GB2439459A

GB2439459A - Vehicle seat with linkage assembly

Info

Publication number: GB2439459A
Application number: GB0712131A
Authority: GB
Inventors: Kyle Calvert; Alexander Jorg Koblischke
Original assignee: Lear Corp
Current assignee: Lear Corp
Priority date: 2006-06-23
Filing date: 2007-06-22
Publication date: 2007-12-27
Also published as: DE102007017260B4; GB0712131D0; DE102007017260A1; US20070296258A1

Abstract

A vehicle seat assembly 10 which is positionable in a vehicle passenger compartment and attachable to a vehicle floor 18. The seat assembly 10 includes a seat bottom 12, a seat back 14, and a five-bar linkage assembly 16 pivotally attaching the seat back 14 to the seat bottom 12. The five-bar linkage assembly 16 includes a forward linkage 40 pivotally connected to a first pivot point at the front of the seat bottom and a second pivot point on the vehicle floor, a rear linkage 60 pivotally connected to a third pivot point at the rear of the seat bottom and a fourth pivot point on the vehicle floor, and a folding linkage 80 pivotally connected to the third pivot point and a fifth pivot point. These allow movement of the vehicle seat assembly 10 from an upright to a folded assembly. Preferably the seat back moves from an upright position to a 0 degree angle folded position (see Figure 2). A latch may be provided for locking the seat back in various positions.

Description

I

REAR SEAT EXTENDED FOLD AND KNEEL RECONFIGURATION

The invention relates to a seat assembly that is extendable in a forward direction and stows in a minimal space.

Prior art vehicle seat assemblies include a seat back pivotally attached to a seat bottom. These prior art assemblies allow movement of the seat back from upright to folded positions. In one specific assembly, the seat back is attached to the seat bottom via a four-bar mechanism.

Such a four-bar seat assembly is set forth in U.S. Patent No. 6,578,919. Although such four-bar seats have been used successfully in rear seat vehicle applications, current automotive design trends require rear seats that occupy a lower amount of space when such seat assemblies are in the folded position. Unfortunately, the four-bar mechanism provides a somewhat limited range of motion making it difficult for such seats to meet the more current automobile design requirements and to conform to curbed vehicle floors.

Accordingly, there exists a need for improved vehicle seat assemblies with lower package space and near zero degree load floor angle. More generally it is therefore desirable to provide an improved seat assembly which addresses the above described problems and/or which offers improvements or an alternative to existing arrangements.

According to the present invention there is therefore provided a vehicle seat assembly as described in the accompanying claims.

An embodiment of the present invention solves one or more problems of the prior art by providing in at least one embodiment a vehicle seat assembly which is positionable in a vehicle passenger compartment and attachable to a vehicle floor. The seat assembly includes a seat bottom, a seat back, and a five-bar linkage assembly pivotally attaching the seat back to the seat bottom. The five-bar linkage assembly includes a forward linkage, a rear linkage, and a folding linkage. The forward linkage has a first forward linkage end and a second linkage end. The forward linkage end pivotally attaches to a forward location of the seat bottom at a first pivot position, and the second forward linkage end pivotally attaches to the vehicle floor at a second pivot position. Similarly, the rear linkage has a first rear linkage end and a second rear linkage end. The first rear linkage end pivotally attaches to a rear location of the seat bottom at a third pivot location, and the second end pivotally attaches to the vehicle at a fourth pivot position. Finally, the folding linkage has a first folding linkage end and a second folding linkage end.

The first folding linkage end pivotally attaches to the third pivot location, and the second folding linkage end pivotally attaches to a fifth pivot position.

