Winding – tensioning – or guiding – Reeling device – With spring motor
Patent
1996-01-17
1997-10-28
Jillions, John M.
Winding, tensioning, or guiding
Reeling device
With spring motor
280806, B60R 2246
Patent
active
056810040
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for the rotary drive of a winding shaft of a safety belt automatic winding device, including an energy storing device, adapted to be triggered by a sensor means, a rotary member rotatable by the power storage means and a clutch by means of which the driven rotary member is to be engaged with the winding shaft.
The purpose is that by such an apparatus, in an emergency situation, for example, excessive velocity changes, e.g. in a crash event, prior to blocking the winding shaft, loosely superimposed belt layers on the winding shaft and belt looseness in the safety belt portion applied to the body of the vehicle passenger are removed. Thereby the risk of forward displacement of the body of the passenger is eliminated.
An object of the invention is to provide an apparatus which can be accommodated in a space-saving manner on the automatic belt winding means.
According to the invention, this is achieved in that the rotary member is rotatably accommodated in a casing, there being provided between the rotary member and an inner wall of the casing at least one explosion chamber which turns around an axis due to the rotation of the rotary member, which more particularly takes the form of an impeller or rotary piston, and wherein along the rotation trajectory of the explosion chamber a plurality of energy storage means in the form of propellant gas charges are provided which can be triggered once the explosion chamber has reached the respective locality of the propellant gas charge. The explosion chamber in the case of an impeller takes the form of a pressure space of constant volume and in the case of the rotary piston is formed as an expandable pressure space.
In this manner, a transmission is attained of the force generated in the diverse power storage means onto the winding shaft along the shortest and most direct pathway. In addition, it is possible to so proportion the driving force of the propellant gas charges that successively when igniting the propellant gas charges a progressively increasing thrust is applied onto the rotary member. It is avoided in this manner that at the start of rotation the torque applied by the rotary member is transmitted to the winding shaft in an abrupt manner. Rather, in the case of the invention, a continuously increasing torque is applied to the winding shaft within the brief time available.
The propellant gas charges may be ignited simultaneously.
Preferably the propellant gas charges are ignited successively, more particularly whenever the explosion chamber arrives at the respective locality of the propellant gas charge. For this purpose, each propellant gas charge may be associated with an ignition means which is brought to ignition, controlled by the revolving of the rotary member. However, advantageously the propellant gas charges are so designed in the successive stages that they are ignited by the temperature of the previously ignited propellant gas by auto-ignition. In this manner it is likewise possible to attain a progressively successive ignition of the individual propellant gas charges. A mechanical ignition of the successive propellant gas charges by the rotating rotary member is likewise possible.
In the rotary member a clutch actuating means may be provided. Clutch elements may be brought into a clutch engagement position in which a frictional connection is brought about between the rotary member and the winding shaft by way of the clutch elements, by way of these clutch operating means. The clutch operating means may be so designed that the movements of the clutch elements into the clutch engagement position is brought about by the rotation of the rotary member.
The invention will be further explained by way of working examples with reference to the drawings. There is shown in:
FIG. 1 schematically a working example including a rotary member which is driven like an impeller;
FIG. 2 in a perspective view, a drive means comprising a rotary piston;
FIGS. 3 to 7 in side elevation, various operating positions of the rotary piston
REFERENCES:
patent: 4151967 (1979-05-01), Lindblad
patent: 4230288 (1980-10-01), Fohl
patent: 5351485 (1994-10-01), Hiruta
patent: 5383623 (1995-01-01), Hiruta et al.
patent: 5451008 (1995-09-01), Hamaue
patent: 5485970 (1996-01-01), Steffens
patent: 5505399 (1996-04-01), Schmid et al.
Japanese Abstract JP61040421, Feb. 26, 1986.
Principles of the Wankel Engine by Ted Pipe, 1974.
Jillions John M.
TRW Occupant Restraint Systems GmbH
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