JPS63270263A - Seat belt for car - Google Patents

Abstract

PURPOSE:To allow a seat belt to work with its proper function at the time of collision and increase the angle of opening of the rear door after collision by locking or unlocking displacement of a belt guide in the acting direction of the friction force between the seat belt and belt guide. CONSTITUTION:In normal service condition, a belt guide 26 is located in the set position on the cabin side by the pressure of a lief spring. At the time of collision, the driver (passenger) B pulls the seat belt 14 ahead, and the belt guide 26 is locked receiving the pulling force by the friction force, and the seat belt 14 works with its proper function of protecting the driver. When a passenger at the rear seat begins opening the rear door 20 after collision, the seat belt 14 is pulled backward and the belt guide 26 is unlocked through the action of the backward to outside the car is applied to the belt guide 26 to cause displacement to the set position outside the car, and the angle of opening of the rear door 20 can be increased.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a seat belt device for an automobile.

(Prior art) Some automobile seat belt devices include
As seen in Japanese Patent No. 1959, there is a seat back in which a belt guide is provided in order to improve the usability of the seat belt. In this type of automobile seat belt device, the seat belt passing through the belt guide is wound up by a retractor.

By the way, regarding the layout, the following problems arise when the retractor is disposed on the rear seat door. That is, since the retractor is designed to lock and fix the seatbelt in the event of a collision, there is a risk that the opening angle of the rear seat door will be restricted by the seatbelt in the event of a collision, making it impossible to open it wide.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a seat belt necking system for an automobile that does not affect the opening angle of the rear seat door even when the retractor is locked.

(Means and operations for solving the problem) The present invention was made by focusing on the direction of action of the frictional force between the seat belt and the belt guide when the retractor is locked in the event of a collision. .

That is, the present invention is based on an automobile seat belt device in which a belt guide is disposed on the seat back of a front seat, and a seat belt passing through the belt guide is wound up by a retractor. is provided on the rear seat door, and the belt guide is movable between a set position located on the inside of the vehicle and a seat release position located on the outside of the vehicle. locking means for locking the displacement of the belt guide when friction with the belt acts toward the rear of the vehicle body; lock release means for unlocking the belt guide when the friction acts toward the front of the vehicle body; ■Applying means for urging the belt guide toward the inside of the vehicle;
It has a configuration like this.

With this configuration, first, during normal use, the belt guide is placed at a set position inside the vehicle by the biasing means.

In the event of a collision, the retractor locks as described above, creating tension in the seatbelt, and this tension exerts the occupant protection function. By the way, at the time of this collision, the seat belt is pulled forward by the occupant, so a frictional force is generated between the belt guide and the seat belt toward the rear of the vehicle body.

As a result, the belt guide receives a forward pulling force from the occupant and is locked. On the other hand, when the rear seat occupant begins to open the rear seat door during a collision, the seat belt is pulled rearward by the opening movement of the rear seat door, so there is a gap between the belt guide and the seat belt at the front of the vehicle. Frictional force will be generated towards the As a result, a rearward tensile force is applied to the belt guide due to the opening movement of the rear seat door, and the belt guide is unlocked in response to this force. Also, at this time, the belt guide has
Since a force is applied in the direction outside the vehicle due to the opening movement of the rear seat door, the belt guide is displaced to the set release position on the outside of the vehicle, and this displacement of the belt guide in the direction outside the vehicle increases the opening angle of the rear seat door. It will be done.

(￥male side) Embodiments of the present invention will be described below based on the drawings.

In FIGS. 2 and 3, reference numeral 10 is inside an automobile, and a seat belt 14 is installed on a front seat 12 of the vehicle. The seat belt 14 is of a so-called three-point type, consisting of a waist belt 14a and a shoulder belt 14b, and is inserted into a buckle 16 fixed on the interior side when in use.

The shoulder belt 14b is connected at its base end to a retractor 18 and is wound up by the retractor 18. The retractor 18 is disposed inside the front-hinged rear seat door 20, and the shoulder belt 14b extending from the retractor 18 is attached to an opening 2 that opens at the upper edge of the rear seat door 20.
2 into the vehicle interior 10, and passes through the vehicle-outside shoulder portion 24a of the seat back 24 in the front seat. A belt guide 2 is attached to the shoulder portion 24a of the seat back 24 on the outside of the vehicle.
6 is arranged, and the shoulder bell h1 is disposed on this belt guide 26.
4b is inserted. The relative positional relationship between the belt guide 26 and the retractor 18, more specifically, the relative positional relationship between the belt guide 26 and the opening 22, is as shown in FIG. The positional relationship is such that an obtuse angle θ is formed on the outside of the vehicle. That is, the retractor 18 (opening 22)
is provided at the front end of the rear seat door 20.

