JP5866630B2 - Seat cushion flip-up type vehicle seat - Google Patents

Description

  The present invention relates to a seat cushion flip-up type vehicle seat that flips up a rear end of a seat cushion and forwards a seat back.

  A vehicle seat is provided with a seat cushion and a seat back that can be moved forward by being provided at the rear end of the seat cushion, and a configuration for setting a luggage space (luggage room) by moving the seat back forward is known. Yes.

The seat cushion is attached to a base member provided on the vehicle floor or to the vehicle floor so that it can be flipped up via a bracket.
For example, in Japanese Patent Application Laid-Open No. 2005-118326, a base member is mounted on a vehicle floor so as to be movable in the front-rear direction by a slide rail, and a seat cushion is attached to the base member so as to be able to be flipped up with respect to the base member on the vehicle floor. ing. A connecting rod obtained by bending a bar member such as a pipe member into a substantially U shape is provided between the base member and the seat cushion on the vehicle floor to connect the seat cushion to the base member. Then, the connecting rod is used as a guide for raising the seat cushion, the rear end of the seat cushion is raised (forward) and held substantially upright, and the seat back is moved forward in the space on the base member where the seat cushion is located. The luggage space is set using the back of the seat back as the loading platform.

  Here, the connecting rod has a substantially U shape having an intermediate portion and left and right arm portions, and the end of the arm portion is bent in parallel with the intermediate portion, and the bent end of the arm portion is provided on the base member. It is swingably attached to a base member on the vehicle floor via a bracket. The intermediate part of the connecting rod is inserted into the bracket support hole provided on the lower surface of the seat cushion frame (cushion frame) at a position adjacent to the front end of the seat cushion so that the cushion frame, that is, the seat cushion can swing. I support it. Both the bracket provided on the base member on the vehicle floor and the bracket provided on the seat cushion are a pair of left and right, and the shaft support hole of the bracket of the seat cushion has a substantially U-shaped cross section.

In this way, the arm portion of the connecting rod is swingably attached to the vehicle floor side (specifically, the base member on the vehicle floor), and the intermediate portion of the connecting rod is inserted into the bracket provided on the cushion frame so that the cushion frame Is supported in a swingable manner. Therefore, if the side part of the seat cushion is gripped and lifted at a rear position from the bracket of the seat cushion, the seat cushion is swung up around the intermediate part of the connecting rod while the intermediate part of the connecting rod is raised. Here, since the rear end of the seat cushion has entered under the lower end of the seat back, the seat cushion is flipped up after being pulled out to a position not disturbed by the lower end of the seat back or while being pulled out.
Then, the seat back is moved forward to the space where the seat cushion is located, and a luggage space is set with the back surface of the substantially horizontal seat back as a loading platform.

The intermediate part of the connecting rod is inserted into the substantially U-shaped shaft support hole of the bracket provided on the seat cushion, but if there is a gap in the radial direction between the intermediate part and the shaft support hole, the seat cushion will be seated and raised Regardless of the position, the middle part may rattle in the shaft support hole when the vehicle is traveling, and there is a risk that abnormal noise will occur.
For this reason, in Japanese Patent Laid-Open No. 2005-118326, a nylon support collar is fitted into a shaft support hole of a bracket on a seat cushion, a stopper plate made of a spring plate is attached to a cushion frame, and the stopper plate has a round bar pin. The intermediate portion of the connecting rod is pressed against the support collar by interposing.

  In this configuration, the intermediate portion of the connecting rod is pressed and brought into close contact with the support collar by the spring force of the stopper plate to prevent rattling, and it is possible to prevent the generation of noise due to rattling.

  The support collar is formed with two recesses for locking the round pin at the seat cushion seating position and the flip-up position. Therefore, since the round pin is locked to the corresponding recess of the support collar at the seat cushion sitting position and the flip-up position, the seat cushion moves to the seating position and the flip-up position. ) And a sense of structural luxury.

JP-A-2005-118326

  In the configuration in which the intermediate part of the connecting rod is pressed against the support collar by the spring force of the stopper plate made of a spring plate, the stopper plate is fitted into the shaft support hole of the bracket on the seat cushion, and the stopper plate is bolted to the cushion frame. Therefore, the number of parts increases and the configuration for preventing the generation of abnormal noise is complicated. Further, the assembly process becomes complicated.

