JPH0672285A - Through guide structure of seat belt - Google Patents

Abstract

PURPOSE:To improve the operating property as well as to improve the fitness of a seat belt to the upper body of a sitter. CONSTITUTION:A through guide 12 to hold the upper end of the shoulder belt of a seat belt 16 is projected movable vertically at the shoulder part of a seat back 14. And the through guide 12 is connected interlockable to a driving shaft 36 at the rear and side part of a seat cushion 34 through a second endless chain 44. The driving shaft 36 is journalled movable in the axial direction, and a second sprocket 70 for the second endless chain 44 is formed to be free to the driving shaft 36 at the pushing-in position of the driving shaft 36.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat belt through guide structure which is provided on a shoulder portion of a seat back and vertically regulates an upper supporting position of the shoulder belt of the seat belt.

[0002]

2. Description of the Related Art For example, in an automobile or the like, a seat belt for preventing a seated person from jumping out is generally used as a front seat (driver seat, assistant seat).
Of course, it is also installed on the rear seats.

A seat belt corresponding to a front seat is constructed to be pulled by a towing means called a retractor built in a center pillar or the like of a body of an automobile so that it can be pulled out at the time of use. The seat belt is extended through, for example, an upper support member called an intermediate plate provided on a center pillar or the like, and is loosely inserted with a tongue and connected to a floor anchor.

A buckle capable of inserting and locking the tongue of the seat belt is arranged on the opposite side of the seat, and the seat belt is used by inserting the tongue into the buckle and withdrawing the seat belt.

Such a seat belt has a so-called 3 shape, which is substantially ∠-shaped in front of a seated person.
It is configured to be point-supported. In the three-point support type seat belt, the intermediate plate (upper support member),
The inclined portion between the tongues is defined as a shoulder belt that holds the portion from the shoulder to the chest of the seated person, and the horizontal portion between the tongue and the floor anchor is defined as a waist belt that holds the waist portion of the seated person.

[0006]

By the way, in the known construction, the intermediate plate is usually mounted so that its position relative to the body of the vehicle is substantially constant. That is, since the upper support position of the shoulder belt by the intermediate plate is constant, the holding angle of the shoulder belt with respect to the seat front, that is, the upper body of the seated person is always constant regardless of the body shape of the seated person.

Here, it is desirable that the shoulder belt is located at the center of the shoulder of the seated upper body so as not to hit the neck. However, in the known configuration, since the holding angle by the shoulder belt is constant, depending on the body shape of the seated person, that is, the height of the sitting height, the seated belt is displaced from the center of the seated person's shoulder. Will hold the upper body. Therefore, a decrease in the fit of the shoulder belt to the seated person cannot be avoided.

[0008] A reduction in the fit of the shoulder belt to the upper body of the seated person is not preferable because not only the comfort of the seated person is deteriorated but also the original safety ensuring function of the seat belt may be deteriorated.

Further, in the front seat, normally,
The entire seat is supported by a seat slide device so as to be slidable in the front-rear direction, and the seat back is swingable in the front-rear direction by a reclining device. However, since the intermediate plate, buckle, etc. on which the seat belt is supported are provided on the body of the automobile, when the seat slides or the seat back swings, the upper body of the seated person moves relative to the seat belt. To do.

Particularly, when the seat back is tilted largely backward, the upper body of the seated person moves in the direction away from the shoulder belt, so that a gap is generated between the upper body of the seated person and the shoulder belt. Therefore, also in this respect, a decrease in the fit of the shoulder belt to the upper body of the seated person cannot be avoided.

Here, as a known configuration, a configuration is known in which the vertical position of the intermediate plate can be adjusted. With such a configuration, the upper support position of the shoulder belt can be appropriately adjusted according to the body shape of the seated person, the seat position, the reclining angle, and the like, so that a good fitting property can be obtained.

However, in such a structure, it is necessary to raise the body or twist the body in the direction of the center pillar when adjusting the vertical position of the intermediate plate. Therefore, the vertical position of the intermediate plate suitable for the seated person cannot be easily adjusted, and the fit feeling in the seated state cannot be easily confirmed at the time of adjustment, and good operability cannot be ensured.

