Keyboard support mechanism

What is this patent about?

’570 is related to the field of ergonomic computer furniture, specifically adjustable keyboard supports. Traditional mechanisms often utilize parallelogram linkages that reside beneath the keyboard tray, which significantly restricts a user’s legroom when the tray is stowed or lowered. The invention seeks to provide a stable, height-adjustable platform that maintains a consistent tray angle while maximizing the vertical clearance available to the user.

The underlying idea behind ’570 is the replacement of traditional parallel linkages with a non-parallel articulating arm system that relies on a friction-based stopping mechanism. Instead of two fixed-length bars moving in tandem, the invention uses a primary upper arm and a secondary side arm that interacts with a specific curved stopping surface. By utilizing the weight of the keyboard itself to force the side arm against this stopping surface, the mechanism creates a self-locking effect that holds the tray at a desired height and angle without requiring complex manual locking levers.

The claims of ’570 focus on an articulating arm mechanism where the shelf bracket is pivotally connected to a first arm and a second arm in a non-parallel configuration. A critical element is the curved end portion of the second arm, which engages a complementary curved stopping surface on the mounting bracket to restrict translation. The claims also specify that the pivot points on the shelf bracket are positioned above the shelving surface, which allows the linkage to remain clear of the space directly beneath the keyboard, thereby increasing legroom.

In practice, the user adjusts the height by slightly tilting the front of the keyboard shelf upward. This motion pulls the side arm away from the concave stopping surface, disengaging the friction lock and allowing the assembly to pivot freely. Once the user releases the shelf at the desired height, gravity forces the side arm back into the stopping surface. The curvature of this surface is engineered to ensure that as the height changes, the shelf maintains a consistent, ergonomically correct angle relative to the floor.

This approach differs from prior art by eliminating the bulky under-shelf hardware that typically limits knee clearance. By moving the pivot points to a vertical section of the bracket above the tray level and using a friction-based wedge rather than a rigid parallelogram, the invention achieves a slimmer profile. Furthermore, the inclusion of a swivel mechanism and a sliding track allows the entire assembly to be tucked away or rotated, providing a highly adaptable workspace that prioritizes both user comfort and physical clearance.