JPH048263B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is applicable to a seatbelt pulled out from a take-up reel with an emergency locking mechanism installed in a vehicle such as an automobile in the event of a high-impact vehicle collision or rollover accident. This invention relates to a seat belt retractor equipped with a clamp mechanism that clamps the seat belt in an emergency and prevents the belt from being extended thereafter.

(Prior Art) In a seat belt device for safely holding an occupant of an automobile, etc., it is preferable that the pulled-out belt has an appropriate tension under normal belt usage conditions. This eliminates the feeling of restraint when using the belt, but on the other hand, the seatbelt in the belt winding device has a spring that allows for the remaining pulling force, and the webbing itself stretches, allowing the belt to be wrapped around the take-up reel in the event of an emergency lock. Even if this locking is performed, extension due to inertial force and tightening phenomenon on the take-up reel are still observed, resulting in a failure to ensure a sufficient occupant retention function.

Therefore, in conventional seat belt systems, a belt retractor is used, which has an emergency locking retractor equipped with a clamp mechanism, and which suppresses belt extension in the event of a high impact such as a collision or rollover. .

As shown in FIG. 4, this type of conventional seat belt retractor with a clamp has a belt reel installed between opposing side plates 1a and 1b of a frame board 1 bent into a U-shape. 2 is rotatably installed, one end of the seat belt 3 is fixed to the take-up reel 2, and the seat belt 3 is wound such that it can be pulled out and rolled in, and the fixed side clamp member is kept apart from the belt 3. 4 and a movable clamp member 6 provided at the tip of the swinging lever 5, and then passed around the rotating roller 8, which is urged downward by the spring 7, and brought into contact with the uneven surface of the outer periphery. The structure is such that it changes direction and is drawn upward in a U-shape.

In the figure, S is a stopper provided on the side plate 1a and engaged with the swing lever 5 in an unclamped state.

The frame board 1 also has a pawl 9 located below the take-up reel 2 inside the frame board 1, and an emergency lock mechanism consisting of a pendulum or the like that engages the pawl 9 with a ratchet 10 fixed to the take-up reel 2 to prevent rotation. It is integrally equipped with. (For example, see Japanese Utility Model Application Publication No. 58-80252.) Therefore, in the seat belt retractor having the above structure, when the vehicle is in a normal driving state or in a stopped state, the belt 3 pulled out from the take-up reel 2 is separated. It passes between the fixed side clamp member 4 and the movable side clamp member 6, which are in the current state, and is wrapped around the rotating roller 8, and is freely pulled out and rolled in as the occupant's upper body moves while being guided upwards. At the same time, when the emergency lock mechanism is activated in response to an accident such as a vehicle collision and a tensile force of more than a predetermined value is applied to the belt 3, the rotating roller 8 moves upward against the biasing force of the spring 7. and the uneven surface 8a on its outer periphery
engages with the unevenness 6a of the movable clamp member 6,
Press the clamp member 6 to bring it close to the fixed side clamp member 4, and then move the belt 3 between both clamp members 6,
4, thereby preventing the belt from extending further.

(Problem to be Solved by the Invention) However, conventional emergency lock type retractors generally lock the rotation of the take-up reel when the seat belt withdrawal speed reaches a predetermined value or higher, and prevent the belt from extending. Since the seat belt 3 is equipped with a webbing sensor that prevents it from being rolled up and stored in the retractor, members such as tongs attached to the pull-out end of the seat belt 3 may reach the belt pull-out opening of the retractor. At the moment when the belt is pulled back and stops colliding with the belt pull-out opening, the sensor weight malfunctions due to inertia force, and the rotation of the take-up reel 2 in the belt pull-out direction tends to be unexpectedly locked, a so-called end lock. . Therefore, in the seat belt retractor with a clamp as shown in FIG. The seat belt 3 has been slightly displaced toward the clamp position, and is constantly trying to return to the non-clamp position, that is, downward in the figure, due to the action of the spring 7.
When the seatbelt 3 is completely wound up, tension is applied to the wrapped portion of the seatbelt 3, causing the end-lock phenomenon in the emergency locking mechanism of the winding device, making it impossible to pull out the seatbelt afterwards. Ta.

