JPH08119064A - Webbing wind-up device - Google Patents

Abstract

PURPOSE: To properly switchover from ELR to ALR, and also eliminate an area remaining as extra winding. CONSTITUTION: A second switchover part 140 of a switchover cam 118 pushes up a switchover claw 106 of an ALR lever 68 under the condition of webbing just before it is completely pulled out. By this, the ALR lever 68 tends to change over from a second position separated from a lock ring 42 to an engaging first position. In this case, because the second switchover part 140 is engaged with the stepped part 142 of a switchover claw 106, the ALR lever 68 is held at the second position. Because, during that while, webbing can be pulled out completely, extra winding can be eliminated and, when the webbing is wound slightly from that condition, the engaged condition is released. Thus the engaged claw 108 of the ALR lever 68 is engaged with the lock ring 42.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a seat belt device and prevents the winding shaft from rotating in the webbing withdrawal direction only when the vehicle is rapidly decelerated, and withdrawing the webbing after the webbing has been withdrawn by a predetermined amount. The present invention relates to a webbing take-up device that can selectively use a webbing take-up device.

[0002]

2. Description of the Related Art A webbing retractor installed in a vehicle has a built-in lock mechanism for preventing rotation of the webbing in the pull-out direction when necessary.

A webbing retractor having a lock mechanism of this kind can usually retract and pull out the webbing. When the vehicle suddenly decelerates, the acceleration sensor detects it and the webbing of the takeup shaft is instantly pulled out. The so-called ELR that prevents rotation in the direction and the so-called AL that always prevents the subsequent withdrawal of the webbing after the webbing is withdrawn by a predetermined amount.
There is R.

Here, a webbing take-up device in which these ELR and ALR are installed together has already been devised by the applicant of the present invention (see, for example, Japanese Utility Model Laid-Open No. 3-121059).

In the webbing take-up device disclosed in this publication, the lock wheel rotates following the take-up shaft and is prevented from rotating to actuate the locking means to prevent the take-up shaft from rotating in the webbing pull-out direction. An ELR lever that is normally located at a position separated from the lock wheel, but engages with the lock wheel to prevent its rotation when the vehicle suddenly decelerates, an engagement position that engages with the lock wheel, and a lock. And an ALR lever that is selectively held at a separated position separated from the wheel. Further, a release gear for switching the position of the ALR lever is arranged coaxially with the winding shaft.

The release gear is decelerated when the winding shaft rotates and rotates in the opposite direction. When the webbing is pulled out by almost the full amount, the ALR lever is switched from the separated position to the engaged position. Further, the ALR lever is configured to be switched from the engagement position to the separation position by setting the webbing to be in a state in which almost all the webbing is wound.

By the way, in the above-described webbing retractor capable of switching between ELR and ALR as required, the full webbing full amount is pulled out from the ELR in consideration of cutting error of the webbing length, assembly error and the like. The configuration in which the ALR is switched to the ALR is avoided, and the configuration in which the ELR is switched to the ALR is performed at a timing with some margin. That is, in a state immediately before the webbing is fully pulled out (a position 20 to 100 mm before the fully pulled out state), the ELR can be switched to the ALR.
The engagement relationship between the release gear and the ALR lever is set. Therefore, the usable length of the webbing varies, and a portion that is not always used (a portion from the switching position to the end portion of the webbing engaging with the winding shaft) remains as extra winding around the winding shaft. . For this reason, the cutting length of the webbing is set in consideration of the portion remaining as the extra winding, and the cutting length of the webbing becomes long, which is a factor of cost increase.

In consideration of the above facts, the present invention considers ELR to A
An object of the present invention is to obtain a webbing retractor capable of appropriately switching to LR and eliminating a portion that remains as extra winding.

[0009]

According to a first aspect of the present invention, there is provided a winding shaft for winding a webbing for restraining an occupant in layers by an urging force, and a locking means for stopping the rotation of the winding shaft in the webbing pull-out direction. And an ELR lever which is normally held at a position separated from the lock means and which engages with the lock means when the vehicle is suddenly decelerated to operate the lock means and stop the rotation of the winding shaft in the webbing withdrawing direction. By providing a lever main body that is swingably held around an axis and an engagement portion that is provided on the lever main body and that can be engaged with the lock means, by engaging the engagement portion with the lock means, An ALR lever selectively retained at either a first position for activating the locking means to stop the rotation of the winding shaft in the webbing pull-out direction or a second position for separating the engaging portion from the locking means; , A webbing take-up device having a switching means which is arranged coaxially with respect to the take-up shaft and is rotated at a reduced speed by rotation of the take-up shaft and selectively switches the position of the ALR lever when the take-up shaft rotates by a predetermined amount. Therefore, the ALR lever is held at the second position until the webbing is fully pulled out, and when the webbing is slightly wound from the fully pulled out state, the position of the ALR lever is changed from the second position to the first position. It is characterized by switching to.

According to a second aspect of the present invention, there is provided a winding shaft for winding the occupant restraining webbing in layers in a biasing force, and a lock means for stopping the rotation of the winding shaft in the webbing pull-out direction.
Normally, the ELR lever is held at a position separated from the lock means, and engages with the lock means when the vehicle suddenly decelerates to operate the lock means to stop the rotation of the winding shaft in the webbing pull-out direction; A lever main body that is swingably held by the lever main body; and an engaging portion that is provided on the lever main body and that can engage with the locking means, and the locking means is engaged with the locking means. And an ALR lever selectively retained at either a first position for stopping the rotation of the winding shaft in the webbing pull-out direction or a second position for separating the engaging portion from the locking means,
It is arranged coaxially with the winding shaft and rotates at a reduced speed due to the rotation of the winding shaft.
A webbing retractor having a switching means for selectively switching the position of the R lever, wherein the position of the ALR lever is switched from the second position to the first position until the webbing is fully drawn out. And a blocking means for allowing the position of the ALR lever to be switched from the second position to the first position when the webbing is slightly wound up from the fully drawn-out state.

