JP3966439B2 - Shoulder height adjuster for seat belt - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shoulder height adjuster for a three-point seat belt mounted on an automobile or the like.
[0002]
[Prior art]
In a three-point seat belt device mounted on an automobile or the like, generally, a webbing of a seat belt is fixed to a lap outer anchor provided at a lower side of a vehicle interior side wall and a shoulder of a center pillar portion above the webbing. After passing through the sash guide supported by the anchor, the other end is wound around the winding device. Then, by engaging the tongue plate provided at the intermediate portion of the webbing of the seat belt with the buckle device fixed to the lap inner anchor, the seat belt is put on.
[0003]
In addition, if the shoulder anchor has a function to adjust the height position of the shoulder anchor according to the shoulder height and seat position of the occupant in the seated state, the shoulder anchor is provided with a guide rail and is slidable on the guide rail. A device called a shoulder height adjuster is provided in which an anchor bolt for supporting the sash guide is fixed to a slider that is supported by the slider and has a fixing mechanism that can be fixed at an arbitrary sliding position. It is done.
[0004]
As a mechanism for adjusting and fixing the position of the slider with respect to the guide rail in such a shoulder height adjuster, for example, as disclosed in Japanese Patent Publication No. 3-1176 or Japanese Utility Model Publication No. 3-21316, the guide rail is guided along the guide direction. A plurality of engagement holes (locking holes) are provided, and the slider is penetrated with a lock pin (locking pin) that can be inserted into the engagement hole being biased toward the guide rail. A structure in which an operation knob is provided at the top of the lock pin, that is, the base end opposite to the distal end on the insertion side into the engagement hole, has been put into practical use.
[0005]
Of the techniques described in the above publications, in the former Japanese Patent Publication No. 3-1176, the insertion portion of the lock pin with respect to the engagement hole is covered with a resin material over a required length. In the No.-21316, by adopting a configuration in which the inner surface of the engagement hole is covered with a resin material, even if the lock pin rattles in the engagement hole due to vibration during vehicle running, the occurrence of abnormal noise is suppressed. is doing.
[0006]
[Problems to be solved by the invention]
By the way, according to the techniques described in the above-mentioned publications, since it is necessary to always open a gap between the lock pin and the engagement hole, a difference caused by rattling in the engagement hole of the lock pin is required. Although there is an effect of suppressing the volume of the sound, the occurrence cannot be completely suppressed. Further, in the techniques described in these publications, the resin material is provided at a location where the lock pin and the inner surface of the engagement hole are rubbed, and the resin material and the inner surface of the engagement hole or the lock pin that contacts the resin material are slightly curved. Because of the cylindrical surfaces with different radii, the resin material is gradually scraped and deformed due to the movement of the lock pin from the engagement hole and the load acting when the body vibration or the seat belt webbing is pulled. There is a problem that the sound suppression effect is lost and the durability is inferior.
[0007]
The present invention has been made to solve such a problem, and includes a guide rail having a plurality of engagement holes and a slider having a lock pin that engages with any of the engagement holes. In the shoulder height adjuster for belt, abnormal noise generated between the lock pin and the engagement hole can be suppressed extremely effectively compared to the prior art, and the lock pin and the engagement hole of the guide rail can be stably stabilized. An object of the present invention is to provide a shoulder height adjuster for a seat belt that can be engaged.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the seat belt shoulder height adjuster of the present invention is a seat belt shoulder height adjuster for setting the vertical position of the sash guide that passes through the webbing of the seat belt and changes its direction. There,
A guide rail that is fixed in the passenger compartment in a state in which the guide direction is substantially along the vertical direction, and a plurality of engagement holes are formed in the guide direction;
A slider that holds the sash guide and is slidably supported on the guide rail;
The slider is urged toward the guide rail in the axial direction while penetrating the slider in the axial direction, and the tip end side of the urging direction is inserted into and engaged with one of the engagement holes. While fixing the position on the guide rail, you can see a lock pin with an operation knob on the base end side in the urging direction,
Each engagement hole of the guide rail has a long hole shape in which the opening shape on the insertion entrance side of the lock pin has a long axis in the guide direction. A slope inclined in a direction in which the major axis dimension is shortened is formed, and the lock pin is in a biased state with the top edge of the biasing direction in contact with the slope of the engagement hole, and the lower side surface is engaged. It is in contact with the lower edge of the hole, and is engaged with the engagement hole in a state where there is no gap between the slope of the upper edge of the engagement hole and the lower edge of the engagement hole with no gap. (Claim 1).
