JPH0547B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention provides a base plate that is fixed to the side surface of a seat cushion, and a lower end side of an arm fixed to the side surface of the seat bag is rotatably attached to the base plate fixed to the side surface of the seat cushion. A seat reclining system in which an upper tooth is provided on the base plate, a lower tooth that engages with the upper tooth is provided on a tooth member swingably attached to a base plate, and the upper tooth and lower tooth are engaged or disengaged by moving the free end side of the tooth member up and down. It is related to the device.

[Prior Art] As shown in FIGS. 7 and 8, a conventional seat reclining device has a base plate 2 fixed to a seat cushion 1, and a lower end side of an arm 4 fixed to a side surface of a seat back 3. An upper tooth 100 is rotatably attached to the lower end of the arm 4, and a lower tooth 102 that engages with the upper tooth 100 is provided on a tooth member 101 that is swingably attached to the base plate 2.
The upper teeth 100 and the lower teeth 102 are engaged or disengaged by moving the free ends of the teeth up and down with a release lever 103.

[Problem to be solved]

In conventional seat reclining devices,
When the tooth member 101 swings, the lower tooth 10
2 and the upper tooth 100 that engages with it interfere with each other, and this interfering part is worn out or damaged, and furthermore, the reclining operation cannot be performed smoothly. In particular, the reliability of the swinging operation of the tooth member 101 could not be expected.

Therefore, this invention ensures the rocking operation of the tooth member, ensures accurate meshing, and
By swinging the tooth member with a cam plate, a material suitable for each material and thickness can be selected, and the seat reclining device is easy to process and has advantages in terms of accuracy, strength, durability, and cost. The purpose is to provide

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention includes a cam plate rotatably attached to a base plate with a pin, and a cam receiving portion formed on the lower surface of the free end side of the tooth member and extending from the cam receiving portion toward the base end side. A recessed portion and a protruding release hook connected to the end of the recess are formed, a lock cam is formed that supports the cam receiving portion on the cam plate, and is fitted into the recess, and an adjacent portion of the lock cam near the tooth member is cut out. A notch is formed, and a lever spring is attached to the tooth member that biases the lower tooth in a direction that constantly engages the upper tooth, and both side walls of the notch push down the release hook when the cam plate rotates in one direction, and the other side of the cam plate The release hook is configured to hold the release hook when rotating in the direction.

[Operation] In this invention, the cam plate is rotated through the release lever or by other means, and when the cam plate is rotated, the lock cam is disengaged from the cam receiving portion of the tooth member, and then the side wall of the cam plate is attached to the release lever. Hit the release hook and press it down. As a result, the tip of the tooth member rotates downward, and as a result, the lower tooth disengages from the upper tooth, and the side wall of the cam plate hits the tip of the cam receiving portion and stops.

The engagement of the lower tooth with the upper tooth is achieved by the tensile force of the lever spring by opening the release lever.

That is, the lower teeth are rotated in the engaging direction by the tensile force of the lever spring, and at the same time, the cam plate combined with the release lever is also rotated in the locking direction. Then, the lock cam of the cam plate pushes up the cam receiving part of the tooth member,
The lever spring of the lower tooth helps the engagement, and the side wall of the lock cam holds the release hook of the tooth member, making the engagement more reliable.

〔Example〕

Preferred embodiments of the present invention will be described below with reference to the drawings.

