WO2012004931A1

WO2012004931A1 - Seat belt engagement device and seatbelt device provided therewith

Info

Publication number: WO2012004931A1
Application number: PCT/JP2011/003149
Authority: WO
Inventors: 晋平大舘; 良彦河合
Original assignee: タカタ株式会社
Priority date: 2010-07-08
Filing date: 2011-06-03
Publication date: 2012-01-12
Also published as: CN102985298A; JP2012017037A; CN102985298B; JP5603684B2

Abstract

An engagement portion (6b) of a tongue (6) is provided with recesses (6e, 6f) which prevent the engagement portion (6b) from interfering with tongue insertion guide portions (7b₇, 7b₈). When the engagement portion (6b), in a state tilted relative to an engagement portion insertion direction (α), is inserted into a buckle (7), said recesses (6e, 6f) prevent the engagement portion (6b) of the tongue (6) from interfering with the tongue insertion guide portions (7b₇, 7b₈) and rotating, making it possible for the engagement portion (6b) to be inserted in an tilted state into the buckle (7). Consequently, even if the engagement portion (6b) of the tongue (6) is inserted into the buckle (7) in an tilted state, interference of the engagement portion (6b) to the tongue insertion guide portions (7b₇, 7b₈) is prevented, a passenger feels that the tongue (6) is inserted properly, giving the passenger a positive feeling.

Description

Seat belt locking device and seat belt device provided with the same

INDUSTRIAL APPLICABILITY The present invention is used in a seat belt device mounted on a seat of an automobile or other transportation, and the vehicle body side in a state where a seat belt is attached to an occupant by locking a tongue supported by the seat belt to a buckle. TECHNICAL FIELD The present invention relates to a technical field of a seat belt locking device that locks to a seat belt, and a technical field of a seat belt device including the same.

Generally, seat belt devices are arranged in seats of various transportation facilities including automobiles in order to restrain passengers in an emergency such as a collision. Such a seat belt device includes a seat belt locking device having a tongue that is slidably supported by the seat belt, and a buckle that is fixed to the vehicle body or the like and that the tongue is detachably locked. Then, the tongue of the seat belt locking device is locked to the buckle, and the seat belt is locked to the vehicle body while being attached to the passenger, whereby the seat belt restrains the passenger.

As such a conventional seat belt locking device, a taper portion is provided at the tip of the locking portion of the tongue inserted into the buckle, and a projection for guiding the tongue is provided on the buckle, so that the occupant has a belt-like shape of the tongue. When the tongue is inserted into the buckle with the longitudinal direction of the locking part inclined with respect to the normal locking part insertion direction, the taper part of the locking part comes into contact with the protrusion and the longitudinal direction of the locking part is normalized. A seat belt locking device has been proposed in which the tongue in a tilted state can be easily inserted into the buckle by inserting the tongue into the buckle while being changed so as to be in the locking portion insertion direction (for example, Patent Document 1).

Moreover, in the conventional seat belt locking device including the seat belt locking device described in Patent Document 1, the locking hole provided in the locking portion of the tongue is formed in a rectangular shape, and the locking hole The cross section of the buckle latch that enters the door and locks the tongue is formed in a rectangular shape. The tongue is locked to the latch so that the planar inner peripheral surface of the locking hole is in close contact with or substantially in close contact with the planar outer peripheral surface of the latch.

JP 2002-347575 A.

However, in the seat belt locking device described in Patent Document 1, when the occupant is inserted into the buckle with the tongue tilted as described above, the tongue is pivoted while rotating so that the inclination of the tongue is eliminated. Will be inserted. Due to the rotation of the tongue, there is a problem that the occupant feels uncomfortable when inserting the tongue into the buckle, and the feeling of inserting the locking portion is not good.

In addition, in the conventional seat belt locking device in which the locking hole of the locking portion formed in a strip shape is formed in a rectangular shape and the cross section of the latch is formed in a rectangular shape, the locking of the tongue and the latch When a force in a direction inclined with respect to the engaging portion insertion direction (hereinafter also referred to as an offset direction) is applied to the tongue, the cross section of the engaging hole and the latch is rectangular. An asymmetrical load distribution (uneven load) occurs in the applied load. For this reason, the conventional seat belt locking device has a problem that the buckle is required to have strength against such a force in the offset direction. In particular, since the locking hole of the locking part is formed in a band plate shape, the tongue is difficult to turn in the offset direction of the force in the locked state of the tongue and the latch, so that the influence of the uneven load is increased.

The present invention has been made in view of such a problem, and the object thereof is to obtain a good feeling of inserting the locking portion even if the tongue is inserted into the buckle with the tongue inclined, and the buckle can be used against an offset load. It is an object of the present invention to provide a seat belt locking device capable of effectively obtaining strength and a seat belt device including the same.

In order to solve the above-described problems, in the seat belt locking device according to the present invention, the tongue supported by the seat belt has a gripping portion and a locking portion, and the locking portion guides the guide portion of the buckle. When the buckle is inserted into the buckle, the latch of the buckle enters the locking hole of the locking portion and locks to the inner peripheral surface of the locking hole, so that the tongue is locked to the latch. In the seat belt locking device, the locking portion interferes with the guide portion when the locking portion is tilted with respect to the locking portion insertion direction and inserted into the buckle. It is characterized by the provision of an escape portion that suppresses this.

Further, in the seat belt locking device according to the present invention, the locking hole of the locking portion has at least one corner facing the tip of the locking portion, and from the corner to the tip of the locking portion. It is characterized by being formed in a shape that widens toward the opposite side.

Furthermore, in the seat belt locking device according to the present invention, the corner is formed in an arc, and one end of the latch in the locking section insertion direction can be locked to the corner. It is characterized in that it is formed in an arc having the same diameter or substantially the same diameter as the arc of the part.

Further, in the seat belt locking device according to the present invention, the other end of the cross section of the latch in the locking portion insertion direction is formed in an arc, and the arc of the one end of the latch and the other end of the latch are The arc is formed by a concentric circle or a substantially concentric arc.

