KR0145983B1 - Reclining device for seat - Google Patents

Abstract

The inclination adjustment device for the seat includes a base plate fixed to the seat cushion and a pivot plate pivotally connected to the base plate via the central axis and fixed to the seat back. The base plate has a guide portion opposite the pivot plate. The tooth member is movably guided by the guide portion. The cam member has a first toothed portion. The cam member is movably guided by the guide of the base plate. The cam member moves the tooth member in the first direction when moved in one direction and in the second direction when moved in the other direction. The pivot plate has grooves opposite the guide portion of the base plate. The recess has a second tooth portion to which the first tooth portion engages when the tooth member moves in the first direction. The recess has a second tooth that the first tooth engages when the tooth member moves in the first direction. The operating lever is pivotally connected to the base plate via the central axis. The mechanism is used to move the cam member in one direction and another direction when operating the operation lever.

Description

Tilt adjuster for seat

1 is a front view of the inclination control device of the first embodiment of the present invention.

2 is a cross-sectional view taken along the line II-II of FIG.

3 is an enlarged view showing a part constituting a main part of the inclination adjusting device of the first embodiment.

4 is a front view of the inclination adjustment device of the second embodiment of the present invention.

5 is a cross-sectional view taken along the line V-V of FIG.

FIG. 6 is an enlarged view showing a part constituting a main part of the inclination adjusting device of the second embodiment. FIG.

7 is a front view of the inclination control device that can serve as a counter device of the inclination control device of the second embodiment at the time of sheet assembly.

8 is a cross-sectional view taken along the line VII-VII of FIG.

9 is an enlarged cross sectional view showing a cam member and associated parts employed in the second embodiment.

FIG. 10 is an enlarged view showing the tooth member and the cam member constituting the main part of the inclination adjusting device of the second embodiment. FIG.

FIG. 11 is a view similar to FIG. 10 but showing another state.

12 is a front view of the inclination adjusting device and the counter device of the second embodiment operatively connected via a connecting pipe;

13 to 16 are enlarged cross-sectional perspective views of various tooth members that can be used in the present invention.

* Explanation of symbols for main parts of the drawings

10A, 10B, 10B ': Tilt adjuster 12: Base plate

14, 114: Central axis 16: groove

18: tooth member 20: cam member

24: Pin 26: pivot board

28: Sector groove 30: Operation lever

32: Return spring 34: Spiral spring

36: Holder pin

The present invention relates to, for example, a tilt adjusting device for a seat, in particular a car seat.

So-called tilt adjustment seats, which provide a comfortable seating position for the seated person, are used in the automotive field. Such a seat is provided with an inclination adjusting device which allows the seat back to be in a locked position with respect to the seat cushion.

Various inclination adjusting devices have been proposed and used conventionally. Some of them include a first toothed member connected to the seat cushion, a second toothed member connected to the seat back, a cam member arranged to selectively establish and release a coupling between the toothed members, and an operation lever for operating the cam member. Some are included.

The seat back can be pivoted to a new inclined position relative to the seat cushion when the engagement of the two tooth members is released while the seat back is inclined relative to the seat cushion and held in the locked position. Then, when the operation lever is released, the two tooth members are engaged at the new angular position corresponding to the angular position of the new seat back. As a result, the seat back is locked at a new predetermined angular position.

However, due to its inherent structure, the above-described conventional tilt adjusting device has the following drawbacks.

First, there is considerable force in adjusting the operating lever when the seat is seated. That is, in this state, adjustment must be made to the considerable force applied to the cam member so that the seat occupant's back does not lean against the seat back. This phenomenon not only degrades the operability in handling the tilt adjusting device but also promotes wear of the teeth of the two tooth members.

Second, because of the large number of related components, the overall tilt control device is complex, structurally massive and expensive. In addition, since many parts have to be assembled in a limited space, the degree of freedom in designing the tilt adjusting device is extremely limited.

Therefore, the present invention provides a tilt adjustment apparatus for a sheet which eliminates the above-mentioned drawbacks.

