JP6373249B2 - Rocking tongue - Google Patents

Description

  The present invention relates to a locking tongue, and more particularly to a locking tongue that is detachably coupled to a buckle of a seat belt device.

  2. Description of the Related Art Conventionally, in vehicles such as automobiles, a so-called three-point seat belt device has been proposed for protecting a driver and a passenger when a vehicle collides. In a three-point seat belt device, when the tongue is properly coupled to the buckle, a lap belt that extends across the waist of the occupant sitting in the seat and a shoulder belt that extends across the chest of the occupant Protects passengers.

  Further, the webbing can normally be freely pulled out from the retractor, and the occupant is fastened to a predetermined position. In the event of a vehicle collision, the retractor is locked by, for example, an inertia mechanism to prevent the webbing from being pulled out further. As a result, the webbing securely holds the occupant in place on the seat during a collision.

  In a vehicle collision, basically, the retractor is locked and the webbing is not pulled out. At this time, the tension on the lap side (waist belt side) increases, but the tension on the shoulder side (shoulder belt side) also increases as the lap side tension increases. In order to prevent this, the locking member arranged in the tongue is moved to clamp the webbing inserted into the tongue webbing insertion hole to prevent the webbing from moving, and the shoulder belt and the lap belt are separated. A locking tongue has been devised (see, for example, Patent Documents 1 and 2).

International Publication WO2012 / 105762 Japanese Patent Laying-Open No. 2015-3568

  By the way, in the locking tongue, further improvement is required in the clamping performance of the webbing by the lock member at the time of a vehicle collision. In particular, there is a problem that the size and weight of the tongue increase as the stroke amount of the lock member increases.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a locking tongue capable of improving the clamping performance at the time of a vehicle collision.

(1) A tongue body that can be coupled to the buckle and has a webbing insertion hole through which the webbing is inserted;
A lock member held by the tongue main body so as to be movable in the webbing insertion hole;
A locking tongue that prevents the movement of the webbing by clamping the webbing inserted through the webbing insertion hole by moving the locking member in a predetermined direction,
Any one of the mutually opposing surfaces constituting the webbing insertion hole has a guide surface capable of guiding the movement of the lock member,
The webbing is inserted through the webbing insertion hole so as to pass between the lock member and any one of the opposing surfaces.
The lock member has a slide surface that can slide in contact with the guide surface, and a convex bump portion that protrudes from the slide surface to the guide surface side of the webbing insertion hole,
The bump portion is normally arranged so as to intersect with a virtual plane including the guide surface, apart from a position facing the guide surface,
When a force of a predetermined value or more is applied to the webbing, the lock member is pressed by the tension of the webbing, and the slide surface of the lock member slides in the predetermined direction along the guide surface of the webbing insertion hole. The bump portion rides on the guide surface, and the lock member rotates, whereby the webbing is clamped by the lock member and the other surface to prevent the webbing from moving. Tongue.
(2) a tongue body that can be coupled to the buckle and has a webbing insertion hole through which the webbing is inserted;
A lock member held by the tongue main body so as to be movable in the webbing insertion hole;
A locking tongue that prevents the movement of the webbing by clamping the webbing inserted through the webbing insertion hole by moving the locking member in a predetermined direction,
Any one of the mutually opposing surfaces constituting the webbing insertion hole has a guide surface capable of guiding the movement of the lock member,
The webbing is inserted through the webbing insertion hole so as to pass between the lock member and any one of the opposing surfaces.
The lock member has a slide surface that can slide in contact with the guide surface, and a convex bump portion that protrudes from the slide surface to the guide surface side of the webbing insertion hole,
The bump portion is normally provided so as to protrude from a virtual plane extending from the slide surface apart from a position facing the guide surface,
When a force of a predetermined value or more is applied to the webbing, the lock member is pressed by the tension of the webbing, and the slide surface of the lock member slides in the predetermined direction along the guide surface of the webbing insertion hole. The bump portion rides on the guide surface, and the lock member rotates, whereby the webbing is clamped by the lock member and the other surface to prevent the webbing from moving. Tongue.
(3) The locking tongue according to (1) or (2), wherein at least one of the guide surface of the webbing insertion hole and the slide surface of the lock member is a flat surface.
(4) The rocking tongue according to any one of (1) to (3), wherein the webbing insertion hole has a wedge shape that becomes narrower in the predetermined direction by the surfaces facing each other. .
(5) The locking tongue according to any one of (1) to (4), wherein the locking member has a wedge shape that gradually becomes narrower in the predetermined direction.
(6) In any one of (1) to (5), any one of the surfaces facing each other extends in the predetermined direction from any one of the surfaces facing each other. Rocking tongue.
(7) A seat belt device comprising the locking tongue according to any one of (1) to (6).

