Vehicle seat frames and vehicle seats

Abstract

To obtain a vehicle seat frame which can be switched to a full flat form and stored by one action and inhibit rattling from being caused in a seat cushion when the seat is used.SOLUTION: A vehicle seat frame 10 includes: a four link mechanism 60 which enables a cushion frame 22 to tilt down; a reclining mechanism 56; hinge links 78 each of which is rotatably connected to the cushion frame 22 and a back frame 32 and causes the cushion frame 22 to tilt down in conjunction with the back frame 32 being inclined forward; guide recessed parts 84 each of which is provided at the cushion frame and open to the seat rear side; and guide pins 86 each of which is provided at a floor attachment part 40 and fitted in the guide recessed part 84 from the seat rear side by the cushion frame 22 being displaced from a tilt down position side to a seat used position.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a vehicle seat and its frame.

Background Art

[0002] Patent Document 1 below discloses a vehicle seat that can be tilted down and switched to a full flat state. This vehicle seat has a tilt-down mechanism that stores the seat cushion and the seat back in an overlapping state by sinking the seat cushion downward in the front-lower direction with the seat back folded forward, and a recliner that adjusts the reclining angle of the seat back with respect to the floor. The tilt-down mechanism has a four-bar link mechanism including a front link that connects the front portion of the seat cushion so as to be swingable in the seat front-rear direction with respect to the floor, and a rear link that connects the rear portion of the seat cushion so as to be swingable in the seat front-rear direction with respect to the floor. The recliner connects the lower portion of the seat back so as to be angle-adjustable in the seat front-rear direction with respect to the rear link. When this vehicle seat is used for seating, the four-bar link mechanism is rotationally locked by a lock portion. Further, when this vehicle seat is stored, the reclining lever and the tilt-down lever are each operated.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above prior art, when the rigidity of the lock portion is insufficient, play occurs in the seat cushion during seating use. Further, since it is necessary to operate both the reclining lever and the tilt-down lever when storing the vehicle seat, the vehicle seat cannot be put into the stored state by a one-action operation.

[0005] In consideration of the above facts, the present invention aims to provide a vehicle seat frame and a vehicle seat that can be switched to a fully flat position and stored with a single action, and that can suppress rattling of the seat cushion when the seat is in use. [Means for solving the problem]

[0006] The first embodiment of the vehicle seat frame includes a floor mounting portion attached to the floor of the vehicle body, a cushion frame constituting the skeleton of the seat cushion of the vehicle seat, a back frame constituting the skeleton of the seat back of the vehicle seat, a four-bar linkage mechanism connecting the cushion frame to the floor mounting portion so as to be tiltable, a reclining mechanism connecting the back frame to the floor mounting portion so as to be tiltable forward and backward, a hinge link rotatably connected to the cushion frame and the back frame respectively, which tilts down the cushion frame in conjunction with the forward tilting of the back frame, a guide recess provided on one of the cushion frame and the floor mounting portion and opening toward one side in the front-rear direction of the seat, and a guide projection provided on the other of the cushion frame and the floor mounting portion, which fits into the guide recess from the one side when the cushion frame is displaced from the tilt-down position to the seated position.

[0007] In the first embodiment of the vehicle seat frame, the floor mounting portion is attached to the vehicle floor. The cushion frame, which constitutes the skeleton of the seat cushion of the vehicle seat, is connected to the floor mounting portion so as to be tiltable by a four-bar linkage mechanism. The back frame, which constitutes the skeleton of the seat back of the vehicle seat, is connected to the floor mounting portion so as to be tilted forward and backward by a reclining mechanism, and can be switched to a fully flat position. Hinge links, which are rotatably connected to the cushion frame and the back frame respectively, tilt down the cushion frame in conjunction with the forward tilting of the back frame. This makes it possible to store the seat cushion and seat back with a single action. Furthermore, when the cushion frame is displaced from the tilted-down position to the seated position, a guide projection provided on the other side of the cushion frame and floor mounting portion fits into a guide recess provided on one side of the cushion frame and floor mounting portion from one side in the front-rear direction of the seat. This makes it possible to suppress rattling of the seat cushion when seated.

