초록 ▼

A belt retractor for a seatbelt comprising a retractor pawl which blocks the seatbelt from being pulled out of the belt retractor in the event of an accident, and having a tightening device which tightens the seatbelt in a hazardous situation, the tightening device includes a tightening pawl which,

A belt retractor for a seatbelt comprising a retractor pawl which blocks the seatbelt from being pulled out of the belt retractor in the event of an accident, and having a tightening device which tightens the seatbelt in a hazardous situation, the tightening device includes a tightening pawl which, in a blocking position, blocks the belt retractor in the belt uncoiling direction and, in a release position, leaves the belt retractor unaffected. The tightening pawl is assigned a sensor which monitors the position of the tightening pawl and transmits a signal indicating the position of the tightening pawl to a control device of the tightening device.

대표청구항 ▼

What is claimed is: 1. A belt retractor for a seat belt comprising: a belt reel; a retractor pawl which blocks the uncoiling of the seatbelt from the belt reel in the event of an accident; and a tightening device which tightens the seatbelt in a hazardous situation; wherein the tightening device in

What is claimed is: 1. A belt retractor for a seat belt comprising: a belt reel; a retractor pawl which blocks the uncoiling of the seatbelt from the belt reel in the event of an accident; and a tightening device which tightens the seatbelt in a hazardous situation; wherein the tightening device includes a tightening pawl which, in a blocking position, blocks the belt reel in a belt uncoiling direction and, in a release position, leaves the belt reel unaffected; wherein the tightening pawl is assigned a sensor which monitors the position of the tightening pawl and transmits a signal specifying the position of the tightening pawl to a control device, and wherein the control device is configured so that when a signal is received from the sensor indicating that the tightening pawl has moved into the release position, the control device stops rotation of the belt reel in a tightening direction. 2. The belt retractor according to claim 1, wherein the belt retractor includes a toothed ratchet wheel which is connected in a rotationally fixed manner to the belt reel and interacts with the tightening pawl. 3. The belt retractor according to claim 2, wherein the tightening pawl, in the blocking position, forms a form-fitting connection with a tooth of the toothed ratchet wheel. 4. The belt retractor according to claim 3, wherein the form-fitting connection is formed by an undercut. 5. The belt retractor according to claim 2, wherein the tightening pawl is connected to a restoring device which automatically separates the tightening pawl from the toothed ratchet wheel as soon as there is no longer a form-fitting connection between the tightening pawl and the toothed ratchet wheel. 6. The belt retractor according to claim 5, wherein the restoring device is formed by a restoring spring. 7. The belt retractor according to claim 1, wherein the tightening device is configured to rotate the belt reel in the belt coiling-up direction to release the blocking position of the tightening pawl. 8. The belt retractor according to claim 1, wherein the tightening device rotates the belt reel exclusively in the belt coiling-up direction until the sensor produces a signal which indicates the release position of the tightening pawl. 9. The belt retractor according to claim 1, wherein the tightening device is configured to continuously monitor the position of the tightening pawl with the sensor during the presence of a hazardous situation. 10. The belt retractor according to claim 9, wherein the tightening device is configured to repeat the tightening process of the seatbelt if the sensor indicates that the tightening pawl is in the release position when a hazardous situation has not ended. 11. The belt retractor according to claim 1, wherein the sensor is a Hall sensor and the tightening pawl is at least partially magnetic. 12. The belt retractor according to claim 1, wherein the sensor is an optical sensor. 13. The belt retractor according to claim 12, wherein the optical sensor forms a light barrier. 14. The belt retractor according to claim 1, wherein the sensor is formed by an electrical switching contact.