JPS6332742Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a seatback forward tilting locking device for a rotary reclining seat which locks the seatback of the reclining seat in a forward tilting position when the horizontally rotatable rotary reclining seat is horizontally rotated. It is something.

Generally, in a vehicle equipped with a rotating reclining seat that can be rotated horizontally, the front reclining seat can be horizontally rotated by 180 degrees to allow the front and rear seats to face each other. In this case, since the space inside the vehicle is narrow, the reclining seat cannot be rotated horizontally unless the seat back is tilted forward.

The reclining seat in such a vehicle can be locked to the base when rotated 180 degrees and facing forward or backward, but is extremely unstable because it can be rotated horizontally when rotated halfway. Moreover, when the reclining seat is horizontally rotated, for example, approximately 90 degrees and is oriented in the lateral direction of the vehicle body, the body is not supported by the seat back or the like from the front or rear side of the vehicle.

Therefore, if you suddenly start the vehicle or apply sudden brakes while driving while the reclining seat is rotated approximately 90 degrees,
There is a risk that a dangerous situation may occur in which the user of the reclining seat is suddenly forced to lean backwards or forwards.

Therefore, in this invention, a reclining seat with a seat back attached to the rear of the seat cushion so that it can be tilted back and forth is mounted on a base so that it can rotate horizontally, and the lock can be released by operating the rotation lock release lever. In the seatback forward tilting locking device for a rotary reclining seat, the seatback is rotationally biased in a forward tilting direction by a rotational biasing means. a forward tilt prevention device that locks the seat bag in the upright position to prevent the seat bag from tilting forward and is unlocked in conjunction with the unlocking operation of the lever; A forward tilting lock device for preventing the seat from standing up in the forward tilted position is interposed between the seat cushion and the seat back.By using the seatback forward tilting lock device for the rotary reclining seat, the reclining seat can be held horizontally halfway. The reclining seat is characterized in that it is impossible to use it in the rotated state, thereby making it possible to prevent a dangerous situation from occurring.

Next, an embodiment of this invention will be described based on the drawings.

In FIG. 1, 1 is a floor of a vehicle body, 2 is a base fixed on the floor 1, and 3 is a reclining seat arranged on the base 2. In FIG.

The reclining seat 3 includes a seat cushion 4 and a seat back 5, and the seat back 5 is attached to the rear end of the seat cushion 4 via a reclining device 6 so as to be tiltable back and forth. In addition, in FIG. 1, the reclining device 6
Detailed illustration of is omitted.

A substantially disc-shaped rotating plate 7 is fixed to the bottom plate 4a of the seat cushion 4. A bent portion 7a having a substantially L-shaped cross section is formed in the circumferential direction on the inner peripheral edge of the rotary plate 7, and a latch upper projection 7b extending along the outer peripheral edge of the rotary plate 7 is directed downward. Protruded,
A latch insertion hole 8 is bored in the outer peripheral edge of the bottom plate 4a and the rotary plate 7 so as to extend therebetween (see FIG. 2).
Although only one latch insertion hole 8 is shown in the diagram,
It is also provided on the 180° opposite side.

A peripheral flange portion 9a of a rotation guide plate 9 fixed to the upper surface of the base 2 is fitted between the bent portion 7a and the bottom plate 4a, and rotatably supports the rotation plate 7 and the bottom plate 4a. A cylindrical pivot 10 that passes through the center and projects upward is welded to the rotation guide plate 9, and a cylindrical pivot 11 that projects downward is welded to the center of the bottom plate 4a. This pivot 11 is rotatably fitted to the outer periphery of the pivot 10. With this configuration, the reclining seat 3 is mounted on the base 2 so as to be horizontally rotatable.

12 is a seat rotation lock device interposed between the seat cushion 4 and the base 2 (seat base) (FIG. 3). The seat rotation lock device 12 is
A bracket 13 fixed to the frame 2a in the base 2, a pivot 14 rotatably attached to the bracket 13, a latch 15 whose one end is welded to the pivot 14, and a bracket wrapped around the pivot 14. The latch 15 is interposed between the latch 13 and the latch 15.
It has a latch spring 16 which urges the free end of the latch to rotate toward the bottom plate 4a.

A lever 17 for releasing the rotation lock of the seat has a shaft portion 17a pivotally attached to the leg portion 2a. This shaft part 1
A transmission link 18 is fixed to the end of 7a, and a pin 19 is attached to the tip of the transmission link 18 parallel to the shaft 17a.
This pin 19 is inserted into a guide hole 20 formed in the bent portion 15a of the latch 15 (see FIGS. 4 to 6). The guide hole 20 is elongated in a direction substantially perpendicular to the shaft portion 17a, and allows the pin 19 to move in an arc as the transmission link 18 rotates. The leg portion 2b and the transmission link 1 are inserted through the end of the shaft portion 17a.
A lever spring 21 interposed between the levers 8 and 8 biases the transmission link 18 upward.

