JP2010234970A - Forward falling device of seat back - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide high durability by reducing a load of a part by forward falling operation, by surely performing the forward falling operation of two stages of a seat back, and reducing a load on a component due to forward falling operation, in a vehicular seat having a reclining device capable of adjusting the seat back and a forward falling device for quickly bringing down the seat back forward. <P>SOLUTION: An engaging projection is arranged on an operation lever 3 journaled to a seat cushion side bracket 2 by a fastening member, and forward falling is checked once in an intermediate position when the seat back falls forward by engaging its engaging projection and a step part formed on a seat back side bracket 1, and the forward falling is completely performed by operation of the operation lever 3, and the operation lever 3 escapes in a clearance when the step part and the engaging projection abut on each other, because the clearance is arranged between the fastening member and the operation lever 3, and a load applied from the seat back side is thereby prevented from concentrating on one place. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a seat-back advance device for a vehicle seat.

  In many cases, the vehicle seat is provided with various angle / position adjusting mechanisms so as to be adapted to the body shape and driving posture of each seated passenger. Among them, the reclining device that adjusts the angle of the seat back with respect to the seat cushion is the most basic seat adjustment mechanism and is mounted on most vehicles. In addition to the reclining device that adjusts the angle of the seat back described above, a vehicular seat including a forward tilting mechanism that can quickly tilt the seat back forward is also widely used.

  With regard to the forward moving mechanism that quickly moves the seat back forward, the forward movement of the seat back is performed in two stages by stopping it at an intermediate position once instead of moving the seat back completely forward by a single forward operation. What has been proposed is proposed. In Patent Document 1, the engagement between the first operation lever and the first engagement protrusion and the first operation lever and the first engagement protrusion that prevent the seat back from being moved forward when the seat back is in the normal standing position. There is described a configuration in which a second operation lever and a second engagement protrusion are provided that prevent further forward movement of the seat back when the seat back is moved forward to the intermediate position.

Japanese Utility Model Publication No. 63-12006

  The above-described seat back forward device is configured such that the seat back can be moved forward in two stages, a position where the seat back is completely tilted and an intermediate position, by a combination of an operation lever and an engaging protrusion. When the seat back is prevented from being moved forward, the load on the seat back is concentrated on the engaging protrusion, which may damage the engaging protrusion.

  The present invention provides a reclining device capable of adjusting a seat back and a vehicle seat provided with a forward device for quickly moving the seat back forward so that the two-step forward operation of the seat back can be easily performed and the forward operation is performed. An object of the present invention is to provide a product with high durability by reducing the burden of parts due to the above.

In order to solve the above-mentioned problem, a seatback forward-turning device according to claim 1 is a vehicle seat provided with a reclining device that supports the seatback so that the seatback can tilt and forward-fall with respect to the seat cushion. An operating lever is pivotally supported by a fastening member on the seat cushion side bracket to be mounted, and a step portion is formed on the seat back side bracket on which the seat back is mounted, and is engaged with the step portion to prevent the seat back from being moved forward. A possible engagement protrusion is provided on the operation lever, and the operation of the operation lever allows the seat back to be moved to an intermediate position or completely forward, and the step of the seat back side bracket is brought into contact with the engagement protrusion of the operation lever. It is technical that the operating lever is provided between the operating lever and the fastening member. And butterflies.

According to the seat back forward device of the first aspect, the engagement protrusion is provided on the operation lever pivotally supported by the fastening member (fixed rivet) on the seat cushion side bracket, and the engagement protrusion and the seat back side bracket are formed. By enabling the stepped portion to be engaged, it is possible to prevent the vehicle from moving forward in the middle position when the seatback is moved forward, and it can be moved completely forward by operating the control lever. It can be performed.
In addition, by providing an escape portion (gap) between the fixed rivet and the operation lever, the operation lever receives a load from the seat back side when the stepped portion of the bracket on the seat cushion side and the engagement protrusion of the operation lever abut. Since it receives and escapes, the load from a seat back is not concentrated on one place, and damage to parts can be prevented.

Action diagram showing the normal standing position Action diagram showing locked state at intermediate position Operational diagram showing the state of starting to move forward from the intermediate position Sectional drawing which shows the relationship between the control lever 3 and the brackets 1 and 2

  A sheet adjuster 100 according to the present invention will be described with reference to FIGS.

  FIG. 1 is an operation diagram showing a state of a normal standing position, FIG. 2 is an operation diagram showing a state of being locked at an intermediate position, FIG. 3 is an operation diagram showing a state of starting to move forward from the intermediate position, and FIG. 3 is a cross-sectional view showing the relationship between 3 and brackets 1 and 2.

  As shown in FIGS. 1 to 3, the seat adjuster device 100 includes a seat back side bracket 1 that allows a seat back to be mounted, a seat cushion side bracket 2 that allows a seat cushion to be mounted, a seat back side bracket 1, and a seat. A reclining device (not shown) that rotates the cushion side bracket 2 with each other, an operation lever 3 that is operated when the seat back is tilted forward from an intermediate position, and a torsion ring 7 that biases the operation lever 3 are provided.