The seat cushion is formed by covering a substantially rectangular cushion frame, in which a spring assembly such as an S spring is installed, with a pad (seat pad) molded from a foam material, and covering the surface of the pad with a trim cover. And has a considerable weight. Therefore, a large operating force is required for raising the seat cushion.
In particular, the seat cushion flip-up type vehicle seat is used for a rear seat such as a second seat or a third seat, and the seat cushion is for 1.5 persons or 2 persons wider than one person. Therefore, the seat cushion becomes bulky and heavy, and a large operating force is required when the seat cushion is flipped up.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a seat cushion flip-up type vehicle seat that prevents the occurrence of noise due to rattling with a simple configuration and reduces the operating force when the seat cushion is flipped up.

According to the first aspect of the present invention, a seat cushion flip-up type comprising a seat cushion with a built-in cushion frame and a rear end that can be flipped up, and a seat back that is positioned at the rear end of the seat cushion and can be moved forward. in seat of a vehicle, the seat cushion is Rutotomoni disposed on the base member placed on the vehicle floor, on its bottom side, one frame member which is formed by combining the bars in a frame shape of the seat cushion frame The frame frame has a substantially U-shaped front end frame composed of an intermediate portion located at the front end and left and right arm portions extending rearward, and includes an intermediate portion and left and right arm portions. The left and right arms of a substantially U-shaped connecting rod with a pivot are attached to the base member on the vehicle floor in a swingable manner, and the middle of the connecting rod is provided on the cushion frame. Is inserted through the shaft supporting hole of the left and right brackets, arms frame member on the coupling rod inserted through the shaft supporting hole is arranged to cross at substantially right angles, the seat cushion and pivotally supporting the cushion frame A spring member that uses the connecting rod that connects to the base member as a guide for raising the seat cushion, urges the cushion frame toward the rear end, and presses and closely contacts the shaft support hole of the bracket on the seat cushion to the intermediate portion of the connecting rod Is provided between the intermediate portion of the connecting rod and the cushion frame.
According to the second aspect of the present invention, the seat cushion spring includes a seat cushion having a built-in cushion frame and a rear end that can be flipped up, and a seat back that is positioned at the rear end of the seat cushion and can be moved forward. In a lift-type vehicle seat, a frame frame formed by combining a bar with a frame shape is incorporated on the bottom side of the seat cushion as a part of the seat cushion frame, and the frame frame is positioned at the front end. The left and right arms of a substantially U-shaped connecting rod having a substantially U-shaped front end frame comprising an intermediate portion and left and right arm portions extending rearward, and having an intermediate portion and left and right arm portions. is attached swingably to the intermediate portion of the connecting rod is inserted into the shaft supporting hole of the left and right brackets provided on the cushion frame, inserted into the shaft supporting hole has been linked locked Arms of the frame frame is arranged to cross at substantially right angles on top of, a connecting rod for coupling the seat cushion vehicle floor and the guide of the seat cushion flip-up and swingably supporting the cushion frame, then the cushion frame A spring member is provided between the intermediate portion of the connecting rod and the cushion frame so as to press the shaft supporting hole of the bracket on the seat cushion so as to be urged in the end direction to press and closely contact the shaft support hole of the bracket on the seat cushion.

The seat cushion may be disposed on the base member on the vehicle floor or directly on the vehicle floor. The invention according to claim 1 disposed on the base member on the vehicle floor, or the present invention according to claim 2 disposed directly on the vehicle floor. In any case, by providing the spring member between the intermediate portion of the connecting rod and the cushion frame, the intermediate portion of the connecting rod is pressed against the side surface of the shaft support hole of the bracket on the seat cushion by the urging force of the spring member. Thus, rattling is prevented, and generation of abnormal noise due to rattling can be prevented with a simple configuration.
Further, since the spring member urges the cushion frame, that is, the seat cushion in the rear end direction, the urging force acts in a direction to raise the rear end of the seat back, so that the operation at the time of raising the seat cushion is performed. Power is reduced.

(A) and (B) are perspective views respectively showing a seating position and a seat cushion flip-up position of a vehicle seat according to an embodiment of the present invention. (A)-(C) each show the perspective view of the connection rod in the state attached to the bracket on a base member, a top view, and a right view. The perspective view of the frame frame from the upper part in the seating position of a seat cushion is shown, and in order to prevent complication of drawing, it is shown in a state where the frame frame in the seat cushion is seen through and connected to the connecting rod. The perspective view of the frame frame from the rear in the seat cushion flip-up position is shown, and the frame frame in the seat cushion is seen through and connected to the connecting rod in order to prevent the drawing from becoming complicated. (A) (B) is a perspective view of a pair of left and right brackets provided on the frame frame, (B1) is a plan view of the bracket of (B) turned upside down, and (B2) is an arrow of (B1) The front view of the bracket seen from B2 direction is shown, respectively.