FIG. 7 is a diagram showing the reclining device 6 in detail. This reclining device 6 includes a plate 22 fixed to the side of the seat cushion 4.
and an arm 2 fixed to the side of the seat bag 5.
It has 3. This arm 23 is pivotally connected to the plate 22 via a pivot 24. The reclining device 6 also includes a reclining tooth 25 formed on the plate 22, a pair of guide members 26, 26 fixed to the arm 23, and a pair of guide members 26, 26 that can move forward and backward toward the reclining tooth 25 side.
It has a lock plate 27 held in between. This lock plate 27 has reclining teeth 2.
5 are provided with teeth 28 and a cam hole 29 which is an arc-shaped elongated hole. This lock plate 27
The reclining teeth 25 constitute a forward tilt prevention device that locks the seat bag 5 in the upright position and prevents the seat bag 5 from falling forward and tilting forward.

Furthermore, the reclining device 6 has an arm 23
a pivot shaft 30 pivotally attached to the pivot shaft 30; a reclining lever 31 and an intermediate lever 32 fixed to the pivot shaft 30;
and a lever 33 pivotally supported on a pivot 30. The arm 32a of the intermediate lever 32 and the arm 23
A spring 34 is interposed between the intermediate lever 32 and the intermediate lever 32 to rotate clockwise in the figure.A pin 35 protruding from the arm 32b of the intermediate lever 32 is inserted into the cam hole 29. It has been inserted. Further, the lever 33 is formed with a circular arc groove 36 centered on the pivot shaft 30, and the arm 23 is formed in this circular groove 36.
A protruding pin 37 is inserted. Lever 3
A spring 33a is also interposed between the lever 3 and the arm 23, and biases the lever 33 clockwise.

38 is a forward tilting lock device for the seat bag 5. The forward tilting lock device 38 includes a bracket 39 fixed to the arm 23 and a lock pin 40 slidably held by the bracket 39. This lock pin 40 has one end attached to the lever 33.
The other end bent portion 40a passes through a long hole 23a formed in the arm 23 and projects toward the plate 22 side. A stopper holder 41 is fixed to this plate 22, and a stopper pin 4
2 slidably passes through the plate 22 and the stopper holder 41. This stopper pin 4
An arc-shaped guide surface 42a is formed on the 2-1 side,
A spring 43 is interposed between the stepped portion 42b of the stopper pin 42 and the stopper holder 41, and the spring 43 biases the stopper pin 42 toward the arm 23 (Figs. 8 and 9).
(see figure).

The seat locking device 12 and the lever 17 for releasing the rotation lock described above have a shaft portion 17a of the lever 17.
link 44 protruding from the link 44 and the lever 3
It is connected to the forward tilting lock device 38 via an interlocking wire 45 whose both ends are pivotally connected to the lever 33. In FIG. 7, a bracket 46 is fixed to the arm 23 and holds a guide tube 47 of the interlocking wire 45.

Next, the operation of the rotary reclining seat having such a configuration will be explained.

The lever 17 for releasing the rotation lock is shown in Figures 3 and 4.
In the figure, when the lever spring 21 is rotated clockwise against the spring force (unlock operation), the transmission link 18 and pin 19 are rotated clockwise, and the tip of the latch 15 rotates around the pivot 14. The latch 15 is rotated downward from the state shown in Fig. 5 as shown in Fig. 6, the tip of the latch 15 is removed from the latch insertion hole 8, and the horizontal rotation restriction (lock) of the reclining seat 3 is released. .

On the other hand, by operating the lever 17 described above, the link 44 rotates in the same direction as the lever 17, and as shown in FIG.
The lever 33 in FIG. 8 is rotated counterclockwise in FIG. 7 via the interlocking wire 45. As a result, the pin 37 protruding from the reclining lever 31 is rotated in the same direction as the lever 33, and the reclining lever 31 and the intermediate lever 32 are rotated counterclockwise. At this time, the intermediate lever 3
The second pin 35 is displaced within the cam hole 29, displacing the lock plate 27 of the forward tilting prevention device upward in the figure, and releasing the meshing (lock) between the teeth 28 and the reclining teeth 25. By this release, the seat back 5 of the reclining seat 3 is tilted forward by a spring (not shown).

Further, when the lever 33 is rotated counterclockwise in FIG. 7 by operating the lever 17 described above,
The lock pin 40 is displaced downward, and the bent portion 40a is displaced to the lower end of the elongated hole 23a.
At the same time, as mentioned above, the reclining seat 3
Since the seat back 5 is tilted forward, the bent portion 40a of the lock pin 40 is rotated counterclockwise about the pivot 24. Along with this rotational displacement, the bent portion 40a slides on the guide surface 42a of the stopper pin 42, pushes the stopper pin 42 toward the seat cushion 4 against the spring 43, and then moves the stopper pin 42. get over. Then, the bent portion 40a is connected to the stopper pin 4.
2, the stopper pin 42 is returned to its original state by the spring 43 to prevent the bent portion 40a of the lock pin 40 from rotating clockwise as shown in FIGS. 8 to 10. As a result, the arm 23 is prevented from rotating clockwise.
It becomes impossible to raise the seat back 5 of the reclining seat 3 and tilt it backward.

