JP2012171395A - Seat belt tightening force-relaxing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat belt tightening force-relaxing device having a simple structure to be easily handled and capable of reducing an oppressive feeling given to an occupant by the seat belt.SOLUTION: The seat belt tightening force-relaxing device has: a plate like body 2 arranged between the occupant P and a webbing W when the seat belt is fitted; and an envelope 3 for wrapping the plate like body 2 and the webbing W, wherein the plate like body 2 is arranged in both ends and has a first holding part 21 held by a shoulder anchor 12 and a second holding part 22 held by a tongue 15, and is configured to relax the tightening force T loaded on the occupant P due to the tension of the webbing W by allowing a part of the seat belt device to hold the first holding part 21 and the second holding part 22 to use the counter force F of the plate like body 2.

Description

  The present invention relates to a seat belt tightening force alleviating device that is attached to a webbing of a seat belt device, and more particularly, to a seat belt tightening force mitigating device that can reduce a feeling of pressure given to an occupant by the seat belt device.

  2. Description of the Related Art A vehicle such as an automobile is generally provided with a three-point seat belt device that restrains an occupant on a seat that includes a seat portion on which the occupant sits and a backrest portion that is positioned on the back of the occupant. Such a seat belt device includes a webbing for restraining an occupant, a seat belt retractor for winding the webbing, a guide anchor or a shoulder anchor for guiding the webbing, a belt anchor for fixing the webbing to the vehicle body side, and a seat. A buckle disposed on a side surface and a tongue disposed on the webbing are provided, and the occupant is restrained by the webbing by fitting the tongue to the buckle.

  The webbing includes a shoulder portion spanned between the guide anchor or the shoulder anchor and the buckle and a lap portion spanned between the buckle and the belt anchor when the seat belt is mounted. The chest part of the occupant is mainly restrained by the shoulder part, and the waist part of the occupant is restrained by the wrap part.

  In such a seat belt device, there is a problem that the occupant feels uncomfortable because the tightening force generated by the tension of the webbing gives the occupant an excessive feeling of pressure. Particularly, the webbing of the shoulder part is easy to feel a sense of pressure because it restrains the chest of the occupant, and moreover, the sense of pressure is more easily felt because the chest of the occupant often moves back and forth. Therefore, various devices and methods have been proposed for eliminating the discomfort that the seat belt device gives to the occupant.

  For example, in the seat belt tension adjusting device described in Patent Document 1, the webbing is performed by pressing the roller B against the webbing, sandwiching the webbing with the roller A, and rotating the roller A under the control of the control means. One mechanism makes it possible to draw out slack or to take up and remove the slack of webbing. According to such a seat belt tension adjusting device, by pulling out the webbing by a predetermined amount when the seatbelt is worn, the webbing can be slackened and the feeling of pressure on the body can be eliminated.

  In addition, the tension reducing device for a seat belt described in Patent Document 2 includes a connecting member that is detachably attached to a turnbuckle attached to the interior of the vehicle and a guide member through which the seat belt is slidably inserted. Features. According to such a tension relief device, the end of the tension relief device is positioned immediately before the shoulder of the occupant when the seat belt is worn, and the seat belt is linearly extended downward from the end of the seat belt. A slight gap is formed between the chest and the chest.

JP-A-6-270761 JP 2000-185626 A

  However, the apparatus described in Patent Document 1 has a problem that the amount of webbing to be taken up in an emergency such as a vehicle collision increases because the webbing is pulled out to create a slack. In addition, in order to pull out the webbing according to the body shape of the occupant and the tension of the webbing, there is a problem that a sensor for detecting them is required and the cost is increased.

  Further, in the apparatus described in Patent Document 2, since the guide member is connected to the turnbuckle in the vehicle and the guide member is exposed in the vehicle, it may come into contact with an occupant or enter the field of view. The problem was that the passengers felt uncomfortable.

  The present invention was devised in view of the above-described problems, and provides a seat belt tightening force alleviating device that is easy to handle with a simple structure and that can reduce the feeling of pressure given to an occupant by the seat belt device. With the goal.