According to a third aspect of the present invention, there is provided a winding shaft for winding the occupant restraining webbing in a layered manner by an urging force, and a lock means for stopping the rotation of the winding shaft in the webbing pull-out direction.
Normally, the ELR lever is held at a position separated from the lock means, and engages with the lock means when the vehicle suddenly decelerates to operate the lock means to stop the rotation of the winding shaft in the webbing pull-out direction; A lever main body that is swingably held by the lever main body; and an engaging portion that is provided on the lever main body and that can engage with the locking means, and the locking means is engaged with the locking means. And an ALR lever selectively retained at either a first position for stopping the rotation of the winding shaft in the webbing pull-out direction or a second position for separating the engaging portion from the locking means,
It is arranged coaxially with the winding shaft and rotates at a reduced speed due to the rotation of the winding shaft.
A webbing take-up device having switching means for selectively switching the position of the R lever, wherein an elastically deformable elastically deformable portion is provided at a part of the ALR lever, and the elastically deformable portion is in a state in which the webbing is fully drawn out. In the state immediately before, the position of the ALR lever is prevented from being switched from the second position to the first position by interfering with a part of the switching means and elastically deforming to get over the part of the switching means. , When the webbing is slightly wound from the fully drawn state, it is engaged with a part of the switching means to switch the position of the ALR lever from the second position to the first position.

[0012]

The operation of the present invention according to claim 1 is as follows.

The webbing retractor according to the present invention has an ELR
When used as, the webbing may be pulled out from the winding shaft and mounted. In this case, the ELR lever is held at a position separated from the lock means, and AL
The R lever is held in the second position. From this state, when the vehicle suddenly decelerates, the ELR lever is engaged with the lock means. Therefore, the locking means is activated to stop the rotation of the winding shaft in the webbing pull-out direction. Therefore, the webbing is not pulled out beyond the mounted state.

On the other hand, when the webbing retractor according to the present invention is used as an ALR, first, the entire webbing is pulled out. Here, conventionally, even if the webbing is fully pulled out in consideration of cutting error of the webbing, assembling error, etc., the ALR is set by the switching means before that.
Although the lever is configured to be switched from the second position to the first position, according to the present invention, the ALR lever is held at the second position until the full-pull-out state is reached, and the webbing is slightly moved from the full-pull-out state. When wound up, the position of the ALR lever is switched from the second position to the first position. Therefore, the switching from the ELR to the ALR is appropriately performed, and the extra winding on the winding shaft becomes zero, so that a useless portion is eliminated. In addition, this also prevents variations in the usable length of the webbing. As a result, the cutting length of the webbing can be shortened as much as that of the conventional one, by eliminating the extra winding portion, and the cost can be reduced.

The ALR lever moves from the second position to the first position.
When the position is switched to, the engaging portion of the ALR lever is engaged with the lock means. For this reason, the locking means is activated to stop the rotation of the winding shaft in the webbing pull-out direction. Therefore, the webbing cannot be pulled out any further.

The operation of the present invention according to claim 2 is as follows. It should be noted that portions common to the operation of the present invention described in claim 1 will be omitted.

According to the present invention, the second means of the ALR lever is controlled by the blocking means until the webbing is fully drawn out.
The switching operation from the position 1 to the first position is blocked. Therefore, since the ALR lever is still held in the second position, it is possible to fully pull out the webbing. Then, when the webbing is slightly wound up from the fully pulled out state, the blocking state of the switching operation of the ALR lever by the blocking means is released, and the switching operation from the second position to the first position is permitted. . Therefore, also in the present invention, it is possible to eliminate variations in the usable length of the webbing as well as zero extra winding around the winding shaft,
The cutting length of the webbing can be made shorter than in the conventional case, and the cost can be reduced.

The operation of the present invention according to claim 3 is as follows. It should be noted that portions common to the operation of the present invention described in claim 1 will be omitted.

According to the present invention, the ALR lever is provided with an elastically deformable portion on a part thereof, and the elastically deformable portion interferes with a part of the switching means immediately before the webbing is fully drawn out. It elastically deforms to overcome a part of the switching means. Therefore, the position of the ALR lever is prevented from being switched from the second position to the first position. Therefore, the entire amount of webbing can be pulled out. Then, when the webbing is slightly wound up from the fully pulled out state, a part of the switching means again interferes with the elastically deformable portion of the ALR lever. In this case, the elastically deformable portion becomes part of the switching means. Engagement switches the position of the ALR lever from the second position to the first position.
Therefore, also in the present invention, the extra winding around the winding shaft becomes zero and the variation in the usable length of the webbing can be eliminated, and the cutting length of the webbing can be shortened as compared with the conventional method to reduce the cost. You can

Further, according to the present invention, since the elastically deformable portion is provided on the ALR lever, there is an advantage that the number of parts does not increase.

[0021]

【Example】

[First Embodiment] The first embodiment will be described below with reference to FIGS. It should be noted that the first embodiment is defined by claim 1.
And corresponds to an embodiment of the present invention according to claim 2.

