JP2011131840A - Vehicle seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enlarge an attaching space of a spring for reclining and returning a backrest. <P>SOLUTION: The spring 40 for energizing the backrest seat 3 to rotate in a front direction when a reclining mechanism 4 becomes an unlocking state is provided between a seat 2 and a backrest seat 3. The spring 40 includes a spiral part 41 which spirals one or more turns at its center and a backrest side engaging part 43 at an end of the spiral part 41 engages with a backrest side engaging body 42 of a backrest side bracket 10 and a seat side engaging part 48 of another end of the spiral part 41 engages with a seat side engaging body 47. In the vehicle seat, the reclining mechanism 4 is arranged between a longitudinal plate 44 of the backrest side bracket 10 and a longitudinal plate 49 of the seat side bracket 11 and, as for the spiral part 41 of the spring 40, its shaft center direction is arranged to be substantially in parallel with the shaft center direction of a rotation central axis 12, and the spiral part 41 of the spring 40 and the reclining mechanism 4 partially overlap with each other in the shaft center direction of the spiral part 41. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vehicle seat.

  Conventionally, the reclining mechanism that adjusts the inclination angle of the dorsal seat is such that the seat side bracket is located outside the dorsal side bracket, and the reclining mechanism is provided between the dorsal side bracket and the seat side bracket, and the outside of the seat side bracket. In addition, when the reclining mechanism is unlocked, a spring is provided to urge the seat back so as to rotate forward. Such a vehicle seat is known (Patent Document 1).

JP 2008-44559 A

The known example requires that the engaging gear of the reclining mechanism is attached to one of the backside bracket and the seat side bracket, and the locking member of the reclining mechanism is attached to the other of the backside bracket and the seat side bracket. The reclining mechanism is placed between the seat side bracket and the seat side bracket, but there is no space to provide a spring for rotating the back seat attached to both the back side bracket and the seat side bracket. It was provided.
Therefore, in the known example, there is a problem that the spring is positioned on the outer surface side of the seat-side bracket, and interference such as contact with other structural members such as the skin may occur, resulting in unstable operation.
Moreover, since the spring is provided on the outer surface side of the seat side bracket, there is a problem that the right and left width of the installation space in which the reclining mechanism is provided is increased.
Therefore, the present application devises the attachment of the spring, avoids interference between the spring and other members, and reduces the lateral width of the attachment portion of the reclining mechanism.

In the present invention, a backrest seat 3 is attached to a seat seat 2 via a reclining mechanism 4 so as to be rotatable about a rotation center axis 12 and adjustable in inclination angle, and the reclining mechanism 4 is engaged with and disengaged from an engagement gear 22. A lock member 24 is provided, and between the seat seat 2 and the dorsal seat 3, when the reclining mechanism 4 is unlocked, the back seat 3 is urged to rotate forward. A spring 40 is provided, and the spring 40 is formed to have a spiral portion 41 that spirals one or more turns in the center, and the dorsal side engaging portion 43 at one end of the spiral portion 41 is a dorsal side bracket of the dorsal seat 3. 10, the seat-side engagement portion 48 at the other end of the spiral portion 41 is engaged with the seat-side engagement body 47 of the seat-side bracket 11, and the reclining mechanism 4 is , The dorsal bracket 10 The spiral portion 41 of the spring 40 is provided between the plate portion 44 and the vertical plate portion 49 of the seat side bracket 11 so that the axial direction of the spring 40 is substantially parallel to the axial direction of the rotation center shaft 12. The spiral part 41 and the reclining mechanism 4 are vehicle seats configured to partially overlap each other in the axial direction of the spiral part 41.
In the present invention, the width in the axial direction of the spiral portion 41 of the spring 40 and the thickness in the axial direction of the spiral portion 41 of the reclining mechanism 4 are the thickness of the reclining mechanism 4 based on the width of the spiral portion 41. The vehicle seat is made thicker.
In the present invention, the dorsal side locking body 42 is formed by the mounting portion 45 attached to the outer surface of the vertical plate portion 44 of the dorsal side bracket 10 and the locking portion 46 engaged with the dorsal side engaging portion 43. The seat-side locking body 47 is formed in a mold shape, and the front-side view is inverted by the mounting portion 50 that is attached to the inner surface of the vertical plate portion 49 of the seat-side bracket 11 and the locking portion 51 that the seat-side engaging portion 48 engages. The locking portion 46 of the dorsal side locking body 42 protrudes outward, the locking portion 51 of the seat side locking body 47 protrudes inward, and the locking portion 46 and the engagement portion 46 are formed in an L shape. The stopping portion 51 is a vehicle seat configured to confront the reclining mechanism 4.
In the present invention, the dorsal side engaging portion 43 of the spring 40 is formed on the outer periphery of the upper portion of the spiral portion 41, and the seat side engaging portion 48 of the spring 40 is sandwiched between the axis of the rotation center shaft 12. The vehicular seat is formed on the inner periphery of the lower part of the spiral portion 41 substantially opposite to the heel side engaging portion 43.
In the present invention, the dorsal side locking body 42 is formed by an attachment portion 45 that is attached to the outer surface of the vertical plate portion 44 of the dorsal side bracket 10 and a locking portion 46 that engages the dorsal side engaging portion 43. The seat-side locking body 47 is formed by a mounting portion 50 that is attached to the inner surface of the vertical plate portion 49 of the seat-side bracket 11 and a locking portion 51 that engages with the seat-side engaging portion 48, and The locking body 42 is fixed to the vertical plate portion 44 of the dorsal bracket 10 with the mounting portion 45 positioned above the locking portion 46, and the seat side locking body 47 is fixed to the locking portion 51. The vehicle seat is fixed to the vertical plate portion 49 of the seat side bracket 11 with the mounting portion 50 positioned on the lower side.
According to the present invention, the reclining mechanism 4 includes a vehicle seat configured by providing a lock member 24 that engages and disengages with the engagement gear 22 in a case in which the engagement gear 22 is formed on an inner circumferential surface of a regular circle. It is a thing.