  According to the present invention, there is provided a seat belt tightening force alleviating device that is mounted on a webbing of a seat belt device that restrains an occupant, and a plate-like body that is disposed between the occupant and the webbing when the seat belt is mounted. The plate-like body and an envelope that wraps the webbing, and the plate-like body has a holding portion that is disposed at one end or both ends and is held by a part of the vehicle, and the holding portion is the seat. A seat belt tightening force characterized by relieving a tightening force applied to the occupant by a tension of the webbing by using a reaction force of the plate-like body by being held by a part of the belt device A mitigation device is provided.

  The holding portion is held, for example, by being brought into contact with or engaging with a part of the seat belt device. In the present invention, “locking” means connecting or fixing the holding portion and a part of the seat belt device, and includes connecting, connecting, fixing, engaging, fitting, fitting, and the like. It is a purpose to include.

  Moreover, the said holding | maintenance part is hold | maintained at the tongue of the said seatbelt apparatus, a shoulder anchor, or a guide anchor, for example. The tongue, shoulder anchor, or guide anchor is merely an example of a part of the seat belt device, and is not limited thereto.

  The plate-like body has, for example, a length that is arranged from the shoulder to the waist or from the shoulder to the chest region of the occupant. The plate-like body may have a width larger than the width of the webbing.

  The envelope may include a fastener for enclosing and restraining the plate-like body and the webbing.

  According to the above-described seat belt tightening force alleviating device according to the present invention, the plate-like body is arranged between the occupant and the webbing when the seat belt is worn, and the plate-like body and the webbing are integrated by the envelope and the plate By simply holding the holding part of the belt-like body part of the seat belt device, the plate-like body can be bent to generate a reaction force that opposes the tightening force applied to the passenger by the tension of the webbing. The tightening force applied to the vehicle can be relaxed, it is easy to handle with a simple structure, and the feeling of pressure given to the occupant by the seat belt device can be reduced.

  By setting the holding portion to an abutting structure or a locking structure, the holding portion can be easily held on a part of the seat belt device. Further, by holding the holding portion on the tongue, shoulder anchor or guide anchor, the holding portion can be easily held on a part of the seat belt device.

  By forming the plate-like body to a length that extends over the region from the shoulder to the waist of the passenger, the seat belt device can easily hold the holding portions arranged at both ends of the plate-like body. The entire shoulder portion of the webbing can effectively reduce the feeling of pressure applied from the shoulder portion of the occupant to the waist. Also, the plate-like body is formed to have a length that is arranged over the region from the shoulder to the chest of the occupant, thereby holding the holding portion arranged at one end of the plate-like body on the seat belt device at the shoulder of the occupant. By doing so, it is possible to effectively reduce the feeling of pressure applied from the shoulder portion of the occupant to the chest by the shoulder portion of the webbing.

  By forming the width of the plate-like body larger than the width of the webbing, the side portion of the webbing can be prevented from directly applying a tightening force to the occupant, and is given to the occupant by the seat belt device. The feeling of pressure can be effectively reduced.

  By disposing the fastener in the envelope, the envelope can be opened and closed. With the fastener open, the plate-like body and webbing are directed to the envelope, and by closing the fastener, the plate-like body and webbing are wrapped together in the envelope. And the displacement of the plate-like body during use can be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the seatbelt clamping force relaxation apparatus which concerns on 1st embodiment of this invention, (A) is a perspective view of the state which opened the envelope, (B) is sectional drawing of the state which closed the envelope, (C ) Is a cross-sectional view showing a modification of the envelope. It is a figure which shows the use condition of the seatbelt clamping force relaxation apparatus shown in FIG. 1, (A) is a front view, (B) is a conceptual diagram for demonstrating an effect. It is an enlarged view which shows the holding | maintenance part of the seatbelt clamping force relaxation apparatus shown in FIG. 1, (A) has shown the 1st holding | maintenance part and (B) has shown the 2nd holding | maintenance part. It is a conceptual diagram which shows the seatbelt clamping force relaxation apparatus which concerns on other embodiment of this invention, (A) has shown 2nd embodiment, (B) has shown 3rd embodiment. It is a figure which shows the modification of a holding | maintenance part, (A) is a 1st modification, (B) is a 2nd modification, (C) has shown the 3rd modification. It is a figure which shows the seatbelt clamping force relaxation apparatus which concerns on 4th embodiment of this invention, (A) is a front view in use condition, (B) is a perspective view of the state which opened the envelope.