Furthermore, in the seat belt locking device according to the present invention, the buckle has a latch entry hole into which the latch can enter, and a plurality of fixtures that are fixed to a support bracket on the vehicle body side are penetrated. And a base having the same number of fastener through-holes sandwiching the latch entry hole, one end of the latch entry hole opposed to the other end of the latch is the same as or substantially the same as the diameter of the arc of the other end of the latch The center of the arc at one end of the latch entry hole and the centers of the plurality of fixture through holes are located on a straight line or substantially in a straight line.

Furthermore, the seat belt locking device according to the present invention includes: an ejector that causes the buckle to escape from the buckle when the latch is released from at least the latch and the tongue; and a holder that supports the latch and the ejector And further comprising.

Furthermore, the seat belt locking device according to the present invention includes a case in which the buckle covers at least the latch, the ejector, and the holder and has a locking portion insertion port, and the grip portion and the escape portion are provided. The side edge of the locking portion is formed in a circular arc, and the locking portion insertion port side end of the case is formed in a circular arc, and the latch and the latch are locked. And the center of the arc of the side edge of the locking part and the center of the arc of the locking part insertion port side end of the case coincide with each other or substantially coincide with each other. A gap is formed between the side edge of the stopper and the side of the case where the locking part is inserted.

On the other hand, a seatbelt device according to the present invention includes at least a seatbelt that restrains an occupant and a seatbelt locking device that locks the seatbelt on the vehicle body side. It is any one of the seat belt locking devices of the invention.

According to the seatbelt locking device of the present invention configured as described above, when the locking portion is inserted into the buckle at an angle with respect to the locking portion insertion direction, the locking portion is inserted into the locking portion of the tongue. Is provided with an escape portion that suppresses interference with the guide portion. As a result, when the locking portion is inserted into the buckle in a tilted state, the locking portion of the tongue is prevented from rotating by interfering with the guide portion by these relief portions, so the locking portion is tilted. It can be inserted into the buckle and locked. Therefore, even when the locking portion of the tongue is inserted into the buckle in a tilted state, the locking portion is prevented from interfering with the guide portion, and it is possible to suppress a sense of incongruity when inserting the locking portion held by the occupant. A good feeling when inserting can be obtained.

Also, the locking hole of the locking part that can be penetrated by the latch is formed in a divergent shape with one corner facing the tip of the locking part. Thereby, even if the tongue is inserted in a state inclined to the buckle and the locking hole is inclined, the latch can be stably penetrated. Therefore, the tongue can be stably and effectively locked to the latch.

Furthermore, when the tongue is latched with a force applied in a direction (offset direction) inclined with respect to the tongue engaging portion insertion direction, the tongue is rotated in the offset direction by the relief portion. It becomes possible to make it.

In that case, one end of the latch that the locking hole of the tongue locks is formed in a circular arc in cross section, and the corner that faces the tip of the locking portion that the latch locks has the same diameter as the arc of this end of the latch or It is formed in an arc of almost the same diameter. Thereby, at the time of latching of a tongue and a latch, the inner peripheral surface of the latching hole of a tongue and the outer peripheral surface of the one end of a latch can be closely or almost closely contacted by surface contact of an arc surface. When the force in the above-described offset direction is applied to the tongue in the locked state of the tongue and the latch due to the surface contact between the tongue and the arc of the latch, the force of the tongue is centered on the center of the arc at one end of the latch. It is possible to stably rotate in the offset direction.

In addition, by stably rotating the tongue in the force offset direction, the direction of the load applied to the latch by the tongue can be changed to the direction toward the center of the arc at one end of the latch. As a result, even if a force in the offset direction is applied to the tongue, the load due to this force from the tongue can be more effectively supported on the latch without being biased. Therefore, sufficient buckle strength against the offset force applied to the tongue can be obtained, and the buckle can be prevented from being enlarged.

Furthermore, since one end of the latch and the other end are formed by two concentric arcs having different diameters, each end of the latch can be processed without changing the position. Thereby, the process of a latch can be performed easily and with high precision.

Further, the force in the offset direction applied to the tongue in the latched state of the latch and the tongue is applied to the plurality of fixtures penetrating the plurality of fixture through holes provided across the latch entry holes, respectively. Are dispersed and supported. At this time, since the center of the arc at the other end of the latch through-hole and the center of the plurality of fixture through-holes are positioned on a straight line or substantially on a straight line, the distributed forces are made equal or nearly equal to each other. be able to. Thereby, it can suppress that the different load which is greatly different with respect to the force of the offset direction applied to a tongue is applied to a some fixing tool. Therefore, it is not necessary to set the strength of the plurality of fixtures higher than necessary, and the buckle can be reduced in size and weight.

Furthermore, at least the latch and the ejector are supported by the holder, and the load from the tongue is supported by the base via the latch. As a result, the holder that supports the latch and the ejector does not need to be configured as a strength member, and the holder can be configured of a light material such as resin. Therefore, unlike the conventional buckle, it is not necessary to support the latch and the ejector on the base, and it is not necessary to provide these support portions on the base. As a result, a base made of metal which is a strength member can be formed smaller than a base of a conventional buckle. This makes it possible to form the buckle even more lightweight and compact.

Furthermore, in the state where the tongue and the latch are locked, the center of the arc at one end of the latch, the center of the arc at both side edges of the locking part, and the center of the arc at the edge of the locking part insertion port side of the case Match or nearly match. Therefore, in a state where the tongue and the latch are locked, the gap between the locking portion and the buckle can be maintained at a constant or substantially constant size even if the tongue rotates. Thereby, it becomes possible to suppress an object from being caught between the locking portion of the tongue and the case of the buckle, and the tongue can be smoothly rotated.

Further, according to the seat belt device of the present invention, since the seat belt locking device of the present invention is provided, the locking portion of the tongue can be inserted into the buckle in a tilted state as described above. It is possible to obtain a good wearing operability of the belt.

