Button making
Patent
1998-09-04
2000-05-30
Barfield, Anthony D.
Button making
297478, 280806, B60R 2236
Patent
active
060686642
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a tightening device for safety belts comprising a cable movable by a drive in a tightening direction and guided about a deflection device, whereby one end of the cable is connected to the drive and the free end is connected to a component of the safety belt. In the area of the deflection device a return lock is provided that is active upon movement of the cable counter to the tightening direction.
Such a tightening device relating to buckle tighteners with the aforementioned features is described in European patent 0 186 880. The cable supporting at one end the belt buckle is guided about a deflection block secured at the vehicle and having a deflection channel for the cable. The other end is connected to the piston of a pyrotechnical drive device since after completion of the tightening movement, loading of the belt buckle in a direction counter to the tightening direction will occur, the pyrotechnical drive device, respectively, its piston is provided with a return lock. This return lock, in a special embodiment of the tightening device known from European patent 01 86 880, has already been moved away from the drive device into the area of deflection, i.e., into the deflection block. For this purpose in the deflection block a chamber is provided for receiving two clamping jaws that surround the cable and upon movement within the chamber will clamp the cable.
The known tightening device has the disadvantage that since the return lock is arranged in the area of the drive device, the parts of the drive device, especially the piston secured at the cable, must be designed for respective loading forces, and inasmuch as the return lock is arranged in the area of the deflection device, the deflection block requires a complicated design including anchoring of the deflection block at the vehicle in order to be able to withstand respective forces.
It is therefore an object of the invention to simplify for a tightening device the deflection device of the cable and the return lock and to simultaneously provide a safely operating return lock for the cable that is easy to install.
SUMMARY OF THE INVENTION
The invention is based on the principle that the deflection device is embodied as a rotatably supported eccentric pawl whose rotation direction resulting from movement of the cable in the tightening direction is stopped by a stop. The eccentric pawl, in the direction of the cable extending between the drive and the deflection device, has an elongate shape. At one end it has a deflection end about which the cable is guided for deflection into the tightening direction, and at its end opposite the deflection end it is provided with an eccentric arc which engages the cable upon movement of the cable counter to the tightening direction end serves as a return lock, whereby the cable is guided between the eccentric pawl and a counter plate.
From U.S. Pat. No. 3,287,062 a clamping device comprising an eccentric pawl is known in a safety belt system for the belt member, whereby the belt member is guided between the eccentric pawl having an outer toothing and a counter plate such that pulling at the belt member in the belt removal direction results in a pivoting of the eccentric pawl into its clamping position. In this known embodiment, the eccentric pull is of an angular design whereby the deflection portion and the tooth clamping portion at the eccentric pawl are directly adjacent to one another.
The invention has the advantage that the movement of the cable is facilitated across the deflection end of the eccentric pawl because enclosure of the cable is realized only directly before the drive device within the straight portion by the counter plate arranged at the eccentric pawl. The locking of the cable required for a return lock action is realized in a simple manner within the deflection device whereby the eccentric pawl itself acts as a locking element for securing the cable at the correlated counter plate. Due to the arrangement of the locking means, acting as a retu
REFERENCES:
patent: 3287062 (1966-11-01), Board et al.
patent: 4840325 (1989-06-01), Higuchi et al.
patent: 4999004 (1991-03-01), Skanberg et al.
patent: 5340152 (1994-08-01), Fohl
patent: 5415431 (1995-05-01), Omura
patent: 5533756 (1996-07-01), Dybro et al.
Mayer Josef
Meyer Bernhard
Autoliv Development AB
Barfield Anthony D.
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