JP6262588B2 - Seat belt fixing device - Google Patents

Description

  The present invention relates to a fixing device used for suppressing looseness of a seat belt, and relates to a seat belt fixing device used when, for example, a child seat is fixed to a vehicle-side seat.

  The child seat is fixed to the vehicle side seat by locking the pulled-out seat belt with a buckle and passing the seat belt through a routing route determined for each child seat. At this time, the seat belt can be prevented from being loosened or displaced by using a one-way lock function that works by pulling out the seat belt once. In other words, the seat belt pulled out at one end has a pulling action to the retractor disposed on the shoulder opening side, but a lock works on the drawer side, and the tightened seat belt does not loosen. It is.

  When the child seat is fixed using such a function, the child seat hits the shoulder strap folded from the buckle (specifically, the tongue plate engaged with the buckle) while the child seat is pressed against the vehicle-side seat. This is done by tightening a part (hereinafter referred to as a shoulder belt). The child seat fixing effect by the seat belt is improved by the bending of the seat belt caused by the tightening being drawn into the retractor.

  Here, a seat belt fixing device is used in order to draw in the retractor of the seat belt caused by tightening to the retractor. The seat belt fixing device sandwiches the shoulder belt and demonstrates the one-way lock function, so that the seat belt flexion that occurs when the seat is tightened is pulled back in the loose direction, that is, the part that corresponds to the waist strap (hereinafter referred to as the waist belt). To prevent it. As a result, the deflection generated in the seat belt is preferably drawn into the retractor, and the child seat is more firmly fixed.

  As the seat belt fixing device, as disclosed in Patent Documents 1 and 2, as a configuration for exhibiting a one-way lock function, there are those that employ a slide cam and those that employ a rotating cam. Are known.

Japanese Patent Laid-Open No. 11-11193 JP 2002-120617 A

  Both of the seat belt fixing devices disclosed in Patent Documents 1 and 2 use the friction between the seat belt and the cam to exhibit a one-way lock function. The seat belt fixing device disclosed in Patent Document 1 includes a spring that generates a force that presses the cam against the seat belt in order to increase the fixing force of the seat belt and increase the effectiveness of the one-way lock. Yes. For this reason, when the seat belt fixing device disclosed in Patent Document 1 is used, a load is applied even when the seat belt is pulled in a direction in which the seat belt is not locked, that is, a direction in which the seat belt is tightened. Will increase.

  On the other hand, in the seat belt fixing device disclosed in Patent Document 2, the rotating cam is rotatably arranged. Then, when the seat belt tries to move in the one-way lock direction, the rotation cam is rotated using the friction of the seat belt, and the lock function is generated by sandwiching the seat belt between the rotation cam and the wall surface. . For this reason, especially in the initial rotation start state of the rotating cam, the friction with the seat belt is low, and the one-way lock may not be effective against sudden pulling or strong pulling.

  Therefore, in the present invention, when the one-way lock mechanism is not working, the seat belt can be pulled smoothly, and the seat belt can be securely and firmly fixed against withdrawal in the locking direction. An object is to provide a belt fixing device.

  In order to achieve the above object, a seatbelt fixing device according to the present invention includes a base member having an inclined surface along a belt-passing direction, a cover member having a restraining surface disposed to face the inclined surface, and the inclined surface. And a cam member having a slide surface that is disposed between the holding surface and a sliding surface that slides relative to the inclined surface, and a lock surface that includes a wedge portion that sandwiches a seat belt between the holding surface and the holding surface. And the inclined surface is configured to be closer to the restraining surface toward the side opposite to the retractor arrangement side on which the seat belt is wound, and the slide surface includes a stable surface and a swing surface. And an angle is formed so that an angle formed by the stable surface and the rocking surface is an obtuse angle.

  Further, in the seat belt fixing device having the above-described characteristics, the cover member is in a direction intersecting the belt passing direction, from the restraining surface to the inclined surface, on the entrance side and the exit side of the seat belt. The cam member is disposed such that the wedge portion is positioned between the pair of convex portions in a state where the inclined surface and the restraining surface face each other, and The wedge portion may have a height that intersects with a straight line connecting the tips of the convex portions forming a pair.