The lower end side of an arm 4 fixed to the side surface of the seat bag 3 is rotatably attached to the base plate 2 fixed to the side surface of the seat cushion 1, and the lower end outer peripheral edge of the upper tooth member 5 attached to the lower end side of the arm 4 is rotatably attached to the base plate 2 fixed to the side surface of the seat cushion 1. A tooth member 7 that forms an upper tooth 6 in a certain area and is swingably attached to the base plate 2.
A lower tooth 8 that engages with the upper tooth 6 is formed in a certain area at the upper end. A hole 2A is bored in the base plate 2, and one end of the arm shaft 9 is inserted through the hole 2A. An upper tooth member 5 is fixed to the arm 4 with a plurality of rivets 10. Arm 4 and upper tooth member 5
The other end of the aforementioned arm shaft 9 is rotatably inserted into the holes 4A and 5A of the integrated body. A bent portion 11 is formed on the upper tooth member 5, and the bent portion 11 is fitted into a long hole 2B formed in the base plate 2. This bent portion 11 has a notch 1
2 is formed, and the hook portion 14 of the return spring 13 is locked in this notch 12. The hook portion 14 of the return spring 13 is cut toward the center on both sides in the width direction, and this narrow portion is approximately the same width as the notch 12 of the bent portion 11.
The hook portion 14 fits into the notch 12, and the wide portion at the upper end of the hook portion 14 catches on the upper end of the notch 12. The other end of the arm shaft 9 that has passed through the hole 4A of the arm 4 and the hole 5A of the upper tooth member 5 is connected to the hole 15A of the plate holder 15.
It is inserted and caulked. Therefore, the arm 4 and the upper tooth member 5 are sandwiched between the base plate 2 and the plate holder 15, and are rotatable relative to the base plate 2. A mounting hole 2c is formed in the lower side of the base plate 2, and a collar 16 is inserted through the hole 2C and crimped to be mounted.One end side of the tooth member 7 is swingably mounted to the collar 16. That is, tooth member 7
The hole 7A fits into this collar 16 and rotates around the collar 16. A cam receiving part 17 is formed on the lower side of the tip end of the tooth member 7, and a protruding release hook 18 connected to the end of the recessed part 17A is formed near the middle part. Further, one end of a pin 19 is caulked into the hole 2D of the base plate 2, and a release lever 20 and a cam plate 21 are swingably attached to this pin 19. The bent portion 22 of the release lever 20 fits into a recess 23 formed on the lower surface of the cam plate 21, so that the release lever 20 and the cam plate 21 move together. Further, a lock cam 24 is formed on the upper surface of the cam plate 21, and is positioned opposite to the cam receiving portion 17 of the tooth member 7, so as to lock the tooth member 7 when the lower tooth 8 is engaged with the upper tooth 6. It's getting old. That is, when the surface of the lock cam 24 comes into contact with the surface of the cam receiver 17, the tip side of the tooth member 7 is raised and held.
A state in which the lower teeth 8 are engaged with the upper teeth 6 is shown. Furthermore, notches 2 are provided on both sides of the lock cam 24 of the cam plate 21.
5 and 26 are formed, respectively, and the side walls 27 and 28 on both sides of the notch 25 function as follows. That is, the side wall 27 is located opposite to the upper surface of the release hook 18 of the tooth member 7, and the upper surface is pushed during sliding adjustment to release the engagement between the lower tooth 8 and the upper tooth 6 of the tooth member 7. Cam plate 2 is located opposite the bottom surface and serves as a stopper when locking.
1 (see Figures 2 and 3).
(see figure). The side wall 29 of the other notch 26 on the side far from the lock cam 24 is connected to the cam plate 2 when released.
This serves as a stopper that restricts the movement of 1. Furthermore, a lever spring 30 is attached between the tooth member 7 and the bent portion 22 of the release lever 20, and they are pulled together in the locking direction.

When installing the same mechanism on both sides of the seat,
An interlocking shaft 31 is rotatably inserted into the hole 2E of the base plate 2, a gear 32 is fixed to both ends of the interlocking shaft 31, and the gear 32 is configured to mesh with a tooth portion 33 formed on the release lever 20. Bye.
Therefore, by operating either one of the release levers 20 of the mechanism on both sides of the seat, the tooth portion 33 rotates the gear 32 and the interlocking shaft 31, and the other release lever 20 can be operated simultaneously. Become.

A cover 34 is placed on the outside of the base plate 2,
This cover 34 is brought into close contact with the arm 4. This cover 34 is fixed to one end side of the arm shaft 9. Furthermore, armshaft 9
The notch 35 on one end side is the return spring 1.
Insert the center part 36 of 3.

When the components shown in FIG. 1 are assembled, the structure will be as shown in FIG. 4. The seat back 3 rotates within the angular range θ shown in FIG. The cam plate 21 is assembled as shown in FIG. 5, and the rotating part of the arm 4 is assembled as shown in FIG.

In addition, upper tooth 6 and lower tooth 8
is formed by plastically working the peripheral edges of the upper tooth member 5 and the tooth member 7 to increase the thickness of the tooth portion. The thickened portions on which the teeth 6 and 8 are formed are formed to have approximately the same thickness as or less than the thickness of the conventional tooth forming portion. The molding of the thickened part is
This is carried out at the same time as the teeth 6 and 8 are formed by a hot gear rolling method. In this processing, the portion to be thickened is heated using high frequency waves or the like, and immediately after heating, rolling forming gears that mesh with the respective teeth 6 and 8 are pressed and rotated. Also,
When molding the teeth 6 and 8 when molding the thickened portion, it is preferable that walls be formed on both sides of one of the teeth 6 or 8 in the width direction (thickness direction). If a wall like this is made, twos 6, 8
There is no fear that the meshing between them will shift in the width direction.