These are figures which show typically an example of the seatbelt apparatus provided with an example of embodiment of the seatbelt latching apparatus which concerns on this invention. FIG. 2A is an exploded perspective view of a tongue and a buckle, and FIG. 2B is a plan view of a base of the buckle. FIG. 3 is a plan view of a tongue. These are the longitudinal cross-sectional views which follow the latching | locking part insertion direction of a buckle. (A) is a figure which shows the latching state of a latch and a tongue, FIG.5 (B) is a figure which shows the state which the tongue rotated with respect to the latch in FIG. 5 (A). These are the elements on larger scale of FIG. 5 (A). FIG. 7A is a view showing a state where the latch and the tongue are not locked, and FIG. 7B is a view showing a state where the latch and the tongue are locked. 7A is a cross-sectional view taken along the line VIIIA-VIIIA in FIG. 7A, and FIG. 8B is a cross-sectional view taken along the line VIIIB-VIIIB in FIG. These are figures which show the state which the tongue rotated from the state shown in FIG. These are the figures explaining insertion of the tongue of the tilted state to the buckle. These are the figures similar to FIG. 5 (A) which show the other example of embodiment of the seatbelt latching apparatus of this invention. FIG. 12 is a view similar to FIG. 5B of the example shown in FIG.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the following description, upper, lower, left, and right are the upper, lower, left, and right in the drawings.
FIG. 1 is a diagram schematically showing an example of a seat belt device provided with an example of an embodiment of a seat belt locking device according to the present invention.

As shown in FIG. 1, a seatbelt device 1 of this example includes a seatbelt retractor 3 disposed in the vicinity of a vehicle seat 2, a seat belt retractor 3 that is retractably wound and a belt anchor 4a at the front end is retracted. A seat belt 4 fixed to the floor of the vehicle body or the vehicle seat 2, a guide anchor 5 for guiding the seat belt 4 pulled out from the seat belt retractor 3 toward the shoulder of the occupant, and a seat belt guided from the guide anchor 5 4, a tongue 6 slidably supported by 4, a buckle 7 into which the tongue 6 is detachably inserted and locked, and a flat plate shape fixed to the floor of the vehicle body or the vehicle seat 2 and fixedly supported by the buckle 7. A support bracket 8 made of a metal plate is provided. In this case, the tongue 6 and the buckle 7 constitute a seat belt locking device of this example for locking the seat belt 4 to the vehicle body side.

2A is an exploded perspective view of the tongue and the buckle, FIG. 2B is a plan view of the base of the buckle, FIG. 3 is a plan view of the tongue, and FIG. 4 is a longitudinal sectional view along the direction in which the locking portion of the buckle is inserted. 5A is a view showing a latched state between the latch and the tongue, FIG. 5B is a view showing a state in which the tongue is rotated with respect to the latch in FIG. 5A, and FIG. It is the elements on larger scale of (A).

As shown in FIG. 2A and FIG. 3, the tongue 6 has a gripping portion 6a and a locking portion 6b that is long in a direction orthogonal to the gripping portion 6a (that is, the locking portion) as in the conventional tongue. The longitudinal direction of 6b is a direction orthogonal to the gripping part 6a). The locking portion 6b is made of a part of a metal tongue plate, and the gripping portion 6a is formed by resin-molding a portion of the tongue plate corresponding to the gripping portion 6a. The grip portion 6a is provided with a belt insertion hole 6c through which the seat belt 4 is inserted, and the locking portion 6b is provided with a locking hole 6d. Locking hole 6d is formed in equilateral triangle facing the one corner at the distal end of the locking portion 6b in plan view (vertex) 6d _1. Thus, the locking hole 6d has a flared shape towards the gripping part 6a of the corner 6d _1.

Further, each

corner

6d ₁ , 6d ₂ , 6d ₃ of this equilateral triangle is formed in an arc having a predetermined diameter. Furthermore, the locking portion 6b between the gripping portion 6a and the locking hole 6d is provided with

relief portions

6e and 6f each having a concave portion whose both side edges are constricted in a curved shape (for example, an arc shape). Furthermore, the profile in plan view of the profile 6g portions of the tongue plate engagement hole 6d is formed, the arc concentric outer shape corners 6d ₁ of the distal end portion and an arc of a larger diameter than the diameter of the circular arc The profile is formed by connecting the circular arc of the outer shape and the curved shape of the

relief portions

6e and 6f by their tangent lines or almost tangent lines.

Note that the locking hole 6d does not necessarily have an equilateral triangle shape, and may have various shapes such as an isosceles triangle and a rhombus, but at least one corner of the locking hole 6d is locked. orientation and the one corner at the distal end of the section 6b is, while being formed in the same arc as the corner portion 6d ₁ of this equilateral triangle is formed on the divergent shape toward the grip portion 6a of the one corner . As will be described later, in order that the tongue 6 and the buckle 7 can be stably locked when the tongue 6 is inserted into the buckle 7 at an angle, the locking hole 6d is preferably an equilateral triangle. Furthermore, the three

corners

6d ₁ , 6d ₂ , 6d ₃ can be formed with the same diameter or with different diameters. In the following description, it is assumed that the locking hole 6d is formed by an equilateral triangle in which the _three

corners

6d ₁ , 6d ₂ , 6d ₃ shown in FIG.

As shown in FIGS. 2A and 4, the buckle 7 includes a metal base 7a, a resin holder 7b, a metal inertia lever 7c, a metal latch 7d, a metal latch spring 7e, and a resin. Latch spring holder 7f, resin ejector 7g, metal ejector spring 7h, resin release button 7i, metal button spring 7j, resin upper cover 7k, resin lower cover 7m, and fixing It has a pair of metal rivets 7n, 7o as tools.

As shown in FIG. 2B and FIG. 4, the base 7a is a belt-like flat plate, and in the center of the width direction of the base 7a (direction perpendicular to the normal locking portion insertion direction α in Patent Document 1) An oval latch through hole 7a ₁ through which the latch 7d can pass is formed. (4, the left latch through hole 7a ₁₎ one end 7a ₂ of the engaging portion insertion side of the latch through hole 7a ₁ (4, the right end latch through hole 7a ₁₎ and the other end 7a ₃ are both It is formed in an arc with a predetermined diameter. Further, the base 7a rivet 7n, 7o is a pair of rivet insertion holes 7a _4, 7a ₅ to be inserted respectively are provided located on the left and right opposite sides of the latch through hole 7a _1.