FIG. 1 is an exploded perspective view of the webbing retractor 10 according to this embodiment.

In this webbing retractor 10, the frame 12 is fixed to the vehicle body by mounting bolts (not shown). The frame 12 includes a pair of leg plates 12 from both sides.
A extends parallel to each other.

A winding shaft 14 is pivotally supported on these leg plates 12A. Further, a through hole 16 penetrating in the radial direction is formed in the center of the winding shaft 14,
One end of an occupant restraining webbing (not shown) is locked in the through hole 16. Further, one end of a spiral spring 18 is locked to the rear end of the winding shaft 14, and always urges the winding shaft 14 in the webbing winding direction (direction of arrow A in FIG. 2). Therefore, the webbing is usually wound in layers on the take-up shaft 14, and the occupant is pulled out by engaging the tongue plate attached to the end of the webbing with the buckle device attached to the vehicle body. The webbing can be installed.

A projecting portion 20 which is bifurcated is formed at the tip of the winding shaft 14, and a transmission member 22 is further fitted therein. A projection 24 projects from the center of the transmission member 22, and a pinion gear 26 is formed at the tip. Further, a through hole 30 is provided near the base of the protrusion 24.
Is provided, and when the transmission member 22 is fitted on the tip of the winding shaft 14, the projecting portion 20 penetrates the through hole 30 and is further projected from the transmission member 22. There is.

Around the protrusion 24, a pair of lock plates 32 forming a part of the lock means are arranged. Each of the lock plates 32 has a substantially C-shape with a substantially U-shaped cutout recess 34 formed in the center thereof, and the protrusion 2 of the winding shaft 14 is inserted into the cutout recess 34.
0 correspondingly rotates with the winding shaft 14. The width dimension of the cutout recess 34 is formed to be slightly larger than the width dimension of the protruding portion 20, and the lock plate 32 is rotatable relative to the winding shaft 14 by a predetermined angle.

A claw portion 36 is formed at one end of each of the lock plates 32, and corresponds to a lock tooth 38A of an internal tooth ratchet wheel 38 which is fixed to the leg plate portion 12A and constitutes a locking means together with the lock plate 32. There is.

Further, a pair of pins 40 project from the lock plate 32, respectively, and are inserted into the long holes 44 formed in the lock ring 42. The lock ring 42 is a large-diameter outer tooth ratchet wheel that is axially supported by the protrusion 24 of the transmission member 22, and is rotatable relative to the winding shaft 14. Ratchet teeth 46 are formed on the outer periphery of the lock wheel 42. The lock ring 42 is constantly urged in the webbing pull-out rotation direction of the winding shaft 14 (direction of arrow B in FIG. 2) by receiving the urging force of a torsion coil spring (not shown). Therefore, normally, the pin 4 of the lock plate 32 is
0 is located on one end side of the long hole 44, and the claw portion 36 of the lock plate 32 is in a state of being separated from the lock teeth 38A. However, when relative rotation occurs between the lock wheel 42 and the take-up shaft 14 that rotates in the webbing pull-out direction, a rotational delay occurs against the biasing force of the torsion coil spring,
When this rotation delay occurs, the pin 40 of the lock plate 32 is guided to the other end side of the elongated hole 44, so that the claw portion 36 meshes with the lock tooth 38A.

A sensor holder 62 is fixed to the leg plate portion 12A immediately below the lock wheel 42, and an ELR lever 64,
An acceleration sensor 66 and an ALR lever 68 are attached respectively.

The ELR lever 64 is substantially L-shaped, and is rotatably supported by a support shaft 70 formed to project at one end of the sensor holder 62. The ELR lever 64 is provided with an arm 72, and the tip of the arm 72 is an engaging portion 74 that bends upward and is rotated when the acceleration sensor 66 is actuated to rotate the ratchet teeth of the lock wheel 42. The lock wheel 42 is engaged with the wheel 46 to stop the rotation of the lock wheel 42.

The acceleration sensor 66 has a cylindrical mounting protrusion 8
The case 78 having the number 0 is provided.
Is attached by being fitted into the receiving portion 82 of the sensor holder 62. Further, a conical receiving portion 84 having a truncated conical concave surface is formed on the bottom of the case 78, and a ball 86 arranged in the conical receiving portion 84 climbs up in the conical receiving portion 84 during acceleration. ing.

The actuator 88 pivotally supported by the acceleration sensor 66 has one end mounted on the ball 86, and when pushed up by the ball 86, the other end is mounted on the ELR lever 6.
4 is rotated around the support shaft 70 so that the engaging portion 74 of the ELR lever 64 meshes with the ratchet teeth 46 of the lock wheel 42.

On the other hand, the ALR lever 68 is the lever body 1.
It is equipped with 00. A small hole 102 is formed in the upper end portion of the lever body 100, and a support shaft 104 projecting from one end of the sensor holder 62 is inserted into the small hole 102. As a result, the ALR lever 68 moves the support shaft 104
It is rotatably supported by. Also, the lever body 100
A switching claw 106 is integrally formed at the upper end portion of the so as to project obliquely downward. Further, a claw-shaped step portion is formed on the side surface of the lower end portion of the lever body 100,
This step is the engaging claw 108. This engaging claw 10
8 corresponds to the ratchet teeth 46 of the lock wheel 42,
It is adapted to mesh with the ratchet teeth 46 of the lock wheel 42 in a predetermined case.

