JPS5919705B2 - Retractor equipped with a mechanism to deactivate the emergency lock mechanism when unnecessary - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle safety belt device equipped with an emergency locking mechanism or a tractor that disables the emergency locking mechanism when locking is not required.

In safety belt systems for vehicles, vehicles, etc., the webbing can be freely pulled out and pulled back from the tractor during normal operation, and when the speed of the vehicle suddenly changes due to a collision, etc., the webbing is locked and the webbing is locked. Many methods have already been proposed and are actually in use.

In such an emergency locking mechanism, a webbing pull-out acceleration sensing type that senses a change in the webbing pull-out speed is used as a means for sensing a sudden change in the speed of the vehicle due to a collision, etc., and a vehicle acceleration sensor that directly senses changes in the speed of the vehicle. Two types of sensing types are conventionally used.

In the case of the former, that is, a tractor equipped with an emergency locking mechanism that senses the acceleration of webbing being pulled out, the emergency locking mechanism is activated even when the webbing is rapidly pulled out during installation, making it difficult to operate. A mechanism has already been proposed that activates an electromagnet or the like to deactivate the emergency locking mechanism when the emergency locking mechanism is not activated.

However, in the case of the latter, ie, a tractor equipped with an emergency locking mechanism that senses vehicle acceleration, disabling the emergency locking mechanism is not so much of a problem.

This is because the retractor has conventionally been attached to a vehicle body or the like.

However, in the case of a passive safety belt system, it is necessary to attach a retractor to a movable part such as a door of the vehicle. There is a risk that the emergency locking mechanism will activate during movement of the part.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an emergency locking mechanism deactivation device that can manually or automatically deactivate a vehicle acceleration sensing type emergency locking mechanism when desired. do.

A preferred embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, side plates 2 and 3 parallel to each other are integrally formed on a base 1 of a retractor for a safety belt device, and a winding shaft 4 is rotatably supported approximately at the center of the side plates 2 and 3. has been done.

The take-up shaft 4 is provided with a take-up spring (not shown) at the right end in FIG. 1, which urges the take-up shaft 4 in the webbing winding direction.

Reference numeral 5 designates a spring cover that houses the coiled spring and is fixed to the base side plate 3.

Between the base side plates 2 and 3, a webbing take-up spool 6 and flanges 7.degree. 8 at both ends of the webbing take-up spool 6 are integrally attached to the take-up shaft 4, forming a take-up reel serving as a take-up means.

A ratchet gear, which is a main gear, is formed on the periphery of the flange 7.8, and when a lock member 10, which is a main lock member (described later), is engaged, it prevents the take-up reel from rotating in the webbing pull-out direction. ) is designed to prevent withdrawals.

On the winding shaft 4, an auxiliary ratchet gear 11, which is an auxiliary gear having a smaller diameter than the flange 7, is arranged adjacent to the flange 7.

The number of teeth on the ratchet gear of the flange 7.8 and the number of teeth on the auxiliary ratchet gear are selected to be identical.

A cylindrical spacer 12 is loosely fitted on the winding shaft 4 between the base side plate 7 and the auxiliary ratchet gear 11.

A support protrusion 2a is integrally formed inside the lower edge of the base side plate 2, and a case 14 of a vehicle body acceleration sensing means 13 is fixed thereto.

The case 14 has a chamber 15, which has a flat bottom surface 15a.
An inertial sensing member 16 is placed thereon.

The inertial sensing member 16 normally stands upright as shown in FIG. 1, but when it receives a force due to a change in the predetermined speed of the vehicle body, it falls down as shown in FIG. This is a well-known fact.

In this embodiment, the inertial sensing member is of an upright type, but it goes without saying that it may be of other types, such as a pendulum or a ball.

A shallow recess 16a is formed at the top of the inertial sensing member 16, in which a downward protrusion 18a of a lever 18 pivotally supported at the upper center of the case is placed.

The lever 18 rotates in the clockwise direction in FIG.
It has a tip portion 18b extending downwardly.