In that case, as shown in FIG. 2B, FIG. 5A, and FIG. 6, a pair of a center 7a ₆ and a pair of arcs (more precisely, a circle forming the arc) of one end 7a ₂ of the latch through-hole 7a _1. The

centers

7a ₇ and 7a ₈ of the

rivet insertion holes

7a ₄ and 7a ₅ are located on one straight line β extending in a direction orthogonal to the engaging portion insertion direction α, or substantially on the straight line β. Is set.

The holder 7b is formed by resin molding, and a pair of

rivet insertion holes

7b ₁ and 7b ₂ through which the rivets 7n and 7o are inserted are formed in the holder 7b. These

rivet insertion holes

7b ₁ and 7b ₂ are formed so as to be aligned with the

rivet insertion holes

7a ₄ and 7a ₅ of the base 7a (the respective center positions are matched). Further, the holder 7b is provided with a pair of

rotation support portions

7b ₃ and 7b ₄ , a latch spring support portion 7b ₅ for supporting the latch spring 7e, and a button spring support portion 7b ₆ for supporting the button spring 7j. Further, as shown in FIGS. 2, 5A and 6, the holder 7b is provided with a pair of tongue

insertion guide portions

7b ₇ and 7b ₈ for guiding the locking portion 6b of the tongue 6. These tongue

insertion guide portions

7b ₇ and 7b ₈ have locking portion insertion direction guide surfaces 7b ₉ and 7b ₁₀ that guide the locking portion 6b in the locking portion insertion direction. Further, the tongue

insertion guide portions

7b ₇ and 7b ₈ are respectively connected to the engagement portion insertion direction guide surfaces 7b ₉ and 7b _{10 on} the engagement portion insertion side of the engagement portion insertion direction guide surfaces 7b ₉ and 7b _10. In addition to the inclined surfaces inclined, the locking portions 6b have locking portion inclined guide surfaces 7b ₁₁ and 7b ₁₂ for guiding the locking portion 6b toward the locking portion insertion direction guide surfaces 7b ₉ and 7b ₁₀ . Further, the tongue insertion guide portion 7b _7, 7b ₈ rivets 7n, 7o together are a pair of rivet insertion holes 7b _13, 7b ₁₄ to be inserted respectively formed, these rivet insertion holes 7b _13, 7b ₁₄ Are formed coaxially with the

rivet insertion holes

7b ₁ and 7b ₂ described above. It should be noted that the pair of tongue

insertion guide portions

7b ₇ and 7b ₈ can be provided on other components of the buckle 7 such as the upper cover 7k without being provided on the holder 7b. In the following description, the pair of tongue

insertion guide portions

7b ₇ and 7b ₈ will be described as being provided in the holder 7b.

The base 7a is fixedly supported on the support bracket 8 by a pair of rivets 7n, 7o, and the holder 7b is fixedly supported on the base 7a fixedly supported by the support bracket 8 by a pair of rivets 7n, 7o. In that case, the base 7a, the holder 7b and the support bracket 8, each of the pair of rivets 7n, rivet insertion holes 7b ₁ of 7o is

holder

7b, 7b _2, 7b _13, 7b _14, a pair of rivet insertion holes 7a of the

base

7a, ₄ , 7 a ₅ and a pair of

rivet insertion holes

8 a, 8 b of the support bracket 8 and rivet tightened together. Accordingly, only the holder 7b is attached to the base 7a, and the inertia lever 7c, the latch 7d, the ejector 7g, and the

springs

7e, 7h, 7j are not supported, so that they are supported like a conventionally known buckle. The base 7a is smaller and more compact than a conventional buckle base. In addition, since the base 7a is a strength member, it is formed of a metal having a relatively large weight. Therefore, the base 7a is formed in a small and compact size, so that the weight of the buckle 7 is effectively reduced. Further, since the inertia lever 7c, the latch 7d, the ejector 7g, and the

springs

7e, 7h, 7j are merely supported by the holder 7b, the holder 7b does not need to be formed of a strength member, and a lightweight material such as a resin. Can be formed. Thereby, the weight of the buckle 7 is further reduced effectively.

The inertia lever 7c is supported by the pair of rotation supported

portions

7b ₁ and 7b ₄ of the holder 7b so that the pair of rotation supported

portions

7c ₁ and 7c ₂ can swing. The inertia lever 7c is provided with a pair of

inertia masses

7c ₃ and 7c ₄ . Further, the inertia lever 7c is provided with a pair of release

button connecting portions

7c ₅ and 7c ₆ connected to the pair of inertia

lever connecting portions

7i ₁ and 7i ₂ of the release button 7i. Then, when the inertia force is applied to the release button 7i in the release direction of the lock when the latch 7d and the tongue 6 are locked, the inertia lever 7c swings when the release button 7i attempts to move inertia in the release direction. Thus, the inertial movement of the release button 7i in the release direction is prevented.

As shown in FIGS. 4 and 6, in the latch 7d, both ends 7d ₂ and 7d ₃ in the locking portion insertion direction α are formed in an arc shape on the outer peripheral surface of the cross section (surface perpendicular to the longitudinal direction of the latch 7d). Has been. In this case, the outer peripheral surfaces of the

ends

7d ₂ and 7d ₃ are formed by arcs of two concentric circles γ and δ (diameter of the circle γ> diameter of the circle δ) having different diameters as shown by a two-dot chain line in FIG. Yes. In addition, the diameter of the outer peripheral surface of the circular arc of each

end

7d ₂ and 7d ₃ may be the same.

Further, the arc of the end 7d ₃ on the engaging portion insertion side is an arc having the same or substantially the same diameter as the arc of the one end 7a ₂ of the latch through hole 7a ₁ . Therefore, when the tongue 6 is pulled through the seat belt 4 while the tongue 6 and the latch 7d are locked, the outer peripheral surface of the end 7d ₃ of the latch 7d and the inner peripheral surface of the one end 7a ₂ of the latch through-hole 7a ₁ And closely or almost closely. Moreover, (the side facing the end to the tongue 6) the lower end of the latch 7d is a partially inclined surface 7d _4. The inclined surface 7d ₄ is inclined upward as it proceeds in the locking portion insertion direction α.