It should be noted that the end lock caused by the malfunction of the emergency lock mechanism itself can be overcome by the means previously proposed by the present inventor in Japanese Unexamined Patent Publication No. 59-88165, but If a clamp mechanism as described above is provided in order to prevent this, there is a fear that the operation of the rotary roller 8 may induce end lock, and there remains room for further improvement in this respect.

The present invention has focused on the problem of end lock occurring due to the movement of the rotating roller that the conventional seat belt retractor with a clamp had, and the present invention has focused on the problem of end lock occurring due to the movement of the rotating roller that the conventional seat belt retractor with a clamp had. When the belt is rotating in the pulling direction, its center position is held in the non-clamping position to prevent it from moving toward the clamping position, thereby preventing the emergency locking mechanism from locking at the end. When the clamp is rotating in the direction, it is made movable and maintains the normal clamping function, thereby solving the above-mentioned problem.

(Means for Solving the Problems) The structure of the present invention for achieving the above object will be explained in detail based on FIGS. 1 to 3 corresponding to embodiments.

Both side plates 11a, 11 of the U-shaped frame board 11
An inverted U-shaped swinging lever 14 is swingably mounted below the take-up reel 12 of the emergency lock-type winding device installed between
A rotating roller 16 is provided with a large number of concave and convex engaging teeth 19 on its outer periphery within a pair of left and right elongated holes 17 and 17' formed in the side plates 14a and 14b of the swing lever 14.
is supported so that it can move in parallel and rotate freely with its support shafts 18, 18' inserted therethrough.

The rotating roller 16 has support shafts 18 at both ends thereof,
At least one end of the roller 18' is provided with a movement blocking means S that operates in accordance with the direction of rotation of the rotating roller 16.

The movement blocking means S includes the support shafts 18, 18'.
A locking arm 29 is rotatably fitted onto the end of the locking arm 29 via a friction clutch member 33, and a locking arm 29 is provided on the side wall 11a or 11b of the frame substrate 11 and faces the hook portion 30 at the tip of the locking arm 29. and a guide groove 36 provided with a locking step 35 that can be engaged with the guide groove 36.

In the figure, 22 is a movable clamp member fixed to the swing end of the swing lever 14, 26 is a concave and convex engagement tooth 27 facing the engagement tooth 28 of the movable clamp member 22, and The fixed side clamp member fixed to the bottom plate portion 11c of the frame substrate 11 has a surface facing the rotary roller 16 on the side of the movable side clamp member 22, which has an uneven engagement formed on the outer periphery of the rotary roller 16. Engagement teeth 24 that can mesh with the teeth 19 are formed.

Note that 21 is a spring that urges the rotary roller 16 downward, and 38 is the swing lever 1.
This is a stopper that engages with 4 and limits its swing angle.

(Function) In the seat belt retractor with a clamp having the above-mentioned configuration, as shown in FIG.
, and the swing lever 14 is placed in the non-clamped position, that is, on the side where the movable clamp member 22 and the fixed clamp member 26 maintain a state of separation from each other, and the rotary roller 16 is freely rotatable in this position. Since the seat belt 13 is supported, the seat belt 13 wound around the rotating roller 16 can be freely pulled out and retracted from the take-up reel 12.
When the seat belt 13 is wound onto the take-up reel 12, the locking arm 29, which is frictionally fitted to the end of the rotating roller 16 via the friction clutch member 33, rotates in the same direction, and the end of the locking arm 29 is rotated in the same direction. The hook portion 30 engages with the locking step portion 35 of the guide groove 36, and the rotating roller 1
6 is prevented from moving toward the clamp position side, thereby preventing the seat belt from being clamped by the clamp mechanism, and also preventing end lock due to malfunction of the emergency lock mechanism attached to the take-up reel 12.

