JPH0767746A - Car seat with arm rest - Google Patents

Abstract

PURPOSE:To provide a car seat with arm rests which can always be kept horizontal because the arm rests automatically rotate linking with tilting of the seat back. CONSTITUTION:On the seat back side, installed is the arm rest driving device 40 to rotate the arm rests by a driving power of the electric motor 42 as a driving device, and the drive adjusting device 50 is installed on the arm rest side. The tilt angle is measured by the drive adjusting device 50 to adjust the power and the direction of drive of the electric motor 42, so that the arm rests can always be kept horizontal to the direction of gravity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat with an armrest in which an armrest is provided on a side portion of a seat back which is tiltable.

[0002]

2. Description of the Related Art Conventional vehicle seats with armrests are
When the seat back is rotated with respect to the seat cushion by the seat reclining operation and its tilt angle is changed, the attachment angle of the armrest with respect to the seat back does not change. In such a vehicle seat, when the seat back is tilted rearward, the armrest faces upward, and there is a problem that the usability of the seat occupant when using the armrest is extremely poor.

Therefore, it has been proposed to provide a mechanism for returning the armrest to a horizontal state by a fine adjustment operation of a manual lever when the tilt angle of the seat back is changed.

[0004]

However, in the vehicle seat provided with the above-mentioned mechanism, the tilt angle of the armrest must be manually adjusted each time the tilt angle of the seat back is changed. The adjusting operation was very troublesome.

The present invention has been made to solve the above-mentioned problems of the prior art, and its purpose is to:
An object of the present invention is to provide a vehicle seat with an armrest in which the armrest automatically rotates in association with the tilting of the seatback so that the armrest can always be held in a horizontal state.

[0006]

In order to achieve the above object, the present invention is a vehicle seat with an armrest in which an armrest is rotatably provided on a seat back configured to be tiltable by a driving force of a driving means. Then, on the seat back side, an armrest drive device that rotationally drives the armrest by the driving force of the drive means is provided,
Further, drive adjusting means is arranged on the armrest side, and the drive adjusting means detects the tilt angle of the seat back to adjust the drive amount and drive direction of the drive means so that the armrest can always maintain a horizontal state. It is characterized by having done.

[0007]

According to the present invention, the armrest driving device and the drive adjusting means cooperate with each other to automatically rotate the arm bracket in association with the tilting of the seat back, thereby keeping the armrest always in a horizontal state. it can.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described based on the embodiments shown in the drawings.

FIG. 1 is a perspective explanatory view of a vehicle seat with an armrest, FIG. 2 is an exploded perspective explanatory view of an armrest drive device and drive adjusting means, FIG. 3 is a front view explanatory view of what is shown in FIG. 2, and FIG. 4 is FIG. IV-IV view of FIG. 5, FIG. 5 is a front view of a main part of the drive adjusting means, and FIG. 6 is a front view of an armrest storage mechanism.

In the figure, E is a vehicle seat with an armrest, and an armrest 30 is rotatably provided on a seat back 20 which is configured to be tiltable by a driving force of an electric motor 42 as a driving means.

The present invention is particularly applicable to the seat back 2
The armrest 3 is moved to the 0 side by the driving force of the electric motor 42.
An armrest drive device 40 for rotating 0 is provided,
Further, drive adjusting means 50 is arranged on the armrest 30 side, and the drive adjusting means 50 detects the tilting angle of the seatback 20 to adjust the drive amount and drive direction of the electric motor 42, thereby moving the armrest 30 in the horizontal direction of the vehicle body or The feature is that it can always maintain a horizontal state with respect to the direction of gravity.

Further, the structure of the present invention will be described in detail.

The vehicle seat E with armrests includes a seat cushion 10, a seatback 20 tiltably attached to the seat cushion 10 by a seat reclining device (not shown), and an armrest on a side portion of the seatback 20. Drive device 40 and drive adjusting means 50
The armrest 30 is rotatably attached to the armrest 30.

The seat back 20 is a side frame 21.
The armrests 30 are provided on the arm brackets 31 each having an L-shaped cross section. A lock plate 22 is sandwiched between the side frame 21 and the arm bracket 31.
Is fixed, and the boss portion 31a formed on the upright portion of the arm bracket 31 is inserted into the boss hole 22a formed in the central portion of the lock plate 22.