According to the present invention, there is provided a tilt adjusting device for a seat including a seat cushion and a seat back. The inclination adjusting device includes a base plate fixed to a seat cushion, a pivot plate pivotally connected to the base plate through a central axis, and fixed to a seat back, and first means for forming a guide portion on the base plate opposite the pivot plate; A tooth member movably guided by the guide portion and having a first tooth portion and a tooth member movably guided by the guide portion and moving in one direction and moving the tooth member in the first direction and the other direction; A cam member for moving the tooth member in a second direction when moving to a second direction, and a second tooth member opposed to the guide portion of the base plate on the pivot plate and coupled with the first tooth member when the tooth member moves in a first direction. Second means for forming a groove having a tooth, an operation lever pivotally connected to the base plate via the central axis, and at the time of operation of the operation lever. The reclining apparatus for a seat comprising a third means for moving the cam member in a direction and the other direction is provided.

Other objects and advantages of the invention will be apparent from the following description set forth in connection with the accompanying drawings.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 3, there is shown a tilt control apparatus 10A for an automobile seat which is a first embodiment of the present invention.

The inclination adjustment apparatus 10A shown in the figure is a unit mounted on the left rear side of the relevant seat such as the driver's seat.

As can be seen from FIGS. 1 and 2, the tilt adjusting device 10A includes a generally triangular base plate 12. Although not shown in the figure, the base plate 12 is fixed to the rear left side of the seat cushion of the seat.

As shown in detail in FIG. 2, the central shaft 14 has one end fixed to the base plate 12. Coking technology is used for this fixing method. In other words, the inner end 14a of the central shaft 14 is caulked to be connected to the base plate 12. In order to ensure close connection between them, the front portion 14b of the central shaft 14 is of a cross-sectional ellipse and is thrust supported in a corresponding elliptical hole formed in the base plate 12. Reference numeral 14c denotes a stopper ring which is integrally formed on the central axis 14 for the purpose of being described later.

As shown in Figs. 2 and 3, the base plate 12 is formed with a shallow groove 16 on the outer surface for the purpose of being described later.

As shown in FIG. 3, three protrusions (or embossing portions) 22a, 22b, and 22c which partially border the grooves 16 are formed on the outer surface of the base plate 12. The groove 16 has an arc-shaped inner wall 16a concentric with the central axis 14.

The generally triangular toothed member 18 is movably disposed in the shallow groove 16 with the majority protruding from the groove 16. The tooth member 18 is movable in the radial direction of the recess 16, that is, in the direction of arrow A in FIG. 3. During radial movement of the tooth member 18, the projections 22a and 22b act as an eyepiece for the tooth member 18.

The tooth member 18 is composed of a small head portion 18a facing the central axis 14, an inclined portion 18b facing the projection 22c, and a radial arc outwardly facing tooth arc exterior 18c.

In the shallow groove 16, a cam member 20 movable in the direction of arrow B is also placed. That is, the projection 22c and the inclined portion 18b of the tooth member 18 act as guides for the cam member 20 during the movement of the cam member 20. The pin 24 is fixed to the cam member 20.

As can be seen from FIGS. 1 and 2, the pivot plate 26 is arranged such that the circular base is rotatable about the central axis 14. The upper part of the pivot board 26 is being fixed to the arm member 27 (FIG. 1) fixed to the lower left side of a seat back (not shown).

Due to the provision of the helical spring 34, the pivot plate 26 is biased to pivot counterclockwise in FIG. That is, the inner end of the spring 34 is hung on the central shaft 14, and the outer end thereof is hung on the holder pin 36 fixed to the pivot plate 26.

As can be seen in FIG. 2, the expansion head portion 36a of the holder pin 36 guides the plate 26 during pivotal movement of the pivot plate 26 while the upper semicircular circumference of the base plate 12 ( 12d) (FIG. 1) provide guide means 36b for traveling along it. The upper semicircular circumference 12d is concentric with the central axis 14. The semicircular circumference 12d has stepped portions 12e and 12f that serve as stopper means for suppressing excessive pivot movement of the pivot plate 26.

The circular base of the pivot plate 26 is slidably gripped by three lugs 12a, 12b, 12c formed by pressing the base plate 12. The circular base of the pivot plate 26 is formed with a sector groove 28 concentric with the central axis 14 on the inner surface side.

As can be seen from FIGS. 2 and 3, teeth 28a are formed on the arc-shaped outer wall of the sector groove 28 opposite to the tooth-shaped arc outer portion 18c of the tooth member 18. That is, when the tooth member 18 slides radially outward to the outermost position, the teeth 18c of the tooth member 18 engage with the teeth 28a of the sector groove 28 of the pivot plate 26.

