Easy entry seat with seat back mounted floor latch

[0001] This application claims the benefit of Provisional Application Ser. No. 60/294,131, filed May 29, 2001.

[0002] 1. Field of Invention

[0003] The subject invention relates to a seat assembly for an automotive vehicle, and more particularly, to a fold and tilt mechanism operatively coupled between a seat back and a seat cushion of the seat assembly for moving the seat assembly between a seating position, a folded position with the seat back pivoted against the seat cushion and an upright tilted position with the seat cushion pivoted forwardly and generally upright and the seat back pivoted about the seat cushion to an upright position.

[0004] 2. Description of the Related Art

[0005] Automotive vehicles include seat assemblies for supporting occupants within the vehicle cabin. Seat assemblies include a generally horizontal seat cushion and a generally upright seat back for supporting the back of an occupant seated upon the seat cushion. Typically, a recliner assembly is operatively coupled between the seat cushion and the seat back for allowing selectively lockable and pivotal adjustment of the seat back relative to the seat cushion between a plurality of reclined seating positions and a folded position forwardly overlying the seat cushion.

[0006] Seat assemblies also commonly include a floor latch mechanism or riser assembly that allow the seat assembly to be latched or removed from the vehicle. Additionally, the riser assembly may provide pivotal movement of the seat assembly between a seating position and a forwardly tumbled position with the seat back in the folded position against the seat cushion and the seat cushion tilted in a generally upright position to provide additional storage space behind the seat assembly within the vehicle. An example of such a riser assembly is disclosed in U.S. Pat. No. 6,227,619B1, which issued to Pesta et al. on May 8, 2001. However, such riser assemblies require space to accommodate the motion of the seat assembly between the seating and forwardly stowed positions while the seat back is in the folded position against the seat cushion.

[0007] It remains desirable to provide a seat assembly that is movable between the seating position and a stowed position that minimizes the space required to accommodate the pivotal movement of the seat assembly between the seating and stowed positions. It remains further desirable to provide a simple lock or latch mechanism that allows selective latching of the seat assembly to the vehicle while in the seating position.

[0008] According to one aspect of the invention there is provided a seat assembly for use in an automotive vehicle. The seat assembly comprises a seat cushion and a seat back pivotally assembled to the seat cushion for movement between a plurality of reclined seating positions including a fully reclined seating position relative to the seat cushion. A recliner mechanism is operatively coupled between the seat cushion and the seat back for selectively locking the seat back between any one of the plurality of reclined seating positions. A front link extends between one end pivotally coupled to the seat cushion and an opposite end pivotally coupled to the floor of the vehicle for supporting the seat cushion in a seating position above the floor of the vehicle and for guiding the seat cushion between the seat position and a flat position against the floor of the vehicle. The seat assembly includes a rear floor latch for releasably locking the seat cushion in the seating position to a striker bar fixedly secured to the floor of the vehicle and unlocking the seat cushion and the seat back for movement between the seating position and an upright position with both of the seat cushion and seat back extending generally upright from the floor of the vehicle. A rear support link is operatively coupled between the seat assembly and the floor of the vehicle for supporting and securing the seat cushion and the seat back in the upright position and for guiding the seat assembly between the seating and upright positions.

[0014] Referring to FIGS. 1–3, a seat assembly 10 is shown for supporting an occupant above a floor 16 of an automotive vehicle. The seat assembly 10 includes a seat cushion 12 and a seat back 14 pivotally coupled to the seat cushion 12 by a pivot pin 13 for pivotal movement of the seat back 14 about the pivot pin 13 relative to the seat cushion. As shown in FIG. 1, a recliner assembly 20 is operatively coupled between the seat cushionl2 and the seat back 14 for allowing selective locking and pivotal adjustment of the seat back 14 relative to the seat cushion 12 between a generally upright seating position A, a forwardly folded position B generally overlying the seat cushion 12, and a fully reclined seating position C.

[0015] Referring to FIG. 4, the recliner mechanism 20 includes a sector of teeth 22 formed in a bracket 24 fixedly secured to the seat back 14. The sector of teeth 22 are generally centered about the pivot pin 13. A pawl 24 having a rack of teeth lockably engagable with the sector of teeth 22 is slidably coupled to a support bracket 26 fixedly secured to the seat cushion 12 for sliding movement in and out of locking engagement with the sector of teeth 22. While engaged with the sector of teeth 22, the pawl 24 prevents pivotal movement of the seat back 14 relative to the seat cushion 12. With the pawl 24 disengaged from the sector of teeth 22, the seat back 14 is freely pivotable about the pivot pin 13. The pawl 24 is biased toward locking engagement with the sector of teeth 22 by a clock spring or other suitable biasing member. A release handle 25 is pivotally coupled to the support bracket 26 for manual camming actuation of the pawl between engagement and disengagement with the sector of teeth 22. Further details and operation of the recliner mechanism are fully set forth in Patent Cooperation Treaty Patent Application PCT/US02/02830 filed Feb. 1, 2002, which is incorporated herein by reference in its entirety.

