Belt winding and tightening combination with a force limiter
First Claim
1. A safety belt reeling device comprising:
- a belt reeling shaft (10) lockable by a vehicle-sensitive and/or belt-sensitive locking device;
a tightening device;
a tightening coupling connecting said tightening device to said belt reeling shaft when said tightening device is actuated;
said tightening device comprising a drive disc (18,
38) and a drive device (37) for driving said drive disc (18,
38);
a force limiting device comprising a torsion bar (12) connected to said belt reeling shaft (10) and to a stationary abutment;
a pawl coupling activated by a tightening movement of said tightening device;
said pawl coupling comprising at least one force limiting pawl for switching on or off said force limiting device as a function of functional states of said safety belt reeling device;
said pawl coupling further comprising a coupling ring (23,
45) performing a relative rotation by an angular distance relative to said belt reeling shaft (10) in a rotational direction of said belt reeling shaft (10) defined by said tightening movement, wherein said relative rotation of said coupling ring (23,
45) is realized by the mass inertia of said belt reeling shaft (10), effective at the start of said tightening movement, relative to said drive disc (18,
38);
a forced control (28, 29;
49,
51) controlling said force limiting pawl (27,
42) for switching on or off said force limiting device.
1 Assignment
0 Petitions
Accused Products
Abstract
A safety belt reeling device has a belt reeling shaft lockable by a vehicle-sensitive and/or belt-sensitive locking device. A tightening device is provided and a tightening coupling connects the tightening device to the belt reeling shaft when the tightening device is actuated. The tightening device has a drive disc and a drive device for driving the drive disc. A force limiting device having a torsion bar is connected to the belt reeling shaft and to a stationary abutment. A pawl coupling is activated by a tightening movement of the tightening device and the pawl coupling has at least one force limiting pawl for switching on or off the force limiting device as a function of functional states of the safety belt reeling device. The pawl coupling also has a coupling ring performing a rotation by an angular distance relative to the belt reeling shaft in a rotational direction of the belt reeling shaft defined by the tightening movement, wherein the relative rotation of the coupling ring is realized by the mass inertia of the belt reeling shaft, effective at the start of the tightening movement, relative to the drive disc. A forced control controlling the force limiting pawl is provided for switching on or off the force limiting device.
55 Citations
11 Claims
-
1. A safety belt reeling device comprising:
-
a belt reeling shaft (10) lockable by a vehicle-sensitive and/or belt-sensitive locking device; a tightening device; a tightening coupling connecting said tightening device to said belt reeling shaft when said tightening device is actuated; said tightening device comprising a drive disc (18,
38) and a drive device (37) for driving said drive disc (18,
38);a force limiting device comprising a torsion bar (12) connected to said belt reeling shaft (10) and to a stationary abutment; a pawl coupling activated by a tightening movement of said tightening device; said pawl coupling comprising at least one force limiting pawl for switching on or off said force limiting device as a function of functional states of said safety belt reeling device; said pawl coupling further comprising a coupling ring (23,
45) performing a relative rotation by an angular distance relative to said belt reeling shaft (10) in a rotational direction of said belt reeling shaft (10) defined by said tightening movement, wherein said relative rotation of said coupling ring (23,
45) is realized by the mass inertia of said belt reeling shaft (10), effective at the start of said tightening movement, relative to said drive disc (18,
38);a forced control (28, 29;
49,
51) controlling said force limiting pawl (27,
42) for switching on or off said force limiting device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification