JPS628206Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is used in a seat belt device for protecting occupants in vehicle emergencies, and limits the winding force of the webbing for restraining occupants, thereby eliminating the feeling of pressure on the occupants. The present invention relates to a webbing winding force limiting device.

[Conventional technology and its problems]

In a seatbelt device, one end of the webbing for restraining an occupant is wound onto the take-up shaft of the take-up device by a biasing force, so that the middle part of the webbing is brought into close contact with the occupant, and the occupant unwinds most of the webbing after unfastening the webbing. Care has been taken to prevent the webbing from being scattered inside the car.

However, this webbing winding force acts on the occupants as a feeling of pressure, causing fatigue to the occupants during long-term driving, which in turn leads to a decline in the rate of seatbelt device use.

For this reason, various webbing winding force limiting devices have been proposed in the past, but all of them are complicated and large, and require significant changes to the conventional webbing layout.

In consideration of the above facts, the present invention aims to provide a webbing winding force limiting device that has a simple structure and can be easily attached to an existing seat belt device.

[Means for solving problems]

In order to achieve the above object, the present invention includes a webbing retraction force limiting device that is attached to a slip joint that folds back the middle part of the webbing for occupant restraint, and a guide member that rotates together with the webbing around the slip joint. The guide member is comprised of a mounting part rotatably attached to the slip joint, and a cylindrical part with an open end surface integrally connected to the mounting part,
This structure is characterized in that a lock member is provided which is pivotally supported on the cylindrical portion and which holds the webbing between the inner surface of the cylindrical portion and reduces the webbing winding force when the cylindrical portion is tilted at a predetermined angle.

[Effect]

In such a configuration, the cylindrical portion constituting the guide member is rotatably supported by the slip joint via its attachment portion. Therefore, in response to the inclination of the webbing, the attachment part and the cylindrical part rotate together around the slip joint, and in the inclined state, the webbing is held between the inner surface of the cylindrical part and the locking member. Therefore, the webbing can be easily and reliably clamped, thereby reducing the webbing winding force.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a seat belt device to which a webbing entrainment force limiting device 10 is applied, in which an occupant seated on a seat 14 is fitted with a three-point seat belt using an occupant restraining webbing 12. It's summery.

One end of this webbing 12 is locked to an anchor plate 18, and this anchor plate 1
8 is rotatably fixed to the lower part of the center pillar 22 of the vehicle by a mounting bolt 20. On the other hand, the other end of the webbing 12 is wound onto a winding device 24 attached to the middle portion of the center pillar 22. This winding device 24 is provided with a winding shaft (not shown) and a mainspring spring that rotates this winding shaft and biases it in the webbing winding direction. is granted. Further, this winding device 24 has a built-in inertia lock mechanism that detects acceleration and the like and instantly stops unwinding of the webbing 12 in case of a vehicle emergency.

In addition, a tongue plate 26 is provided in the middle of the webbing 12 so that it can be moved in the longitudinal direction of the webbing 12 with a predetermined operating force, and the tongue plate 26 is moved from the floor 28 of the vehicle body to the opposite side via the seat 14. This corresponds to the buckle device 30 that is installed upright. This buckle device 30 is provided with a release button 32 for releasing the engagement of the tongue plate 26.

Further, the webbing 12 between the tongue plate 26 and the winding device 24 is folded back at a slip joint 34 provided at the top of the center pillar 22. This slip joint 34 has a base plate 36 held by one side of an oval ring 38, this base plate 36 is rotatably fixed to the center pillar 22 with a mounting bolt 40, and the webbing 12 is attached to the oval ring 38. ring 38
It is wrapped around the other side and folded back.

Therefore, by engaging the tongue plate 26 with the buckle device 30, the occupant seated on the seat 14 can wear a three-point seat belt.
That is, the webbing 12 between the anchor plate 18 and the buckle device 30 is attached to the occupant's waist, and the webbing 12 between the buckle device 30 and the slip joint 34 is attached diagonally to the shoulder of the occupant. There is.

As shown in FIG. 2, the webbing 12 folded back at the slip joint 34 is in a nearly parallel state when the occupant is not wearing the webbing, but when the occupant wears the webbing, the slip joint 34 and the tongue The webbing between the plate 26 and the webbing between the slip joint 34 and the take-up device 24 is inclined at a predetermined angle (see angle θ in FIGS. 3 and 4).

Next, the winding force limiting device 10 includes a guide member 42 and a locking member 44.