The vehicle seat includes a seat cushion having a built-in cushion frame and a rear end that can be flipped up, and a seat back that is positioned at the rear end of the seat cushion and can be moved forward. The seat cushion is arranged on a base member placed on the vehicle floor, and a frame frame formed by combining a bar with a frame shape is incorporated on the bottom side of the seat cushion as a part of the seat cushion frame. The frame frame has a substantially U-shaped front end frame composed of an intermediate portion located at the front end thereof and left and right arm portions extending rearward, and has a substantially U shape having an intermediate portion and left and right arm portions. the left and right arms of the connecting rod car floor of the base member or is attached swingably to the vehicle floor, the intermediate portion of the connecting rod is inserted into the shaft supporting hole of the left and right brackets provided on the cushion frame, axially supported holes arms of the frame the frame on the insertion has been connecting rod is arranged to cross substantially at right angles, to connect the cushion frame pivotally supported to the seat cushion base member or in the vehicle floor, The connecting rod is a guide of the seat cushion flip-up. Then, a spring member is provided between the intermediate portion of the connecting rod and the cushion frame, and the cushion frame is urged in the rear end direction so that the shaft support hole of the bracket on the seat cushion is pressed and adhered to the intermediate portion of the connecting rod. ing.
For example, the spring member is a tension spring in which one end is locked to the intermediate portion of the connecting rod and the other end is locked to the cushion frame in the front end direction of the seat cushion rather than the bracket on the seat cushion side.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIGS. 1A and 1B are perspective views respectively showing a seating position and a seat cushion spring-up position of a vehicle seat according to an embodiment of the present invention.

As shown in FIG. 1 (A), the vehicle seat 10 includes a seat cushion 12 and a seat back 14 provided at the rear end of the seat cushion. The seat cushion is a flip-up type seat. That is, as shown in FIG. 1 (B), the rear end of the seat cushion is flipped up and held almost upright, and the seat back 14 is moved forward in the space of the vehicle floor 15 where the seat cushion is located, and the back of the seat back is placed on the loading platform. The seat 10 is configured to set a luggage space as follows.
In the embodiment, the seat cushion 12 has a shape in which a seat cushion for 1.5 persons is integrated, and a base member 17 is placed on the vehicle floor 15 by a slide rail 16 so as to be movable in the front-rear direction. It is arranged so that it can be flipped up on the member. Note that the seat cushion 12 may be disposed on the vehicle floor 15 so as to be able to jump up without the base member 17 interposed.

2A to 2C show a perspective view, a plan view, and a right side view of the connecting rod in a state where the connecting rod is attached to the bracket on the base member.
As shown in FIGS. 2A to 2C, the connecting rod 18 is formed by bending a bar material into a substantially U-shape having an intermediate portion 18a and a pair of left and right arm portions 18b. The end of the portion is bent in parallel with the intermediate portion and is swingably attached to the base member by a pair of left and right brackets 20 provided on the base member 17. As can be seen from FIG. 2C, the intermediate portion 18a and the left and right arm portions 18b are formed by bending in a substantially inverted letter shape downward in a side view at the connecting portion.

The bracket 20 is formed in a substantially U-shape by bending the short piece sides of the substantially rectangular first and second plate members 20a and 20b substantially at right angles to form side walls 20a and 20b. And the attachment hole formed in the 1st board | plate material by assembling the connection shaft 20c between the side walls at one end of the long side of the board materials 20a and 20b and assembling the first and second board materials into a substantially rectangular shape in side view. The bracket 20 is bolted to the base member 17 using 20a1. The first plate member 20a of the bracket becomes a fixed piece by being bolted to the base member 17, and the second plate member becomes a movable piece by being connected to and supported by the first plate member via the connecting shaft 20c. . The left and right arm portions 18b are fixed to the upper surface of the free end of the movable piece (second plate member) 20b of the left and right brackets by, for example, welding. 17 is swingably attached.
For example, the connecting shaft 20c is provided with a head, and its free end is inserted into a support hole formed in the side walls 20a and 20b of the first and second plate members, and an E-ring is locked to the free end to Dropping is prevented.