In such a structure, each time the seat position, the reclining angle, etc. are changed,
Since the vertical position of the intermediate plate has to be readjusted, the operation becomes complicated, which is not preferable.

It is an object of the present invention to provide a seat belt through guide structure which improves the fit of the seat belt to the upper body of a seated person and improves the operability.

[0015]

In order to achieve this object, according to the present invention, a drive shaft having an operating handle at one end is axially movable with respect to the first and second transmission pulleys. In addition, it is rotatably supported integrally with each transmission pulley via a detent. Further, a through guide supporting the upper end of the shoulder belt of the seat belt is provided so as to be able to move up and down on either the side surface or the front surface of the seat back shoulder portion, and the first transmission pulley is provided to the reclining device and the second transmission pulley. Are connected to the through guide via the corresponding first and second connecting strips.

The first transmission pulley is free with respect to the drive shaft at either the pull-out position or the push-in position of the drive shaft, and the through guide is independently operated by rotating the operation handle at that position. It can be moved up and down. Further, at the other position of the drive shaft, the first and second transmission pulleys are both rotatably connected integrally with the drive shaft by the engagement of the detent, and by the rotation operation of the operation handle at that position,
The through guide is movable in a corresponding direction in association with the swing of the seat back accompanying the operation of the reclining device.

[0017]

Embodiments of the present invention will now be described in detail with reference to the drawings.

As shown in FIGS. 1 and 2, in the seat belt through guide structure 10 according to the present invention, the through guide 12 is provided so as to be movable up and down on the side surface of the shoulder portion of the seat back 14.

The through guide 12 is formed in, for example, a substantially ring shape into which a corresponding seat belt 16 provided on the body of an automobile or the like can be freely inserted and supported. As shown in FIG. 2, for example, a seat belt 16 of a seat 18 mounted as a front assistant seat is a retractor incorporated in a center pillar 20 of a body or the like called a retractor.
It is drawn in by 22 and can be pulled out at the time of use.

One end of the seat belt 16 is extended, for example, from an opening (not shown) of the center pillar 20 through an intermediate plate serving as an upper support member 24 of the seat belt, and the tongue 26 is loosely inserted to the floor anchor. It is connected to 28.

Such a seat belt 16 is shown in FIGS.
As shown in, for example, it is used by inserting and locking the tongue 26 in the buckle 30 provided on the opposite side of the seat 18 with the withdrawal of the seat belt 16 from the retractor (traction means) 22. As can be seen from FIG. 3, a portion between the intermediate plate (upper support member) 24 of the seat belt 16 and the tongue 26 serves as a shoulder belt 16a for holding a portion of the seated person from the shoulder to the chest, and also the tongue and the floor. A space between the anchors 28 is defined as a waist belt 16b that holds the waist of the seated person.

The seat belt 16, the retractor 22, the intermediate plate 24, and the floor anchor 28 are well known in the art, and their construction is not the purpose of the present invention.

Here, the seat 18 is formed as a seat with a reclining device, and the seat back 14 is moved forward and backward with respect to the seat cushion 34 by the operation of a reclining device (not shown) that is interlocked with the rotation operation of the operation handle 32. It is possible to swing. As shown in FIGS. 1 and 2, the operation handle 32 includes, for example, a seat cushion 34.
The reclining device is provided on the drive shaft 36 disposed on the rear side of the rear side, and through the first transmission belt 38 of the drive shaft and the first connecting strip 42 wound between the transmission pulley 40 of the reclining device. It is linked so that it can be linked to.

An endless chain is usually used as the first connecting strip 42, and sprockets corresponding to the endless chain are formed as the first transmission pulley 38 and the transmission pulley 40 of the reclining device, respectively.

The structure of such a reclining device is well known, and the structure itself is not the subject of the present invention, and therefore will not be described in detail.

In the present invention, the through guide 12 is provided with the operation handle 32 via the second connecting strip 44.
It is linked so that it can be linked to.

As shown in FIG. 4, for example, the slider 46
However, it is supported by a pair of guide rails 48 so as to be slidable in the vertical direction, that is, capable of moving up and down. The pair of guide rails 48 are, for example, each formed in a substantially U-shaped cross section having an opening in the longitudinal direction, and are fixed to the base plate 50 while being separated from each other by a predetermined distance in a state where the openings are opposed to each other.

