JP4193620B2 - Sheet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention mainly relates to a vehicle seat, and more particularly, to a seat having a tip-up function that rotates a seat cushion from a seated use state to a retracted state in which the seat cushion is flipped up to the seat back side.
[0002]
[Prior art]
Conventionally, this type of seat is generally configured to rotate the seat cushion to a use state or a retracted state using a link mechanism. Then, the elastic body acting on the link mechanism urges the seat cushion in a direction in which the seat cushion is always rotated to the retracted state. Therefore, when the seat cushion is in use, the link mechanism is locked to maintain the state.
For a vehicle seat having such a tip-up function, for example, the technology disclosed in Patent Document 1 is already known.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2003-40010
[Problems to be solved by the invention]
In the prior art, a lock mechanism or a lock release mechanism for holding the seat cushion in use is required. Further, since the urging force in the tip-up direction (upward direction) is always acting on the seat cushion, the seat cushion is liable to be loosened when locked in use. In some cases, a cushioning material such as rubber is used as a means for absorbing the play, but if this is done, the lock load increases and the operability is impaired.
The present invention is intended to solve the conventional problems, and its purpose is to eliminate a mechanism for locking and unlocking the seat cushion in the use state, and to prevent the seat cushion from being loose in the use state. It is to be.
[0005]
[Means for Solving the Problems]
The present invention is for achieving the above object, and is configured as follows.
The invention according to claim 1 is a seat having a tip-up function capable of rotating the seat cushion from a useable state where the seat cushion can be seated to a retracted state where the seat cushion is flipped up to the seat back side. A link mechanism that rotates the device to a use state or a storage state, and a pressing mechanism that receives an operating force for tip-up.
The link mechanism includes a link member having one end connected to the seat cushion side , and a rotating member connected to the other end of the link member and biased in the rotating direction by an elastic body. Has been. Then, the center of rotation of said seat cushion, said the link member and the reference line of the rotary member linearly a link mechanism connecting the connection point of the connection point between the link member and the seat cushion side, the reference By moving from one side to the other side with the line as a boundary, the urging force of the elastic body is set so as to be switched in a direction in which the seat cushion is rotated to a use state or a retracted state .
The pressing mechanism pushes the link member when the seat cushion is in use by receiving an operating force for tip-up, and a connection point between the link member and the seat cushion is opposite to the reference line. Configured to move to .
Accordingly , a so-called turnover function is obtained in which the urging force of the elastic body acting on the seat cushion side through the link mechanism is switched depending on the position of the connection point between the seat cushion side and the link member. Therefore, the urging force of this elastic body functions as a force for tipping up the seat cushion to the retracted state, and also acts as a force for maintaining the state when the seat cushion is in use. As a result, a mechanism for locking the seat cushion in the use state and a mechanism for releasing the lock become unnecessary, and it is possible to prevent the seat cushion from rattling in the use state.
Further, the link mechanism can be easily turned over by the action of the pressing mechanism, and the switching operation force for rotating the seat cushion from the use state to the retracted state is reduced.
[0008]
Invention of Claim 2 is the sheet | seat described in Claim 1 , Comprising: The press mechanism is rotatably supported by the rotating shaft, and the site | part supported by this rotating shaft Are divided into an action side member that can contact the link member of the link mechanism and an operation side member that receives an operation force for tip-up. In a state where the link member receives a load of a certain value or more due to a load from the seat cushion side, the operation side member when receiving an operation force for tip-up is around the axis of the rotation shaft. It is configured to rotate.
As a result, when the seat cushion in use is subjected to a heavy load by a person or baggage, only the operation side member of the pressing mechanism rotates even if an operating force for tip-up acts on the pressing mechanism. The operating force can be released.
[0009]
The invention according to claim 3 is the seat according to claim 1 or 2 , wherein the pressing mechanism is set to receive an operating force for tip-up based on an operation of tilting the seat back forward. ing.
