JPH11165569A - Reclining seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To previously prevent mounting of a seat belt in a condition that generation of a submarine phenomenon is possible. SOLUTION: In a reclining seat incorporating in a seat back a retractor provided with a lock means locking rotation in a webbing draw out direction of a winding shaft, car body acceleration sensor detecting prescribed acceleration to actuate this lock means, and an adjustment means properly adjusting a direction of the car body acceleration sensor regardless of a tilt condition of the seat back, the seat is provided with an engaging member 88 provided in a seat part and an engaged member 87 provided in the seat back to be engaged with the engaging member 88 at a tilt angle in a proper use range of a seat belt to fix a tilt position of the seat back.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved reclining type seat having a seat belt retractor.

[0002]

2. Description of the Related Art Conventionally, a seat belt device for safely holding a vehicle occupant or the like in a seat includes an emergency lock that physically locks a retractor by inertial sensing means that responds to sudden acceleration, collision or deceleration. Emergency locking retractors with mechanisms to effectively and safely restrain occupants are used.

[0003] The retractor as described above is a seat back (seat back) of a reclining type seat of a vehicle or the like.
It is considered to be used by being mounted inside.
For example, U.S. Pat. No. 4,610,480 discloses a retractor having a vehicle body acceleration sensor mounted in a seat back and capable of operating properly even when the seat back is in a different tilt position. The retractor is rotatably attached to a pipe inside the seat back. Then, by operating the lever when the seat back is reclined, the fixation of the retractor is released, and the retractor is rotated by its own weight and kept in an appropriate direction regardless of the reclining angle.

[0004]

However, in the retractor described in the above-mentioned U.S. Pat. No. 4,610,480, when a head-on collision occurs in a state where a seat is reclined with a belt worn, what kind of reclining angle is required. However, since the retractor operates and the belt is locked, if the reclining angle is gentle, the occupant may move forward as if sliding between the belt and the seat, a so-called submarine phenomenon. When the submarine phenomenon occurs, a belt arranged to restrain the occupant's shoulder from near the shoulder may be caught on the occupant's neck. It is difficult for the occupant to determine the reclining angle at which the submarine phenomenon can occur, and the occupant tends to judge that the seat belt should be worn for safety at any reclining angle. Therefore, the occupant may wear the seat belt even at a reclining angle at which the submarine phenomenon may occur. Therefore, an object of the present invention is to provide a reclining type seat that prevents wearing of a seat belt in a state where a submarine phenomenon can occur.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to provide a lock means for locking the rotation of a winding shaft in a webbing withdrawing direction, a vehicle acceleration sensor for sensing a predetermined acceleration and operating the lock means. In a reclining seat incorporating a retractor having adjustment means for appropriately adjusting the direction of the vehicle body acceleration sensor regardless of the tilted state of the seat back, the engagement member provided in the seat portion of the reclining seat is provided. An engaged member that is provided in the seat back and engages with the engaging member at an inclination angle within a proper use range of the seat belt to fix the inclined position of the seat back. It is solved by the characteristic reclining seat.

According to the above structure of the present invention, a retractor in which the locking means operates reliably by reliably detecting the vehicle body acceleration by the vehicle body acceleration sensor whose orientation is adjusted regardless of the inclination of the seat back. Even within the proper use range of the seat belt, the engaging member and the engaged member are engaged within the proper use range of the seat belt, the inclined position of the seat back is fixed, and the submarine phenomenon can occur. The seat back is not fixed. Since the seat back is fixed in the proper use range of the seat belt, the occupant can sit down and wear the seat belt. Further, since the seat back is not fixed in an improper use range of the seat belt, when the seat back is seated and leans against the seat back, the seat back is lowered to a full flat state. Therefore, except for the full flat state of the seat back, the occupant cannot wear the seat belt and sit down in a position where the submarine phenomenon can occur, and the submarine phenomenon can be prevented beforehand.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a schematic side view of a reclining type seat to which a seat belt retractor according to an embodiment of the present invention is attached. As shown in FIG. 1, a seatbelt retractor 100 including a vehicle body acceleration sensor 51 is mounted in a seatback 62 of a reclining type seat 61 mounted on a vehicle body. The seat back 62 can pivot about an adjustment shaft 71 extending in the vehicle width direction.
The tilt angle is adjusted according to the occupant's physique and the like.