In the invention of claim 1, the reclining mechanism 4 is provided between the dorsal bracket 10 and the seat bracket 11, and the spiral portion 41 of the spring 40 and the reclining mechanism 4 partially overlap each other. The left and right widths of the mounting portion of the mechanism 4 and the spring 40 can be reduced, and the spring 40 can be positioned on the inner surface side of the seat side bracket 11 to avoid interference such as contact with other components such as the skin. Therefore, the certainty of operation can be improved.
In the invention of claim 2, since the thickness of the reclining mechanism 4 is made larger than the width of the spiral portion 41, the periphery of the spiral portion 41 is in contact with the outer surface of the dorsal bracket 10 and the inner surface of the seat bracket 11. However, it is possible to ensure the reliability of the operation while the spring 40 is positioned on the inner surface side of the seat side bracket 11.
In the invention of claim 3, the reclining mechanism 4 and the spring 40 can be disposed between the locking portion 46 of the dorsal-side locking body 42 and the locking portion 51 of the seat-side locking body 47, and the spring 40 is placed on the seat side. It can be located on the inner surface side of the bracket 11, and the left and right width of the mounting portion of the reclining mechanism 4 can be reduced.
In the invention of claim 4, since the dorsal-side engaging portion 43 and the seat-side engaging portion 48 of the spring 40 are arranged vertically, the engaging portion 46 and the engaging portion 51 overlap each other in the left-right direction. Therefore, the mounting space for the reclining mechanism 4 is reduced.
In the invention of claim 5, the dorsal side locking body 42 can be positioned above the spiral portion 41 of the spring 40, and the seat side locking body 47 can be positioned below the spiral portion 41. The portion 45 and the attachment portion 50 do not overlap with the spiral portion 41 of the spring 40, and the attachment space of the reclining mechanism 4 in the axial direction of the rotation center shaft 12 is reduced.
In the invention of claim 6, the portion where the spiral portion 41 of the spring 40 and the reclining mechanism 4 overlap each other can be increased, and the left and right widths of the attachment portions of the reclining mechanism 4 and the spring 40 can be further reduced.

The schematic side view of a vehicle seat. The attachment outline state perspective view of a reclining mechanism. The disassembled perspective view of a reclining mechanism. The unlocked side view. The unlocked side view. The schematic side view of a reclining mechanism attachment part. FIG. Sectional drawing of another Example.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a vehicle seat. (For the sake of easy understanding, description will be made by showing directions such as front and rear, right and left, inside / outside, front and back, etc., but the configuration is not limited thereby). 5 is a slide rail.
A back bracket 10 is provided on the back seat 3, and a seat side bracket 11 provided on the seat seat 2 side is rotatably attached to the back bracket 10 by a rotation center shaft 12. Reference numeral 13 denotes a through hole in the dorsal side bracket 10 through which the rotation center shaft 12 is inserted, and reference numeral 14 denotes a through hole in the seat side bracket 11 through which the rotation center shaft 12 is inserted.
The reclining mechanism 4 is provided between the dorsal bracket 10 and the seat bracket 11. The configuration of the reclining mechanism 4 is arbitrary, and as an example, an engagement gear 22 is formed on the inner peripheral surface of the one-side case 20, and a lock gear that engages and disengages from the engagement gear 22 in the one-side case 20. A sliding lock member 24 having a portion 23 is provided.