The latch 7d is movably supported by the holder 7b. In that case, when the tongue 6 is not locked to the buckle 7 as shown in FIGS. 7A and 8A, the lower end of the latch 7d does not enter the locking hole 6d of the tongue 6. The non-actuated position is set so as not to be engaged with the tongue 6. 7B and 8B, in the state where the tongue 6 is locked to the buckle 7, the latch 7d moves downward and the lower end thereof engages with the locking hole 6d of the tongue 6. It is set to an operating position that penetrates and locks with the tongue 6. The latch 7d is constantly urged toward the operating position by a latch spring 7e that is contracted between a latch spring holder 7f provided at the upper end of the latch 7d and a latch spring support 7b ₅ of the holder 7b.

In a state where the latch 7d and tongue 6 in the operating position is locked, the center of the arc of the end 7d ₂ latch 7d is consistent or nearly consistent with the center of the arc of the corner portion 6d ₁ locking hole 6d of the tongue 6 Have been to. Accordingly, when the engagement between the tongue 6 and the latch 7d is an outer peripheral surface of the end 7d ₂ the inner peripheral surface and the latch 7d corner 6d ₁ locking hole 6d are in close contact or substantially close in surface contact arcuate surfaces.

In the example of this embodiment, the center of the arc of the end 7d ₂ and the center of the arc of the corner 6d ₁ of the locking hole 6d when the latch 7d and the tongue 6 are locked are the latches in the base 7a. The end 7a ₂ of the through hole 7a ₁ is made to coincide with or substantially coincide with the center 7a ₆ of the arc. Therefore, as described above, the end 7d ₂ and the end 7d ₃ of the latch 7d are formed by concentric circular arcs, so that the center of the arc of the end 7d ₃ of the latch 7d is also the end 7a ₂ of the latch through-hole 7a _1. It coincides with or substantially coincides with the center 7a _{6 of the} arc.

The ejector 7g has an unlocking position shown in FIG. 8A in which the latch 7d is released from the locking hole 6d of the tongue 6 and is not locked with the tongue 6, and the latch 7d enters the locking hole 6d of the tongue 6. The holder 7b is supported so as to be movable in the locking portion insertion direction α between the locking position shown in FIG. In that case, at the unlocking position of the ejector 7g, the ejector 7g supports the lower end of the latch 7d and holds the latch 7d in the inoperative position. The ejector 7g is constantly urged toward the unlocking position by an ejector spring 7h that is contracted between the right end thereof and the holder 7b.

Release button 7i is movably supported on the release button support portion 7k ₁ of the upper cover 7k the locking portion insertion direction alpha. Release button 7i Figure 8 by compressed state by the button spring 7j between the button spring supporting portion 7b ₆ of the holder 7b (A), and is always urged toward the inoperative position shown in (B). Then, in the locked state of the latch 7d and the tongue 6 shown in FIG. 8B, when the release button 7i is pressed and moved in the locking release direction (rightward in FIGS. 8A and 8B). The release button 7i first contacts the latch spring holder 7f to move the latch spring holder 7f upward in FIG. 8B against the urging force of the latch spring 7e, and then contacts the latch 7d to latch 7d. Is moved in the direction of the non-actuated position (upward in FIG. 8B; unlocking direction).

Upper cover 7k has a locking portion insertion opening 7k _2. The upper cover 7k and the lower cover 7m have a holder 7b attached to a base 7a fixed to the support bracket 8, and an inertia lever 7c, a latch 7d, an ejector 7g, and a release button 7i supported by the holder 7b. In the state, they are coupled to each other so as to cover them and partially sandwich the support bracket 8.

In the tongue 6 and the buckle 7 of this example configured as described above, the tongue 6 and the buckle 7 are separated from each other when the seat belt 4 is not attached. At this time, the buckle 7 is in an inoperative state shown in FIGS. 4 and 8A. To wear the seat belt 4, FIG. 7 (A) and FIG. 8 buckle locking hole 6d side of the locking portion 6b from the engaging portion insertion hole 7k ₂ of the buckle 7 of the tongue 6, as shown in (A) 7 Inserted inside. In that case, normally, as in the conventional tongue and buckle, as shown in FIG. 7A, the tongue 6 is inserted with the longitudinal direction of the locking portion 6b coinciding with or substantially coinciding with the locking portion insertion direction α. . At this time, when the center of the locking portion 6b is shifted from the engaging portion insertion direction guide surface 7b _9, 7b ₁₀ is engaging portion 6b is in one of the locking portion inclined guide surface 7b _11, 7b ₁₂ The guide is smoothly inserted into the buckle 7.

And the front-end | tip (right end) of the tongue plate 6 contact | abuts to the ejector 7g, and presses this ejector 7g. Thereby, the ejector 7g moves to the right against the urging force of the ejector spring 7h as the tongue 6 is inserted. When the latching hole 6d of the tongue 6 moves until there is a space in which the latch 7d can move in the latching direction with the tongue 6 (downward in FIGS. 8A and 8B), the latch 7d is latched. The urging force of the spring 7e moves into the locking hole 6d of the tongue 6 in a non-contact manner with the tongue 6 to reach the operating position. Thereafter, when the gripping of the tongue 6 is released, the ejector 7g presses the tongue 6 to the left by the urging force of the ejector spring 7h, so that the corner 6d ₁ of the locking hole 6d is shown in FIG. 8B. and inner and outer circumferential surfaces of the end 7d ₂ latch 7d is closely or nearly intimate in surface contact arcuate surfaces, the tongue 6 and the latch 7d (that is, the buckle 7) and are engaged with each other.

From the locked state of the tongue 6 and the latch 7d shown in FIGS. 7B and 8B, the release button 7i is pushed rightward to release these locks. Then, as described above, the release button 7i first moves the latch spring holder 7f upward in FIG. 8B, and then moves the latch 7d also upward (that is, in the non-operating position; locking release direction). . Then, the inclined surface 7d ₄ of the latch 7d becomes a point that comes out of the locking hole 6d of the tongue 6. At this time, a gap is generated between the latch spring holder 7f and the latch 7d, and the urging force of the latch spring 7e is not applied to the latch 7d. Then, the ejector 7g abuts against the inclined surfaces 7d ₄ of the latch 7d by the biasing force of the ejector spring 7h, flipping the latch 7d to the point that leaves the locking hole 6d (unlocking completion point). At this time, since the latch 7d is in a state where the urging force of the latch spring 7e is not acting, the latch 7d is flipped up relatively easily. Then, the ejector 7g ejects the tongue 6 from the buckle 7 by the urging force of the ejector spring 7h and enters under the latch 7d. Finally, when the push-in of the release button 7i is released, the release button 7i returns to the inoperative position shown in FIGS. 8A and 8B by the urging force of the button spring 7j, and by the urging force of the latch spring 7e. The latch spring holder 7f moves downward and contacts the latch 7d, and the latch 7d moves downward together with the latch spring holder 7f and rests on the ejector 7g. In this way, the tongue 6 is dissociated from the buckle 7.

