JPH0121868Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a hinge mechanism applied to a forward-folding seat of a double articulation mechanism.

[Conventional technology]

Conventionally, in this type of hinge mechanism, as shown in FIG. Furthermore, the root end of the upper arm part 3 attached to the seat bag is pivotally connected, and the intermediate arm part 2 is further attached to the seat back.
A root end portion of a fan-shaped locking piece 4 connected to the bracket portion 1 and the upper arm portion 3 and urged upward by a spring 4A is pivotally attached to the intermediate portion of the locking piece 4. The convex shape 4B extending from the upper edge to the side edge is the upper arm portion 3.
A configuration is provided in which the lower edge of the locking piece 4 is shaped to be in contact with the upper edge of the upper edge of the bracket portion 1 rearward of the stepped portion 1A. The above-mentioned hinge mechanism is applied to both sides of the seat, and when the seat back is tilted backwards by a predetermined amount or more, that is, when both the intermediate arm part 2 and the upper arm part 3 are tilted backwards, the locking piece The lower edge of 4 contacts the upper edge of the upper edge of the bracket part 1 rearward of the step 1A, and therefore the locking piece 4 contacts the upper edge of the upper edge of the bracket part 1 rearward of the step 1A. The convex shape 4B extending from the upper edge to the peripheral edge of the locking piece 4, which is prevented from rotating downward, fits into the lower edge concave shape 3A of the upper arm part 3, and in this way, the upper arm part 3 is connected to the intermediate arm part 2. It is prevented from rotating relative to the However, when the seat back is raised forward, the locking piece 4 of the intermediate arm 2
When the locking piece 4 is located in front of the stepped portion 1A of the upper edge of the bracket portion 1 (the state shown in FIG. 1), the locking piece 4 can be rotated downward by the stepped portion 1A. In this state, the front half of the lower edge of the intermediate arm portion 2 is locked to a stopper 5 with a handle 5A rotatably attached to the bracket portion 1, so that the intermediate arm portion 2 does not fall forward any further and is prevented from falling backward. However, as mentioned above, the locking piece 4 is rotatable downward, so if you try to tilt the seat bag further forward, the locking piece 4 will be pushed by the lower edge of the upper arm 3. As a result, the convex shape 4B of the locking piece 4 slides out from the concave shape 3A of the upper arm part 3, and thus the rotation of the upper arm part 3 relative to the intermediate arm part 2 is not prevented.

[The problem that the idea aims to solve]

However, in the above-mentioned conventional configuration, the stopper 5 is required to prevent the intermediate arm portion 2 from falling forward, and the stopper 5 is attached to either of the hinge mechanisms on both sides, as shown in FIG. As shown, a configuration is adopted in which a pair of stoppers 5 are attached to both ends of a rotating shaft 5B that spans the seat. The stopper 5 comes into contact with the lower edge of the intermediate arm 2 in front of the protrusion on the lower edge to prevent the intermediate arm 2 from falling forward or backward.
When the stopper 5 is placed in the dotted line position in Figure 1 using the handle 5A, the engagement between the stopper 5 and the lower edge protrusion of the intermediate arm 2 is disengaged, allowing the intermediate arm 2 to be tilted backward. When the intermediate arm part 2 is completely tilted backward, the rear end of the lower edge of the intermediate arm part 2 comes into contact with the stopper 5 located at the solid line position to prevent the intermediate arm part 2 from falling further backward. However, in the above-mentioned configuration in which the rotating shaft 5B is passed across the seat, the seat structure becomes complicated, takes time to assemble, and the number of parts increases accordingly.

