JP2015116949A - Seatbelt device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seatbelt device capable of alleviating impact by extending width of a belt with a simple structure.SOLUTION: One end part of a belt body 50 is wound by a winding device 10 in a drawable manner. The other end of the belt body 50 is fixed on an anchor 20. A part of the belt body 50 is folded in an extendable manner so as to form a folded part 51. On a belt part with which the folded part 51 of outside surface of the belt body 50 is formed, an outside belt part 60 is arranged. Both edge parts in width direction of the outside belt part 60 are attached each other into a cylindrical shape so as to cover and hold the folded part 51 in a folded state. When tensile force over a predetermined value is subjected to the belt body 50, a jointing part 65 is released and the outside belt part 60 is extended in width direction so that the folded part 51 of the belt body 50 is extended.

Description

  The present invention relates to a seat belt device for a vehicle seat.

In a seat belt device for protecting a seated person sitting on a vehicle seat, when a tensile force of a predetermined value or more is applied to the belt body, the belt width is widened to reduce the impact. It is known (see, for example, Patent Document 1).
In the seat belt device disclosed in Patent Document 1, the belt body includes a bag-shaped portion configured in a bag shape. The bag-like portion has a fragile portion that is broken by an increase in its internal pressure. At the time of a collision, liquid is injected into the bag-like portion, causing an increase in the internal pressure and breaking the fragile portion. And a belt body is expand | deployed widely by fracture.
Furthermore, a means for injecting a liquid is provided, and the belt body includes one side portion, a central portion, and the other side portion in order in the deployed state.
In the undeployed state, the one side and the other side are folded inward toward the center and narrowed, and the bag is surrounded by the one side, the other side, and the center. The one side part and the other side part are bound to each other in the width direction to constitute a weak part.

JP2013-23160A

  By the way, in the seat belt apparatus disclosed in Patent Document 1, a means for injecting liquid and an apparatus for controlling the operation of the means are required for the bag-like portion of the belt body, which complicates the structure and increases the cost. .

  In view of the above problems, an object of the present invention is to provide a seat belt device capable of reducing the impact by widening the belt width with a simple structure.

In order to solve the above-described problem, a seat belt device according to a first aspect of the present invention is a part of a belt body in which one end portion is retractably wound on a winding device and the other end portion is fixed to an anchor. Is formed with a foldable folding part,
An outer belt portion is disposed on a belt portion where the folding portion of the outer surface of the belt body is provided,
The outer belt part is bound to the folded state so as to cover the folded part by joining both edges in the width direction in a cylindrical shape by the joined part,
When a tensile force of a predetermined value or more is applied to the belt body, the joining portion is detached, the outer belt portion is expanded in the width direction, and the folding portion of the belt body is extended. It is characterized by.

According to the first invention, when a tensile force of a predetermined value or more is applied to the belt body, the joint portion of the outer belt portion is detached, and the outer belt portion is developed in the width direction by its own restoring force, and the belt body is folded. The tatami part is extended. Thereby, the impact can be reduced.
In this way, the impact can be reduced by widening the belt width with a simple structure.
In addition, the folding part of the belt body is constrained by the outer belt part, and the folding part is extended when a tensile force of a predetermined value or more is applied to the belt body, so that a simple force limiter function can be obtained. It is done.

A seat belt device according to a second invention of the present invention is the seat belt device of the first invention,
One end portion of the joint portion of the outer belt portion is connected to the belt body,
When a tensile force of a predetermined value or more is applied to the belt body, the folding portion of the belt body is extended while removing the joint portion.

  According to the second invention, when a tensile force of a predetermined value or more is applied to the belt body, the folding part of the belt body is extended, and the extension of the folding part causes the outer belt part connected to the belt body to The joint is peeled off and removed. For this reason, the junction part of an outer side belt part can be removed reliably. As a result, the outer belt portion expands in the width direction by its own restoring force.

It is a perspective view which shows simply the arrangement | positioning state of the seatbelt apparatus and vehicle seat which concern on Example 1 of this invention. It is explanatory drawing which shows the state by which the outer side belt part was arrange | positioned so that the folding part of a belt body might be covered. It is a longitudinal cross-sectional view which shows the relationship between the belt body, the outer side belt part, and joining tape which follow the III-III line of FIG. It is explanatory drawing which shows the state which the folding part of a belt body expand | extends and the junction part of an outer side belt part remove | deviates and expand | deploys when the tensile force more than predetermined value acts on a belt body. It is a longitudinal cross-sectional view which shows the relationship between the belt body, outer belt part, and joining tape which follows the VV line | wire of FIG.

  A mode for carrying out the present invention will be described in accordance with an embodiment.

A first embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a seat belt device for protecting a seated person sitting on a vehicle seat 1 having a seat cushion 2 and a seat back 3 includes a winding device 10, an anchor 20, and a belt guide member. 11, a tongue plate 30, a buckle 40, a belt body 50, and an outer belt portion 60.

