JPS6344580B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a vehicle seat rotation device.

Conventionally, the front seats of passenger cars have generally been able to adjust their longitudinal position with a seat track and the angle of the seat back with a seat recliner, but they cannot be rotated, so improvements have been made to improve the ease of getting in and out of the seat. There is room for
Improving the ease of getting on and off a vehicle is particularly meaningful for elderly people and people with disabilities.

The present invention takes into consideration both the awareness of such problems and the demand for weight reduction of vehicles, and aims to provide a seat rotating device that has a simple structure, does not cause an increase in weight, and has excellent strength. In this method, a rotation center hole is directly bored in the seat frame to which the seat is attached, and an open annular space is formed above by continuous inner and outer cylindrical parts around the periphery of the rotation center hole. Into this annular space, the annular wall of the support lock bracket integrated with the lower bracket on the vehicle floor side is inserted so as to be relatively rotatable, making the seat frame, that is, the seat, freely rotatable, and furthermore, the seat frame is set in the normal position. It is characterized by the provision of a locking mechanism for fixing or releasing.

The invention will now be described with reference to the illustrated embodiments. The device of the present invention includes a lower bracket 10, a seat frame 20, a support lock bracket 30, and a seat frame 20 and support lock bracket 30.
The main component is a lock mechanism 40 provided in between.

The lower bracket 10 has a support hole 11 with a bottom formed by shallow drawing downward at approximately the center thereof, and channel-shaped linear attachment brackets 12 and 13 are welded or otherwise formed in front and behind the support hole 11. They are integrally provided by fixing means. The attachment brackets 12, 13 are fixed at both ends to the upper rails 14a, 15a of the left and right seat tracks 14, 15, respectively, and the upper rails 14a, 15a slide against the lower rails 14b, 15b fixed to the vehicle floor. It is possible to move. Reference numeral 16 in FIG. 1 is an operating lever of a locking mechanism that locks and unlocks both rails.

The seat frame 20 has a cushion seat directly attached thereon, and a reclining device 22 and a swing fulcrum plate 23 for the seat back frame 21 are provided on both rear sides of the seat frame 20 (a first
(Illustrated only in figure). A rotation center hole 24 is bored in the seat frame 20, and an annular space 25 with an open upper part is formed around the rotation center hole 24. This annular space 25 is formed by narrowing the seat frame 20. First, an outer cylindrical part 26 is connected to the seat frame 20 downward, and then the tip of this cylindrical part is folded upward inward to form an inner cylinder. A shaped portion 27 is provided, and both continuous cylindrical portions 26,
27 provides an annular space 25 with an open upper part. The cylindrical portion 26 has a diameter that allows it to be rotatably inserted into the support hole 11 of the lower bracket 10.

The support lock bracket 30 is made of a relatively flat bottomed cylindrical body formed by drawing, and has an annular wall 31 that is inserted into the annular space 25 from above so as to be relatively rotatable, and an annular wall 31 that is relatively rotatably inserted into the annular space 25 from above. An inner wall 32 is formed continuously inside the wall 31. The inner cylindrical portion 27 of the seat frame 20 is located in the annular space 33 between the annular wall 31 and the inner wall 32, and the seat frame 20 and the support lock bracket 30 are in an engaged state.
In this state, the bottom wall 34 is fixed to the bottom wall 17 of the support hole 11 of the lower bracket 10 by welding or other fixing means, so that the seat frame 20 can freely rotate with respect to the lower bracket 10. annular wall 3
1 has its lower end facing the bottom of the annular space 25 in order to prevent the seat frame 20 from lifting up. In addition, seat frame 20 and lower bracket 1
In addition to applying grease or other lubricant to the rotating and sliding parts between the seat frame 20 and the support lock bracket 30 to reduce rotational resistance, A large number of balls 35 may be inserted between the support hole bottom wall 17 of the lower bracket 10 and the support hole bottom wall 17 of the lower bracket 10.

Next, the lock mechanism 40 will be explained. A pair of lock holes 41 and 42 are formed in the outer and inner cylindrical portions 26 and 27 of the seat frame 20 at the same radial position, respectively, and also in the annular wall 31 of the support lock bracket 30. A pair of lock holes 43 are drilled which are located on the axis of the lock holes 41 and 42 when the seat frame 20 is rotated to the normal position. On the other hand, on the outside of the outer cylindrical portion 27 of the seat frame 20, a locking member 44 having a pair of locking claws 44a that can enter between each pair of locking holes 41, 43, 42 is arranged along the guide hole 45a of the support bracket 45. It is provided so that it can be slid. This locking member 44 is always locked by a compression spring 46 inserted between the inner wall of a support bracket 45 fixed to the outer wall of the outer cylindrical portion 26 and a spring hanging pin 44b protruding from the locking member 44. The claw 44a is the lock hole 41, 4
2,43. 4
Reference numeral 7 designates an operating handle for retracting the locking member 44 against this biasing force, which is rotatably supported on the lower surface of the seat frame 20 by a support plate 48, and a right-angled bent portion 47a at the inner end of the operating handle 7 is used to move the locking member 44 backward against this biasing force. It is inserted into the engagement hole 44c at the outer end. 47
Reference numeral b designates an operating portion formed at the end opposite to the right-angled bent portion 47a and bent at a right angle with a phase difference of approximately 90° from the bent portion.