  In the configuration in which the seat cushion 12 is disposed so as to be able to jump up to the vehicle floor 15 without the base member 17 interposed, the bracket 20 is provided on the vehicle floor by bolting the first plate member 20a to the vehicle floor, and the bracket on the vehicle floor. Thus, the seat cushion is swingably attached to the vehicle floor.

  3 and 4 show a perspective view of the frame frame from above at the seat cushion seating position and a perspective view of the frame frame from behind at the seat cushion spring-up position, respectively, in order to prevent complication of the drawings. Is also shown in a state where the frame frame in the seat cushion is seen through and connected to the connecting rod. The front and rear direction of the frame (seat cushion) is indicated by F and R.

  The frame frame 22 is formed by combining a bar with a frame shape corresponding to the planar shape of the seat cushion 12, and is incorporated as a part of the cushion frame, in particular, on the bottom side thereof. In the embodiment, the frame frame 22 is assembled by connecting straight bars with curved connection pipes. Usually, the bars are round bars and the connection pipes are round pipes.

FIGS. 5A and 5B are perspective views of a pair of left and right brackets provided on the frame, FIG. 5B is a plan view of the bracket of FIG. 5B inverted vertically, and FIG. 5B2 is FIG. The front view of the bracket seen from the arrow B2 direction of each is shown.
A pair of brackets 24 (24L, 24R) are attached to the frame frame 22 apart from each other in the lateral direction (left and right direction), and the frame frame is swingably supported by the connecting rod 18 via the pair of left and right brackets. It is connected.

The bracket 24 (24R) positioned on the right side in FIG. 3 will be described with reference to FIGS. 3, 5B, B1, and B2. The bracket 24 (24R) has a rectangular plate member 24a, A shaft support hole 24a1 having a substantially U-shaped cross section is formed in a direction (Y1-Y2 direction) perpendicular to the longitudinal direction at an intermediate portion in the longitudinal direction (X1-X2 direction), and an end adjacent to the end of the shaft support hole is formed. It is bent at a right angle in the opposite direction. Two protrusions 24a2 extending in the Y1-Y2 direction are provided on the upper surface of the substrate 24a with the shaft support hole 24a1 therebetween. Further, two mounting holes 24a3 are formed in the substrate 24a, and the frame frame is connected and fixed to a cushion frame (not shown) located inside the frame frame 22 using the mounting holes.
In FIG. 3, the bracket 24 (24L) located on the left side is symmetrically formed in the same structure as the bracket 24 (24R) located on the right side in the longitudinal direction (X1-X2 direction).

  Although the frame frame (cushion frame) 22 has a complicated shape, generally speaking, as shown in FIG. 3, an outer frame frame 22a in which rods are assembled into a substantially rectangular shape, and an intermediate portion of the outer frame frame. And a horizontal bar 22b installed between the left and right horizontal frames of the outer frame frame. Both the outer frame frame and the horizontal bar are bent in a complicated manner in consideration of the load at the time of sitting. Is formed. A front end intermediate portion of the outer frame frame 22a is a substantially U-shaped front end frame 22a1 composed of an intermediate portion 22a11 positioned at the front end of the frame frame and left and right arm portions 22a12. The free ends (rear ends) of the arms are fixed to the horizontal bars 22b, for example, by welding, to adjacent outer frame frames at adjacent portions. Further, a horizontal bar 22a13 is installed in the middle of the left and right arm portions 22a12, and the horizontal bar and the horizontal bar 22b of the outer frame frame are connected by a connecting bar 22a14 extending in the front-rear direction.

  As shown in FIG. 3, the substantially U-shaped engagement piece 22c is welded and fixed to the outer frame 22a at both ends, and is also welded and fixed to the horizontal bar by extending one end to the horizontal bar 22b. And attached to a substantially middle portion of the rear end of the outer frame frame. The engagement piece 22c protrudes from the rear end of the seat cushion 12 below the lower end of the seat back 14, and is hidden by the lower end of the seat back at the seat cushion seating position where the seat cushion is not lifted up (FIG. 1). (See (A)).

