JP2006044581A - Seat belt device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance mounting work efficiency of a seat belt device to a vehicle. <P>SOLUTION: A retractor 1 is wound on a rotation drum 11 by spring force such that a webbing 2 can be drawn out. The webbing 2 drawn out from the retractor 1 is passed through a shoulder anchor provided at an upper position in a cabin and is downwardly folded and returned, a tongue is attached to the midway thereof and a lower end is fixed to a lower position in a cabin by an engagement fitting. A winding restriction means 5 for restricting a winding diameter of the webbing wound on the rotation drum 11 is provided on the retractor 1. The winding restriction means 5 is attached to a frame 3 of the seat belt retractor 1 and a head part 521 of a winding restriction projection 52 is projected toward an outer periphery of the webbing 2 wound on the rotation drum 11 by a predetermined amount. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicle seat belt device, and more particularly, to a vehicle seat belt device that includes a seat belt retractor and that can be easily attached to a vehicle.

An example of this type of seat belt device is shown in FIG. In FIG. 6, the three-point seat belt device includes a retractor 1 with a built-in emergency lock mechanism, a webbing 2, a shoulder anchor 21, a tongue 22, a locking fitting 23, and a buckle 25. The emergency lock mechanism detects the sudden deceleration of the vehicle and locks the webbing 2 so that it cannot be pulled out. The webbing 2 is drawn upward from the retractor 1 provided near the vehicle floor, and is folded downward via a shoulder anchor 21 installed near the vehicle roof. A tongue 22 is slidably attached to the folded webbing 2 in the middle, and the lower end of the webbing 2 is fixed near the vehicle floor by a locking fitting 23. A locking protrusion 24 is formed in the middle of the webbing 2 that goes downward to prevent the tongue 22 from falling along the webbing 2. In addition, the retractor 1 is drawing in the webbing 2 with the spring force of the spring member provided inside. When the seat belt device is used, as shown by a chain line in FIG. 6, the webbing 2 is pulled out in front of the seat back S1 of the vehicle seat S against the retracting force of the retractor 1, and is placed on the opposite side of the seat cushion S2. The tongue 22 is coupled to the provided buckle 25. A three-point seat belt device using a retractor is disclosed in Patent Document 1, for example.
JP2004-50914

  By the way, in such a seat belt device, as shown in FIG. 7, most of the webbing 2 is wound around the rotating drum 11 of the retractor 1, and the tip of the relatively short webbing 2 remaining outside the retractor 1 without being wound up. The assembly 26 is delivered to the vehicle assembly line as an assembly having a shoulder anchor 21 and a tongue 22 attached thereto. Therefore, when the seat belt device is attached to the vehicle, the retractor 1 is fixed near the vehicle floor. In this state, the webbing 2 is pulled out from the retractor 1 to the vicinity of the roof in order to attach the shoulder anchor 21, and the shoulder anchor 21 is attached to the vehicle. After fixing to the chamber wall, the webbing 2 is inverted downward through this and pulled out further, and the locking fitting 23 at the tip of the webbing 2 is fixed near the vehicle floor. At this time, in a large van type vehicle or the like, since the distance L (FIG. 6) from the attachment position of the retractor 1 to the attachment position of the shoulder anchor 21 becomes considerably long, it is necessary to pull out the webbing 2 greatly. However, when pulling out the webbing 2 from the retractor 1, the posture of the retractor 1 changes due to the tensile force unless the pulling direction is set to an appropriate direction, and this is detected by the emergency lock mechanism as a sudden deceleration of the vehicle. Due to the locking, there is a problem that it is difficult to carefully pull out the webbing 2 in a certain direction for a relatively long distance, and the workability is poor.

  Therefore, the present invention solves such a problem, and an object of the present invention is to provide a vehicle seat belt device with improved workability in attachment to a vehicle.

  In order to achieve the above object, according to the first aspect of the present invention, a webbing (2) whose one end is fixed at a lower position in the vehicle and a spring force attached to the lower position in the vehicle so that the other end of the webbing (2) can be pulled out. The retractor (1) having an emergency lock mechanism for detecting the sudden braking of the vehicle and locking the webbing (2) so that it cannot be pulled out, and the retractor (1) attached to the upper position in the vehicle and pulled out from the retractor (1) A shoulder anchor (21) through which the webbing (2) is slidably inserted, and a tongue plate (22) which is slidably inserted into the webbing (2) between one end of the webbing (2) and the shoulder anchor (21). A vehicular seatbelt device to which webbing (2) does not need to be pulled out at all or almost when pulling retractor (1) and shoulder anchor (21) to a vehicle. (2) in a state that is pulled out, provided with a webbing winding regulating means for regulating a further winding (2) (5,6).

  In the first aspect of the present invention, when the retractor and the shoulder anchor are attached to the vehicle, the webbing is pulled out from the retractor to the extent that it is not necessary to pull out at all or almost by the winding restricting means. Therefore, after fixing the retractor near the vehicle floor, the webbing pulled out from the retractor can be started up as it is, and the shoulder anchor attached to it can be fixed near the vehicle roof. There is no need to work with care. Therefore, the work of attaching the seat belt device to the vehicle is greatly speeded up.

