JPH0456658A - Seat belt tension device - Google Patents

Abstract

PURPOSE:To improve the constraining performance of a seat belt to a passenger by providing a release lever operated by a weight at the time of emergency so as to allow a lock lever to be independently rotated into its non-lock position, thereby transmitting the power of a power accumulating device to a buckle without delay at the time of emergency. CONSTITUTION:A rotary latch 33 rotatable between an operating position of constraining the supporting member 2 of a buckle 1 in its protruding position and an non-operating position is pivotally supported on a frame 8, and a lock lever 34 rotatable between a lock position of locking the rotary latch 33 into its operating position and a non-lock position is also pivotally supported on the frame 8. The lock lever 34 is energized/held into its lock position by a lock spring 35. A release lever 36, rotatable between a holding position of being placed opposedly to the lock lever 34 and a release position, for allowing the lock lever 34 to be rotated independently into its non-lock position D, is further pivotally supported on the frame 8. This release lever 36 is energized/held into its holding position by a return spring 38 and moved into a release position by a weight 37, reacting to an emergency condition.

Description

Detailed Description of the Invention A1 Object of the Invention (1) Industrial Field of Application The present invention relates to a seat belt tensioning device mainly used in automobiles, and in particular, the present invention relates to a seat belt tensioning device mainly used in automobiles, and in particular, the support member of the buckle to which the seat belt is connected is connected to The frame is provided with a force storage device that is movably guided by the frame from a seat belt position to a retracted position that applies tension to the seat belt, and urges the support member toward the retracted position via a cable; The device includes a locking device that normally locks the force storage device in the protruding position of the supporting member, but releases the lock in an emergency, and a locking device that allows the supporting member to move to the retracted position, but in the opposite direction. The present invention relates to an improvement in which a unidirectional movement prevention device is provided to prevent movement.

(2) Conventional seatbelt tensioning devices are known from, for example, Japanese Unexamined Patent Application Publication No. 1996-
As disclosed in Figure 1 of Publication No. 164651, it is activated in emergencies such as sudden braking of a vehicle or a collision to remove slack in the seat belt caused by stretching the seat belt itself or tightening it with a tractor. It is possible to improve the restraint for the occupant. In addition, with a type in which the force storage device is connected to the support member of the buckle via a cable, there is a high degree of freedom in the layout of the force storage device, which requires a relatively large installation space. advantageous to

(3) Problems to be Solved by the Invention However, in conventional devices of this type, as shown in FIG. Since the power storage device is directly locked by the device, the cable connecting the support member and the power storage device is somewhat relaxed. Therefore, in an emergency, when the locking device is released and the force of the storage device acts as a tension force on the buckle via the cable, the tension is transmitted to the buckle only for the time that the slack in the cable is removed. will be delayed.

The present invention has been made in view of the above points, and in an emergency, the power of the power storage device is transmitted to the buckle without time delay.
It is an object of the present invention to provide the seat belt tensioning device that can further improve the restraining performance of the seat belt for the occupant.

B0 Structure of the Invention (1) Means for Solving the Problems In order to achieve the above object, the present invention provides an operating position that is pivotally supported by a frame and restrains the support member in a protruding position, and a release position of the support member. a rotary latch pivotable to the frame between a locking position locking the rotary latch in its activated position and an unlocked position disengaging from the rotary latch; a lock spring capable of biasing and holding the lock lever in its locked position; a holding position in which the lock lever is pivotally supported by a frame and is opposed to the lock lever occupying the locked position; and a lock spring capable of biasing and holding the lock lever in its locked position; a release lever capable of rotating between a release position and a release position, and allowing the lock lever to rotate independently to its unlocked position;
The first feature is that the locking device is composed of a return spring that biases and holds the release lever in its holding position, and a weight that moves the release lever to its release position in response to an emergency situation.

In addition, the "route" in the present invention refers to wires, cables,
A general term for belts, lobes, etc. that are non-stretchable and flexible.

