Convertible assemblies for vehicles

1. A convertible top for a vehicle having longitudinal vehicle frame members on both vehicle sides, comprising:

a convertible top assembly having a link arrangement pivotally mounted on each longitudinal frame member,

each link arrangement having a forward assembly pivotally mounted to an aft assembly, the aft assembly pivotally mounted to the longitudinal vehicle frame members;

each forward assembly having a forward base bar pivotally mounted to a forward second bar to permit movement of a portion of the convertible top from a closed position to a first retracted position, the forward second bar being configured to fold over the forward base bar;

each aft assembly having a first pivotal mount to the forward base bar and a second pivotal mount to the longitudinal vehicle frame members, wherein the first and second pivotal mounts permit movement of the link arrangements from the first retracted position toward a lowered storage position;

wherein the first pivotal mount and the second pivotal mount each comprise joint arrangements to couple the forward and aft assemblies to the longitudinal vehicle frame members; and

wherein each forward assembly includes eight bars pivotally connected by ten pivot points.

2. The convertible top of claim 1 , wherein the link arrangements are connected by at least one tensioning bow.

3. The convertible top of claim 1 , wherein the forward assembly base bar is stationary during the movement of the convertible top from the closed position toward the first retracted position; and

wherein the link arrangements controllably rotate from the first retracted position to the lowered storage position without extending beyond a vertical plane passing through a rear portion of the vehicle.

4. The convertible top of claim 3 , wherein the forward assembly base bar is configured to travel up to a five degree variation from a horizontal position while the link arrangements controllably rotate from the first retracted position to the lowered storage position.

5. The convertible top of claim 2 , further comprising a floating tensioning bow disposed between a forward assembly tensioning bow and an aft end of the convertible top.

6. A convertible top for a vehicle having longitudinal vehicle frame members on both vehicle sides, comprising:

a convertible top assembly having a link arrangement pivotally mounted on each longitudinal frame member,

each link arrangement having a forward assembly pivotally mounted to an aft assembly, the aft assembly pivotally mounted to the longitudinal vehicle frame members;

each forward assembly having a forward base bar pivotally mounted to a forward second bar to permit movement of a portion of the convertible top from a closed position to a first retracted position, the forward second bar being configured to fold over the forward base bar;

each aft assembly having a first pivotal mount to the forward base bar and a second pivotal mount to the longitudinal vehicle frame members, wherein the first and second pivotal mounts permit movement of the link arrangements from the first retracted position toward a lowered storage position;

wherein the first pivotal mount and the second pivotal mount each comprise joint arrangements to couple the forward and aft assemblies to the longitudinal vehicle frame members; and

wherein the joint arrangements of the first and second pivotal mounts of the aft assembly each have first and second aft bars between the first pivotal mount and the second pivotal mount coupled to three linked control bars and seven pivot points.

7. The convertible top of claim 1 , wherein the pivot points are configured so that four of the bars are substantially parallel to each other and four bars are substantially parallel to each other during the movement of the convertible top from the closed position toward the first retracted position.

8. The convertible top of claim 1 , wherein each forward assembly is configured to pivot at least 160 degrees during the movement of the convertible top from the closed position toward the first retracted position.

9. The convertible top of claim 1 , wherein each of the forward base bars includes a distal end including a pivot point removably attached to a forward edge of a vehicle roof opening, wherein the distal end of each of the forward base bars is connected by a forward connector.

10. A convertible top for a vehicle having longitudinal vehicle frame members on both vehicle sides, comprising:

a convertible top assembly having a link arrangement pivotally mounted on each longitudinal frame member;

each link arrangement having a forward assembly pivotally mounted to an aft assembly, the aft assembly pivotally mounted to the longitudinal vehicle frame members;

each forward assembly having a forward base bar pivotally mounted to a forward second bar to permit movement of a portion of the convertible top from a closed position to a first retracted position, the forward second bar being configured to fold over the forward base bar;

each aft assembly having a first pivotal mount to the forward base bar and a second pivotal mount to the longitudinal vehicle frame members, wherein the first and second pivotal mounts permit movement of the link arrangements from the first retracted position toward a lowered storage position;

wherein the first pivotal mount and the second pivotal mount each comprise joint arrangements to couple the forward and aft assemblies to the longitudinal vehicle frame members; and

wherein the forward assembly further comprises a plurality of transverse tensioning bows, wherein a distance between each of the plurality of transverse tensioning bows of the forward assembly in the first retracted position is configured according to a formula of (N (A . . . D) /2) −K, where N is a distance between a pair of the transverse tensioning bows in the closed position and K is a constant.

11. The convertible top of claim 10 , wherein K is 8 to 14 percent of the value of N.

12. The convertible top of claim 10 , wherein K is a rising constant that increases in an aft-ward longitudinal direction of the vehicle.

13. The convertible top of claim 5 , wherein the aft end of the convertible top further comprises a hatch bow pivotally mounted to and adjacent to an aft rear sill of the vehicle.

14. A method of opening a convertible top for a vehicle having longitudinal vehicle frame members on two opposite sides of the vehicle, a link arrangement pivotally mounted on each of the longitudinal frame members, each link arrangement having a forward assembly pivotally mounted to an aft assembly, the aft assembly pivotally mounted to the longitudinal vehicle frame members; each forward assembly having a forward base bar pivotally mounted to a forward second bar, each aft assembly having a first pivotal mount to the forward base bar and a second pivotal mount to the longitudinal vehicle frame members, and wherein the first pivotal mount and second pivotal mount each comprise joint arrangements to couple the forward and aft assemblies to respective longitudinal vehicle frame members, the method comprising:

folding the forward second bar over the forward base bar to adjust a portion of the convertible top between a closed position to a first retracted position;

retracting the link arrangements from the first retracted position toward a lowered storage position; and

raising a hatch bow pivotally mounted to and adjacent to an aft rear sill of the vehicle.

15. The method of claim 14 , further comprising moving at least one bar of the forward assembly by at least 160 degrees during the retracting of the link arrangements from the closed position toward the first retracted position.

16. A convertible assembly for a vehicle having a soft top roof, a forward end, and an aft end, the convertible assembly comprising:

a forward roof assembly and an aft roof assembly pivotably attached to opposite longitudinal vehicle frame members;

the forward roof assembly movable between a closed position which covers at least a portion of an interior of the vehicle and a retracted position which exposes at least a portion of the interior of the vehicle;

the forward roof assembly including a pair of reciprocal pivoting armatures extending longitudinally along at least a portion of the longitudinal vehicle frame members, the armatures connected by a plurality of transverse tensioning bows, at least a first bar of the forward roof assembly having an extended position and attachable to a portion of the vehicle when in the extended position;

the aft roof assembly pivotably attached to the forward roof assembly at a forward end of the aft roof assembly and pivotably attached to the longitudinal frame members at an aft end of the aft roof assembly, the aft roof assembly movable between a closed position which covers at least a portion of the interior of the vehicle and a retracted position which exposes the interior of the vehicle;

the aft roof assembly including a pair of reciprocal pivoting armatures extending longitudinally along a length of a portion of at least a portion of the longitudinal vehicle frame members; and

wherein a distance between each of the plurality of transverse tensioning bows of the forward assembly in the first retracted position is configured according to a formula of (N (A . . . D) /2) −K, where N is a distance between a pair of the transverse tensioning bows in the closed position and K is a constant.

17. The convertible assembly of claim 16 , wherein the forward roof assembly is configured to pivot at least 160 degrees during the movement of the forward roof assembly from the closed position toward the first retracted position.