According to the locking tongue of the present invention, one of the mutually opposing surfaces constituting the webbing insertion hole has a guide surface capable of guiding the movement of the lock member, and the webbing faces the lock member. The webbing insertion hole is inserted so as to pass between any one of the surfaces to be performed. Further, the lock member has a slide surface slidably contactable with the guide surface, and a convex bump portion protruding from the slide surface to the guide surface side of the webbing insertion hole. It arrange | positions so that it may space apart from the position which opposes, and the virtual plane containing a guide surface may be crossed. Alternatively, the bump portion is normally provided so as to protrude from a virtual plane extending from the slide surface while being separated from a position facing the guide surface.
When a force greater than a predetermined value acts on the webbing, the lock member is pressed by the tension of the webbing, and after the slide surface of the lock member slides in a predetermined direction along the guide surface of the webbing insertion hole, the bump portion is The webbing is clamped by the lock member and the other surface by preventing the movement of the webbing by riding on the guide surface and rotating the lock member. Thereby, the stroke amount of a lock member becomes short, and the size and weight of a tongue can be reduced. Further, when the same amount of stroke is applied, a strong clamping force can be obtained.

It is the perspective view which showed typically an example of the seatbelt apparatus provided with the locking tongue by this invention. (A) is a perspective view of a locking tongue, (b) is a perspective view of the locking tongue through which webbing was inserted. (A) is sectional drawing which shows the locking tongue at the time of normal use, (b) is sectional drawing which shows the locking tongue at the time of a lock | rock.

  Hereinafter, a locking tongue according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an example of a three-point seat belt device 1 to which a locking tongue 10 is applied. The seat belt apparatus 1 includes a retractor 2 attached to a floor on one side with respect to a vehicle seat (not shown). One end of the webbing 3 is wound around a spring-biased inertia reel inside the retractor 2, and the other end of the webbing 3 is fixed to the vehicle body by a lap anchor 4. A locking tongue 10 is slidably provided on the webbing 3, and the locking tongue 10 is detachably coupled to a buckle 7 provided on the opposite side of the retractor 2 with respect to the seat.

  The webbing 3 extends substantially vertically upward from the retractor 2 to the shoulder anchor 5. The webbing 3 extends obliquely downward from the shoulder anchor 5 to the buckle 7 and constitutes a shoulder belt 6 that is slanted from the shoulder portion to the waist portion of the occupant. Furthermore, the webbing 3 extends in the vehicle width direction from the buckle 7 to the lap anchor 4 and constitutes a lap belt 8 straddling the occupant's waist.

  As shown in FIGS. 2 and 3, the locking tongue 10 can be coupled to the buckle 7 and can move within the tongue main body 11 having the webbing insertion hole 12 through which the webbing 3 is inserted, and the webbing insertion hole 12. And a lock member 30 held by the tongue main body 11. The locking tongue 10 moves the webbing 3 by clamping the webbing 3 inserted into the webbing insertion hole 12 by moving the lock member 30 in a predetermined direction, that is, the shoulder side opening 12a of the webbing insertion hole 12. To prevent.

The tongue body 11 includes a metal tongue plate 15 and a resin mold 16 that partially covers the tongue plate 15 and forms the webbing insertion hole 12. The tongue plate 15 is formed in a substantially T shape by pressing a metal plate material or the like, and has a width direction hole 15 a along the width direction in a wide portion of the tongue plate 15. In addition, an opening 14 that engages with a locking element (not shown) provided inside the buckle 7 is formed in the narrow portion of the tongue plate 15.
Specifically, the resin mold 16 covers the wide portion of the tongue plate 15 including the periphery of the width direction hole 15a, the opening side portion 17 near the opening portion 14 with respect to the width direction hole 15a, and the tongue plate 15 A folded portion 18 that covers the blank 20 and the webbing 3 is folded back and a pair of connecting portions 19 that connect the opening side portion 17 and the folded portion 18 on both sides in the width direction of the webbing insertion hole 12 are provided. Thereby, the webbing insertion hole 12 is configured by the surfaces 21 and 22 of the opening side portion 17 and the folded portion 18 that are opposed to each other, and both the surfaces 21 and 22 are configured by resin.