Further, in addition to the first feature, the present invention provides a gap between the lock lever occupying the lock position and the release lever occupying the holding position so that the release lever may become clogged while moving toward the release position. is the second feature.

Furthermore, in addition to the first feature, the lock lever is provided with a roller that engages with the engagement surface of the rotary latch to hold the rotary latch in its operating position, and the lock lever is provided with a roller that engages with the engagement surface of the rotary latch to hold the rotary latch in its operating position. The third feature is that it is formed into an arcuate surface centered on the pivot.

(2) Effect According to the first feature, in normal times, the support member of the buckle is directly locked by the rotating latch of the locking device.
The power of the force storage device can put the cable under tension even during normal times.

When the weight senses an emergency condition and rotates the release lever from its holding position toward its release position, the release lever
rotates the lock lever toward its unlocked position, but even if the release lever does not rotate the lock lever to its unlocked position, if the lock lever disengages from the rotating latch, the lock lever will no longer rotate. Since the locking function on the latch is lost, the strong moment acting on the rotary latch from the force storage device causes the rotary latch to rapidly pivot to the inoperative position, forcing the locking lever to the unlocked position.

The rotation of the lock lever to the unlocked position by the rotational latch is performed without any interference from the release lever, so the rotational latch can be rotated by the release lever.
It can be quickly rotated to the non-operating position without being resisted by the repulsive force of the return spring or the inertial force of the weight.

As a result, the rotating latch releases the support member and, together with the fact that the cable is already under tension, the force of the storage device quickly pulls the support member into the frame, lowering the buckle and attaching it to the seat belt. Can apply tension accurately.

According to the second feature of the present invention, in an emergency, when the weight rotates the release lever from the holding position to the release position, the release lever is resisted equally by the lock lever while closing the gap with the lock lever. When the gap is closed, a striking force is applied to the lock lever, so this hammer action moves the lock lever to the non-locking position against the frictional resistance of the lever pivot and the force of the lock spring. It can be rotated reliably.

Furthermore, according to a third feature of the invention, the moment acting on the rotary latch from the force storage device via the cable during normal times acts on the locking lever as a simple tensile or compressive force. Therefore, the set load of the lock spring of the long lever can be set to a relatively small value that simply holds the lock lever in the locked position without being affected by external disturbances such as vibrations. This means that in an emergency, the resistance when the release lever rotates the lock lever toward the unlocked position is relatively small.

(3) Example Hereinafter, an example of the present invention will be described with reference to the drawings.

First, in FIGS. 1 and 2, a buckle 1 for connecting a seatbelt connection fitting is fixed to the upper end of a support rod 2 as a support member. The support rod 2 is constructed in a flexible manner, the main elements being a metal cable 3 folded back into a U-shape at the lower part, and a synthetic resin tube 4 covering the cable 3. A circular cable terminal 5 is fitted into the lower folded portion of the cable 3, and a support plate 6 is fastened thereto.

As shown in FIGS. 2A to 4, the support plate 6 has upstanding walls 6a and 6b on both front and rear sides and on the lower side.

The left and right upright walls 6a and 6b have their upper ends constricted to clamp the cable 3 in cooperation with the cable terminal 5, and the lower upright wall 6C has a wire 7 as a cable. The upper terminal 7a of is connected.

The support plate 6 is inserted into a sheath-like frame 8 so as to be movable up and down, and when the support plate 6 is lowered, the support rod 2 is drawn into the frame 8, and the seat belt connected to the buckle 1 is tensioned. .

In order to guide the lifting and lowering of the support plate 6, a retaining pin 9 protruding from one side of the cable terminal 5 is slidably engaged with a vertically long guide groove 10 formed on one side wall of the frame 8. .

The frame 8 is divided into a channel-shaped frame main body 8a and a side plate 8b that closes the open side of the frame main body 8a. Both 8a and 8b are bonded to each other by penetrating through and caulking.