Further, a cylindrical locking projection 110 is formed on the lower end of the lever body 100, and one end of a compression coil spring 114 is locked to the locking projection 110. Further, the other end of the compression coil spring 114 is brought into contact with and locked to the bottom of the U-shaped spring accommodating portion 116 formed in the sensor holder 62. For this reason, the compression coil spring 114 operates the ALR lever 68.
The locking projection 110 of the ALR lever 68, which receives the biasing force of the compression coil spring 114, is located on the right side of the drawing or on the left side of the drawing with respect to the line segment connecting the support shaft 104 and the other end of the compression coil spring 114. Depending on the position, the first position (the position shown in FIG. 4) in which the engagement claw 108 meshes with the ratchet teeth 46 of the lock wheel 42 or the second position (the second position in which the engagement claw 108 is separated from the ratchet teeth 46 of the lock wheel 42). A snap action for selectively holding the ALR lever 68 is formed at any one of the positions shown in FIG. The compression coil spring 114 does not necessarily have to be used, and a snap action can be configured by a leaf spring or the like, and the ALR lever 68 can be set to the first position, the second position.
Any biasing means may be used as long as it is selectively held at the position.

The switching claw 106 of the ALR lever 68 corresponds to the switching cam 118 axially supported by the protrusion 24 of the transmission member 22. The switching cam 118 is provided with a thin and bottomed cylindrical base 120, and a through hole 122 into which the protrusion 24 of the transmission member 22 is inserted is formed in the shaft core of the base 120. Further, the inner teeth 12 are formed on the inner peripheral surface of the base 120.
4 is formed, and meshes with the pinion gear 26 via the gear 126. The gear 126 is a large-diameter gear portion 128.
Is a two-stage gear integrally formed with a small-diameter gear portion 130, is rotatably supported by a cover 132, the pinion gear 26 meshes with the large-diameter gear portion 128, and the small-diameter gear portion 130 has internal teeth 124. It is in mesh. Therefore, the switching cam 118 decelerates and rotates when the winding shaft 14 rotates and rotates in the direction opposite to the rotating direction of the winding shaft 14. It should be noted that the switching cam 118 is configured to rotate approximately once from the fully wound state of the webbing to the fully pulled out state.

Further, a 1/4 disc-shaped flange 134 is integrally extended in the radial direction in a predetermined range on the outer peripheral portion of the base portion 120 of the switching cam 118. A partition wall 136 is integrally formed on the peripheral edge of the flange 134.
One of the circumferential end portions of 36 serves as a first switching portion 138. In addition, at the other end of the partition wall 136 in the circumferential direction, a second claw-shaped switching portion 140 protruding outward in the radial direction is formed.
Are formed.

The details are as follows. That is,
First switching unit 1 when switching cam 118 rotates
The tip of the switching claw 106 of the ALR lever 68 is located on the movement loci of the 38 and the second switching unit 140. Therefore, when the switching cam 118 rotates a predetermined amount in the direction of arrow A in FIG. 2, the second switching portion 140 comes into contact with the tip of the switching pawl 106 of the ALR lever 68, and the ALR lever 68 is moved from the second position. Switch to the first position. The timing at this time (the timing at which the second switching portion 140 comes into contact with the switching pawl 106 to reverse the biasing direction of the compression coil spring 114 from the second position side to the first position side) is the same as that of the webbing. It is set to the state immediately before the full quantity withdrawal (a state slightly before the full quantity withdrawal state).

On the other hand, when the switching cam 118 rotates a predetermined amount in the direction of arrow B in FIG. 4, the first switching portion 138 contacts the tip of the switching pawl 106 of the ALR lever 68, and the ALR lever 68 moves to the first position. The position is switched to the second position. The timing at this time (the timing at which the first switching portion 138 contacts the switching claw 106 and the biasing direction of the compression coil spring 114 is reversed from the first position side to the second position side) is the timing of the webbing. It is set to the state immediately before full volume winding (a state slightly before the full volume winding state).

Further, in this embodiment, the step portion 1 having a predetermined shape is provided below the tip of the switching claw 106 of the ALR lever 68.
42 is formed. The step cam 142 has a switching cam 1
The distal end portion of the second switching portion 140 of 18 is allowed to enter, and as shown in FIG. 3, the second switching portion 140 of the switching cam 118 causes the urging direction of the ALR lever 68 to the second position side. From the first position to the second position
The tip end of the switching unit 140 of FIG. 2 once enters the step 142 and stops the reversing operation of the ALR lever 68 immediately before its completion. As a result, the ALR lever 68
The engaging claw 108 of is configured to be held at a second position separated from the ratchet teeth 46 of the lock wheel 42. During that time, the entire amount of the webbing can be pulled out while changing the contact angle of the second switching portion 140 to the step portion 142.

The operation of this embodiment will be described below. In a state before the occupant wears the webbing, the webbing is fully wound around the winding shaft 14 by the urging force of the mainspring 18. Therefore, the ALR lever 68 is held at the second position by the first switching portion 138 of the switching cam 118, and the engaging claw 108 is separated from the ratchet teeth 46 of the lock wheel 42. That is, the webbing retractor 10 in this state is in a use mode as an ELR.

From this state, the occupant can attach the webbing by holding the tongue plate against the urging force of the main spring 18 and pulling out the webbing. By engaging the tongue plate with the buckle device, the occupant can be put on the webbing and the driving posture can be freely changed.

On the other hand, when the vehicle suddenly decelerates, the ball 86 inertially moves and the actuator 8 moves, as shown in FIG.
8 is pushed up and the ELR lever 64 is rotated around the support shaft 70 so that the engaging portion 74 is engaged with the ratchet teeth 46. Therefore, the rotation of the lock wheel 42 in the webbing pull-out direction is stopped.