[0008] In the second embodiment, the vehicle seat frame, in the first embodiment, includes a rear link rotatably connected to the rear of the cushion frame and the floor mounting portion, respectively, wherein the rear link is slidable in the seat longitudinal direction relative to either the cushion frame or the floor mounting portion, and the sliding of the guide protrusion in the seat longitudinal direction within the guide recess is permitted.

[0009] In the second embodiment of the vehicle seat frame, the rear link included in the four-bar linkage mechanism is rotatably connected to the rear of the cushion frame and the floor mounting portion, respectively, and is slidable in the seat longitudinal direction relative to either the cushion frame or the floor mounting portion. This allows the guide protrusion to slide in the seat longitudinal direction within the guide recess. This sliding can absorb pitch changes between the rotation axes of the hinge link, and can absorb play in the seat longitudinal direction when the seat cushion is in use.

[0010] A third embodiment of a vehicle seat frame, in the first or second embodiment, has an engaging portion in the cushion frame that engages with the hinge link when the back frame is tilted forward, and the cushion frame is displaced in the tilt-down direction by the engagement.

[0011] According to the third embodiment of the vehicle seat frame, when the back frame is tilted forward, the cushion frame is displaced in the tilt-down direction by the engagement of an engagement portion provided on the cushion frame with a hinge link. This allows the back frame and the cushion frame to be linked with a simple configuration.

[0012] A vehicle seat of the fourth embodiment has a vehicle seat frame of any one of the first to third embodiments, and the seat cushion and seat back are constructed from the cushion frame and back frame provided on the vehicle seat frame.

[0013] In the fourth embodiment of the vehicle seat, the seat cushion and seat back are constructed from a cushion frame and back frame provided by the vehicle seat frame. Since this vehicle seat frame is one of the first to third embodiments, the aforementioned functions and effects are obtained. [Effects of the Invention]

[0014] As described above, the vehicle seat frame and vehicle seat according to the present invention allow for switching to a fully flat position and storage with a single action, and suppress the occurrence of rattling in the seat cushion when seated. [Brief explanation of the drawing]

[0015] [Figure 1] This is a side view showing a part of a vehicle seat according to the first embodiment, and it shows the initial locked state of the reclining mechanism. [Figure 2]It is a side view corresponding to FIG. 1 showing the state of the vehicle seat according to the first embodiment during storage. [Figure 3] It is a side view corresponding to FIG. 1 showing the stored state of the vehicle seat according to the first embodiment. [Figure 4] It is a side view corresponding to FIG. 1 showing the full reclining state of the vehicle seat according to the first embodiment. [Figure 5] It is a perspective view showing a part of the vehicle seat frame according to the first embodiment, and is a view showing the first-stage locking state of the reclining mechanism. [Figure 6] It is a perspective view showing an enlarged part of FIG. 5. [Figure 7] It is a side view showing an enlarged part of FIG. 2. [Figure 8] It is a side view corresponding to FIG. 7 showing the state immediately before the first-stage locking state. [Figure 9] It is a side view showing an enlarged part of FIG. 4. [Figure 10] It is a side view for explaining the variation in the pitch between the rotation axes of the hinge links near the first-stage locking position. [Figure 11] It is a side view for explaining the variation in the pitch between the rotation axes of the hinge links. [Figure 12] It is a side view corresponding to FIG. 7 showing a part of the vehicle seat according to the second embodiment. [Figure 13] It is a side view corresponding to FIG. 8 showing a part of the vehicle seat according to the second embodiment. [Figure 14] It is a side view corresponding to FIG. 9 showing a part of the vehicle seat according to the second embodiment.

Mode for Carrying Out the Invention

[0016] <The First Embodiment> The vehicle seat 10 according to the first embodiment of the present invention will be described below with reference to Figures 1 to 11. Note that some reference numerals may be omitted in the figures for clarity. The arrows FR, LH, and UP, as indicated in the figures, indicate the front, left, and top of the vehicle seat 10, respectively.