As shown in FIG. 1, the belt guide 26 is generally composed of a base 30 fixed to the seat back 24 and a guide portion 32 movable in the vehicle width direction with respect to the base 30. has been done.

The L base 30 is made of a hollow box body, and a guide hole 34 extending in the vehicle width direction is formed in the upper wall of the base 30, and a bottom inner wall surface 30a
is an arcuate surface that is convex downward in the longitudinal section. Furthermore, locking teeth 36 extending in the vehicle width direction are fixedly provided on the side wall surface 30b on the rear side of the vehicle body.

- The guide portion 32 has a belt insertion hole 38 at its upper end.
The lower end surface 38a of the belt insertion hole 38 is formed into an upwardly convex arcuate surface in order to increase the contact surface with the shoulder belt 14b as much as possible. On the other hand, the lower end portion of the guide portion 32 is a base portion 40, and the base portion 40 has a bottom surface 4.
0a is an arcuate surface corresponding to the bottom inner wall surface 30a of the base 30, and 1 is a circular arc surface corresponding to the bottom inner wall surface 30a of the base 30, and
-1, meshing teeth 42 and leaf springs 44 extending in the vehicle width direction are arranged vertically. Such a guide part 32 is assembled by housing the base part 40 in the base 30 with the inner end wall 30c of the base 30 removed, and then the side wall 30c is assembled with bolts and nuts (not shown). It can be assembled to the main body of the base 30 by using. Furthermore, the outer end wall 30d of the base 30 and the base portion 4
A compression spring 46 is interposed between the compression spring 4 and
6 urges the guide portion 32 toward the interior of the vehicle.

In the above configuration, during normal use, the meshing teeth 42 and the locking teeth 36 are not engaged with each other due to the urging force of the leaf spring 44, so that the guide portion 34 can be freely displaced in the vehicle width direction. At the same time, it is positioned at the inward stroke end (set position) by the biasing force of the compression spring 46.

In the event of a collision, while the retractor 18 is locked, a tensile force T is generated in the forward direction on the shoulder belt 14b by the occupant B, and this shoulder belt! 4b and the belt insertion hole 38, a frictional force f toward the rear of the vehicle body is generated (see FIG. 4). As a result, belt guide 2
6, the guide part 32 is tilted forward by the forward tensile force T, and the meshing teeth 42 mesh with the locking teeth 36 against the leaf spring 44, so that the guide part 32 is locked at the set position. As a result, the belt guide 26 (guide portion 32) remains stationary at the set position, and the original function of the shoulder belt 14b, that is, the occupant protection function is performed.

On the other hand, when the rear seat occupant begins to open the rear seat door 20 after the collision, a rearward pulling force T is applied to the shoulder belt 14b.
This causes a frictional force f toward the front of the vehicle body to be generated between the shoulder belt 14b and the belt insertion hole 38 (see FIG. 5).

As a result, in the belt guide 26, the guide portion 32 is tilted rearward due to the rearward tensile force T, and the engagement between the meshing teeth 42 and the locking teeth 36 is released. At this time, the belt guide 26 (
As shown in FIG.
Since the component force F of the tension T acting on 4b is acting in the direction outside the vehicle, the guide portion 32 is displaced in the direction outside the vehicle to its stroke end (set release position), and this guide portion 3
By the displacement 2, the rear seat door 20 can be opened wide by the displacement.

The drawings after FIG. 7 show other embodiments of the present invention, and explanations of elements that perform the same functions as those of the first embodiment are omitted, and the characteristic parts of each embodiment are described below. I will only add an explanation.

7 and 8 show a second embodiment of the present invention. In this embodiment, the guide portion 32 is swingable in the vehicle width direction and can take a set position and a set release position. It is like that. That is, the belt guide 26 has a guide portion 32 having a plate-like shape extending in the vertical direction, a belt insertion hole 38 is provided at the upper end thereof, and a mesh @ 42 is provided on the rear side plate surface of the vehicle body at the lower end. The intermediate portion thereof is attached to the base portion 40 via a spherical joint 50. The base 30 has stoppers 52.54 provided at intervals in the vehicle width direction, and the stoppers 52.54 restrict the swing range of the guide portion 32 in the vehicle width direction. .

