JPH0443388Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a seat cushion hinge structure for an automobile that supports a seat cushion so that it can be raised forward.

(Prior art and its problems) In recent years, the rear seats of automobiles are supported so that the seat cushion can be raised forward, and the space created between the seat cushion and the seat back that is raised forward is used to store luggage. Attempts are being made to use it as a storage area. In order to easily raise and lower the seat cushion in a narrow seating space, a hinge structure for supporting the seat cushion has conventionally been used, in which first and second hinges are attached to both front and rear ends of a bracket fixed to the floor of the vehicle body. one end of each link member is pivotally connected to each other, and both ends of a third link member are pivotally connected to the other end of these link members to constitute a four-bar rotation link mechanism, and the third link member The seat cushion, which is fixed to the seat cushion, is raised and folded by drawing different rotation trajectories at its front end and rear end.

However, in the case of such a conventional seat cushion hinge structure, not only does it require a bracket and three link members as parts, but there are also four rotating nodes, resulting in a complex structure, increased assembly man-hours, and increased costs. It had the disadvantage of increasing.

(Purpose of the invention) This invention was made in order to solve the above problem, and it is possible to obtain the same up-and-down rotation locus as the conventional four-bar rotation link mechanism, and it has a simple structure and fewer parts. The present invention aims to provide an automobile seat cushion hinge structure that can reduce assembly man-hours and costs.

(Means for Achieving the Object) In order to achieve the above object, the automobile seat cushion hinge structure according to the present invention includes a bracket fixed to the floor of the vehicle body, and a first hinge whose one end is pivotally connected to the bracket. and a second link member having one end pivotally connected to the other end of the first link member constitute a two-section rotation link mechanism, and the front end side of the seat cushion is connected to the second link member. a first pin member fixed to a predetermined position rearward of the pivoting means of the seat cushion; and a first pin member of the second link member being fixed to a predetermined position rearward of the pivoting means of the second link member. a second pin member fixed in position; and a connecting member that engages with the first and second pin members and connects them so that the distance between them can be adjusted in multiple stages, the connecting member comprising: The member has one end pivotally supported by the first pin member, and the other end includes a slit portion having a plurality of stages of locking widened portions formed of an elastic member and having a locally enlarged slit width. , the second pin member is fitted into the slit portion, and the second pin member is selectively engaged with any one of the plurality of stages of locking widening portions. .

(Function) Since the bracket, the first link member, and the second link member constitute a two-bar rotation link mechanism, the trajectories are different between the front end and rear end of the seat cushion, which is different from the conventional four-way seat cushion. It performs the same raising and lowering operation as the joint rotation link mechanism.

The front end side of the seat cushion is pivotally connected to a second link member, and a first pin member is fixed at a predetermined position of the seat cushion behind this pivot joint, and a second pin member is fixed at a predetermined position of the seat cushion behind the pivot joint. Since the seat cushion is connected to the second pin member fixed at a predetermined position of the link member by the connecting member, the seat cushion can smoothly move forward along the bracket according to the movement of the second link member. Wake up.

Further, the connecting member has one end pivotally supported by the first pin, and the other end includes a slit portion formed of an elastic member and having a plurality of stages of widened portions for locking. Since the second pin is inserted, the distance between the connecting portion of the seat cushion and the second link member can be increased by applying an external force to move the engagement position between the second pin and the slit portion. It can be adjusted in stages, and the angle of the seat cushion in the forward position can be set variably.

(Embodiment) FIG. 1 shows an exploded perspective view of an automobile seat cushion hinge structure which is an embodiment of this invention.
FIG. 2 shows an external perspective view of a rear seat to which the seat cushion hinge structure is applied. Furthermore, Figures 3 and 4 show longitudinal cross-sectional views of the seat cushion hinge structure when the seat cushion is folded backward and raised forward, respectively, and Figure 5 shows the switching operation of the tilting angle of the seat cushion. FIG. 4 shows a vertical cross-sectional view of the seat cushion hinge structure at the time of the construction.