  With such a configuration, the wedge portion of the cam member is always in contact with the seat belt. For this reason, when the seat belt is moved, the reaction speed until the cam member is actuated can be increased. Moreover, since the seat belt is always in contact with the wedge portion, the cam member can be operated reliably.

  Further, in the seat belt fixing device having the above-described features, the inclined surface may be configured to increase the inclination angle toward the side opposite to the retractor arrangement side.

  By setting it as such a structure, the force which pinches | interposes a seatbelt can be raised in steps. For this reason, when the force (frictional force) by which the cam member is dragged by the seat belt is weak, slipping between the seat belt and the cam member can be suppressed by sandwiching the seat belt with a small force. On the other hand, after the seat belt is sandwiched between the restraining surface and the wedge portion and the frictional force between the seat belt and the cam member is increased, the force pressing the seat belt against the restraining surface can be increased.

  In the seat belt fixing device having the above-described characteristics, the base member may be provided with a positioning spring that biases the cam member toward the retractor arrangement side.

  By adopting such a configuration, even when the seat belt fixing device is turned sideways, that is, when the belt passing direction is set to the vertical direction, the cam member does not fall in the direction opposite to the retractor arrangement side. Therefore, it is possible to prevent a situation in which the cam member is sandwiched between the inclined surface and the holding surface and the cover member cannot be closed with respect to the base member.

  Further, in the seat belt fixing device having the above-described features, the restraining surface may be constituted by an uneven surface.

  According to such a configuration, when the seat belt is pressed against the restraining surface, an area in contact with the belt surface is reduced. For this reason, the stress applied to the contact surface can be increased. Therefore, the force for fixing the seat belt can be increased as compared with the case where the holding surface is a flat surface.

  Furthermore, in the seatbelt fixing device having the above-described features, the inclined surface is configured by a plurality of convex portions arranged along a direction intersecting the belt passing direction and extending in the belt passing direction. Is desirable.

  According to such a configuration, the area of the surface that contacts when the cam member slides is reduced. Therefore, the frictional force at the time of sliding can be reduced, and the cam member can be operated smoothly.

  According to the seat belt fixing device having the above-described characteristics, when the one-way lock mechanism is not working, the seat belt can be pulled smoothly. On the other hand, when the seat belt receives a force to be pulled back in the lock direction, the seat belt can be securely and firmly fixed.

In the seatbelt fixing device which concerns on embodiment, it is a perspective view which shows the form at the time of closing a cover member. In the seatbelt fixing device which concerns on embodiment, it is a perspective view which shows the form at the time of expanding a cover member. It is a figure which shows the front structure of a base member. It is a figure which shows the planar structure of a base member. It is a figure which shows the structure of the AA cross section in FIG. It is a figure which shows the front structure of a cover member. It is a figure which shows the planar structure of a cover member. It is a figure which shows the bottom face structure of a cover member. It is a figure which shows the BB cross section in FIG. It is a figure which shows CC cross section in FIG. It is a figure which shows the front structure of a cam member. It is a figure which shows the planar structure of a cam member. It is a figure which shows the structure of the right side surface of a cam member. It is a perspective view which shows an example of a structure of the child seat which attaches the seatbelt fixing device which concerns on embodiment. It is a figure for demonstrating operation | movement of a seatbelt fixing device, and is a figure which shows the state which has pulled the seatbelt in the slidable direction. It is a figure for demonstrating operation | movement of a seatbelt fixing device, and is a figure which shows the state which started pulling the seatbelt in the locking direction. It is a figure for demonstrating operation | movement of a seatbelt fixing apparatus, and is a figure which shows the state in which the seatbelt is locked.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment according to a seat belt fixing device of the present invention will be described in detail with reference to the drawings.

  First, a schematic configuration of a child seat to which the seatbelt fixing device according to the embodiment is applied will be described with reference to FIG. The child seat 50 includes a base 52 and a seat 54. The child seat 50 is routed through a tongue plate 58 engaged with the buckle 56 along a routing route provided on the base 52 and the seat 54, respectively, as a portion functioning as a waist belt 64 and a portion functioning as a shoulder belt 62. The shoulder belt 62 is pulled into a retractor (not shown) and fixed by the one-way lock mechanism working.

  The seat belt fixing device 10 according to the embodiment is used so as to sandwich the seat belt 60 located on the retractor side of the tongue plate 58, that is, the shoulder belt 62. For this reason, in the example shown in FIG. 14, the seat belt fixing device 10 is arranged at a position subsequent to the routing path of the waist belt 64 in the base 52 and positioned in the routing path immediately after being routed to the tongue plate 58. Yes.

  The seat belt fixing device 10 according to the present embodiment is configured based on a base member 12, a cover member 24, and a cam member 34 as shown in perspective views in FIGS. The base member 12 is a member that is fixed to the base 52 that constitutes the child seat 50, and has the inclined surface 14 on the surface side through which the seat belt 60 is passed. As shown in detail in FIGS. 3 to 5, the inclined surface 14 is provided along the belt passing direction so as to form an uphill toward the opposite side to the direction in which the seat belt 60 is retracted (retractor arrangement direction). It is configured. 3 is a front view of the base member, FIG. 4 is a plan view, and FIG. 5 is a cross-sectional view taken along line AA in FIG.

  Here, the inclined surface 14 of the base member 12 according to the present embodiment is configured such that the inclination angle increases stepwise. With such a configuration, the tightening strength of the seat belt 60 by the cam member 34, which will be described in detail later, can be increased stepwise.

  In addition, the inclined surface 14 may be formed by inclining the entire belt passing surface, but in the present embodiment, the inclined surface 14 is configured by a plurality of convex portions 14a. With such a configuration, it is possible to reduce the frictional force when the cam member 34, which will be described in detail later, slides on the inclined surface 14.

  The inclined surface 14 is provided with a guide groove 16 along the belt passing direction. The guide groove 16 is a groove for interposing a guide portion 40 provided in the cam member 34, which will be described in detail later, and is a cam member with respect to the width of the inclined surface 14 (the length in the direction along the belt passing direction). It is provided with a length of 34 sliding ranges. A positioning spring 18 is disposed on the lower side of the guide groove 16. The positioning spring 18 is configured to generate a biasing force toward the retractor arrangement side in the belt passing direction.

  In addition, an engagement portion 20 with a cover member 24, which will be described in detail later, is provided at one end of the width direction of the belt passing surface constituting the inclined surface 14 (direction perpendicular to the direction in which the seat belt 60 passes). On the other hand, an engaging portion 22 with a lock member 42, which will be described in detail later, is provided. The engaging portion 20 with the cover member 24 is configured to have a through-hole 20a that can be pin-coupled so that the cover member 24 is rotatably engaged with the base member 12. The engaging portion 22 with the lock member 42 is provided with a protrusion for hooking the lock member 42.

  Note that the base member 12 according to the embodiment is formed with an engagement hole 12a for fixing the child seat 50 to the base 52.

  Next, details of the cover member 24 will be described with reference to FIGS. 6 to 10. 6 is a front view of the cover member, FIG. 7 is a plan view, and FIG. 8 is a bottom view. 9 is a diagram showing a BB section in FIG. 7, and FIG. 10 is a diagram showing a CC section in FIG.

  The cover member 24 is a member having a holding surface 26 on the belt passing surface facing the inclined surface 14 in the base member 12 described above. The restraining surface 26 is formed with an uneven surface on which the seat belt 60 is pressed. In the cover member 24 according to the embodiment, the plate material is arranged in a lattice shape to form a so-called grating structure, so that unevenness is formed on the restraining surface 26. With such a configuration, when the seat belt 60 is pressed, stress concentrates on the contact portion with the holding surface 26. For this reason, compared with the case where the restraining surface 26 is a flat surface, the wedge effect of sandwiching the seat belt 60, that is, the locking force can be enhanced.

  When the restraint surface 26 is in a state of facing the inclined surface 14 on the entrance side and the exit side of the seat belt 60 on the restraint surface 26 (for example, the retractor arrangement side is set as the exit side), the seat surface 60 faces the inclined surface 14 side. Protruding convex portions 28a and 28b are provided. By providing the convex portions 28a and 28b, it is possible to form a suitable gap between the inclined surface 14 and a cam member 34, which will be described in detail later. Further, by adjusting the height of the convex portions 28a and 28b and the height of the cam member 34, the path through which the seat belt 60 passes can be bent, and the function of the cam member 34 can be easily exhibited.

  The engagement portion 30 with the base member 12 described above is provided at one of the end portions of the holding surface 26 in the width direction (direction perpendicular to the direction in which the belt passes), and the engagement portion 30 with the lock member 42 is provided at the other end. A joint portion 32 is provided. The engaging portion 30 with the base member 12 has a through hole 30a that can be pin-coupled. Further, the engaging portion 32 with the lock member 42 is a part for engaging the lock member 42 with the cover member 24 so as to be rotatable. In addition, the form of the engaging part 32 does not ask | require the specific structure, if the effect | action of this invention can be exhibited effectively.

  The cover member 24 is locked with respect to the base member 12 so that the seat belt 60 is sandwiched between the cover member 24 and the cam member 34 described later in detail. For this reason, when the cover member 24 is bent at the time of locking, the pinching of the seat belt 60 is loosened. Therefore, in the cover member 24 according to the embodiment, the strength against bending is improved by configuring the cover member 24 so that the thickness of the central portion in the belt passing direction is increased (see FIG. 10).

  The cam member 34 is a member that is disposed between the inclined surface 14 of the base member 12 and the restraining surface of the cover member 24 and plays a role of pressing the seat belt 60 that is passed between the two to the restraining surface. The cam member 34 according to the present embodiment is configured based on a slide surface 36 and a lock surface 38. With such a configuration, the cam member 34 has a function as a slide cam.

  The slide surface 36 is a surface that plays a role of sliding with respect to the inclined surface 14. The slide surface 36 has a stable surface 36a and a swing surface 36b. The stable surface 36a is configured to have a wider surface in the direction along the belt passing direction than the swing surface 36b, and the stable surface 36a and the swing surface 36b have a predetermined angle. Is formed. The angle θ between the stable surface 36a and the rocking surface 36b is configured to be an obtuse angle range. By adopting such a configuration, the cam member 34 has either a stable surface 36a or a rocking surface 36b as a contact surface with respect to the inclined surface 14 due to the action of a force applied to the lock surface 38, which will be described in detail later. It swings so that it switches to. Therefore, the cam member 34 also has a function as a rotating cam.

  In addition, the cam member 34 according to the embodiment includes a guide portion 40 on the slide surface 36. The guide part 40 is a member that slides along the guide groove 16 formed on the inclined surface 14 of the base member 12, and includes a slide guide part 40a and a positioning guide part 40b. The slide guide portion 40a is constituted by a plate member having a plate surface in a direction along the direction in which the guide groove 16 is formed. The plate thickness of the slide guide portion 40 a is within a range that fits within the width of the guide groove 16, and the plate width is shorter than the length of the guide groove 16. By adopting such a configuration, the cam member 34 can be slid in the belt passing direction and hardly twisted in the width direction.

  The positioning guide portion 40 b is a stress receiver that is provided on the lower end side of the slide guide portion 40 a and receives a pushing back force by the positioning spring 18 provided on the base member 12. When the positioning guide portion 40b is pushed back by receiving the urging force of the positioning spring 18, the entire cam member 34 is pushed back to the initial position (the end portion on the inclined surface 14 where the retractor is disposed). Therefore, even if the seat belt fixing device 10 is disposed sideways as shown in FIG. 14 and the side surface forming the guide groove 16 is positioned on the retractor arrangement side, the cam member 34 is opposite to the retractor arrangement side. There is no risk of falling to the side (lock mechanism operating side).

  The lock surface 38 has a wedge portion 38a formed along a direction orthogonal to the belt passing direction. The wedge portion 38a is a portion that presses the seat belt 60 against the holding surface 26, has a side shape in a mountain shape, and has a corner portion at the apex. With such a configuration, the wedge portion 38a bites into the belt surface of the seat belt 60 when locked.

  The angle of the corner portion forming the wedge portion 38a that is divided when the perpendicular is drawn with respect to the apex of the wedge portion 38a is the angle located on the stable surface 36a side than the angle located on the rocking surface 36b side. It is formed to have an acute angle. This is to increase the wedge effect when the lock mechanism is activated.

  The lock member 42 is a member for connecting the base member 12 and the cover member 24, sandwiching the seat belt 60 between the two members, and fixing it. In the case of the seat belt fixing device 10 according to the embodiment, the lock member 42 is rotatably engaged with the other end portion of the cover member 24 as shown in FIGS. In addition, the lock member 42 is in a state where the holding surface 26 of the cover member 24 that is rotatably engaged with the base member 12 is opposed to the inclined surface 14 of the base member 12 (a state in which both members are closed). The base member 12 can be engaged with the other end portion of the base member 12 after rotating with the engaging portion with the cover member 24 as a base point. With such a configuration, in a state where the lock member 42 is engaged with both the base member 12 and the cover member 24, both members are maintained in a closed state.

  According to the seatbelt fixing device 10 having such a configuration, it is possible to easily pull the sandwiched seatbelt 60 toward the retractor arrangement side. On the other hand, the lock mechanism is easy to work and a strong lock can be applied to pulling to the side opposite to the retractor arrangement side, that is, the lock side. For this reason, when used when the child seat 50 is fixed, the child seat 50 can be more firmly fixed to the vehicle side seat.

Next, with reference to FIGS. 15 to 17, the operation of the locking mechanism in the seatbelt fixing device 10 according to the embodiment will be described.
First, as shown in FIG. 15, the shoulder belt 62 of the seat belt 60 is sandwiched between the cam member and the holding surface of the cover member. At this stage, the cam member 34 is maintained in a state of being biased toward the retractor arrangement side (upper side in the drawing) by the action of the positioning spring 18.

  The cam member 4 disposed on the inclined surface 14 is such that the tip of the wedge portion 38a only intersects the straight line connecting the tips of the pair of convex portions 28a and 28b in a state where the inclined surface 14 and the holding surface 26 are opposed to each other. Has a height. For this reason, the shoulder belt 62 sandwiched between the cam member 34 and the holding surface 26 passes through a path that slightly avoids the tip of the wedge portion 38a. By having such a configuration, the wedge portion 38a and the shoulder belt 62 are always in contact with each other, so that the reaction speed when the cam member 34 is activated with respect to the movement of the shoulder belt 62 can be increased.

  In the seat belt fixing device 10 in such a state, when the shoulder belt 62 is pulled toward the retractor arrangement side indicated by the arrow A, the cam member 34 does not hinder the movement of the shoulder belt 62. For this reason, the shoulder belt 62 can be pulled.

  Next, as shown in FIG. 16, when the shoulder belt 62 is pulled in the direction indicated by the arrow B (on the side opposite to the retractor arrangement side), the wedge portion 38 a in contact with the shoulder belt 62 moves the shoulder belt 62. Move to be dragged. For this reason, the cam member rotates in the direction of the arrow C with the angle between the stable surface of the slide surface and the swing surface as a base point. That is, the contact surface with the inclined surface 14 shifts from the stable surface 36a to the swing surface 36b.