In the embodiment, the pair of left and right brackets 24 (24L, 24R) are welded and fixed to the frame frame 22 at a position adjacent to the free ends of the left and right arm portions 22a12 of the front end frame in front of the horizontal bar 22b.
That is, as shown in FIG. 3, the bracket substrate 24a is welded and fixed to the frame frame so that the arm portion 22a12 of the front end frame of the frame frame crosses the two projecting portions 24a2 of the bracket in the longitudinal direction of the bracket 24. Yes. Since the projecting portion 24a2 is provided on the upper surface of the substrate, the upper surface of the bracket substrate 24a does not directly contact the arm portion 22a12 of the front end frame, but contacts the arm portion 22a12 as a projecting portion, thereby warping the substrate 24a of the bracket. The bracket 24 can be securely attached to the frame frame 22 without being affected by the above.
If an arc groove corresponding to the radius of curvature of the arm portion 22a12 made of a round bar is provided on the upper surface (contact surface) of the protruding portion 24a2, the bracket 24 can be accurately positioned with respect to the frame frame 22.

An intermediate portion 18 a of the connecting rod is inserted through a pair of left and right brackets 24 attached to the frame frame 22. That is, the shaft support hole 24a1 in the direction orthogonal to the longitudinal direction (Y1-Y2 direction) is formed to have a width slightly larger than the diameter of the intermediate portion 18a of the connecting rod, and the intermediate portion of the connecting rod serves as the shaft support hole of the bracket. By being inserted, the connecting rod 18 supports the frame frame 22 in a swingable manner.
As shown in FIG. 5, the intermediate portion 18a of the connecting rod (shown by a dashed line), (indicated by a two-dot chain line) arms 22a 1 2 of the front frame of the frame member is a connecting rod 18 to the lower, frame member The brackets 22 are located on the bracket 24 so as to cross each other at a substantially right angle.

  A spring member 26 that biases the frame frame 22 in the rear end direction is provided between the connecting rod 18 and the frame frame (cushion frame) 22. As shown in FIG. 3, the intermediate portion 18a of the connecting rod and the horizontal bar 22a13 of the frame frame (specifically, the front end frame) are located so that the intermediate portion of the connecting rod is at the rear and the horizontal bar of the frame frame is at the front. The spring member 26 is, for example, a tension spring. One end of the spring member 26 is locked to the intermediate portion of the connecting rod, and the other end is locked to the horizontal bar of the frame frame. The frame frame (cushion frame) 22 is provided between the frame frame 22 and the frame frame 22 (cushion frame).

  As described above, the connecting rod 18 is swingably attached to the base member 17 on the vehicle floor, and the intermediate portion of the connecting rod is inserted into the shaft support hole 24a1 of the bracket attached to the left and right arm portions 22a12 of the front end frame of the outer frame frame. The outer frame frame is swingably supported by the connecting rod through the portion 18a. Therefore, the frame frame 22, that is, the seat cushion 12 is attached to the rear by a tension spring (spring member) 26 installed between the intermediate portion 18 a of the rear connecting rod and the horizontal bar 22 a 13 of the front frame frame. An urging force is applied to the seat cushion.

  As can be seen from FIG. 3, the tension spring 26 that urges the frame frame 22, that is, the seat cushion 12 to the rear side, causes the bracket (bracket of the seat cushion) 24 on the rear side (FIG. 3B) (B1 ) In the X2 direction) and press the shaft support hole (specifically, the left side wall 24a1L of the shaft support hole) against the intermediate portion 18a of the connecting rod. For this reason, the intermediate portion 18a of the connecting rod is inserted into the bracket support hole 24a1 while being pressed and closely contacted, and supports the frame frame so as to be swingable without causing rattling.

  At the seat cushion seating position where the engagement piece 22c is hidden at the lower end of the seat back, the seat cushion lower end prevents the seat cushion from jumping up, and the frame frame 22 is pivotably supported to support the base member on the vehicle floor. The movement of the connecting rod 18 provided so as to be swingable at 17 is also restricted, and the seat cushion is maintained in its seating position. Since the intermediate portion 18a of the connecting rod is pressed and brought into close contact with the shaft support hole 24a1 by the urging force of the tension spring 26, the frame frame 22 is supported without causing rattling, and therefore noise due to rattling is generated. Is prevented.

  Since the engagement piece 22c is provided at the rear end of the cushion frame (frame frame 22) and the engagement piece is engaged with the lower end of the seat back at the seating position, the rear end of the seat cushion is securely restrained by the lower end of the seat back. Is done. Therefore, the unexpected rise of the seat cushion 12 at the seating position can be prevented.

