JPS63102713A - Seat reclining apparatus - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a reclining device for an automobile seat.

[Prior Art 1] Conventionally, there is a seat reclining device capable of tilting the seat back to obtain a desired reclining angle, such as the one described in Japanese Utility Model Application Publication No. 59-41153. In this device, as shown in FIG. 5, a base plate 101 is fixed to the seat cushion side A, and an arm plate 103 is rotatably pivoted to the outside of the base plate 101 and fixed to the seat back B. a lower tooth 107 that engages with the upper tooth 105 to hold the arm plate 103 at a desired rotation angle position; and a release lever 109 that engages and disengages the lower tooth 107 from the upper tooth 105.
It is equipped with The arm plate 103 is sandwiched between the base plate 101 and the holder plate 111, and is pivotally attached to the base plate 101 via an arm shaft 113. A release lever is attached to the arm shaft 113 via an E-ring 115 on the outside of the holder plate 111. In addition, the upper tooth 1
05 is in mesh with the lower teeth 107 in the normal state, and the lower teeth 107 are pivoted between the base plate 101 and the holder plate 111 by pins 121, and are fitted into the recesses 123 provided in the lower teeth 107. The cam 125 is engaged. This cam 1
25 is connected to the base plate 1 via the shaft 127.
01 and the holder plate 111. A rod lever 129 is engaged and fixed to the shaft 127 on the outside of the holder plate 111, and a pin rod 131 is implanted at the other end of the rod lever 129. This pin rod 131 is connected to the release lever.
109 into the long hole 133, and is fixed with a retaining nut 135. [Problems to be Solved by the Invention] In this seat reclining device, the meshing state of the lower teeth 107 and the upper teeth 105 is maintained reliably, and the strength is sufficient to withstand the load applied to the seat back B in the event of a vehicle collision, etc. In order to obtain this, the tooth portions of these upper teeth 105 and lower teeth 107 are finished with high precision by broaching, etc., with a tooth profile pitch that provides strength above a predetermined level6. In the engagement of the lower teeth, in order to make the reclining angle of the seat back B smaller, the pitch of the teeth of the upper teeth 105 and the lower teeth 107 must be made smaller, but in this case, the strength of the teeth and the machining accuracy are required. There are limits from this point of view. Furthermore, since the release lever 109 and the lower teeth 107 are engaged through the rod lever 129 and the cam 125, when the seatback B is moved forward, the release lever 109 is pulled up from the normal release lever position. Release lever 1
There is a risk that the seatbelt attached to that seat position may get stuck between 09 and seat cushion A. If the occupant wears the seat belt while the seat belt is caught between the release lever 109 and the seat cushion A, the release lever 109 will be triggered and the seat back will fall forward, which is not favorable for belt attachment. . The present invention has been developed by focusing on the above-mentioned problems, and allows the seat to be reclined in smaller increments than conventional seat reclining devices, and also allows the release lever to remain pulled up even when the seatback is folded forward. The object of the present invention is to provide a seat reclining device that prevents the user from getting into this situation. [Means for solving the problem] A base plate fixed to the seat cushion side, an arm plate rotatably attached to the base plate and fixed to the seat back side, and fixed to the lower end side of the arm plate. a pair of upper teeth having engaging teeth of the same pitch, and coaxially pivoted to the base plate;
a pair of lower teeth that engage with the upper teeth to hold the arm plate at a desired rotation angle position; a pair of cam plates that engage with the pair of lower teeth and are biased in the direction of engagement of the lower teeth by spring means; through the pair of cam plates. It consists of a release lever that engages and releases the upper teeth and lower teeth, and fixes the pair of upper teeth to the arm plate with a pitch shifted by 172 teeth from each other, and a spring between the release lever and the base plate. The structure is such that the means is stretched.

