Land vehicles – Wheeled – Attachment
Patent
1985-10-24
1987-07-28
Love, John J.
Land vehicles
Wheeled
Attachment
280808, B60R 2236
Patent
active
046827919
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a deflection mounting which is preferably attached on the B-column of a vehicle for the front occupants and is designed for direct locking of the belt and absorption of load caused by an accident.
With today's safety belts, on the occurrence of an accident the reel winder is locked and tranfers the load from the occupants via the deflection mounting to the chassis. As a result of the film spool effect on the winding reel of the winder (extension of the belt permitted by slackness between successive turns without rotation of the reel) and stretching of the belt between the winder and the deflection mounting, the occupant experiences an additional initial displacement which--in particular in the case of small vehicles--can be unpleasantly noticeable. Head impact on the steering wheel and dashboard is possible.
In order to prevent this additional initial displacement, it is useful to effect arresting of the belt directly in the deflection mounting, thus as close as possible to the occupant. For this purpose, many solutions have already been suggested which all make use of the locking principle according to DE-PS No. 1 481 969. The belt-withdrawal force acts upon a rotatably mounted locking body with a lever arm (L.sub.1) and acts through a smaller lever arm (L.sub.2) as a belt clamping force. From this basic principle, various differing developments have resulted over the years.
The decisive evaluation criteria for the efficiency of the individual proposals are the clamping effect in dependence upon the belt withdrawal direction and the aggressiveness of the clamping surfaces with repeated locking of the belt.
Thus, DE-OS No. 2 420 848 illustrates a clamping device which operates substantially independently of various belt withdrawal angles. The clamping effect is at its most favourable (largest lever arm) if the belt proceeds horizontally as shown in EP No. 0 034 702. However, this produces high friction with a coefficient of greater than 1 being necessary in order to achieve slip-free clamping of the belt. This requires aggressive (sharp-edged) clamping surfaces which has a disadvantageous effect on the durability of the textile belt subjected to repeated locking operations.
It is conceivable to utilize such a clamping device in connection with a deliberate weak point to be activated only in an accident, perhaps with an average loading of about 4 kN belt withdrawal force. This however entails an extremely stable winder reel. One of the most important advantages of a deflector clamping device absorbing the entire load is however that it enables the installation of lighter and cheaper winder reels because it is no longer necessary to transfer the load to the winder. Also the film spool effect would occur to some extent.
Another variant is shown by DE-OS No. 2 348 654 and a prototype thereof in FIGS. 7 and 8 of DE-OS No. 2 540 302. Whilst this embodiment avoids aggressive clamping surfaces, it is however ineffective with a horizontal direction of belt withdrawal. The clamping effect is insufficient; it is associated with slip. In today's vehicles with large occupants (corresponding to a 95% dummy), horizontal belt withdrawal onto the shoulder of the occupant is possible. Moreover, in this version, which is always coupled with an electromagnet for release, there exists a relatively large path loss in the belt as a result of the large pivot angle which makes itself apparent as unfavourable initial displacement of the occupant.
The invention is based on the object of providing a deflection mounting with means for direct arresting of the belt in which the clamping process takes place immediately in the shortest path without damage to the belt and without slip and the belt withdrawal direction remains without disadvantageous influence.
This problem is solved according to the invention in that a two-stage arresting device is provided in such manner that with usual locking not under accident conditions, upon exceeding of a predetermined deceleration (0.4 g) a first locking action in the form
REFERENCES:
patent: 4185791 (1980-01-01), Takada
patent: 4371126 (1983-02-01), Tsuge et al.
patent: 4470617 (1984-09-01), Yamada et al.
patent: 4547018 (1985-10-01), Cunningham
Britax-Kolb GmbH & Co.
Love John J.
Weaver Ross
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