FIGS. 2 and 3 are exploded perspective views of the seat belt retractor 100. FIG. As shown in FIGS. 2 and 3, the retractor base 1 has a substantially U-shaped cross section, and winding shaft through holes are formed in the opposing side plates 1a and 1b, respectively. The bobbin 3 which is a winding shaft for winding the shaft is rotatably mounted with the bobbin 3 inserted through these winding shaft through holes.

Engaging internal teeth 2 are formed on the inner peripheral edge of the winding shaft through hole provided in the side plate 1a, and a ring member 4 is juxtaposed outside the winding shaft through hole. . And
On the side plate 1a side of the base 1, an emergency lock mechanism for preventing the webbing from being pulled out in an emergency is arranged. A known take-up spring device 15 is disposed on the side plate 1b of the base, and the bobbin 3 is constantly urged in a direction in which the webbing is taken up.

The bobbin 3 is a substantially cylindrical take-up shaft. A slit opening 28a penetrating in a diametric direction for inserting and holding an end of the webbing is formed in a body 28 around which the webbing is wound. Is provided. And bobbin 3
A flange member 13 formed separately is attached to the outer periphery of the webbing to prevent the webbing from being disturbed. The webbing wound around the bobbin 3 assembled to the retractor base 1 has its entry and exit positions regulated by inserting a webbing guide 41 attached to an upper portion on the back plate side of the retractor base 1. .

Rotation support shafts for rotatably supporting the bobbin 3 protrude from both end surfaces of the bobbin 3, and support shaft pins 6 formed separately on the sensor-side end surface of the bobbin 3. Are press-fitted as rotary shafts. On the sensor-side end surface of the bobbin 3, a support shaft 7 that swingably supports a pawl 16 that is a lock member that can be engaged with the engagement internal teeth 2 is protruded.

The swinging end of the pole 16 has a side plate 1a.
The engagement teeth 16c that can be engaged with the engagement internal teeth 2 are integrally formed. A shaft hole 16a for loosely fitting to the support shaft 7 is formed through the center of the pole 16, and an engagement protrusion 16b located on the swinging end side and a pole A pressing projection 16d located on the side of the rear end 16e protrudes. Since the shaft hole 16a is loosely fitted to the support shaft 7, the pawl 16 is pivotally supported on the support shaft 7 so as to be swingable and movable by a predetermined amount.

An end of the engaging projection 16b of the pawl 16 is inserted into a cam hole 18a formed in a ratchet wheel 18 rotatably supported by the support pin 6. Therefore, the webbing take-up direction the ratchet wheel 18 with respect to the bobbin 3 (in FIG. 3 the direction of arrow X ₁₎
When the cam holes 18a rotate relative to each other,
Is moved radially outward from the rotation center axis of the bobbin 3, so that the pole 16 is connected to the side plate 1a.
The direction of engagement with the engagement internal teeth 2 (arrow Y _{1 in} FIG. 2)
Direction) about the support shaft 7. That is, the pawl 16 is swung in a direction in which the pawl 16 is engaged with the engaging internal teeth 2, and the engaging teeth 16 c of the pawl 16 are engaged with the engaging internal teeth 2. Locking means for preventing rotation is provided.

The ratchet wheel 18 is a ratchet wheel whose center hole is rotatably supported by the support pin 6. The ratchet wheel 18 has an outer peripheral portion for engaging with a sensor arm 53 of a vehicle body acceleration sensor 51. Ratchet teeth 18b are formed. Further, the flange portion 6a of the support pin 6 has a center hole 30a of an inertia plate 30 which is a disk-shaped inertia member for constituting a webbing acceleration sensing means which is an inertial sensing means for sensing a webbing pull-out acceleration. Support.

The lock arm 26 has a gear case 3
4, an engagement claw 26b capable of meshing with the internal gear 34a;
An arm portion 26c for pressing a central portion in the longitudinal direction of the linear sensor spring 25 is provided. Therefore, the lock arm 26 constitutes a locking member that prevents the ratchet wheel 18 from rotating in the webbing pull-out direction by engaging the engagement claw 26b with the internal gear 34a that is the engaged portion.