  Hereinafter, a seat belt tightening force alleviating device according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 3. Here, FIG. 1 is a view showing the seat belt tightening force alleviating device according to the first embodiment of the present invention, in which (A) is a perspective view with an envelope opened, and (B) is with the envelope closed. Sectional drawing of a state, (C) is sectional drawing which shows the modification of an envelope. 2A and 2B are diagrams showing a use state of the seat belt tightening force alleviating device shown in FIG. 1, wherein FIG. 2A is a front view and FIG. 2B is a conceptual diagram for explaining the effect. 3 is an enlarged view showing a holding portion of the seat belt tightening force alleviating device shown in FIG. 1, in which (A) shows a first holding portion and (B) shows a second holding portion.

  As shown in FIGS. 1 to 3, the seat belt tightening force alleviating device 1 according to the first embodiment of the present invention relaxes the seat belt tightening force that is attached to the webbing W of the seat belt device that restrains the occupant P. The apparatus includes a plate-like body 2 disposed between the occupant P and the webbing W when the seat belt is mounted, and an envelope 3 that wraps the plate-like body 2 and the webbing W. The first holding part 21 is disposed at both ends and is held by the shoulder anchor 12 and the second holding part 22 is held by the tongue 15, and the first holding part 21 and the second holding part 22 are connected to the seat belt device. By holding a part (here, the shoulder anchor 12 and the tongue 15), the tightening force T applied to the occupant P due to the tension of the webbing W is relieved using the reaction force F of the plate-like body 2. It is configured.

  The seat belt device illustrated in FIG. 2A illustrates a case where the seat belt device is disposed in a single seat S (for example, a driver seat or a passenger seat). Such a seat belt device is a so-called three-point seat belt device, and includes a webbing W that restrains the occupant P, a seat belt retractor 11 that winds the webbing W, a shoulder anchor 12 that guides the webbing W, and the webbing W. A belt anchor 13 fixed to the side, a buckle 14 disposed on the side surface of the sheet S, and a tongue 15 disposed on the webbing W are provided. Here, the case where the seat belt retractor 11 is built in the seat S and the shoulder anchor 12 is arranged in front of the shoulder opening of the seat S is illustrated, but the seat belt retractor 11 is built in a vehicle body such as a pillar. Alternatively, instead of the shoulder anchor 12, a guide anchor arranged on a vehicle body such as a pillar may be provided. However, it is preferable to change the structure of the 1st holding | maintenance part 21 and the 2nd holding | maintenance part 22 according to the change of the structure of a seatbelt apparatus.

  Although not shown, the seat S may be connected to a plurality of seats like a rear seat. In the case of the seat S having a plurality of seats, seat belt devices for seats are generally installed, and the seat belt tightening force alleviating device 1 according to the present embodiment is arbitrarily attached to each seat belt device. be able to.

  The plate-like body 2 is constituted by a thin flat plate having a width D and a length L, as shown in FIG. The plate-like body 2 has flexibility and is configured to be able to bend by holding the first holding portion 21 and the second holding portion 22 on the seat belt device. Further, in a use state in which the plate-like body 2 is curved, the plate-like body 2 has a rigidity enough to generate a reaction force F that can counter the tightening force T of the webbing W when a normal seat belt is worn. Specifically, the plate-like body 2 is formed of, for example, a synthetic resin such as plastic, a lightweight metal such as aluminum, a composite material, or the like.

  Note that “when the normal seat belt is worn” means a state in which the occupant P is correctly seated on the seat S, pulls out the webbing W, and the tongue 15 is fitted on the buckle 14. This is intended to exclude the case where the occupant P is bent forward or is not facing forward.

  Further, the plate-like body 2 has a width D larger than the width d of the webbing W, as shown in FIG. Thus, by forming the width D of the plate-like body 2 to be larger than the width d of the webbing W, the side portion of the webbing W is detached from the plate-like body 2, and the clamping force is directly applied to the passenger P. T can be prevented from being loaded. Further, when the seat belt tightening force alleviating device 1 is attached to the webbing W, there is a margin in the width direction, so that the plate-like body 2 can be easily applied to the webbing W.