The seat cushion hinge structure in this embodiment is applied to the rear seat of an automobile, and a third
At the upper end of the front side of the protrusion 1a formed as shown in the figure, a bracket 2 having an inverted L-shape and having ribs 2a on both side edges is attached through a mounting hole 3 formed in the center of the bracket 2. It is fixed by tightening bolt 4. A hook 5 bent into a U-shape is formed at the lower end of the bracket 2, and a bush 6 made of a soft material such as nylon is fitted inside the hook 5.

On the other hand, the front end of a first link member 7, which also has ribs 7a on both side edges, is pivotally attached to the upper end of the bracket 2 via a shaft 8. The rear end of a second link member 9, which also has ribs 9a on both side edges, is pivotally attached to the rear end of the first link member 7 via a shaft 10, and connects the bracket 2 and the first link member 9 to the rear end of the first link member 7. The link member 7 and the second link member 9 constitute a two-bar rotation link mechanism. This 2
A pair of joint rotation link mechanisms are arranged in parallel to one seat cushion 11 of the rear seat, and both sides of the back surface of the seat cushion 11 are fixed to the second link members 9 of each of the two joint rotation link mechanisms. ing. Moreover, between the left and right first link members 7,
These are connected by a stabilizer 12 that spans between them, so that the operations of the pair of left and right two-bar rotation link mechanisms can be synchronized. A bearing portion 9b is formed in a part of the rib 9a of the second link member 9, while the bracket 1 fixed to the frame 13 of the seat cushion 11
4 is also formed with a bearing portion 14a corresponding to the bearing portion 9b, and these bearing portions 9b and 14a are connected to the shaft 15.
It is pivotally connected via. Further, a locking pin 16 as a pin member is fixed on the lower surface side of the second link member 9 in a direction perpendicular to the longitudinal direction of the second link member 9, and one seat cushion 11 Also on the upper surface side of the side bracket 14, a shaft 17 as a pin member is fixed in a direction perpendicular to the longitudinal direction of the bracket 14 at a position corresponding to the locking pin 16. The connection by this connection member 18 and the bearing portions 9b, 1 described above
The seat cushion 11 is fixed on the second link member 9 by means of a pivot 15 at 4a. The connecting member 18 is connected to the seat cushion 11.
A base member 19 pivotally attached to a side shaft 17 and a hairpin-shaped elastic yoke member 20 provided to sandwich the base member 19 from both sides are joined at their clamping portions. The elastic yoke member 20 is formed with a ring-shaped locking widened part 20a having a locally enlarged slit width in multiple stages (two stages in this embodiment). A locking pin 16 on the second link member 9 side is locked to one of the links 20a _{, 20a1} . Furthermore, a ring-shaped stopper 21 is provided on the lower surface side of the second link member 9, which corresponds to an intermediate position between the bearing portion 9b and the locking pin 16. Then, with the seat cushion 11 tilted backward, the stopper 21 rests on the cushion member 22 made of an elastic material such as rubber provided on the upper surface of the first link member 7, and the seat cushion 21 is placed on the cushion member 22 made of an elastic material such as rubber. The seat cushion 11 is configured to receive a heavy load on the cushion 11 via a stopper 21 and a cushion member 22, and to set the height position of the seat cushion 11 at this time with the stopper 21. Further, when the seat cushion 11 is in the forwardly raised position, the stopper 21 engages with the hook 5 of the bracket 2, and the seat cushion 11 in the forwardly raised position is moved forward and backward while the vehicle is running. It is configured to prevent rocking. The lower end of the bracket 2 and the front end of the second link member 9 are connected by a band 23. The length of this band 23 is such that it does not hinder the raising and lowering movement of the seat cushion 11, and that the seat cushion 1
Seat cushion 1 in the position where 1 is tilted down.
1 is set to a length that can prevent it from lifting upward. In this embodiment, the upper end of the band 23 is attached to the mounting surface portion 9c at the front end of the second link member 9.
Further, the lower end is fastened and fixed to the rear mounting surface 2b of the hook 5 of the bracket 2 with screws 24 and 25, respectively.
Locking rings are provided at both ends of the bracket 2, and these rings are attached to the front end of the second link member 9 and the bracket 2.
The connection may be made by being engaged with a hook 5 formed at the lower end of the holder.