At the center of a gear case 34 provided outside the inertia plate 30, a shaft support 34b for rotatably supporting the bobbin 3 via the support pin 6 is provided. The flange portion 6a of the support pin 6 abuts on the bottom surface of the shaft support portion 34b, and serves as a positioning surface of the bobbin 3 in the axial direction.

A hanger member 37 is provided on the right side of the gear case 34 in FIG. 3, and a sensor cover 35 is provided outside the side plate 1a covering the gear case 34. The rotation axis of the hanger member 37 coincides with the rotation axis of the bobbin 3 extending parallel to the adjustment axis 71 of the seat back 62. The vehicle body acceleration sensor 51 is provided in the storage portion 3 of the hanger member 37.
8 is detachably attached. Further, the hanger member 37 is provided with a tongue-shaped connecting portion 37b having a long hole 37a serving as a connecting portion with the adjusting means 39 described later, which extends radially outward.

FIG. 4 shows a retractor 100 for a seat belt.
FIG. As shown in FIG. 4, the sensor arm 53 of the vehicle body acceleration sensor 51 has a base end side shaft portion 53 a rotatably supported by the hanger member 37. The sensor arm 53 has a tip 53
From the first position in which b engages the teeth 18b of the ratchet wheel 18 to lock the bobbin 3 in the webbing withdrawing direction, the leading end 53b is disengaged from the teeth 18b. It is swingable about the shaft portion 53a as a center of rotation to a second position where the locking means is not operated. In FIG. 4, the inertia plate 30, the gear case 34, and the sensor cover 35 are not shown.

Next, the operation of the seat belt retractor will be described. When the webbing acceleration sensing means or the vehicle body acceleration sensor 51 which is an inertia sensing means operates in an emergency such as a collision, the lock arm 26 or the sensor arm 53 which is a locking means for preventing the lock operating means from rotating in the webbing withdrawing direction. The rotation of the ratchet wheel 18 in the webbing withdrawing direction is prevented, and the locking means of the retractor is operated.

The webbing of the ratchet wheel 18
After the rotation in the pulling-out direction is blocked,
Is pulled out of the retractor and the ratchet wheel
No. 18 causes a rotation delay with respect to the bobbin 3,
Direction (arrow X₁Direction), the ratchet
The cam hole 18a of the wheel 18 is the engagement protrusion of the pole 16.
16b is moved radially outward from the rotation center axis of the bobbin 3.
Let me do it. Therefore, the pole 16 is centered on the support shaft 7.
The direction of engagement with the engagement internal teeth 2 (arrow Y in FIG. 2) ₁direction)
Is swung and rotated. And further, webbing is lit
When pulled out of the tractor, the engaging teeth 16c of the pole 16
Are meshed with the engagement inner teeth 2.

Next, FIG. 5 shows a schematic side view of the adjusting means of the reclining type seat according to one embodiment of the present invention. As shown in FIG. 5, the adjusting means 39 is provided with the seat portion 63.
And a cam surface 84 having a cam surface extending in the circumferential direction around the adjustment shaft 71, and following the cam surface of the cam plate 84, the hanger member 37 is pivoted only within its rotatable range. A rod member 81 as a transmission member to be linked around
And a guide cylinder 82 which slidably accommodates the rod member 81.

In the seat back 62, teeth 87
A gear 87 as an engaged member provided with a and 87b is provided concentrically with the shaft. The seat seat 63 is provided with an engaging member 88 that engages with the teeth 87a and 87b to fix the inclined position of the seat back. One of the teeth 87a meshes with the engaging member 88 within a proper use range of the seat belt, and the other tooth 87b meshes with the engaging member 88 when the seat back 62 is in a fully flat state. Then, the one tooth 87a and the other tooth 87b
Between them, there is provided a non-engaging portion 87c which has a curved surface and does not mesh with the engaging member 88.