The sector groove 28 is formed at the bottom thereof with a central axis 14 and an arc-shaped slot 28b which is downtown.

As can be seen in FIG. 2, the above-described pin 24 from the cam member 20 penetrates the arc-shaped slot 28b of the pivot plate 26 and engages with the operation lever 30 in the following manner. Done.

As can be seen from FIGS. 1 and 2, the operation lever 30 is arranged such that its base is rotatable about the central axis 14. The base is slidably disposed on the circular base of the pivot plate 26 as shown. Due to the provision of the stopper ring 14c described above, the operation lever 30 is securely held on the central axis 14.

The pin 24 extending from the cam member 20 through the arc slot 28b of the pivot plate 26 is led into a small arc slot 30a formed at the base of the operating lever 30. As shown in FIG. 2, the stop ring 30b is fixed to the protruding end of the pin 24 in order to prevent disconnection between the pin 24 and the operation lever 30. As shown in FIG.

As shown in FIG. 1, the small arc-shaped slot 30a is eccentric with respect to the center axis | shaft 14. As shown in FIG. In other words, the distance between the slot 30a and the axis of the central axis 14 gradually increases as the distance from the right end (see in figure) of the slot 30a increases.

Thus, when the operation lever is pulled upward, the pin 24 slides to the right in the slot 30a to move the cam member 20 and the tooth member 18 radially inward (FIG. 3), As a result, the tooth arc outer side 18c of the tooth member 18 is retracted and separated from the tooth 28a of the pivot plate 26. In this state, the pivot plate 26 can pivot freely with respect to the base plate 12.

The return spring 32 extends between the base plate 12 and the operation lever 30 so as to pivot the operation lever 30 in the counterclockwise direction of FIG. 1 with respect to the central axis 14.

In order to assemble the tilt adjusting device 10A, the operation lever 30 and the pivot plate 26 are disposed on the central shaft 14 to provide an auxiliary assembly, and then the tooth member 18 and the cam member ( 20 is placed in the shallow groove 16 of the base plate 12 and the auxiliary assembly is installed in the base plate 12 where the central shaft 14 is caulked.

Hereinafter, the operation of the tilt control device 10A will be described with reference to FIG. 1. For the sake of understanding, one of the stable states of the seat is described where the heat back retains a certain angular lock position with respect to the seat cushion.

In this stable state, the pin 24 from the cam member 20 is in the leftmost position in the small arc-shaped slot 30a of the operation lever 30, and the tooth member 18 is a tooth (on the pivot side 26). 28a) is maintained.

When the operation lever 30 is pulled upward against the force of the return spring 32, the pin 24 moves the cam member 20 radially inward in the shallow groove 16 of the base plate 12 (first). 3 degrees) to the rightmost position in the arc-shaped slot 30a. Inward movement of the cam member 20 is an operation of separating the tooth member 18 from the teeth 28a of the pivot plate 26. Thus, while the operation lever 30 is continuously towed, the seat back on which the pivot plate 26 is fixed can be freely pivoted. In particular, due to the action of the helical spring 34, the seat back is tilted forward. When the seat back is pivoted back to the predetermined angular position and the operation lever 30 is released, the operation lever 30 is pivoted downward due to the force of the return spring 32. Due to this downward movement of the operating lever 30, the pin 24 slides to the left in the arc-shaped slot 30a to move the cam member 20 and the tooth member 18 radially outward and eventually the tooth member ( 18 engages teeth 28a of pivot plate 26 in a new position. Thus, in this state, the seat back takes a lock position of a new angle with respect to the seat cushion.

The advantages of the first embodiment 10A of the present invention will be described below.

First, the inward movement of the cam member 20 which induces the removal of the tooth member 18 from the teeth 28a of the pivot plate 26 is carried out by lever and lever at the connection between the small arc slot 30a and the pin 24. This is done using practically the principle of lever. Therefore, the operation lever 30 can be adjusted or towed with only a small operation force.

Second, the load applied to the seat back by the occupant while using the seat is mainly supported by the three projections 22a, 22b, 22c of the base plate 12 via the tooth member 18 and the cam member 20. . Thus, the seat back can take a predetermined angle lock position without play. Under the seat back lock state, no load is applied to the operation lever. Thus, the adjustment of the operation lever 30 for unlocking the seat back can be easily performed with only a weak force.