[0009]
Here, in the present invention, only the lowermost engagement hole of the guide rail, the upper edge of the lock pin in the urging direction abuts against the slope of the lowermost engagement hole in a urged state, In addition, the lock pin and the slider supporting the lock pin are positioned and fixed by contacting the slider with a slider sliding lower limit position regulating stopper provided on the guide rail via a cushion piece. (Claim 2).
[0010]
When the configuration of the invention according to claim 2 is adopted, the stopper and the slider come into contact with each other through a resin piece provided therebetween, and the stopper and the slider are respectively in contact with the resin piece. It is preferable to adopt a structure that makes surface contact (Claim 3).
[0011]
Furthermore, in the present invention, it is desirable to adopt a configuration (Claim 4) in which a chamfer is applied to the edge of the urging direction front end portion of the lock pin.
[0012]
According to the present invention, the lock pin entrance side opening shape of each engagement hole of the guide rail is a long hole having a long axis in the guide direction, and the long axis dimension of the engagement hole is closer to the upper edge portion in the lock pin insertion direction. A slope that slopes in a direction that shortens is formed, and the upper edge of the tip of the lock pin is brought into contact with the slope in the engaged state of the lock pin, and the lower side is brought into contact with the lower edge of the engagement hole. By setting the state, the lock pin can be engaged with the engagement hole with substantially no gap, and the intended purpose is achieved.
[0013]
That is, the lock pin that is biased in the axial direction and fits into the engagement hole to fix the vertical position of the slider with respect to the slider guide rail is attached to the slope formed on the upper edge of the engagement hole. When the upper edge of the bias direction abuts, the moving end in the axial direction is restricted while leaving an urging force. In this state, the lower side surface of the lock pin contacts the lower edge of the engagement hole. Touch. In such a state, the lock pin is sandwiched between the upper edge slope and the lower edge of the engagement hole and is pressed against the slope by the biasing force, and there is substantially no gap. Thus, the vibration does not occur due to the vibrations that are fitted and engaged in the engagement holes and act in normal use conditions such as vibrations during vehicle travel, and no abnormal noise is generated.
[0014]
In addition, the slope of the upper edge of the engagement hole is such that the tip of the lock pin abuts at an arbitrary position in a biased state, thereby guiding the lock pin and its lower side surface abutting against the lower edge of the engagement hole. It also plays a role of moving to a certain position, and a stable engagement state is always obtained. It also has a skip mechanism that allows the lock pin to move away from the upper edge of the engagement hole by pushing up the slider and to come out of the upper edge of the engagement hole, and to adjust the height by engaging with the upper engagement hole. Yes.
[0015]
In the invention according to claim 2, when the lock pin is engaged with the lowest engagement hole in order to position the slider at the lowest position, the slider slide lower limit position restriction stopper provided on the guide rail is used. The moving end is described when the slider abuts via the cushion piece, and the lock pin leaves an urging force on the lowermost engagement hole with the slider abutting against the stopper via the cushion piece. It touches the edge slope. Accordingly, in a state in which the lock pin to the lowest engaging hole is engaged, without contact with the lock pin to the lower edge of the engaging hole, the locking pin and the slope of the engaging hole on the rim, the lock The pin is held between the slider supporting the pin and the stopper via the cushion piece, so that no rattling occurs as in the engagement state with the other engagement holes, and the slider lower limit position Is surely regulated by the stopper, and the lock pin is always engaged. In addition, according to this configuration, there is also an advantage that it is not necessary to improve the vertical positional relationship between the slider sliding lower limit position restricting stopper and the lower edge of the lowest engagement hole.
[0016]
The inventions is related to claim 3, the resin pieces used as a cushion member, which the stopper and the slider is configured to respectively surface contact with the resin piece, thereby forming a stopper and a slider reliably prevent the generation of ions by metal-to-metal contact, moreover, dendritic Aburahen is only the front and back surfaces without sliding contact with the metal sandwiched by surface contact, it is scraped resin piece deformation I don't have to.
[0017]
Further, as in the invention according to claim 4, when chamfering is applied to the edge of the lock pin in the urging direction, stress concentration on the edge at the time of sliding contact with the guide rail of the lock pin is alleviated, and both wear or Damage can be prevented and the movement of the upper edge of the engagement hole with respect to the slope can be made smooth.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an exploded perspective view of an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view showing a state in which the lock pin 4 is engaged with the lowest engagement hole 1d. FIG. 3 is an enlarged cross-sectional view of a main part showing a state in which the lock pin 4 is engaged with an engagement hole 1a other than the lowest position. In FIG. 1, illustration of the anchor bolt 5 and the sash guide 6 is omitted in order to avoid complication of the drawing.