Further, when the seat belt 13 is pulled out or when a load is applied to the seat belt 13 and the seat belt 13 is moved in the pull-out direction, the rotating roller 16 rotates in the belt pull-out direction, and the locking arm 2
9 rotates in the same direction, and the hook portion 30 at the tip engages the guide groove 3.
6, the rotating roller 16 is allowed to move and performs a normal clamping function.

Therefore, in this state, the emergency lock mechanism attached to the take-up reel 12 is activated, and the seat belt 13 is activated.
When a tension of more than a predetermined value is applied to the rotary roller 16, the upward force acting on the rotating roller 16 causes the elongated hole 1 of the swing lever 14 to resist the biasing force of the spring 21.
7, 17', the outer circumferential engagement tooth 19 engages the engagement tooth 24 of the movable clamp member 22, and presses the movable clamp member 22 toward the fixed clamp member 26, so that both seat belt 1 between
3 to prevent the belt from extending later.

(Example) Examples of the present invention will be described in detail below based on the accompanying drawings.

1 and 2 are side sectional views of a seat belt retractor with a clamp according to the present invention, in which a first
The figure shows a state in which the seat belt is not clamped to allow passage of the seat belt, and FIG. 2 shows a state in which the seat belt is clamped.

In these figures, 11 is a frame board formed by bending a single thick metal plate into a U-shape, and both sides of the frame board 11 are 11a and 11b.
A belt take-up reel 12 equipped with a known emergency lock mechanism is rotatably installed between the seats, and one end of a seat belt 13 is attached to the take-up reel 12 so that it can be pulled out and rolled up. equipped.

Further, the frame board 11 is arranged between both side plates 11a and 11b below the take-up reel 12.
Swing lever 1 formed by bending a plate material into an inverted U-shape
The proximal end side of 4 is pivotally supported via a fulcrum pin 15 so as to be swingable.

16 denotes both side plates 14a of the swing lever 14,
By inserting support shafts 18, 18' extending outward along the central axis from both end faces into the elongated holes 17, 17' formed opposite to each other in the elongated holes 17, 17'. The rotating roller 16 is a rotating roller that is supported on a shaft so as to be able to move parallelly and rotate freely along the axis.
The drawer side of the frame board 1 is hung around, folded back into a U-shape, and guided upward.
0, the tension spring 21 is always biased toward the non-clamped position, that is, in the direction of the arrow X.

Further, reference numeral 22 denotes a movable side clamp member fixed by a bolt 23 on the swing end side of the swing lever 14, and the movable side clamp member 22 is
a fixed side clamp having engaging teeth 24 on a portion facing the outer circumferential surface of the rotating roller 16, and fixed with bolts 25 to the bottom plate portion 11c on the surface facing the bottom plate portion 11c of the frame substrate 11; A belt clamping surface 28 having an uneven wave shape that can engage with the corrugated belt clamping surface 27 of the member 26 and clamps the seat belt 13 between the belt clamping surface 27 and the belt clamping surface 27 .
have.

The rotary roller 16 has at least one end of the spindles 18, 18' inserted into the elongated holes 17, 17' of the swing lever 14, with a tip end serving as a movement blocking means S as shown in FIG. The proximal end side through hole 31 of the locking arm 29 equipped with a hook portion 30 is rotatably inserted into the U, and the locking arm 29 is prevented from rotating by a protrusion 32 formed on the outer surface thereof.
A concave curved portion of a friction clutch member 33 made of a letter-shaped leaf spring is frictionally fitted into a circumferential groove 34.

Further, on the side wall 11a or 11b of the frame board 11 facing the locking arm 29, there is an L-shaped guide groove 36 provided with a locking step portion 35 that can be engaged with the hook portion 30 at the tip of the locking arm 29. Contour-forming rib-like projections 37 are provided.