The armrest drive device 40 includes a taumel mechanism 41, which is an example of a planetary gear type angle adjusting mechanism, and an electric motor 42. The taumel mechanism 41 includes the eccentric portion 4.
3a, a drive shaft 43, an outer plate 44 having an outer gear 44a, and an inner plate 45 having an inner gear 45a.

The drive shaft 43 has an eccentric portion 43a formed in the middle thereof, and the concentric portion 43b on the one end side has an E ring 43c in a boss hole 31b of a boss portion 31a of the arm bracket 31.
Is pivoted through.

The outer plate 44 is disposed adjacent to the lock plate 22 with a lock lever 61, which will be described later, in between, and an outer gear 44a is formed on the side surface by press half blanking.

The inner plate 45 is fixed to the horizontal portion of the arm bracket 31 adjacent to the outer plate 44, and the inner gear 45a meshing with the outer gear 44a is formed on the side surface by press blanking.

An eccentric portion 43a of the drive shaft 43 is inserted through the rotation center of the outer gear 44a, and a concentric portion 43d on the other end side of the drive shaft 43 is inserted through the rotation center of the inner gear 45a. At the end, the drive gear 46 is the E ring 43.
It is attached via e.

The number of teeth of the outer gear 44a and the inner gear 45a differs by at least one tooth, and the inner gear 45a is rotated by the rotation of the drive shaft 43.
It is set to rotate relative to 4a.

The electric motor 42 has a holder bracket 47.
The holder bracket 47 is fixed to the horizontal portion of the arm bracket 31 so as to face the inner plate 45 and to sandwich the drive adjusting means 50. A pinion gear 48 that meshes with the drive gear 46 is attached to the electric motor 42.

The electric motor drive adjusting means 50 comprises an inertial sensor 51 and a switch section 52. The inertial sensor 51 is arranged between the inner plate 45 and the holder bracket 47, and the concentric portion 43d of the drive shaft 43 is inserted into a bearing member 53 such as a collar or a bearing that is press-fitted in the center of rotation thereof. A balance weight 51a is provided below the inertia sensor 51, and the balance weight 51a allows the inertia sensor 5 to operate.
The axis line 1 is always set on the line of action of gravity.

The switch section 52 includes a contact point 54 mounted on the upper part of the inertial sensor 51 and two contact points 56 mounted on the switch plate 55 so as to face the contact point 54.
57, each of the contacts 54, 56, 57 is connected to the electric motor 42 via a connector 58. Further, as shown in FIG. 5, the contacts 56 and 57 are arranged at positions separated from the position of the contacts 54 by a predetermined angle, for example, 15 °. An angle sensor may be used as another embodiment of the drive adjusting means 50.

When the armrest 30 is unnecessary, the storage mechanism 6 including the lock lever 61 and the storage lever 62.
It is stored by 0.

The lock lever 61 is formed in the shape of a bell crank, its base is pivotally supported on the outer plate 44 by a pivot 63, and is biased to rotate clockwise by a torsion coil spring 64 wound around the base. There is. In addition, a lock portion 61a protruding from one arm of the lock lever 61
Is a torsion coil spring 6 when the armrest 30 is used.
The spring force of No. 4 causes the lock groove 22b formed on the outer periphery of the lock plate 22 to be pressed into engagement.

The storage lever 62 has an intermediate portion pivotally supported on the tip of the arm bracket 31 by a pivot shaft 65, and a grip portion 62a is formed on one end side. Further, between the locking hole 62b formed at the other end of the storage lever 62 and the locking hole 61b formed at the other arm of the lock lever 61, hook portions 66a formed at both ends of the wire 66 are provided. ，
66b are locked.

When the holding portion 62a of the storage lever 62 is pressed to rotate the storage lever 62 counterclockwise as shown by the phantom line in FIG. 6, the lock lever 61 twists the coil spring through the wire 66. By rotating counterclockwise against the spring force of 64, the lock portion 61a is disengaged from the lock groove 22b of the lock plate 22, and the arm bracket 31 can be rotated clockwise.
This allows the armrest 30 to be stored.