[0017] As shown in Figures 1 to 4, the vehicle seat 10 according to the first embodiment comprises a seat cushion 12 on which the vehicle occupant sits and a seat back 14 that supports the occupant's back. As shown in Figures 1 to 5, this vehicle seat 10 comprises a vehicle seat frame 20 having a cushion frame 22 that constitutes the skeleton of the seat cushion 12 and a back frame 32 that constitutes the skeleton of the seat back 14. In addition to the cushion frame 22 and the back frame 32, this vehicle seat frame 20 is composed of a floor mounting portion 40 attached to the vehicle body floor F, a four-bar linkage mechanism 60 that connects the cushion frame 22 to the floor mounting portion 40 so that it can be tilted down, a reclining mechanism 56 that connects the back frame 32 to the floor mounting portion 40 so that it can be tilted forward and backward, and a pair of left and right hinge links 78 (the right hinge link 78 is not shown) that are rotatably connected to the cushion frame 22 and the back frame 32, respectively.

[0018] As shown in Figure 5, the cushion frame 22 has a pair of left and right side frames 24, a front frame 26 connecting the front ends of the left and right side frames 24 in the left-right direction, and a rear frame 28 connecting the rear ends of the left and right side frames 24 in the left-right direction. The left and right side frames 24 extend in the front-rear direction on the left and right sides of the seat cushion 12. The front frame 26 extends in the left-right direction on the front of the seat cushion 12. The rear frame 28 extends in the left-right direction on the rear of the seat cushion 12. The left and right side frames 24 and the front frame 26 are made of, for example, press-formed metal plates, and the rear frame 28 is made of, for example, metal pipes.

[0019] The back frame 32 includes a pair of left and right side frames 34, an upper frame (not shown) connecting the upper ends of the left and right side frames 34 in the left-right direction, and a lower frame 36 connecting the lower ends of the left and right side frames 34 in the left-right direction. The left and right side frames 34 extend vertically on the left and right sides of the seat back 14. The upper frame extends horizontally on the upper part of the seat back 14, and the lower frame 36 extends horizontally on the lower part of the seat back 14. The left and right side frames 34 and the lower frame 36 are made of, for example, press-formed metal plates, and the upper frame is made of, for example, metal pipes.

[0020] The floor mounting section 40 is composed of a pair of left and right slide rails 42, a pair of left and right front risers 48, a pair of left and right rear risers 50, a B bracket 52, and a connecting pipe 54. The left and right slide rails 42 are positioned below the left and right side frames 24 of the cushion frame 22. Each slide rail 42 comprises a lower rail 44 fixed to the vehicle floor F and an upper rail 46 supported so as to be slidable in the front-rear direction relative to the lower rail 44. The lower rail 44 and the upper rail 46 are elongated with their longitudinal side in the front-rear direction.

[0021] The left and right front risers 48, left and right rear risers 50, and B bracket 52 are made of, for example, press-formed metal plates, and the connecting pipe 54 is made of, for example, metal pipe. The left and right front risers 48 and the left and right rear risers 50 may be formed as a single unit, or the left rear riser 50 and the B bracket 52 may be formed as a single unit. The left and right front risers 48 are fixed to the upper front surface of the left and right upper rails 46, and the left and right rear risers 50 are fixed to the upper rear surface of the left and right upper rails 46. The left and right rear risers 50 extend upward from the left and right front risers 48. The B bracket 52 is fixed to the upper part of the left rear riser 50.

[0022] The B bracket 52 is plate-shaped with its thickness oriented in the left-right direction. The lower part of the B bracket 52 is superimposed on the upper part of the left rear riser 50 from the outside in the left-right direction and is fixed to the left rear riser 50 by bolt fastening. The left and right rear risers 50 are connected in the left-right direction by a connecting pipe 54 which is arranged with the left-right direction as the axial direction. The upper part of the B bracket 52 faces the lower end of the left side frame 34 of the back frame 32 from the outside in the left-right direction. A recliner 58, which constitutes the main part of the reclining mechanism 56, is positioned between the B bracket 52 and the left side frame 34. The lower end of the left side frame 34 is connected to the B bracket 52 via this recliner 58. The lower end of the right side frame 34 is rotatably connected to the right rear riser 50 around an axis coaxial with the recliner 58.