The operation of raising the seat cushion will be described. First, the base member 17 on which the seat cushion 12 is arranged is slid on the slide rail 16 and moved on the vehicle floor to the front end position. Then, the engagement piece 22c at the rear end of the frame frame is pulled out from the lower end of the seat back, and the seat cushion 12 is pulled forward until the engagement of the engagement piece with the lower end of the seat back is released. Then, the seat cushion 12 is released from the restraint by the lower end of the seat back, and the seat cushion 12 can be flipped up, and the seat cushion is flipped up by grasping the rear end or side portion of the seat cushion and swinging the seat cushion forward.
When the seat cushion is flipped up, the connecting rod 18 swings and rises on the base member, and the frame frame 22 also rises and moves such that the horizontal bar 22a13 of the front end frame approaches the intermediate portion 18a of the connecting rod. And since the urging force of the tension spring 26 that urges the frame frame 22 to the rear acts as the power of this movement, the operating force at the time of raising the seat cushion is reduced, and the operating force is smaller than before. The seat cushion can be flipped up on the base member.

  After the seat cushion is flipped up to a position substantially perpendicular to the vehicle floor 15 (substantially upright position) (see FIG. 1B), the seat back 14 is placed in the space on the base member where the seat cushion 12 was located. A luggage space (luggage room) with the back surface of the seat back as a loading platform is set by tilting it forward about a swinging shaft (not shown) at the lower end and laying it substantially horizontally.

  Even when the seat cushion is flipped up and at the flip-up position, the intermediate portion 18a of the connecting rod is pressed and brought into close contact with the shaft support hole 24a1 of the bracket 24 by the urging force of the tension spring 26, so that the frame frame 22 does not rattle. Since it supports, generation | occurrence | production of the noise resulting from rattling is prevented similarly to the seating position of a seat cushion.

  In order to return the seat cushion 12 to its seating position, the seat back 14 is first raised from a substantially horizontal position to its initial position. Then, while the seat cushion 12 is swung rearward, the engagement piece 22c at the rear end of the seat cushion is slid under the lower end of the seat back to return the seat cushion to its substantially horizontal seating position.

  Thus, by providing the spring member 26 between the intermediate portion 18a of the connecting rod and the cushion frame (frame frame 22), the intermediate portion of the connecting rod is supported by the shaft support hole of the bracket on the seat cushion side by the biasing force of the spring member. The side surface is pressed and brought into close contact with each other to prevent rattling, and generation of abnormal noise due to rattling can be prevented with a simple configuration. Also, there is no process such as bolting, and the assembly is simplified.

  Further, when the seat cushion is flipped up, the urging force of the tension spring 26 acts as a driving force that moves the horizontal bar 22a13 of the front end frame closer to the intermediate portion 18a of the connecting rod. The seat cushion can be lifted up with a smaller operating force than before.

  The spring member 26 applies a biasing force that biases the frame frame 22 rearward to the seat cushion, and presses and closely contacts the intermediate portion 18a of the connecting rod to the shaft support hole 24a1 of the bracket on the seat cushion side. It is sufficient and not limited to the tension spring. However, in a configuration in which a tension spring is installed between the intermediate portion 18a of the connecting rod and the frame frame 22 as the spring member 26, the intermediate portion 18a of the connecting rod is inserted into the support hole 24a1 of the bracket, and the end of the tension spring is connected to the connecting rod. It is sufficient to engage with the intermediate portion and the frame frame, and the assembly of the connecting rod and the frame frame can be performed easily and quickly.

  Note that when the seat cushion 12 returns from the flip-up position to the seating position, the weight of the seat cushion 12 acts as a force against the biasing force of the spring member 26, so that the seating position is not affected by the biasing force of the spring member 26. Can be returned.

  As described above, according to the present invention, the generation of abnormal noise can be prevented with a simple configuration, and the operating force when the seat cushion is flipped up can be reduced.

  The above-described embodiments are for explaining the present invention, and are not intended to limit the present invention. All modifications, alterations, etc. within the technical scope of the present invention are included in the present invention. Needless to say.