Advantageously, the five-bar linkage assembly allows for movement of the seat bottom in a forward direction as the seat back folds downward to a folded position thereby providing minimal package space. -3.-

The present invention will now be described by way of example only with reference to the following figures in which: FIGURE 1 is a side view of the vehicle seat assembly of an embodiment of the invention with a seat back in an upright position; FIGURE 2 is a side view of the vehicle seat assembly of an embodiment of the invention with a seat back in a folded position; FIGURE 3 is a perspective view of the vehicle seat assembly of an embodiment of the invention with a seat back in an upright position; FIGURE 4A is a side view of an embodiment of a seat assembly in the closed position; FIGURE 4B is a side view of an embodiment of a seat assembly in an intermediate position between the closed and design position; FIGURE 4C is a side view of an embodiment of a seat assembly in the design position; and FIGURE 4D is a side view of an embodiment of a seat assembly in a reclined position.

Reference will now be made in detail to presently preferred compositions or embodiments and methods of the invention, which constitute the best modes of practicing the invention presently known to the inventors.

With reference to Figures 1, 2, and 3, schematic illustrations of an embodiment of a vehicle seat assembly of the present invention is provided. Figure 1 is a side view of the vehicle seat assembly of the invention with a seat back in an upright position. Figure 2 is a side view of the vehicle seat assembly of the invention with a seat back in a folded position. Figure 3 is a perspective view of the vehicle seat assembly of the invention with a seat back in an upright position. Seat assembly 10 includes a seat bottom that includes seat bottom frame 12, and a seat back which includes seat back frame 14. The seat bottom is pivotally attached to the seat back by five-bar linkage assembly 16. Typically, such attachment is made by pivotally attaching seat bottom frame 12 to seat back frame 14. Seat assembly 10 is also pivotally attached to vehicle floor 18 via five-bar linkage assembly 16. Typically, such attachment is accomplished by one or more attached brackets 20, 22. In one variation of the present embodiment, brackets 20, 22 are distinct brackets that attach vehicle seat assembly 10 to vehicle floor 18. In another variation of the present embodiment, brackets 20, 22 are an integral part of vehicle floor 18. The seat bottom (and seat bottom frame 12) includes front side 24, rear side 26, left side 28, and right side 30. Similarly, seat back 14 includes top side 32, bottom side 34, left side 36 and right side 34.

Still referring to Figures 1, 2, and 3, five-bar linkage assembly 16 includes forward linkage 40 having first forward linkage end 42 and second linkage end 44.

First forward linkage end 42 is pivotally attached to forward location 46 of the seat bottom via seat bottom frame 12 at first pivot position 48. Similarly, second forward linkage end 44 is pivotally attached to vehicle floor 18 via bracket 22 at a second pivot position 50.

Five-bar assembly 16 also includes rear linkage 60 which includes first rear linkage end 62 and second rear linkage end 64. First rear linkage end 62 is pivotally attached to rear location 66 of the seat bottom at third pivot location 68. Second rear linkage end 64 pivotally attaches vehicle floor 18 at a fourth pivot position 70 via bracket 20.

Five-bar linkage assembly 16 also includes folding linkage 80. Folding linkage 80 has first folding linkage end 82 and second folding linkage end 84. First folding linkage end 82 is pivotally attached to third pivot location 68.

Second folding linkage end 84 pivotally attaches to fifth pivot position 90 which is also pivotally attached to seat back frame 14. Collectively, five-bar linkage assembly 16 allows for movement of the seat bottom in a forward direction as the seat back folds downward. Seat back frame 14 is also pivotally attached to bracket 20 at sixth pivot position 92 which is attached to vehicle floor 18. The attachment of seat back frame 14 at sixth position 92 provides stability to vehicle seat assembly 10. Seat back frame 14 is held in the upright position by a mechanism known in the art of vehicle seat technology. Figures 1 and 2 illustrate a latching mechanism in which stop pin 96 engages stopping surface 98 to keep seat back frame 14 in the upright position.