The slider 46 has a pair of projecting pieces on its side surface.
46a is integrally formed, and is slidably supported between the pair of guide rails 48 by loosely inserting the protruding piece into the opening.

The slider 46 has, for example, a screw hole.
The through guide is attached to the slider by screwing the threaded portion 54 of the through guide 12 into the screw hole.

The base plate 50 is fixed to a seat back frame (not shown) at a corresponding position, and the through guide 12 is laterally moved through a slit 56 provided on a side surface of a shoulder portion of the seat back 14. It is projected (see FIGS. 1 and 2).

Here, the base plate 50 is formed with a slit 58 between a pair of guide rails 48, and a second connecting strip 44 is inserted through a spacer 60 which allows the slit to be loosely inserted.
Is partially fixed to the slider 46. As the second connection strip 44, similar to the first connection strip 42, for example,
An endless chain can be used, and the mounting piece 44a and the slider 46 provided as a part of the endless chain are
It is fixed via the spacer 60 by a set screw 62 or the like.

Then, for example, a transmission pulley, that is, a sprocket 64 corresponding to the second endless chain 44 is provided on the upper end portion of the base plate 50 via a spacer 66 by means of a pivot pin 68 made of a stepped bolt or the like. It is rotatably attached.

As shown in FIG. 1, the second endless chain 44 includes, for example, the sprocket 6 of the base plate.
4, which is wound around the second transmission pulley 70 of the drive shaft 36 and the transmission pulley 71 of the reclining device, and the operation handle 32 and the through guide 12 are linked so as to be interlockable via the second endless chain. There is.

As shown in FIG. 5, a support plate 74 bent and formed in a predetermined shape is fixed to the inside of the side bracket 72 fixed to the seat cushion frame or the like. Then, a support pin 76 having a head 76a at one end
Is fixed to the support plate 74 and protrudes toward the side bracket.

As can be seen from FIG. 6 in addition to FIG. 5, a drive shaft having an operation handle 32 fixed to one end is provided.
36 is formed with a recess 78 into which the support pin 76 can be loosely inserted. Then, the drive shaft 36 is loosely inserted into the insertion hole 80 of the side bracket 72, and the recess 78 of the drive shaft is formed.
A support pin 76 is loosely inserted in the drive shaft so that the drive shaft is movably mounted in the axial direction and is axially supported.

As shown in FIG. 6, the operation handle 3
2, between the drive shaft 36, for example, spline joint 82
Etc. are integrally and rotatably connected and fixed by such means.

As shown in FIGS. 5 and 6, the drive shaft 36
Is formed to have a flange 84 on the outer peripheral surface, and a pair of bushes 86, 87 with a flange, for example, are interposed between the flange and the boss 32a of the operation handle 32 with the flanges in contact with each other.

The recess 78 of the drive shaft is the step 78a.
The biasing means 90 formed of a compression coil spring is stretched and wound around the pivot pin 76 between the step portion and the support plate 74.

In such a structure, the drive shaft 36 is biased in the protruding direction from the side bracket 72 under the biasing force of the biasing means (compression coil spring) 90, and the operating handle 32 to the left in FIG. The pressing pushes the drive shaft against the biasing force of the biasing means.

The shaft portion of the bush 86 arranged on the flange side of the drive shaft 36 is, for example, the flange 84.
The outer diameter is preferably smaller than the outer diameter.

Then, the first and second endless chains 42, 44 are provided between the side bracket 72 and the support plate 74.
The first and second sprockets 38 and 70 respectively corresponding to the above are arranged and rotatably connected integrally with the drive shaft 36.

Incidentally, reference numeral 91 in FIG. 1 indicates a tensioner for giving an appropriate tensioning force to the second endless chain 44. The tensioner 91 is usually formed as a sprocket corresponding to an endless chain.

Here, in the present invention, FIGS.
As shown in FIG. 7, the drive shaft 36 and the first and second sprockets 38, 70 are integrally and rotatably connected to each other via a detent such as a spline joint 92, and the first Only sprocket 38 is configured to disengage from the spline joint by pushing the drive shaft.