At this time, since the occupant moves by inertia, the webbing is pulled out from the take-up shaft 14, and the take-up shaft 14 rotates in the webbing take-out direction. Therefore, relative rotation occurs between the winding shaft 14 and the lock wheel 42. By this relative rotation, the pin 40 is guided by the long hole 44 of the lock ring 42 to move the lock plate 32 that rotates together with the winding shaft 14, and the pawl portion 36 moves the lock teeth 3 of the internal ratchet wheel 38.
The rotation of the take-up shaft 14 meshing with 8A is prevented. As a result, the occupant is securely restrained by the webbing.

When the occupant is wearing the webbing as described above, the positional relationship between the switching cam 118 and the ALR lever 68 is as shown in FIG.
The engaging claw 108 of is separated from the ratchet teeth 46 of the lock wheel 42. That is, the ALR lever 68 is held at the second position by the biasing force of the compression coil spring 114.

Here, in the webbing retractor 10 according to the present embodiment, it is possible to switch to a usage mode as an ALR if necessary (for example, when a luggage such as a child seat is fixed to a passenger seat). . This is done by pulling out the webbing.

From the state shown in FIG. 2, the webbing is the winding shaft 1.
When pulled out from No. 4, the switching cam 118 is decelerated via the gear 126 and rotates in the opposite direction. For this reason,
The switching cam 118 has a webbing winding direction (arrow A in FIG. 3).
Direction). Along with this, the second of the switching cam 118
When the switching portion 140 of (1) moves in the same direction and the webbing is in a state immediately before the full amount is pulled out, the tip of the switching pawl 106 of the ALR lever 68 is pushed up from below. This gives A
The LR lever 68 rotates around the support shaft 104 and the biasing direction thereof is reversed. Therefore, the engaging claw 108 of the ALR lever 68 tries to mesh with the ratchet teeth 46 of the lock wheel 42, but at this time, the second engaging portion 14 of the switching cam 118 is engaged.
0 is engaged with the step portion 142 of the switching claw 106 of the ALR lever 68. Therefore, the engaging claw 108 of the ALR lever 68 is held in a state immediately before being engaged with the ratchet teeth 46 of the lock wheel 42. That is, although the biasing direction for the ALR lever 68 is reversed from the second position side to the first position side, the engagement claw 108 of the ALR lever 68 is still in the second position.
Held in position. Therefore, the webbing can be pulled out so that the entire amount of the webbing is pulled out.

After the webbing is fully drawn out, when the webbing is slightly wound around the winding shaft 14 by the urging force of the mainspring 18, the switching cam 118 is in the direction opposite to the above-mentioned direction, that is, the webbing drawing-out rotation direction (Fig. 4 arrow B direction)
Rotate slightly to. Therefore, the second switching portion 140 of the switching cam 118 also slightly rotates in the same direction. Therefore, the second switching portion 140 is the step portion 1 of the switching pawl 106 of the ALR lever 68.
Remove from 42. As a result, the engaging claw 108 of the ALR lever 68 meshes with the ratchet teeth 46 of the lock wheel 42 by the urging force of the compression coil spring 114. As a result,
The rotation of the lock wheel 42 in the webbing pull-out direction is stopped.
That is, the usage mode of the webbing retractor 10 is ELR.
To ALR.

In the state switched to ALR, the rotation of the winding shaft 14 in the webbing drawing-out direction is prevented, but the webbing winding direction is free to rotate. Therefore, after the operation for fixing the luggage such as the child seat with the webbing is performed, the surplus portion of the webbing can be wound up by the biasing force of the mainspring spring 18, and this can be securely fixed to the seat.

When switching from ALR to ELR, if the webbing is fully wound again, the ALR lever 68 is moved by the first switching portion 138 immediately before that.
The switching claw 106 of the
Switched to LR.

Thus, in this embodiment, the ALR lever 6
When 8 is switched from the second position to the first position,
The second switching portion 140 of the switching cam 118 is connected to the ALR lever 6
8 is engaged with the step portion 142 of the switching claw 106 to prevent the engagement claw 108 of the ALR lever 68 from meshing with the lock wheel 42, so that the entire webbing can be pulled out during this period. Therefore, the usable length of the webbing does not vary, and the excess winding around the winding shaft 14 becomes zero, so that the cutting length of the webbing can be shortened. Therefore, cost reduction can be achieved.

Moreover, after the entire amount of the webbing is pulled out, the webbing is slightly wound up to obtain AL.
Since the engagement state between the step portion 142 of the R lever 68 and the second switching portion 140 of the switching cam 118 is released, the switching from ELR to ALR is reliable.

Further, in this embodiment, the ALR lever 68 having the stepped portion 142 and the existing switching cam 118 can obtain the above-described actions and effects, so that the number of parts is not increased.

Furthermore, in this embodiment, the biasing direction of the ALR lever 68 is reversed from the second position side to the first position side, and then the ALR lever 68 is held at the second position. Therefore, the subsequent switching operation from ELR to ALR is reliable. [Second Embodiment] Next, a second embodiment will be described with reference to FIGS. The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. The second embodiment also corresponds to an embodiment of the present invention described in claims 1 and 2.

As shown in FIG. 5, in this webbing retractor 150, the ALR that tries to switch from the second position to the first position by using the friction piece 152.
A feature is that the lever 68 is held in the second position.

