METHOD AND APPARATUS FOR A LOW-PROFILE SUSPENSION SYSTEM

Abstract

A method and apparatus for a low-profile suspension system, which provides coarse and fine suspension control to an object supported by the low-profile suspension system. Coarse suspension is provided to adaptively control a position of the object through pneumatic support devices. Pneumatic pressure is adaptively increased in the pneumatic support devices to support an increasing weight of the object, while pneumatic pressure is adaptively decreased in the pneumatic support devices to support a decreasing weight of the object. Fine suspension control is provided through rotational actuation of a shock absorbing device through a right-angle gear drive. By rotationally actuating the shock absorbing device, a range of stroke of the shock absorbing device along a vertical direction is minimized. Position equalization control is further provided to maintain a position of the object along an axis that is orthogonal to the coarse and fine suspension axis.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

Various aspects and advantages of the invention will become apparent upon review of the following detailed description and upon reference to the drawings in which:

FIG. 1A illustrates an exemplary mobile electronic equipment rack;

FIG. 1B illustrates an exemplary block diagram of a pneumatically sprung swivel caster mechanism that may be used in the mobile electronic equipment rack of FIG. 1A;

FIG. 1C illustrates an alternate embodiment of a mobile electronic equipment rack;

FIG. 2 illustrates an exploded view of the mobile electronic equipment rack of FIGS. 1A and 1B;

FIG. 3 illustrates illustrated an alternate view of the mobile electronic equipment rack of FIGS. 1A and 1B;

FIG. 4A illustrates an exemplary schematic diagram of a multi-axis suspension system;

FIG. 4B illustrates an exemplary schematic diagram of an alternate, multi-axis suspension system;

FIG. 5 illustrates an exemplary schematic diagram of an alternate, multi-axis suspension system;

FIG. 6A illustrates an exemplary flow diagram of a method of providing coarse suspension control; and

FIG. 6B illustrates an exemplary flow diagram of a method of providing fine suspension control.

Claims

1. A suspension system, comprising: a first suspension device coupled to an object, the first suspension device adapted to maintain a position of the object between a range of distance in a first direction;a second suspension device coupled to the object and programmed to dampen movement of the object between the range of distance, wherein the second suspension device is rotationally actuated to minimize a range of stroke of the second suspension device in the first direction; anda third suspension device coupled to the object and adapted to maintain the object within an equilibrium position along an axis orthogonal to the first direction.

2. The suspension system of claim 1, wherein the first suspension device comprises: a first pneumatic support coupled to a first portion of the object and adapted to pneumatically maintain a position of the first portion of the object between the range of distance in the first direction in response to a first position signal; anda second pneumatic support coupled to a second portion of the object and adapted to pneumatically maintain a position of the second portion of the object between the range of distance in the first direction in response to a second position signal.

3. The suspension system of claim 2, wherein the first pneumatic support comprises: a first compressor coupled to the first pneumatic support and adapted to maintain a pressure of the first pneumatic support to maintain the position of the first portion of the object between the range of distance; anda second compressor coupled to the second pneumatic support and adapted to maintain a pressure of the second pneumatic support to maintain the position of the second portion of the object between the range of distance.

4. The suspension system of claim 1, wherein the second suspension device is statically programmed to dampen movement of the object between the range of distance.

5. The suspension system of claim 4, wherein the second suspension device comprises: a conductive element; anda magnetorheological device displaced within the conductive element and coupled to the object.

6. The suspension system of claim 5, wherein the second suspension device further comprises: a pulse width modulator coupled to the conductive element and adapted to provide a pulse width modulated signal to the conductive element, the conductive element being adapted to produce a variable magnitude magnetic field in response to the pulse width modulated signal;a controller coupled to receive information indicative of a weight of the object and adapted to provide a weight signal in response to the information; anda potentiometer coupled to the pulse width modulator and adapted to provide a programmably static control signal to the pulse width modulator in response to the weight signal, the pulse width modulator being adapted to adjust a duty cycle of the pulse width modulated signal in response to the programmably static control signal.

7. The suspension system of claim 1, wherein the second suspension device is dynamically programmed to dampen movement of the object between the range of distance.

8. The suspension system of claim 7, wherein the second suspension device comprises: a conductive element; anda magnetorheological device displaced within the conductive element and coupled to the object.

9. The suspension system of claim 8, wherein the second suspension device further comprises: a pulse width modulator coupled to the conductive element and adapted to provide a pulse width modulated signal to the conductive element, the conductive element being adapted to produce a variable magnitude magnetic field in response to the pulse width modulated signal;a controller coupled to receive information indicative of a weight of the object and adapted to provide a weight signal in response to the information; andan accelerometer coupled to the pulse width modulator and adapted to provide a dynamic control signal to the pulse width modulator at least in partial response to the weight signal, the pulse width modulator being adapted to adjust a duty cycle of the pulse width modulated signal in response to the dynamic control signal.