For example, as shown by the arrow in FIG. 5, when the operating handle 32 is pushed in the axial direction of the drive shaft 36 against the biasing force of the biasing means 90, as shown in FIG. The first sprocket 38 is disengaged and the fleet between the drive shaft and the first sprocket becomes a fleet. Then, when the operation handle 32 is rotated from such a state, only the second sprocket 70 rotates together with the operation handle, that is, the drive shaft 36, and the operation handle rotates through the second endless chain 44. The force is transmitted only to the through guide 12 (see FIG. 1).

Then, with respect to the reclining device which does not operate, the through guide 12 is independently operated, and only the vertical position of the through guide with respect to the seat back 14 is adjusted.

In such a structure, since the vertical position of the through guide 12 can be adjusted regardless of the reclining angle of the seat back 14, the upper support position of the shoulder belt 16a,
That is, the holding angle of the portion from the shoulder to the chest by the shoulder belt can be appropriately adjusted according to the body shape of the occupant, preferences, and the like. Therefore, the fit of the shoulder belt to the upper body of the seated person is improved, and the comfortability and safety of the seated person are improved.

When the pressing force of the operating handle 32 is released after the vertical position of the through guide 12 is adjusted, the operating handle, that is, the drive shaft 36, projects from the side bracket 72 under the biasing force of the biasing means 90. Biased to. Then, under the movement of the drive shaft 36, the drive shaft and the first sprocket 38 are reconnected by the spline joint 92 (see FIG. 5).

When the operating handle is rotated while the drive shaft 36, that is, the operating handle 32 is in the protruding state, the spline joint 92 connects the first and second operating handles.
The sprockets 38, 70 rotate together with the drive shaft in corresponding directions. Then, the reclining device and the through guide 12 are actuated together via the first and second endless chains 42 and 44, and the reclining angle of the seat back 14 and the vertical position of the through guide are adjusted.

As described above, according to the through guide structure 10 for a seat belt of the present invention, the through guide 12 provided on the shoulder portion of the seat back 14 follows the swing of the seat back 14 in the corresponding direction. It is possible to move to. In other words, when the seat back 14 reclines, even if the upper body of the seated person shifts with respect to the seat back 14, the through guide 12 moves in the vertical direction according to the reclining angle, so that the shoulder of the seated person's upper body does not move. The belt 16a is sufficiently held with a good support angle.

Therefore, it suffices to adjust the support angle of the shoulder belt 16a suitable for one's own body shape and taste, and the operation is not complicated. Therefore, the operability by the seated person is improved.

The through guide 12 is the seat back.
Since it is provided on the shoulders of 14, it moves integrally as the seat position changes. That is, even if the front and rear positions of the seat 18 are changed, the positional relationship of the shoulder belt 16a with respect to the seat back 14 does not change. Therefore, even if the seat position is changed, the shoulder belt 16a of the seat belt does not separate from the seated person's shoulder and chest, and a good fit property independent of the seat position can be secured. The fit of the shoulder belt to the upper body of the seated person is improved.

Further, according to the present invention, the vertical position of the through guide 12 is adjusted by using the operation handle 32 of the reclining device provided on the side of the seat cushion. That is, since it is not necessary for the seated person to twist or raise the upper body when adjusting the vertical position of the through guide 12, the fit feeling in the seated state can be easily confirmed.

Therefore, the vertical position of the through guide 12 suitable for itself can be easily adjusted, and in this respect, the operability is sufficiently improved.

According to this structure, it is sufficient to connect the drive shaft 36 and the through guide 12 via the second endless chain 44 so that they can be interlocked with each other. Therefore, the structure becomes complicated and the size becomes large. Can be sufficiently prevented.

Reference numeral 94 in FIGS. 5 and 7 indicates a so-called finisher (decorative member) for preventing the exposure of the mechanical portion and the like and improving the overall appearance quality of the sheet 18.

Here, in the embodiment, the through guide
12 is projected on the side surface of the shoulder portion of the seat back 14,
It is sufficient if the seat belt 16 can be loosely inserted and supported. Therefore, the present invention is not limited to this. For example, a through guide may be provided so as to protrude from the front surface of the shoulder portion of the seat back.