1 and 2 again, a pair of front and rear mounting flanges 12.13 are integrally provided at the lower part of the frame body 8a, and bolt holes 14.14 of these mounting flanges 12, 13 are integrally provided.
The frame 8 is fixed to an anchor portion of a seat or floorboard inside the vehicle by bolts 15° 15 inserted through the frame 8.

A synthetic resin cover 16 is attached to the frame 8 to cover it.

In FIGS. 1, 2, and 5, a guide pulley 17 is provided at the lower part of the sheath-like part of the frame 8, and a mounting collar 13 is provided at the rear part.
A drive boo IJ 1 B is pivotally supported on each, and a wire 7 connected to the support plate 6 is connected to a guide pulley 1.
The lower terminal 7b is connected to the drive booley 18 via the wire 7, and is wound around the drive booley IJ18 several times.

The drive pulley 18 is integrally equipped with a pulley shaft 18a, and this pulley shaft 18a has a shaft hole 19 drilled in the rear mounting collar 13 and a boss 20a of a cup-shaped spring case 20 attached to the mounting collar 13. Both ends are rotatably supported by.

The spring case 20 houses a spiral spring 21 that surrounds the pulley shaft 18a, and the inner end of the spring 21 surrounds the pulley shaft 18a.
a, and the outer end is locked to the spring case 20, respectively. The power of the mainspring spring 21 is stored so that the drive boob IJ18 can exert a force in the direction in which the wire 7 is wound up, that is, in the direction in which the support rod 2 is lowered. Thus, the drive pulley 18, the mainspring spring 21, and the spring case 20 constitute a power storage device [22].

In FIGS. 2 to 4, a one-way movement blocking device 23 is provided between the support plate 6 and the frame body 8a, which allows the support plate 6 to descend but prevents it from rising. This device 23 includes a swing claw 24 pivotally supported on the support plate 6, a large number of locking teeth 25, 25, etc. formed in tandem on the frame body 8a, and engagement between these locking teeth. The spring 26 urges the swing claw 24 in the direction shown in FIG.

As clearly shown in FIG. 2A, the swinging claw 24 consists of a wide claw portion 24a extending substantially vertically, and a protrusion 24b bent from the lower end of the claw portion 24a and extending substantially horizontally. The lower end of the claw portion 24a is swingably supported by the step portion 27 of the support plate 6, and the protrusion 24b extends until it passes through the through hole 28 of the support plate 6 and further through the guide groove 10.

In this way, the swinging pawl 24 can be moved to the support plate 6 without using a pivot.
is supported by

The spring 26 is attached to the bottomed hole 2 formed in the cable terminal 5.
9 and urges the claw portion 24a in the direction of engagement with the locking teeth 25, 25, . . . By artificially pushing down and lifting the protrusion 24b protruding outside the guide groove 10, the claw portion 24a is moved against the locking teeth 25, 25 against the force of the spring 26.
It is possible to separate from...

The cover 16 is provided with a working window 30 at a portion corresponding to the guide groove 10, and the protrusion 24 is inserted through this working window 30.
0 work window 30 where the above operation of b is performed
is normally closed by 131.

The locking teeth 25, 25, . . . are formed by partially cutting and raising the side wall of the frame 8 into a sawtooth shape with the tooth tips facing downward. Therefore, when the claw portion 24a of the swinging claw 24 comes into contact with the tooth tip of each locking tooth 25, the support plate 6 is prevented from rising, and the swinging claw 24 slides on the slope of each locking tooth 25 to support the support plate 6. Lowering of the plate 6 is allowed.

In FIG. 6, between the support plate 6 and the frame 8,
During normal times, the support plate 6 is locked at the upper limit, but a locking device 32 is provided to release the lock in an emergency such as sudden braking or a collision. This device 32 includes a rotary latch 3
3. It is composed of a lock lever 34, a lock spring 35, a release lever 36, a weight 37, and a return spring 38.