[0019]
A plurality of engagement holes 1a to 1d are formed in the guide rail 1 in the guide direction (longitudinal direction), and a side wall in a vehicle interior such as a center pillar, for example, with the guide direction substantially along the vertical direction. It is fixed to. The slider 2 is slidably supported along the guide rail 1. Further, the guide rail 1 is formed with a slider sliding lower limit position restricting stopper 1e further below the lowermost engaging hole 1d so as to protrude toward the slider 2 at a substantially central portion in the width direction. The upper surface of the slider sliding lower limit position regulating stopper 1e is a flat surface. Reference numeral 21 denotes a resin flake for smooth sliding between the slider 2 and the guide rail 1.
[0020]
A resin-made slide cover 3 that covers the surface of the slider 2 is attached. The slide cover 3 is fixed to the slider 2 by a plurality of claws 3a to 3c formed so as to protrude to the slider 2 side to cover the slider 2 and extends to both the upper and lower sides of the slider 2. , 3e covers the guide rail 1.
[0021]
The slider 2 is formed with a through hole 2a for penetrating the lock pin 4 and a through long hole 2b for penetrating a nut 51 for fixing an anchor bolt 5 described later, and the width of the lower end surface thereof. A stopper abutting portion 2c that abuts against the slider sliding lower limit position restricting stopper 1e at the sliding lower limit position with respect to the guide rail 1 is formed so as to protrude toward the guide rail 1 at the approximate center in the direction. . The lower surface of the stopper contact portion 2c is a flat surface, and the above-described slide cover 3 is integrally formed with a cushion piece 3g that covers the lower surface of the stopper contact portion 2c in close contact with the slider 2 in a surface contact state. Has been. The lower surface of the cushion piece 3g is a flat surface and comes into contact with the upper surface of the slider sliding lower limit position regulating stopper 1e formed on the guide rail 1 in a surface contact state.
[0022]
The lock pin 4 is inserted into the through hole 2a of the slider 2 in a state of being accommodated in the upright portion 3f formed on the slide cover 3, and the compression coil spring 41 is inserted between the upright portion 3f and the ceiling portion. Are supported by the slider 2 and the slide cover 3 while being urged in the axial direction toward the guide rail 1, and the front end side in the urging direction is inserted into any of the engagement holes 1 a to 1 d of the guide rail 1. Thus, the slider 2 can be positioned and fixed on the guide rail 1 by being engaged. As shown in FIG. 3, a chamfered portion 4b having a radius of about R1, that is, a curved chamfered portion 4b having a radius of about 1 mm is uniformly formed at the edge of the lock pin in the urging direction.
[0023]
Further, a flange portion 4a is formed at the top portion of the lock pin 4, that is, the end portion on the proximal end side in the urging direction, and the flange portion 4a is exposed to the outside from the side opening portion of the upright portion 3f of the slide cover 3. It protrudes and is engaged with an operation knob 42 that covers the upright portion 3f. Therefore, the lock pin 4 can be detached from the engagement holes 1 a to 1 d of the guide rail 1 against the urging force of the compression coil spring 41 by grasping and pulling the operation knob 42.
[0024]
The anchor bolt 5 is fixed to the slider 2 by being screwed through the slide cover 3 into a nut 51 that is inserted into the through-hole 2b of the slider 2 and is in a non-rotating state. A sash guide 6 is swingably supported by the anchor bolt 5. The sash guide 6 is formed with a slit 6a for inserting the webbing W of the seat belt at the tip, and at the base. A through hole 6b into which the anchor bolt 5 is inserted is formed, and a portion excluding the vicinity of the through hole 6b is covered with resin. The bases of the anchor bolt 5 and the sash guide 6 are covered with a resin sash guide cover 7. The sash guide cover 7 has an opening 7a for exposing the operation knob 42 to the vehicle interior side, and the tip of the support portion 7b is in contact with the surface of the slide cover 3. Thus, it is fixed to the slide cover 3 by the claws 7c, 7d formed on the upper and lower sides.
