JPH07137564A - Seat back forward tilting device of seat of automobile - Google Patents

Abstract

PURPOSE:To tilt a seat back to the front side safely, by applying a braking to the forward tilting of the seat back by deforming a clutch spring in the diameter extending direction, when a latch is released and the seat back is going to tilt forward by an energizing spring, so as to increase the friction force with the inner peripheral surface of a case. CONSTITUTION:When a knob is pulled and a latch is released, a seat back in the erecting posture is going to tilt forward by the elastic force of an energizing spring, and a tilting holding shaft 7a is rotate counterclockwise following the forward tilting. As a result, a driving body 35 serration-connected to the holding shaft 7 is rotated in the same direction, the engaging surface 43a of one side projection piece 41a pushes one side engaging piece 46a of a spring body 45 so as to rotate the spring body 45 in the same direction, and the other side engaging piece 46b of the spring body 45 presses the other side latch 33b of a clutch spring 32 from the outer side. As a result, the clutch spring 32 extendes its diameter, and the friction force with the inner peripheral surface of a case 31 is increased so as to lock unrotatable, and a braking of the forward tilting of the seat back 3 is applied, so as to tilt the seat back 3 to the front side slowly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backrest forward leaning device capable of leaning forward the backrest of a vehicle seat at a slow speed.

[0002]

2. Description of the Related Art The seat back of a vehicle is tilted forward by, for example, connecting the trunk to the passenger compartment by tilting the rear seat back, or by using a two-door vehicle to get into the rear passenger compartment. The front seat backrest may be tilted forward.

As a conventional backrest tilting device, a biasing spring for pivotally supporting the backrest on the seat portion of the seat so as to tilt forward and swinging the backrest in the forward tilting direction is provided, and the backrest is always biased. It is known that the device is latched in a standing posture against the force and is biased forward by the release of the latch.

[0004]

However, since the conventional apparatus has a structure in which the backrest leans forward rapidly due to the urging force, for example, an article placed on the seat of the seat is broken,
Alternatively, there is a risk of pinching an infant, which is a safety issue.

[0005]

SUMMARY OF THE INVENTION A vehicle seat backrest tilting device according to the present invention has been completed in view of the above points, and is concentric with a tilting support shaft that rotates integrally with the backrest. A circular case is fixed, and a circular clutch spring is tightly fitted inside the case to form inward hooks at both ends of the clutch spring that are spaced apart in the circumferential direction. A hollow driving body that is rotatable integrally with the tilt support shaft is fitted to the both ends of the notch groove formed on the outer periphery thereof in the circumferential direction so that they can be engaged with the engaging portions of the clutch spring, respectively. Correspondingly, the inner circumference of the drive body is fitted with arcuate spring bodies with outward facing engagement pieces formed at both ends in the circumferential direction, and the rotation direction when the backrest of the spring body leans forward Of the engaging piece on the front end side of the clutch spring between the one engaging portion of the clutch spring and the corresponding end surface of the driving body. It has a structure which is respectively fitted into the engaging pieces on the outside of the other engaging portion of the clutch spring.

[0006]

The present invention operates as follows. When the latch is released, the backrest tries to lean forward due to the biasing force of the biasing spring,
When the tilt support shaft rotates accordingly, the driving body that rotates integrally with the tilt support shaft pushes the engaging piece on the front end side of the spring body to rotate it, and the engaging piece on the rear end side of the spring body causes the clutch to move. The corresponding catch of the spring is pressed from the outside. As a result, the clutch spring deforms in the radial direction and the frictional force with the inner peripheral surface of the case increases, so that the clutch spring is locked so that it cannot rotate, and braking is applied to the forward lean of the backrest.

When torque is continuously applied to the tilt support shaft,
The drive body rotates while elastically deforming the spring body, and the engagement piece on the front end side of the spring body presses the corresponding hooking portion of the clutch spring from the inside. As a result, the clutch spring is deformed in the diameter reducing direction, the frictional force with the inner peripheral surface of the case is reduced, and the clutch spring rotates with the drive body. Meanwhile, the spring body elastically restores.

After that, the above-described operation is repeated, and braking is appropriately applied during forward leaning of the backrest to gently lean forward.

In the case of causing the backrest, as the driving body rotates in the opposite direction, one of the engaging portions of the clutch spring is constantly pressed from the inside to reduce the diameter, so that the backrest does not receive resistance. Wake up smoothly.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a trunk through opener system for connecting a trunk to a passenger compartment by tilting a backrest of a rear seat of a vehicle forward will be described with reference to FIGS.