The locking member 24 slides in the sliding groove 26 of the other case 25 and moves far and away with respect to the engagement gear 22, and the lock member 24 is engaged with the engagement gear 22 and unlocked from the engagement gear 22. Switch to state.
The other case 25 is formed with bulging portions 27 that bulge inward. The sliding groove 26 is formed between the bulging portion 27 and the bulging portion 27 facing the front and rear (left and right in FIG. 4).
A pair of upper and lower lock members 24 are provided, and a cam surface 28 is formed on the rotation center shaft 12 side of each lock member 24. Both ends of the cam body 29 are brought into contact with the cam surface 28 of each lock member 24. The cam body 29 is fixedly attached to the rotation center shaft 12.
That is, the reclining mechanism 4 holds the lock member 24 between the one side case 20 and the other side case 25 and the other side guide member 30, and engages the inner peripheral surface of either the one side case 20 or the other side case 25. What is necessary is just to set it as the structure which engages / releases with the gear 22. FIG.

When the rotation center shaft 12 is rotated by the reclining operation lever 31, the reclining mechanism 4 causes the rotation center shaft 12 to rotate the cam body 29, and the cam body 29 comes into contact with the cam surface 28 of the lock member 24 to lock. The member 24 slides in the sliding groove 26 between the bulging portions 27 and 27 in a direction away from the engagement gear 22 to unlock the reclining mechanism 4, adjust the inclination angle of the dorsal seat 3, and recline When the operating lever 31 is released, the cam body 29 is rotated in the locking direction by the spring 21, the locking member 24 slides in the sliding groove 26, and the locking gear portion 23 of the locking member 24 is locked to the engaging gear 22. Engage and lock the reclining mechanism 4.
The configuration in which the cam body 29 is rotated by operating the reclining operation lever 31 is arbitrary. In this embodiment, the cam body 29 is fixedly attached to the rotation center shaft 12 and rotated by the reclining operation lever 31. Although the central shaft 12 is directly rotated, the rotational central shaft 12, the cam body 29, and the reclining operation lever 31 may be connected by an operation transmission means such as a link, and is not limited to the configuration of the present application.

In this case, for example, as in the embodiment, a so-called serration groove 12A is formed on the rotation center shaft 12, and is configured to rotate integrally with the fitting member 12B fitted to the cam body 29. 12, the reclining operation lever 31 and the cam body 29 are fixedly mounted, and the cam body 29 is rotated by the operation of the reclining operation lever 31.
Further, the reclining operation lever 31 of this embodiment is provided with a locking portion 33 of a wire 32, and although the wire 32 is not shown, it is connected to a locking device of the slide mechanism to release the locking device of the slide mechanism. Thus, the entire seat is advanced, and it is configured to correspond to a so-called walk-in mechanism that forms a boarding / exiting space in which a person can get on and off with the vehicle seat 1 behind the advanced seat.

Thus, a spring 40 is provided between the dorsal bracket 10 and the seat bracket 11 to cause the dorsal seat 3 to fall forward when the reclining mechanism 4 is unlocked. The spring 40 is configured by a so-called spiral spring formed with a spiral portion 41 that spirals one or more turns in the center.
At one end of the spiral portion 41, a dorsal side engaging portion 43 that is engaged with the dorsal side engaging member 42 of the dorsal side bracket 10 is provided. The dorsal side engaging portion 43 is formed to protrude outward (radial direction) from the outer periphery of the spiral portion 41.
The dorsal side locking body 42 is formed into an L shape when viewed from the front by an attachment portion 45 attached to the outer surface of the vertical plate portion 44 of the dorsal side bracket 10 and a locking portion 46 engaged with the dorsal side locking body 42. Form.