Therefore, in the present device having the above configuration, when the seat frame 20, that is, the seat is facing the normal position (front position), the lock pawl 44a of the lock member 44 is locked into the lock holes 41, 43 by the biasing force of the compression spring 46. , 42, the seat frame 20 is in contact with the support lock bracket 3.
0, that is, it cannot rotate with respect to the vehicle floor side. This is the normal state in which the lock mechanism 40 restrains the rotation of the seat.

To rotate the seat when getting on and off, lift the operating portion 47b of the operating handle 47 upwards and rotate the handle 47 to rotate the right angle bending portion 47.
The locking member 44 is moved backward through the locking holes 42 and 44c, and the locking pawl 44a is inserted into the locking holes 42 and 44c.
All you have to do is separate it from 3. Since the seat frame 20 can then rotate freely, the seat can be rotated toward the door and passengers can easily get in and out of the vehicle. It is preferable to restrict the rotatable range of the seat using an appropriate stopper depending on the left seat or right seat. Of course, if a locking hole corresponding to the door-side rotating position of the seat is separately formed in the annular wall 31 of the support lock bracket 30, the seat can be locked there. When the seat is returned to its normal position after getting on and off, the force of the compression spring 46 causes the lock pawl 44a to lock into the lock holes 41, 43,
42, the seat is locked in its normal position.

In the embodiment described above, front and rear attachment brackets 12 and 13 are used to secure the lower bracket 10 on the seat tracks 14 and 15.
According to this configuration, a versatile device can be obtained that can deal with different seat rotational positions depending on the vehicle type and indoor rotational conditions, and it is also possible to further reduce the weight by making the lower bracket 10 as small as possible. . It is preferable that the lower bracket 10 and the attachment brackets 12 and 13 be provided with beads or flanges as appropriate to increase their rigidity.

Further, the lock mechanism 40 in the above embodiment includes the inner and outer cylindrical portions 27 and 26 of the seat frame 20,
This is provided between the support lock bracket 30 and the annular wall 31, so that a locking mechanism with a simple structure can be obtained, and by changing the positions of the locking holes 41, 42, and 43, the direction of the operating handle 47 can be changed freely. However, it is also possible to provide a locking mechanism with the same function between the seat frame 20 and the lower bracket 10.

In summary, the present invention provides a support lock having a rotation center hole formed directly in the seat frame to which the seat is attached, an open annular space above the periphery of the rotation center hole, and an annular wall inserted into the annular space so as to be relatively rotatable. The basic rotation mechanism consists of the bracket and the lower bracket on the vehicle floor side that fixes this support lock bracket.
It is possible to obtain a seat rotation device that has a simple structure and requires only a slight increase in weight compared to a seat without a rotation mechanism. It is possible to provide a seat that can improve the ease of getting on and off the vehicle without going against the demand for weight reduction.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing an embodiment of the seat rotation device according to the present invention, FIG. 2 is a plan view of the assembled state, and FIGS. 3 and 4 are the same as in FIG.
FIG. 5 is a sectional view taken along the line ``-'' and FIG. 5 is a sectional view similar to FIG. 4 showing another embodiment of the seat frame rotation support mechanism. 10... Lower bracket, 11... Support hole, 1
2, 13... Attachment bracket, 14,
15... Seat track, 20... Seat frame, 24... Rotation center hole, 25... Annular space, 2
6... Outer cylindrical part, 27... Inner cylindrical part, 30...
... Support lock bracket, 31 ... Annular wall,
40... Lock mechanism, 41, 42, 43... Lock hole, 44... Lock member, 44a... Lock pawl, 46... Compression spring, 47... Operation handle.

Claims (1)

[Scope of Claims] 1. A lower bracket fixed to the vehicle floor side, a seat frame to which the seat is attached, a rotation center hole bored in the seat frame, and an inner and outer cylindrical shape continuous to the periphery of the rotation center hole. an annular wall that is relatively rotatably inserted into the annular space from above, and is fixed to the lower bracket; and a support lock bracket that holds the seat frame in its normal position. A seat rotation device consisting of a lock mechanism that is fixed to or can be rotated freely. 2. The seat rotation device according to claim 1, wherein the lower bracket is fixed on a seat track that adjusts the longitudinal position of the seat via front and rear attachment brackets. 3. In claim 1 or 2, the lock mechanism includes lock holes formed in the cylindrical portion of the seat frame and the annular wall of the support lock bracket, respectively, and a lock member that moves back and forth between the two lock holes. A seat rotation device consisting of.