As shown in FIG. 4, the retractor-side end of the guide tube 82 into which the rod member 81 is inserted is such that the retractor-side end of the rod member 81 passes around the connecting portion 37b of the hanger member 37. As you do, retractor base 1
Is fixed to the side plate 1a. Also, a cam plate side end 81a of the rod member 81 is fixedly mounted on the seat back 62 at the cam plate side end of the guide cylinder 82 so that the cam plate side end 81a extends toward the adjustment shaft 71 of the seat back 62. It is positioned on the support plate 86.

The end of the rod member 81 on the retractor side is
A guide member 90 that is connected to the hanger member 37 via a pin 85 that engages with the elongated hole 37a of the connecting portion 37b, and that is attached to the retractor side end of the guide cylinder 82.
Is biased toward the other end by a compression coil spring mounted on the other end. Also, the cam plate side end portion 81a of the rod member 82
Functions as a follower that follows the cam surface of the cam plate 84, and maintains a state of contact with the cam surface of the cam plate 84 by the urging force of a compression coil spring provided in the guide member 90. It is biased to be able to.

The cam plate 84 is a cam surface for moving the cam plate side end 81a of the rod member 81 forward and backward along the straight line C when the seat back 62 tilts. The cam surface of the cam plate 84 is
Interlocking cam surface 84 which is an interlocking area for interlocking the sensor case 30 around its rotation axis in accordance with the inclination angle of
and three non-interlocking cam surfaces 84b and 84c which are connected to the front and rear of the interlocking cam surface 84a and are non-interlocking regions which do not interlock the hanger member 37 with the tilt of the seat back 62. Have been.

When the seat back 62 is tilted within a proper use range of the retractor 100 that can properly restrain the occupant by webbing, the interlocking cam surface 84a changes the orientation of the vehicle body acceleration sensor 51 to the seat back 62.
The advancing / retracting operation of the cam plate side end portion 81a of the rod member 81 is controlled so that the rod member 81 is properly maintained regardless of the inclination state.

When the seat back 62 is in a state where the seat back 62 is tilted forward to the maximum within the proper use range of the seat belt (the state shown in FIG. 1), the front end area of the engagement member 88 and the teeth 87a (clock) (Backward side) meshes with the seat back 6
2 is fixed, and the cam plate side end 81a of the rod member 51 is fixed.
Is located at the front end of the interlocking cam surface 84a, as shown in FIG.

From this state, when the seat back 62 is tilted backward to the maximum within the proper use range of the seat belt as shown in FIG. 6, for example, the engagement member 88 and the teeth 87a are engaged. Then, the cam plate side end 81a of the rod member 81 moves clockwise in FIG. 4 around the adjustment shaft 71 integrally with the seat back 62, and the cam plate side end 81a interlocks as shown in FIG. The cam surface 84a is pushed up. The rod member 81 pushed up by the interlocking cam surface 84a during the backward tilting operation of the seat back 62 causes the hanger member 37 to rotate counterclockwise in FIG. 4 with respect to the bobbin 3 as shown in FIG. The orientation of the vehicle acceleration sensor 51 is maintained in an appropriate state. In this position,
As shown in FIG. 7, the engagement member 88 and the rear end area (counterclockwise direction) of the tooth 87a are in a state of being engaged with each other,
The seat back 62 is fixed. In FIG. 8, the illustration of the inertia plate 30, the gear case 34, and the sensor cover 35 is omitted.

Further, when the seat back 62 is tilted backward from the state of the proper use position of the seat belt shown in FIG. 6 to the state shown in FIG. 9, the engaging member 88 is disengaged as shown in FIG. The seat back 6 is located opposite the portion 87c.
2 is not fixed. Therefore, the occupant cannot sit down in the inappropriate use range of the seat belt. The inappropriate use range of this seat belt is generally a range in which the submarine phenomenon easily occurs. However, since the occupant cannot sit in this range, the occupant does not wear the seat belt in this range. Therefore, it is possible to prevent the use of the seat belt in a situation where the submarine phenomenon easily occurs, and to secure the safety of the occupant.