[Effect]

In such a seat reclining device. The upper teeth and lower teeth are disengaged by the release lever via the cam plate, and then the seat back is rotated by a desired angle, and then the engagement teeth of the upper teeth and the lower teeth are brought into engagement again. At this time, since each engagement tooth of the pair of upper teeth has a pitch deviation of 1/2 tooth from each other, the peaks of the engagement teeth of the pair of upper teeth and lower teeth face each other, and the teeth are not aligned. A state of engagement occurs. On the other hand, the upper teeth and lower teeth of the ground assembly are in a meshed state, and the arm plate is in a locked state. Therefore, each engaging tooth can be adjusted in small increments with a pitch of 1/2 tooth, and the seat back can be locked and held at a desired reclining angle. Furthermore, since spring means are separately attached to the cam plate and the release, the release lever will not remain pulled up even if the reclining device is tilted forward). (Example 1 Hereinafter, an example of the present invention will be described in detail with reference to the drawings of FIGS. 1 to 4. As shown in FIG. 1, a seat reclining device R according to an example of the present invention is , a base plate 1 fixed to the seat cushion C side, an arm plate 5 rotatably pivoted on the shaft 3 on the outside of the base plate 1 and fixed to the seat back B side, and a lower end of the arm plate 5. A pair of upper teeth 7.9 fixed to the seat back B
a pair of lower teeth 11.13 for holding and maintaining the lower teeth 11.13 at a desired reclining angular position; a pair of cam plates 15.17 that engage with the lower teeth 11.13; Release lever 1 for engaging and disengaging the upper tooth 7.9 via 17
9, the arm plate 5, and the lower teeth 11.1.
3 and a holder plate 33 that holds the cam plate 1517 between the base plate and the base plate. The arm plate 5 is attached to the seat back B of the seat A.
The base plate 1 is attached to the seat cushion C by bolts 13, and the seat back B is always urged forward (in the direction of the arrow in FIG. 1) by a return spring 21. The return spring 21 is formed in a spiral shape, and its center end 21a is engaged with the shaft 3, and its outer end 21b is engaged with the arm plate 5. A long hole 23 in the shape of a circular arc is formed in the upper part of the base plate 1. A stopper bin 25 faces the long hole 23, and the strut bar bin 25 contacts both ends of the long hole 23, thereby forming the arm plate. It has a stopper function that restricts the rotation range. On the other hand, the stopper bin 2 is located at the bottom of the arm plate 5.
5 and a plurality of fixing pins 27, the pair of upper teeth 7.9 are fixed with a separator 29 in between. With this separator 29, each upper tooth 7.9
A certain interval is ensured between the lower teeth 11 and 13 to prevent interference when meshing with the lower teeth 11 and 13. Note that the lower edge of this separator 29 is lower than the tip of the upper teeth.
It is formed slightly larger. Engaging teeth with the same pitch are formed over a predetermined area on the pair of upper teeth 7.9.
a and 9a are pitches shifted by 1/2 tooth. That is, each upper tooth 7.9 has the same blank shape before being cut, and is processed by shifting the pitch by 1/2 tooth when cutting the teeth, so that the stopper bin 25 When fixed to the arm plate 5 by the fixing pin 27, the pitches are shifted from each other by 1/2 tooth. In this embodiment, the pitch is shifted by 172 teeth when cutting the gears, but when the upper teeth 7.9 are formed in the same shape and are fixed to the arm plate 5, the pitch is shifted by 172 teeth. / It may be installed with a shift of 2 teeth. The lower teeth 11.13 have engaging recesses flb and 13b, and are pivotally connected to the base plate 1 by tooth pins 30. Engagement recess 11b of lower tooth 11.13,
13b, the engagement teeth 11a, 1 of the lower teeth 11.13.
The projections 15a and 17a of the pair of cam plates 15-17 are pressed into engagement so that the teeth 3a of the upper teeth 7.9 engage with the engagement teeth 7a and 9a of the upper teeth 7.9. Cam play 1 to 1
5.17 is pivotally connected to the base play 1-1 via an arm 35 of the release lever 19 which is pivotally connected to the holder plate 33. Also, cam plate 15.1
Spring means 31.31 whose one ends are respectively engaged with the base plate 1-1 and the holder plate 33 are engaged with the projections 15c and 17c of the lower tooth 11.1.
3 and the upper tooth 7.9'):; are biased in the direction of time. The holder plate 33 is located outside the arm plate 5, and the shaft 3,
It is fixed by two pins 30. On the other hand, the operating pin 3 provided on the release lever 19
7 indicates the convex portions 15b, 17 of the cam plate 15.17 when the release lever is rotated upward (in the direction of the arrow in FIG. 2).
It is arranged at a position where it comes into contact with b. In addition, the convex portion 15b
, 17b, the projections 15a, 17a of the cam plate 15.17 are activated by the spring means 31.3.
1, the engagement recess 11b of the lower tooth 11.13,
13b, and the engagement between the upper teeth 7.9 and the lower teeth 11.13 is released. Also, the release lever
A spring means 41 is stretched between 19 and the reinforcing rib at the lower edge of the pace plate 1, and the release lever 19
is always urged toward the lower base plate 1 side. In the seat reclining device configured as described above, in order to adjust the reclining of the seat back B, first operate the release lever 19 in the direction of the arrow in FIG. Release the mesh. Next, the seat back B is tilted forward or backward and set to a desired preferred reclining angle position. At this time, each engaging tooth 7 of the upper tooth 7.9
a and 9a have a pitch deviation of 1/2 tooth from each other, so for example, the engagement teeth 9a and 13a of the - pair of upper teeth 9 and lower teeth 13 have their crests facing each other, and are non-contact. The upper teeth 7 and lower teeth 1 of the ground assembly are in a meshed state.
The engagement teeth 7a and Ila of No. 1 engage with the peaks and valleys of the teeth,
6, that is, the engagement teeth 7a, 9a of the upper teeth 7.9 and the engagement teeth 11a of the lower teeth 11.13, which are in the locked state.
13a has a pitch of 1/2 tooth, allowing small engagement.