In the figure, 38 is a stopper attached to the side plates 11a and 11b of the frame board 11 near the swing lever 14, and the stopper 38 is engaged with the swing lever 14 at the non-clamped position side in FIG. However, the range of rotation of the swing lever 14 about the fulcrum pin 15 is limited.

The seat belt retractor with a clamp of the present invention has the above-mentioned configuration, and its operation will be explained next. First, when the vehicle is in normal driving condition, the seat belt retractor with a clamp The belt 13 passes through the gap between the movable clamp member 22 and the fixed clamp member 26, which are separated by the action of the spring 21, is guided by the rotating roller 16, turns into a U-shape, and is guided upward. However, as the occupant's upper body moves, the seat belt 13 is freely pulled out and retracted.
When the rotating roller 1
6 contacts the seat belt 13 and rotates in the winding direction (arrow v direction), and the spindle 18 of the rotating roller 16
Alternatively, the locking arm 29 that is frictionally engaged with the locking arm 18' rotates in the same direction (in the direction of the arrow v), and the hook portion 30 at its tip engages with the locking stepped portion 35 of the guide groove 36. Movement to the clamp position side by the movement preventing means S including the locking arm 29, that is, arrow Y in FIG.
movement in this direction is prevented, and the winding device is prevented from locking at the end when the seat belt is fully retracted.

Now, in the above-mentioned unclamped state, when the emergency lock mechanism provided on the take-up reel 12 is activated in response to an accident such as a vehicle collision, and a tensile force of more than a predetermined value is applied to the seat belt 13, the second As shown in the figure, due to the slight extension of the seat belt 13, the rotating roller 16 is moved in the belt pulling direction (arrow U
direction), the locking arm 29 rotates in the same direction, and the hook portion 30 at the tip engages the locking stepped portion 35 of the guide groove 36.
In order to separate from the rotating roller 16, due to an upward force acting on it or a component thereof,
The swinging lever 14 resists the biasing force of the spring 21.
The engaging teeth 19 are moved in parallel within the long holes 17, 17'.
is engaged with the engagement teeth 24 of the movable clamp member 22 to stop rotation, and at the same time presses the movable clamp member 22 toward the fixed clamp member 26,
Belt clamping surfaces 27 of both clamp members 22, 26,
The seat belt 13 is clamped between 28 and the seat belt is prevented from extending later.

Note that when the vehicle exits the emergency state and returns to the normal driving state and the tension of the seat belt 13 decreases, the swing lever 14 returns to the unclamped position due to the biasing force of the spring 21 as shown in FIG. , comes into contact with the stopper 38, the rotating roller 16 moves downward along the elongated holes 17, 17' of the swing lever 14, and the outer peripheral engagement teeth 19 separate from the engagement teeth 24 of the movable clamp member 22. Since the seat belt 13 is rotatably supported, the seat belt 13 freely passes between the clamp members 22 and 26 and is guided by the rotating roller 16 so as to be able to be pulled out and rolled in.

Also, during this time, when the rotating roller 16 is rotating in the winding direction of the seat belt 13, the hook portion 30 of the locking arm 29 engages the locking step portion 35 of the guide groove 36.
is engaged again to prevent the rotation roller 16 and the swing lever 14 from moving toward the clamp position.

In the above embodiment, a clamping mechanism including a rotating roller 16, a swinging lever 14, etc. is installed on a common frame substrate 11 with a take-up reel 12 equipped with an emergency locking mechanism, and this is attached to the lower part of the vehicle body to secure the sheet. Although the case where the belt is pulled upward is illustrated, the device of the present invention is not limited to this. For example, the device of the present invention is attached to the upper part of the vehicle body with only the clamp mechanism alone, and the belt is pulled upward from the emergency lock type winding device installed at the lower part of the vehicle body. The shoulder seat belt that has been pulled out is wrapped around the rotating roller of the clamp mechanism, turned into an inverted U shape, and guided downward to prevent the shoulder seat belt from extending in an emergency. is also available.