[Means to solve the problem]

The present invention aims to improve the above-mentioned conventional drawbacks, simplify the seat structure, save time and effort for assembly, and reduce the number of parts. an intermediate arm portion 12 whose base end is pivotally attached to the upper end portion of the portion 11; and an upper arm portion which is rotatably attached to the upper end portion of the intermediate arm portion 12 around the intermediate portion and to which a seat bag 22 is attached. 13 and
The L-shaped locking piece 14 is connected to the bracket part 11 and the upper arm part 13 and is attached to the intermediate part of the intermediate arm part 12 so as to be rotatable about the intermediate part. The edge 11A has a convex arc shape centered on the rotation axis 12A of the intermediate arm portion 12, and a concave arc notch 11B is provided at the upper end, and the lower edge of the L-shaped locking piece 14 14B has a convex arc shape that fits into the concave arc notch 11B of the bracket portion 11, and the tip portion of the L-shaped locking piece 14 can be fitted into the recess 13A on the lower edge of the upper arm portion 13, and When the intermediate arm portion 12 is tilted backward, the convex arcuate lower edge 1 of the L-shaped locking piece 14
When the front part 14D of the bracket part 11 comes into contact with the upper edge of the bracket part 11 rearward of the concave arc-shaped notch 11B, the rotation of the L-shaped locking piece 14 is prevented, and the intermediate arm part 12 stands up. In the state, the L-shaped locking piece 14
is a concave arc-shaped notch 11 on the upper edge of the bracket portion 11.
The convex arc-shaped lower edge 14B of the L-shaped locking piece 14 slides into the concave arc-shaped notch 11B, so that the L-shaped locking piece 14 becomes rotatable and the L-shaped locking piece 14 becomes rotatable. The tip portion of the L-shaped locking piece 14 can escape from the lower edge recess 13A of the upper arm 13, and at the same time, the L-shaped locking piece 14 prevents rotation of the intermediate arm 12 relative to the bracket part 11. The main points are as follows.

[Effect]

When the intermediate arm portion 12 is tilted rearward than in the upright state, the convex arc-shaped lower edge 14B and front portion 14D of the L-shaped locking piece 14 of the intermediate arm portion 12 are closer to the concave arc-shaped notch 11B of the bracket portion 11. The L-shaped locking piece 14 is in close contact with the rear upper edge 11A, and in this state, the L-shaped locking piece 14 cannot rotate, and the tip portion 14C of the L-shaped locking piece 14 fits into the recess 13A on the lower edge of the upper arm 13. to prevent the upper arm portion 13 from rotating, and the upper arm portion 13
It is locked to prevent it from falling forward. The seat back 22 is integrated with the intermediate arm portion 12 and can be folded backward or raised forward. However, when the seat bag 22 is raised to bring the intermediate arm portion 12 into an upright state, the L-shaped locking piece 14 comes to be located directly above the concave arc-shaped notch 11B of the bracket portion 11. In this state, the L-shaped locking piece 14 is rotated so that the convex arcuate lower edge 14 of the L-shaped locking piece 14
B can be slid into the concave arc-shaped notch 11B of the bracket portion 11. When the upper arm part 13 is rotated relative to the intermediate arm part 12 in this state, the L-shaped locking piece 14 is rotated and the convex arc-shaped lower edge 14B
As the L-shaped locking piece 14 retracts into the concave arc-shaped notch 11B of the bracket portion 11, the tip portion 14C of the L-shaped locking piece 14
escapes from the lower edge concave portion 13A of the upper arm portion 13, and the upper arm portion 13 becomes rotatable, thus making it possible for the seat bag 22 to fall forward with respect to the intermediate arm portion 12 via the upper arm portion 13. . The convex arcuate lower edge 14B of the L-shaped locking piece 14 is connected to the bracket portion 1.
When the L-shaped locking piece 14 is completely recessed into the concave arc-shaped notch 11B of 1, the intermediate arm portion 12 is engaged with the convex arc-shaped lower edge 14B of the bracket portion 11 is prevented from falling forward or backward. When the upper arm section 13 is raised relative to the intermediate arm section 12, the front edge of the upper arm section 13 pushes the upper end of the L-shaped locking piece 14, causing the L-shaped locking piece 14 to rotate in the opposite direction. , the convex arc-shaped lower edge 14B of the L-shaped locking piece 14 forms the concave arc-shaped notch 1 of the bracket portion 11.
When it slides out from 1B, the intermediate arm portion 12 can be tilted backward. When the intermediate arm portion 12 is tilted backward, the front portion of the convex arc-shaped lower edge 14B of the L-shaped locking piece 14 slides in close contact with the upper edge portion rearward of the concave arc-shaped notch 11B on the upper edge of the bracket portion 11. Since the L-shaped locking piece 14 moves, the rotation of the L-shaped locking piece 14 is prevented, and therefore the upper arm part 13
Rotation relative to the intermediate arm portion 12 is also prevented.