When the reclining seat 3 is rotated in the horizontal direction in this state, the tip of the latch 15 rides on the latch upper projection 7b as shown in FIG. Since the forward tilting lock state of 5 is maintained, the reclining seat 3 cannot be used even if the reclining seat 3 is stopped in the middle of rotating 180 degrees.

When the reclining seat 3 is rotated 180 degrees,
The tip of the latch 15 is disengaged from the latch upper protrusion 7b, and the latch 15 is returned to its original state by the spring force of the latch spring 16. The tip is inserted into the latch insertion hole 8 and the reclining seat 3 is inserted. Horizontal rotation is restricted. On the other hand, lever 17
is returned to its original state by the spring force of the lever spring 21, and the lever 33 is rotated clockwise by the spring force of the spring 33a until the pin 37 comes into contact with the lower end of the arcuate groove 36. As a result, the lock pin 40 is returned to its original state, and the forward tilted lock state of the seat back 5 is released, and in this state, the seat back 5 can be erected.

As explained above, in this invention, a reclining seat with a seat back attached to the rear of the seat cushion so that it can be tilted back and forth is mounted on a base so as to be horizontally rotatable, and the rotation lock can be unlocked using a lever for releasing the rotation lock. In a seatback forward tilting locking device for a rotary reclining seat in which a seat rotation locking device for releasing the lock is interposed between the seat cushion and the seat base, the seatback is rotated forward in a forward tilting direction by a biasing means. a forward tilting prevention device which is rotatably biased, locks the seat bag in the upright position to prevent the seat bag from tilting forward, and is unlocked in conjunction with the unlocking operation of the lever; Since the seatback forward tilting lock device of the rotary reclining seat is configured such that a forward tilting lock device that prevents the seatback from rising rearward in the forward tilted position is interposed between the seat cushion and the seatback, the seatback can be reclined easily. If the seat is horizontally rotated halfway, the reclining seat cannot be used, and a dangerous situation can be prevented. Moreover, with just one movement of the lever for releasing the rotation lock, that is, with just the lever's unlocking operation, the seat lock device can be unlocked, the seat bag can be unlocked by the forward tilting prevention device, the seat bag can be tilted forward, and the seat bag can be tilted forward. Four operations such as "locking the seat bag in the forward tilted position" by the locking device can be performed continuously and automatically.

[Brief explanation of the drawing]

Figure 1 is a partial sectional view showing an embodiment of this invention, Figure 2 is a partial sectional view of the rotating plate shown in Figure 1, and Figure 3 is a perspective view of the interior of the base shown in Figure 1. figure,
FIG. 4 is a side view of the seat rotation lock device shown in FIG. 3 viewed from a different angle; FIGS. 5 and 6 are partial sectional views showing the operating state of the seat rotation lock device;
FIG. 7 is a partially enlarged view of the reclining device shown in FIG. 1, and FIG.
9 is a sectional view taken along the - line in Figure 8. Figures 10 and 11 are sectional views taken along the - line in Figure 8.
It is a partial side view which shows the operating state of the reclining device shown in the figure. 2... Base, 3... Reclining seat, 4
... Seat cushion, 5... Seat bag, 6
... Reclining device, 7 ... Rotating plate, 8 ...
Latch insertion hole, 9...Rotation guide plate, 10, 11
... Pivot, 12 ... Seat rotation locking device, 15
...Latch, 16...Latch spring, 17...
...Lever (for releasing rotation lock), 18...Transmission link, 19...Pin, 20...Guide hole, 21...
...Lever spring, 22...Plate, 23...
... Arm, 24 ... Pivot, 25 ... Reclining tooth, 26 ... Guide member, 27 ... Lock plate, 28 ... Teeth, 29 ... Cam hole, 31 ... Reclining lever, 32 ... Intermediate lever, 33
... Lever, 33a ... Spring, 34 ... Spring, 35 ... Pin, 36 ... Circular groove, 37
...pin, 38...forward tilting lock device, 40...lock pin, 42...stopper pin, 43...spring, 45...interlocking wire.

Claims (1)

[Scope of Claim for Utility Model Registration] A reclining seat with a seat bag attached to the rear of the seat cushion so that it can be tilted back and forth is mounted on a base so as to be horizontally rotatable, and the seat can be locked by unlocking the rotation lock lever. In a seatback forward tilting locking device for a rotary reclining seat in which a seat rotation locking device to be released is interposed between the seat cushion and the seat base, the seatback is rotated in a forward tilting direction by a rotational urging means. a forward tilting prevention device which is biased and locks the seat bag in the upright position to prevent the seat bag from tilting forward, and which is unlocked in conjunction with the unlocking operation of the lever;
A seatback forward tilting lock device for a rotary reclining seat, characterized in that a forward tilting lock device that prevents the seatback from rising rearward in a forward tilted position is interposed between the seat cushion and the seatback. .