The rotating latch 33 has an upper short arm 40 and a lower long arm 41.
The frame 80 is formed into a bell crank shape, and is swingably supported on the outer surface of the side plate 8b of the frame 80 by a pivot 39. Further, the short arm 40 is formed into a bifurcated shape with a long upper arm 40a and a short lower arm 40b.

The engagement pin 9 is detachably held by the lower arms 40a and 40b. The non-operating position B of the rotary latch 33 that releases the retaining pin 9 is regulated by a stopper 42 formed on the frame 8.

On the other hand, the long arm 41 is provided with a pair of upper and lower locking projections 43, 44 projecting forward at its lower end, and its lower end surface is a cam surface 41a.

The lock lever 34 is attached to a pivot shaft 45 below the rotary latch 33.
A pair of lever plates 46. are pivotably supported on the outer surface of the side plate 8b and are opposed to each other with the long arm 41 in between.
46, a pin 47 that integrally connects both lever plates 46.46 to each other, and a roller 48 with a pole bearing fitted on this pin 47 between both lever plates 46.46.
It consists of Lock lever 34 with such a configuration
has high rigidity, and the support rigidity of the pin 47 supported at two points is also high, so even if a large external force is applied, this pin 47
The roller 48 supported by the roller 48 can always maintain an appropriate posture.

The roller 48 is adapted to be releasably engaged between the engagement protrusions 43 and 44 of the rotary latch 33.

The engagement surface 44a of the lower engagement protrusion 44 is formed into a circular arc surface centered on the pivot shaft 45 when the rotary latch 33 is at the predetermined operating position fiA. In the illustrated example, the pivot shaft 45 of the lock lever 34 extends from the engagement surface 44a.
The rotary latch 33 is disposed away from the rotation direction to the non-operating position B on the opposite side.

Furthermore, in order to ensure proper engagement between the roller 48 and the rotary latch 33, it is advantageous to attach flanges 48a that sandwich the rotary latch 33 to both ends of the roller 48, as shown in FIG.

As shown in FIGS. 7 and 9, the pin 47 protrudes long from one lever plate 46 and projects into a notch 50 provided in the side plate 8b of the frame 80.

The notch 50 controls the locked position C and the unlocked position of the lock lever 34 by receiving the pin 47 with its upper and lower end walls.
In the locking position C, the roller 48 engages between the locking protrusions 43 and 44 to hold the rotary latch 33 in the operating position A, and when the locking lever 34 is in the unlocked position, the roller 48 is adapted to separate from both engaging protrusions 43 and 44.

This lock lever 34 is normally biased and held at the lock position C by a lock spring 35.

The release lever 36 is swingably supported by a bracket 51 protruding from the front surface of the frame 8 about a pivot 52 . The lever 36 is formed into a bell crank shape by a horizontal arm 36a facing the side surface of the portion of the pin 47 that protrudes outside the lever plate 46, and a vertical arm 36b extending downward from the base end of the arm 36a. and its vertical arm 36b
A cylindrical weight 37 is pivotally supported at the lower end of.

The bracket 51 is provided with a pair of stoppers 53 and 54 that receive the weight 37 and regulate the holding position E and release position F of the release lever 36.
6, in the holding position E, the horizontal arm 36a faces the circumferential surface of the pin 47 with a constant gap l (see FIG. 6A), and in the release position F, the horizontal arm 36a holds the lock lever via the pin 47. 34 to the unlocked position.

The release lever 36 is normally biased and held at the holding position F by a return spring 38.

In FIG. 1, reference numeral 55 is a stopper formed on the frame 8 to regulate the lower limit of the support plate 6.

Next, the operation of this embodiment will be explained mainly with reference to FIGS. 1, 10, and 11.