Third, by providing lugs 12a, 12b, 12c in the base plate 12, the expansion head portion 36a of the holder pin 36 and its associated parts, the pivotal movement of the pivot plate 26 is assured without play. It can also be done smoothly. In addition, the pivot plate 26 may be undesirably detached from the base plate 12.

Fourth, the pivot plate 26 and the operation lever 30 do not arrange any member therebetween, and the base is reliably placed on the base plate 12. Therefore, it is possible to prevent the operation of the operation lever 30 and the pivot plate 26 from having a play.

Fifth, radial movement of the tooth member 12 is ensured by providing the projections 22a and 22b on the base plate 12. This ensures engagement and disengagement between the tooth member 18 and the teeth 28a of the pivot plate 26.

4 to 11, there is provided a tilt control device 10B for a vehicle seat which is a second embodiment of the present invention.

The tilt adjusting device 10B shown in the drawing is a unit mounted on the rear left side of the associated sheet.

As can be seen in FIGS. 4 and 5, the tilt adjusting device 10B includes a generally triangular base plate 112. Although not shown in the figure, the base plate 112 is fixed to the rear left side of the seat cushion of the seat.

As can be seen in FIG. 5, one end of the central shaft 114 is fixed to the base plate 112. For this fixation, the caulking technique is adopted. That is, the inner end 114a of the central shaft 114 is caulked to be connected to the base plate 112. In order to ensure a close connection between them, the front portion 114b of the central shaft 114 is of elliptical cross section and is thrust supported in a corresponding circular hole formed in the base plate 112. Reference numeral 114c denotes a stopper ring integrally formed on the central axis 114 for the purpose of the following description.

As shown in Figs. 5 and 6, the base plate 112 is formed with a groove 116 on the outer surface for the purpose of later described.

As shown in FIG. 6, the recess 116 is L-shaped and includes first and second recessed walls 116c and 116d that partially border the opposing parallel walls 116a and 116b and the recess 116. do.

The tooth member 118 is movably disposed in the recess 116 in a state where most of the tooth member 118 protrudes from the recess 116. The tooth member 118 is movable in the radial direction of the recess 116, that is, in the direction of arrow C of the sixth degree. For this radial movement, the toothed member 118 has parallel sides in sliding contact with the opposing parallel walls 116a, 116b of the recess 116. In other words, the opposing parallel walls 116a and 116b act as guides for the toothed member 118 during movement.

The tooth member 118 has a small head portion 118a facing the central axis 114 and a round recess 118b opposite the second recess wall 116d of the recess 116 and a radially outwardly facing tooth arc outside 118c. It consists of

As shown in FIG. 6, in the groove 116 of the base plate 126, the cam member 120 movable in the arrow D direction is also placed. The cam member 120 is slidably and securely disposed in the first concave wall 116c of the recess 116 and the guide which is in sliding contact with the second recess wall 116d of the recess 116. The round part 120b and the round operation part 120c which slides with the tooth member 118 are included. That is, the cam member 120 may pivot about an end point E concentric with the first concave wall 116c of the recess 116. The cam member 120 has a pin 124 fixed to the guide round portion 120b.

As can be seen from FIGS. 4 and 5, the pivot plate 126 is arranged such that the circular base 126a is rotatable about the central axis 114. The upper portion of the pivot plate 126 is fixed to the lower left side of the seat back frame 127. Designated by reference numerals 202 and 204 are the connecting portions which allow the pivot plate 126 to be bolted to the seat back frame 127.

As shown in FIG. 5, the circular base 126a of the pivot plate 126 is slightly raised to securely and rotatably receive the circular boss 112a formed on the base 112 on its inner surface side. It has a circular groove 126b. The central shaft 114 is fixed to the circular boss 112a. The outer surface of the raised circular base 126a is in sliding contact with the stopper ring 114c of the central shaft 114 as shown.

Due to the provision of the helical spring 134, the pivot plate 126 is biased to pivot counterclockwise in FIG. That is, the inner end of the spring 134 is hung on the central shaft 114 and the outer end thereof is hung on the lug 136 fixed to the pivot plate 126.