[0023] The reclining mechanism 56 described above has a release lever (not shown) for releasing the lock on the recliner 58. The release lever is provided, for example, on the side of the rear of the seat cushion 12 or on the shoulder of the seat back 14. When the release lever is operated and the lock on the recliner 58 is released, the seat back 14 is configured to be able to rotate (tilt) around the axis of the recliner 58 relative to the floor mounting portion 40. Specifically, the seat back 14 is able to tilt between the forward-tilting position shown in Figure 3 and the full-reclining position shown in Figure 4. When the seat back 14 is positioned between the initial locking position shown in Figure 1 and the forward-tilting position shown in Figure 3, the recliner 58 is configured not to be locked. When the seat back 14 is positioned between the initial locking position shown in Figure 1 and the full-reclining position shown in Figure 4, the tilt angle of the seat back 14 can be adjusted in multiple stages by the recliner 58.

[0024] The four-bar linkage mechanism 60 comprises a pair of left and right front links 62 rotatably connected to the front of the left and right side frames 24 of the cushion frame 22 and to the left and right front risers 48, respectively, and a rear link 64 rotatably connected to the rear of one of the left and right side frames 24 (in this case, the left side frame 24) and to one of the left and right rear risers 50 (in this case, the left rear riser 50). The left and right front links 62 and rear links 64 are formed in an elongated shape from, for example, press-formed metal plates.

[0025] Each of the left and right front links 62 is rotatably connected to the front of the left and right side frames 24 around left and right connecting shafts (not shown) whose axis is in the left-right direction. Each of the left and right front links 62 is rotatably connected to the left and right front risers 48 around left and right connecting shafts 66 whose axis is in the left-right direction.

[0026] One longitudinal end of the rear link 64 is rotatably connected to the rear of the left side frame 24 around a connecting shaft 68 whose axis is in the left-right direction. The connecting shaft 68 is inserted through an elongated hole 25 formed in the rear of the left side frame 24 and is prevented from falling out of the elongated hole 25 by means of crimping or other means. The elongated hole 25 has its longitudinal direction in the front-rear direction, and the connecting shaft 68, i.e., one longitudinal end of the rear link 64, is slidable in the front-rear direction relative to the left side frame 24. The other longitudinal end of the rear link 64 is rotatably connected to the left rear riser 50 around a connecting shaft 70 whose axis is in the left-right direction. This four-bar linkage mechanism 60 connects the seat cushion 12 to the floor mounting portion 40 so that it can tilt down from the seating position shown in Figures 1 and 4 to the storage position (tilt-down position) shown in Figure 3.

[0027] The left and right hinge links 78 are formed into long plates from, for example, press-formed metal sheets and are positioned outward in the left-right direction relative to the lower ends of the left and right side frames 34 of the seat back 14. One longitudinal end of each left and right hinge link 78 is rotatably connected to the lower ends of the left and right side frames 34 of the seat back 14 around left and right connecting shafts 80, with the left-right direction as the axis. The other longitudinal end of each left and right hinge link 78 is rotatably connected to the rear ends of the left and right side frames 24 of the seat cushion 12 around left and right connecting shafts 82, with the left-right direction as the axis.

[0028] As shown in Figure 6, one of the left and right side frames 24 (in this case, the left side frame 24) has an engaging portion 24A that protrudes inward in the left-right direction at its rear end. This engaging portion 24A contacts or is close to the lower part of the hinge link 78 from the front when the seat cushion 12 is in the seated position and the seat back 14 is in the first locked position. When the recliner 58 is released and the seat back 14 is tilted forward from the first locked position, the engaging portion 24A is pushed forward by the hinge link 78, causing the seat back 14 to displace from the seated position to the stowed position. As a result, the left and right front links 62 and rear links 64 each assume a forward-tilted position. At this time, the seat cushion 12, which is connected to the seat back 14 via the left and right hinge links 78, is configured to displace (tilt down) to the stowed position in conjunction with the forward tilting of the back frame 32.

[0029] As shown in Figure 1, when the seat cushion 12 is in the seated position, the left and right connecting shafts 82 are positioned near the axis of the recliner 58, allowing the seat back 14 to be tilted backward from the initial lock position toward the full recline position (see Figure 4). In other words, when the seat back 14 is positioned between the initial lock position and the full recline (full flat) position, the left and right connecting shafts 82 remain positioned near the axis of the recliner 58, and the left and right hinge links 78 are configured to rotate together with the seat back 14.

