faster stroke in the vertical direction (the direction of belt extraction), when impinging
REFERENCES:
patent: 4208770 (1980-06-01), Takada
patent: 4323204 (1982-04-01), Takada
patent: 4422593 (1983-12-01), Takada
patent: 4438551 (1984-03-01), Imai
patent: 4492348 (1985-01-01), Ziv et al.
patent: 4549770 (1985-10-01), Kurtti
patent: 4552407 (1985-11-01), Takada
Britax-Kolb GmbH & Co.
Zugel Francis K.
LandOfFree
Deflection clamping device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Deflection clamping device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Deflection clamping device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-900578