That is, the lock wheel 42 and the switching cam 118
A rotating wheel 154 is disposed between the and. An elastically deformable engaging claw 156 is provided on the shaft core of the rotating wheel 154.
Are formed together with the through hole 158.
8 into the concave portion 16 formed in the protrusion 24 of the transmission member 22.
0 is inserted and arranged. As a result, the rotating wheel 15
4 is adapted to rotate integrally with the winding shaft 14. A torsion coil spring 162 is interposed between the rotary wheel 154 and the lock wheel 42 (the coil portion of the torsion coil spring 162 is loosely fitted to the pin 164, and one end thereof is adjacent to the pin 164. The locking wheel 166 is locked by the locking portion 166, and the other end is locked by the receiving portion 168 of the rotating wheel 154), thereby always urging the lock wheel 42 in the webbing pull-out rotation direction.

A groove 170 is formed around the entire circumference of the rotary wheel 154 described above, and a friction spring 152 is attached to the groove 170. The friction spring 152 has a holding portion 15 that is pressed against the groove 170 of the rotating wheel 154 by an elastic restoring force.
2A, a blocking portion 152B provided by bending a part of the holding portion 152A into a rectangular shape, and an abutting portion provided on the opposite side of the blocking portion 152B and bent in a V shape on opposite sides. 152C is a leaf spring member.

At a predetermined position of the cover 132, a pair of stopper pins 172 are provided upright corresponding to the contact portion 152C of the friction spring 152. And
The contact portion 152C of the friction spring 152 is located between these stopper pins 172. Therefore, the friction spring 152 is
Although it rotates in the same direction together with the rotating wheel 154 due to the frictional force generated between the stopper pin 172 and the rotating wheel 154, the range of movement thereof is restricted between the pair of stopper pins 172.

Friction spring 1 having the above-mentioned structure
When the rotary wheel 154 is rotating in the webbing pull-out direction, the contact portion 1 is attached to one stopper pin 172.
When 52C abuts, blocking portion 152B is ALR
When the engaging wheel 108 of the lever 68 is positioned on the movement locus (the state shown in FIGS. 6 and 7) and the rotating wheel 154 is rotating in the webbing winding direction, the other stopper pin 17
The contact portion 152C comes into contact with the contact portion 2 to prevent the blocking portion 15
2B retracts from the movement locus of the engaging claw 108 of the ALR lever 68 (state shown in FIG. 8).

The operation of this embodiment will be described below. Since the entire operation is basically the same as that of the above-mentioned embodiment, a different part will be mainly described.

In the webbing retractor 10 as an ELR, when the vehicle suddenly decelerates, the above-mentioned operation is performed,
As shown in FIG. 6, the engaging portion 74 of the ELR lever 64 meshes with the ratchet teeth 46 of the lock wheel 42. Therefore,
The winding shaft 14 is prevented from rotating in the webbing pull-out direction, and the occupant is restrained by the webbing. At this point in time, since the winding shaft 14 is in the rotating state in the webbing pull-out direction, the contact portion 152C of the friction spring 152 is
Is in contact with one stopper pin 172. Therefore, the blocking portion 152B of the friction spring 152
Is located on the movement locus of the engaging claw 108 of the ALR lever 68. However, since the positional relationship between the switching cam 118 and the ALR lever 68 is as shown in FIG. 6 when the occupant is wearing the webbing, the engaging claw 108 of the ALR lever 68 is separated from the ratchet teeth 46 of the lock wheel 42. It is separated. That is, the ALR lever 68 is held at the second position by the biasing force of the compression coil spring 114.

Next, a case where the webbing retractor 10 as an ELR is used as an ALR will be described. When the webbing is pulled out from the above-mentioned state, the switching cam 11
8 is decelerated via gear 126 and rotates in the opposite direction. Therefore, the switching cam 118 rotates in the webbing winding direction (direction of arrow A in FIG. 7). Along with this, the second switching portion 140 of the switching cam 118 moves in the same direction, and when the webbing is in a state immediately before the full amount is pulled out, the tip of the switching pawl 106 of the ALR lever 68 is pushed up from below. As a result, the ALR lever 68 rotates around the support shaft 104, and the urging direction thereof is reversed. Therefore, ALR
The engaging claw 108 of the lever 68 tries to mesh with the ratchet teeth 46 of the lock wheel 42, but at this time, the blocking portion 152B of the friction spring 152 has already been moved to the ALR lever 6.
Since the eight engaging claws 108 are located on the movement locus, the engaging claws 108 contact the blocking portion 152B. Therefore, AL
The engaging claw 108 of the R lever 68 is held in a state immediately before being engaged with the ratchet teeth 46 of the lock wheel 42. That is,
Although the biasing direction of the ALR lever 68 is reversed from the second position side to the first position side, the engaging claw 108 of the ALR lever 68 is still held at the second position. Therefore, the webbing can be pulled out so that the entire amount of the webbing is pulled out.

After the webbing is fully pulled out, when the webbing is slightly wound around the winding shaft 14 by the urging force of the mainspring 18, the switching cam 118 is in a direction opposite to the above-mentioned direction, that is, the webbing pulling-out rotation direction (Fig. 8 arrow B direction)
Rotating wheel 154 rotates in the webbing take-up rotation direction (the direction of arrow A in FIG. 8) while rotating slightly, and thus friction spring 152 rotates until the abutting portion 152C abuts on the other stopper pin 172 by a frictional force. . Therefore, the blocking portion 152B of the friction spring 152 retracts from the movement locus of the switching pawl 106 of the ALR lever 68. As a result, the engaging claw 108 of the ALR lever 68 meshes with the ratchet teeth 46 of the lock wheel 42 by the urging force of the compression coil spring 114. As a result, the rotation of the lock wheel 42 in the webbing pull-out direction is stopped. That is, the usage mode of the webbing retractor 10 is switched from ELR to ALR.