Stilling referring to Figures 1 and 2, vehicle seat assembly 10 is moveable from an upright position as illustrated in Figure 1 to a folded position as illustrated in Figure 2. During motion from the upright to the folded position the seat back (and seat back frame 12) moves along curved direction dl while the seat bottom (and seat bottom frame 12) moves forward along direction d2. Moreover, the seat bottom (and seat bottom frame 12) also moves downward when seat assembly 10 is folded. In one variation, seat assembly 10 has a load floor angle of less than 10 degrees when in the folded position. The load floor angle is defined as angle Al as illustrated in Figure 2.

Specifically, the load floor angle is the angle between the seat back in the upright and folded positions. In another variation of the present embodiment, seat assembly 10 has a load floor angle of less than 5 degrees when in the folded position. In yet another variation of the present embodiment, seat assembly 10 has a load floor height angle of about 0 degrees when in the folded position. In still another variation of the present embodiment, seat assembly has a load floor angle from about 0 to about 5 degrees when in the folded position. When in the folded position, vehicle seat assembly 10 advantageously allows a reduction

in height hi as compared to prior art vehicle seat

assemblies.

With reference to Figure 3, the positioning of two five-bar linkage assemblies 16, 16' on opposing sides of seat bottom frame 12 and seat back frame 14 is provided.

As set forth above, seat bottom frame 12 includes left side 28 and right side 30 while seat back frame 14 includes left side 36 and right side 34. Five-bar assembly 16 attaches right side 30 of seat bottom frame 12 to the right side 38 of seat back frame 14. Second five-bar linkage assembly 16' pivotally attaches left side 28 of seat bottom frame 12 to the left side 36 of seat back frame 14. Five-bar assemblies 16, 16' are substantially the same and described above in detail.

With reference to Figures 4A-D, a series of schematic side views of the seat assembly of the invention at various positions is provided. Figure 4A provides a side view of seat assembly 10 in the closed position. In this view, the ability of the present invention to conform to the shape of vehicle floor 18 is provided. In Figure 4A, vehicle floor 18 has a section that curves downward. The five bar folding mechanism of the present invention allows seat assembly 10 to fold down into this curve. Bottom seat cushion 50 and seat back cushion 52 are also depicted.

Figure 4B provides a side view of the seat assembly in an intermediate position between the fold position and the design position (i.e., the position when a vehicle occupant sits in the seat) . Figure 4C provides a side view of seat assembly 10 in the design position. Finally, Figure 4D provides a side view of seat assembly 10 in a reclined position. It should be appreciated that the design of the present embodiment allows positioning of the seat in the reclined position from the design positioning with minimal pivoting of seat bottom frame 12. Instead, most of the pivoting allowing seat assembly 10 to achieve the reclined positioned is via pivoting of folding linkage 80 about third pivot location 68. Specifically, in positioning from the design position to the reclined position, folding linkage 80 traverse an angle with greater absolute value than the angle traversed by rear linkage 60 about third pivot location 68.

While embodiments of the invention have been illustrated and described, it is not intended that these embodiments illustrate and describe all possible forms of the invention. Rather, the words used in the specification are words of description rather than limitation, and it is understood that various changes may be made without departing from the scope of the invention.

Claims

CLAI MS

1. A vehicle seat assembly positioriable in a vehicle passenger compartment and attachable to a vehicle floor, the seat assembly comprising: a seat bottom; a seat back; a five-bar linkage assembly pivotally attaching the seat back to the seat bottom, the five-bar linkage assembly comprising: a forward linkage having a first forward linkage end and a second linkage end, the forward linkage end pivotally attached to a forward location of the seat bottom at a first pivot position, and the second forward linkage end pivotally attached to the vehicle floor at a second pivot position; a rear linkage having a first rear linkage end and a second rear linkage end, the first rear linkage end pivotally attached to a rear location of the seat bottom at a third pivot location, and the second end pivotally attached to the vehicle at a fourth pivot position; and a folding linkage having a first folding linkage end and a second folding linkage end, the first folding linkage end pivotally attached to the third pivot location, and the second folding linkage end pivotally attached to a fifth pivot position wherein the five-bar linkage assembly allows for movement of the seat bottom in a forward direction as the seat back folds downward to a folded position.