In FIG. 1, reference numeral 1 denotes a rear seat installed on the body of an automobile, which is fixed to a bearing portion of a lower bracket 5 fixed to a rear side surface of a seat portion 2 thereof and to a lower side surface of a backrest 3. A tilting support shaft 7 protruding from the upper bracket 6 is fitted to the backrest 3 so that the backrest 3 is tiltably supported, and an urging spring 9 composed of a spiral spring is mounted around the tilting support shaft 7. The inner end is fitted into a split groove formed on the front end surface of the support shaft 7, and the outer end is hooked on a hooking pin 10 projecting from the lower bracket 5, so that the backrest 3 is elastically actuated by an urging spring 9. Is biased in the forward tilt direction.

A ratchet wheel 11 having two notches 12 is fixed to the tilting support shaft 7, and a hook lever is provided on the lower bracket 5 for hooking the notches 12 at its upper end. 14 is swingably supported by a shaft 15, and a clockwise swinging force is generated by an elastic force of a tension spring 17 mounted between the shaft 15 and a tongue piece 16 formed on the front portion of the lower bracket 5. Is being urged.

Reference numeral 19 is a control cable in which an inner cable 21 is inserted into a flexible outer tube 20, one end of the outer tube 20 is located in the lower bracket 5, and the other end is located inside the opening of the trunk 23. Inner cables 21 projecting from one end of the outer tube 20 are connected to the lower ends of the above-mentioned latching levers 14, respectively, and are fixed by fasteners 24 and 25, respectively, and a knob 26 is attached to the inner cable 21 projecting from the other end. A compression spring 27 is mounted between the knob 26 and the fixture 25 to apply tension to the inner cable 21.

The backrest 3 is always held in an upright position by the hook portion of the latch lever 14 latching on the notch 12 on the lower side of the ratchet wheel 11, and the trunk 23 is opened to pull the knob 26. Then, the inner cable 21 is pulled, the latching piece 14 swings counterclockwise, the latch of the ratchet wheel 11 is released, and the backrest 3 is tilted forward by the elastic force of the biasing spring 9. .

Next, the mechanism of the portion for gently tilting the backrest 3 forward will be described with reference to FIGS.

On the opposite side surface of the rear seat 1, the lower bracket 5a and the backrest 3 are attached to the seat portion 2 in the same manner as described above.
The upper brackets 6a are fixed to the
A tilting support shaft 7a having serrations formed on the tip side thereof is provided so as to project, and is fitted into the bearing hole 30 of the lower bracket 5a.

On the surface of the lower bracket 5a, a circular case 31 whose one surface is opened is fixed concentrically with the tilt support shaft 7a. A clutch spring 32, which is a torsion spring, is tightly fitted in the case 31, and inward locking portions 33a and 33b are formed at both ends of the case 31 that are spaced apart in the circumferential direction.

Further, in the case 31, a driving body 35 formed by projecting a shaft portion 37 on the front surface of the substrate 36 is provided.
The serration portion of the tilt support shaft 7a is fitted in the serration hole 38 formed in the tip end surface of the base plate 36,
A shaft 39 protruding from the rear surface is fitted in the bearing hole 40 of the case 31 so as to be integrally rotatable with the tilt support shaft 7a.

On the front surface of the substrate 36 of the driving body 35, two projecting pieces 41a, 41b having a substantially fan-shaped cross section are formed at positions opposite to each other with the shaft center interposed therebetween.
Surfaces 4 adjacent to each other with one notch groove 42 between b
3a and 43b are engaging surfaces corresponding to the engaging portions 33a and 33b of the clutch spring 32 described above, respectively.

On the inner circumferences of both the projecting pieces 41a, 41b of the driving body 35, a leaf spring is bent in an arc shape, and outwardly engaging pieces 46a, 46b are formed at both ends in the circumferential direction. Spring body 4
5 is fitted, and one engaging piece 46a is engaged with the clutch spring 32.
Between one of the engaging portions 33a and the corresponding engaging surface 43a of the drive body 35, and the other engaging piece 46b is fitted on the outside of the other engaging portion 33b of the clutch spring 32, respectively. There is.