  Moreover, the plate-like body 2 has a length L that is arranged from the shoulder Ps of the occupant P to the waist Pw, as shown in FIG. The length L may be set to different lengths for adult males, adult females, children, etc., and the size according to the size of the chest circumference and abdominal circumference (for example, large, medium, small, etc.) May be set. Alternatively, the plate-like body 2 may be configured to be slidable and extendable so that the length L can be arbitrarily changed. The webbing W is generally divided into a shoulder portion Ws and a lap portion Wl when the seat belt is worn. That is, the plate-like body 2 has a length L that can be arranged along the shoulder portion Ws of the webbing W.

  By forming the plate-like body 2 to such a length L, the first holding portion 21 and the second holding portion 22 arranged at both ends of the plate-like body 2 can be easily held by the shoulder anchor 12 and the tongue 15. It is possible to reduce the feeling of pressure given to the occupant P by the entire shoulder portion Ws of the webbing W.

  Moreover, as shown to FIG. 1 (A), the 1st holding | maintenance part 21 and the 2nd holding | maintenance part 22 which comprise a holding | maintenance part are arrange | positioned at the both ends of the plate-shaped body 2. FIG. Here, the first holding portion 21 is positioned and held by abutting against the shoulder anchor 12. Further, the second holding portion 22 is positioned and held by being engaged with the tongue 15. That is, the holding portions (the first holding portion 21 and the second holding portion 22) are held by being abutted or locked against a part of the seat belt device (the shoulder anchor 12 and the tongue 15).

  As shown in FIGS. 1A and 3A, the first holding portion 21 includes a pair of abutting portions 21a disposed at both ends in the width direction of the plate-like body 2, and an abutting portion 21a. And a connecting portion 21b that is connected and fixed to the plate-like body 2. The abutting portion 21a may have any shape that protrudes more than the plate-like body 2 and does not easily shift when the abutting portion 21a is abutted against the abutting portion 21a. For example, it is formed in a thick plate shape as shown in the figure, but the tip may be round and pointed, irregularities or grooves for increasing the frictional force may be formed at the tip, May be inserted into the opening 12a of the shoulder anchor 12, or a cushioning material such as a cushion may be disposed at the tip. For example, the connecting portion 21b is formed integrally with the pair of abutting portions 21a, and is connected to the end portion of the plate-like body 2 by fixing means such as rivets, pins, bolts, caulking, and welding.

  As shown in FIGS. 1 (A) and 3 (B), the second holding portion 22 is connected to the gripping portion 22a disposed at a substantially central portion in the width direction of the plate-like body 2 and the gripping portion 22a. And a connecting portion 22b fixed to the plate-like body 2. The gripping portion 22 a may have any shape that protrudes in the length direction from the plate-like body 2 and can be locked to a part of the tongue 15. For example, as shown in the drawing, the gripping portion 22a has a locking groove 22c capable of pushing and locking a part of the tongue 15. The front end side of the locking groove 22c is narrow, and has a space in which a part of the tongue 15 can be inserted on the bottom side. Then, by using the elastic force of the distal end portion of the gripping portion 22a, a part of the tongue 15 is pushed into the locking groove 22c, and the gripping portion 22a is locked to the tongue 15. The connecting portion 22b is formed integrally with the gripping portion 22a, for example, and is connected to the end portion of the plate-like body 2 by fixing means such as rivets, pins, bolts, caulking, and welding. In FIG. 3B, the webbing W is omitted for convenience of explanation.

  The envelope 3 is a component for attaching the plate-like body 2 to the webbing W, and is made of, for example, a woven fabric. Various materials such as velor, velvet, printed woven fabric, and the like can be used as the material of the envelope 3, and the touch can be improved and the appearance can be improved.

  In addition, the envelope 3 includes a fastener 31 for wrapping and restraining the plate-like body 2 and the webbing W as shown in FIG. Specifically, the envelope 3 has a width large enough to wrap the plate-like body 2 and the webbing W, and wraps the plate-like body 2 and the webbing W and folds both ends in the width direction. It has a fastener 31 that can maintain a closed state.