Further, when the seat back 62 is tilted rearward from the state of improper use of the seat belt shown in FIG. 9 to the full flat state shown in FIG. 11, as shown in FIG.
The teeth 87b of the gear 87 mesh with the engaging members 88, and the seat back 62 is fixed. In the present embodiment, in consideration of the necessity of maintaining a full flat state in a seat in which the seat back is urged forward by the spring force, the seat back 62 is maintained even in the full flat state.
Is configured to be fixed. Here, in the full flat state, the occupant can wear the seat belt in a lying posture, and the submarine phenomenon may occur, but the occupant needs to recognize that the seat belt should not be worn in the full flat state.

When the seat back 62 is tilted forward from the proper use position of the seat belt shown in FIG. 1 to the state shown in FIG. 13, the teeth 87a of the gear 87 and the engaging members 88 are provided as shown in FIG. Are not engaged with each other, and the seat back 62 is not fixed. Note that the adjusting means of the vehicle body acceleration sensor in the present invention is not limited to the above-described embodiment, and may have the configuration of adjusting by its own weight described in the conventional example or another configuration.

[0032]

As described above, according to the reclining type seat of the present invention, the engagement member provided on the seat portion and the inclination provided within the seat back within the proper use range of the seat belt are provided. An engaged member that engages with the engaging member at an angle to fix the inclined position of the seat back is provided, so that the body acceleration can be adjusted by the body acceleration sensor whose orientation is adjusted regardless of the inclined state of the seat back. Even with a retractor that reliably detects and activates the locking means, the engaging member and the engaged member are engaged within the proper use range of the seat belt, and the inclined position of the seat back is fixed. Therefore, the seat back is not fixed within an inappropriate use range of the seat belt where the submarine phenomenon may occur. Therefore, the occupant cannot wear the seat belt and sit down in a posture where the submarine phenomenon can occur, and the submarine phenomenon can be prevented beforehand.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a reclining type seat to which a seat belt retractor according to an embodiment of the present invention is attached.

FIG. 2 is a part of an exploded perspective view of the seat belt retractor shown in FIG.

FIG. 3 is an exploded perspective view of a remaining portion of the seat belt retractor shown in FIG. 2;

4 is a partial side view of the seat belt retractor shown in FIG. 1. FIG.

FIG. 5 is a schematic side view of the adjusting means of the reclining seat shown in FIG. 1;

6 is a side view of the reclining type seat shown in FIG. 1 in a state where the seat back is tilted rearward within a seat belt use range.

FIG. 7 is a schematic side view of the adjusting means of the reclining seat shown in FIG. 6;

FIG. 8 is a partial side view of the seat belt retractor shown in FIG. 6;

FIG. 9 is a side view of the reclining type seat shown in FIG. 6 in a state where the seat back is tilted rearward.

FIG. 10 is a schematic side view of the adjusting means of the reclining type seat shown in FIG. 9;

11 is a side view of the reclining type seat shown in FIG. 9 in a fully flat state.

FIG. 12 is a schematic side view of the adjusting means of the reclining type seat shown in FIG. 11;

13 is a side view of the reclining type seat shown in FIG. 1 in a state where the seat back is tilted forward.

14 is a schematic side view of the adjusting means of the reclining seat shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Retractor base 1a, 1b Side plate 2 Engagement internal teeth 3 Bobbin 4 Ring member 15 Winding spring device 16 Pole 16c Engagement tooth 18 Ratchet wheel 18a Teeth 30 Inertia plate 37 Hanger member 39 Adjusting means 51 Body acceleration sensor 53 Sensor arm 61 Reclining Seat 62 Seat Back 63 Seat Seat 87 Engaged Member 87a Teeth 87b Engaged Part 87b Teeth 88 Engaging Member 100 Retractor for Seat Belt

Claims (1)

[Claims] A locking means for locking rotation of the take-up shaft in a webbing withdrawing direction; a vehicle acceleration sensor for sensing a predetermined acceleration to actuate the locking means; A reclining seat having a retractor provided in the seat back and having an adjusting means for appropriately adjusting regardless of a tilted state; an engaging member provided in a seat seat; a seat belt provided in the seat back; A reclining type seat comprising: an engaged member that engages with the engaging member at an inclination angle within an appropriate use range to fix the inclined position of the seat back.