Next, the operation of this seat cushion hinge structure will be explained. When the seat cushion 11 is folded backwards and used as a seat, the first link member 7 is extended rearward, while the second link member 9 is extended backwards, as shown in FIG. It will be in a folded position on top of 7. At this time, the ring-shaped stopper 21 provided on the lower surface side of the second link member 9 is connected to the first link member 7.
The seat cushion 11 rests on a cushion member 22 provided on the upper surface side of the seat cushion 11, and this stopper 21 functions as a member for setting the height of the seat cushion 11. Further, since the load applied to the seat cushion 11 is received via the stopper 21 and the cushion member 22, the load applied to the seat cushion 11 is received by the second link member 9.
No impact is generated between the first link member 7 and the first link member 7 supporting the first link member 7, and generation of abnormal noise is also prevented.
On the other hand, the lower end of the bracket 2 and the second link member 9
At this time, the band 23 that connects the front end of the seat cushion 11 is in a fully expanded state, partially wrapping around the hook 5 at the lower end of the bracket 2, thereby causing the front end of the seat cushion 11 to move upward. Controls lifting. The band 23 also functions as a decorative member that hides this seat cushion hinge structure.

When the rear end side of the seat cushion 11 is lifted from the above-mentioned backward position, the first link member 7 is moved to the shaft 8.
The second link member 9 rotates counterclockwise using the shaft as a fulcrum, while the second link member 9 rotates clockwise using the shaft 10 as a fulcrum, so the seat cushion 11 rotates differently on its front end and rear end. It rotates while drawing a motion locus and assumes the forward-raised position shown in Fig. 4. At this time, the ring-shaped stopper 21 on the second link member 9 side
engages with the hook 5 on the bracket 2 side. This engagement restricts the front-backward rocking of the seat cushion 11 while the vehicle is running. Note that the seat cushion 11 is quite heavy, so unless you lift the seat cushion 11,
The engagement of the stopper 21 with the hook 5 is never released.

In the case of this embodiment, the seat cushion 11 and the seat back 26 are moved forward as shown in FIG.
The package tray 27 is horizontally suspended between the package tray 27 and the space below the package tray 27 and above the package tray 27 to be used as a place to store luggage. Therefore, in this case, the seat cushion 11 and the package tray 27
It will form part of the interior of the car.

Further, as shown in FIG. 6, for example, the seat back 26 can be folded forward, and when the seat cushion 11 is raised forward, the seat back 26 is folded forward as shown by the imaginary line, thereby widening the luggage storage space. When you want to secure the height of the seat back 26,
Depending on whether a headrest is attached to the seat bag 26 or not, the seat cushion 11 may get in the way when the seat cushion 11 is in the forward position when the package tray 27 is placed horizontally. There may be cases where it is not possible to move things forward completely. Therefore, in such a case, by pushing the rear end side of the seat cushion 11 further forward from the state shown in FIG. 4, the angle of the forward posture of the seat cushion 11 can be changed as shown in FIG. Be changed. That is, due to the above pushing movement, the seat cushion 11 overcomes the locking resistance between the locking widened portion 20a ₁ of the connecting member 18 and the locking pin 16 and further rotates counterclockwise about the shaft 15 as a fulcrum. do. As a result, the locking pin 16 is connected to the connecting member 18.
The elastic yoke member 20 is released from one of the widened locking portions _20a1 , and while pushing and expanding the slit portion of the elastic yoke member 20, it moves to the other widened locking portion _20a2 and is locked there. Therefore, the seat cushion 11 is raised forward to a larger angle. In this embodiment, since the wide locking portions 20a of the connecting member 18 are formed at two locations, the forward tilting angle of the seat cushion 11 is switched in two stages.
By forming a large number of a, the forward tilting angle of the seat cushion 11 can be changed over multiple stages.

