JPH0436673Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a seat back angle adjustment device for a vehicle seat.

[Prior Art] In vehicle seats, the angle of the seat back is adjusted by the engagement between a gear and a latch, and by releasing this engagement, the seat back rotates in the direction of the seat cushion and is moved forward. It's getting old. The engagement between the gear and the latch is released by pulling up the operating lever, and the operating lever has different stopping positions when the seat bag is locked and when it is unlocked. Therefore, when the seat bag is folded forward, it is necessary to prevent the seat bag and the operating lever from interfering with each other. For this reason, the operating lever is placed outside the seat, or a recess is provided in the seat and the operating lever is housed within the recess.

[Problems to be Solved by the Invention] However, when the operating lever is provided on the outside of the seat, the mounting position is limited in relation to the interior space of the vehicle, and operation becomes difficult. Further, when a recess is formed in the seat, the cushioning material is reduced accordingly, resulting in problems such as poor cushioning properties and poor holding of the seated person.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a seat back angle adjusting device in which an operating lever moves as the seat back is tilted forward.

[Means for Solving the Problems] In order to achieve the above object, in the present invention, a latch of the cushion frame engages with a gear provided at a pivot point of the back frame to lock the back frame. In a seat back angle adjusting device in which the back frame is moved forward when the lock is released and the back frame is moved forward, there is a cam surface that presses the latch in the direction of engagement with the gear, and a cam surface that engages with the latch and moves in the direction opposite to the direction of engagement with the gear. a cam having an engaging portion to be rotated; and a cam attached to the cushion frame so as to be rotatable within a predetermined range, and when the latch is rotated to the upper limit position, the latch is rotated in the anti-meshing direction via the cam; The control lever includes an operating lever that rotates to a lower limit position following the forward movement of the back frame, and a spring that is stretched between the operating lever and the cam and biases the operating lever to rotate in the upper limit direction. It is characterized by the presence of

[Function] Since the present invention is constructed as described above, when the operating lever is pulled up, the lock of the back frame is released and the back frame is moved forward, but along with this forward movement, the operating lever is pushed down. There is.

[Example] Hereinafter, the present invention will be specifically described with reference to the accompanying drawings.

FIG. 1 is a side view of an embodiment of the present invention, FIGS. 2 and 3 are cross-sectional views along lines - and -,
4 to 9 are views showing each part, and FIG. 10 is a side view showing the operation. A main shaft 2 is provided on a base bracket 1 that forms part of the cushion frame, and an arm 3 that forms part of the back frame rotates around the main shaft 2 to adjust the angle of the seat back. It's summery. Further, a gear 4 is attached to the arm 3 by a plurality of rivets 5, and a gear 4 is attached to the base bracket 1.
A latch 6 is attached to the holder. The gear 4 has gear teeth 4a that are engaged with the latch 6 as shown in the fourth figure.
is formed on the edge on the latch 6 side, and a smooth surface 4b is continuously formed on the gear tooth 4a. In the figure, 4c is a shaft hole into which the main shaft 2 is inserted, and 4d is a rivet hole into which a rivet 5 is inserted. The latch 6 has latch teeth 6a that mesh with the gear teeth 4a of the gear 4, as shown in FIG.
is formed and is rotatably supported on a pin shaft 7 provided on the base bracket 1. When the latch 6 meshes with the gear teeth 4a of the gear 4, the back frame is locked at a predetermined angle, and the latch 6 meshes with the gear 4 by a cam 8, which will be described later. Therefore, when the cam 8 comes into contact with the latch 6, an arcuate contact side 6c is formed. Also, when the latch 6 is released from engagement with the gear 4, the return spring 10
The back frame operates forward due to the auxiliary force. This disengagement of the latch 6 is performed by a cam 9, which will be described later.
This is done by. As shown in the second figure, the return spring 10 is a spiral spring, and its inner end is hooked to the main shaft 2, and its outer end is hooked to a hook pin 11 attached to the back frame 3. ing. Note that the return spring 10 is housed in a case 12 attached to the base bracket 1.
Further, as shown in FIG. 1, the base bracket 1 is formed with an arcuate guide slit 13 centered on the main shaft 2, and the hook pin 11 is adapted to slide within this guide slit 13. .

