Tongue and seat belt apparatus employing the same

Abstract

During ordinary use (i.e., a non-collision state) a webbing guide and a locking bar are biased in the counter-clockwise direction by the biasing force of the bar spring and are held in their initial positions so that spaces are set. Since a webbing passes through the spaces, a tongue can smoothly slide relative to the webbing. During a vehicle collision, a pulling force exceeding a predetermined value is applied to the webbing in the direction of an occupant's lap and shoulder. By this pulling force, the webbing guide rotates in the clockwise direction and the locking bar rotates in the counter-clockwise direction and linearly moves rightward. Therefore, the webbing is clamped between the locking bar and the tongue body. The clamping force at this point includes a force pulling the webbing and the biasing force of a bar spring so that a large clamping force can be obtained.

Description

technical field [0001] The present invention relates to a tongue and a seat belt device using the same. The buckle on the seat belt and fastened to the vehicle body is engaged. Background technique [0002] In the past, the seat belt device installed on the seat of a vehicle such as an automobile used the seat belt to restrict the occupant and prevent the occupant from flying from the seat in an emergency such as a collision or other emergency situation. out to protect the occupants. [0003] As such a seat belt device, in general, a three-point seat belt device is widely known and commonly used. A known general three-point seat belt device has a soft belt constituting a seat belt for restraining an occupant. One end of the soft belt is fixed on the vehicle body, and the other end is guided by the seat belt guide (shoulder anchor) installed on the upper part of the vehicle body such as the center pillar, and then wound around the seat belt roll fixed on the lower part of ...

AI Technical Summary

Problems solved by technology

[0013] However, in the tongue disclosed in Patent Document 2, since the soft belt is inserted through the two insertion holes close to the tongue plate, it can be considered that since the radius of curvature of the soft belt inserted into these insertion holes becomes smaller, the insertion The sliding resistance between the tongue plate and the soft belt becomes larger, making it difficult for the tongue plate to slide smoothly relative to the soft belt

Also, since the locking member is always biased in a direction away from the tongue plate by the torsion spring, there is a problem that the clamping force for clamping and locking the soft belt between the locking member and the tongue plate becomes weak.

[0014] In addition, since the soft belt is clamped by the locking member and the sides of the tongue plate, a large clamping force on the flexible belt cannot be obtained, and there is also a problem that, in order to further increase the clamping force, the locking member and the tongue plate must be connected to each other. Form teeth such as serrations on each pressing surface of the tongue plate, or form the pressing surface into a wavy surface, and additional processing steps are required to form these teeth or wavy surfaces

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