The winding device 10 and the anchor 20 are respectively disposed in the vicinity of the lower portion of the pillar portion of the vehicle body that is located on the lateral side of the vehicle seat 1 outside the vehicle. The winding device 10 may be disposed in the seat back 3 of the vehicle seat 1, and the anchor 20 may be disposed on the vehicle outer side of the side frame portion of the seat cushion 2.
The belt guide member 11 is disposed in the vicinity of the upper portion of the pillar portion of the vehicle body. The belt guide member 11 may be disposed in the vicinity of the upper surface of the shoulder portion of the seat back 3.
The buckle 40 is disposed on the vehicle inner side of the side frame portion of the cushion frame of the seat cushion 2.

As shown in FIGS. 1 and 2, the belt body 50 has a long belt shape, and one end thereof is wound around the winding device 10 so as to be able to be pulled out.
The belt body 50 passes through the insertion hole 12 of the belt guide member 11, and the other end is fixed to the anchor 20.
The tongue plate 30 is movably inserted into the belt body 50 through the insertion hole 31.
As shown in FIGS. 1 to 3, a folding part 51 is formed in a part of the belt body 50 and is folded in an approximately S shape so as to be stretchable.

As shown in FIGS. 2 and 3, an outer belt portion 60 is disposed on the belt portion where the folding portion 51 on the outer surface of the belt body 50 is provided.
The outer belt portion 60 is formed of a belt material having a width dimension that is twice as large as the belt width dimension of the belt body 50, and one end portion in the belt direction is coupled (connected) to the inner side surface of the belt body 50 by sewing or the like. 55.

  Both edges in the width direction of the outer belt portion 60 are joined in a cylindrical shape by a joining tape 66 as the joining portion 65, thereby covering the folding portion 51 of the belt body 50 and restraining it in a folded state. Thus, in a normal use state of the seat belt device, the folding part 51 of the belt body 50 is set to be restrained by the outer belt part 60 without being extended.

Further, when a tensile force of a predetermined value or more is applied to the belt body 50, the folding portion 51 of the belt body 50 is extended while peeling off the joining tape 66 as a joining portion, and all the joining tape 66 is peeled off. The outer belt portion 60 is set to be developed in the width direction.
That is, in the first embodiment, the joining tape 66 is attached over the entire length in the belt direction at both edges in the width direction of the outer belt portion 60, and the joining tape 66 is folded back and extended from one end thereof. The extending end portion of the portion 67 is coupled (connected) 68 to the outer surface of the belt body 50 by sewing or the like. The extending portion 67 of the bonding tape 66 does not have an adhesive layer and does not have adhesiveness.

The seat belt device according to the first embodiment is configured as described above.
Therefore, in a state where the tongue plate 30 of the belt body 50 is inserted into the buckle 40 and the belt body 50 is stretched over a seated person sitting on the vehicle seat 1, a tensile force greater than a predetermined value is applied to the belt body 50. When the folding portion 51 of the belt body 50 is extended, the joining tape 66 of the outer belt portion 60 connected to the belt body 50 is moved from one end to the other. It peels toward the end.

When the joining tape 66 is peeled from one end portion to the other end portion, the outer belt portion 60 is developed in the width direction by its own restoring force. Then, the belt width in contact with the seated person is widened by the amount that the outer belt portion 60 is expanded in the width direction (see the two-dot chain line in FIG. 1). Thereby, the surface pressure with respect to the seated person is reduced.
As described above, the belt width can be widened and the impact can be reduced with a simple structure.
Moreover, the folding part 51 of the belt body 50 is restrained by the outer side belt part 60, and when the tensile force more than a predetermined value acts on the belt body 50, it has the structure where the folding part 51 is extended, and is simple. A force limiter function is obtained.

In addition, this invention is not limited to the said Example 1, In the range which does not deviate from the summary of this invention, it can implement with a various form.
For example, in the first embodiment, the case where both edges in the width direction of the outer side belt portion 60 are joined in a cylindrical shape by the joining tape 66 is exemplified. However, instead of the joining tape 66, a joining portion such as a fastener or a leash thread is used. It is also possible to join both edges in the width direction of the outer belt portion 60 using

DESCRIPTION OF SYMBOLS 1 Vehicle seat 3 Seat back 10 Winding device 11 Belt guide member 20 Anchor 30 Tongue plate 40 Buckle 50 Belt body 51 Folding part 60 Outer belt part 65 Joining part 66 Joining tape (joining part)

Claims (2)

A part of the belt body in which one end is removably wound on the winding device and the other end is fixed to the anchor is formed with a foldable portion that is folded to be extendable,
An outer belt portion is disposed on a belt portion where the folding portion of the outer surface of the belt body is provided,
The outer belt part is bound to the folded state so as to cover the folded part by joining both edges in the width direction in a cylindrical shape by the joined part,
When a tensile force of a predetermined value or more is applied to the belt body, the joining portion is detached, the outer belt portion is expanded in the width direction, and the folding portion of the belt body is extended. A seat belt device characterized by the above. The seat belt device according to claim 1,
One end portion of the joint portion of the outer belt portion is connected to the belt body,
A seatbelt device characterized in that when a tensile force of a predetermined value or more is applied to the belt body, the folding portion of the belt body is extended while removing the joint portion.

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