As can be seen from FIGS. 4 and 5, two pins 200 are fixed to the base plate 112. Each pin 200 (FIG. 5) has an extension ring 200a spaced apart from the base plate 112. As shown in FIG. Pivot plate 126 has a semicircular lower portion 126c that is in sliding contact with the inner surface of expansion ring 200a of pin 200 in the circumferential direction when pivoting plate 126. That is, the expansion ring 200a acts as a guide means while the pivot plate 126 is pivoting. The periphery of the semicircular lower portion 126c of the pivot plate 126 is concentric with the central axis 114.

The semicircular lower portion of the pivot plate 126 has a sector groove 128 concentric with the central side 114 on its inner surface.

It has stepped portions 12e and 12f that serve as stopper means for suppressing excessive pivot movement of the pivot plate 26.

As can be seen in FIG. 4, a tooth 128a is formed on the arc outer wall of the sector recess 128 opposite to the tooth arc outer 118c of the tooth member 118. That is, when the tooth member 118 slides radially outward to the outermost position, the teeth 118c of the tooth member 118 engage with the teeth 128a of the sector groove 128 of the pivot plate 126.

The sector groove 128 is formed at the bottom thereof with an arc-shaped slot 128b concentric with the central axis 114.

As can be seen in FIG. 5, the above-described pin 124 from the cam member 120 passes through the arc slot 128b of the pivot plate 126 and engages with the operation lever 130 in the following manner. Done.

As can be seen in FIGS. 4 and 5, the operating lever 130 is disposed so that its base is rotatable relative to the above-mentioned raised circular base 126 of the pivot plate 126. By providing the stopper ring 114c on the central shaft 114, the operation lever 130 is securely held on the base 126a of the pivot plate 126.

The pin 124 extending from the cam member 120 through the arc slot 128b of the pivot plate 126 is guided into the small arc slot 130a formed at the base of the manipulation lever 130.

As shown in FIG. 4, the small arc-shaped slot 130a is eccentric to the central axis 114. As shown in FIG. That is, the distance between the slot 130a and the axis of the central axis 114 is gradually increased as the distance from the right end (as seen in the figure) of the slot 130a increases.

Thus, when the operation lever 130 is pulled upward, the pin 124 is pushed and slides to the right in the slot 130a to move the cam member 20 clockwise relative to the center point E (first). 6 degrees), the tooth member 118 eventually retracts and separates from the teeth 128a of the pivot plate 126. In this state, the pivot plate 126 can pivot freely with respect to the base plate 112.

The return spring 132 extends between the base plate 112 and the ridge 130b of the operation lever 130 to pivot the operation lever 130 in the counterclockwise direction of FIG. 4 with respect to the central axis 114. It is supposed to be.

As can be seen in FIG. 5, the pin 124 of the cam member 120 has an integral portion 124a extending to the right in the drawing. The integral portion 124a penetrates through the arc-shaped slot 112b formed in the base plate 112. Although not shown, the arc-shaped slot 112b is formed concentrically with the center point E which the cam member 120 pivots (FIG. 6). The integral part 124a is pivotally connected with the link lever 206 mentioned later through the arc-shaped slot 112b.

The method of connecting the pin 124 to the cam member 120 is shown in detail in FIG.

In practice, caulking techniques are used for the connection. As shown in the figure, the cam member 120 has a reduction portion 120d through which the pin 124 passes. The stopper ring 124b is integrally formed on the pin 124, and a separate metal ring 208 is disposed on the pin 124 as shown. The metal ring 208 is pressed or caulked for connection.

Referring to FIG. 5, the central axis 114 has a concentric stud 114d extending to the right in the figure. The connection pipe 210 is rotatably connected coaxially to the stud 114d. The link lever 206 described above is fixed to the connecting pin 210. For this pivot connection between the link lever 206 and the pin 124, the link lever 206 is formed with an opening 206a to which the pin 124 is coupled. The size of the opening 206a is slightly larger than the diameter of the pin 124. Thus, when the pin 124 moves due to the manipulation of the lever 130, the connecting pipe 210 is rotated through the link lever 206.

As shown in FIG. 12, the connecting pipe 210 extends to another inclination adjusting device 10B 'mounted on the rear right side of the seat.

The device 10B 'has a structure substantially the same as that of the device 10B described above except for the arrangement of the parts. Therefore, detailed description of the apparatus 10B 'is omitted. However, for ease of understanding, the parts of the device 10B 'have been given a subscript' after each corresponding reference. The right end of the connecting pipe 210 is connected to the link lever 206 'of the device 10B' corresponding to the link lever 206 of the device 10B.

