Adjustable desk platform

1. An adjustable desk platform comprising:

an upper platform defining a substantially planar work surface;

a base located beneath the upper platform, the base defining a bottom that is adapted to sit on an existing desk;

first and second sets of arms coupling the upper platform to the base, wherein the first and second sets of arms are adapted for movement of the upper platform substantially in parallel with the base between a raised position and a lowered position;

a reinforcement member extending between the first set of arms and the second set of arms;

a keyboard tray suspended below the upper platform, wherein the surface area of the keyboard tray is less than the surface area of the upper platform, and wherein at least a portion of the keyboard tray is located laterally between side portions of the base when the upper platform is in the lowered position; and

a first locking mechanism adapted to releasably lock the upper platform in the raised position, and in at least one intermediate position between the raised position and the lowered position, the first locking mechanism comprising:

a first handle movably connected to an underside of the upper platform, the first handle user-operable to unlock the first locking mechanism to permit movement of the first set of arms,

wherein the first locking mechanism is biased into a locked position to immobilize the first set of arms.

2. The adjustable desk platform of claim 1 , further comprising:

a second locking mechanism comprising a second handle movably connected to an underside of the upper platform, the second handle user-operable to unlock the second locking mechanism to permit movement of the second set of arms.

3. The adjustable desk platform of claim 1 , further comprising:

a first mounting bracket extending under the upper platform, wherein the first set of arms is connected to the first mounting bracket; and

a second mounting bracket extending under the upper platform, wherein the second set of arms is connected to the second mounting bracket.

4. The adjustable desk platform of claim 1 , wherein the keyboard tray is generally T-shaped.

5. The adjustable desk platform of claim 1 , wherein the first locking mechanism further comprises a first linkage extending between the first handle and a first member, the first member being biased to a locked position.

6. An adjustable desk platform comprising:

an upper platform defining a substantially planar work surface, and a lower surface opposite the work surface;

first and second mounting brackets extending below the upper platform, the first and second mounting brackets laterally spaced apart from one another;

a base located beneath the upper platform, the base defining a bottom that is adapted to sit on an existing desk;

first and second sets of arms connecting the base to the first and second mounting brackets, the first and second sets of arms adapted to move the upper platform substantially in parallel with the base between a raised position and a lowered position;

a first handle movably connected to the lower surface of the upper platform, the first handle user-operable to unlock the first set of arms to permit movement of the upper platform between the raised and the lowered positions;

and

a keyboard tray suspended below the upper platform, wherein at least a portion of the keyboard tray is located laterally between side portions of the base when the upper platform is in the lowered position.

7. The adjustable desk platform of claim 6 , further comprising:

a first bracket extending between the keyboard tray and the upper platform.

8. The adjustable desk platform of claim 6 , further comprising a first linkage extending between the first handle and a first member, the first member being biased to a locked position.

9. An adjustable desk platform comprising:

an upper platform defining a substantially planar work surface, and a lower surface opposite the work surface;

first and second mounting brackets extending below the lower surface of the upper platform, the first and second mounting brackets laterally spaced apart from one another;

a base located beneath the upper platform, the base having a bottom that is adapted to sit on an existing desk;

first and second sets of arms connecting the base to the first and second mounting brackets, respectively, the first and second sets of arms adapted to move the upper platform substantially in parallel with the base between a raised position and a lowered position;

a first locking mechanism associated with the first set of arms and adapted to releasably lock the first set of arms in position with respect to the first mounting bracket, the first locking mechanism comprising a first handle movably connected to the lower surface of the upper platform, the first handle user-operable to unlock the first set of arms; and

a keyboard tray suspended below the upper platform, wherein at least a portion of the keyboard tray is located laterally between side portions of the base when the upper platform is in the lowered position.

10. The adjustable desk platform of claim 9 , further comprising a second locking mechanism associated with the second set of arms and adapted to releasably lock the first set of arms in position with respect to the second mounting bracket.

11. An adjustable desk platform comprising:

an upper platform defining a substantially planar work surface;

a base located beneath the upper platform, the base defining a bottom that is adapted to sit on an existing desk;

first and second sets of arms coupling the upper platform to the base, wherein the first and second sets of arms are adapted for movement of the upper platform substantially in parallel with the base between a raised position and a lowered position;

a first mounting bracket extending below the upper platform, wherein the first set of arms is connected to the first mounting bracket;

a second mounting bracket extending below the upper platform, wherein the second set of arms is connected to the second mounting bracket;

a reinforcement member extending between the first set of arms and the second set of arms;

a keyboard tray suspended below the upper platform, wherein the surface area of the keyboard tray is less than the surface area of the upper platform, and wherein at least a portion of the keyboard tray is located laterally between side portions of the base when the upper platform is in the lowered position;

a locking mechanism adapted to retain the upper platform in the raised position and in at least one intermediate position between the raised position and the lowered position, the locking mechanism comprising:

a first handle movably connected to an underside of the upper platform, the first handle user-operable to permit movement of the upper platform with respect to the base; and

a second handle movably connected to an underside of the upper platform, the second handle user-operable to permit movement of the upper platform with respect to the base;

wherein the upper platform moves laterally with respect to the base when moved from the lowered position to the raised position.