FIG. 1 shows the normal state in which the support rod 2 of the buckle 1 is pulled up to its upper limit. In this state, the release lever 3
6 is held in the holding position by a return spring 38. Also, the lock lever 34 is moved to the locked position C by the lock spring 35.
Accordingly, the roller 48 of the lock lever 34
is engaged between the engagement protrusions 43 and 44 of the rotating latch 33 to hold the rotating latch 33 in the operating position A. The rotation latch 33 holds the retaining pin 9 between the upper and lower arms 40a and 40b of the short arm 40, and locks the support rod 2 at its upper limit.

Therefore, the wire 7 connected to the support plate 6 has
A tension state is provided by the driving force of the drive pulley 18 by the mainspring spring 21.

In this case, in FIG. 1, a clockwise moment acts on the rotating latch 33 from the engagement pin 9 to the short arm 40 due to the force of the mainspring spring 21, but this moment causes the engagement of the long arm 41. The pressing force applied from the surface 44a to the roller 48 of the lock lever 34 is applied to the lock lever 34 because the engaging surface 44a is an arcuate surface centered on the pivot 45 as described above. acts as a simple tensile force whose line of action is a straight line passing through the center of the axis, and the force is received by the pivot shaft 45. Therefore, the set load of the lock spring 35 can be set to a relatively small value that simply holds the lock lever 34 in the lock position C without being affected by disturbances such as vibrations.

Further, by adjusting the lever ratio between the short arm 40 and the long arm 41 of the rotary latch 33, the tensile force acting on the lock lever 34 from the rotary latch 33 can be suppressed to a minimum, thereby reducing the load on the pivot shaft 45.

In this state, even if the occupant inserts and connects the seatbelt connecting fitting pulled out from the retractor into the buckle 1 in order to put on the seatbelt, the support rod 2 remains at the upper limit position.

While driving the vehicle, if the vehicle decelerates above a certain value due to sudden braking or a collision, the weight 37 senses this and returns the release lever 36 to the release position F against the force of the spring 38. Rotate it toward the camera.

The horizontal arm 36a of the release lever 36 and the lock lever
Since a gap 1 is initially provided between the release lever 34 and the bottle 47, the rotation of the release lever 360 is accelerated without any resistance from the lock lever 34 while the gap 2 is being closed. Therefore, when the horizontal arm 36a hits the pin 47, it exerts a relatively large impact force, and this hammer action causes the lock lever 34 to move to the unlocked position against the frictional resistance existing around its pivot 45 and the force of the lock spring 35. Then, the roller 48 smoothly rolls out from the engagement surface 44a of the lower engagement protrusion 44.

Then, when the roller 48 comes off the engagement surface 44a,
Since the lock lever 34 no longer has a locking function with respect to the rotary latch 33, a strong moment acting on the rotary latch 33 from the mainspring spring 21 via the wire 7 causes the rotary latch 33 to move away from the lock lever 33 as shown in FIG.
While pushing the lever to the unlocked position, it rapidly rotates toward the non-operating position B.

By the way, since the rotation of the lock lever 34 to the non-locking position by the rotation latch 33 causes the roller 38 to be separated from the release lever 36, the rotation latch 33 absorbs the repulsive force of the return spring 38 of the release lever 36 and the weight. Weight 37
It is possible to quickly rotate to the non-operating position B without any resistance due to the inertial force or the like.

From this, the rotation angle between the holding position E and the release position WF of the release lever 36 is such that the release lever 36 rotates the lock lever 34 to the point where the roller 48 is about to disengage from the engagement surface 44a. It will be appreciated that it may be set to a minimum angle.

When the rotary lash 33 rotates to the non-operating position B, the energy of the mainspring spring 21 is released all at once, and the drive pulley 18 rapidly winds up the wire 7 to draw the support rod 2 into the frame 8, and the buckle 1 is quickly pulled out. lower to. At the same time, the engagement pin 9 moves the rotary latch 33 to the inoperative position B.
It separates from the short arm 40 while rotating it.

