JPH02256544A - Seat belt for vehicle - Google Patents

Abstract

PURPOSE:To reduce the load applied onto a supporting structure by press- attaching a shift side supporting member onto a fixed side supporting member when an excessive tension is applied onto a seat belt in the collision of a vehicle and by restricting the tension of the seat belt by utilizing a frictional force. CONSTITUTION:In the ordinary pulling-out or winding back, a seat belt 6 passes through a gap A between the upper edge horizontal parts 8a and 9a of the main and sub guide frames and freely shifts, slide-contacting these parts 8a and 9a. When a large load is applied onto the seat belt 6 in the collision of the vehicle, the bending rigidity due to the tension T applied onto the front part of a seat back 1 is less than the compression rigidity due to the tension (t) applied in the taking-up direction of the seat belt 6, and one horizontal part 9a approaches the other horizontal part 8a, and the gap A reduces to the gap B, and the seat belt 6 is press-attached between the horizontal parts 8a and 9a. Therefore, the tension of the seat belt 6 is restricted, and the load applied onto a supporting structure body is reduced.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a vehicular seat belt.

[Prior art]

Seat belts are installed in automobiles to protect passengers. In recent years, in order to improve the occupant protection performance of seatbelts and seatbelt operability, a structure in which seatbelt support points are built into the seat has been considered, but due to the high tension applied to the seatbelt, the seat frame must have high rigidity. is required.

Therefore, the increased weight of the seat is a factor that prevents the realization of such a seat belt system.

A seat winding device having an emergency locking function is attached to the seat cushion frame by winding up one end of the seat belt. A vehicle seat belt is folded upward, passed through the back of the seat back, guided to a shoulder belt support at the upper end of the seat back, and extended from the shoulder belt support to be attached to and detached from a cushion frame. , for example, is known from Japanese Utility Model Application Publication No. 53-10923. In this seat belt, as shown in FIG. 8, at the shoulder belt support portion, the seat belt 14 is folded back from below to the front of the seat by the shoulder belt guide 13.

With this type of conventional seat, the i
In an emergency, when an excessive load is applied to the seatbelt 14 (see Fig. 8), a tension T acts on the seatbelt 14, and the belt guide 13 receives a forward load T and a downward load due to the seatbelt tension T. A load T will be applied. Therefore, the seat back frame needs to have enough rigidity to withstand the resultant force of the loads T in these two directions. Furthermore, since the seat bell (14) is folded back and routed from the bottom of the seat cushion to the back of the seat back by the seat cushion frame, the rear end of the seat cushion frame is also subjected to loads in two directions due to the tension of the seat belt (14). Since the resultant force of T acts, rigidity that can withstand this resultant force is required. Therefore, in order to ensure the necessary rigidity of the seat back frame and the seat cushion frame, the weight must increase, making it difficult to put them into practical use.

[Problem to be solved by the invention]

The present invention solves the above conventional problems, has a simple structure, and limits the tension of the seat belt even when a large load is applied to the seat belt and the seat belt support during a vehicle collision.
An object of the present invention is to provide a seat belt having a structure that can reduce the load applied to a seat belt support structure.

[Means to solve problems]

The present invention solves the above problem by moving a part of a plurality of support parts that support a seat belt by a seat at least one fixed support member and a movable part arranged at a distance from the fixed support member. a seatbelt is passed between the fixed support member and the movable support member, and is guided back and forth between the movable support member and the fixed support member; The present invention is solved by a vehicle seat belt characterized in that when excessive tension is applied to the belt, the movable support member is pressed against the fixed support member by the seat belt, and the tension of the seat belt is limited by frictional force. did.

[Effect]

According to the present invention, the seat belt is guided between fixed support members arranged at a distance from each other and a movable support member and folded back at each support member. At this time, the seat belt is freely pulled out between the fixed support member and the movable support member and is wound up. When an excessive load is applied to the seatbelt, such as during a collision, the seatbelt applies force to the movable support member at the folded portion, presses the movable support member against the fixed support member, and connects the seatbelt to the movable support member. Sandwiched between the fixed support members, the tension applied to the seat belt is limited at the intermediate portion.

〔Example〕

The details of the present invention will be explained based on embodiments shown in the drawings.

In FIG. 1, a seat back frame 3 that supports a seat back 1 is rotatably supported by a seat frame 4 that supports a seat cushion 2, so that the angle of the seat back can be adjusted.

An upper rail fixed to the seat frame 4 of the vehicle is supported by a lower rail so as to be slidable back and forth, and the lower rail is fixed to the vehicle floor panel by a mounting bracket.