  When the shoulder belt 62 is further pulled in the direction shown by arrow B from the state shown in FIG. 16, the cam member 34 slides in the direction of arrow B along the inclined surface 14 as shown in FIG. The inclination of the inclined surface 14 is configured to approach the restraining surface 26 as it goes in the direction of arrow B. Therefore, when the cam member 34 slides along the inclined surface 14 in the direction of the arrow B, the gap between the wedge portion 38a and the holding surface 26 is narrowed, and the shoulder belt 62 is pressed against the holding surface 26 by the wedge portion 38a. It will be. At this time, the wedge portion 38a bites into the belt surface of the shoulder belt 62 so as not to damage the shoulder belt 62, and exhibits a wedge effect. As a result, the shoulder belt 62 is locked even when a pulling force in the direction of the arrow B is applied, and there is no possibility that the shoulder belt 62 is pulled back in the direction of the arrow B.

  As described above, the cam member 34 according to the embodiment enables both the rotary cam and the slide cam. For this reason, the shoulder belt 62 can be pulled in the direction of the arrow B with a small force. On the other hand, in the direction of arrow B, the seat belt 60 (shoulder belt 62) can be reliably locked even when a large force is applied.

  In the state shown in FIG. 17, when the shoulder belt 62 is pulled again in the direction of arrow A (see FIG. 15), the cam member 34 rotates to the opposite side to the arrow C (see FIG. 16). The contact surface with the surface 14 becomes the stable surface 36a, is dragged by the movement of the shoulder belt 62 and slides to the position shown in FIG. 15, and the shoulder belt 62 (seat belt 60) is unlocked.

DESCRIPTION OF SYMBOLS 10 ......... Seat belt fixing device, 12 ......... Base member, 14 ......... Inclined surface, 14a ...... Convex part, 16 ...... Guide groove, 18 ...... Positioning spring, 20 ...... Engagement Part, 20a ......... through hole, 22 ......... engagement part, 24 ......... cover member, 26 ......... restraining surface, 28a, 28b ......... convex part, 30 ......... engagement part, 30a ... ...... Through hole, 32 ......... engagement part, 34 ......... cam member, 36 ......... sliding surface, 36a ......... stable surface, 36b ......... oscillating surface, 38 ......... locking surface, 38a ......... Wedge part, 40 ......... Guide part, 40a ......... Slide guide part, 40b ......... Positioning guide part, 42 ......... Lock member, 50 ......... Child seat, 52 ......... Base, 54 ... …… Seat, 56 ……… Buckle, 58 ……… Tang plate, 60 ……… Seat belt 62 ......... shoulder belt, 64 ......... waist belt

Claims (6)

A base member having an inclined surface along the belt passing direction;
A cover member having a restraining surface disposed opposite to the inclined surface;
A cam member that is disposed between the inclined surface and the holding surface and has a slide surface that slides relative to the inclined surface, and a lock surface having a wedge portion that sandwiches a seat belt between the holding surface. When,
Have
The inclined surface is configured to be closer to the restraining surface as it is directed to the side opposite to the retractor arrangement side for winding the seat belt,
The seat belt fixing device, wherein the slide surface has a stable surface and a swing surface, and is angled so that an angle formed by the stable surface and the swing surface is an obtuse angle. . The cover member is a direction intersecting with the belt passing direction, and includes convex portions protruding from the restraining surface toward the inclined surface on the entrance side and the exit side of the seat belt,
The cam member is arranged such that the wedge portion is positioned between the pair of convex portions in a state where the inclined surface and the restraining surface face each other, and the wedge portions are the pair of convex portions. The seat belt fixing device according to claim 1, wherein the seat belt fixing device has a height that intersects with a straight line connecting the leading ends of the portions.   The seat belt fixing device according to claim 1 or 2, wherein the inclined surface is configured to increase an inclination angle toward the side opposite to the retractor arrangement side.   The seat belt fixing device according to any one of claims 1 to 3, wherein the base member includes a positioning spring that biases the cam member toward the retractor arrangement side.   The seat belt fixing device according to any one of claims 1 to 4, wherein the restraining surface is constituted by an uneven surface.   The said inclined surface is arrange | positioned along the direction which cross | intersects the said belt passing direction, and is comprised by the some convex part extended in the said belt passing direction. The seat belt fixing device according to claim 1.