By the way, the tongue 6 of this example is provided with

relief portions

6e and 6f made of curved concave portions on both side edges of the locking portion 6b as described above. As a result, it is possible to rotate a predetermined angle while the latch 7d and the tongue 6 are locked. For example, as shown in FIG. 5B, in a state where the latch 7d and the tongue 6 are locked, the tongue 6 is inclined at a predetermined angle with the locking portion insertion direction α (in the illustrated example, with respect to the locking portion insertion direction α). When it is pulled with the pulling force F in the diagonally left direction), the tongue 6 rotates in the same direction. At this time, the locking portion 6b is to interfere with the tongue insertion guide portion 7b ₈ is suppressed by the relief portion 6f as clearly shown in FIG. In this way, by providing the

relief portions

6e and 6f made of curved concave portions on both side edges of the locking portion 6b, the tongue 6 and the locking portion insertion direction α in the locked state of the tongue 6 and the buckle 7 can be obtained. When the pulling force F in the inclined direction is applied, the tongue 6 is stably and effectively rotated at a relatively large angle. The same applies when the tongue 6 is pulled with a pulling force F diagonally rightward with respect to the locking portion insertion direction α.

Further, when the tongue 6 is rotated, the close contact state between the inner peripheral surface of the corner 6d ₁ of the locking hole 6d and the outer peripheral surface of the end 7d ₂ of the latch 7d is maintained, so that the tongue 6 has the end 7d of the latch 7d. _It rotates about the center of the _second arc (that is, substantially the center of the arc of the corner 6d ₁ ). At this time, the locking portion 6b of the tip portion from that arc contour 6g is an arc concentric with the corner portion 6d ₁ of the tongue 6, the locking portion 6b when the rotation of the tongue 6 pair of tongue

insertion guide portion

7b ₇ and 7b ₈ are prevented from interfering with each other, so that the tongue 6 can be rotated more stably.

Further, as shown in FIG. 9, when the tongue 6 is pulled by the pulling force F in the direction inclined at a predetermined angle with the locking portion insertion direction α in the locked state of the latch 7d and the tongue 6, the tongue 6 pulls the latch 7d. Press with force F '. This force F ′ is directed to the center 7a ₆ as a whole in the same direction as the pulling force F. The force F ', end 7d ₃ latch 7d is close to one end 7a ₂ of the latch holes 7a _1, the same force F is applied via the latch 7d based 7a. For this reason, forces F ₁ and F ₂ in which the pulling force F is dispersed from the base 7a are applied to the pair of rivets 7n and 7o, respectively (F = F ′ = F ₁ + F ₂ ). At this time, the arc center 7a ₆ of the one end 7a ₂ of the latch through hole 7a ₁ and the

centers

7a ₇ and 7a _{8 of the} pair of

rivet insertion holes

7a ₄ and 7a ₅ are positioned on the straight line β or substantially on the straight line β. ing. As a result, the forces F ₁ and F ₂ applied to the pair of

rivet insertion holes

7a ₄ and 7a ₅ are equal or nearly equal to each other (F ₁ = F ₂ or F ₁ ≈F ₂ ).

Furthermore, the tongue 6 and the buckle 7 of this example are different from the conventional tongue and buckle, even if the longitudinal direction of the locking portion 6b is inclined at a predetermined angle with respect to the locking portion insertion direction α, Can be inserted. That is, the occupant as shown in FIG. 10, the locking portion 6b is the longitudinal direction is inserted locking part of the buckle 7 in the insertion port 7k ₂ in a state in which a predetermined angle inclined relative to the locking portion insertion direction alpha. At this time, since the locking portion 6b has a relief portion 6f, the locking portion 6b is not interfere with the tongue insertion guide portion 7b ₈ of the holder 7b, the buckle 7 in a state where the tongue 6 is inclined Enter smoothly.

When the locking hole 6d of the tongue 6 comes to a position facing the latch 7d as described above, the latch 7d enters the locking hole 6d, and the tongue 6 and the latch 7d are locked. In that case, when the tongue 6 is inserted into the buckle 7 in a tilted state, the locking hole 6d is also tilted. However, the locking hole 6d is because it is formed into an equilateral triangle or substantially an equilateral triangle, and is formed in a divergent shape spreading toward the corner portion 6d ₁ of the tip side of the grip portion 6a side. In this case, the locking hole 6d having a diverging shape is inserted without interfering with the tongue

insertion guide portions

7b ₇ and 7b ₈ of the buckle 7 when the locking portion 6b of the tongue 6 is inserted into the buckle 7. The latch 7d enters the locking hole 6d in a state inclined to the maximum possible angle, and is configured to be locked with the tongue 6. Therefore, even if the locking hole 6d is also inclined, the latch 7d enters the locking hole 6d stably and smoothly.

In addition, the corner 6d ₁ of the locking hole 6d of the tongue 6 and the end 7d _{2 of the} latch 7d are formed in an arc having the same or substantially the same diameter, so that the tongue 6 is inserted into the buckle 7 in an inclined state. by inner and outer circumferential surfaces of the end 7d ₂ latch 7d locking holes 6d of the tongue 6 is in intimate or nearly intimate in surface contact arcuate surfaces also. As a result, even when the occupant tries to lock the tongue 6 with the buckle 7 in a state where the tongue 6 is inclined as described above, the tongue 6 and the buckle 7 are stably locked. The same applies to the case where the locking portion 6b is inserted into the buckle 7 with the tongue 6 tilted in the direction opposite to the direction shown in FIG.