[0025]
The guide rail 1 described above is formed by pressing a flat metal member, and each of the engagement holes 1a to 1d has a perspective view in FIG. 4 (A), and FIG. As shown in the BB cross-sectional view, the opening shape on the lock pin insertion side is a long hole shape having a long axis in the guide direction of the guide rail 1, and approximately half of the lower edge 11 side is punched. The lower edge 11 penetrates and is formed by a cylindrical inner surface orthogonal to the surface of the guide rail 1. Further, substantially half of the upper edge 12 side is formed by a bent piece 13 formed by bending a part of a flat metal member forming the guide rail 1 to the back side in the insertion direction of the lock pin 4 by about 30 °. . Therefore, the upper edge 12 of each engagement hole 1a-1d has a slope S formed by the surface of the bent piece 13, that is, the longer axis dimension of the engagement holes 1a-1d becomes shorter toward the end of the lock pin 4 in the insertion direction. A slope S inclined in the direction is formed. Of the engagement holes 1a to 1d, the upper three engagement holes 1a to 1c have the same major axis dimension, and the lowest engagement hole 1d has the major axis dimension of the upper three engagement holes 1a to 1d. It is slightly longer than the major axis dimension of the holes 1a to 1c.
[0026]
In the embodiment of the present invention described above, the slider 2 is slid along the guide rail 1 while the operation knob 42 is pulled against the urging force of the compression coil spring 41, and the desired engagement holes 1a to 1d are formed. By releasing the operation knob 42 at the formation position, the lock pin 4 is urged toward the guide rail 1 by the compression coil spring 41. At this time, the lock pin 4 is brought into contact with the slope S by the biasing force of the compression coil spring 41 by the tip edge portion of the lock pin 4 coming into contact with an arbitrary position of the slope S at the lock pin insertion side entrance of the engagement holes 1a to 1d. Guided and moved downward together with the slider 2 and the like to contact the lower edge 11 of the engagement holes 1a to 1d, and the lock pin 4 is sandwiched between the slope S and the lower edge 11 of the engagement holes 1a to 1d in the biased state. Engage. At this time, since the chamfered portion 4b is formed at the leading edge of the urging side of the lock pin 4, both slide smoothly with respect to the slope S, and both are damaged even when sliding on the guide rail 1. Such a problem does not occur.
[0027]
When the lock pin 4 engages with the engagement holes 1a to 1c other than the lowest, the lock pin 4 guided by the slope S and moved downward as shown in FIG. The lower side surface stops by contacting the cylindrical inner surface of the lower edge 11 of the engagement hole 1a (or 1b, 1c, hereinafter the same), and enters the engaged state. The lock pin 4 in the engaged state has a chamfered portion 4b at the tip thereof in contact with the slope S of the upper edge 12 of the engagement hole 1a, and a lower surface in contact with the lower edge 11 of the engagement hole 1a. Thus, the biasing force by the compression coil spring 41 is still applied to the lock pin 4. Therefore, in this state, the lock pin 4 is sandwiched between the slope S of the engagement hole 1a and the lower edge 11 with the urging force of the compression coil spring 41 remaining substantially without any gap. It does not rattle due to vibrations or the like during traveling, and no abnormal noise is generated.
[0028]
On the other hand, when the lock pin 4 engages with the lowest engagement hole 1d, when the lock pin 4 moves downward together with the slider 2 etc. as guided by the slope S, as shown in FIG. The stopper abutting portion 2c is stopped by being brought into contact with the slider sliding lower limit position regulating stopper 1e of the guide rail 1 via the cushion piece 3g made of resin, and is brought into an engaged state. In this engaged state, the slider 2 comes into contact with the slider sliding lower limit position restricting stopper 1e with the cushion piece 3g interposed therebetween, and the lock pin 4 has left the urging force of the compression coil spring 41 as described above. In this state, it abuts against the slope S of the engagement hole 1d. Therefore, even in this case, the gap between the lower edge 11 of the engagement hole 1d and the lock pin 4 whose major axis dimension is longer than that of the other engagement holes 1a to 1c. Although there is actually a gap, the slider 2 and the slide cover 3 that support the lock pin 2 are prevented from moving downward by the slider sliding lower limit position restricting stopper 1e via the cushion piece 3g. Therefore, similarly to the above, the lock pin 4 does not rattle in the engagement hole 1d due to vibration or the like when the vehicle travels, and no noise is generated.
[0029]
Here, since the resin cushion piece 3g is interposed between the slider sliding lower limit position regulating stopper 1e and the stopper abutting portion 2c, no abnormal noise is generated due to contact between metals. The cushion piece 3g is merely brought into surface contact with the slider sliding lower limit position regulating stopper 1e and the stopper contact portion 2c and is not slidably contacted. Therefore, deformation due to wear or the like hardly occurs.
