Height and tilt adjustable keyboard support

1. A keyboard support for movably supporting a keyboard with respect to a work surface of a workstation comprising:

a) a workstation engaging member adapted to be attached to an underside of the work surface;

b) a keyboard engaging member disposed forwardly of the workstation engaging member for supporting a keyboard including spaced apart sides defining aligned slots and aligned holes;

c) a linkage assembly mechanically coupling and providing relative movement between the workstation engaging member and the keyboard engaging member, the linkage assembly including:

1) an upper support member including one end rotatably mounted to the workstation engaging member and further including an arcuate slot and a hole at an opposite end;

2) a lower support member including one end rotatably mounted to the workstation engaging member and further including a hole at an opposite end;

3) a lower connector passing through the arcuate slot in the upper support member, the aligned slots of the keyboard engaging member, and the hole passing through the lower support member; and

4) an upper connector passing through the aligned holes of the keyboard engaging member and the hole of the upper support member; and

d) a tilt lockout member coupled to an end of the lower connector and including an arm adapted to fit into one of the aligned slots of the keyboard engaging member, the tilt lockout member movable to position the arm in a selected one of a first and a second position, in the first position, the arm being disposed in the one of the aligned slots of the keyboard engaging member on one side of the lower connector and in the second position, the arm being disposed in the one of the aligned slots of the keyboard engaging member on an opposite side of the lower connector, in the first position, pivoting of the keyboard engaging member in a positive tilt angle direction is restricted by the arm and, in the second position, pivoting of the keyboard engaging member in the positive tilt angle direction is not restricted.

2. The keyboard support of claim 1 wherein in the first position of the tilt lockout member, a maximum positive tilt angle of the keyboard engaging member is substantially 0 degrees and in the second position, the maximum positive tilt angle of the keyboard engaging member is substantially 10 degrees.

3. The keyboard support of claim 1 wherein the end of the lower connector that the tilt lockout member is coupled to includes an enlarged head and the tilt lockout member is carried by the connector and bears against the enlarged head.

4. The keyboard support of claim 1 wherein a tilt adjustment knob is threaded onto a threaded end of the lower connector opposite the end of the lower connector that the tilt lockout member is coupled to.

5. A keyboard support for movably supporting a keyboard with respect to a work surface of a workstation comprising:

a) a workstation engaging member adapted to be attached to an underside of the work surface including a clevis having first and second spaced apart substantially vertical sides;

b) a keyboard engaging member disposed forwardly of the workstation engaging member for supporting a keyboard including spaced apart substantially vertical sides defining aligned slots and aligned holes;

c) a linkage assembly mechanically coupling and providing relative movement between the workstation engaging member and the keyboard engaging member, the linkage assembly including:

1) an upper support member including a hole at one end for rotatable mounting to the workstation engaging member clevis;

2) a lower support member including a hole at one end for rotatable mounting to the workstation engaging member clevis;

3) a first connector mounted between the sides of the clevis and passing through the hole of the upper support member;

4) a second connector mounted between the sides of the clevis and passing through the hole of the lower support member; and

5) a third connector affixed to the upper support member; and

d) a spring counterbalance assembly including a first spring wound around the first connector, a first end of the first spring bearing against the third connector and applying a spring torsion force to pivot the upper support member upwardly, a second end of the first spring being insertable into a selected one of a plurality of openings in the first side of the clevis, a magnitude of the spring torsion force dependent on which of the plurality of openings the first spring is inserted into.

6. The keyboard support of claim 5 wherein the first side of the clevis includes three openings, vertically spaced apart, when the second end of the first spring is inserted into the vertically highest opening, the spring torsion force being a low magnitude, when the second end of the first spring is inserted into the vertically middle opening, the spring torsion force being an intermediate magnitude, and when the second end of the first spring is inserted into the vertically lowest opening, the spring torsion force being a high magnitude.

7. The keyboard support of claim 5 wherein the spring counterbalance assembly further includes a second spring wound around the first connector, a first end of the second spring bearing against the third connector and a second end of the second spring fixed with respect to the clevis, the second spring applying a spring torsion force to pivot the upper support arm upwardly.

8. The keyboard support of claim 4 wherein rotation of the tilt adjustment knob with respect to the threaded end of the lower connector in a first direction changes a tilt angle of the keyboard engaging member in the positive tilt angle direction and rotation of the tilt adjustment knob with respect to the threaded end of the lower connector in an opposite, second direction changes the tilt angle of the keyboard engaging member in a negative tilt angle direction.

