Winding – tensioning – or guiding – Reeling device – With spring motor
Patent
1996-10-11
1999-03-16
Nguyen, John Q.
Winding, tensioning, or guiding
Reeling device
With spring motor
280807, 60905, B65H 7548, B60R 2234
Patent
active
058819622
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a rotary tightening device for a safety belt, particularly in motor vehicles, having a belt retractor, whose belt take-up shaft upon triggering of the rotary tightening device coupled thereto is rotated in the take-up direction of the safety belt, there being associated with the belt take-up shaft, as a drive, a driving wheel in whose plane the housing of the belt retractor forms a channel, which embraces the driving wheel over at least part of its periphery, for the through passage of mass bodies acting as driving means upon the driving wheel and lying loosely adjacent to one another in the channel.
The basic construction of a rotary tightening device having the features mentioned above is described in DE 29 31 164 A1; in the known rotary tightening device, the belt take-up shaft is provided with a driving wheel, the housing in the plane of the driving wheel having a channel which embraces the driving wheel over part of its periphery; in said channel, mass bodies are driven under the action of a pyrotechnic drive out of a tube disposed tangentially to the driving wheel or the channel and as a result of their friction-locking connection to the driving wheel, which for said purpose is provided with a circumferential contoured groove, set said driving wheel in rotation as they run through the channel. According to an embodiment, the mass bodies may take the form of balls made of a suitably hard plastics material. An outlet opening for the mass bodies may be provided at the end of the channel, the mass bodies exiting from the channel through said outlet opening and passing into a suitably provided receiving container.
A drawback of said known rotary tightening device is that the drive is effected through friction locking; consequently, on the one hand, considerable energy is lost and, on the other hand, it is difficult to tune the contoured groove and the mass bodies to one another in such a way as to produce a defined friction lock and prevent the mass bodies from becoming wedged or sliding through without power transmission. A further drawback associated with the known rotary tightening device is that-when the hard mass bodies encounter the driving wheel, because the channel for sealing reasons has only slight clearance, a mutual blocking between the periphery of the driving wheel and the mass bodies may arise in the channel, thereby impairing the efficiency of the drive in the event of triggering.
The object of the invention is therefore to improve a rotary tightening device having the features described initially in such a way that the transmission of the drive power, which is imparted to the mass bodies, to the tightening rotation of the belt take-up roller is improved.
SUMMARY OF THE INVENTION
A rotary tightening device for a safety belt according to the present invention is primarily characterized by: supported in the housing, the belt-take-up shaft having one end of the safety belt connected thereto and, upon triggering of the rotary tightening device, being rotated in a belt take-up direction of the safety belt; plane of the drive wheel and extending at least partially about a circumference of the drive wheel; the drive wheel; bodies are received for driving the drive wheel, wherein a spacing of the gearing is substantially identical to a spacing between the mass bodies.
The gearing is designed such that the mass bodies, when received in the gearing, contact one another.
The gearing is preferably comprised of recesses projecting radially inwardly from the circumference of the drive wheel.
The gearing is advantageously comprised of cup-shaped recesses at the circumference of the drive wheel, the cup-shaped recesses having a shape matching a shape of the mass balls.
The cup-shaped recesses are expediently positioned along the entire circumference and are contiguous.
The cup-shaped recesses are preferably positioned along the entire circumference and slightly overlap one another.
The mass bodies are balls and the cup-shaped recesses are spherical
REFERENCES:
patent: 3552222 (1971-01-01), Eck
patent: 5690295 (1997-11-01), Steinberg et al.
Barckmann Jorg
Butenop Klaus
Kroger Doris
Rade Rene
Schmidt Thomas
Autoliv Development AB
Nguyen John Q.
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