12. The adjustable desk platform of claim 11 , wherein the keyboard tray is adapted to pivot with respect to the upper platform.

13. An adjustable desk platform comprising:

an upper platform defining a work surface;

a base located beneath the upper platform, the base defining a bottom that is adapted to sit on an existing desk;

first and second sets of arms coupling the upper platform to the base, wherein the first and second sets of arms are adapted for movement of the upper platform substantially in parallel with the base between a raised position and a lowered position;

a locking mechanism adapted to retain the upper platform in the raised position and in at least one intermediate position between the raised position and the lowered position, the locking mechanism including first and second handles movably connected to the upper platform, the first and second handles user-operable to permit movement of the upper platform with respect to the base; and

a keyboard tray suspended below the upper platform, wherein the surface area of the keyboard tray is less than the surface area of the upper platform, and wherein at least a portion of the keyboard tray is located laterally between side portions of the base when the upper platform is in the lowered position.

14. The adjustable desk platform of claim 13 , further comprising:

a first mounting bracket extending below the upper platform, wherein the first set of arms is connected to the first mounting bracket; and

a second mounting bracket extending below the upper platform, wherein the second set of arms is connected to the second mounting bracket.

15. The adjustable desk platform of claim 13 , further comprising a reinforcement member extending between the first set of arms and the second set of arms.

16. An adjustable desk platform comprising:

an upper platform defining a work surface and a lower surface opposite the work surface;

a base located beneath the upper platform, the base defining a bottom that is adapted to sit on an existing desk;

first and second sets of arms coupling the upper platform to the base, wherein the first and second sets of arms are adapted for movement of the upper platform substantially in parallel with the base between a raised position and a lowered position;

a first locking mechanism adapted to releasably lock the first set of arms in position with respect to the upper platform, the first locking mechanism including a first handle located underneath the upper platform, the first handle including a first end pivotally connected to the lower surface of the upper platform, and a second end opposite the first end; and

a keyboard tray suspended below the upper platform, wherein at least a portion of the keyboard tray is located laterally between side portions of the base when the upper platform is in the lowered position;

wherein the second end of the first handle is pivotable by a user about the first end of the first handle toward the lower surface of the upper platform to unlock the first locking mechanism to permit movement of the first set of arms with respect to the upper platform, and

wherein the first locking mechanism is biased into a locked position to immobilize the first set of arms.

17. The adjustable desk platform of claim 16 , wherein:

the upper platform includes first and second lateral ends; and

the first handle is located between the first set of arms and the first lateral end of the upper platform.

18. The adjustable desk platform of claim 16 , further comprising:

a second locking mechanism adapted to releasably lock the second set of arms in position with respect to the upper platform, the second locking mechanism including a second handle located underneath the upper platform, the second handle including a first end pivotally connected to the lower surface of the upper platform, and a second end opposite the first end;

wherein the second end of the second handle is pivotable by a user about the first end of the second handle toward the lower surface of the upper platform to unlock the second locking mechanism to permit movement of the second set of arms with respect to the upper platform, and

wherein the second locking mechanism is biased into a locked position to immobilize the second set of arms.

19. The adjustable desk platform of claim 18 , wherein:

the upper platform includes first and second lateral ends;

the first handle is located between the first set of arms and the first lateral end of the upper platform; and

the second handle is located between the second set of arms and the second lateral end of the upper platform.

20. An adjustable desk platform comprising:

an upper platform defining a work surface and a lower surface opposite the work surface;

a base located beneath the upper platform, the base defining a bottom that is adapted to sit on an existing desk;

first and second sets of arms coupling the upper platform to the base, wherein the first and second sets of arms are adapted for movement of the upper platform substantially in parallel with the base between a raised position and a lowered position;

a keyboard tray suspended below the upper platform, wherein at least a portion of the keyboard tray is located laterally between side portions of the base when the upper platform is in the lowered position;

a first handle located below the upper platform and user-operable to move between a locked position to immobilize the first set of arms relative to the upper platform and an unlocked position to permit movement of the first set of arms relative to the upper platform,

wherein the first handle is located between the first set of arms and a first edge of the upper platform and is pivotally connected to the lower surface of the upper platform, wherein the first handle is pivotable toward the lower surface of the upper platform by a user having a thumb from a first hand located on the work surface and one or more fingers from the first hand located on the first handle;

a second handle located below the upper platform and user-operable to move between a locked position to immobilize the second set of arms relative to the upper platform and an unlocked position to permit movement of the second set of arms relative to the upper platform,

wherein the second handle is located between the second set of arms and a second edge of the upper platform and is pivotally connected to the lower surface of the upper platform, wherein the second handle is pivotable toward the lower surface of the upper platform by a user having a thumb from a second hand located on the work surface and one or more fingers from the second hand located on the second handle;

wherein the first and second edges are located at opposite sides of the upper platform.

21. The adjustable desk platform of claim 20 , wherein the first and second handles pivot away from each other.

22. The adjustable desk platform of claim 20 , wherein the first and second handles are spaced laterally from each other.