Deformed tooth members 118A, 118B, 118C and 118D are shown in FIGS. 13, 14, 15 and 16. FIG. The toothed member 118A of FIG. 13 has an integral structure and protrudes from the large base 118A-a and the recess 116 securely slidably accommodated in the recess 116 of the base plate 112. 118B-b. The portions 118B-b are formed with teeth 118c that can engage the teeth 128a of the pivot plate 126. The tooth member 118B of FIG. 14 presses a plate. That is, the tooth member 118B is provided with a pressurized protrusion 118B-b in which the base 118B-a, which is slidably received in the recess 116 of the base plate 112, and the teeth 118c are formed on one side thereof. Include. Teeth member 118C of FIG. 15 is composed of a casting member including base 118C-a and protrusion 118C-b. The protrusion 118C-b is provided with teeth 118c on one side. The tooth member 118D of FIG. 16 includes a base member 118D-a and a tooth member 118D-b coupled via a so-called pin connection. For this connection, first and second pins (unsigned) are formed in the base member 118D-a, and first and second openings (unsigned) are formed in the tooth member 118D-b. In engagement, the pin engages with the opening. Teeth 118c are formed in tooth member 118D-b as shown.

Hereinafter, the operation of the tilt adjusting device 10B will be described with reference to FIGS. 4, 10 and 11. For better understanding, one of the stable states of the seat will be described where the seat back secures a certain angle lock position with respect to the seat cushion.

In this stable state, the pin 124 from the cam member 120 is in the leftmost position in the small arc-shaped slot 130a of the operation lever 130 and the tooth member 118 is the tooth of the pivot shaft 126. 128a).

When the operation lever 130 is pulled upward against the force of the return spring 132, the pin 124 pivots the cam member 120 (FIG. 6) clockwise in FIG. 6 with respect to the center point E in FIG. 6. While moving to the rightmost position in the arc-shaped slot (130a). As shown in detail in FIG. 11, the clockwise movement of the cam member 120 causes an operation to separate the tooth member 118 from the teeth 128a of the pivot plate 126. Thus, while the operation lever 130 is continuously towed, the seat back on which the pivot plate 126 is fixed can be freely pivoted. In particular, due to the action of the helical spring 134, the seat back is tilted forward when the operation lever 130 is operated. When the seat back is pivoted back to a predetermined angle position and the manipulation lever 130 is released, the manipulation lever 130 is pivoted downward due to the force of the return spring 132. Due to this downward movement of the operating lever 130, the pin 124 is pushed to the left in the arc-shaped slot 130a to slide the cam member 120 counterclockwise in FIG. 6 with respect to the center point E. FIG. Pivot. Thus, the tooth member 118 moves radially outward to engage the teeth 128a of the pivot plate 126 at the new position. Thus, in this state, the seat back takes on a new highway lock position with respect to the seat cushion.

When the tooth member 118 engages with the teeth 128a of the pivot plate 126, the round actuating portion 120c of the cam member 120 is formed with the ridges of the tooth member 118 as shown in FIG. 118d). This abutment results in a lock engagement between the tooth member 118 and the cam member 120 to establish a lock state at the new angular position of the seat back.

The operation of the other inclination adjusting device 10B 'will be briefly described with reference to FIGS. 4, 7, 8, 9 and 12. FIG.

When the operation lever 130 is pulled up (FIGS. 4 and 12), the pin 124 is moved in the arc-shaped slot 130a as described above. Movement of the pin 124 is transmitted to the connecting pipe 210 via the link lever 206 and pivots about its axis. Pivot movement of the connecting pipe 210 is transmitted to the pin 124 'of the other tilt adjusting device 10B' by rubbing the link lever 206 '. Thus, for the same reason as described above, the cam member 120 'separates the tooth member 118' from the teeth 128 'of the pivot plate 126' (Fig. 7). In this way, when the operation lever 130 is operated, the inclination adjusting devices 10B and 10B 'are both unlocked, and the seat back is brought into the unlocked state. In this state, the seat back can freely pivot to a predetermined angular position. When the operation lever 130 is released, the devices 10B and 10B 'both establish their locked state so that the seat back is locked at a predetermined angle position.

The advantages of the second embodiment 10B (10B ') of the present invention will be described below.