The cam 8 and the cam 9 form a set of cams, and are rotatably attached to the base bracket 1. The cam 8 is shown in FIG. 6, and the cam 9 is shown in FIG. These cams 8 and 9 are integrated by forming protrusions 8a and small holes 9a that fit into each other, and pin holes 8b and 9b into which shaft pins 14 attached to the base bracket 1 are inserted. has been done. Therefore, the cams 8 and 9 rotate integrally around the shaft pin 14. Here, the cam 8 is the contact side 6c of the latch 6.
A cam surface 8c is formed which comes into contact with the latch 6, and the latch 6 is pressed in the direction of engagement with the gear 4 due to the contact with the cam surface 8c. Further, the cam 9 is formed with an engagement hole 9c. The engagement protrusion 6b (see FIG. 5) of the latch 6 is inserted into the engagement hole 9c, and the cam 9 is inserted into the engagement hole 9c.
When the engagement hole 9c comes into contact with the engagement protrusion 6b due to the rotation, the latch 6 rotates in the direction opposite to the direction of engagement with the gear. Further, the cam 9 has a hook piece 9d extending downward, and one end of a tension spring 15 is hooked to this hook piece 9d. The other end of the tension spring 15 is attached to the base bracket 1
The cam 9 is urged to rotate counterclockwise in FIG. 1, and the cam 8 presses the latch 6 in the direction of engagement with the gear 4. do. In Figure 7,
9e is a screw hole, which is a stopper pin 17 described later.
is now being screwed on.

The seat bag is unlocked using an operating lever 1 rotatably attached to the base bracket 1.
8. The operating lever 18 is adapted to rotate around the shaft pin 14, and has a pin hole 18a formed at its lower portion into which the shaft pin 14 is inserted, as shown in FIG. The operating lever 18 has a lever portion 18b extending along the seat cushion, and a knob 19 is attached to this lever portion 18b. Further, an arcuate stopper slit 18c of a predetermined length is formed on the operation lever 18, and the stopper pin 17 screwed onto the cam 9 is inserted into the stopper slit 18c.
It is inserted in c. In FIG. 8, 18d is a hook portion 18 to which one end of a spring 20, which will be described later, is locked.
Denoted at e is a stopper projection that restricts the rotation range of the operating lever 18, and when this stopper projection 18e comes into contact with the cloud-shaped plate 16, the counterclockwise rotation of the operating lever 18 is stopped. As shown in FIG. 1, such an operating lever 18 is attached to the base bracket 1 so as to rotate within a predetermined range, and when it is rotated to the upper limit position, the latch 6 is released from engagement with the gear 4. The seat back becomes free and can be adjusted in angle and moved forward. Further, at the lower limit position, the latch 6 engages with the gear 4, and the seat bag is locked. The spring 20, one end of which is hooked to the hook portion 18d of the operating lever 18, is a torsion spring as shown in FIG.
The coil portion is connected to the operating lever 18 and the cams 8 and 9.
extrapolated to the shaft pin 14, which is the center of rotation of
The other end is a stopper pin 17 attached to the cam 9.
It is hung on. Thereby, the spring 20 connects the operating lever 18 and the cam 9. Spring 20
The end of the cam 9 that is hooked to the stopper pin 17 serves as a fixed end and acts to rotate the operating lever 18 toward the upper limit position. In addition, this spring 2
The spring force of 0 is set to be smaller than the spring force of the return spring 10.

Next, the operation will be explained.

FIG. 1 shows the arm 3 of the back frame, that is, the seat back, in a locked state. This locked state is maintained by the spring force of the tension spring 15.
The cam 8 is biased counterclockwise through the cam 8, and its cam surface 8c presses the latch 6 and meshes with the gear 4. In this state, knob 19
When the operating lever 18 is pulled up while holding it, the end surface of the stopper slit 18c is aligned with the stopper pin 1.
7 is pushed up, the cam 9 to which the stopper pin 17 is attached rotates clockwise. cam 9
Since it is integrated with the cam 8, the cam 8 also rotates in the same direction, and its cam surface 8c separates from the latch 6. As the cam 9 rotates, the end surface of the engagement hole 9c comes into contact with the engagement protrusion 6b of the latch 6, causing the latch to rotate in the anti-meshing direction. This releases the latch 6 from meshing with the gear 4. Therefore, when the operating lever 18 is held at the upper limit position, the seat back is unlocked, making it possible to adjust the angle of the seat back. Further, in this state, the seat back is tilted forward by the spring force of the return spring 10.