Next, the operation of the embodiment of the present invention will be described.

As shown in FIG. 5, when the contact point 54 of the inertial sensor 51 and the contact points 56 and 57 of the switch plate 55 are not connected, the electric motor 42 is not driven and the arm bracket 31, that is, the arm rest 30 is not mounted on the vehicle body. The horizontal state is maintained with respect to the horizontal direction or the gravity direction.

When the seat back 20 is tilted backward by the seat reclining device from this state, the arm bracket 31 is tilted in the same direction accordingly. Then, the contact 54 of the inertial sensor 51 comes into contact with the contact 56 of the switch plate 55, and the electric motor 42 rotates, for example, rotates forward. This rotational drive force is applied to the pinion gear 48 and the drive gear 4
6 to rotate the drive shaft 43 counterclockwise. The inner gear 45a meshes with the outer gear 44a by the rotation of the eccentric portion 43a of the drive shaft 43, and the meshing position of the inner gear 45a is sequentially changed to rotate the arm bracket 31 in the horizontal direction. Then, when the arm bracket 31 returns to the horizontal state, both contacts 54 and 56 are brought into a non-contact state, and the electric motor 42 stops.

As a result, the arm bracket 31, that is, the arm rest 30, can be held in a horizontal state regardless of the tilting angle of the seat back 20.

Further, from the state shown in FIG.
When 0 is tilted forward by the seat reclining device, the arm bracket 31 also tilts in the same direction.
Then, the contact 54 of the inertial sensor 51 contacts the contact 57, and the electric motor 42 rotates in the reverse direction. This drive force causes the drive shaft 43 to rotate clockwise, and the arm bracket 31 to rotate horizontally according to the procedure described above. Then, when the arm bracket 31 returns to the horizontal state, both contacts 5
4, 57 are brought into a non-contact state, and the electric motor 42 is stopped.

As described above, according to the present invention, the arm bracket 31 is automatically rotated in association with the tilting of the seat back 20, and the arm rest 30 can be always held in a horizontal state. Can easily take a comfortable sitting posture regardless of the tilting angle of the seat back 20. An ultrasonic motor may be used as another embodiment of the driving means.

[0034]

As described above, according to the present invention, since the armrest can always be held in the horizontal state in association with the tilting of the seat back, the seated person can always easily take a comfortable sitting posture. it can.

[Brief description of drawings]

FIG. 1 is a perspective explanatory view of a vehicle seat with an armrest according to the present invention.

FIG. 2 is an exploded perspective view illustrating an armrest drive device and a drive adjusting unit.

FIG. 3 is a perspective view for explaining an essential part of what is shown in FIG.

4 is an explanatory view taken along the line IV-IV in FIG.

FIG. 5 is a front view of a main part of a drive adjusting unit.

FIG. 6 is a front view explanatory diagram of an armrest storage mechanism.

[Explanation of symbols]

 E Seat for Vehicle with Armrest 10 Seat Cushion 20 Seat Back 21 Back Arm 22 Lock Plate 30 Arm Rest 31 Arm Bracket 40 Arm Rest Drive Device 41 Taumel Mechanism (Planetary Gear Type Angle Adjustment Mechanism) 42 Electric Motor (Drive Means) 43 Drive Shaft 44 Outer Plate 44a Outer gear 45 Inner plate 45a Inner gear 46 Drive gear 47 Holder bracket 48 Pinion gear 50 Drive adjusting means 51 Inertial sensor 51a Balance weight 52 Switch part 54 contact point 55 Switch plate 56 Contact point 57 Contact point 60 Storage mechanism 61 Lock lever 62 Storage lever

Claims (1)

[Claims] 1. A seat back configured to be tiltable,
A vehicle seat with an armrest in which an armrest is rotatably provided by a drive force of a drive means, and an armrest drive device for rotationally driving the armrest by a drive force of the drive means is provided on the seat back side. Drive adjustment means is arranged on the armrest side, and the drive adjustment means detects the tilt angle of the seat back to adjust the drive amount and drive direction of the drive means so that the armrest can always maintain a horizontal state. A vehicle seat with an armrest characterized in that