Vehicle seat latch assembly having molded cinch member

CA 02461778 2004-03-25

VEHICLE SEAT LATCH ASSEMBLY HAVING MOLDED CINCH MEMBER

BACKGROUND OF THE INVENTION

Field of the Invention

Vehicle seat latch assemblies, and more particularly to vehicle seat latch assemblies having a molded cinch member.

Description of the Related Art

It is known in the art that motor vehicles often incorporate seat assemblies that are capable of pivoting to increase the amount of cargo space available in the vehicle. Typically, known prior art seat assemblies include a frame assembly that is adapted to be pivotally mounted to the floor of the vehicle to support a seat assembly. The seat frame assembly generally includes support structure including side support arms front and back supports and a seat back support spacing apart the side support arms. The seat frame assembly also includes two seat back legs and two stationary seat front legs. Latch assemblies typically associated with the two seat back legs are used to attach to floor strikers permanently attached to the floor of the vehicle. The seat back legs are adapted to be rotatably attached to the seat back end on each side of the side support arms. The stationary front legs are pivotally mounted to the front end of each of the side support arms allowing the seat frame assembly to pivot about the stationary front legs relative to the vehicle floor.

Typical assemblies include multiple latch mechanisms associated with each side of a seat assembly. Generally, a structural latch and an anti-rattle latch are each utilized for each seat back leg. The multiple latch assemblies provide a secure cinching of the seat assembly to a floor striker, as well as prevents rattle of the seat assembly due to vibrations of the vehicle. The multiple latches increase the overall cost of a seat assembly, as well as increase the manufacturing costs of a vehicle.

-1CA 02461778 2004-03-25

There is therefore a need in the art for a latch mechanism that utilizes only one latch to structurally cinch the seat assembly to a floor of a vehicle, as well as to provide anti-rattle characteristics.

There is also a need in the art for a vehicle seat latch assembly that cinches or attaches to strikers in the vehicle floor, does not rattle and is easily unlatched by a user using a minimal amount of force.

SUMMARY OF THE INVENTION

The vehicle seat latch assembly of the present invention solves the deficiencies and needs of the prior art by providing a vehicle seat latch assembly including a structural latch member having a first engagement surface that is adapted for secondary engagement with a striker. A deformable latch member is attached to the structural latch member. The deformable latch member has a second engagement surface that extends beyond the first engagement surface for primary engagement with the striker. The second engagement surface has a greater offset angle derived from a pivot point than an offset angle of the first engagement surface derived from the pivot point.

The deformable latch member is attached to the structural latch member and engages the striker in a first position. The deformable latch member collapses in response to a force exerted on the vehicle latch assembly to a second position wherein the structural latch member engages a striker.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other features of the invention will appeal' from the following description and from the drawings in which:

Figure 1 is an environmental perspective view of the vehicle seat latch assembly of the present invention incorporated into a seat frame assembly;

Figure 2 is an enlarged perspective view of the seat latch assembly shown in Figure 1;

-2CA 02461778 2004-03-25

Figure 3 is a perspective view showing the structural latch member of the vehicle seat latch assembly;

Figure 4 is a perspective view of a second embodiment of the invention detailing the structural latch member having a deformable latch member attached to both sides of the structural latch member;

Figure 5 is a sectional view of the structural latch member and deformable latch member shown in Figure 4;

Figure 6 is a perspective view detailing a fust embodiment of a structural latch member having a deformable latch member attached to one side of the structural latch member;

Figure 7 is a sectional view of the structural latch member and deformable latch member shown in Figure 6.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to Figures 1 and 2, a seat cushion frame assembly is generally shown at 10. The seat cushion frame assembly 10 is adapted to be pivotally mounted to the floor of the vehicle for supporting the seat cushion frame assembly 10 and occupant within the vehicle. The seat cushion frame assembly 10 includes two side support arms 12, having a seat front end 13 and a seat back end 15, and a seat back support 14 attached between the seat back ends 15 of the side support arms 12, thereby connecting and spacing apart the side support arms 12. The seat cushion frame assembly 10 further includes two seat back legs 16, two stationary front legs 18, latch assemblies 20, and floor strikers 22. A seat cushion frame assembly 10 is adapted to attach to the vehicle floor by the two seat back legs 16 and the two seat front legs 18. The seat back legs 16 are adapted to be rotatably attached to the seat back end 15 of each of the side support arms 12. The two stationary seat front legs 18 are pivotally mounted to the front end 13 of each of the two side support arms 12 allowing the seat cushion

-3CA 02461778 2004-03-25 frame assembly 10 to pivot about the stationary seat legs 18 relative to the vehicle floor. The floor strikers 22 are adapted to be mounted to the floor of the vehicle and engage the latch assemblies 20 as will be discussed in more detail below.