  1A and 1B illustrate the case where the fastener 31 is a surface fastener. The fastener 31 includes, for example, a plurality of male surface fasteners 31a arranged along a line on the outer surface of one end of the envelope 3 (the surface opposite to the surface on which the plate-like body 2 is disposed), and the inner surface of the other end ( And a plurality of female surface fasteners 31b disposed along the line on the surface on which the plate-like body 2 is disposed. Here, the male surface fastener 31a and the female surface fastener 31b are arranged so as to be scattered in the length direction of the envelope 3, but the male surface fastener 31a and the female surface that are long in the entire length direction are disposed. The mold surface fastener 31b may be arranged. The fastener 31 is not limited to a hook-and-loop fastener, and may be a line fastener that engages with teeth lined up on a line, or may be a fastener such as a button.

  The envelope 3 may be configured separately from the plate-like body 2, but is preferably fixed to the plate-like body 2 in consideration of ease of handling. For example, the envelope 3 may be fixed to the plate-like body 2 with an adhesive, or may be fixed to the plate-like body 2 with a fastener such as a rivet or a pin, Holes may be formed at intervals and fixed by sewing with a suture.

  Further, as shown in the modification of FIG. 1C, a cylindrical portion 32 into which the plate-like body 2 can be inserted may be formed in the center portion of the envelope 3. In such a modification, the first holding part 21 and the second holding part 22 may be connected to the plate-like body 2 after the plate-like body 2 is inserted into the cylindrical part 32 of the envelope 3, or the first holding After connecting the part 21 and the second holding part 22 to the plate-like body 2, the plate-like body 2 may be inserted through the cylindrical part 32 of the envelope 3 from the second holding part 22 side.

  The above-described seat belt tightening force alleviating device 1 is attached to the shoulder portion Ws of the webbing W after the occupant P seated on the seat S pulls out the tongue 15 and attaches it to the buckle 14 to attach the seat belt. Specifically, with the fastener 31 open, the plate-like body 2 is disposed between the webbing W and the occupant P so as to reach the shoulder portion Ws, and the second holding portion 22 is locked to the tongue 15. The seat belt tightening force reducing device 1 is attached to the webbing W by bringing the first holding portion 21 into contact with the shoulder anchor 12 after the both ends of the envelope 3 are overlapped and the fastener 31 is closed. .

  The abutting of the first holding portion 21 can be easily performed, for example, by using an operation in which the seat belt retractor 11 winds the slack webbing W. Note that the winding of the slack webbing W is processed by the operation of a spring or a motor disposed on the seat belt retractor 11.

  The above-described seat belt tightening force alleviating device 1 may be attached to the webbing W in advance. Specifically, with the fastener 31 open, the plate-like body 2 is directed to the shoulder portion Ws so that it can be placed between the webbing W and the occupant P, and the second holding portion 22 is locked to the tongue 15. Then, both ends of the envelope 3 are overlapped to keep the fastener 31 closed. Then, the occupant P seated on the seat S pulls out the tongue 15 and attaches it to the buckle 14 to attach the seat belt. At this time, the seat belt tightening force alleviating device 1 is disposed over the shoulder portion Ws of the webbing W and the shoulder portion Ps to the waist portion Pw of the occupant P. Furthermore, when the seat belt retractor 11 winds up the slack of the webbing W, the first holding portion 21 is abutted against the shoulder anchor 12.

  When the seat belt tightening force relaxation device 1 is mounted, the plate-like body 2 is curved with the first holding portion 21 and the second holding portion 22 as fulcrums as shown in the conceptual diagram of FIG. And a reaction force F is generated. In FIG. 2B, the black circle (●) means the locked state, and the black triangle (▼) shows the abutting state.

  The reaction force F counters the tightening force T generated by the tension of the webbing W, and reduces the feeling of pressure given to the occupant P by the tightening force T. Moreover, the reaction force F should just be a magnitude | size which can oppose the clamping force T which arises at the time of normal seatbelt mounting | wearing. The magnitude of the reaction force F of the seat belt tightening force alleviating device 1 can be arbitrarily adjusted by changing the material, plate thickness, length, etc. of the plate-like body 2. In an emergency such as a vehicle collision or sudden deceleration, the tension of the webbing W can be increased by winding the webbing W by the seat belt retractor 11, and the tightening force T can be made easier than the reaction force F. The occupant P can be restrained immediately.