[0030] As shown in Figures 1 to 5 and Figures 7 to 9, guide recesses 84 (the right guide recess 84 is not shown) are formed at the rear ends of the left and right side frames 24. The left and right guide recesses 84 are notches formed at the rear ends of the left and right side frames 24, and are formed in an elongated shape with the longitudinal side in the front-to-back direction and opening toward the rear. The rear ends of the left and right side frames 24 where the left and right guide recesses 84 are formed have an outer shape that is roughly U-shaped and opens toward the rear, and are covered by a resin cover 88 (see Figures 7 to 9; not shown in Figures 1 to 6) which has a similar outer shape.

[0031] Corresponding to the left and right guide recesses 84, the B bracket 52 and the right rear riser 50 are each provided with guide pins 86, which are guide protrusions. The left and right guide pins 86 are cylindrical in shape with the left-right direction as their axial direction, and protrude outward in the left-right direction from the B bracket 52 and the right rear riser 50. The left and right guide pins 86 are made of, for example, metal and are fixed to the B bracket 52 and the right rear riser 50 by means of welding or other means.

[0032] In the vehicle seat 10 with the above configuration, when the retracted seat back 14 is raised from the forward-tilted position to the first-stage locked position, the seat cushion 12 is displaced from the tilt-down position (retracted position) to the seated position, causing the left and right guide pins 86 to engage with the left and right guide recesses 84 from the rear. Just before the seat cushion 12 reaches the seated position (i.e., just before the seat back 14 reaches the first-stage locked position), the left and right connecting shafts 68 slide forward within the left and right elongated holes 25, the longitudinal ends of the left and right rear links 64 slide forward relative to the left and right side frames 24, and the left and right guide recesses 84 slide rearward relative to the left and right guide pins 86.

[0033] As described above, in this embodiment, the left and right rear links 64 are made slidable in the front-rear direction (horizontal direction) relative to the left and right side frames 24, thereby allowing relative sliding in the front-rear direction (horizontal direction) between the left and right guide recesses 84 and the left and right guide pins 86. The relative sliding between the left and right guide recesses 84 and the left and right guide pins 86 corrects the movement trajectory of the connecting shaft 82 at the rear end of the seat cushion 12 to sliding in the front-rear direction. As a result, variations in pitch and pitch changes due to deformation between the connecting shafts 80 and 82 in the left and right hinge links 78 are absorbed, and the front-rear play of the seat cushion 12 is suppressed.

[0034] In other words, if the vehicle seat frame 20 does not have left and right guide recesses 84 and left and right guide pins 86, the movement trajectory of the axis of the connecting shaft 82 at the rear end of the seat cushion 12 will be an arc-shaped trajectory as shown by the dashed line A in Figure 10, as shown in Figure 10. Here, for example, if the pitch between the connecting shafts 80 and 82 in the left and right hinge links 78 varies within the range of the dashed lines P1 and P2 shown in Figure 10 due to variations in the dimensions or deflection of the vehicle seat frame 20, the seat cushion 12 will wobble in the front-rear direction within the range of the dimension line L1 shown in Figure 10 near the initial lock position.

[0035] In contrast, in this embodiment, near the initial locking position, the left and right guide recesses 84 and the left and right guide pins 86 slide relative to each other, so that the movement trajectory of the axis of the connecting shaft 82 at the rear end of the seat cushion 12 becomes a straight line trajectory as shown by the imaginary line S in Figure 11. As a result, even if the pitch between the connecting shafts 80 and 82 in the left and right hinge links 78 varies within the range of the imaginary lines P1 and P2 shown in Figure 11, the play in the front-rear direction of the seat cushion 12 near the initial locking position is reduced to the range of the dimension line L2 shown in Figure 11 (L2 <L1)。

[0036] Furthermore, in this embodiment, when the vehicle seat frame 20 is in the range from the initial locked state to the fully reclined state, the load of the occupant is supported by the left and right front links 62 and the left and right guide pins 86. Also, when the vehicle seat frame 20 is in the range closer to the stowed state than the initial locked state, the left hinge link 78 contacts the engaging portion 24A of the left side frame 24, thereby restricting the downward displacement of the seat cushion 12, and the left and right rear links 64 restrict the upward displacement of the seat cushion 12.