That is, the dorsal side engaging portion 43 is formed on the upper portion of the spiral portion 41 and is engaged with the engaging portion 46 of the dorsal side engaging body 42 provided above the through hole 13 of the dorsal side bracket 10. .
The other end of the spiral portion 41 is provided with a seat side engaging portion 48 that is locked to the seat side locking body 47 of the seat side bracket 11. The seat side engaging portion 48 is formed so as to protrude inward (radial direction) from the inner periphery of the spiral portion 41.
The seat side engaging portion 48 is formed on the inner periphery of the lower portion of the spiral portion 41 that is substantially opposite to the dorsal side engaging portion 43 across the axis of the rotation center shaft 12.
The seat side latching body 47 is formed in an L-shape inverted in front view by a mounting part 50 attached to the inner surface of the vertical plate part 49 of the seat side bracket 11 and a latching part 51 engaged with the seat side engaging part 48. .

Thus, the reclining mechanism 4 is disposed between the vertical plate portion 44 of the dorsal bracket 10 and the vertical plate portion 49 of the seat side bracket 11, and is located inside the inner peripheral surface of the spiral portion 41 of the spring 40. Thus, the reclining mechanism 4 and the spiral portion 41 of the spring 40 partially overlap each other in the axial direction of the spiral portion 41.
That is, the reclining mechanism 4 is inserted into the inner peripheral surface of the spiral portion 41 of the spring 40 so that the spiral portion 41 of the spring 40 is positioned radially outward from the outer periphery of the reclining mechanism 4. The mechanism 4 and the spring 40 are configured to partially overlap each other in the axial direction of the spiral portion 41.
Therefore, the left and right widths of the spring 40 and the reclining mechanism 4 are reduced by the width of the spiral portion 41 of the spring 40 and the mounting space of the spiral portion 41.

In this case, the width in the axial direction of the spiral portion 41 of the spring 40 and the thickness in the axial direction of the spiral portion 41 of the reclining mechanism 4 are such that the thickness of the reclining mechanism 4 is larger than the width of the spiral portion 41. It is possible to prevent the peripheral edge of the portion 41 from contacting the outer surface of the dorsal bracket 10 and the inner surface of the seat bracket 11.
It should be noted that the spiral portion 41 of the spring 40 has an inner diameter that is reduced when the dorsal seat 3 is tilted backward, and is tightened. Therefore, even if the dorsal seat 3 is tilted rearward, A predetermined gap is provided between the inner peripheral surface of the spiral portion 41 of the spring 40 and the outer periphery of the reclining mechanism 4 so that the peripheral surface does not contact the outer periphery of the reclining mechanism 4.

In addition, the locking portion 46 of the dorsal side locking body 42 protrudes outward, and the locking portion 51 of the seat side locking body 47 protrudes inward, and is opposed to the reclining mechanism 4 and the spring 40.
Further, the dorsal-side locking body 42 is fixed to the vertical plate portion 44 of the dorsal-side bracket 10 with the mounting portion 45 positioned above the locking portion 46.
Further, the seat side locking body 47 is fixed to the vertical plate portion 49 of the seat side bracket 11 with the mounting portion 50 positioned below the locking portion 51.
Further, the vertical plate portion 44 of the dorsal bracket 10 and the vertical plate portion 49 of the seat side bracket 11 are positioned substantially parallel to each other, and the spiral portion 41 of the spring 40 intersects the vertical plate portion 49 and the vertical plate portion 44. To place.

Further, the locking portion 46 of the dorsal side locking body 42 of the dorsal bracket 10 is positioned above the upper edge 53 of the vertical plate portion 49 of the seat side bracket 11.
Further, the locking portion 51 of the seat side locking body 47 of the seat side bracket 11 is positioned below the lower edge 54 of the vertical plate portion 49 of the dorsal side bracket 10.
FIG. 8 shows another embodiment, in which the reclining mechanism 4 includes a sector gear 56 having an engagement gear 55 formed on the outer periphery, and a lock gear 57 on the engagement gear 55. The spiral portion 41 of the spring 40 is configured to partially overlap each other in the axial direction of the spiral portion 41.
In this case, the reclining operation lever 31 is attached to the attachment shaft 58 of the lock gear 57.