The latch assemblies 20 include a structural steel latch member 30 and a deformable latch member 40, both of which are operatively attached to the seat back legs 16.

Referring to Figure 3, there is shown a structural latch member 30 that has a first engagement surface 35 that is adapted for secondary engagement with the striker 22. In a preferred aspect, the structural latch member 30 comprises a hook shaped body 40 having a shank portion 45 terminating in a curved portion 50. The shank portion 45 includes a slot 47 formed there through for pivotally engaging the seat frame 10; thereby defining the pivot point 44 of the vehicle latch assembly 20. The first engagement surface 35 is formed on an upper edge 37 of the curved portion 50 and is bounded by opposing side surfaces 39 of the structural latch member 30.

Referring to Figures 5, 6 and 7, there is shown a first embodiment of the vehicle seat latch assembly 20 of the present invention. The vehicle seat latch assembly 20 includes a structural latch member 30, as previously described with reference to Figure 3 and a deformable latch member 55 attached to the structural latch member 30. The deformable latch member 55 has a second engagement surface 60 extending beyond the first engagement surface 35 of the structural latch member 30 for primary engagement with a striker 22, as best seen in Figures 1 and 2. The second engagement surface 60 has a greater offset angle derived from a pivot point 44 than an offset angle of the first engagement surface 35 derived from the pivot point 44. The offset angle, as the term is utilized in the specification refers to the angle formed between the center line of the arc 65 comprising the first or second engagement surfaces and the center line of the pivot 44 defined by the slot 47 referenced above. Therefore, the angle between the center line of the arc 65 comprising the second engagement

-4CA 02461778 2004-03-25 surface formed 60 on the deformable latch member 55 has a greater angle than the angle formed by the center line of the arc 70 comprising the first engagement surface 35 both with reference to the center line of the pivot point 44. The relationship of the second engagement surface 60 having a greater offset angle than the first engagement surface 35 allows for a person to more easily release the latch mechanism due to the increased angle when the striker 22 interfaces with the second engagement surface 60 for the primary engagement of the vehicle seat latch assembly 20. In a preferred aspect of the present invention, the second engagement surface 60 has an offset angle ranging from 6.0 to 8.5 degrees, preferably with a 7.5 degree offset angle, while the first engagement surface 35 preferably has an offset angle in the range from 0 to 3 degrees preferably with a 3 degree offset angle.

The deformable latch member 55 preferably comprises a planar body 75 attached to the curve portion 50 of the structural latch member 30 and extending upward beyond the first engagement surface 35 wherein the second engagement surface 60 is defined by a terminal edge 80 of the planar body 75.

In a preferred aspect of the present invention the deformable latch member 55 comprises a resilient flexible plastic and particularly preferred is Hytrel™ sold by Dupont Chemical Corporation.

In use, the deformable latch member 55 that is attached to the structural latch member 30 engages the striker 22 in a first position. This position allows for the easy manipulation of the latch assembly 20 or disengagement of the latch mechanism 20 by a person due to the increased offset angle of the second engagement surface 60 of the deformable latch member 55 engaging the striker 22 in its first position. The deformable latch member 55 collapses in response to a force to move to a second position wherein the deformable latch member 55 moves away from the striker 22 to allow engagement of the structural latch member 35 with the striker 22. The smaller offset angle of the first engagement surface 35 of the structural

-5CA 02461778 2004-03-25 latch member 30 prevents the backing away of the structural latch member 30 from the striker 22 when an increased force or load is applied to the seat. In this manner, the vehicle seat latch assembly 20 incorporating the deformable latch member 55 and the structural latch member 30 provides both an anti-rattle function due to the primary engagement of the striker 22 with the plastic material of the second engagement surface 60; thereby dampening vibrations or rattles. The vehicle seat latch assembly 20 further provides a latch mechanism that is easily manipulated by a user, but remains securely cinched to a striker 22 when an increased force is applied to the seat, due to the lower offset angle 22 of the first engagement surface 35 of the structural latch member 30.

Referring to Figures 6 and 7, there is shown a second embodiment of the vehicle seat latch assembly 20 of the present invention. The latch assembly 20 is similar in structure to the first embodiment, outlined above with the exception that the deformable latch member 35 comprises a pair 85 of planar bodies attached to the curved portion 50 of the structural latch member 30 on opposing side surfaces of the structural latch member and extend, as previously discussed, on the planar bodies 75 upward beyond the first engagement surface 35 wherein the second engagement surface 55 is defined by the terminal edges 80 of both of the planar bodies 75. In all other respects, the second embodiment is similar to that of the previously described first embodiment.

While preferred embodiments are disclosed, a worker in this art would understand that various modifications would come within the scope of the invention. Thus, the following claims should be studied to determine the scope and content of the invention.