The lever 18 is formed to have a portion 18c extending in the opposite direction from its pivot point, that is, toward the side of the base side plate 3, so that it reacts more sensitively to the inclination of the inertial sensing member 16.

The inertial sensing member 16, the case 14, the lever 18, and the like constitute an inertial sensing means.

Slightly above the lever 18, the rod member 20 is connected to the side plates 2 and 3.
The bridge is movable in the axial direction.

゛A ratchet lever 21, which is an auxiliary locking member, is normally fitted below the auxiliary ratchet gear 11 into this rod member 20, so that it can rotate freely with respect to the rod member 20, but cannot be slid in the axial direction by a retaining ring 22. A weak compression coil spring 23 surrounding the rod member 20 is interposed between the ratchet lever 21 and the base side plate 2.

The part of the rod member 20 that protrudes outward from the side plate 2 is the large diameter part 2.
0a (FIG. 5), and the inner end surface of the large diameter portion collides with each other due to the bias of the coil spring 23, and the ratchet lever 21 is normally positioned just below the auxiliary ratchet gear 110.

The left end portion of the large diameter portion 20a is formed as an enlarged portion 20b.

As shown in FIG. 3 or 4, the lower edge of the ratchet lever 21 in its free state due to its own weight is placed on the extended end portion 18b of the lever 18 as shown in FIG. When the rod member 20 rotates and the portion 18b rises, the rod member 20
It rotates counterclockwise around 0 as shown in Figure 4.

A ratchet tooth 21a is formed on the upper portion of the lever 21 so that the ratchet tooth 21a can mesh with the auxiliary ratchet gear 11 when the lever 21 is rotated in the counterclockwise direction.

A hole 21b that opens in the axial direction is bored in the approximate center of the ratchet lever 21, and this hole is connected to a fan-shaped hole (only one of which is shown with reference numeral 2a in FIG. 2) that is formed opposite to the base side plates 2 and 3. ) is inserted through the locking member 10 with a suitable clearance.

The locking member 10 usually has its own weight and/or the base side plate 2
The spring 26 (FIG. 3) disposed between the take-up reel flange 7.8 is in a non-meshing position with the outer ratchet gear of the flange 7. As described above, the rotation of the take-up reel in the webbing drawing direction is stopped to prevent the webbing from being drawn out.

With the above structure, when the inertia sensing member 16 is tilted by sensing a sudden change in speed such as a vehicle collision or sudden braking, the lever 18 rotates around the pivot point and the lever 18 rotates around the pivot point 18b.
rotates the ratchet lever 21 around the rod member 20, which is a support member, so that the ratchet teeth 21a are connected to the auxiliary ratchet 1.
1 and reaches the engaged position.

On the other hand, at this time, the person wearing the safety belt leans forward due to this rapid speed change, so the webbing is pulled out and the take-up shaft and take-up reel are rotated in the webbing pull-out direction.

The auxiliary ratchet gear 11 fixedly attached to the winding shaft engages with the ratchet teeth 21a of the ratchet lever 21 to further rotate the ratchet lever 21, so that the locking member 1 passes through the hole 2ib of the ratchet lever 21.
0 also rotates, and the locking member locks onto the take-up reel flange 7.
The webbing is engaged with the ratchet gear 8 to lock the rotation of the take-up reel and the take-up shaft integrated therewith, thereby preventing the webbing from being pulled out and restraining the wearer (see FIGS. 7 and 8).

On the other hand, on the outer surface of the base side plate 2, an external operation member 30 (only it is taken out and shown as a perspective view in FIG. 6), which is an external operation means, rotates around a shaft support member 310 fixed to the side plate 2. movably supported.

The external operating member 30 includes an operating lever portion 30a that is operated manually or in conjunction with other appropriate means as described below, and a portion that branches at a certain angle with respect to the operating lever portion 30a. It has a branch lever part 30b.