(Operation of Example)
When the reclining operation lever 31 is operated, the rotation center shaft 12 rotates the cam body 29, the cam body 29 contacts the cam surface 28 of the lock member 24, and the lock member 24 is located between the bulging portions 27 and 27. When the reclining mechanism 4 is unlocked by sliding in the sliding groove 26 in the direction away from the engaging gear 22, the inclination angle of the dorsal seat 3 is adjusted, and the reclining operation lever 31 is released, the cam is moved by the spring 21. The body 29 is rotated in the lock direction, the lock member 24 slides in the slide groove 26, and the lock gear portion 23 of the lock member 24 is engaged with the engagement gear 22 to lock the reclining mechanism 4.

  The reclining mechanism 4 holds the locking member 24 between the one side case 20 and the other side case 25, and this reclining mechanism 4 is provided between the dorsal side bracket 10 and the seat side bracket 11 to unlock the reclining mechanism 4. In this case, the spring 40 and the reclining mechanism 4 that cause the dorsal seat 3 to tilt forward are configured to partially overlap each other in the axial direction of the spiral portion 41, so that the width of the spiral portion 41 of the spring 40 and the attachment of the spiral portion 41 are configured. The left and right widths of the spring 40 and the reclining mechanism 4 are reduced by the amount of space.

Moreover, since the reclining mechanism 4 and the spring 40 are located between the vertical plate part 44 of the dorsal-side bracket 10 and the vertical plate part 49 of the seat-side bracket 11, the reclining mechanism 4 and the spring 40 are separated from other components such as the skin. Interference such as contact can be avoided and the reliability of operation is improved.
The spring 40 is formed to have a spiral part 41 that spirals one or more turns at the center, and the dorsal side engagement that is locked to the dorsal side locking body 42 of the dorsal side bracket 10 at one end of the spiral part 41. Since the portion 43 is provided, the dorsal side engaging portion 43 is locked to the dorsal side locking body 42.
Since the dorsal side engaging portion 43 of the spring 40 protrudes outward (radial direction) from the outer periphery of the spiral portion 41 and is positioned at the upper portion in the normal seating state, the vertical plate portion 44 of the dorsal side bracket 10. It can be easily engaged with the dorsal-side locking body 42 provided on the outer surface.

Since the seat-side engaging portion 48 that is locked to the seat-side locking body 47 of the seat-side bracket 11 is provided at the other end of the spiral portion 41, the seat-side engaging portion 48 is attached to the seat-side locking body 47. Lock.
Since the seat side engaging portion 48 of the spring 40 is formed so as to protrude to the inner side (radial direction) above the inner periphery of the spiral portion 41 in FIG. 6, the seat side engaging portion 48 is formed on the inner surface of the vertical plate portion 49 of the seat side bracket 11. The seat side engaging portion 48 is engaged with the provided seat side locking body 47.
Therefore, the seat side engaging portion 48 provided on the inner periphery of the spiral portion 41 can be locked to the seat side locking body 47 of the seat side bracket 11.

In this case, since the seat side engaging portion 48 is formed on the inner periphery of the lower portion of the spiral portion 41 that is substantially opposite to the dorsal side engaging portion 43 with the axis of the rotation center shaft 12 interposed therebetween, The body 47 is provided on the vertical plate portion 49 below the through hole 14 of the seat side bracket 11.
The dorsal side locking body 42 is formed in an L shape when viewed from the front by an attachment portion 45 attached to the outer surface of the vertical plate portion 44 of the dorsal side bracket 10 and a locking portion 46 engaged with the dorsal side engaging portion 43. Therefore, the locking portion 46 of the dorsal side locking body 42 and the dorsal side engaging portion 43 of the spring 40 are partially overlapped with each other in the axial direction of the rotation center shaft 12 in a front view.

That is, the dorsal side engaging portion 43 is formed above the upper surface of the spiral portion 41 and the dorsal side locking body 42 is provided above the through hole 13 of the dorsal side bracket 10. The locking portion 46 of the locking body 42 and the dorsal side engaging portion 43 of the spring 40 are partially overlapped with each other in the axial direction of the rotation center shaft 12 in a front view.
The seat side latching body 47 is formed in an L-shape inverted in front view by a mounting part 50 attached to the inner surface of the vertical plate part 49 of the seat side bracket 11 and a latching part 51 engaged with the seat side engaging part 48. Therefore, the locking portion 51 of the seat-side locking body 47 and the seat-side engaging portion 48 of the spring 40 are partially overlapped with each other in the axial direction of the rotation center shaft 12 in a front view.