In the case of switching from ALR to ELR, if the webbing is fully wound again, the ALR lever 68 is moved by the first switching portion 138 immediately before that.
The switching claw 106 of the
Switched to LR.

Thus, in this embodiment, the ALR lever 6
When 8 is switched from the second position to the first position,
The lock wheel 42 is brought into contact with the engaging claw 108 of the switching cam 118.
Friction spring 152 for preventing engagement with
Since the above is provided, the webbing can be fully drawn out during this period. Therefore, also in this embodiment, the usable length of the webbing does not vary as in the above-described embodiment, and the excess winding on the winding shaft 14 becomes zero, so that the cutting length of the webbing is reduced. Can be shortened. Therefore, cost reduction can be achieved. Moreover,
After the entire amount of the webbing is pulled out, the webbing is wound up a little, so that the engaging claw 108 of the ALR lever 68 and the blocking portion 15 of the friction spring 152 are wound.
Since 2B is retracted, switching from ELR to ALR is sure.

Further, also in this embodiment, the urging direction for the ALR lever 68 is reversed from the second position side to the first position side, and then the ALR lever 68 is held at the second position. Therefore, the subsequent switching operation from ELR to ALR is reliable. [Third Embodiment] Next, a third embodiment will be described with reference to FIGS. The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In addition, the third embodiment includes claims 1 and 3.
It corresponds to an embodiment of the invention described.

As shown in FIGS. 9 to 11, in the webbing retractor 200, the switching claw 204 of the ALR lever 202 is curved with a relatively narrow width and is elastically deformable. Further, a columnar locking projection 206 is integrally formed at the tip of the switching claw 204 toward the switching cam 118.

On the other hand, on the outer peripheral portion of the switching cam 118, the first
The switching unit 208 and the second switching unit 210 are provided upright at a predetermined interval. In addition, these first switching unit 2
The 08 and the second switching section 210 are both narrow-width projections. Further, the first switching unit 208 and the second switching unit 210 are provided at positions where they interfere with the switching claw 204 of the ALR lever 202 when the switching cam 118 rotates.

According to the above configuration, as shown in FIG.
In the usage mode as the ELR, since the second switching portion 210 of the switching cam 118 does not interfere with the locking projection 206 of the switching claw 204 of the ALR lever 202, the ALR lever 20
2 is the second due to the biasing force of the compression coil spring 114.
Held in position.

When the webbing is pulled out from this state to switch to the usage mode as the ALR, as shown in FIG. 10, one side surface of the second switching portion 210 of the switching cam 118 is in a state immediately before the full amount of the webbing is pulled out. It interferes with the locking projection 206 of the switching claw 204 of 202. Then, when the webbing is still pulled out and the full amount is pulled out, A
When the locking projection 206 of the switching claw 204 of the LR lever 202 is pressed against one side surface of the second switching portion 210, the switching claw 204 is elastically deformed toward the lever main body 100 side (state shown by a solid line), and Overcoming the switching unit 208 of No. 2 (state shown by two-dot chain line).

After that, as shown in FIG. 11, the webbing is slightly wound, so that the second switching portion 210 is wound.
Rotates in the opposite direction to the case described above, so that the locking projection 206 of the switching claw 204 of the ALR lever 202 is pulled in the same direction by the second switching portion 210. Therefore, the urging direction of the compression coil spring 114 is reversed and the ALR
The lever 202 is switched from the second position to the first position. As a result, the engaging claw 10 of the ALR lever 202
8 meshes with the ratchet teeth 46 of the lock wheel 42, and the AL
The mode of use as R is switched.

Therefore, also in this embodiment, the usable length of the webbing does not fluctuate as in the above-mentioned embodiments, and the extra winding around the winding shaft 14 becomes zero, so that the webbing is cut. The length can be shortened.
Therefore, cost reduction can be achieved.

Moreover, after the entire amount of the webbing is pulled out, the webbing is slightly wound up to obtain AL.
Since the locking projection 206 of the switching claw 204 of the R lever 68 is locked to the second switching portion 210 of the switching cam 118 to switch the ALR lever 68 from the second position to the first position, the ELR Switching to ALR is sure.

Further, similarly to the first embodiment, the number of parts does not increase. In the above-described embodiment, the ELR lever 64 is swung when the vehicle suddenly decelerates to lock the lock wheel 42.
The present invention is applied to the webbing retractor 10, 150, 200 of the type in which the rotation of the webbing withdrawing direction is stopped to stop the rotation of the winding shaft 14 from the webbing withdrawing direction, but the present invention is not limited to this. In addition to the structure, the rotation of the winding shaft 14 is prevented after the rotation of the winding shaft 14 during the sudden deceleration of the vehicle is blocked, and thus the winding shaft 14 itself is swung, so that the intermediate portion of the webbing is instantly clamped by the clamp device and the middle of the webbing It is also possible to apply the present invention to a webbing retractor having a structure for preventing the extension of the portion.

[0074]

As described above, the webbing retractor according to the present invention has an excellent effect that the switching from ELR to ALR can be surely performed and the productivity can be improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a webbing retractor according to a first embodiment.

FIG. 2 is an operation explanatory view showing a mode of use of the webbing retractor shown in FIG. 1 as an ELR.