[0016] Referring to FIGS. 1–3, a front link 30 extends between one end 32 pivotally coupled to the front portion of the seat cushion 12 and an opposite end 34 pivotally coupled to a riser bracket 36 fixedly secured to the floor 16. The front link 30 supports the front portion of the seat cushion 12 in a seating position spaced above the floor 16, as shown in FIG. 1. The front link 30 allows movement of the front portion of the seat cushion 12 between the seating position, as shown in FIG. 1, and a folded flat position lying against the floor 16, as shown in FIG. 2.

[0017] A rear floor latch 40 extends downwardly from the rear portion of the seat cushion 12 for selectively locking the rear portion of the seat cushion 12 in the seating position to a striker bar 43 fixedly secured to the floor 16, as shown in FIGS. 1, 2 and 4. The rear floor latch 40 includes a latch foot 42 fixedly secured to the support bracket 26. The latch foot 42 includes a U-shaped hook portion 44 for locating the rear floor latch 40 against the striker bar 43. A latch hook 46 is pivotally coupled to the latch foot 42 adjacent the hook portion 44 for movement between locked and unlocked positions. In the locked position, the striker bar 43 is lockingly retained between the hook portion 44 of the latch foot 42 and the latch hook 46. With the latch hook 46 in the unlocked position, the hook portion 44 is movable in and out of engagement with the striker bar 43. A biasing member 47 of any suitable type, such as a clock spring, biases the latch hook 46 towards the locked position. A rear release lever 48 is pivotally coupled to said support bracket 26 for camming actuation of said pawl in and out locking engagement with the sector of teeth 22. A link 49 extends between the rear release lever 48 and the latch hook 46 for simultaneously moving the pawl 24 in and out of locking engagement with the sector of teeth 22 and the latch hook 46 between the locked and unlocked positions, respectively.

[0018] A rear support link 50 extends between a first end 52 pivotally and slidably coupled with the riser bracket 36 and a second end 54 pivotally coupled to the support bracket 28 between the pivot pin 13 and the rear floor latch 40. More specifically, a slot 38 is formed in the riser bracket 36 extending between opposite front and back ends 37, 39. A pin 56 extends through both the first end 52 of the rear support link 50 and the slot 38 for allowing pivotal movement and forward and rearward movement of the first end 52 along the slot 38. Forward and rearward movement of the first end 52 is limited by engagement of the pin 56 with the front and back ends 37, 39 of the slot 38, respectively.

[0019] In operation, an occupant may sit on the seat assembly 10 in the seating position. In the seating position, the front of the seat cushion 12 is supported spaced above the floor 16 by the front link 30, as shown in FIG. 1. The latch hook 46 is in the locked position with the striker bar 43 retained between the latch hook 46 and the hook portion 44 for locking the seat cushion 12 in the seating position. The occupant may adjust the angular position of the seat back 14 by disengaging the pawl 24 from the sector of teeth 22 by rotating the release handle 25 in the clockwise direction, as viewed in the figures. The seat back 14 is then pivotally movable between the seating position A, the fully reclined seating position C, and a plurality of reclined seating positions therebetween. The seat back 14 may be locked in any one of the reclined seating positions as desired by allowing the pawl 24 to reengage the sector of teeth 22.

[0020] Alternatively, with the pawl 24 disengaged from the sector of teeth 22, the seat back 14 may be moved between any one of the reclined seating positions and the forwardly folded position B to present the back of the seat back 14 as a cargo loading floor.

[0021] With the seat back 14 in the forwardly folded position B, the latch hook 46 maybe may be moved to the unlocked position to allow movement of the seat cushion 12 and the seat assembly 10 between the seating position, as shown in FIG. 1, and the folded flat position lying against the floor 16, as shown in FIG. 2. The front of the seat cushion 12 is pivotally guided by the front link 30 from the seating position to the folded flat position. The rear of the seat cushion 12 is supported by the rear support link 50. The rear support link 50 pivots and slides forwardly along the slot 38 to guide the rear of the seat cushion 12 and the seat assembly 10 to the folded flat position. Guided by the front and rear support links 40, 50, the seat assembly 10 may be moved between the folded flat position and the seating position until when in the seating position the hook portion 44 locates against the striker bar 43 and the latch hook 46 returns to the locked position under the force of the biasing member 47.

[0022] With the seat back 14 in the fully reclined seating position C and the latch hook 46 in the unlocked position, the seat assembly 10 is freely movable between the seating position, as shown in FIG. 1, and an upright tilted position, as shown in FIG. 3. As the seat assembly 10 is moved forwardly towards the upright tilted position, the seat cushion 12, seat assembly 10 and the front link 30 are tilted in the counterclockwise direction, as viewed in the figures, until the seat cushion and back 12, 14 extend generally vertically from the floor 16 and the front link 30 is generally flat against the floor 16. The rear support link 50 pivots counterclockwise about the back end 39 of the slot 38 to support the seat assembly 10 in the upright tilted position. Guided by the front and rear support links 40, 50, the seat assembly 10 is freely movable between the upright seating position and the seating position until when in the seating position the hook portion 44 locates against the striker bar 43 and the latch hook 46 returns to the locked position under the force of the biasing member 47.

[0023] The invention has been described in an illustrative manner, and it is to be understood that the terminology, which has been used, is intended to be in the nature of words of description rather than of limitation.

[0024] Many modifications and variations of the present invention are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims, the invention may be practised other than as specifically described.