A belt winding device that winds up one end of the seat belt 6 and has an emergency lock function! 5 is the seat cushion 2
is arranged at the bottom of the seat frame 4 and fixed to the seat frame 4.

Seat belt 6 pulled out from the belt winding device 5
extends below the seat cushion 2 and connects the seat frame 4
It is folded back upward at the rear end, passes through the back of the seat back frame 3, is guided to the shoulder belt support part 7 at the upper end of the seat back frame 3, and is guided to the shoulder belt support part 7 at the upper end of the seat back frame 3.
One end of the seat belt that stretches out is located at a lower support point 26 on the same side of the seat frame 4 as the shoulder belt support portion 7.
mounted on. A buckle 24 is slidably attached to an intermediate portion between the shoulder belt support portion 7 of the seat belt 6 and a lower support point 26 provided by the seat frame 4;
The buckle 24 can be attached to and detached from an attachment/detachment device 25. The attachment/detachment device 25 is fixed to the seat frame 4 on the opposite side of the seat cushion 2 from the lower support point 26 . A shoulder belt portion 6a is formed between the shoulder belt support portion 7 and the buckle 24 of the seat belt.

As shown in FIGS. 2 and 3, the shoulder belt support portion 7 as one of the seat belt support portions is connected to a main guide frame 8 as a fixed support member welded to the upper end of the seat back frame 3. It has a sub-guide frame 9 as a moving support member. The main guide frame 8 is formed by bending the vibrator into a gate shape.

As shown in FIG. 4, the upper horizontal part 9a of the sub-guide frame 9 is located below and behind the upper horizontal part 8a of the main guide frame 8, and the upper horizontal part 8a of the main guide frame and the upper horizontal part 9a of the sub-guide frame The relative positions of the main guide frame 8 and the sub guide frame 9 are set so that a slight gap A is maintained between them. The seat belt 6, which is routed around the back of the seat back 1, passes through the upper surface of the upper horizontal portion 9a of the sub-guide frame, passes through the gap A, and passes through the lower surface of the upper horizontal portion 8a of the main guide frame.
The seat back 1 is pulled out in front. As shown in FIG. 2, a guide plate 10 is fixed to the upper horizontal portion 9a of the sub-guide frame by screws 11 and 12.
The seat belt 6 extending along the back of the seat back 1 is
It is held between the upper end horizontal portion 9a of the sub-guide frame so as not to shift in the left-right direction.

When the occupant pulls out the seat belt 6, the seat belt 6 passes through the gap A between the main guide frame upper horizontal part 8a and the sub guide frame upper horizontal part 9a.
The drawer is pulled out and rewound while sliding on each of the main guide frame upper end horizontal portion 8a and the sub guide frame upper end horizontal portion 9a.

When a large load is applied to the seatbelt dowel 6 during a vehicle collision, etc., the sub-guide frame 9 has a tensile force applied to the front of the seatback l compared to the compressive rigidity due to the tension t applied in the winding direction of the seatbelt 6. Since the bending rigidity due to the T is low, when the initial tension is first applied to the seat belt 6, the sub-guide frame upper horizontal portion 9a moves elastically due to bending of the sub-guide frame 9, and the upper horizontal portion 9a of the sub-guide frame bends to the upper horizontal portion 8a of the main guide frame. As shown in Figure 5,
The gap A is reduced to the gap B, and the seat belt 6 is pressed between the upper horizontal portion 8a of the main guide frame and the upper horizontal portion 9a of the sub-guide frame. When the tension T increases to a predetermined strength, it primarily acts as a tension force that pulls the seatback l forward due to the frictional force caused by the pressure bond between the main guide frame upper horizontal part 8a and the sub guide frame upper horizontal part 9a, The tension t of the seat belt 6 applied below the shoulder belt support portion 7 has a very small value compared to the tension T.

Even when the belt elongation is regulated by the locking means of the belt winding device 5 below the initial tension, when the load increases because the occupant tries to move forward, the shoulder belt support section 7 performs the same operation as described above. It becomes locked.

In another embodiment shown in FIGS. 7 and 8, the shoulder belt support 7 includes two seat belt anchor frames 15 and 16 fixed to the upper end of the seat back frame 3, and the seat belt anchor 15 and the seat belt. Two mutually parallel guide bars fixed at both ends to the anchor frame 16, namely an upper guide bar 17 as a fixed support member and a lower guide bar 18 as a fixed support member.
and has. The seat belt anchor frame 1 is disposed between the upper guide bar 17 and the lower guide bar 18.
Elongated holes 20 extending in the seat front and rear direction formed in 5 and 16
A movable guide bar 19 is provided as a movable support member that slidably engages with the movable guide bar 19 .