[0037] Next, the operation and effects of this embodiment will be described.

[0038] In the vehicle seat 10 with the above configuration, the seat cushion 12 and seat back 14 are each composed of a cushion frame 22 and a back frame 32 provided on the vehicle seat frame 20. The floor mounting portion 40 of this vehicle seat frame 20 is attached to the vehicle floor F. The cushion frame 22 is connected to the floor mounting portion 40 so as to be tiltable by a four-bar linkage mechanism 60. The back frame 32 is connected to the floor mounting portion 40 so as to be tiltable forward and backward by a reclining mechanism 56, and can be switched to a fully flat position. Left and right hinge links 78, which are rotatably connected to the cushion frame 22 and the back frame 32 respectively, tilt down the cushion frame 22 (i.e., the seat cushion 12) in conjunction with the forward tilting of the back frame 32 (i.e., the seat back 14). This makes it possible to store the seat cushion 12 and seat back 14 with a single action.

[0039] Furthermore, when the cushion frame 22 is displaced from the tilt-down position to the seated position, the guide pins 86 provided on the floor mounting portion 40 engage with the left and right guide recesses 84 provided on the cushion frame 22 from the rear. This makes it possible to suppress rattling in the seat cushion 12 when seated.

[0040] Furthermore, in this vehicle seat frame 20, the rear link 64 included in the four-bar linkage mechanism 60 is rotatably connected to the rear end of the cushion frame 22 and the floor mounting portion 40, respectively, and is also slidable in the front-rear direction relative to the cushion frame 22. This allows the left and right guide pins 86 to slide in the front-rear direction within the left and right guide recesses 84. This sliding absorbs the pitch change between the rotation axes of the hinge link 78, thereby absorbing the front-rear play when the seat cushion 12 is in use.

[0041] Furthermore, in this vehicle seat frame 20, when the back frame 32 is tilted forward, the engagement portion 24A provided on the cushion frame 22 comes into contact with the left hinge link 78, causing the cushion frame 22 to be displaced in the tilt-down direction. This allows the back frame 32 and the cushion frame 22 to be linked with a simple configuration.

[0042] <Second Embodiment> Next, a second embodiment of the present invention will be described. Note that components and operations that are essentially the same as those in the first embodiment will be given the same reference numerals as in the first embodiment, and their descriptions will be omitted.

[0043] Figure 12 shows a side view of a portion of the vehicle seat frame 90 according to the second embodiment, corresponding to Figure 7. Figure 13 shows a side view of a portion of the vehicle seat frame 90 according to the second embodiment, corresponding to Figure 8. Figure 14 shows a side view of a portion of the vehicle seat frame 90 according to the second embodiment, corresponding to Figure 9.

[0044] In the vehicle seat frame 90 according to the second embodiment, one longitudinal end of each left and right rear link 64 is connected to the rear of each left and right side frame 24 so as to be rotatable around left and right connecting shafts 68 with the left-right direction as the axis, and so as not to slide in the front-rear direction. The other longitudinal ends of each left and right rear link 64 are connected to the left and right rear risers 50 so as to be rotatable around left and right connecting shafts 70 with the left-right direction as the axis. The left and right connecting shafts 70 are inserted through elongated holes 65 formed in the left and right rear risers 50, and their detachment from the elongated holes 65 is prevented by means of crimping or the like. The left and right elongated holes 65 have the front-rear direction as their longitudinal axis, and the left and right connecting shafts 70, i.e., the other longitudinal ends of the left and right rear links 64, are slidable in the front-rear direction relative to the left and right rear risers 50.

[0045] Guide recesses 92 (the right-side guide recess 92 is not shown) are formed in the front of the B bracket 52 and the right-side rear riser 50. The left and right guide recesses 92 are notches formed in the front of the B bracket 52 and the right-side rear riser 50, and are formed in an elongated shape with the longitudinal side in the front-rear direction and opening toward the front. The front of the B bracket 52 and the right-side rear riser 50 where the left and right guide recesses 92 are formed is provided with a portion with an outer shape that is roughly U-shaped and opens toward the front, and this portion is covered by a resin cover 94 having a similar outer shape.

