JPH0330037Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a reclining device for an automobile seat, and in particular, a reclining device that is attached to the seat bottom attached to the vehicle body so that the seat back can be adjusted in inclination and can be completely tilted forward. It is related to.

Conventionally, this type of reclining device is disclosed in Japanese Utility Model Publication No. 56-4507, which includes a first pivoting means that is pivotally mounted to be adjustable in tilt, and an inclination angle of an arm that rotates forward when the first pivoting means is released. A device has been provided which automatically unlocks the second pivoting means by sensing the movement of the seat back and allows the seat back to tilt forward.This device has a single operating means and has the advantage of being easy to operate. . However, in the above device, the proximal end of the hook, which moves forward as the arm rotates forward, collides with the protrusion provided on the seat bottom, causing the distal end of the hook to contact the lock pin of the second pivot means. It has a structure in which the engagement is released, and since the protrusion protrudes from the seat bottom, there is a drawback that when the occupant is seated, it hits the buttocks of the occupant.

This invention solves the above-mentioned conventional drawbacks, and instead of providing a protrusion on the seat bottom, a protrusion for unlocking is provided at one end of the operating lever, ensuring that it functions reliably without causing any discomfort to the occupants. It is an object of the present invention to provide a seat reclining device with a simple structure.

Specifically, the present invention provides a seat reclining device in which a seat back is tiltably connected to a seat bottom attached to the vehicle body, in which a lower bracket is fixed to the seat bottom;
A lower part of the upper bracket is rotatably supported on the lower bracket via a first pivot shaft, and an upper part of the upper bracket is rotatably supported on the seat back frame of the seat bag via a second pivot shaft. A sector gear is fixed to the lower end of the upper bracket, and a lock gear that can be freely engaged and detached from the sector gear is swingably attached to the lower bracket via a pin, and the pin is provided protruding from the lock gear. on the other hand,
The operating lever is rotatably attached to the first pivot shaft, and the operating lever is biased by a tension coil spring installed between the operating lever and the lower bracket, and the pin moves when the operating lever is pulled. After disengaging the lock gear and sector gear and tilting the seat bag at an appropriate angle, the pulling pressure on the operating lever is released and the pin 14 is activated to engage the lock gear and sector gear to stop and hold the seat bag at that position. On the other hand, a protrusion is formed at the tip of the operating lever opposite to the operating part, and a hook is rotatably attached to the upper bracket via a pin at a position close to the protrusion, and the hook is A torsion coil spring is used to bias and engage the lock pin protruding from the seat back.
When the seat bag is tilted forward with the operating lever being pulled, the protrusion comes into contact with the hook, rotates the hook and releases it from the lock pin, and rotates the seat bag around the second pivot shaft until it becomes almost horizontal. This invention provides a seat reclining device characterized by having a configuration that allows the seat to be moved and completely reclined forward.

This invention will be explained in detail below with reference to embodiments shown in the drawings.

In the automobile seat, a seat back 3 is connected to a seat bottom 1 attached to the vehicle body side by a reclining device 2 so as to be tiltable.

The reclining device 2 includes a seat bottom 1
A lower bracket 4 is fixed to the lower bracket 4, and a lower part of an upper bracket 5 is rotatably supported on the lower bracket 4 via a first pivot shaft 6. The upper side of the upper bracket 5 is rotatably supported on the seat back frame 3a of the seat back 3 via a second pivot shaft 7.

A sector gear 8 is fixed to the lower end of the upper bracket 5, and a lock gear 9, which can be freely engaged and detached from the sector gear 8, is attached to the lower bracket 4 by a pin 1.
0, and the lock gear 9
A pin 14 is provided protruding from the. Further, an operating lever 12 is rotatably attached to the first pivot shaft 6, and an operating portion 12a is provided at one end of the operating lever 12, and a protrusion 12b is provided at the other end. A tension coil spring 11 is stretched between the operating lever 12 and the lower bracket 4, and the operating lever 1
The second operating section 12a is urged downward. Furthermore, as shown in FIG. 6, an auxiliary plate 20 that is connected to the operating lever 12 and operates integrally is placed in a position across the lock gear 9, with one end freely rotatable on the first pivot shaft 6. It is centrally supported by the The other end of the auxiliary plate 20 and the operating lever 12
As mentioned above, one end of the auxiliary plate 20 is connected by the first pivot shaft 6, and the other end of the auxiliary plate 20 is connected to the operating lever 12 via a shaft 21, and a roller 22 is attached to the shaft 21. . The roller 22 is located at the back (front side) of the lock gear 9 between the operating lever 12 and the auxiliary plate 20. In this way, the auxiliary plate 20 and the operating lever 12 are connected by the two shafts 6 and 21,
When the operating lever 12 is operated, the auxiliary plate 20 is actuated and the operating lever 12 is biased by the coil spring 11, so that the roller 22 attached to the operating lever 12 is also biased by the coil spring 11. An auxiliary plate 20 integral with the operating lever 12 is provided with an engagement groove 13 in which a pin 14 protruding from the lock gear 9 engages.
The shape of the engagement groove 13 is as shown in FIG.
is set to be in a direction that is inclined with respect to the rotation locus of rotation around the first pivot shaft 6.