Therefore, the back bracket 10, the seat bracket 11, and the spring 40 reduce the width of the rotation center shaft 12 in the axial direction.
Further, the reclining mechanism 4 is positioned between the vertical plate portion 44 of the dorsal bracket 10 and the vertical plate portion 49 of the seat side bracket 11, and is positioned further inside than the inner peripheral surface of the spiral portion 41 of the spring 40. Since the reclining mechanism 4 and the spring 40 are partially overlapped in front view in the axial direction of the rotation center shaft 12, the backside bracket 10, the seat side bracket 11, the reclining mechanism 4, and the spring 40 Decreases the width of the rotation center shaft 12 in the axial direction, and reduces the space for mounting the reclining mechanism 4 and the spring 40.

In this case, the width of the spiral portion 41 of the spring 40 and the thickness of the reclining mechanism 4 are as follows. When the thickness of the reclining mechanism 4 is made larger than the width of the spiral portion 41, the peripheral edge of the spiral portion 41 is separated from the outer surface of the back bracket 10. It does not contact the inner surface of the seat side bracket 11 and is suitable.
Further, the locking portion 46 of the dorsal side locking body 42 protrudes outward, and the locking portion 51 of the seat side locking body 47 protrudes inward, so that they face each other with the reclining mechanism 4 and the spring 40 interposed therebetween. In the front view, a part of the locking part 46 and the locking part 51 are overlapped with each other in the axial direction of the rotation center shaft 12 to reduce the mounting space for the reclining mechanism 4 and the spring 40.

Further, since the dorsal side locking body 42 is fixed to the vertical plate portion 44 of the dorsal side bracket 10 with the mounting portion 45 positioned above the locking portion 46, the mounting portion 45 is fixed to the spring 40. The space for mounting the reclining mechanism 4 and the spring 40 in the axial direction of the rotation center shaft 12 is reduced without overlapping the spiral portion 41.
Further, since the seat side locking body 47 is fixed to the vertical plate portion 49 of the seat side bracket 11 with the mounting portion 50 positioned below the locking portion 51, the mounting portion 50 is a spiral of the spring 40. The mounting space for the reclining mechanism 4 and the spring 40 in the axial direction of the rotation center shaft 12 is reduced without overlapping the portion 41.

Further, the vertical plate portion 44 of the dorsal bracket 10 and the vertical plate portion 49 of the seat side bracket 11 are positioned substantially parallel to each other, and the spiral portion 41 of the spring 40 intersects the vertical plate portion 49 and the vertical plate portion 44. Therefore, a part of the spiral portion 41 of the spring 40 and the reclining mechanism 4 are overlapped with each other in the axial direction of the rotation center shaft 12 in a front view, and the reclining in the axial direction of the rotation center shaft 12 is performed. The mounting space for the mechanism 4 and the spring 40 is reduced.
Further, since the locking portion 46 of the dorsal side locking body 42 of the dorsal side bracket 10 is positioned above the upper edge 53 of the vertical plate portion 49 of the seat side bracket 11, The mounting space for the reclining mechanism 4 and the spring 40 in the central direction is reduced.

Further, since the locking portion 51 of the seat side locking body 47 of the seat side bracket 11 is positioned below the lower edge 54 of the vertical plate portion 49 of the dorsal side bracket 10, the axial center of the rotation center shaft 12. The mounting space for the direction reclining mechanism 4 and the spring 40 is reduced.
Further, in another embodiment of FIG. 8, when the reclining operation lever 31 is operated, the attachment shaft 58 rotates, the lock gear 57 is rotated about the attachment shaft 58, and is disengaged from the engagement gear 55 of the sector gear 56. When the reclining operation lever 31 is released, the lock gear 57 is returned by a spring (not shown) and engaged with the engagement gear 55 of the sector gear 56 to be locked.
In this case, since the sector gear 56 and the spiral portion 41 of the spring 40 are configured to partially overlap each other in the axial direction of the spiral portion 41, the mounting space for the reclining mechanism 4 and the spring 40 in the axial direction of the spiral portion 41 is reduced. Make it smaller.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle seat, 2 ... Seat seat, 3 ... Back seat seat, 4 ... Reclining mechanism, 5 ... Slide rail, 10 ... Back side bracket, 11 ... Seat side bracket, 12 ... Turning center axis, 13 ... Transparent Hole: 14 ... Through hole, 20 ... One side case, 22 ... engagement gear, 23 ... lock gear part, 24 ... lock member, 25 ... other side case, 26 ... sliding groove, 27 ... bulge part, 28 ... cam Surface, 29 ... cam body, 31 ... reclining operation lever, 32 ... wire, 33 ... locking part, 40 ... spring, 41 ... spiral part, 42 ... dorsal side locking body, 43 ... dorsal side engaging part 44 ... Vertical plate portion, 45 ... Mounting portion, 46 ... Locking portion, 47 ... Seat side locking body, 48 ... Seat side engaging portion, 49 ... Vertical plate portion, 50 ... Mounting portion, 51 ... Locking portion 53 ... Upper edge, 54 ... Lower edge, 55 ... Engagement gear, 56 ... Sector gear, 57 ... Lock gear, 8 ... the mounting shaft.