For example, the middle part of the connecting rod is inserted into a pair of left and right brackets provided on the frame frame, and the connecting rod supports the frame frame so as to be swingable, but the number of brackets on the frame frame through which the intermediate part is inserted is There is no need for a pair of left and right.
Moreover, although the rods constituting the frame frame are fixed by welding, it is needless to say that fixing by welding is an example, and fixing may be performed by a method other than welding. Furthermore, although the frame frame is entirely composed of a bar, it is not necessary to be entirely composed of a bar.

  The present invention is generally applied to a seat cushion flip-up type vehicle seat that flips up the rear end of the seat cushion and forwards the seat back. For example, the seat for a vehicle such as a train, an airplane, etc. An open space (corresponding to a luggage space) may be set on the seat by applying to a seat in a movie theater, a theater, a concert hall, etc. provided continuously in the front-rear direction.

DESCRIPTION OF SYMBOLS 10 Seat 12 Seat cushion 14 Seat back 15 Car floor 17 Base member 18 Connecting rod 18a Middle part 18b Arm part 20 Bracket (on base member) 22 Frame frame (cushion frame)
22a1 Front end frame 22a13 Horizontal bar 22c Engagement piece
24 bracket (on the frame) 24a1 shaft support hole 24a1L side wall (wall pressed against the middle part of the connecting rod)
26 Tension spring (spring member)

Claims (4)

In a seat cushion flip-up type vehicle seat comprising a seat cushion that has a built-in cushion frame and the rear end of which can be flipped up, and a seat back that is positioned at the rear end of the seat cushion and can be moved forward,
Seat cushion, Rutotomoni disposed on the base member placed on the vehicle floor, on its bottom side, the frame frame formed by combining bars in a frame shape is incorporated as part of the seat cushion frame built And
The frame frame has a substantially U-shaped front end frame composed of an intermediate portion located at the front end and left and right arm portions extending rearward.
Left and right brackets in which the left and right arm portions of a substantially U-shaped connecting rod having an intermediate portion and left and right arm portions are swingably attached to a base member on the vehicle floor, and the intermediate portion of the connecting rod is provided on the cushion frame The arm portion of the frame frame is arranged at a substantially right angle on the connecting rod inserted through the shaft support hole, and the seat cushion is supported by the cushion frame so as to be swingable. Use the connecting rod connected to the seat cushion as a guide for springing up,
A seat cushion spring provided between the intermediate portion of the connecting rod and the cushion frame with a spring member that urges the cushion frame in the rear end direction to press the shaft support hole of the bracket on the seat cushion against the intermediate portion of the connecting rod. Raised-up vehicle seat. In a seat cushion flip-up type vehicle seat comprising a seat cushion that has a built-in cushion frame and the rear end of which can be flipped up, and a seat back that is positioned at the rear end of the seat cushion and can be moved forward,
On the bottom side of the seat cushion, a frame frame formed by combining bars in a frame shape is incorporated and incorporated as part of the seat cushion frame,
The frame frame has a substantially U-shaped front end frame composed of an intermediate portion located at the front end and left and right arm portions extending rearward.
The left and right arm portions of a substantially U-shaped connecting rod having an intermediate portion and left and right arm portions are swingably attached to the vehicle floor, and the shaft support of the left and right brackets provided on the cushion frame is the intermediate portion of the connecting rod. The frame frame arms are placed at a right angle on the connecting rod inserted through the shaft support hole, and the cushion is supported so that it can swing and the seat cushion is connected to the vehicle floor. Use the rod as a guide to lift the seat cushion,
A seat cushion spring provided between the intermediate portion of the connecting rod and the cushion frame with a spring member that urges the cushion frame in the rear end direction to press the shaft support hole of the bracket on the seat cushion against the intermediate portion of the connecting rod. Raised-up vehicle seat.   3. The seat according to claim 1, wherein the spring member is a tension spring in which one end is engaged with the cushion frame in the front end direction of the seat cushion with respect to a front end of the seat cushion rather than a bracket provided on the seat cushion at one end. Cushion flip-up type vehicle seat. The bracket uses a rectangular plate as the substrate,
The shaft support hole is a hole formed in a substantially U-shaped cross section in the left-right direction at the middle part in the front-rear direction of the bracket,
Two protrusions extending in the left-right direction are provided on the upper surface of the substrate across the shaft support hole,
The seat cushion flip-up type vehicle according to any one of claims 1 to 3, wherein the arm portion of the frame frame crosses the two projecting portions of the bracket in the front-rear direction of the bracket, and the board of the bracket is welded and fixed to the frame frame. Sheet.

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