The branch lever part 30b has a certain angular width and the shaft support member 31
It has an almost fan shape with the center at the center, and an arcuate slot 30c centered at the pivot point is formed near the outer periphery.
The arcuate slot 30c is attached to the large diameter portion 2 of the rod member 200 described above.
0a passes through.

The width of the arcuate slot 30c is selected to be sufficiently thicker than the diameter of the large diameter portion 20a, but smaller than the diameter of the enlarged portion 20b at the tip of the large diameter portion.

The edges of the arcuate slot 30C include a low cam flat portion 30d near one end of the slot, a high cam flat portion 30e near the other end, and a lower cam flat portion 30d at the center of the length of the slot. The external operating member 30 is formed as a cam portion having a slope portion 30f that continues from the top to a high cam flat portion 30e, and the external operating member 30 is connected to the shaft supporting member 3.
When rotated around 10, the enlarged portion 20b of the rod member 20
Since the rod member 20 is in contact with these surfaces, the rod member 20 becomes a follower and slides in the axial direction.

When the enlarged portion 20b of the rod member 20 is in contact with the lower cam plane portion 30d of the branch lever portion 30b of the external operating member 30, the rod member 20 is in the rightmost position shown in FIG. At this time, the ratchet lever provided on the rod member 20 and the auxiliary ratchet gear 11 are aligned in a direction perpendicular to the axis.

That is, in this state, emergency locking according to the above-described aspect is possible.

When the operating lever portion 30a of the external operating member 30 is rotated counterclockwise by applying an external force to the state shown in FIG. 9, the rod member 20 resists the bias of the compression spring 23 as shown in FIG. It moves to the left, so that the ratchet lever 21 also moves to a position axially offset from the auxiliary ratchet gear 11.

Therefore, the ratchet lever 21 and the auxiliary ratchet gear 11 cannot mesh with each other.

That is, the emergency locking mechanism becomes inactive.

In this embodiment, a swing lever 35 is further swingably attached to the inside of the base 1 by a pivot pin 36, substantially parallel to the rod member 20.

A swing lever 35 serving as a restraint means passes through a slot 37 (see FIG. 2) formed in the base side plate 2 in the vertical direction.

The swinging lever 35 has an extension 35a projecting outward from the slot 37 from its widthwise central portion, and the extension has a low cam plane of a portion of the sector-shaped branch lever of the external operating lever 30. The portion 30d1 can engage with first and second protrusions 38 and 39 formed to protrude in the radial direction from the outer circumferential portion in correspondence with the high cam plane portion 30e.

When the external operating member 30 is in the counterclockwise rotating position as shown in FIG. or fifth
On the other hand, when the external operating member 30 is rotated clockwise from the state shown in FIG. 2 by an external force, it is held at the lower rotational position until the second protrusion 39 engages with the extension 35a. (See FIGS. 9 and 10), the second protrusion 39 is connected to the extension part 3.
When engaged with 5a, it rotates upward (see Figures 11 to 13).

A leaf spring 40 is attached to the base 3, and the leaf spring 40
The swing lever 35 is urged toward the surface of the base 1 so that the swing lever 35 cannot swing due to external force.

Therefore, the external operating member 30 is rotated clockwise to move the swing lever 35 as shown in FIG.

Even if the external operating lever 30 is rotated counterclockwise again after being moved to the upper rotational position shown in FIG.
Until it comes into contact with the extension part 35a, the plate spring 40 holds it at the upper rotational position and does not rotate under its own weight.

On the other hand, a protrusion 21C (see FIG. 4) is provided at the upper portion of the ratchet lever 21 on the base 1 side, and this protrusion 21c protrudes into the rotation locus of the swing lever 35.

When the swing lever 35 is in the lower rotation position as shown in FIGS. 4 and 5, the protrusion 21c is not engaged with the swing lever 35, and the ratchet lever 21 is moved from the swing lever 35.
is completely free.

However, when the swing lever reaches the upper rotation position as shown in FIGS. 12 and 13, the swing lever 35 engages with the protrusion 21c of the ratchet lever 21 and moves the ratchet lever clockwise around the rod member 200. Rotate ratchet tooth 21b
into a non-meshing position with the auxiliary ratchet gear 11 and hold it there.