FIG. 3 is an operation explanatory view showing a state when the webbing retractor shown in FIG. 1 is switched from ELR to ALR.

FIG. 4 is an operation explanatory view showing a state in which the webbing retractor shown in FIG. 1 is switched to a use mode as an ALR.

FIG. 5 is an exploded perspective view of a webbing retractor according to a second embodiment.

6 is an operation explanatory view showing a mode of use of the webbing retractor shown in FIG. 5 as an ELR.

7 is an operation explanatory view showing a state when the webbing retractor shown in FIG. 5 is switched from ELR to ALR.

8 is an operation explanatory view showing a state in which the webbing retractor shown in FIG. 5 is switched to a use mode as an ALR.

FIG. 9 is an ELR of the webbing retractor according to the third embodiment.
FIG. 8 is an operation explanatory view showing a usage mode as a.

10 is an ELR webbing take-up device shown in FIG.
FIG. 9 is an operation explanatory diagram showing a state when switching from ALR to ALR.

FIG. 11 is an ALR of the webbing retractor shown in FIG.
FIG. 7 is an operation explanatory view showing a state in which the mode is switched to the usage mode as described above.

[Explanation of symbols]

 10 webbing take-up device 14 take-up shaft 18 spring spring 32 lock plate (locking means) 38 internal tooth ratchet wheel (locking means) 42 lock wheel (locking means) 64 ELR lever 66 acceleration sensor 68 ALR lever 114 compression coil spring 118 switching Cam (switching means) 138 First switching portion 140 Second switching portion (blocking means [claim 2]) 142 Step portion (blocking means [claim 2]) 150 Webbing take-up device 152 Friction piece (blocking means [blocking means [blocking means [blocking means]) (Claim 2)) 172 Stopper pin (blocking means [Claim 2]) 200 Webbing retractor 202 ALR lever 204 Switching claw (elastic deformation section [Claim 3]) 208 First switching unit 210 Second switching unit

Claims (3)

[Claims] 1. A winding shaft for winding a webbing for restraining an occupant into layers by an urging force, a locking means for stopping the rotation of the winding shaft in the webbing drawing-out direction, and usually a position separated from the locking means. An ELR lever that is held and that engages with the locking means when the vehicle suddenly decelerates to actuate the locking means to stop the rotation of the take-up shaft in the webbing pull-out direction; and a lever body that is swingably held around the support shaft. And a engaging portion that is provided on the lever main body and that can engage with the locking means. By engaging the engaging portion with the locking means, the locking means is actuated to pull out the webbing of the winding shaft. An ALR lever that is selectively held in either a first position that stops rotation or a second position that separates the engaging portion from the locking means, and is arranged coaxially with the winding shaft. Together with AL when the winding shaft rotates at a reduced speed by rotating, rotated a predetermined amount
A webbing take-up device having a switching means for selectively switching the position of the R lever, wherein the ALR lever is held at the second position until the full amount of the webbing is pulled out, and the webbing is slightly pulled out from the fully pulled out state. A webbing take-up device, characterized in that the position of the ALR lever is switched from the second position to the first position when wound up. 2. A take-up shaft for taking up a webbing for restraining an occupant in layers by an urging force, a lock means for stopping rotation of the take-up shaft in a webbing pull-out direction, and a position normally separated from the lock means. An ELR lever that is held and that engages with the locking means when the vehicle suddenly decelerates to actuate the locking means to stop the rotation of the take-up shaft in the webbing pull-out direction; and a lever body that is swingably held around the support shaft. And a engaging portion that is provided on the lever main body and that can engage with the locking means. By engaging the engaging portion with the locking means, the locking means is actuated to pull out the webbing of the winding shaft. An ALR lever that is selectively held in either a first position that stops rotation or a second position that separates the engaging portion from the locking means, and is arranged coaxially with the winding shaft. Together with AL when the winding shaft rotates at a reduced speed by rotating, rotated a predetermined amount
A webbing take-up device having a switching means for selectively switching the position of the R lever, wherein the position of the ALR lever is switched from the second position to the first position until the webbing is fully drawn out. And a blocking means for allowing the position of the ALR lever to be switched from the second position to the first position when the webbing is slightly wound up from the fully drawn-out state. Take-up device. 3. A take-up shaft for taking up a webbing for restraining an occupant in layers in a biasing force, a locking means for stopping the rotation of the take-up shaft in the webbing pull-out direction, and usually a position separated from the locking means. An ELR lever that is held and that engages with the locking means when the vehicle suddenly decelerates to actuate the locking means to stop the rotation of the take-up shaft in the webbing pull-out direction; and a lever body that is swingably held around the support shaft. And a engaging portion provided on the lever main body, the engaging portion being engageable with the locking means, and engaging the engaging portion with the locking means to activate the locking means to pull out the webbing of the winding shaft. An ALR lever that is selectively held at either a first position that stops rotation or a second position that separates the engaging portion from the locking means, and is arranged coaxially with the winding shaft. Together with AL when the winding shaft rotates at a reduced speed by rotating, rotated a predetermined amount
A webbing take-up device having a switching means for selectively switching the position of the R lever, wherein an elastically deformable elastically deformable portion is provided at a part of the ALR lever, and the elastically deformable portion is in a state in which the webbing is fully drawn out. In the state immediately before, the position of the ALR lever is prevented from being switched from the second position to the first position by interfering with a part of the switching means and elastically deforming to get over the part of the switching means. , When the webbing is slightly wound from the fully drawn state, it is engaged with a part of the switching means to switch the position of the ALR lever from the second position to the first position. Device.