[Effect of idea]

Therefore, in the present invention, the L-shaped locking piece can prevent the upper arm from rotating relative to the intermediate arm, and prevent the intermediate arm from rotating relative to the bracket, without using the stopper. The seat structure is simplified, requiring less effort to assemble, and the number of parts is reduced.

〔Example〕

The present invention will be explained with reference to an embodiment shown in FIG.
It is attached to the frame of a cushion 21, and 12 is an intermediate arm whose root end is connected to the rotation axis 1.
The upper arm 13 is pivotally connected to the upper end of the bracket 11 via the upper end 2A, and the upper arm 13 is attached to the frame of the seat back 22 of the seat 20. It is rotatably attached to the upper end of the intermediate arm 12 about the center. The middle part of the middle arm part 12 has an L
A locking piece 14 is rotatably mounted around a rotation shaft 14A located in the middle. The upper edge 11A of the bracket part 11 has a convex arc shape centered on the rotation axis 12A of the intermediate arm part 12, and a concave arc notch 11B is provided at the upper end, and the L-shaped notch 11B is provided at the upper end. The lower edge 14B of the locking piece 14 has a convex arc shape that fits the concave arc notch 11B of the bracket portion 11, and the lower edge 14B of the L-shaped locking piece 14
The front portion 14D has a concave arc shape that fits the convex arc upper edge 11A of the bracket portion 11. Also, the L
The tip portion 14C of the shape locking piece 14 can be fitted into the recess 13A at the lower edge of the upper arm portion 13.

The above-mentioned hinge mechanism is applied to both sides of the seat or to one side of the seat, and one side is applied with the conventional hinge mechanism shown in FIG. 1, for example.

In the above hinge mechanism, as shown in FIG. 3, when the intermediate arm portion 12 is tilted rearward than in the upright state, the front portion 14D of the L-shaped locking piece 14 of the convex arcuate lower edge 14B of the intermediate arm portion 12 is the upper edge 1 of the bracket part 11
1A is in close contact with the rear upper edge of the concave arc-shaped notch 11B, and in this state, the L-shaped locking piece 14 cannot rotate, and the tip portion 14 of the L-shaped locking piece 14
C fits into the recess 13A on the lower edge of the upper arm to prevent rotation of the upper arm 13, so that the upper arm 13 is connected to the intermediate arm 12.
It is locked to prevent it from falling forward. The seat back 22 is integrated with the intermediate arm portion 12 and can be folded backward or raised forward. However, as shown in Figure 4, seat back 2
2 and the intermediate arm portion 12 is in an upright state, the L-shaped locking piece 14 is positioned directly above the concave arc-shaped notch 11B of the bracket portion 11. In this state, the L-shaped locking piece 14 is rotated and the L-shaped locking piece 14 is rotated.
The convex arcuate lower edge 14B of the bracket portion 11 can be slid into the concave arcuate notch 11B of the bracket portion 11. Therefore, when the upper arm part 13 is rotated in the direction of arrow A in FIG. The L-shaped locking piece 14 does not lock the upper arm 13, allowing the upper arm 13 to rotate. Then, the L-shaped locking piece 14 rotates and the convex arcuate lower edge 1
4B is a concave circular notch 11 of the bracket portion 11.
As it retracts into B, the tip portion 14C of the L-shaped locking piece 14 escapes from the lower edge recess 13A of the upper arm portion 13. In this way, the seat bag 22 can be tilted forward via the upper arm portion 13. As shown in FIG. 5, the convex arcuate lower edge 14B of the L-shaped locking piece 14
When the L-shaped locking piece 14 is completely recessed into the concave arc-shaped notch 11B of the bracket portion 11, the convex arc-shaped lower edge 14B of the L-shaped locking piece 14 engages with the concave arc-shaped notch 11B of the upper edge 11A of the bracket portion 11. This prevents the intermediate arm portion 12 from falling forward or backward without a stopper 5 as shown in FIG. When the seat bag 22 is raised from such a state where the seat bag 22 is tilted forward and the upper arm portion 13 is raised against the intermediate arm portion 12, the front edge of the upper arm portion 13 pushes the upper end portion of the L-shaped locking piece 14 and Rotate the L-shaped locking piece 14 in the opposite direction (reverse arrow direction in FIG. 4) so that the convex arc-shaped lower edge 14B of the L-shaped locking piece 14 touches the bracket part 11
When it slides out from the concave arc-shaped notch 11B, the intermediate arm portion 1
2 is no longer locked by the L-shaped locking piece 14 and can be tilted backwards. When the intermediate arm portion 12 is tilted backward, it returns to the state shown in FIG.
1A, the L-shaped locking piece 14 is prevented from rotating because it again slides closely against the rear upper edge of the concave arc-shaped notch 11B. Rotation is also prevented.