Further, regarding the clamp mechanism, in the above embodiment, the rotating roller 16 is supported in the long holes 17, 17' of the swinging lever 14. The side walls 11a, 1 of the frame board 11 as shown in FIG.
It may be directly supported by a long hole drilled in 1b, and in any case, any mechanism in which the belt clamping operation of the clamp mechanism is performed by the movement of the rotating roller 16 can be applied.

(Effects of the Invention) As described above, the seat belt retractor with a clamp of the present invention winds the seat belt pulled out from the take-up reel with an emergency lock mechanism around the rotating roller biased by a spring toward the non-clamp position. and turned,
The clamping mechanism is moved to a belt clamping state by movement of the rotating roller as the tension of the seat belt changes, and the rotating roller is configured to change its position to the non-seat belt when it rotates in the winding direction of the seat belt. The belt is held at the clamp position to prevent movement toward the clamp position, and when the rotating roller rotates in the belt pulling direction, the blocking is released and the rotating roller is allowed to move toward the clamp position. Therefore, when the rotating roller is in contact with the seat belt and rotating in the belt winding direction when the seat belt is retracted, the center of rotation is maintained at the non-clamping position. This prevents the take-up reel from shifting toward the clamp position, thereby preventing end-lock due to malfunction of the emergency lock mechanism attached to the take-up reel. When the roller is rotating in the direction of pulling out the belt, it is enabled to move toward the clamp position side, allowing the clamp mechanism to operate normally, and reliably preventing the seat belt from extending, thereby ensuring safety and safety due to the seat belt. It has the excellent effect of greatly improving the usability of the winding device.

[Brief explanation of drawings]

1 and 2 are side sectional views showing an example of a seat belt retractor with a clamp according to the present invention, FIG. 3 is an exploded perspective view showing an example of a movement preventing means applicable to the device, and FIG. The figure is a side sectional view of a conventional take-up device with a clamp. 11...Frame board, 12...Take-up reel,
13... Seat belt, 16... Rotating roller, 1
8, 18'... Support shaft, 21... Spring, 29
... Locking arm, 30 ... Hook portion, 33 ... Friction clutch member, 35 ... Locking step, 36 ... Guide groove, S ... Movement blocking means.

Claims (1)

[Claims] 1. A clamp position that approaches the take-up reel in the middle of the pull-out path of the seat belt pulled out from the take-up reel equipped with an emergency lock mechanism to prevent the seat belt from being pulled out, and a clamp position that approaches the take-up reel and prevents the seat belt from being pulled out, and a clamp position that moves away from the take-up reel and closes the seat belt. A rotary roller is disposed so as to be able to move in parallel between an unclamped position that allows the seat belt to be pulled out, and the pulled-out portion of the seat belt is wrapped around the outer periphery of the rotary roller to guide the seat belt in a U-shape. In addition, in the seat belt retractor with a clamp, in which the rotating roller is biased by a spring toward the non-clamping position, the rotation is applied to at least one of the spindles of the rotating roller via a friction clutch member. a locking arm that is rotatably fitted into the roller; and a locking step that is provided on a side plate of the frame adjacent to the locking arm and that is engageable with a hook provided at the tip of the locking arm. When the rotating roller rotates in the winding direction of the seat belt, the hook portion engages with the locking stepped portion to hold the rotating roller in the unclamped position and prevent the rotating roller from moving toward the clamping position. blocking, and when the rotating roller rotates in the belt pulling direction, the engagement between the locking stepped portion and the hook portion is released, and the blocking is released;
A seat belt retractor with a clamp, characterized in that a movement preventing means is provided for allowing the rotating roller to move toward the clamp position.