First, the counterclockwise movement of the cam member 120 leading to the removal of the tooth member 118 from the teeth 128a of the pivot plate 126 is a lever at the connection between the small arc slot 130a and the pin 124. And the principle of lever. Therefore, the operation lever 130 can be adjusted or towed with only a small operation force.

Secondly, the load applied to the seat back by the seated person during use of the seat is mainly supported by the tooth member 118 and the cam member 120 which are kept locked as shown in FIG. Thus, the seat back can take a predetermined angle lock position without play. Under the seat back lock state, no load is applied to the operation lever 130. Thus, the adjustment of the operation lever 130 for releasing the seat back can be easily performed with only a weak force.

Third, as shown in FIGS. 4 and 5, the pins 200 each having an extension ring 200a through which the semicircular lower portion 126c of the pivot plate 126 slides are provided, so that the pivot plate 126 is provided. The pivot movement of) is done reliably and smoothly without play. Since the pin 200 and the stopper ring 114c are provided on the central axis 114, the undesired separation of the pivot plate 126 from the base plate 112 can be reliably suppressed.

Fourth, since the tooth member 118 and the cam member 120 are accommodated in the space formed by both the groove 116 of the base plate 112 and the groove 128 of the pivot plate 126, the tilt adjusting device ( The thickness of 10B (10B ') can be reduced.

Fifth, the groove 128a of the pivot plate 126 that houses the tooth member 118 and the cam member 120 acts as a means for defining the tooth 128a. In this case, the structure of the inclination adjusting device can be miniaturized.

Sixth, as shown in Fig. 12, when two tilt adjusting devices 10B and 10B 'are applied to one sheet, the synchronization mechanism between them can be easily made compact. In practice, the synchronization mechanism may consist only of the pins 124 and 124 ', the link levers 206 and 206', the studs 114d and 114d 'and the connecting pipe 210.

Seventh, as shown in FIGS. 13 to 16, the teeth 118c of the tooth members 118A, 118B, 118C or 118D are formed only in the concave wall portion of the main body of the tooth member. That is, as can be seen in FIG. 13, the large base 118A-a remains below the tooth 118c that is securely and slidably accommodated in the recess 116 of the base plate 112. By this structure, the tooth members 118A, 118B, 118C or 118D can be smoothly moved in the groove 116. In addition, machining of this structure is relatively easy.

Eighth, the pivot plate 126 and the operation lever 130 can seat the base on the base plate 112 without interposing any member therebetween. Thus, the operation lever 130 and the pivot plate 126 do not have a play.

Ninth, since the base plate 112 has a large area where the inner end of the operation lever 130 is pressed, stable support of the operation lever 130 can be ensured without an auxiliary member such as a washer.

Tenth, since the pivot plate 126 is seated on the base plate 112, the engagement between the tooth member 118 and the pivot plate 126 is made sure.

Claims (28)