A tension spring 56 is interposed between the base 30 and the guide section 32, and the guide section 32 is biased toward the set position by the spring 56.

In the above configuration, the guide part 32 is made swingable in the longitudinal direction of the vehicle body by the spherical joint 50. Similarly to the first embodiment, in the event of a collision, the guide part 32 tilts forward and engages with the meshing teeth 42. The stop tooth 36 meshes with the stop tooth 36, and as a result, the guide portion 3
2 is locked in the set position. On the other hand, when the rear seat door 20 begins to open after the collision, the guide portion 32 tilts backward, the meshing teeth 42 and the locking teeth 36 are disengaged, and the component force F moves the guide portion 32 to the set release position. It will be displaced to.

9 and 10 show a third embodiment of the present invention. In this embodiment, a rod 60 extending substantially in the vehicle width direction is integrally provided with the guide portion 32, and the rod 60 is fitted and housed in the cylinder 62. The cylinder 60 is fixed to the shoulder 24a of the seat back 24.
A piston 64 is fitted into the inside of the piston 6.
4 defines two chambers inside the cylinder 62: a vehicle outer chamber 66 and a vehicle inner chamber 68.
is filled with oil. The piston 64 is rotatably attached to the rod 60.
A locking pin 70 is loosely inserted into the rod 4, and the locking pin 70 is arranged in parallel with the rod 60, and its end is fixed to the cylinder wall. The piston 64 is also provided with an orifice 72 that communicates with the two chambers 66 and 68, while a closing plate 74 is fixedly provided in the rod and drawer 0 in opposition to the orifice 72. This piston 32 is supported by a compression spring 76 disposed in the vehicle outer chamber 66.
(note that the illustration is omitted in FIG. 9).

In the above configuration, in the event of a collision, the guide portion 32 rotates in the direction of the arrow shown in the figure around the axis of the rod 60, and the closing plate 3
4 closes the orifice 72 and locks the displacement of the guide portion 32 in the vehicle width direction. On the other hand, when the rear seat door 20 begins to open, the guide portion 32 is reversed and the orifice 7 is opened.
2 is opened, and the guide portion 32 is unlocked.

(Effects of the Invention) As is clear from the above description, the present invention has the following advantages:
Because the displacement of the belt guide is locked or unlocked, the seat belt functions in the event of a collision.
On the other hand, after a collision, the restraint of the rear seat door by the seat belt is relaxed, so the opening angle of the rear seat door can be increased.

[Brief explanation of drawings]

Figures 1 to 6 show a first embodiment of the present invention. Figure 1 is an exploded perspective view, Figure 2 is a layout diagram of the seat belt device, and Figure 3 is a view of the seat belt device from inside the vehicle. FIG. 4 is an explanatory diagram of the operation at the time of a collision, FIG. 5 is an explanatory diagram of the operation when the rear seat door is opened, and FIG. 6 is a conceptual front view of the seat belt device. 7 is an overall perspective view showing a second embodiment of the present invention, FIG. 8 is a sectional view taken along the line ■-■ in FIG. 7, FIG. 9 is an overall perspective view showing a third embodiment of the invention, FIG. 10 is a sectional view taken along the line X--X in FIG. 9. 12: Front seat 14: Seat belt 14b: Shoulder belt 18: Retractor 20: Rear seat door 24 Niji-do pack 26: Belt guide 30: Base 32 Ni guide portion 36: Locking teeth 40: Base portion 42: Engaging teeth 46: Compression spring Fig. 8 Fig. 10 μs

Claims (1)

[Claims] (1) A belt guide is installed on the seatback of the front seat,
A seat belt device for an automobile in which a seat belt passing through the belt guide is retracted by a retractor, wherein the retractor is provided at a rear seat door, and the belt guide is located at a set position on the inside of the vehicle and at a set position on the outside of the vehicle. The belt guide includes a locking means that locks the displacement of the belt guide when friction with the seat belt acts toward the rear of the vehicle; An automobile characterized in that the vehicle is provided with lock release means for unlocking the belt guide when the belt guide acts toward the front of the vehicle body, and urging means for urging the belt guide toward the inside of the vehicle. seat belt device.