Seat belt winding device
First Claim
1. A seat belt winding device with a clamping mechanism for directly holding a webbing in an emergency of a vehicle, comprising:
- a retractor base;
a lower plate fixed to the retractor base;
a movable clamp member for holding a webbing between the lower plate and the clamp member, the clamp member including;
a plurality of clamp teeth for clamping and engaging the webbing to a webbing opposing surface of the clamp member;
a flat portion located on an opposite side of the webbing opposing surface;
a rear edge located on a rear end of the flat portion; and
a flat surface located in a front end of the clamp member;
an upper plate for guiding the clamp member to a webbing holding position, the upper plate including;
an inclined portion sliding on the flat portion of the clamp member;
a guide portion extending from a front end of the inclined portion in parallel to the webbing; and
a stopper portion coupled to a front end of the guide portion, the inclined portion and guide portion being deformed by the rear edge of the clamp member in accordance with a movement of the clamp member in a webbing draw-out direction when a load acting on the upper plate exceeds a predetermined value;
a winding shaft rotatably supported by the retractor base; and
a bobbin rotated integrally with the winding shaft, the bobbin including a plastically deforming member deformed by a load to be applied to the webbing on an outer periphery of the bobbin.
1 Assignment
0 Petitions
Accused Products
Abstract
In a seat belt winding device with a clamping mechanism for directly holding a webbing in an emergency of a vehicle, since the plastic deformation is repeated in stages in both of a clamp supporting device and plastically deforming members, a larger amount of kinetic energy can be absorbed on the side of the seat belt winding device. Further, when the webbing holding by the clamping mechanism is removed, not only the diameter of a plastically deforming member of a bobbin can be reduced greatly since the plastically deforming members project in the radial direction of the bobbin, but also the deforming direction of the plastically deforming members due to the tightening of the webbing can be specified because end surfaces of the plastically deforming members are respectively formed in an inclined surface Which is inclined in a specific direction. This allows the substantial winding diameter of the bobbin to be reduced uniformly and positively.
21 Citations
20 Claims
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1. A seat belt winding device with a clamping mechanism for directly holding a webbing in an emergency of a vehicle, comprising:
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a retractor base; a lower plate fixed to the retractor base; a movable clamp member for holding a webbing between the lower plate and the clamp member, the clamp member including; a plurality of clamp teeth for clamping and engaging the webbing to a webbing opposing surface of the clamp member; a flat portion located on an opposite side of the webbing opposing surface; a rear edge located on a rear end of the flat portion; and a flat surface located in a front end of the clamp member; an upper plate for guiding the clamp member to a webbing holding position, the upper plate including; an inclined portion sliding on the flat portion of the clamp member; a guide portion extending from a front end of the inclined portion in parallel to the webbing; and a stopper portion coupled to a front end of the guide portion, the inclined portion and guide portion being deformed by the rear edge of the clamp member in accordance with a movement of the clamp member in a webbing draw-out direction when a load acting on the upper plate exceeds a predetermined value; a winding shaft rotatably supported by the retractor base; and a bobbin rotated integrally with the winding shaft, the bobbin including a plastically deforming member deformed by a load to be applied to the webbing on an outer periphery of the bobbin. - View Dependent Claims (2)
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3. A seat belt winding device with a clamping mechanism for directly holding a webbing in an emergency of a vehicle, comprising:
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a retractor base; a lower plate fixed to the retractor base; a movable clamp member for holding a webbing between the lower plate and the clamp member, the clamp member including clamp teeth for clamping and engaging the webbing to a webbing opposing surface of the clamp member; an upper plate for guiding the clamp member to a webbing holding position; and a holding means for preventing a movement of the upper plate in a webbing draw-out direction, the holding means including a plastically deforming portion deformed in accordance with a movement of the clamp member in the webbing draw-out direction; a winding shaft rotatably supported by the retractor base; and a bobbin rotated integrally with the winding shaft, the bobbin including a plastically deforming member deformed by a load applied to the webbing on an outer periphery of the bobbin, wherein the upper plate is fixed to the holding means and so structured that the plastically deforming portion of the holding means is plastically deformed in accordance with the movement of the clamp member in the webbing draw-out direction to move in the webbing draw-out direction while keeping the webbing holding force of the clamp member when a load acting on the holding means exceeds a predetermined value. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A seat belt winding device for a webbing in a vehicle, comprising:
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a retractor base; a winding shaft rotatably supported by the retractor base; and a bobbin rotated integrally with the winding shaft, the bobbin including a plastically deforming member on an outer periphery of the bobbin, the plastically deforming member being of a strength to be deformed by a load acting on the webbing which exceeds a first predetermined value; clamping means disposed in the retractor base for directly holding the webbing in an emergency of the vehicle, the clamping means releasing the webbing from holding when a load acting on the webbing exceeds a second predetermined value. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification