Leaned axis, asynchronous, dual-axle drop hinge and portable information handling system comprising the same

1. A hinge assembly rotationally coupled between a lid and a base of a portable information handling system (IHS), the hinge assembly comprising:

an upper hinge axle coupled to the lid of the portable IHS;

a lower hinge axle coupled to the base of the portable IHS, wherein the lower hinge axle rotates, while the upper hinge axle remains stationary, when the lid is rotated from a closed position to a usage angle of approximately 180°;

a hinge cover encompassing the upper and lower hinge axles;

a fulcrum foot provided on the hinge cover, wherein the fulcrum foot initially contacts a support surface when the lid is rotated to a first usage angle and continues to support the portable IHS on the support surface as the lid is rotated further through a wide range of usage angles;

wherein a rear portion of the base lifts away from the support surface when the lid is rotated substantially beyond the first usage angle; and

wherein the upper and lower hinge axles are offset by an offset angle θ of approximately 10°-20° from a vertical axis to reduce an amount by which the rear portion of the base lifts away from the support surface over the wide range of usage angles.

2. The hinge assembly as recited in claim 1 , wherein the upper hinge axle rotates, while the lower hinge axle remains stationary, when the lid is rotated between approximately 180° and approximately 360°.

3. The hinge assembly as recited in claim 1 , wherein the fulcrum foot remains in contact with the support surface as the lid is rotated through a wide range of usage angles between about 110° and about 180°.

4. The hinge assembly as recited in claim 1 , wherein the fulcrum foot is arranged near an upper edge of the hinge cover and extends across a length of the hinge cover.

5. The hinge assembly as recited in claim 1 , wherein the fulcrum foot extends across a width of the hinge cover and wraps around an upper edge of the hinge cover.

6. The hinge assembly as recited in claim 1 , wherein a portion of the fulcrum foot is recessed within a mating groove formed within the hinge cover.

7. The hinge assembly as recited in claim 1 , wherein the fulcrum foot comprises an elastomeric material.

8. The hinge assembly as recited in claim 1 , further comprising:

a lower torque engine comprising the lower hinge axle and a lower variable torque mechanism that adjusts an amount of friction applied to the lower hinge axle as the lid is rotated from about 0° to about 180°;

an upper torque engine comprising the upper hinge axle and an upper torque mechanism that applies friction to the upper hinge axle as the lid is rotated from about 180° to about 360°;

a switching mechanism coupled to switch rotation from the lower torque engine to the upper torque engine when the lid is rotated beyond approximately 180°;

a lower axle mounting feature coupled between the lower hinge axle and a lower mounting bracket of the hinge assembly; and

an upper axle mounting feature coupled between the upper hinge axle and an upper mounting bracket of the hinge assembly.

9. The hinge assembly as recited in claim 8 , wherein the upper and lower torque engines, the switching mechanism and the upper and lower axle mounting features are each shifted by the offset angle θ.

10. A portable information handling system (IHS) configured to rest upon a support surface, the portable IHS comprising:

a lid including a display screen;

a base including a main chassis portion; and

a hinge assembly rotationally coupled between the lid and the base, wherein the hinge assembly comprises:

an upper hinge axle coupled to the lid;

a lower hinge axle coupled to the base, wherein the lower hinge axle rotates, while the upper hinge axle remains stationary, when the lid is rotated from a closed position to a usage angle of approximately 180°;

a hinge cover encompassing the upper and lower hinge axles, wherein the hinge cover contacts the support surface when the lid is rotated to a first usage angle between approximately 100° and 120°; and

wherein further rotation of the lid beyond the first usage angle causes a rear portion of the base to lift away from the support surface and conceal an increasing greater portion of a lower bezel surrounding the display screen.

11. The portable information handling system as recited in claim 10 , wherein the upper hinge axle rotates, while the lower hinge axle remains stationary, when the lid is rotated between approximately 180° and approximately 360°.

12. The portable information handling system as recited in claim 10 , wherein the upper and lower hinge axles are offset by an offset angle θ of approximately 10°-20° from a vertical axis to reduce an amount by which the rear portion of the base lifts away from the support surface when the lid is rotated beyond the first usage angle.

13. The portable information handling system as recited in claim 10 , wherein the hinge assembly further comprises:

a lower torque engine comprising the lower hinge axle and a lower variable torque mechanism that adjusts an amount of friction applied to the lower hinge axle as the lid is rotated from about 0° to about 180°;

an upper torque engine comprising the upper hinge axle and an upper torque mechanism that applies friction to the upper hinge axle as the lid is rotated from about 180° to about 360°;

a switching mechanism coupled to switch rotation from the lower torque engine to the upper torque engine when the lid is rotated beyond approximately 180°;

a lower axle mounting feature coupled between the lower hinge axle and a lower mounting bracket of the hinge assembly; and

an upper axle mounting feature coupled between the upper hinge axle and an upper mounting bracket of the hinge assembly.

14. The portable information handling system as recited in claim 13 , wherein the upper and lower torque engines, the switching mechanism and the upper and lower axle mounting features are each shifted by an offset angle θ of approximately 10°-20° from a vertical axis to reduce an amount by which the rear portion of the base lifts away from the support surface when the lid is rotated beyond the first usage angle.

15. The portable information handling system as recited in claim 10 , wherein the hinge cover comprises a fulcrum foot, and wherein the fulcrum foot initially contacts the support surface when the lid is rotated to the first usage angle and continues to support the portable IHS on the support surface as the lid is rotated further through a wide range of usage angles.

16. The portable information handling system as recited in claim 15 , wherein the fulcrum foot remains in contact with the support surface as the lid is rotated through a wide range of usage angles between about 110° and about 180°.

17. The portable information handling system as recited in claim 15 , wherein the fulcrum foot is arranged near an upper edge of the hinge cover and extends across a length of the hinge cover.

18. The portable information handling system as recited in claim 15 , wherein the fulcrum foot extends across a width of the hinge cover and wraps around an upper edge of the hinge cover.

19. The portable information handling system as recited in claim 15 , wherein a portion of the fulcrum foot is recessed within a mating groove formed within the hinge cover.

20. The portable information handling system as recited in claim 15 , wherein the fulcrum foot comprises an elastomeric material.