According to the seat belt locking device of this example configured as described above, the locking portions 6b of the tongue 6 are disposed on both side edges of the locking portions 6b between the gripping portion 6a and the locking holes 6d as described above. When inserted into the buckle 7 in a tilted state, the escape portion 6e is formed from a concave portion constricted in a curved shape and prevents the locking portion 6b from interfering with the tongue

insertion guide portions

7b ₇ and 7b ₈ of the buckle 7. , 6f. Accordingly, when the locking portion 6b is inserted into the buckle 7 in an inclined state, the locking portion 6b of the tongue 6 interferes with the tongue

insertion guide portions

7b ₇ and 7b ₈ by these

relief portions

6e and 6f and rotates. Therefore, the locking portion 6b can be inserted into the buckle 7 in a tilted state and locked. Therefore, even if the locking portion 6b of the tongue 6 is inserted into the buckle 7 in an inclined state, it is possible to suppress a sense of incongruity when the occupant is inserted and to obtain a good feeling when the tongue 6 is inserted. it can.

Further, the locking hole 6d of the locking portion 6b through which the latch 7d can pass is formed in an equilateral triangle with _one corner 6d1 facing the tip of the locking portion 6b. Therefore, it is possible to form widened toward the end toward the locking hole 6d from the corner 6d ₁ to the grip portion 6a. Thereby, even if the tongue 6 is inserted into the buckle 7 in a tilted state and the locking hole 6d is tilted, the latch 7d can be stably penetrated. Therefore, the tongue 6 can be more securely and effectively locked to the latch 7d.

Furthermore, when the aforementioned force in the offset direction is applied to the tongue 6 while the tongue 6 and the latch 7d are locked, the tongue 6 can be rotated in this offset direction by the

relief portions

6e and 6f.

Furthermore, with the locking hole 6d of the tongue 6 is formed in a circular arc end 7d ₂ latches 7d for engaging in cross section, an end corner portion 6d ₁ which faces the end of the engagement portion 6b latch 7d is engaged 7d ₂ arcs and same diameter or substantially forms an arc of the same diameter. Thus, when locking of the tongue 6 and the latch 7d, it is possible to close or to substantially close the outer peripheral surface of the end 7d ₂ the inner peripheral surface and the latch 7d locking hole 6d of the tongue 6 in surface contact with the circular arc surface . When the force in the above-described offset direction is applied to the tongue 6 in the locked state of the tongue 6 and the latch 7d by the surface contact of the arc surfaces of the tongue 6 and the latch 7d, the tongue 6 is connected to the end 7d _{2 of the} latch 7d. It is possible to stably rotate in the force offset direction around the center of the arc. In particular, the profile of the contour 6g of the locking portion 6b locking hole 6d is formed, the outer shape of the distal end portion of the locking portion 6b is corners 6d ₁ arcs and concentric with and of larger diameter than the diameter of the circular arc arc And a profile obtained by connecting the circular arc of the outer shape and the curved shape of the

relief portions

6e and 6f by their tangent lines or almost tangent lines. As a result, the tongue 6 can be rotated more stably without causing the tongue 6 to interfere with the

guide portions

7d ₇ and 7d ₈ .

Furthermore, by stably rotating the tongue 6 in the offset direction of the force can be tongue 6 is in the direction toward the arc center of the end 7d ₂ the direction of the load applied to the latch 7d. Thereby, even if the force F in the offset direction is applied to the tongue 6, the load due to the force F from the tongue 6 can be more effectively supported without being biased to the latch 7 d. Therefore, sufficient strength of the buckle 7 with respect to the force F in the offset direction applied to the tongue 6 can be obtained, and an increase in size of the buckle 7 can be suppressed.

Further, each end 7d _2, 7d ₃ latch 7d, since the form an arc of two concentric circles different diameters, be processed without changing the position of each end 7d _2, 7d ₃ latch 7d It becomes possible. Thereby, the processing of the latch 7d can be easily performed with high accuracy.

Further, the force F in the offset direction applied to the tongue 6 when the latch 7d and the tongue 6 are locked is distributed to the pair of rivets 7n and 7o as forces F ₁ and F ₂ via the latch 7d and the base 7a, respectively. To support. At this time, the arc center 7a ₆ of the one end 7a ₂ of the latch through hole 7a ₁ and the

centers

7a ₇ and 7a _{8 of the} pair of

rivet insertion holes

7a ₄ and 7a ₅ are positioned on the straight line β or substantially on the straight line β. Thus, the distributed forces F ₁ and F ₂ can be equal or nearly equal to each other. Thereby, it is possible to suppress the application of a greatly different offset load to the pair of rivets 7n and 7o with respect to the force F in the offset direction applied to the tongue 6. Therefore, the strength of the pair of rivets 7n and 7o need not be set larger than necessary, and the buckle 7 can be reduced in size and weight.

Furthermore, the inertia lever 7c, the latch 7d, and the ejector 7g are supported by the resin holder 7b, and the load from the tongue 6 is supported by the metal base 7a via the latch 7d. Unlike the buckle, it is not necessary to support the inertia lever 7c, the latch 7d, and the ejector 7g on the base 7a, and it is not necessary to provide a support portion for them. Therefore, the base 7a can be formed smaller than the base of the conventional buckle. As a result, the buckle 7 can be formed even more lightweight and compact.

On the other hand, according to the seat belt device 1 of this example, since the seat belt locking device of this example is provided, as described above, the locking portion 6b of the tongue 6 can be inserted into the buckle 7 in an inclined state. Therefore, it is possible to obtain a good wearing operability of the seat belt 4.

FIG. 11 is a view similar to FIG. 5 (A) showing another example of the seat belt locking device of the present invention, and FIG. 12 is the same as FIG. 5 (B) in the example shown in FIG. FIG.
In the example of the above-described embodiment, as shown in FIG. 5A, locking from the

relief portions

6e and 6f of the locking portion 6b to the portion corresponding to the grip of the tongue plate (that is, the portion molded with resin). Both

side edges

6h and 6i of the part 6b are formed in a straight line inclined so as to be away from the buckle 7 from the center of the locking part 6b toward both side edges. Therefore, between the edge 7p engagement portion insertion opening 7k ₂ side in the side edges 6h, upper case 7k of 6i and buckle 7 of the locking portion 6b is in a state in which the tongue 6 and the buckle 7 is engaged, comparison Large gaps ε and ζ are formed. When the tongue 6 is rotated by the above-described force F from the state shown in FIG. 5A as shown in FIG. 5B, one gap ε increases and the other gap ζ decreases. That is, the sizes of the gaps ε and ζ are changed by the rotation of the tongue 6. At this time, there is a possibility that an object may be caught between the engaging portion 6b of the tongue 6 and the upper case 7k and the lower case 7m of the buckle 7 on the side of the gap ζ that changes slightly.