The relationship between the operating lever 12, the auxiliary plate 20, and the lock gear 9 is as shown in FIG. As shown, the pin 14 of the lock gear 9 is engaged with the deepest part of the engagement groove 13, and the lock gear 9 and the sector gear 8 are engaged, and this state is locked by the roller 22 that comes into contact with the back surface of the lock gear 9. There is. When the operating lever 12 is pulled in the P direction, the auxiliary plate 20 that operates integrally with the operating lever 12 also rotates counterclockwise as shown in FIG. 4. Engagement groove 13 of the auxiliary plate 20
By moving as shown in the figure, the engagement groove 1
3, the pin 14 that was engaged with the inner wall 13a of the engagement groove
is moved outward from the rotational fulcrum (from the first pivot shaft 6) along. Therefore, as shown in FIG. 4, the lock gear 9 rotates about the pin 10 due to the movement of the pin 14, and the lock gear 9 and the sector gear 8 are disengaged from each other. At the position where this engagement is disengaged, the operating lever 12 reaches its pulling pressure limit, and its engagement groove 13
The lock gear 9 is locked by a roller 22 that comes into contact with the back surface of the lock gear 9 in a state in which the pin 14 is engaged with the tip end of the lock gear 9. The sector gear 8 which is disengaged from the lock gear 9 and the upper bracket 5 which is fixed to the sector gear 8 are designed to tilt the seat back 3 forward by the biasing force of a spiral spring (not shown). When the pulling pressure on the operating lever 12 is released, it moves downward due to the biasing force of the tension coil spring 11, and the engagement groove 13 moves while moving the pin 14, which is locked at its tip, into the groove. The lock gear 9 rotates via the pin 14 and meshes with the sector gear 8.

On the other hand, the seat back 3 is provided with a lock pin 15 protruding below the second pivot shaft 7 toward the upper bracket 5, and a hook 16 is rotatably attached to the upper bracket via a pin 17. A torsion coil spring 18 biases the seat back 3, and the hook 16 is constantly engaged with the lock pin 15, thereby locking the seat back 3 so that it does not fall forward or backward when the lock pin 15 comes off the hook 16. Incidentally, in order to make the locking more reliable, a stopper for preventing rotation may be provided as appropriate. In this state, one end of the hook 16 can be freely engaged with and disengaged from the protrusion 12b of the operating lever 12, and is normally in the disengaged position as shown in FIG. As shown in FIG. 5, when the operating lever 12 is operated in the P direction, the protrusion 1
2b is in a position close to the hook 16, and when the seat back 3 is rotated in the direction of slightly tilting forward while the operating lever 12 is under pressure, the position shown in FIG.
As shown in FIG. 2, the hook 16 comes into contact with the protrusion 12b, rotates against the biasing force of the torsion coil spring 18, and is forcibly separated from the lock pin 15. In addition, the positions of the protrusion 12b and the hook 16 indicated by two-dot chain lines in FIG. 2 correspond to those in FIG.

Next, the operation of the above device will be explained.

First, to adjust the inclination angle of the seat back 3, pull up the operating portion 12a of the operating lever 12 in the P direction, and the engagement between the sector gear 8 of the upper bracket 5 and the lock gear 9 of the lower bracket 4 is released. Ru. After tilting the seat back 3 at an appropriate angle in this state, when the operation of the operating portion 12a is released, the lock gear 9 and the sector gear 8 are engaged, and the seat back 3 is held stopped at this position.