Other than the above embodiments, the lower edge 14B front part of the L-shaped locking piece 14 is not necessarily the convex arcuate upper edge 1 of the bracket part 11.
It does not have to be a concave arc shape that conforms to 1A,
In order to smoothly rotate the L-shaped locking piece 14 in the direction of arrow B in FIG.
may be biased in the direction of arrow B.

[Brief explanation of the drawing]

Fig. 1 is a side view of a conventional example, Fig. 2 is a side view of a conventional stopper mechanism, Fig. 3 and the following are side views of an embodiment of the present invention, Fig. 3 is a seat back tilted state, and Fig. 4 is a side view of a conventional stopper mechanism. is the seat back up state, 5th
The figure shows the seat back in the middle of being tilted forward. In the figure, 11...bracket part, 11A...upper edge of bracket part, 11B...concave circular notch, 12
...Intermediate arm portion, 12A, 14A...Rotation axis, 13
...Bicep, 13A...Bicep lower edge recess, 14...
...L-shaped locking piece, 14B...Convex arc-shaped lower edge, 20...
... Seat, 22... Seat back.

Claims (1)

[Scope of utility model registration request] A bracket part fixed to a side surface of the seat, an intermediate arm part whose root end is pivotally attached to the upper end part of the bracket part, and an intermediate arm part rotatably attached to the upper end part of the intermediate arm part about the intermediate part. an L-shaped locking piece connected to the bracket part and the upper arm part and rotatably attached to the intermediate part of the intermediate arm part, The upper edge of the bracket part has a convex arc shape centered on the rotation axis of the intermediate arm part, and a concave arc-shaped notch is provided at the upper end part, and the lower edge of the L-shaped locking piece. has a convex arc shape that fits into the concave arc notch of the bracket, the tip of the L-shaped locking piece can be fitted into the recess on the lower edge of the upper arm, and the intermediate arm is tilted backwards. In this state, the front lower edge of the L-shaped locking piece comes into contact with the upper edge rearward of the concave arc-shaped notch on the upper edge of the bracket, thereby preventing rotation of the L-shaped locking piece. When the intermediate arm is in an upright position, the L-shaped locking piece is positioned directly above the concave arc-shaped notch on the upper edge of the bracket, and the convex lower edge of the L-shaped locking piece is positioned directly above the concave arc-shaped notch on the upper edge of the bracket. By sliding into the notch, the L-shaped locking piece becomes rotatable, and the tip portion of the L-shaped locking piece can escape from the recessed portion of the lower edge of the upper arm, and at the same time, the rotation of the intermediate arm relative to the bracket portion becomes possible. A hinge mechanism for a forward-folding seat, characterized in that it is blocked by an L-shaped locking piece.