Thereby, the seat cushion can be tipped up to the retracted state in conjunction with the tilting of the seat back.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
FIG. 1 is a side view showing an outline of a vehicle seat having a tip-up function. FIG. 2 is a side view showing the internal structure of the lower part of the seat. FIG. 3 is an enlarged side view of a part of FIG. As shown in FIG. 1, the seat includes a seat cushion 10 and a seat back 20. As shown in FIGS. 2 and 3, the leg plate 13 is located on both sides of the lower part of the seat, and the outside is covered with the cover 14.
[0011]
A rear end portion of the cushion frame 11 in the seat cushion 10 is rotatably supported by the rotation shaft 12 with respect to the leg plate 13. That is, the seat cushion 10 can be rotated (chip-up) from a use state in which the seat cushion 10 can be seated with the axis of the rotation shaft 12 as a rotation center to a retracted state in which the seat cushion 10 is flipped up to the seat back 20 side. Further, the lower portion of the back frame 21 of the seat back 20 is connected to the upper plate 13a of the leg plate 13 via a reclining device (not shown). By unlocking the reclining device, the seat back 20 can be tilted back and forth around the axis of the reclining shaft 22.
[0012]
Next, the link mechanism 30 for rotating the seat cushion 10 from the use state to the retracted state will be described. As shown in FIGS. 2 and 3, the link mechanism 30 includes a link member 31 and a rotating member 33. One end (upper end) of the link member 31 is connected to a connection bracket 11 a fixed to the cushion frame 11 by a connection pin 32. On the other hand, the base end portion (right end portion) of the rotation member 33 is supported by the support plate 34 so as to be rotatable around its axis with respect to the leg plate 13. The other end portion (lower end portion) of the link member 31 and the tip end portion (left end portion) of the rotating member 33 are connected by a connecting pin 35.
[0013]
The rotating member 33 is always urged in the arrow a direction around the axis of the support shaft 34 by the elastic body 36 shown in FIG. The rotational force of the rotation member 33 by the elastic body 36 always acts on the cushion frame 11 through the link member 31. However, the direction of the force acting on the cushion frame 11 differs depending on the position of the connecting pin 32 that is a connecting point between the link member 31 and the cushion frame 11 side. That is, the link mechanism 30 has a so-called turnover function that switches the direction of the force on the cushion frame 11 even if the direction of the rotational force acting on the rotating member 33 by the elastic body 36 is constant.
[0014]
This turnover switching line is a reference line L connecting the rotating shaft 12 and the connecting pin 35 in FIG. With this reference line L as a boundary, when the axial center (connection point) of the connecting pin 32 is at the position of the solid line on the right side of the drawing, the rotational force acting in the direction of arrow a acting on the rotating member 33 causes the cushion frame 11 to move. Work in the direction of pulling down. Conversely, when the axis of the connecting pin 32 is at the left imaginary line position, the rotational force of the rotating member 33 acts in the direction in which the cushion frame 11 is pushed up (chip up direction).
The elastic body 36 uses a spiral spring or the like provided on the axis of the support shaft 34. Further, the rotation of the rotation member 33 in the direction of the arrow a is restricted by a stopper 37 fixed to the leg plate 13.
[0015]
As shown in FIGS. 2 and 3, the pressing mechanism 40 that operates in response to an operating force for tip-up includes an action side member 42 and an operation side member 43. Further, one end portions of both members 42 and 43 are connected to each other by a rotation shaft 41 and are supported to be rotatable with respect to the leg plate 13. That is, both the members 42 and 43 can relatively rotate around the axis of the rotation shaft 41. However, the action side member 42 is urged counterclockwise in the drawing by a torsion spring (not shown) assembled on the axis of the rotation shaft 41. This urging force is received in a state where the restricting portions 42a and 43a of both the members 42 and 43 are in contact with each other. Therefore, the normal members 42 and 43 are kept in an integral relationship in the state shown in FIGS.