According to the embodiment of the present invention configured as described above, by pulling up the release lever 20, the cam plate 21 is also rotated via the bent portion 22. When the cam plate 21 rotates, the lock cam 24 comes off the cam receiving part 17 of the tooth member 7, and the side wall 29 hits the tip of the cam receiving part 17 and stops. As a result, the lower tooth 8 disengages from the upper tooth 6, and the side wall 27 tries to push down the release hook 18. Therefore, the tip of the tooth member 7 rotates downward. At this time, adjust the seat back 3 to the desired position of the seated person, and once the adjustment is completed, pull up the release lever 20 and release the lever spring 3.
0 causes the tooth member 7 to rise again, and the lower tooth 8 and upper tooth 6 engage with each other at a desired position. At this time, the lock cam 24 moves smoothly from the recessed part 17A to the cam receiving part 17, so that the teeth of the lower teeth 8 and upper teeth 6 are corrected for interference with each other, and the tooth members 7 are brought into accurate engagement. When the tip is raised and the side wall 28 comes into contact with the lower surface of the release hook 18 and attempts to lift it, the engagement is firmly maintained. When the release lever 20 is pulled up and no force is applied to the seat back 3 to push it backward, the seat back 3 will fall forward due to the spring force of the return spring 13.

In the embodiment described above, the release lever 2 is used as a means for rotating the cam plate 21.
0 is used, but it goes without saying that the lever portion may be formed to extend from the cam plate 21, or the lever portion may be attached to the cam plate 21.

〔effect〕

As explained above, according to the present invention, the cam plate is rotatably attached to the base plate with a pin, and a cam receiving portion and a cam receiving portion are formed on the lower surface of the free end side of the tooth member and extending from the cam receiving portion toward the base end side. A recessed portion and a protruding release hook connected to the end of the recessed portion are formed, and a lock cam is formed to support the cam receiving portion on the cam plate and fit into the recessed portion, and an adjacent portion of the locking cam near the tooth member is cut out. A notch is formed, and both side walls of the notch push down the release hook when the cam plate rotates in one direction, and hold the release hook when the cam plate rotates in the other direction. It has a remarkable effect. In other words, the rotation of the cam plate is transmitted to the tooth member, and since the side walls of the cutout of the cam plate rotate the tooth member downward and upward, the cam plate and The means for rotating this allows selection of materials suitable for each material, thickness, etc., and processing can be done separately and is relatively easy, as well as being efficient in terms of accuracy, strength, durability, and cost. is also advantageous. In addition, since the tooth member is constantly exerted a force to rotate in the locking direction by the lever spring, the movement is smooth without applying excessive force to the cam plate, and the tooth member can be operated accurately to ensure reliable engagement and engagement. The cancellation will take place.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing a preferred embodiment of the present invention, Fig. 2 is an explanatory view showing the state when the tooth member is engaged with the cam plate, Fig. 3 is an explanatory view when the tooth member is disengaged, and Fig. 4 is a side view of the assembled state, Figure 5 is a sectional view taken along the line of Figure 4, and Figure 6 is
The figures are a sectional view taken along the line of FIG. 4, FIG. 7 is a side view of the conventional device, and FIG. 8 is a diagram illustrating the meshing of the conventional device. 1...Cushion sheet, 2...Base plate, 3
...Seat back, 4...Arm, 6...Upper tooth, 7...Tooth member, 8...Lower tooth, 17...Cam receiver, 17A...Recess, 18...
...Release hook, 19...Pin, 21...Cam plate, 22...Bent part, 23...Concave part, 24
... Lock cam, 25 ... Notch, 27, 28 ...
...Side wall, 30...Lever spring.

Claims (1)

[Scope of Claims] 1. The lower end side of the arm fixed to the side surface of the seat bag is rotatably attached to the base plate fixed to the side surface of the seat cushion, and an upper tooth is provided at the lower end of the arm so that it can swing on the base plate. In a seat reclining device, a lower tooth that engages with an upper tooth is provided on a tooth member attached to a tooth member, and the upper tooth and lower tooth are engaged or disengaged by moving the free end of the tooth member up and down with a release lever. a cam receiver, a recess formed from the cam receiver toward the proximal end, and a protruding release hook connected to the end of the recess on the lower surface of the free end of the tooth member; Form a lock cam that supports the cam receiving part on the cam plate and fits into the recess, and cut out the adjacent part of the lock cam near the tooth member to form a notch, so that the lower teeth of the tooth member are always engaged with the upper teeth. A biasing lever spring is attached, and both walls of the notch push down the release hook when the cam plate rotates in one direction, and hold the release hook when the cam plate rotates in the other direction. Seat reclining device. 2. A release lever is rotatably attached to the pin to which the cam plate is attached, and the bent part formed on the release lever is fitted into the recess formed in the cam plate, so that the release lever and cam plate are rotated together. The seat reclining device according to claim 1, characterized in that the seat reclining device is configured to move.