10. The suspension system of claim 1, wherein the third suspension device comprises: a plurality of air pistons coupled to the object;wherein a length of each of the plurality of air pistons determines the equilibrium position of the object along an axis orthogonal to the first direction;a plurality of air reservoirs coupled to the plurality of air pistons; andwherein the length of each of the plurality of air pistons is adjusted in response to air pressure within each respective air reservoir and deviations in the length of each of the plurality of air pistons are substantially absorbed by elastic movement of each respective air reservoir.

11. A method of providing suspension, comprising: adaptively maintaining a position of an object between a minimum and a maximum distance in a first direction;rotationally actuating a shock absorbing device to dampen movement of the object between the minimum and the maximum distance, wherein a range of stroke of the shock absorbing device in the first direction is minimized through the rotational actuation; andpneumatically maintaining a position of the object along an axis orthogonal to the first direction.

12. The method of claim 11, wherein adaptively maintaining a position of the object comprises detecting a position of the object between the minimum and maximum distance.

13. The method of claim 12, wherein adaptively maintaining a position of the object further comprises raising the position of the object in response to detecting that the object is below an equilibrium position.

14. The method of claim 13, wherein adaptively maintaining a position of the object further comprises lowering the position of the object in response to detecting that the object is above the equilibrium position.

15. The method of claim 11, wherein rotationally actuating the shock absorbing device comprises: detecting movement of the object;adaptively programming a damper resistance of the shock absorbing device in response to the detected movement;rotating a right-angle gear drive in a second direction in response to an upward movement of the object;rotating the right-angle gear drive in a third direction in response to a downward movement of the object;moving a piston of the shock absorbing device in response to the rotational movement of the right-angle gear drive; andadaptively dampening movement of the piston in response to the adaptively programmed damper resistance.

16. The method of claim 11, wherein rotationally actuating the shock absorbing device comprises: statically programming a damper resistance of the shock absorbing device;rotating a right-angle gear drive in a second direction in response to an upward movement of the object;rotating the right-angle gear drive in a third direction in response to a downward movement of the object;moving a piston of the shock absorbing device in response to the rotational movement of the right-angle gear drive; anddampening movement of the piston in response to the statically programmed damper resistance.

17. The method of claim 11, wherein pneumatically maintaining a position of the object comprises: coupling the first air piston to a first end of the object;coupling the second air piston to a second end of the object;filling a pair of air reservoirs to a nominal air pressure;applying the nominal air pressure from each air reservoir to respective first and second air pistons to establish an equilibrium length of the air pistons; andabsorbing variations in the equilibrium length of the first and second air pistons, wherein a contraction of the length of the first and second air pistons expands elastic walls of the respective air reservoirs and an expansion of the length of the first and second air pistons contracts the elastic walls of the respective air reservoirs.

18. A low-profile shock absorbing device, comprising: a right-angle gear drive having a first member capable of being coupled to an object and a second member rotationally actuated by movement of the first member along a vertical axis;a shock absorbing device having a piston coupled to the second member of the right-angle gear drive, wherein a range of stroke of the piston along the vertical axis is minimized through the rotational actuation of the right-angle gear drive; anda position equalization device including, a plurality of air pistons coupled to the object, wherein a length of each of the plurality of air pistons determines the equilibrium position of the object along an axis orthogonal to the vertical axis; anda plurality of air reservoirs coupled to the plurality of air pistons, wherein the length of each of the plurality of air pistons is adjusted in response to air pressure within each respective air reservoir and deviations in the length of each of the plurality of air pistons is substantially absorbed by elastic movement of each respective air reservoir.

19. The low-profile shock absorbing device of claim 18, wherein the shock absorbing device comprises: a conductive element encapsulating the shock absorbing device;a pulse width modulator coupled to the conductive element and adapted to provide a pulse width modulated signal to the conductive element, the conductive element being adapted to produce a variable magnitude magnetic field in response to the pulse width modulated signal; andan accelerometer coupled to the pulse width modulator and adapted to provide a dynamic control signal to the pulse width modulator in response to detected movement of the object, the pulse width modulator being adapted to adjust a duty cycle of the pulse width modulated signal in response to the dynamic control signal.

20. The low-profile shock absorbing device of claim 18, wherein the shock absorbing device comprises: a conductive element encapsulating the shock absorbing device;a pulse width modulator coupled to the conductive element and adapted to provide a pulse width modulated signal to the conductive element, the conductive element being adapted to produce a variable magnitude magnetic field in response to the pulse width modulated signal; anda potentiometer coupled to the pulse width modulator and adapted to provide a statically programmed control signal to the pulse width modulator, the pulse width modulator being adapted to adjust a duty cycle of the pulse width modulated signal in response to the statically programmed control signal.