At both ends of the movable guide bar 19, springs 21 and 22 are installed.
One end of the springs 21, 22 is locked, and the other ends of the springs 21, 22 are locked to the seat belt anchor frames 15 and 16, respectively. Due to the action of the springs 21, 22, the movable guide bar 19 is pulled in front of the seat. A seat belt 23 (in place of the seat belt 6 in the embodiment shown in FIG. 1) that is routed around the back of the seat back 1 is passed between the lower guide bar 18 and the movable guide bar 19, and is guided along the movable guide bar 19. It is folded back, passed between the movable guide bar 19 and the upper guide bar 17, folded back along the upper guide bar 17, and pulled out in front of the seat.

When the occupant operates the seat belt 23, the movable guide bar 19 is pulled forward of the seat by the springs 21, 22, and a gap is secured between the movable guide bar 19, the upper guide bar 17, and the lower guide bar 18. Therefore, the seat belt 23 can slide and move on the outer circumferences of the lower guide bar 18, the movable guide bar 19, and the upper guide bar 17, and the seat belt 23 can be pulled out and retracted.

When an excessive load is applied to the seat belt 23 in an emergency such as a vehicle collision, the initial tension applied to the seat belt 23 causes the movable guide bar 19 to be pulled and moved toward the rear of the seat against the force of the spring 2122. , the upper guide bar 17 and the lower guide bar 18 with the seat belt 23 sandwiched between them.
is crimped. At this time, due to the frictional force generated through the seat belt 23 between the movable guide bar 19, the upper guide bar 17, and the lower guide bar 18, an excessive initial tension of more than a certain initial tension is applied to the seat belt 23 on the back of the seat back l. Prevent tension from being applied.

In the example shown in Figure 1, the seatbelt retractor is located below the seat cushion, while the seatback
It can also be configured to be placed inside.

〔effect〕

According to the present invention, the load applied to the seat belt is locked by the shoulder belt support, so it is possible to reduce the load applied to each support point of the seat belt, and it is desired to increase the rigidity of the seat frame more than necessary. This made it possible to create a lightweight and space-saving seat frame structure.

According to the present invention, even if the folded portion of the seatbelt increases due to seatbelt routing, the rigidity of the folded portion of the seatbelt can be reduced, increasing the degree of freedom in seatbelt routing and the installation location of the seatbelt retractor. It was possible to increase the degree of freedom of

According to the present invention, regardless of the installation location of the seatbelt retractor and the way the seatbelt is routed, the support point, which is the restraint point of the seatbelt, is located close to the upper body of the occupant.
It was possible to prevent a decrease in the ability to restrain the occupant due to seat belt stretching.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a vehicle seat according to the present invention, FIG. 2 is a front perspective view of a shoulder belt support, FIG. 3 is a rear perspective view of a shoulder belt support, and FIG. 4 is a perspective view of a shoulder belt support. 5 is a side sectional view of the shoulder belt support section showing the state when a large tension is applied to the seat belt; FIG. 6 is a front perspective view of the shoulder belt support section of another embodiment; FIG. 7 is a side sectional view of FIG. 6, and FIG. 8 is a side sectional view of the conventional shoulder belt support. In the figure, 1... Seat back 2... Seat cushion 3... Seat pack frame 4... Seat frame 5... Seat belt retractor 6... Seat belt 6a... Shoulder belt 7... Shoulder belt support part 8... Main guide frame 8a... Main guide frame upper end horizontal part 9... Sub guide frame 9a... Sub guide frame upper end horizontal part 10... Guide frame 11. ...Screw 12...Screw 13...Shoulder belt guide 14...Seat belt 15...Shoulder belt anchor frame 16...
・Shoulder belt anchor frame 17... Upper guide bar 18... Lower guide bar 19... Movable guide bar 20... Length 21.22... Spring 23... Seat belt 24... Buckle 25 ... Detachment device 26 ... Support point agent Patent attorney Hideaki Kuwahara Figure 7

Claims (1)

[Claims] Some of the plurality of supports supporting the seat belt by the seat include at least one fixed support member and a movable support member spaced apart from the fixed support member, When a belt is passed between the fixed support member and the movable support member, is folded back and guided by the movable support member and the fixed support member, and excessive tension is applied to the seat belt. A vehicular seat belt, wherein the movable support member is pressed against the fixed support member by the seat belt, and the tension of the seat belt is limited by frictional force.