2. The vehicle seat assembly of claim 1 wherein when the seat back is in the folded position the vehicle seat assembly has a load floor angle of less than 10 degrees.

3. The vehicle seat assembly of claim 1 or 2 wherein when the seat back is in the folded position the vehicle seat assembly has a load floor angle of less than degrees.

4. The vehicle seat assembly of any preceding claim wherein when the seat back is in the folded position the vehicle seat assembly has a load floor angle of about 0 degrees.

5. The vehicle seat assembly of any one of claims 1 to 3 wherein when the seat back is in the folded position the vehicle seat assembly has a load floor angle from about 0 to about 5 degrees.

6. The vehicle seat assembly of any preceding claim further comprising one or more brackets that attach the vehicle seat assembly to the vehicle floor.

7. The vehicle seat assembly of claim 6 wherein the one or more brackets include the second and fourth pivot positions.

8. The vehicle seat assembly of any preceding claim further comprising a bracket that is attached to the vehicle floor and pivotally attaches to the seat back.

9. The vehicle seat assembly of any preceding claim wherein the seat bottom includes a right and left side, and the seat back includes a right and left side such that the five-bar assembly attaches the right side of the seat bottom to the right side of the seat back.

10. The vehicle seat assembly of any preceding claim further comprising a second five-bar linkage assembly that pivotally attaches the left side of the seat bottom and to the left side of the seat back.

11. The vehicle seat assembly of any preceding claim further comprising a latching mechanism for holding the seat back in an upright prosition.

12. The vehicle seat assembly of any preceding claim wherein the seat back is positionable into a reclined position with the folding linkage traversing an angle with greater absolute value than a angle traversed by the rear linkage about the third pivot location.

13. A vehicle seat assembly positionable in a vehicle passenger compartment and attachable to a vehicle floor, the seat assembly comprising: a seat bottom having a left side and a right side; a seat back having a left side and a right side; a first five-bar linkage assembly pivotally attaching the right side of the seat back to the right side of the seat bottom; a second five-bar linkage assembly pivotally attaching the left side of the seat back to the left side of the seat bottom; wherein the first and second five-bar linkage assemblies each independently comprise: a forward linkage having a first forward linkage end and a second linkage end, the forward linkage end pivotally attached to a forward location of the seat bottom at a first pivot position and the second forward linkage end pivotally attached to the vehicle floor at a second pivot position; a rear linkage having a first rear linkage end and a second rear linkage end, the first rear linkage end pivotally attached to a rear location of the seat bottom at a third pivot location and the second end pivotally attached to the vehicle at a fourth pivot position; and a folding linkage having a first folding linkage end and a second folding linkage end, the first folding linkage end pivotally attached to the third pivot location and the second folding linkage end pivotally attached to a fifth pivot position wherein the five-bar linkage assembly allows for movement of the seat bottom in a forward direction as the seat back folds downward to a folded position.

14. The vehicle seat assembly of claim 13 wherein the bottom bracket is integral to a vehicle floor or the bottom bracket is attached to a vehicle floor.

15. The vehicle seat assembly of claim 13 or 14 wherein when the seat back is in the folded position the vehicle seat assembly has a load floor angle of less than degrees.

16. The vehicle seat assembly of any one of claims 13 to 15 wherein when the seat back is in the folded position the vehicle seat assembly has a load floor angle from about 0 to about 5 degrees.

17. The vehicle seat assembly of any one of claims 13 to 16 further comprising one or more brackets that attach the vehicle seat assembly to the vehicle floor and include the second and fourth pivot positions.

18. The vehicle seat assembly of claim 17 wherein the one or more brackets include the second and fourth pivot positions.

19. A vehicle seat assembly substantially as hereinbefore described with reference to, and/or as shown in any one or more of figures 1 to 4D.