Therefore, as shown in FIG. 11, in the example of this embodiment, both

side edges

6h and 6i of the locking portion 6b of the tongue 6 are formed in an arc. In that case, these side edges 6h, the center of the arc of 6i, the locking of the center and the tongue 6 of the arc end 7d ₂ latch 7d when the latch 7d and tongue 6 in the operating position is locked there is a corner arc of the center of 6d ₁ hole 6d match or be substantially coincident.

Moreover, the edge 7p of the upper case 7k of the buckle 7 is also formed in the circular arc. In that case, the arc of the side edge 7p center, the center and the locking hole 6d of the tongue 6 of the arc end 7d ₂ latch 7d when the latch 7d and tongue 6 in the operating position is locked The center of the arc of the corner 6d ₁ is made to coincide with or substantially coincide with the center of the arc. That is, in a state in which the tongue 6 and the latch 7d is engaged, and the center of the arc of the end 7d ₂ latches 7d, the side edges 6h, the center of the arc of 6i of the locking portion 6b, the insertion engaging portion of the upper case 7k and the center of the arc of the mouth 7k ₂ side edges 7p is coincident or as nearly coincident.

Therefore, in the state shown in FIG. 11 in which the tongue 6 and the latch 7d are locked, the gaps ε and ζ between the locking portion 6b and the buckle 7 are relatively small and have a constant or substantially constant size. In addition, when the tongue 6 is applied with the force F from the state shown in FIG. 11 as shown in FIG. 12, the tongue 6 is in contact with the inner peripheral surface of the corner 6d ₁ of the locking hole 6d as in the above example. while maintaining contact with the outer peripheral surface of the end 7d ₂ latch 7d rotates. Accordingly, both

side edges

6h, 6i of the locking part 6b also rotate, but the gaps ε, ζ between the

side edges

6h, 6i of the locking part 6b and the end edge 7p of the buckle 7 are kept constant or substantially constant. And hardly change. As described above, in this example, the gap between the side edges 6h and 6i of the locking portion 6b and the end edge 7p of the buckle 7 even when the tongue 6 rotates in the locked state of the tongue 6 and the latch 7d. Since ε and ζ can be held constant or substantially constant, it is possible to prevent objects from being caught between the locking portion 6b of the tongue 6 and the upper case 7k and the lower case 7m of the buckle 7. In addition, the tongue 6 can be smoothly rotated.
Other configurations and other functions and effects of the seat belt locking device and the seat belt device 1 of this example are the same as those of the above-described example.

The present invention is not limited to the above-described examples, and various design changes can be made within the scope of the matters described in the claims.

The seat belt locking device of the present invention can be suitably used for a seat belt locking device used in a seat belt device installed in a seat of a transportation facility such as an automobile, and the seat belt device of the present invention includes: The present invention can be suitably used in the seat belt device installed in the above-mentioned transportation seat.

Claims

A tongue supported by a seat belt has a gripping portion and a locking portion, and when the locking portion is guided by a guide portion of a buckle and inserted into the buckle, the latch of the buckle is In the seat belt locking device in which the tongue is locked to the latch by entering the locking hole and locking to the inner peripheral surface of the locking hole,
The locking portion of the tongue is provided with a relief portion that prevents the locking portion from interfering with the guide portion when the locking portion is inclined with respect to the locking portion insertion direction and inserted into the buckle. A seat belt locking device characterized in that the seat belt locking device is provided.
The locking hole of the locking portion has at least one corner facing the tip of the locking portion, and is formed in a shape that widens from the corner toward the opposite side to the tip of the locking portion. The seat belt locking device according to claim 1, wherein the seat belt locking device is provided.
The corner is formed in an arc,
One end of the cross section of the latch in the engaging portion insertion direction can be engaged with the corner portion, and is formed in an arc having the same diameter or substantially the same diameter as the arc of the corner portion. The seat belt locking device according to claim 2.
The other end of the cross section of the latch in the direction in which the engaging portion is inserted is formed in an arc, and the arc at the one end of the latch and the arc at the other end of the latch are formed by concentric or substantially concentric arcs. The seat belt locking device according to claim 2, wherein the seat belt locking device is provided.
The buckle has a latch entry hole into which the latch can enter, and has the same number of fixture through holes as the fixture through which a plurality of fixtures to be fixed to the support bracket on the vehicle body are passed. With a sandwiched base,
One end of the latch entry hole facing the other end of the latch is formed in an arc having the same or substantially the same diameter as the arc of the other end of the latch,
The seatbelt locking device according to claim 4, wherein a center of an arc at one end of the latch entry hole and a center of the plurality of fixture through holes are located on a straight line or substantially on a straight line.
The said buckle is further equipped with the ejector which makes the said tongue escape from the said buckle at the time of the latch release of the said latch and the said tongue, the said latch, and the holder which supports the said ejector. The seat belt locking device according to the description.
The buckle includes a case that covers at least the latch, the ejector, and the holder and has an engaging portion insertion port;
The side edge of the locking part between the grip part and the escape part is formed in an arc, and the locking part insertion port side end of the case is formed in an arc.
With the tongue and the latch locked, the center of the arc at one end of the latch, the center of the arc at the side edge of the locking portion, and the center of the arc at the locking portion insertion port side end of the case 7 is configured to match or substantially match, and a gap is formed between a side edge of the locking portion and a locking portion insertion port side end of the case. Seat belt locking device.
A seat belt to restrain the occupant;
A seat belt locking device for locking the seat belt to the vehicle body side;
Comprising at least
The seat belt device according to any one of claims 1 to 7, wherein the seat belt device is a seat belt device.