[0030]
Further, due to the presence of the slider sliding lower limit position restricting stopper 1e, the lock pin 4 does not move downward beyond the lowest-order engagement hole 1d, and the lock pin 4 always moves to the lowest-order engagement hole 1d. In this engaged state, the lower surface of the lock pin 4 does not need to abut against the lower edge 11 of the engagement hole 1d. Therefore, the slider sliding lower limit position regulating stopper 1e and the engagement hole 1d It is not necessary to make the vertical positional relationship with the lower edge 11 strict.
[0031]
【The invention's effect】
As described above, according to the present invention, the slope of the direction in which the opening diameter gradually decreases toward the lock pin insertion direction on the upper edge of the positioning hole on the guide rail of the slider holding the sash guide. The locking pin for positioning and fixing the slider has an upper edge at the tip abutting against the slope in a state where the biasing force toward the guide rail is left in the engaged state with the engaging hole, and the lower side surface is Since the lock pin is in contact with the lower edge of the engagement hole, the lock pin is urged and sandwiched between the slope of the upper edge of the engagement hole and the lower edge of the engagement hole with substantially no gap. It does not rattle due to vibration or the like, and no abnormal noise is generated.
[0032]
Also, a slider slide lower limit position restricting stopper is provided on the guide rail. When the lock pin is engaged with the lowest engagement hole, the lock pin is prevented from moving downward by the stopper. If it is configured to be in contact with the slope of the upper edge of the engagement hole with excess urging force, the same effect as described above can be obtained even in the engagement state with the lowest engagement hole. In addition, the lock pin does not move below the lowest engagement hole. In this case, by providing a resin piece (cushion piece) in surface contact between the stopper and the slider, it is possible to prevent the generation of noise due to the contact between the stopper and the slider. In addition, the resin piece can be prevented from being deformed due to wear or the like due to long-term use.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of an embodiment of the present invention, showing a state in which a lock pin 4 is engaged with the lowest engagement hole 1d.
FIG. 3 is an enlarged cross-sectional view of a main part showing a state in which the lock pin 4 according to the embodiment of the present invention is engaged with an engagement hole 1a other than the lowest position.
4A and 4B are explanatory views of the structure of the engagement holes 1a to 1d formed in the guide rail 1 according to the embodiment of the present invention. FIG. 4A is a perspective view, and FIG. is there.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Guide rail 1a-1d Engagement hole 1e Stopper 11 for slider sliding lower limit position control Lower edge 12 Upper edge 13 Bending piece S Slope 2 Slider 2c Stopper contact part 3 Slide cover 3g Cushion piece 4 Lock pin 4b Chamfer 41 Compression Coil spring 42 Operation knob 5 Anchor bolt 51 Nut 6 Sash guide 7 Sash guide cover

Claims (4)

A shoulder height adjuster for a seat belt for setting the vertical position of a sash guide that passes through the webbing of the seat belt and changes its direction,
A guide rail that is fixed in the passenger compartment in a state in which the guide direction is substantially along the vertical direction, and a plurality of engagement holes are formed in the guide direction;
A slider that holds the sash guide and is slidably supported on the guide rail;
The slider is urged toward the guide rail in the axial direction while penetrating the slider in the axial direction, and the tip end side of the urging direction is inserted into and engaged with one of the engagement holes. While fixing the position on the guide rail, you can see a lock pin with an operation knob on the base end side in the urging direction,
Each engagement hole of the guide rail has a long hole shape in which the opening shape on the insertion entrance side of the lock pin has a long axis in the guide direction. A slope inclined in a direction in which the major axis dimension is shortened is formed, and the lock pin is in a biased state with the top edge of the biasing direction in contact with the slope of the engagement hole, and the lower side surface is engaged. It is in contact with the lower edge of the hole, and is engaged with the engagement hole in a state where there is no gap between the slope of the upper edge of the engagement hole and the lower edge of the engagement hole with no gap. Shoulder height adjuster for seat belts Only in the lowest engagement hole of the guide rail, the upper edge of the urging direction tip of the lock pin abuts against the slope of the lowest engagement hole , and the slider is in the guide rail The lock pin and the slider that supports the lock pin are positioned and fixed by coming into contact with a slider sliding lower limit position regulating stopper provided on the cushion pin via a cushion piece. The shoulder height adjuster for a seat belt according to claim 1. The seat belt according to claim 2, wherein the stopper and the slider are in contact with each other via a resin piece provided therebetween, and the stopper and the slider are in surface contact with the resin piece, respectively. Shoulder height adjuster. The shoulder height adjuster for a seat belt according to claim 1, wherein a chamfer is applied to an edge of a front end portion of the lock pin in the urging direction.

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