In this position, ratchet lever 21 holds inertial sensing member 16 in an upright position via lever 18, as shown in FIG.

Therefore, assuming that the metal rod member 20 does not move in the axial direction as described above, the swing lever 35 is rotated up and down by the rotation of the external operating member 30, and the ratchet lever is moved in the same plane as described above. The emergency locking mechanism can be deactivated by rotating it inward.

In this embodiment, the ratchet lever is moved to the non-operating position by rotation, but this may be done by shifting the entire ratchet lever to the non-operating position and restraining it.

In the above explanation, the movement of the ratchet lever 21 to the non-operating position is divided into two parts, one by the rod member 20 and the other by the swing lever 35. The effect of the example will be explained.

First, from FIG. 1 to FIG. 5, the emergency lock is possible, and the emergency lock operation is as described above.

From this state, when the external operating member 30 is rotated clockwise in conjunction with the opening and closing of the door or by other external force such as manual operation, the enlarged portion 20b of the rod member 20 first becomes a branch of the external operating member 30. The cam slope part 30f formed on the lever part 30b rides on the high cam flat part 30e and moves to the left as shown in FIG. The ratchet lever 21, which had been in this position, also moves axially to the left and reaches a non-meshing position with the auxiliary ratchet gear, that is, a second axial position.

On the other hand, since the second protrusion 39 of the external operating member 30b is provided at a position corresponding to the height/cam plane part 30e, when the rod member 20 moves to almost the maximum limit, the second protrusion 39 moves to the swing lever. 35 (see FIG. 9), and then the second protrusion 39 causes the swinging lever 35 to rotate upward clockwise around the pivot pin 36, and the first
reach the position.

By this rotation, the swing lever supports the rear protrusion 21c of the ratchet lever 21 from below (see FIG. 12).

The ratchet lever 21 is therefore an extension 1 of the lever 18.
8b to hold the inertial sensing member 16 in an upright position.

This position of the ratchet lever 21 is a position in which it does not mesh with the auxiliary ratchet gear 11, even if it is on the same plane as the auxiliary ratchet gear 11, as described above.

This state is the state in which the emergency locking mechanism is not activated.
1 to 13 correspond to this.

Next, in order to release this non-operating state, the external operating member 30 in the state shown in FIG. 230 action returns to the starting position.

That is, since the first protrusion 38 of the ram branch part 30b, which returns the ratchet lever 21 to the same plane as the auxiliary ratchet gear 11, is formed to correspond to the low cam flat part 30d, the swing lever is 35 is ratchet lever 2
1] remains the same.

When the rod portion 20 completes its return, the first protrusion 38 of the branch lever portion 30b rotates the swinging lever 35 downward to reach an intermediate position where the swinging lever 35 releases the restraint on the ratchet lever 21. (FIGS. 14 and 15 show a state in which the above-described emergency locking mechanism is in the process of being deactivated).

In this way, the retractor becomes ready for emergency locking again.

Now, when a sudden speed change occurs in the vehicle and the inertia sensing member 16 is tilted, the lever 18 rotates around its pivot point as described above, and the extended tip 18b moves the ratchet lever 21 to rotate the rod member 20. Therefore, the ratchet teeth 21a can mesh with the auxiliary ratchet gear 11 on the take-up reel side.

At this time, the seat belt wearer leans forward due to the speed change of the vehicle and pulls out the webbing, so the winding means and auxiliary ratchet gear 11 rotate rapidly and mesh with the ratchet teeth 21a of the ratchet lever, causing the ratchet lever 2
1 is further rotated around the rod member 20 to reach the second position.

Therefore, the locking member 10 is connected to the main ratchet gears 7, 8.
The winding means is interlocked with each other to prevent rotation of the winding means.

This is the emergency lock state (see FIGS. 7 and 8).