  Next, a seat belt tightening force alleviating device 1 according to another embodiment of the present invention will be described. Here, FIG. 4 is a conceptual diagram showing a seat belt tightening force relaxation device according to another embodiment of the present invention, in which (A) shows a second embodiment, and (B) shows a third embodiment. ing. FIG. 5 is a diagram illustrating a modification of the holding unit, in which (A) illustrates a first modification, (B) illustrates a second modification, and (C) illustrates a third modification. In each figure, the same components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted. 4 (A) and 4 (B) are conceptual views showing the use state of the seat belt tightening force alleviating device 1 as in FIG. 2 (B).

  In the second embodiment shown in FIG. 4A, the first holding portion 21 is locked to the shoulder anchor 12 and the second holding portion 22 is locked to the tongue 15. As described above, the same effect as that of the first embodiment can be obtained by locking and holding both the first holding unit 21 and the second holding unit 22 to a part of the seat belt device.

  The 1st holding | maintenance part 21 in 2nd embodiment has the structure shown to FIG. 5 (A), for example. When the webbing W is pulled out from the upper surface of the shoulder portion of the sheet S, the shoulder anchor 12 having the slit-shaped opening 12a as shown in FIG. When the shoulder anchor 12 is provided, the first holding part 21 includes, for example, a gripping part 21c that can be locked to the outer peripheral part of the shoulder anchor 12, and a connecting part 21d for connecting the gripping part 21c to the plate-like body 2. Have.

  The gripping portion 21 c has, for example, a substantially C-shaped claw portion that can be locked to a pair of corner portions on the diagonal line of the outer shape of the shoulder anchor 12. The connecting portion 21d is configured by a woven fabric or synthetic resin having one end hung around the opening 21e of the gripping portion 21c and the other end fixed to the plate-like body 2.

  When the first holding part 21 is locked to the guide anchor 16 arranged on the pillar or the like instead of the shoulder anchor 12 arranged on the sheet S, the first holding part 21 is shown in FIG. You may have the structure shown in. The first holding part 21 shown in FIG. 5B has a fixing part 21f fixed to the guide anchor 16, and a connecting part 21g for connecting the plate-like body 2 to the fixing part 21f. In FIG. 5B, the webbing W is omitted for convenience of explanation.

  The fixing portion 21f is fixed to both ends of the guide anchor 16 by a fastener 21h such as a bolt and has a recess 21i through which the webbing W can be inserted. In addition, an opening 21j into which the connecting portion 21g can be inserted is formed at the lower portion of the fixed portion 21f, and an insertion port 21k for inserting the connecting portion 21g is formed at the bottom of the opening 21j. On the other hand, the connecting part 21g has a tip part 21m inserted into the opening part 21j. For example, both ends of the tip 21m are formed in a leaf spring shape, and after passing through the insertion port 21k, both sides are opened to the left and right and locked to the opening 21j.

  The 2nd holding | maintenance part 22 in 2nd embodiment may have the structure shown to FIG. 3 (A), for example, and may have the structure shown to FIG. 5 (C). The second holding part 22 shown in FIG. 5C has a clip 22d that can hold the tongue 15 and a connecting part 22e for connecting the clip 22d to the plate-like body 2.

  The clip 22d has, for example, a front end portion 22f capable of gripping both end portions of the tongue 15 and a concave portion 22g through which the webbing W can be inserted. Further, the pair of clip pieces constituting the clip 22d are assembled together by the shaft portion 22h and urged by the spring 22i in the direction in which the tip portion 22f is closed. With this configuration, by applying a force to the end opposite to the tip 22f, the tip 22f can be opened and the tongue 15 can be sandwiched and held without interfering with the webbing W. The two holding portions 22 can be held by the tongue 15.

  Further, the configuration of the second holding portion 22 shown in FIG. 5C may be applied to the first holding portion 21 that is engaged with the guide anchor 16 disposed in the pillar or the like. In this case, the clip of the first holding portion 21 holds and grips both end portions of the guide anchor 16.