9. The keyboard support of claim 8 wherein the first direction is a direction of rotation of the tilt adjustment knob that unthreads the tilt adjustment knob from the threaded end of the lower connector, the keyboard engaging member pivoting in the positive tilt angle direction.

10. The keyboard support of claim 8 wherein the second direction is a direction of rotation of the tilt adjustment knob that threads the tilt adjustment knob onto the threaded end of the lower connector, the keyboard engaging member moving in the negative tilt angle direction.

11. The keyboard support of claim 1 wherein the keyboard engaging member pivots about the upper connector.

12. The keyboard support of claim 8 wherein rotation of the tilt lockout member in the first direction permits the arm of the tilt lockout member sufficient clearance with respect to the keyboard engaging member to be moved between the first position and the second position.

13. The keyboard support of claim 4 wherein the tilt lockout member is affixed to the end of the lower connector and rotates with the lower connector to move between the first position and the second position.

14. A keyboard support for movably supporting a keyboard with respect to a work surface of a workstation comprising:

a) a workstation engaging member adapted to be attached to an underside of the work surface;

b) a keyboard engaging member disposed forwardly of the workstation engaging member for supporting a keyboard including spaced apart sides defining aligned slots and aligned holes;

c) a linkage assembly mechanically coupling and providing relative movement between the workstation engaging member and the keyboard engaging member, the linkage assembly including:

1) an upper support member including one end rotatably mounted to the workstation engaging member and further including an arcuate slot and a hole at an opposite end;

2) a lower support member including one end rotatably mounted to the workstation engaging member and further including a hole at an opposite end;

3) a lower connector passing through the arcuate slot in the upper support member, the aligned slots of the keyboard engaging member, and the hole passing through the lower support member; and

4) an upper connector passing through the aligned holes of the keyboard engaging member and the hole of the upper support member; and

d) a tilt lockout member coupled to an end of the lower connector and including an arm adapted to fit into one of the aligned slots of the keyboard engaging member, the tilt lockout member movable to position the arm in a first position wherein the arm is disposed in the one of the aligned slots of the keyboard engaging member on one side of the lower connector, in the first position, pivoting of the keyboard engaging member in a positive tilt angle direction being restricted by the arm.

15. The keyboard support of claim 14 wherein the tilt lockout member is movable to position the arm in a selected one of the first position and a second position, in the first position, the arm being disposed in the one of the aligned slots on the one side of the lower connector and, in the second position, the arm being disposed in the one of the aligned slots on an opposite side of the lower connector, in the first position, pivoting of the keyboard engaging member in the positive tilt angle direction is restricted by the arm and in the second position pivoting of the keyboard engaging member in the positive tilt angle direction is not restricted.

16. The keyboard support of claim 14 wherein the end of the lower connector that the tilt lockout member is coupled to includes an enlarged head and the tilt lockout member is carried by the connector and bears against the enlarged head.

17. The keyboard support of claim 14 wherein a tilt adjustment knob is threaded onto a threaded end of the lower connector opposite the end of the lower connector that the tilt lockout member is coupled to.

18. The keyboard support of claim 17 wherein rotation of the tilt adjustment knob with respect to the threaded end of the lower connector in a first direction changes a tilt angle of the keyboard engaging member in the positive tilt angle direction and rotation of the tilt adjustment knob with respect to the threaded end of the lower connector in an opposite, second direction changes the tilt angle of the keyboard engaging member in a negative tilt angle direction.

19. The keyboard support of claim 18 wherein the first direction is a direction of rotation of the tilt adjustment knob that unthreads the tilt adjustment knob from the threaded end of the lower connector, the keyboard engaging member pivoting in the positive tilt angle direction and further wherein the second direction is a direction of rotation of the tilt adjustment knob that threads the tilt adjustment knob onto the threaded end of the lower connector, the keyboard engaging member pivoting in the negative tilt angle direction.

20. The keyboard support of claim 14 wherein the keyboard engaging member pivots about the upper connector.

21. The keyboard support of claim 17 wherein rotation of the tilt lockout member in the first direction permits the arm of the tilt lockout member sufficient clearance with respect to the keyboard engaging member to be moved between the first position and the second position.