The guide member 42 has a shape in which cylindrical parts 48 and 50 are integrally connected to both ends of a mounting part 46 having a substantially U-shaped cross section, and these parts are made of synthetic resin. The mounting portion 46 is formed with semicircular notches 52 and 54 for attaching the slip joint 34 to the oval ring 38, and the cylindrical portion 48,
50 respectively from the slip joint 34 to the anchor plate 18 and the webbing and winding device 24
When the webbings leading to the
4 surrounds an oblong ring 38 as shown in FIG. A plurality of slits 56 are cut in the outer periphery of the attachment portion 46 in the webbing width direction so that the intermediate portion can be appropriately bent. In addition to this slit 56, other means can be considered, such as making the central part of the mounting portion 46 thinner or having a bellows shape.

From slip joint 34 to tongue plate 2
A lock member 44 is pivotally supported by a pin 58 inside the cylindrical portion 48 that covers the webbing 12 extending to the webbing 12. This pin 58 has its axis aligned in the webbing width direction, and allows the abutment arc portion 60 of the locking member 44 to come into contact with and separate from the webbing 12. This lock member 44 is separated from the webbing 12 because the webbing 12 from the slip joint 34 to the tongue plate 26 is approximately vertical when the webbing is not attached as shown in FIGS. When it is attached to a passenger, its own weight causes the abutting circular arc portion 60 to move into the fourth,
As shown in FIG. 5, it comes into contact with the inclined webbing 12 due to its own weight. The abutting circular arc portion 60 that has come into contact with the webbing 12 in this way comes into a state where the webbing 12 is sandwiched between it and the inner circumferential surface of the cylindrical portion 48 due to its own weight, and this abutting circular arc portion 6
0 and the inner circumferential surface of the cylindrical portion 48 due to the curvature of the abutment arc portion 60.
It gradually becomes narrower towards the folded part. As a result, even though the locking member 44 is only in contact with the webbing 12 due to its own weight, when the webbing 12 moves slightly toward the take-up device, the abutting arcuate portion 60 contacts the cylindrical portion 48. Webbing 1 forms a wedge action between the inner peripheral surface of
2 is in the locked state.

The cylindrical parts 48 and 50 are provided with slits 62 so that the webbing 12 can be easily inserted into these parts.
It is preferable that the inside and outside of the cylindrical part be communicated with each other by being formed.

To explain the operation of this embodiment configured in this way, Figs. 1 and 2 show the state in which the webbing is not attached, and the passenger sits on the seat 14 and then attaches the tongue plate 2.
6 to the buckle device 30, a three-point seatbelt wearing state can be achieved.

In this state where the webbing is attached, the webbing 12 from the slip joint 34 to the tongue plate 26 has an inclination of an angle θ, as shown in FIGS. and rotates around the slip joint 34. Therefore, the locking member 44 rotates around the pin 58 under its own weight, and as shown in FIG. Prevents movement in 34 directions. Therefore, the webbing winding force by the take-up device 24 is reduced, and almost no tension is applied to the part of the webbing worn by the occupant, so that the occupant does not feel pressured by the webbing.
Furthermore, when the webbing is released, the webbing 12 between the slip joint 34 and the tongue plate 26 becomes vertical again as shown in FIGS. is separated from the webbing 12, and the winding force of the winding device 24 acts on the webbing again to wind up the webbing 12 as shown in FIG. 1 and bring it into the stored state.

[Effect of idea]

According to the present invention, the mounting part and the cylindrical part that constitute the guide member support the middle part of the webbing, and the mounting part and the cylindrical part follow the inclination of the webbing and are integrated around the slip joint. Since the webbing can be rotated and the webbing can be held between the inner surface of the cylindrical part and the lock member when the webbing is tilted by the rotation, the webbing can be easily and reliably held when the webbing is tilted at a predetermined angle. This makes it possible to reliably reduce the webbing winding force. Furthermore, since the structure is simple, it can also be applied to existing seat belt devices.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the webbing winding force limiting device according to the present invention, and FIG.
3 is a partial view of FIG. 1 showing an operating state, FIG. 4 is a sectional view taken along lines taken from FIG. 3, and FIG. 5 is a partially enlarged view of FIG. 4. DESCRIPTION OF SYMBOLS 10... Winding force limiting device, 12... Webbing, 34... Slip joint, 38... Oval ring, 42... Guide member, 44... Lock member, 46... Mounting part, 48, 50 ...cylindrical part,
60...Abutment arc portion.

Claims (1)

[Scope of utility model registration request] A guide member is attached to a slip joint that folds back the middle part of the occupant restraint webbing and rotates together with the webbing around the slip joint, and the guide member is rotatably attached to the slip joint. It consists of a mounting part and a cylindrical part with an open end that is integrally connected to the mounting part, and is pivoted to the cylindrical part so that when the webbing is tilted at a predetermined angle, the webbing is sandwiched between the inner surface of the cylindrical part and the cylindrical part. A webbing winding force limiting device characterized in that a locking member is provided to reduce the webbing winding force.