  In the second aspect of the invention, the winding restricting means (5, 6) does not inhibit the webbing withdrawal. In the second aspect of the present invention, it is not necessary to remove the winding restricting means after the seat belt device is attached.

  In the third aspect of the invention, the winding restricting means (5, 6) is elastically locked to the retractor (1). In the third aspect of the invention, the winding restricting means can be easily installed on the retractor.

  In the fourth aspect of the invention, the winding restricting means (5, 6) is in contact with the outer peripheral surface of the webbing (2) wound up when the webbing (2) is wound up by a predetermined length. 2) Further winding is restricted. In the fourth aspect of the invention, when the webbing is slightly pulled out, the winding diameter of the webbing is reduced, and the winding regulation means does not contact the outer peripheral surface of the webbing being wound. Don't be. That is, it is necessary to pull out the webbing when fixing one end of the webbing to the vehicle after fixing the retractor and the shoulder anchor to the vehicle after the length of the webbing held in the state pulled out by the winding restricting means. If the length is set, the winding restricting means does not become a resistance when pulling out the webbing during normal use.

  In addition, the code | symbol in the said parenthesis shows the correspondence with the specific means as described in embodiment mentioned later.

  As described above, according to the vehicle seat belt device of the present invention, it is not necessary to carefully pull out the webbing from the retractor for a relatively long distance, so that the workability of attaching the device to the vehicle can be improved.

(First embodiment)
As described in the prior art (see FIG. 6), the seat belt device includes the retractor 1, the webbing 2, the shoulder anchor 21, the tongue 22, the locking fitting 23, and the buckle 25. FIG. 1 shows an exploded perspective view of a main part of a retractor to which the present invention is applied. In FIG. 1, the retractor 1 includes a frame 3, and the frame 3 is formed in a substantially U shape including left and right side walls 31, 32 and a bottom wall 33 connecting them. The side walls 31 and 32 are formed with circular openings 34 formed with locking tooth molds 35 on the inner periphery, and the rotating drum 11 serving as a rotating shaft is disposed so that the centers coincide with these openings 34. The rotary drum 11 is rotatably supported at both end shaft portions 111 by bearing covers 12 (see FIG. 7) attached to the outer surfaces of the side walls 31 and 32. An L-shaped plate-shaped guide member 4 including a standing wall 41 and a bottom wall 42 is coupled to the bottom wall 33 of the frame 3 by the bottom wall 42. A laterally long opening 411 that allows the webbing 2 to pass into the retractor 1 is formed in the standing wall 41 of the guide member 4. A bezel 43 is attached to the horizontally long opening 411 as shown in FIG. Further, a long plate-like frame member 36 is installed between the front portions of the upper ends of the side walls 31 and 32 of the frame 3. The retractor 1 includes the frame 3, the rotating drum 11, the guide member 4, and the frame member 36 as components. The retractor 1 incorporates an emergency lock mechanism (not shown) that detects a sudden deceleration of the vehicle and locks the webbing 2 so that it cannot be pulled out.

  FIG. 2 is a perspective view of the assembled retractor 1 from below, and the webbing 2 is drawn into the retractor 1 from the opening 411 of the guide member 4 to which the bezel 43 is attached. The webbing 2 drawn into the retractor 1 from the opening 411 is wound around the outer periphery of the rotary drum 11. The rotary drum 11 is urged to rotate in the direction of winding the webbing 2 by a built-in spring member. When the webbing 2 is pulled out, the rotary drum 11 is rotated in the direction opposite to the winding direction against the spring force.

  Here, in this embodiment, the winding restricting member 5 is mounted on the bottom wall 42 of the guide member 4. The winding restricting member 5 is formed by integrally molding a resin material, and includes a substrate portion 51. A winding restricting protrusion 52 formed in an inverted L-shaped cross section protrudes on the upper surface of one end of the substrate portion 51 at the left and right positions. In addition, a locking projection 53 having a hook-shaped tip 531 is projected from the upper surface of the other end at the left and right positions. Note that a square hole 511 for stealing meat is formed in the board portion 51 at the left and right positions.

  As shown in FIG. 3, the winding restricting member 5 has an end edge of the bottom wall 33 of the frame 3 and an edge of the square hole 421 of the guide member 4 in the space between the head portion 521 of the winding restricting protrusion 52 and the substrate portion 51. While being inserted, the tip 531 of the locking projection 53 is elastically locked to the opening edge of the square hole 421 of the guide member 4 and is mounted on the guide member 4. In this state, the head 521 of the winding restricting projection 52 protrudes from the inner surface of the bottom wall 33 of the frame 3 by a thickness d with respect to the center O of the rotating drum 11. When the webbing 2 is wound around the rotary drum 11 by the spring force, the winding diameter gradually increases, but when the outer periphery of the wound webbing 2 comes into contact with the head 521 of the winding restricting protrusion 52, further winding is performed. The winding diameter on the rotating drum is the original winding diameter when the winding restriction projection 52 is not present, that is, the winding diameter when the outer periphery of the webbing 2 is in contact with the inner surface of the bottom wall 33 of the frame 3. Is limited to a diameter smaller than d. As a result, the winding amount of the webbing 2 around the rotating drum 11 decreases, and the distance from the mounting position of the retractor 1 to the mounting position of the shoulder anchor 21 without being wound around the rotating drum 11 outside the retractor 1. The webbing 2 having a length close to L (FIG. 6) is exposed.