[0016]
A pin 42 b that can contact the edge of the link member 31 is provided on the free end side of the working side member 42. On the other hand, a tension spring 44 is hung between the free end side of the operation side member 43 and the bracket 45 fixed to the leg plate 13. By means of this spring 44, both members 42, 43 are urged in the clockwise direction of the drawing around the axis of the rotating shaft 41 while maintaining an integral relationship with each other. The bracket 45 also serves as a stopper that can receive the operation side member 43. Thereby, rotation of both members 42 and 43 by the urging | biasing force of the spring 44 is controlled by the solid line position of FIG.
[0017]
FIG. 4 is a side view showing a part of FIG. As shown in this drawing, in the pressing mechanism 40, the integral relationship between the members 42 and 43 is released under a certain condition. That is, when a load exceeding the set load of the torsion spring assembled on the axis of the rotation shaft 41 is applied between the members 42 and 43, only the operation side member 43 is around the axis of the rotation shaft 41. Rotate. This function will be described later.
[0018]
As shown in FIG. 2, on the same axis as the reclining shaft 22, an operation lever 50 that is rotatable around the axis is disposed. The operating lever 50 includes end portions 51 and 52 that extend in two directions from the center of rotation. The end 51 extending upward is positioned so as to be in contact with the operation bracket 23 fixed to the back frame 21. Therefore, when the seat back 20 (back frame 21) is tilted forward, the operation bracket 23 comes into contact with the end portion 51, and thereafter, the operation lever 50 rotates counterclockwise in FIG. 2 as the seat back 20 rotates. Will do.
[0019]
In the operating lever 50, a long hole 52a is formed in an end 52 extending downward. As is clear from FIG. 3, a substantially intermediate portion of the first interlocking member 54 is rotatably supported by the support shaft 55 on the bracket 53 fixed to the leg plate 13. A pin 54 a provided at one end of the interlocking member 54 is engaged with the elongated hole 52 a of the operating lever 50. A substantially intermediate portion of the second interlocking member 56 is rotatably supported by the bracket 53 by a support shaft 57.
[0020]
A pin 56 a is provided at one end of the second interlocking member 56. The pin 56a is positioned so as to be in contact with the other end of the first interlocking member 54 (the end opposite to the pin 54a). The other end of the interlocking member 56 and the operation side member 43 of the pressing mechanism 40 are connected by a cable 58 (inner cable 58b). Both end portions of the outer cable 58a in the cable 58 are positioned by the bracket 53 on the interlocking member 56 side, and are positioned by the bracket 59 (fixed to the leg plate 13) on the operation side member 43 side.
[0021]
Next, an operation for tipping up the seat cushion 10 to the retracted state will be described.
When the reclining device is unlocked and the seat back 20 is tilted forward, the operating lever 50 is rotated counterclockwise in FIG. 2 by the operation bracket 23 of the back frame 21 as described above. As a result, the operating lever 50 and the first interlocking member 54 rotate from the solid line position in FIGS. During the rotation of the first interlocking member 54 to the imaginary line position, the pin 56a of the second interlocking member 56 is pushed to the left in the drawing, and the interlocking member 56 rotates to the imaginary line position of FIGS. Move.
[0022]
The cable 58 (inner cable 58b) is pulled by the rotation of the interlocking member 56, and the members 42 and 43 of the pressing mechanism 40 are rotated from the solid line position to the virtual line position in FIGS. As a result, the link member 31 of the link mechanism 30 is pushed by the pin 42b of the working side member 42, and the axial center (connection point) of the connection pin 32 moves from the solid line position in FIG. Moving. As a result, as already described, the urging force of the elastic body 36 that has worked in the direction of pulling down the cushion frame 11 with respect to the link mechanism 30 is switched in the direction of pushing up the cushion frame 11. As a result, the seat cushion 10 is rotated from the use state to the retracted state and held in that state.