If the release of the restraint by the swing lever 35 is performed after the ratchet lever 21 returns to the same plane as the auxiliary ratchet gear 11 in this way, the inertia sensing member is restrained in an upright state upon return, and malfunction can occur. There is also an advantage that the ratchet lever 21 does not collide with the auxiliary ratchet gear during return.

Next, an example in which the retractor is incorporated into the door of a vehicle and the emergency locking mechanism is controlled in conjunction with the opening and closing of the door and the operation of the doorknob will be described with reference to FIGS. 16 and 17.

FIG. 16 shows the door closed, and FIG. 17 shows the door open. In these figures, reference numeral 50
1 is a schematic diagram of a door, and the tractor 51 described above is fixed at an appropriate position on the door 50.

The external operating member 30, which is rotatably attached to the pace side plate 2 of the retractor by a shaft support member 31, is integrally formed with the external operating lever 30a and a second branch lever part 53 that projects on the opposite side. A tension coil spring 54 is interposed between the second branch lever portion 53 and the retractor base side plate 2, and urges the external operating member 30 in the counterclockwise direction.

The door 50 also has an external operating lever 30 of the external operating member 30.
a first cam member 5 for engaging a and controlling rotation thereof;
Reference numeral 5 indicates a mounting rotatable about a fulcrum 56.

The first cam member 55 is a rotation control member 57, 5 fixed to the door.
8, and when the first cam member 55 is in the first rotation position on the rotation limiting member 57 side, the external operation member 30
is in a lower rotational position that allows emergency loading due to the tensile force of the tension coil spring 54 (FIG. 16).

The first cam member 55 is limited by the rotation limiting member 58.
When it reaches the rotational position (FIG. 17), the external operating member 30 follows it and reaches the upper rotational position against the bias of the tension coil spring 54, deactivating the emergency locking mechanism as described above. do.

A second cam member 60 is pivotally supported below the door 50 with a fulcrum 61 as the center of rotation.

A tension coil spring 63 is interposed between the tip of the second cam member 60 and the tip of the first cam member 55.

When the door 50 is closed, the second cam member 60 collides with a striker 65 provided on the vehicle body side, rotates clockwise, and moves the first cam member 55 to its first rotation position. However, when the door is open, it is in the upper rotational position shown in FIG. 17 by the tension coil spring 63.

On the other hand, a control rod 72 is attached to a door opening/closing knob 71 which is rotatably mounted in a well-known manner around a fulcrum 70.
is supported.

The control rod 72 extends to the vicinity of the extension 55a of the first cam member 55, and when the door knob 71 is pulled counterclockwise from the normal clockwise rotation position shown in FIG. 16 to open the door ( (dotted line in Figure 1T), the control rod 72 is attached to the extension portion 55a.
is pushed, and the first cam member 55 is rotated counterclockwise against the bias of the coil spring 63 to bring it to the second rotation position (upper rotation position) shown in FIG.

Therefore, the external operating member 30 engaged with the first cam member 55 also rotates clockwise as shown in FIG. 17 and reaches the second rotation position, thereby deactivating the emergency locking mechanism of the retractor 51.

When the doorknob 71 is released, the doorknob T1 and the control rod γ2 are returned to their original positions by a biasing member (not shown).

At this time, when the door is in a completely closed state or a so-called half-closed state, the striker 65 on the vehicle body side moves the second cam member 60 to the clockwise rotation position shown in FIG. Since the first cam member 55 is also returned to the tenth rotation position by the spring 63, the external operating member 30 is rotated counterclockwise in the manner described above, and emergency locking becomes possible.

In the door open state, the striker 65 leaves the second cam member 60, so the doorknob 71 is released and the doorknob 7
Even if the first cam member 55 and the control rod 72 are returned to their original positions, the first cam member 55 will not be able to maintain the spring 7 provided between it and the door body.
It is held at the 20th rotation position by the urging force of 5.

Note that this spring 75 is provided so as to allow the first cam member 55 to take two stable positions.
When the cam member is in the first rotational position, the cam member acts to hold the cam member in the first rotational position.

