Seat belt retractor and controlling method of the same
First Claim
1. A seat belt retractor, comprising:
- a base;
a bobbin around which a webbing is to be wound and coupled with said webbing;
a torsion bar inserted through said bobbin and rotatably supported by said base, said torsion bar being connected integrally with said bobbin on the one end side thereof;
first lock structure for making a first condition in which the other end side of said torsion bar is connected with the base and a second condition in which the other end side of said torsion bar is disconnected with the base;
control members, in accordance with the winding amount of the webbing, switched between an operable position causing said first lock structure to be in said first condition and an inoperable position in which said first lock structure is independent of said control members;
a second lock structure capable for making a coupling condition in which said base and said bobbin are coupled with each other and a decoupling condition in which said base and said bobbin are decoupled with each other, wherein when said control members is in said operable position, said second lock structure is brought in said coupling condition.
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Accused Products
Abstract
A seat belt retractor according to the present invention comprises a torsion bar 2 which is connected integrally with a bobbin 3 on one end side thereof and is connected integrally with a locking base 5 on the other end side thereof, a pawl 16 for preventing the rotation of the locking base 5 in the webbing pull-out direction thereof, a ratchet wheel 18 for bringing the pawl 16 into engagement with an engaging internal teeth 25 in a vehicle emergency, a control plate 65 which, in accordance with the winding amount of a webbing 50, positions a lock lever 55 at a first position in which the lock lever 55 is engaged with the ratchet wheel 18 and the pawl 16 is engaged with the engaging internal teeth 25 or at a second position in which the lock lever 55 is not engaged with the ratchet wheel 18, and a lock member 80 which, when the lock lever 55 is positioned at the first position, can be engaged with the ratchet teeth 3b of the bobbin 3 to thereby prevent the rotation of the bobbin 3 in the webbing pull-out direction thereof. Accordingly, it is possible to provide an improved seat belt retractor which can switch an energy absorbing mechanism between its operation condition and its non-operation condition by use of a simple structure.
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Citations
12 Claims
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1. A seat belt retractor, comprising:
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a base; a bobbin around which a webbing is to be wound and coupled with said webbing; a torsion bar inserted through said bobbin and rotatably supported by said base, said torsion bar being connected integrally with said bobbin on the one end side thereof; first lock structure for making a first condition in which the other end side of said torsion bar is connected with the base and a second condition in which the other end side of said torsion bar is disconnected with the base; control members, in accordance with the winding amount of the webbing, switched between an operable position causing said first lock structure to be in said first condition and an inoperable position in which said first lock structure is independent of said control members; a second lock structure capable for making a coupling condition in which said base and said bobbin are coupled with each other and a decoupling condition in which said base and said bobbin are decoupled with each other, wherein when said control members is in said operable position, said second lock structure is brought in said coupling condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A seat belt retractor, comprising:
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a substantially cylindrical bobbin around which a webbing is to be wound; a torsion bar inserted through the bobbin and rotatably supported by a retractor base, the torsion bar being connected integrally with the bobbin on the one end side thereof and connected integrally with a locking base on the other end side thereof; first lock member for bringing the locking base into engagement with the retractor base to thereby prevent the rotation of the locking base in the webbing pull-out direction thereof; lock operating member for operating the first lock member in a vehicle emergency; and control members, in accordance with the winding amount of the webbing, for positioning an engaging member at a first position in which the engaging member is engaged with the lock operating member to thereby operate the first lock member or at a second position in which the engaging member is not engaged with the lock operating member, wherein said control members includes second lock member engageable with the locking base side end portion of said bobbin to prevent the rotation of said bobbin in the webbing pull-out direction thereof and, when said engaging member is positioned at said first position, operates said second lock member.
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10. A method of controlling a seat belt retractor including all of an emergency lock mechanism, an automatic lock mechanism and an energy absorbing mechanism, said method comprising the steps of:
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keeping the automatic lock mechanism in inoperable condition while both of the emergency lock mechanism and the energy absorbing mechanism are being kept in operable condition; switching, in accordance with the winding amount of a webbing wound by said retractor, said automatic lock mechanism from the inoperable condition to operable condition and simultaneously switching said emergency lock mechanism and said energy absorbing mechanism from the operable condition to inoperable condition. - View Dependent Claims (11, 12)
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Specification