  Further, the webbing insertion hole 12 has a wedge shape that becomes narrower toward the shoulder side opening 12a by the surfaces 21 and 22 facing each other. Further, one of the surfaces 21 and 22 facing each other (folded side surface) 21 has a guide surface 21 a that is a flat surface that can guide the movement of the lock member 30.

  The webbing 3 is inserted through the webbing insertion hole 12 so as to pass between the lock member 30 and the other surface (opening side surface) 22 of the surfaces 21 and 22 facing each other.

The lock member 30 includes a slide surface 31 that is a flat surface that can be brought into sliding contact with the guide surface 21 a of the webbing insertion hole 12, and a bump portion 32 having a convex curved shape that protrudes from the slide surface 31 toward the guide surface. The lock member 30 has a wedge shape that gradually becomes narrower toward the shoulder-side opening 12a.
The lock member 30 is made of resin, but may be made of other materials such as a metal material. Further, the bump portion 32 is preferably a convex curved surface shape, but may be a convex surface shape and may be a shape having an inclined plane.

As shown in FIG. 3A, in a normal state, the slide surface 31 of the lock member 30 and the guide surface 21 a of the webbing insertion hole 12 abut, and the bump portion 32 faces the guide surface 21 a of the webbing insertion hole 12. It arrange | positions so that it may leave | separate from the position to perform, and the virtual plane P containing the guide surface 21a may be crossed. Further, the lock member 30 is held by the tongue main body 11 so as to be disposed at the above position in a normal state, and is slidably guided by the pair of connecting portions 19, for example.
Further, the bump portion 32 of the present embodiment is provided so as to protrude from a virtual plane P1 extending from the slide surface 31 while being separated from a position facing the guide surface 21a in a normal state. In FIG. 3A, since the slide surface 31 of the lock member 30 and the guide surface 21a of the webbing insertion hole 12 are in contact with each other, the virtual plane P and the virtual plane P1 coincide.

  Note that one of the surfaces 21 constituted by the folded portion 18 of the resin mold 16 is shorter than the other surface 22 in the wrap side opening 12b of the webbing insertion hole 12, so that the bump portion 32 is normally used. Even if the lock member 30 is arranged so as to intersect the virtual plane P, the lock member 30 does not protrude greatly from the webbing insertion hole 12. Specifically, the lock member 30 moves in a region covered with the connecting portion 19 of the resin mold 16 in a side view.

  Therefore, the webbing 3 is freely movable through the webbing insertion hole 12 without being restricted in relative movement with respect to the tongue main body 11 in a normal state.

  On the other hand, when a force greater than a predetermined value is applied to the webbing 3 (that is, the shoulder belt 6 that restrains the upper body of the occupant) in a state in which the locking tongue 10 is attached to the buckle 7, such as at the time of a vehicle collision, FIG. ), The lock member 30 is pressed by the tension of the webbing 3, and the slide surface 31 of the lock member 30 slides toward the shoulder opening 12a along the guide surface 21a of the webbing insertion hole 12 (in the direction of arrow A). ) When the bump portion 32 rides on the guide surface 21a and the lock member 30 rotates (in the direction of arrow B), the webbing 3 is clamped by the lock member 30 and the other surface 22 to prevent the webbing 3 from moving. be able to.

  Therefore, according to the locking tongue 10 of the present embodiment, even if the tension on the lap belt 8 side increases, the webbing 3 is restrained by the lock member 30, so the tension on the lap belt 8 side is on the shoulder belt 6 side. There is no transmission. When the belt is pulled out on the shoulder side in an emergency such as when the load limiter is operated, the webbing 3 on the lap side is locked, so that all the pulled out webbing 3 is used on the shoulder side. Accordingly, it is possible to avoid unnecessary pressure on the occupant chest by the webbing 3.