[0046] The connecting shafts 68, located at the rear ends of the left and right side frames 24, are shared components and serve as guide protrusions. The left and right connecting shafts 68 are cylindrical in shape with their axial direction running horizontally and protrude inward from the left and right side frames 24 in the horizontal direction. The left and right connecting shafts 68 are made of, for example, metal and are fixed to the left and right side frames 24 by means of welding or other means.

[0047] In the vehicle seat 10 with the above configuration, when the retracted seat back 14 is raised from the forward-tilted position to the first-stage locked position, the seat cushion 12 is displaced from the tilt-down position (retracted position) to the seated position, causing the left and right connecting shafts 68 to engage with the left and right guide recesses 92 from the front. Just before the seat cushion 12 reaches the seated position (i.e., just before the seat back 14 reaches the first-stage locked position), the left and right connecting shafts 70 slide rearward within the left and right elongated holes 65, the other ends in the longitudinal direction of the left and right rear links 64 slide rearward relative to the rear riser 50, and the left and right guide recesses 92 slide forward relative to the left and right connecting shafts 68.

[0048] As described above, in this embodiment, the left and right rear links 64 are made slidable in the front-rear direction (horizontal direction) relative to the left and right side frames 24, thereby allowing relative sliding in the front-rear direction (horizontal direction) between the left and right guide recesses 92 and the left and right connecting shafts 68. The relative sliding between the left and right guide recesses 92 and the left and right connecting shafts 68 corrects the movement trajectory of the connecting shafts 68 at the rear end of the seat cushion 12 to sliding in the front-rear direction. As a result, variations in pitch and pitch changes due to deformation between the connecting shafts 80 and 82 in the left and right hinge links 78 are absorbed, and the front-rear play of the seat cushion 12 is suppressed. In this embodiment, the configuration other than that described above is the same as in the first embodiment. In this embodiment as well, basically the same operation and effect as in the first embodiment can be obtained.

[0049] Although the present invention has been described above with reference to two embodiments, the present invention can be implemented with various modifications without departing from its spirit. Furthermore, it goes without saying that the scope of the present invention is not limited to the above embodiments. [Explanation of Symbols]

[0050] 10 Vehicle seats 12 seat cushions 14 Seatback 20 Vehicle seat frames 22 Cushion Frame 24A Engagement part 32 Backframe 40 Floor mounting section 56 Reclining mechanism 60 4-bar linkage mechanism 64 Rear Link 68 Connecting shaft (guide protrusion) 78 Hinge links 84 Guide recess 86 Guide pin (guide protrusion) 92 Guide recess

Claims

1. A floor mounting part that is attached to the floor of the vehicle body, The cushion frame that constitutes the framework of the seat cushion of a vehicle seat, The back frame that constitutes the frame of the seat back of the aforementioned vehicle seat, A four-bar linkage mechanism is provided, which connects the cushion frame to the floor mounting section so that it can be tilted down. A reclining mechanism is provided, in which the back frame is connected to the floor mounting portion so that it can be tilted forward and backward. A hinge link is rotatably connected to the cushion frame and the back frame, respectively, and tilts down the cushion frame in conjunction with the forward tilting of the back frame, A guide recess is provided on one of the cushion frame and the floor mounting portion, and is open toward one side in the front-rear direction of the seat, A guide projection is provided on the other side of the cushion frame and the floor mounting portion, and when the cushion frame is displaced from the tilt-down position to the seated position, it fits into the guide recess from one side, A vehicle seat frame equipped with the following features.

2. The aforementioned four-bar linkage mechanism includes a rear link that is rotatably connected to the rear of the cushion frame and the floor mounting portion, respectively. The vehicle seat frame according to claim 1, wherein the rear link is slidable in the seat front-rear direction relative to either the cushion frame or the floor mounting portion, and the guide protrusion within the guide recess is permitted to slide in the seat front-rear direction.

3. The seat frame for a vehicle according to claim 1 or 2, wherein the cushion frame has an engaging portion that engages with the hinge link when the back frame is tilted forward, and the cushion frame is displaced in the tilt-down direction by the engagement.

4. A vehicle seat having a vehicle seat frame according to claim 1 or claim 2, wherein the seat cushion and seat back are constructed by the cushion frame and back frame provided on the vehicle seat frame.

Images