【effect】

As explained above, according to the seat device of the present invention,
The lower teeth and upper teeth can be reliably engaged and the reclining angle can be adjusted in small increments. Also, the cam plate and release lever have separate spring means. Even when the reclining device is placed in the forward position, the release lever does not remain in the pulled-up state, and the seat belt does not easily enter between the release lever and the seat cushion.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing one embodiment of the present invention, Fig. 2 is a side view of the same embodiment as seen from the side, and Fig. 3 is II of Fig. 2.
-II sectional view, FIG. 4 is an enlarged view of the engaging teeth of the same embodiment,
FIG. 5 is an exploded perspective view showing a conventional example. C...Seat cushion B...Seat back R...Seat reclining device 1...Base plate 5...Arm plate 7.9...Upper teeth 7a, 9a...Upper tooth engaging teeth 11. 13...
・Lower teeth 11a, 13a...Lower teeth engaging teeth 15.17...
・Cam plate 19...release lever

Claims (1)

[Claims] A base plate fixed to the seat cushion side, an arm plate rotatably attached to the base plate and fixed to the seat back side, and an arm plate fixed to the lower end side of the arm plate and having engaging teeth of the same pitch. a pair of upper teeth and coaxially pivotally connected to the base plate;
a pair of lower teeth that engage with the upper teeth to hold the arm plate at a desired rotation angle position; a pair of cam plates that engage with the lower teeth and are biased by spring means in a direction in which the upper teeth and lower teeth engage; ,
It comprises a release lever that releases the engagement between the upper teeth and the lower teeth via the pair of cam plates, and fixes the pair of upper teeth to the arm plate with a pitch shifted by 1/2 tooth from each other, A seat reclining device characterized in that a spring means is stretched between the release lever and the base plate.