Due to this forward tilting, the knob 19 is placed at a position where the smooth surface 4b of the gear 4 faces the latch teeth 6a of the latch 6.
Even if the external force acting on the latch 6a is released, the latch teeth 6a and the gear teeth 4a do not correspond, so the unlocked state is maintained, and the cam surface 8c of the cam 8 comes into contact with the contact side 6c of the latch 6, causing the tension to move. Despite the spring force of the return spring 15, the counterclockwise rotation of the cams 8 and 9 is prevented, and the operating lever 18 is also held at the upper limit position, and the seat back is further moved forward by the spring force of the return spring 10. do. During this operation, when a part of the seat bag comes into contact with the knob 19 at the upper limit position, the operating lever 18 is pushed by the seat bag and rotates in the same direction as the seat bag (see FIG. 10). This operating lever 18
The rotation is performed against the spring force of the spring 20, and the stopper pin 17 rotates from the upper limit position where it contacts one end of the stopper slit 18c formed on the operating lever 18 to the lower limit position where it contacts the other end surface of the stopper slit 18. do. Therefore, since the operating lever 18 rotates following the forward folding of the seat bag, there is no problem in the forward folding operation of the seat bag. Therefore, the degree of freedom in the mounting position of the operating lever is increased, and processing such as forming a recess in the seat is not required. At this lower limit position, the stopper pin 17 engages the hook portion 18d of the operating lever 18.
Since the spring 20 is moving close to the , the distance between both ends of the spring 20 becomes small, and energy for rotating the operating lever 18 toward the upper limit position is stored. Therefore, when the seat bag is rotated in the upright direction, the operating lever 18 is automatically rotated to the upper limit position and stopped by the biasing force of the spring 20. This results in
Since the state is the same as described above when the operating lever 18 is released, the angle of the seat back can be adjusted.

In the above embodiment, the cams are two cams 8 and 9.
However, this may be formed by a single cam.

[Effects of the invention] As explained above, in the present invention, since the operating lever rotates to the lower limit position while remaining in the unlocked state as the seatback is moved forward, it does not interfere with the forward movement of the seatback. Therefore, the operating lever can be provided in the forward folding region of the seat bag, which not only increases the degree of freedom in attaching the operating lever, but also eliminates the need to form a recess in the seat.

[Brief explanation of the drawing]

Fig. 1 is a side view of one embodiment of the present invention, Figs. 2 and 3 are sectional views taken along the - line in Fig. 1, Figs. 4 to 9 are parts diagrams, and Fig. 10 is a side view showing the operation. It is a diagram. 1...Base bracket (cushion frame), 2...Main shaft (pivot position), 3...
Arm (back frame), 4...gear, 6...
Latch, 8...Cam, 9...Cam, 18...Operation lever, 20...Spring.

Claims (1)

[Claims for Utility Model Registration] A latch of the cushion frame engages with a gear provided at a pivot point of the back frame to lock the back frame, and by releasing the engagement, the lock of the back frame is released and the back frame is also locked. A seatback angle adjustment device that operates to move forward, the device comprising: a cam surface that presses the latch in the direction of engagement with the gear; and an engagement portion that engages with the latch and rotates the latch in the direction of engagement or anti-engagement with respect to the gear. A cam is attached to the cushion frame so as to be rotatable within a predetermined range, and when the latch is rotated to the upper limit position, the latch is rotated in the anti-meshing direction via the cam, and the latch follows the forward movement of the back frame. A seat back comprising: an operating lever that rotates to the lower limit position; and a spring that is stretched between the operating lever and the cam and biases the operating lever to rotate in the upper limit direction. Angle adjustment device.