An inclination adjustment device for a seat comprising a seat cushion and a seat back, comprising: a base plate fixed to a seat cushion, a pivot plate pivotally connected to the base plate via a central axis, and fixed to the seat back; First means for forming a guide portion opposed to the pivot plate, a tooth member movably guided by the guide portion and having a first tooth portion, and movably guided and moved in one direction by the guide portion; A cam member for moving the tooth member in a first direction and a tooth member for moving the tooth member in a second direction, opposite the guide portion of the base plate on the pivot plate; Second means for forming a groove having a second tooth portion to which the first tooth member is coupled when moved in one direction, and pivoting to the base plate through the central axis; Neunghage connected to the operating lever and for a seat reclining apparatus comprises a third means for moving the cam member in one direction and the other direction when said operating lever. The inclination adjustment apparatus for a sheet according to claim 1, wherein the guide portion of the base plate is a recess formed on the base plate. The said third means is a 4th means which defines the arc-shaped slot in the said operation lever eccentric with respect to the said central axis, and the part fixed to the cam member and slidably accommodated in the said arc-shaped slot. Slope adjustment device for a sheet, characterized in that it comprises a pin. The inclination adjusting device for a sheet according to claim 1, wherein the tooth member is arranged to move linearly. 5. The tilt adjusting device for seat according to claim 4, wherein the cam member is disposed so as to move linearly. 6. The inclination adjusting apparatus for a seat according to claim 5, wherein the tooth member has an inclined portion in which a part of the cam member is in sliding contact. 5. The tilt adjusting device according to claim 4, wherein the cam member is arranged to pivot. 8. An inclination control apparatus for a seat according to claim 7, wherein said cam member is arranged to rotate about a predetermined point in the guide portion of said base. 9. The tilt adjusting device according to claim 8, wherein the tooth member has a round groove in which the round operating portion of the cam member is slidably coupled. 4. An inclination control apparatus for a seat according to claim 3, further comprising means for pivoting said operating lever in a direction of moving said cam member in said one direction through said pin. 11. An inclination control apparatus for a seat according to claim 10, further comprising: fifth means for passing the pin to the bottom of the groove of the pivot plate and forming an arc shaped slot concentric with the central axis. 12. The inclination adjusting apparatus for sheets according to claim 11, wherein the first and second tooth portions are concentric with the central axis. 13. The device of claim 12, further comprising guide means for smoothly guiding the pivotal movement of the pivot plate relative to the base plate. 15. The semicircular lower part of claim 13, wherein the guide means comprises: a plurality of isolated lugs formed on the base plate and arranged in a yarn concentric with the central axis, and the pivot plate in sliding contact with the lug. Tilt adjustment device for a sheet comprising a. 14. The pin according to claim 13, wherein the guide means comprises a pin with a head, the head having a head isolated from the pivot plate, fixed to the pivot plate and moving therewith, the head being concentric with the central axis. And a semicircular upper portion of the base plate lying within the space defined by the head of the pin. The inclination adjusting device for a sheet according to claim 1, wherein the central shaft is fixed to the base plate by caulking. 17. The inclination adjusting apparatus for sheets according to claim 16, wherein the central axis has a non-circular cross section, and the base plate has a non-circular opening in which the central axis is accommodated. 4. The apparatus of claim 3, further comprising: means for forming an arc-shaped slot through the extension of the pin and concentric with the central axis in the base plate, a link lever of which one end is pivotally connected to the extension of the pin; Tilt adjustment for a seat, which is arranged to rotate about an axis of the central axis, and one end also includes a connecting pipe to which the other end of the link lever is fixed, and an auxiliary tilt adjusting device to which the other end of the connecting pipe is operatively connected. Device. 2. The toothed member of claim 1, wherein the tooth member has an integral structure and includes a large base which is slidably guided by the guide of the base plate, and a small tooth which is protruded from the large base and the first tooth is formed. Slope adjustment device for seats, characterized in that configured. 2. The toothed member of claim 1, wherein the tooth member is formed of a press-formed plate material, the flat base being slidably guided by the guide part of the base plate, and leaving a groove over the press-formed protrusion, from the flat base. The inclined adjustment device for a sheet, which is formed of a press-formed protrusion which is raised and the first tooth portion is formed. 2. The toothed member of claim 1, wherein the toothed member is formed of a casting member, and includes a flat base slidably guided by the guide portion of the base, and a protrusion formed from the flat base and raised from the flat base. An inclination adjustment device for a seat. The tooth member according to claim 1, wherein the tooth member includes: a base member slidably guided by the guide portion of the base plate, a tooth body detachably mounted on the base member, and the base member and the tooth body. Slope adjustment device for a seat, characterized in that consisting of a pin connection structure detachably connected. The first and second pins of claim 22, wherein the pin connection structure includes first and second pins formed on the base member and first and second pins formed in the tooth body to receive the first and second pins therein, respectively. An inclination adjustment device for a sheet, characterized in that it is composed of an opening. 4. The device of claim 3, wherein the cam member has a reduction portion through which the pin passes, and two stopper rings are provided on the pin to sandwich the reduction portion therebetween. 25. The device of claim 24, wherein one of the stopper rings is integrally formed on the pin and the other stopper ring is caulked connected to the pin. 27. The device of claim 25, wherein a distance between outer surfaces of the two stopper rings is smaller than a thickness of the main body of the cam member. The first annular ridge of the pivot plate having a stopper ring integrally formed on the central axis, an opening through which the central axis passes, and an outer surface through which the stopper ring contacts, and the central axis. And an opening connected by caulking and a second annular ridge of the base plate slidably received in a circular groove formed over the first annular ridge. 28. The tilt adjusting device according to claim 27, wherein the operating lever has a circular opening slidably received on the first annular ridge of the pivot plate.