In this case, the wire 7 has the rotary latch 33 at the operating position HA.
Since the buckle 1 is in a tensioned state from the time when the buckle 1 is in a tensioned state, there is no time delay in transmitting the driving force of the drive boob IJ18 to the support rod 2, and the buckle 1 can be lowered quickly.

On the other hand, the retractor (not shown) is locked by a known action to prevent the seat belt from being pulled out, so that the lowering of the buckle l applies tension to the seat belt.

In this way, slack in the seat belt due to stretching of the seat belt itself or tightening by the tractor is immediately removed, and the restraining force of the seat belt is accurately exerted on the occupant.

When the support plate 6 is lowered, in the one-way movement prevention device W23, the swing claw 24 slides on the slope of each locking tooth 25 and lowers together with the support plate 6, but then the forward movement load of the occupant is applied to the seat belt. When the buckle 1 is about to be pulled up, the swinging pawl 24 engages with the tips of the opposing locking teeth 25, restraining the buckle 1 from being pulled up, and maintains the tensioned state of the seatbelt. be able to.

When there is no deceleration from the vehicle, as shown in Figure 11,
The release lever 36 is returned to the holding position by the force of the return spring 38, and the lock lever 34 is accordingly returned to the lock position C by the force of the lock spring 35 while leaving the rotary latch 33 in the non-operating position B.

To pull up the buckle 1 to its upper limit again, remove the lid 31 and use a suitable tool such as a screwdriver to push the protrusion 24b of the swinging claw 24 through the working window 30 of the cover 16.
4a is released from the locking teeth 25, 25, . . . and in this state, the buckle l is pulled up. During this time, the wire 7 is pulled up by the support plate 6, so the wire 7 is pulled out from the drive pulley 18, causing the pulley 18 to rotate and causing the spiral spring 21 to store force again. On the other hand, the retaining pin 9 that rises together with the support plate 6 is attached to the rotating latch 3.
Push up the lower arm 40a of the short arm 40 of No. 3 to release the rotation latch 33.
is engaged between the upper and lower arms 40a and 40b of the short arm 40 while being rotated counterclockwise in FIG. 11, and the rotary latch 33 reaches its initial operating position A. During this time, the cam surface 41a at the tip of the long arm 41 once pushes down the roller 48 of the lock lever 34 against the force of the lock spring 35, and when the cam surface 41a passes the roller 48, the force of the lock spring 35 causes the cam surface 41a to push down the roller 48 of the lock lever 34. 48 engages between the engagement protrusions 43 and 44 of the long arm 41 to hold the rotary latch 33 in the initial operating position A.

In the present invention, the pivot shaft 45 of the lock lever 34 is moved from the roller 48 to the rotary latch 33, contrary to the above embodiment.
may be arranged apart in the direction of rotation to the non-operating position B,
In this case as well, the engagement surface 44a of the rotary latch 33 is connected to the pivot shaft 4.
It is formed into an arcuate surface centered at 5. In this way, the lock lever 34 can receive the moment acting on the rotating latch 33 from the mainspring spring 21 as a simple compressive force during normal times.

C1 Effects of the Invention As described above, according to the first feature of the present invention, when the release lever rotates the lock lever to the point where the lock lever disengages from the rotating latch, the stored force is released. Due to the strong moment acting on the rotary latch from the device, the rotary latch rotates to the non-operating position while pushing away only the lock lever, so the rotary latch is affected by the repulsive force of the release lever's return spring, the inertial force of the weight, etc. The rotational latch's emergency responsiveness can be improved without adding any resistance. Moreover, since the cable connected to the support member is always kept under tension by the force of the force storage device, when the rotation latch is released, there is no delay in the transmission of force from the force storage device to the support member due to slack in the cable. The seatbelt connected to the buckle can be quickly tightened, contributing to improved restraint for the occupant.

According to the second feature of the present invention, in an emergency, the lock lever is reliably rotated toward the non-operating position without being affected by the frictional resistance of various parts by the hammer action of the release lever on the lock lever. This can contribute to improving reliability.