Claims (6)

A backrest seat 3 is attached to the seat seat 2 via a reclining mechanism 4 so as to be rotatable about the rotation center shaft 12 and to be adjustable in inclination angle. The reclining mechanism 4 has a lock member 24 that is engaged with and disengaged from the engagement gear 22. And a spring 40 is provided between the seat seat 2 and the dorsal seat 3 to bias the dorsal seat 3 forward when the reclining mechanism 4 is unlocked. The spring 40 is formed to have a spiral part 41 that spirals one or more times in the center, and the dorsal side engaging part 43 at one end of the spiral part 41 is the dorsal part of the dorsal side bracket 10 of the dorsal seat 3. The side locking body 42 is locked, the seat side engagement portion 48 at the other end of the spiral portion 41 is locked to the seat side locking body 47 of the seat side bracket 11, and the reclining mechanism 4 is Vertical plate portion 44 of the side bracket 10 The spiral portion 41 of the spring 40 is provided between the vertical plate portion 49 of the seat side bracket 11 and the axial direction of the spiral portion 41 of the spring 40 is substantially parallel to the axial direction of the rotation center shaft 12. The reclining mechanism 4 is a vehicle seat configured to partially overlap each other in the axial direction of the spiral portion 41. The width of the spiral portion 41 of the spring 40 in the axial direction and the thickness of the spiral portion 41 of the reclining mechanism 4 in the axial direction according to claim 1 are: Thickened vehicle seat. 3. The dorsal side locking body 42 according to claim 1 or 2, wherein the dorsal side locking body 42 is engaged with the attachment portion 45 attached to the outer surface of the vertical plate portion 44 of the dorsal side bracket 10 and the dorsal side engaging portion 43. The seat side latching body 47 is formed in an L shape by a stop portion 46, and the seat side latching body 47 is a latching portion in which the mounting portion 50 attached to the inner surface of the vertical plate portion 49 of the seat side bracket 11 and the seat side engaging portion 48 are engaged. 51 is formed in an inverted L shape when viewed from the front, the locking portion 46 of the dorsal side locking body 42 protrudes outward, the locking portion 51 of the seat side locking body 47 protrudes inward, and the locking The vehicle seat configured such that the portion 46 and the locking portion 51 face each other with the reclining mechanism 4 interposed therebetween. 4. The dorsal side engaging portion 43 of the spring 40 is formed on the outer periphery of the upper portion of the spiral portion 41, and the seat side engaging portion 48 of the spring 40 is a rotation center axis. The vehicle seat formed in the lower inner periphery of the spiral part 41 substantially opposed to the dorsal side engaging part 43 across the 12 axis. In Claim 1, 2 or 3 or 4, the dorsal-side locking body 42 includes an attachment portion 45 attached to the outer surface of the vertical plate portion 44 of the dorsal-side bracket 10 and the dorsal-side engagement. The seat side locking body 47 is formed by a locking portion 46 with which the joint portion 43 is engaged, and the mounting portion 50 and the seat side engaging portion 48 that are attached to the inner surface of the vertical plate portion 49 of the seat side bracket 11 are engaged. The dorsal side locking body 42 is fixed to the vertical plate portion 44 of the dorsal bracket 10 with the mounting portion 45 positioned above the locking portion 46, and the seat The side locking body 47 is a vehicle seat that is fixed to the vertical plate portion 49 of the seat side bracket 11 with the mounting portion 50 positioned below the locking portion 51. The reclining mechanism 4 according to claim 1, claim 2, claim 3, claim 4, or claim 5, wherein the reclining mechanism 4 is provided in the case in which the engagement gear 22 is formed on a regular circular inner peripheral surface. A vehicle seat comprising a lock member 24 that engages and disengages.

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