Next, the operation of this embodiment will be described. As described above, when the trunk 23 is opened and the knob 26 is pulled, the latch of the ratchet wheel 11 is released, and the backrest 3 in the standing posture tries to lean forward due to the elastic force of the biasing spring 9. When the tilt support shaft 7a rotates counterclockwise in FIG. 4 (A), the serration-coupled drive body 35 rotates in the same direction, and the engagement surface 43a of one projection piece 41a is connected to one side of the spring body 45. The engaging member 46a is pressed to rotate the spring body 45 in the same direction, and the other engaging member 46b of the spring member 45 presses the other engaging portion 33b of the clutch spring 32 from the outside.

As a result, the clutch spring 32 is deformed in the radial direction and the frictional force with the inner peripheral surface of the case 31 is increased, so that the clutch spring 32 is locked so as not to rotate and braking is applied to the forward lean of the backrest 3.

When torque is continuously applied to the tilt support shaft 7a, the drive body 35 rotates counterclockwise while elastically deforming the spring body 45, as shown in FIG.
One of the engaging pieces 46a presses one of the engaging portions 33a of the clutch spring 32 from the inside. As a result, the clutch spring 32 is deformed in the diameter reducing direction, the frictional force with the inner peripheral surface of the case 31 is reduced, and the clutch spring 32 can rotate together with the driving body 35. Meanwhile, the spring body 45 elastically restores.

After that, the above operation is repeated, and while the backrest 3 is leaning forward, appropriate braking is applied and the backrest 3 is gently leaning forward.

When the backrest 3 is raised, the driving body 35 rotates clockwise in FIG. 4, and accordingly, the engaging surface 43b of the other projecting piece 41b of the driving body 35 causes the other engaging portion of the clutch spring 32 to engage. Since 33b is always pressed from the inner side to be in a reduced diameter state, the drive body 35 rotates without receiving the resistance with both the clutch spring 32 and the spring body 45, and the backrest 3 is smoothly raised.

In the above embodiment, the mechanism for biasing the backrest 3 forward and the mechanism for suppressing the forward lean to a slow speed are separately provided on both sides of the rear seat 1, but on one side of the seat 1. It is also possible to install them in series.

Further, the present invention can be similarly applied to an apparatus for tilting the backrest of the front seat forward so that the passenger can get into the rear compartment of a two-door vehicle.

[0028]

As described above in detail, according to the present invention, the backrest of the seat can be tilted forward at a slow speed and can be placed on the seat portion as if it was tilted forward at a rapid speed. It is possible to prevent smashing items and pinching infants,
It has the effect of improving safety.

[Brief description of drawings]

FIG. 1 is a perspective view showing a forward leaning biasing mechanism of a backrest according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a forward lean speed suppressing mechanism portion.

FIG. 3 is an exploded perspective view of its internal components.

FIG. 4 is an explanatory diagram of its operation.

[Explanation of symbols]

1: Rear seat 2: Seat part 3: Backrest 5, 5a:
Lower bracket 6, 6a: Upper bracket 7, 7a: Tilt support shaft 9: Bias spring 11: Claw wheel 14: Latch lever 19: Control cable 31: Case 3
2: Clutch springs 33a, 33b: Hooking portion 35: Driving body 41a, 41
b: protrusion 42: notch groove 43a, 43b: engaging surface 4
5: Spring body 46a, 46b: Engagement piece

Claims (1)

[Claims] 1. An urging spring for pivotally supporting a backrest in a seat portion of a vehicle for tilting the seatback forward and swinging the seatback in a forward tilting direction is provided, and the seatback is always resistant to the biasing force. In a backrest forward tilting device for a vehicle seat, which is latched in a standing posture and is tilted forward by releasing the latch, a tilting support shaft that rotates integrally with the backrest is circularly concentric with the tilting support shaft. A case is fixed, and a circular clutch spring is tightly fitted in the case to form inward locking portions at both ends of the clutch spring that are spaced apart in the circumferential direction. A hollow driving body that is rotatable integrally with the tilting support shaft is fitted, and both end surfaces in the circumferential direction of a notch groove formed on the outer periphery of the driving body are engaged with the engaging portions of the clutch spring, respectively. As much as possible, on the inner circumference of the driving body, at both ends in the circumferential direction And it fitted the spring body arcuate forming the engagement piece orientation,
The engaging piece on the front end side in the rotation direction when the backrest of the spring body tilts forward is provided between the one engaging portion of the clutch spring and the corresponding end surface of the driving body on the rear end side. An apparatus for leaning a backrest of a seat of an automobile, characterized in that engaging pieces are respectively fitted outside the other hooking portions of the clutch spring.