Although the illustrated doorknob is for external operation provided on the outside of the door, the door can be opened from the inside (the same applies to doorknobs for internal operation).

According to the present invention described above, the emergency locking mechanism is released when unnecessary.

Therefore, it is advantageous to attach the retractor to a movable part such as a door.

Further, according to the embodiment of the present invention, when the emergency locking mechanism is released from non-operation, the auxiliary locking member can be reliably moved to a position where it can be operated.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of an embodiment of the present invention, Fig. 2 is a left side view thereof, and Fig. 3 is a perspective view showing an emergency locking mechanism portion of the embodiment. Fig. 4 is an explanatory diagram of the main parts seen from the left side showing a state in which only a part of the embodiment can be taken out and emergency locking is possible;
The figures correspond to the state shown in Fig. 4, but are a partial front view with the inertial sensing means and external operating member removed, Fig. 6 is a perspective view of the external operating member, and Fig. 7 is a state showing the emergency lock state. 4
8 is a view similar to FIG. 5 also showing the emergency lock state, FIG. 9 is a partial left side view showing the external operating member during rotation, and FIG. 10 is a view similar to FIG. 9. FIG. 11 is a partial left side view showing the external operating member when the emergency locking mechanism is not activated; FIG. 12 is a diagram similar to FIG. 5 in a state corresponding to FIG. Figure similar to Figure 13
The figure is similar to Fig. 5 in a state corresponding to Fig. 11, Fig. 14 is the same as Fig. 4 immediately before the emergency locking mechanism is released from deactivation, and Fig. 15 is the same as Fig. 14. A view similar to FIG. 5 immediately before completion of deactivation of the corresponding emergency locking mechanism,
FIG. 16 is an explanatory diagram when the lid 2 controller according to the above embodiment is assembled into the door of a vehicle, and shows the door in a closed state, and FIG. 17 is a diagram similar to FIG. 16. It is a diagram showing a state where the door is open. Explanation of symbols of main parts, 4... Winding shaft, 6...
...Take-up spool, 28...Ratchet gear, 10...Lock member, 11...Auxiliary ratchet gear, 13...Vehicle body acceleration sensing means , 16... Inertial sensing member, 18...
Lever, 20... Bar member, 21... Ratchet lever, 23... Coil spring, 30...
...External operating member, 35...Swing lever.

Claims (1)

[Scope of Claims] 1. A winding means for winding webbing having a main gear and an auxiliary gear, an inertia sensing means for directly sensing and displacing a predetermined speed change of a vehicle by inertia, and usually the auxiliary gear. It is in the first position of non-meshing,
an auxiliary locking member capable of taking an intermediate position capable of meshing with the auxiliary gear in conjunction with the displacement of the inertial sensing means, and further meshing with the auxiliary gear and taking a second position by rotation of the auxiliary gear; Although it is in a non-meshing position with the main gear, it reaches a meshing position with the main gear in conjunction with the movement of the auxiliary lock member from the intermediate position to the second position, and meshes with the main gear to pull out the webbing. and a locking means having a main locking member for blocking, the auxiliary locking member being able to mesh with the auxiliary gear and locking the auxiliary gear at a first axial position on the plane in which the auxiliary gear exists; movable between a second axial position axially apart from the first axial position and incapable of meshing with the auxiliary gear, and when emergency locking is required, the auxiliary locking member is moved to the first axial position; An external operating means is provided which disables the emergency locking mechanism by moving it to a second axial position when locking is not required, and the external operating means includes a movable support member that supports the auxiliary locking member; and an external operating member having a cam portion that engages with the support member to move the auxiliary lock member. A tractor having a function of deactivating an emergency lock when unnecessary. 2. In claim 1, the support member is a rod member provided in the axial direction and movable in the axial direction, and the auxiliary lock member is attached to the rod member so that it can rotate but not move in the axial direction. The retractor is configured such that the cam portion of the external operating member can move the rod member in a rod direction. 3. The retractor according to claim 2, wherein the external operating member is rotatably supported on a side plate of the tractor.