Furthermore, according to the third feature of the present invention, in normal times, the lock lever receives the moment applied to the rotating latch from the force storage device as a simple tensile force or compressive force, so that the lock lever has a relatively small set load. It becomes possible to hold the lock lever in the locked position, and the lock lever
This can contribute to improving emergency responsiveness.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a partially cutaway side view of an automobile seat belt tensioning device, and FIG.
The figure is a sectional view taken along the line -■-■ in Figure 1, Figure 2A is an exploded perspective view of the main part of Figure 2, and Figure 3 is an enlarged sectional view taken along the line ■-■ in Figure 2. Figure 5 shows the IV-IV line and ■-V line in Figure 1.
6 is an enlarged view of the main part of FIG. 1, FIG. 6A is a side view showing the relationship between the lock lever and release lever, and FIG. 7 is a partial side view of the frame in FIG. 8
9 and 9 are cross-sectional views taken along the lines ■-■ and IX-IX in FIG. 6, FIGS. 10 and 11 are action explanatory views, and FIG. It is a sectional view similar to the figure. A, B...Rotary latch operation, non-operation position, C2D
...Locked and unlocked positions of locking members, E, F
... Holding and releasing the release lever 1... Buckle, 2... Supporting rod as a supporting member, 7... Wire as a rope, 8... Frame, 9... Engaging pin ,
17... Guide pulley, 18... Drive pulley,
21... Mainspring spring, 22... Force storage device, 23.
...One-way movement prevention device, 24... Rocking claw, 25...
- Locking tooth, 32... Lock device, 33... Rotating latch, 34... Lock lever - 135... Lock spring,
36... Release lever-137... Weight, 38...
・Return spring, 39... Pivot of rotating latch, 44...
Engagement protrusion, 44a... Arc surface, 45... Lock lever pivot, 47... Pin, 48... Roller, 52...
... Release lever axis patent applicant Honda Lock Co., Ltd.

Claims (1)

[Claims] [1] A frame (8) capable of moving the support member (2) of the buckle (1) to which the seat belt is connected from a normal protruding position to a retracted position that applies tension to the seat belt.
The frame (8) is provided with a force storage device (22) that guides the supporting member (2) toward the retracted position via the cable (7), and further includes: A locking device (32) that normally locks the power storage device (22) at the protruding position of the support member (2), but releases the lock in an emergency, and a locking device (32) that moves the support member (2) to the retracted position. A seat belt tensioning device is provided with a unidirectional movement prevention device (23) that allows movement in the opposite direction but prevents movement in the opposite direction. A rotating latch (
33); Pivotally supported by the frame (8), the rotating latch (
33) in its operating position (A).
C) and a locking lever (34) that can be rotated between a lock lever (34) and an unlocked position (D) in which it disengages from the rotary latch (33); a lock lever (35) which is pivotably supported on the frame (8) and which occupies the lock position (C);
The holding position (E) opposite to the lock lever (3)
4) to its unlocked position (D), and allows the lock lever (34) to rotate independently to its unlocked position (D). A release lever (36); a return spring (38) capable of biasing and holding the release lever (36) in its holding position (E);
and a weight (37) for moving the release lever (36) to its release position (F) in response to an emergency situation, and a locking device (32). [2] In the item described in paragraph 1, the release lever (36) is located between the lock lever (34) occupying the lock position (C) and the release lever (36) occupying the holding position (E). A seat belt tensioning device characterized in that a gap (1) is provided that is clogged during movement toward (F). [3] In the item described in paragraph 1, the lock lever (34) has a mechanism that engages with the engagement surface (44a) of the rotary latch (33) to hold the rotary latch (33) in its operating position (A). In addition to providing a roller (48) to
The engagement surface (44a) is connected to the pivot shaft (34) of the lock lever (34).
45) A seatbelt tensioning device, characterized in that it is formed into an arcuate surface centered on.