Further, in the embodiment, the operating handle 32
Is provided on the rear side of the seat cushion 34, but is not limited to this as long as it can be operated by the seated person, and may be provided on the side of the lower end of the seat back 14 or the like.

However, if the operation handle 32 is provided on the rear side of the seat cushion 34, the occupant can easily operate the seat cushion without twisting or raising the upper body, so that the operability is surely improved.

The first sprocket 38 is configured to be free from the drive shaft 36 when the operating handle 32 is pushed in. However, the present invention is not limited to this, and when the operation handle 32 is pulled out,
The first sprocket 38 may be free from the drive shaft 36.

The first and second connecting strips 42 and 44 are formed of endless chains, and the first and second transmission pulleys 38 and 70 are formed of corresponding sprockets. However, since it is sufficient to transmit the rotation of the drive shaft 36 to the reclining device and the through guide 12, respectively, the present invention is not limited to this.
While making the endless belt with teeth a connecting strip,
A belt pulley with corresponding teeth may be used as the transmission pulley.

Further, the drive shaft 36 and the first and second sprockets 38, 70 are integrally and rotatably connected by a spline joint 92, but it is sufficient if they are integrally rotatably connected. , Not limited to spline fittings,
For example, a non-circular detent shape may be used for connection.

However, if the drive shaft 36 and the first and second sprockets 38, 70 are connected by the spline joint 92, the angle of the sprocket with respect to the drive shaft is not limited when the first sprocket is engaged. The engagement of the first sprocket from the disengaged state can be easily performed.

The through guide 12 includes the slider 46,
Although it is provided on the shoulder portion of the seat back 14 via the guide rail 48 and the like, it is sufficient if it can move in the vertical direction of the seat back, so the present invention is not limited to this, and the seat back is provided via other means or the like. It may be provided on the shoulder portion of the.

In this embodiment, the seat belt 16 is arranged on the right side of the front of the seat 18, and the through guide 12 is provided on the right shoulder of the seat back correspondingly. However, conversely, the present invention may be applied to a configuration in which the seat belt is arranged on the left front side of the seat. In this case, corresponding to the seat belt,
It goes without saying that the through guide 12 is provided on the front left side of the seat 18.

Although the seat belt through guide structure of the present invention is suitable for an assistant seat, the present invention is not limited to this, and the present invention can be applied to other seats such as a driver seat and a rear seat.

The present invention is not limited to seats for automobiles as long as the seat belt is attached, and the present invention may be applied to seats for trains, airplanes, ships, etc., for example.

The above-mentioned embodiments are for explaining the present invention, and do not limit the present invention in any way.
It goes without saying that the present invention includes all those which are modified or modified within the technical scope of the present invention.

[0068]

As described above, according to the through guide structure for a seat belt according to the present invention, the through guide provided on the shoulder portion of the seat back follows the swing of the seat back in the corresponding direction. It is movable. Therefore, even if the reclining angle of the seat back is changed, the shoulder belt is sufficiently held in a good supporting angle with respect to the upper body of the seated person, and the fit of the shoulder belt is sufficiently improved.

Since it suffices to once adjust the support angle of the shoulder belt suitable for one's body shape, taste, etc., the operation is not complicated and the operability is surely improved.

Further, since the through guide is provided on the shoulder portion of the seat back, even if the seat position is changed,
The shoulder belt does not separate from the seated person's shoulders and chest, and good fit characteristics that are independent of the seat position can be secured. Therefore, also in this respect, the fit of the shoulder belt to the upper body of the seated person is improved.

Further, in the present invention, the vertical position of the through guide is adjusted by using the operation handle of the reclining device provided on the seat cushion side. In other words, when adjusting the vertical position of the through guide,
Since the seated person does not need to twist or raise the upper body, the fit feeling in the seated state can be easily confirmed.

Therefore, the vertical position of the through guide suitable for itself can be easily adjusted, and also in this respect, the operability is sufficiently improved.

If the operation handle is provided on the rear side of the seat cushion, the occupant can easily operate the seat cushion without twisting or raising the upper body, so that the operability is surely improved.

