Seat belt retractor
OwnerTakao Katayamainventor
Life of this patent
Estimating the term…
Abstract
A seatbelt retractor of the invention intends to stabilize the stopping position of a seatbelt, and to stabilize the resistance thereof. In order to absorb the energy acting on the seatbelt in case of a vehicle emergency, the seatbelt retractor includes a torsion bar 4 (first energy-absorbing means) being the rotational shaft of a take-up drum, a second energy-absorbing means utilizing the pulling of a wire, and a clutch mechanism which immediately switches a state where the first and second energy-absorbing means absorb the energy acting on the seatbelt in case of a vehicle emergency into a state where only the first energy-absorbing means absorbs the energy.
Claims7
A seatbelt retractor comprises:
- a take-up drum on which webbing is wound;
- a take-up shaft, one end of which is coupled with one end of the take-up drum in a manner that a relative rotation with the take-up drum is impossible, which is biased in the direction of the webbing taken up;
- an emergency lock mechanism which restrains a rotation in the direction of the webbing pulled out;
- a clutch mechanism located near the other end of the take-up shaft;
- a plate body provided close to a side on the other end of the take-up drum, which is provided on the other end of the take-up shaft through the clutch mechanism;
- and
- an energy-absorbing means located between the side of the take-up drum and the plate body, which provides a resistive load by mutually performing a relative rotation;
- wherein the clutch mechanism switches a first state where the plate body is provided on the other end of the take-up shaft in a manner that a relative rotation with the take-up shaft is impossible into a second state where the plate body is provided on the other end of the take-up shaft in a manner that a relative rotation with the take-up shaft is possible, and the clutch mechanism includes a clutch release mechanism which actuates a switching at an arbitrary timing.
A seatbelt retractor comprising:
- a take-up drum on which webbing is wound;
- a torsion bar inserted through the take-up drum, one end of which is coupled with one end of the take-up drum in a manner that a relative rotation with the take-up drum is impossible, which is biased in the direction of the webbing taken up;
- an emergency lock mechanism located on the other end of the torsion bar, which restrains a rotation in the direction of the webbing pulled out;
- a lock actuating device which actuates the emergency lock mechanism in case of a vehicle emergency;
- a clutch mechanism located near the other end of the torsion bar;
- a plate body provided close to a side on the other end of the take-up drum, which is provided on the other end of the torsion bar through the clutch mechanism;
- and
- a second energy-absorbing means located between the side of the take-up drum and the plate body, which provides a resistive load by mutually performing a relative rotation;
- wherein the clutch mechanism switches a first state where the plate body is provided on the other end of the torsion bar in a manner that a relative rotation with the torsion bar is impossible into a second state where the plate body is provided on the other end of the torsion bar in a manner that a relative rotation with the torsion bar is possible, and the clutch mechanism includes a clutch release mechanism which actuates a switching at an arbitrary timing.
Dependencies are inferred from the claim text.