  Then, the seatbelt clamping force relaxation apparatus 1 which concerns on 4th embodiment of this invention is demonstrated. Here, FIG. 6 is a view showing a seat belt tightening force alleviating device according to a fourth embodiment of the present invention, in which (A) is a front view in a use state, and (B) is a perspective view with an envelope opened. Figure. In each figure, the same components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  In the fourth embodiment shown in FIG. 6 (A) and FIG. 6 (B), the length of the plate-like body 2 is changed to a length arranged from the shoulder Ps of the occupant P to the region of the chest Pb. Is. In the fourth embodiment, the plate-like body 2 has only the first holding portion 21 that is arranged at one end and is held by a part of the seat belt device (shoulder anchor 12).

  Since the first holding portion 21 in the fourth embodiment supports the seat belt tightening force relaxation device 1 in a cantilever manner, as shown in FIG. 6B, for example, in FIG. The structure latched by the shoulder anchor 12 like the 1st modification of the holding | maintenance part shown is applied. In the fourth embodiment, since the length of the plate-like body 2 is short, even if the seat belt tightening force alleviating device 1 is mounted on the webbing W in advance, it is difficult for the passenger P to get in and out. In addition, the connection part 21d of the 1st holding | maintenance part 21 may be connected with respect to the plate-shaped body 2 by the hinge so that rotation is possible, and may be slidably connected along the opening part 21e.

  Further, in the seat belt tightening force alleviating device 1, the webbing W tightens the occupant P in a state where the first holding portion 21 is held by the shoulder anchor 12, so that the first holding portion 21 is provided at the tip of the plate-like body 2. As a fulcrum, a reaction force F is generated, which can counter the tightening force T of the webbing W, and the feeling of pressure applied to the occupant P by the tightening force T can be reduced. In particular, the tightening force T of the webbing W on the chest Pb where the occupant P can easily feel a pressure can be relaxed, and the pressure can be effectively reduced.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention, for example, an elastic body such as rubber may be disposed as a cushioning material at the edge portion of the plate-like body 2. Of course there is.

DESCRIPTION OF SYMBOLS 1 ... Seat belt clamping force relaxation device 2 ... Plate-shaped body 3 ... Envelope 11 ... Seat belt retractor 12 ... Shoulder anchor 12a ... Opening part 13 ... Belt anchor 14 ... Buckle 15 ... Tongue 16 ... Guide anchor 21 ... First holding part 21a ... Abutting portions 21b, 21d, 21g ... connecting portion 21c ... gripping portions 21e, 21j ... opening portion 21f ... fixing portion 21h ... fastener 21i ... recess 21k ... insertion port 21m ... tip portion 22 ... second holding portion 22a ... Gripping portions 22b, 22e ... connecting portion 22c ... locking groove 22d ... clip 22f ... tip 22g ... recess 22h ... shaft 22i ... spring 31 ... fastener 31a ... male surface fastener 31b ... female surface fastener 32 ... cylindrical portion

Claims (6)

A seat belt tightening force relaxation device mounted on a webbing of a seat belt device that restrains an occupant,
A plate-like body disposed between the occupant and the webbing when the seat belt is mounted, and an envelope that wraps the plate-like body and the webbing, and the plate-like body is disposed at one end or both ends. Having a holding part held in a part of the seat belt device;
The holding portion is held by a part of the seat belt device, and the tightening force applied to the occupant due to the tension of the webbing is relieved using the reaction force of the plate-like body. Seat belt tightening force relaxation device.   The seat belt tightening force alleviating device according to claim 1, wherein the holding portion is held by being brought into contact with or being locked to a part of the seat belt device.   The seat belt tightening force alleviating device according to claim 1, wherein the holding portion is held by a tongue, a shoulder anchor, or a guide anchor of the seat belt device.   The seat belt tightening force alleviating device according to claim 1, wherein the plate-like body has a length that extends from a shoulder portion to a waist portion or a shoulder portion to a chest region of the occupant.   The seat belt tightening force alleviating device according to claim 1, wherein the plate-like body has a width larger than a width of the webbing. The seat belt tightening force alleviating device according to claim 1, wherein the envelope includes a fastener for enclosing and restraining the plate-like body and the webbing.