If the drive shaft is biased in the projecting direction under the biasing force of the biasing means, the operating handle is set and held in the pull-out position under the biasing force. The engagement state of the detents between the transmission pulleys can be reliably maintained, and accidental disengagement between the detents, malfunction, etc. can be reliably prevented.

Further, if the drive shaft and the first and second transmission pulleys are connected by the spline joint, the angle of the sprocket with respect to the drive shaft is not limited when the first transmission pulley is engaged, so that the engagement is released. The first transmission pulley can be easily engaged from the state.

Further, a through guide and a part of the second connecting strip are attached to a slider supported by a guide rail so as to be able to move up and down, so that the rotational operation force of the operating handle can be transmitted and converted to the vertical movement of the through guide. If this is the case, it is possible to sufficiently prevent the structure from becoming complicated and large.

[Brief description of drawings]

FIG. 1 is a schematic front view of a through guide structure for a seat belt according to the present invention.

FIG. 2 is a schematic perspective view of a seat to which a seat belt and a through guide are attached.

FIG. 3 is a front view of the seat when the seat belt is worn.

FIG. 4 is a schematic partially exploded perspective view of a seat belt through guide structure, centering on the through guide.

FIG. 5 is a schematic vertical cross-sectional view centered on the drive shaft in the pull-out position of the operation handle.

FIG. 6 is a partially exploded perspective view centering on a drive shaft.

FIG. 7 is a schematic vertical cross-sectional view centered on the drive shaft at a push-in position of the operation handle.

[Explanation of symbols]

 10 Seat belt through guide structure 12 Through guide 14 Seat back 16 Seat belt 16a Shoulder belt 18 Seat (assist seat) 32 Operating handle 36 Drive shaft 38 First transmission pulley (sprocket) 42 First connecting strip (endless chain) ) 44 Second connection strip (endless chain) 46 Slider 48 Guide rail 70 Second transmission pulley (sprocket) 90 Biasing means (compression coil spring) 92 Spline joint (stop)

Claims (6)

[Claims] 1. A drive shaft having an operation handle at one end, which is movable in the axial direction with respect to the first and second transmission pulleys, and rotatable integrally with each transmission pulley via a detent. A through guide that is supported and supports the upper end of the shoulder belt of the seat belt is provided so as to be able to move up and down on either the side surface or the front surface of the seat back shoulder portion, and the first transmission pulley is provided on the reclining device and the second reclining device. Is connected to the through guide via the corresponding first and second connecting strips, and the first transmission pulley is connected to the drive shaft at either the pull-out position or the push-in position of the drive shaft. On the other hand, the through guide is independently moved in the vertical direction by rotating the operation handle at that position, and at the other position of the drive shaft, the first and second transmissions are moved. The moving pulley
Both of them are rotatably connected integrally with the drive shaft by the engagement of the detent, and the through guide is interlocked with the swing of the seat back accompanying the operation of the reclining device by the rotation operation of the operation handle at that position. Seat belt through guide structure that moves in the corresponding direction. 2. The through guide structure for a seat belt according to claim 1, wherein the operation handle is provided on either side of the seat cushion. 3. The drive shaft is biased in the pulling-out position direction under the biasing force of the biasing means, and the drive shaft is pushed against the biasing force to prevent the detent between the first transmission pulley and the drive shaft. The through guide structure for a seat belt according to claim 1, wherein the engagement is released. 4. The slider is supported along a guide rail so as to be capable of moving up and down within a predetermined range, and the through guide and a part of the second connecting strip are attached to the slider, respectively, and are associated with a rotating operation of an operating handle. 4. The through guide structure for a seat belt according to claim 1, wherein the through guide moves up and down with respect to the seat back along the guide rail by the rotational movement of the second connecting strip. 5. The spline joint is provided as a detent between the drive shaft and the first and second transmission pulleys.
Seat belt through guide structure according to any one of the above. 6. The first and second connecting strips are respectively formed from an endless chain, and the first and second connecting strips are formed.
6. The seat belt through guide structure according to claim 1, wherein each of the transmission pulleys is formed of a sprocket corresponding to an endless chain.