  Thus, when the seat belt device is attached to the vehicle, the retractor 1 is fixed near the vehicle floor, and then the webbing 2 exposed from the retractor 1 is started up as it is, and the shoulder anchor 21 mounted on the retractor 1 is moved to the vehicle. Fix it to the wall near the roof. Thereafter, the webbing 2 that is inverted downward at the shoulder anchor 21 needs to be further pulled out from the retractor 1 in order to fix the locking metal fitting 23 at the tip of the webbing 2 near the vehicle floor, but the retractor 1 and the shoulder anchor 21 are Since it is fixed to the vehicle, the webbing 2 can be easily pulled out from the retractor 1 while maintaining the direction in which the posture of the retractor 1 does not change, that is, the appropriate direction in which the emergency lock mechanism does not operate. When the webbing 2 is pulled out, if the webbing 2 is pulled out slightly, the winding diameter of the webbing 2 becomes small, and the head 521 of the winding regulating member 5 comes into contact with the outer peripheral surface of the webbing 2 being wound up. Since it disappears, it does not become resistance when pulling out the webbing 2 further. That is, the length of the webbing 2 held in the state pulled out by the winding restricting member 5 is set to the length of the webbing 2 when the retractor 1 and the shoulder anchor 21 are fixed to the vehicle, and then one end of the webbing 2 is fixed to the vehicle. If the length is set to a certain length, the winding restricting member 5 does not become a resistance when pulling out the webbing 2 during normal use.

(Second Embodiment)
FIG. 4 shows another embodiment of the present invention. In the present embodiment, the winding restricting member 6 is constituted by a resin cylinder 61. The cylindrical body 61 is opened at one place in the circumferential direction, and the open gap 62 of the cylindrical body 61 is pushed and widened so that the winding restricting member 6 is formed on the frame member 36 of the retractor 1 as shown in FIG. Elastically attached and locked to the outer periphery. In this state, the opening edge 621 of the winding restricting member 6 projects from the inner surface of the frame member 36 with respect to the center O of the rotating drum 11 by the thickness d. Thus, the winding diameter of the webbing 2 wound around the rotary drum 11 by the spring force is the original winding diameter when the winding restricting member 6 is not mounted, that is, the outer periphery of the webbing 2 is the bottom wall of the frame 3. 33 is limited to a diameter smaller than the winding diameter when contacting the inner surface, and the same effect as the first embodiment can be obtained.

It is a principal part disassembled perspective view of the retractor in 1st Embodiment of this invention. It is the perspective view which looked at the retractor from the downward direction. It is sectional drawing of a retractor. It is the perspective view which looked at the retractor in 2nd Embodiment of this invention from upper direction. It is sectional drawing of a retractor. It is a perspective view of the vehicle seat provided with the seatbelt apparatus which shows a prior art example. It is a top view of a seatbelt assembly.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Seat belt retractor, 11 ... Rotating drum, 2 ... Webbing, 21 ... Shoulder anchor, 22 ... Tongue, 23 ... Locking bracket, 5 ... Rewinding restriction member 521 ... head, 6 ... winding restricting member, 621 ... opening edge.

Claims (4)

One end of the webbing is fixed at a lower position in the vehicle, and the other end of the webbing is wound by a spring force so that the other end of the webbing can be pulled out, and the webbing is locked so that it cannot be pulled out by detecting sudden braking of the vehicle. A retractor having an emergency locking mechanism, a shoulder anchor that is mounted at an upper position in the vehicle and through which the webbing pulled out from the retractor is slidably inserted, and slides between one end of the webbing and a shoulder anchor A vehicle seat belt device including a tongue plate that is inserted through the webbing, wherein the webbing is pulled out to the extent that it is not necessary to pull out the webbing at all or almost when the retractor and the shoulder anchor are mounted on the vehicle. And further comprising a winding regulating means for regulating further winding of the webbing. That seat belt device for a vehicle. 2. The vehicle seat belt device according to claim 1, wherein the winding restricting means does not obstruct the pulling out of the webbing. The vehicle seat belt device according to claim 1 or 2, wherein the winding restricting means is elastically locked to the retractor. 2. The winding-up restricting means regulates further winding of the webbing by coming into contact with an outer peripheral surface of the webbing wound when the webbing is wound up by a predetermined length. 4. The vehicle seat belt device according to any one of items 1 to 3.

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