[0023]
In this way, when the seat back 20 is tilted forward as indicated by the phantom line in FIG. 1, the seat cushion 10 is rotated as indicated by the imaginary line in association with the seat back 20 and held in the retracted state. And the cushion frame 11 rotates to the position of the continuous line of FIG.2, 3 by returning the seat cushion 10 to a use state again. Thereby, the axial center (connection point) of the connection pin 32 in the link mechanism 30 moves from the virtual line position of FIG. Therefore, the urging force of the elastic body 36 is switched to the direction in which the cushion frame 11 is pulled down again with respect to the link mechanism 30.
[0024]
That is, when the seat cushion 10 is in a use state, the biasing force of the elastic body 36 against the link mechanism 30 works as a force for maintaining the state. For this reason, a mechanism for locking the seat cushion 10 in a use state and a mechanism for releasing the lock become unnecessary. In addition, when the seat cushion 10 is in use, it is possible to prevent backlash between the cushion frame 11 and the leg plate 13.
[0025]
The operating lever 50 side and the cable 58 side in the operating system for tip-up are separated from each other when the interlocking members 54 and 56 are separated. For this reason, when the seat cushion 10 is returned from the retracted state to the in-use state, the seat back 20 may remain in the forward inclined state indicated by the phantom line in FIG.
[0026]
In a state where the seat cushion 10 is in use, an operation force for tip-up may be applied to the pressing mechanism 40 even when a person is sitting on the seat cushion 10 or when a load is placed on the seat cushion 10. In such a case, the link member 31 of the link mechanism 30 receives a load exceeding a certain value due to the load of the seat cushion 10, that is, a load exceeding the set load of the torsion spring on the rotation shaft 41. In this state, when the seat back 20 is tilted forward and the cable 58 (inner cable 58b) is pulled, only the operation side member 43 rotates around the axis of the rotation shaft 41 as already described (see FIG. 4). As a result, the operating force for tip-up can be released and substantially canceled, and the link mechanism 30 and the pressing mechanism 40 can be protected.
[Brief description of the drawings]
FIG. 1 is a side view showing an outline of a vehicle seat having a tip-up function. FIG. 2 is a side view showing an internal structure of a lower portion of the seat. FIG. 3 is a side view showing a part of FIG. [Fig. 4] Side view showing a part of FIG.
10 Seat cushion 12 Rotating shaft (Rotating center)
20 Seat back 30 Link mechanism 32 Connection pin (connection point)
36 Elastic body 40 Pressing mechanism L Reference line

Claims (3)

A seat with a tip-up function that can rotate the seat cushion from a seated use state to a retracted state that is flipped up to the seat back side,
A link mechanism that rotates the seat cushion to a use state or a retracted state, and a pressing mechanism that receives an operation force for tip-up,
The link mechanism includes a link member having one end connected to the seat cushion side , and a rotating member connected to the other end of the link member and biased in the rotating direction by an elastic body. is the center of rotation of said seat cushion, said the link member and the reference line of the rotary member linearly a link mechanism connecting the connection point of the connection point between the link member and the seat cushion side, the reference By moving from one side to the other side with the line as a boundary, the urging force of the elastic body is set so as to be switched in a direction to rotate the seat cushion to a use state or a storage state,
The pressing mechanism pushes the link member when the seat cushion is in use by receiving an operating force for tip-up, and a connection point between the link member and the seat cushion is opposite to the reference line. A sheet that is configured to be moved to . The sheet according to claim 1,
The pressing mechanism is rotatably supported by a rotating shaft, and a working side member capable of contacting the link member of the link mechanism at a portion supported by the rotating shaft; The operation when receiving the operation force for tip-up in a state where the link member is divided into an operation-side member that receives an operation force and the link member receives a load of a certain value or more due to a load from the seat cushion side. A seat configured such that the side member rotates about the axis of the rotation shaft . The sheet according to claim 1 or 2,
The pressing mechanism is a seat set to receive an operating force for tip-up based on an operation of tilting the seat back forward .

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