Convertible sit-to-stand desk

What is this patent about?

’148 is related to the field of convertible furniture, specifically sit-to-stand desk converters designed to sit atop an existing work surface. These devices address the ergonomic need for users to transition between sitting and standing positions by providing a height-adjustable platform that can be manually raised or lowered while maintaining a stable work area.

The underlying idea behind ’148 is a scissor-style linkage that utilizes a specific arrangement of fixed and sliding pivot points to ensure the desktop remains stable and level throughout its vertical travel. By cross-linking two frame members and alternating which ends are anchored and which are allowed to slide along tracks in the base and desktop, the invention creates a controlled, synchronized movement that collapses into a nearly flat profile when lowered.

The claims of ’148 focus on a manual locking mechanism integrated into the upper sliding assembly, featuring a rotating pivot bar that runs parallel to the desktop’s guide track. This bar is equipped with a series of locking recesses that capture a tab on the moving part of the frame, allowing the user to secure the desk at various discrete heights by simply rotating the bar via a spring-loaded handle.

In practice, the desk operates through a combination of user force and a gas spring assist that offsets the weight of the desktop and equipment. When the user pulls the handle, the pivot bar rotates to disengage the locking tab from its current recess, freeing the upper end of the frame to slide along its track. This mechanical release allows the scissor legs to either fold flat for sitting or extend into a transverse X-shape for standing.

This approach differs from prior solutions by consolidating the locking and adjustment hardware into a streamlined, low-profile pivot bar system. Unlike traditional pin-and-hole or friction-based locks that can be cumbersome or prone to slipping, the notched flange on the rotating bar provides a positive mechanical engagement across the entire range of motion, ensuring the desk remains rigid under load while allowing for a thin, compact footprint when fully collapsed.