Also, if you want to fold the seat back 3 forward,
When the operating lever 12 is kept operating in the P direction, the seat bag 3 is tilted forward by the biasing force of a spiral spring (not shown), and as described above, the hook 16 comes into contact with the protrusion 12b of the operating lever 12. Remove from lock pin 15. Therefore, the seat back 3 and the upper bracket 5 are connected only through the second pivot shaft 7, and the seat back 3 can be rotated about the second pivot shaft 7 as a fulcrum.
As shown by the chain line in the figure, it can be rotated until it becomes almost horizontal and can be completely tilted forward.

In the above embodiment, the seat back 3 is provided with a lock pin 15 and a hook 16 is pivotally supported on the upper bracket 5; however, on the contrary, the seat back 3 is
The hook is twisted and biased in the engagement direction by a coil spring to pivot freely, while the attachment bracket 5
A lock pin may be provided protruding from the hook so that the protrusion of the operating lever comes into contact with the hook.

As is clear from the above explanation, according to the seat reclining device according to the invention, the operating lever is provided with a protrusion, and when the seat back is tilted forward by the biasing force of the spiral spring while the operating lever is operated, the seat reclining device is heated. The seat contacts the hook provided on the pub rack and disengages the hook from the lock pin protruding from the seat back, so it can be tilted forward by operating one operating lever, and the inclination angle can be adjusted, making it easy to operate. It's easy to do. Furthermore, since the protrusion is provided on the operating lever and does not protrude into the seating area under normal conditions, it has the advantage of preventing the occupant from feeling uncomfortable.

[Brief explanation of drawings]

Fig. 1 is a side view showing the reclining device according to this invention, Fig. 2 is an explanatory view of operating the seat bag to tilt forward, Fig. 3 is a sectional view of the main part of Fig. 1, and Fig. 4 is a side view showing the reclining device according to the invention.
The drawings and FIG. 4 show the engagement groove 13 and the lock gear 9.
FIGS. 5 to 5 are drawings showing the engagement and disengagement state between the protrusion 12b of the operating lever 12 and the hook 16, and FIG. 6 is an enlarged view of the main part of FIG. 1. 6 is a view taken along arrow A in FIG. 6, and FIG. 6 is a perspective view of the portion shown in FIG. 6. DESCRIPTION OF SYMBOLS 1... Seat bottom, 2... Reclining device, 3... Seat back, 4... Lower bracket, 5... Upper bracket, 6... First pivot shaft, 7... Second pivot shaft, 8... ...Sector gear, 9
...Lock gear, 12...Operation lever, 12a...
...Operation unit, 12b...Protrusion, 15...Lock pin, 16...Hook.

Claims (1)

[Scope of Claim for Utility Model Registration] In a seat reclining device for tiltably connecting a seat back 3 to a seat bottom 1 attached to the vehicle body, a lower bracket 4 is fixed to the seat bottom 1, and the lower bracket 4 is fixed to the seat bottom 1. The lower side of the upper bracket 5 is rotatably supported via a first pivot shaft 6, and the upper side of the upper bracket 5 is attached to the seat back frame 3a of the seat bag 3 through a second pivot shaft 7.
A sector gear 8 is fixed to the lower end of the upper bracket 5, and a lock gear 9, which can be freely engaged and detached from the sector gear 8, is attached to a pin 10.
is rotatably attached to the lower bracket 4 via the lock gear 9, and a pin 14 is provided protrudingly from the lock gear 9.
An operating lever 12 is rotatably attached to the first pivot shaft 6, and a tension coil spring 1 is attached between the operating lever 12 and the lower bracket 4.
1 biases the operating lever 12, and when the operating lever 12 is pulled, the pin 14 moves to disengage the lock gear 9 and the sector gear 8, and after tilting the seat back 3 to an appropriate angle, the operating lever 12 The suction pressure of the lever 12 is released, the pin 14 is activated, the lock gear 9 and the sector gear 8 are engaged, and the seat bag 3 is stopped and held at that position. While forming the protrusion 12b, the protrusion 12b
A hook 16 is rotatably attached to the upper bracket 5 via a pin 17 at a position close to the seat back 3, and the hook 16 is urged by a spring to engage a lock pin 15 protruding from the seat back 3.
When the seat back 3 is tilted forward while the seat bag 3 is pulled, the protrusion 12b contacts the hook 16, rotates the hook 16, and detaches it from the lock pin 15.
A seat reclining device characterized in that the seat back 3 can be rotated about a second pivot shaft 7 as a fulcrum until it becomes almost horizontal and can be completely tilted forward.