  The seat back side bracket 1 can be rotated with respect to the seat cushion side bracket 2 by a reclining device, and a step 9 is formed at the lower end portion of the seat back side bracket 1 so that the seat back is moved forward to a predetermined position. When this is done, it engages with an engagement rivet 5 described later.

  The operation lever 3 is rotatably fixed to the seat cushion side bracket 2 by a fixed rivet 4 described later, and is urged clockwise by a torsion spring 7 described later with the fixed rivet 4 as a rotation axis. Further, an engagement rivet 5 to be described later is fixed near the center of the operation lever 3 to limit the range in which the operation lever 3 can be rotated.

  The fixed rivet 4 rotatably connects the end of the operation lever 3 and the seat cushion side bracket 2, and the operation lever 3 rotates around the fixed rivet 4 as a rotation center. Further, as shown in FIG. 4, a slight gap is provided in the fixed portion between the fixed rivet 4 and the seat cushion side bracket 2.

  One end of the engaging rivet 5 is fixed near the center of the operation lever 3, and the other end is inserted through a long hole 8 formed in the seat cushion side bracket 2. The other end of the engagement rivet 5 moves in the long hole 8 of the seat cushion side bracket 2 when the operation lever 3 rotates. The movable range in the long hole 8 is rotatable in the operation lever 3. Determine the range.

  The auxiliary rivet 6 is fixed to the seat cushion side bracket 2 and is positioned so as to come into contact with the engagement rivet 5 when the engagement rivet 5 is positioned above the elongated hole 8 of the seat cushion side bracket 2.

  One end of the torsion spring 7 is fixed to the seat cushion side bracket 2, and the other end is hooked by a hook portion 10 formed on the operation lever 3, and the cylindrical portion of the torsion spring 7 is fitted to the fixed rivet 4. Has been.

  The forward seating device of the present invention has the above-described configuration and operates as follows.

  In a normal standing state, the seat back is locked by the reclining device as shown in FIG. When the lock by the reclining device is released and the seat back is tilted forward, the step portion 9 formed on the seat back side bracket 1 is fixed to the seat cushion side bracket 2 as shown in FIG. Abutting against the rivet 5, the seat back is prevented from being moved forward at a predetermined position.

  Here, the engagement rivet 5 is located above the elongated hole 8 of the seat cushion side bracket 2 and is in contact with the auxiliary rivet 6, and as shown in FIG. 4, the step portion of the seat back side bracket 1 rotated. 9 is in contact with the engagement rivet 5, and the engagement rivet 5 is in contact with both the seat cushion side bracket 2 and the auxiliary rivet 6, so that the load applied to the seat cushion side bracket 2 from the seat back side is dispersed. .

Further, a slight gap is provided in the fixed portion between the fixed rivet 4 and the seat cushion side bracket 2, and the stepped portion 9 of the rotated seat back side bracket 1 comes into contact with the seat cushion side bracket 2 and the engagement rivet 5. Sometimes, the operating lever 3 escapes by the gap, so that the load from the seat back is not directly applied to the fixed rivet 4.

  When the seat back is further moved forward from the intermediate position, the operation lever 3 can be pushed down as shown in FIG. When the operation lever 3 is pushed down, the engagement rivet 5 rotates together with the operation lever 3 and is detached from the step portion 9 of the seat back side bracket 1, so that the seat back can be completely moved forward.

  As described above, when the seat back is moved forward, when the seat back is moved forward, due to the contact between the step portion 9 of the seat back side bracket 1 and the engagement rivet 5, the forward movement is once at the intermediate position. Be blocked. At this time, the load from the seat back side is dispersed by the seat cushion side bracket 2 and the auxiliary rivet 6, and the operating lever 3 slightly escapes through the gap between the fixed rivet 4, so the burden on each component is reduced. The Further, when the seat back is moved forward, it is possible to push the operation lever 3 down, and the seat back can be moved forward in two stages with a simple operation.

DESCRIPTION OF SYMBOLS 1 Seat back side bracket 2 Seat cushion side bracket 3 Operation lever 4 Fixed rivet 5 Engagement rivet 6 Auxiliary rivet 7 Torsion spring 8 Long hole 9 Step part 10 Hook part

Claims (1)

In a vehicle seat provided with a reclining device that supports a seat back so that the seat back can tilt and move forward with respect to the seat cushion,
An operating lever is rotatably supported by a fastening member on a seat cushion side bracket for mounting the seat cushion, and a step portion is formed on the seat back side bracket for mounting the seat back.
An engagement protrusion capable of engaging with the stepped portion to prevent the seat back from being moved forward is provided on the operation lever.
The seat back can be moved forward or completely forward by operating the operation lever,
An escape portion is provided between the operation lever and the fastening member so that the operation lever moves by receiving a load from the seat back side when the step of the bracket on the seat back side and the engagement protrusion of the operation lever abut. A seat back advance device characterized by that.

Images