When returning the seat cushion 11 from the forward posture shown in FIG. 4 to the backward posture shown in FIG. 3, first lift the entire seat cushion 11 upward to disengage the ring-shaped stopper 21 and the hook 5. , After that, when the rear end side of the seat cushion 11 is pushed toward the rear and downward, the seat cushion 11 falls backward while tracing a rotational trajectory opposite to that when the seat cushion 11 is raised forward. At this time, the range of rotation of the second link member 9 with respect to the first link member 7 is limited by the band 23 that connects the bracket 2 and the second link member 9. 9 does not rotate more than necessary, and as a result, the seat cushion 11 can be smoothly rotated within the narrow seat space and returned to its original reclining position.

In the above embodiment, the seat cushion hinge structure of this invention was applied to a rear seat, but it can be similarly applied to a front seat.

(Effects of the invention) As described above, the automobile seat cushion hinge structure according to the invention constitutes a two-section rotation link mechanism by the bracket, the first link member, and the second link member, and has a simple construction. The structure allows the seat cushion to achieve different rotation trajectories at its front and rear ends, allowing it to perform the same raising and lowering motion as a conventional four-section rotating link mechanism, reducing the number of parts, assembly man-hours, and cost. can do.

Further, the front end side of the seat cushion is pivotally connected to a second link member, and a first pin member fixed at a predetermined position of the seat cushion behind this pivot joint, and a first pin member fixed to a predetermined position of the seat cushion behind the pivot joint. Since the second link member is connected to the second pin member fixed at a predetermined position by the connecting member, the seat cushion smoothly moves along the bracket according to the movement of the second link member. It is brought up in advance. As a result, less space is required in front for the forward raising operation of the seat cushion.

Furthermore, the connecting member has one end connected to the first
The second pin is pivotally supported by the pin, and the other end is provided with a slit portion formed of an elastic member and having a plurality of wide locking portions, and the second pin is fitted into this slit portion, so that no external force can be applied. In addition, by moving the engagement position between the second pin and the slit portion, the distance between the seat cushion and the connecting portion of the second link member can be adjusted in multiple stages. As a result, the angle of the seat cushion when it is folded forward can be variably set in multiple stages, allowing the package tray to be hung horizontally at the relevant location or the seat back to be folded forward, making it possible to utilize the seat cushion space in a variety of ways. becomes possible.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of an automobile seat cushion hinge structure that is an embodiment of this invention, and FIG. 2 is a perspective view of a rear seat to which this embodiment is applied.
Figures 3 and 4 are longitudinal sectional views showing the operation of the seat cushion hinge structure when the seat cushion is folded backwards and raised forward, respectively, and Figure 5 is the operation of switching the angle of the seat cushion when it is tilted forward. FIG. 6 is a side view showing a state in which the seat bag is folded forward when the seat cushion is raised forward. 1...floor panel, 2...bracket, 7...
...First link member, 8... Shaft, 9... Second link member, 10... Shaft, 11... Seat cushion, 15... Shaft, 16... Locking pin, 17...
Shaft, 18...connecting member.

Claims (1)

[Claims for Utility Model Registration] A bracket fixed to the floor of a vehicle body, a first link member having one end pivotally connected to the bracket, and one end pivotally connected to the other end of the first link member. and a second link member configured to form a two-bar rotation link mechanism, a pivoting means for pivotally coupling the front end side of the seat cushion to the second link member, and a pivoting means for pivoting the front end of the seat cushion to the second link member. a first pin member fixed at a predetermined rear position; a second pin member fixed at a predetermined position rearward from the pivoting means of the second link member; and the first and second pins. a connecting member that engages with the members and connects them so that the distance between them can be adjusted in multiple stages, the connecting member having one end pivotally supported by the first pin member, and the other end of the connecting member The device includes a slit portion having a plurality of stages of locking widened portions formed of an elastic member and having a locally enlarged slit width, and the second pin member is inserted into the slit portion, and the plurality of stages of locking are performed. A seat cushion hinge structure for an automobile, characterized in that the second pin member is selectively engaged with any of the widened portions.