  In addition, when the vehicle collides, the lock member 30 not only slides but also rotates, so that the stroke amount of the lock member 30 is shortened. Therefore, the size and weight of the locking tongue 10 can be reduced. Further, when the same amount of stroke is applied, a strong clamping force can be obtained.

In addition, this invention is not limited to embodiment mentioned above, Of course, various improvement and deformation | transformation may be performed suitably in the range which does not deviate from the summary of this invention.
For example, the guide surface of the webbing insertion hole and the slide surface of the lock member are preferably flat surfaces as in the present embodiment, but if the lock member operates as in the present embodiment, the guide surface of the lock member is flat. It is not limited to the surface.

DESCRIPTION OF SYMBOLS 1 Seat belt apparatus 2 Retractor 3 Webbing 4 Lap anchor 5 Shoulder anchor 6 Shoulder belt 7 Buckle 8 Lap belt 10 Locking tongue 11 Tongue body 12 Webbing insertion hole 12a Shoulder side opening 12b Lap side opening 15 Tongue plate 16 Resin mold 30 Lock member 31 Slide surface 32 Bump part

Claims (7)

A tongue body that is connectable to the buckle and has a webbing insertion hole through which the webbing is inserted;
A lock member held by the tongue main body so as to be movable in the webbing insertion hole;
A locking tongue that prevents the movement of the webbing by clamping the webbing inserted through the webbing insertion hole by moving the locking member in a predetermined direction,
Any one of the mutually opposing surfaces constituting the webbing insertion hole has a guide surface capable of guiding the movement of the lock member,
The webbing is inserted through the webbing insertion hole so as to pass between the lock member and any one of the opposing surfaces.
The lock member has a slide surface that can slide in contact with the guide surface, and a convex bump portion that protrudes from the slide surface to the guide surface side of the webbing insertion hole,
The bump portion is normally arranged so as to intersect with a virtual plane including the guide surface, apart from a position facing the guide surface,
When a force of a predetermined value or more is applied to the webbing, the lock member is pressed by the tension of the webbing, and the slide surface of the lock member slides in the predetermined direction along the guide surface of the webbing insertion hole. The bump portion rides on the guide surface, and the lock member rotates, whereby the webbing is clamped by the lock member and the other surface to prevent the webbing from moving. Tongue. A tongue body that is connectable to the buckle and has a webbing insertion hole through which the webbing is inserted;
A lock member held by the tongue main body so as to be movable in the webbing insertion hole;
A locking tongue that prevents the movement of the webbing by clamping the webbing inserted through the webbing insertion hole by moving the locking member in a predetermined direction,
Any one of the mutually opposing surfaces constituting the webbing insertion hole has a guide surface capable of guiding the movement of the lock member,
The webbing is inserted through the webbing insertion hole so as to pass between the lock member and any one of the opposing surfaces.
The lock member has a slide surface that can slide in contact with the guide surface, and a convex bump portion that protrudes from the slide surface to the guide surface side of the webbing insertion hole,
The bump portion is normally provided so as to protrude from a virtual plane extending from the slide surface apart from a position facing the guide surface,
When a force of a predetermined value or more is applied to the webbing, the lock member is pressed by the tension of the webbing, and the slide surface of the lock member slides in the predetermined direction along the guide surface of the webbing insertion hole. The bump portion rides on the guide surface, and the lock member rotates, whereby the webbing is clamped by the lock member and the other surface to prevent the webbing from moving. Tongue.   3. The locking tongue according to claim 1, wherein at least one of the guide surface of the webbing insertion hole and the slide surface of the lock member is a flat surface.   The rocking tongue according to any one of claims 1 to 3, wherein the webbing insertion hole has a wedge shape that becomes narrower in the predetermined direction by the surfaces facing each other.   The locking tongue according to claim 1, wherein the lock member has a wedge shape that gradually becomes narrower in the predetermined direction.   The locking tongue according to any one of claims 1 to 5, wherein any one of the mutually facing surfaces extends in the predetermined direction with respect to any one of the mutually facing surfaces. .   A seat belt device comprising the locking tongue according to any one of claims 1 to 6.

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