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Momentum Arm Sit-Stand Length describes a Knape and Vogt sit-stand keyboard arm designed to support both seated and standing positions, so users can work at one station while changing posture without moving equipment. The design is described as providing better ergonomic support in both positions, which helps users stay closer to a neutral reach zone during long shifts. The arm moves the user closer to the work surface, which reduces overreaching and helps maintain more controlled hand positioning over the keyboard. An increased height range, from 8-5/16 inches above the track to 5-7/8 inches below the track, lets installers set up workstations that accommodate a wide range of user heights and desk configurations. This sit-stand arm fits into multimedia and workspace component layouts where consistent access to the keyboard position is critical.
This sit-stand keyboard arm from Knape and Vogt is built around a track-based installation, and the stated height range of 8-5/16 inches above the track to 5-7/8 inches below the track gives installers clear vertical parameters when locating that track under a work surface. The enhanced Lift-N-Lock braking mechanism lets the height be set without tools, so adjustments can be made during commissioning or later moves without dismantling the arm. A soft-touch knob controls tilt adjustment, so the keyboard angle can be changed on the spot to match user preference while maintaining the same mounting position. The positive tilt lockout option can be engaged when a facility wants to standardize a single tilt angle across multiple stations.
This 21-3/4 sit-stand arm is categorized as a keyboard arm within multimedia and workspace components, so it fits projects where keyboard access must track closely with monitors and work surfaces. The design supports both seated and standing positions, which suits shared stations where different operators use the same desk across shifts. The ability to move the user closer to the work surface helps in control rooms, service counters, or technical benches where equipment depth limits knee space and reach. The 360 degree swivel capability lets the keyboard be pivoted toward different sides of a workstation, supporting layouts where a single user alternates between typing, writing, or using nearby equipment around the same surface. Availability with glide or low-profile ball bearing storage tracks gives furniture builders flexibility when they decide how far the arm should travel under the work surface when stored.
The enhanced, patented Lift-N-Lock braking mechanism on this ergonomic keyboard arm locks the arm at the chosen height, which supports repeatable positioning for each user without requiring tools after initial setup. The soft-touch tilt adjustment knob provides a clear control point, so a user can set a preferred keyboard angle and return to it easily. The positive tilt lockout option helps when a standard angle is defined for a department or process and needs to remain consistent. A dual swivel option allows the arm to articulate through multiple pivot points, giving more flexibility to reach the same effective keyboard position even when furniture geometry changes between installations. Wherever possible, recycled materials are used to manufacture components, and the product is designed for disassembly and 100 percent recyclability, which matters on long-running programs where end-of-life handling is part of the job specification.
The Knape and Vogt 8478D21 sit-stand arm is designed to support a keyboard in both seated and standing positions, so users can shift posture while keeping the same workstation.
The sit-stand arm provides a height range from 8-5/16 inches above the track to 5-7/8 inches below the track, covering typical seated and standing keyboard positions at a fixed work surface.
The Lift-N-Lock braking mechanism holds the arm at the chosen height, so users can reposition the keyboard without tools and keep a consistent working level once set.
The sit-stand arm uses a soft-touch knob for tilt adjustment, and it offers a positive tilt lockout option when a fixed angle is preferred for standardized setups.
The 360 degree swivel allows the keyboard arm to rotate fully, so users can swing the keyboard into position for typing and away again to clear space for other tasks.
The sit-stand arm is available with either glide tracks or low-profile ball bearing storage tracks, so planners can match slide action and profile to their furniture design.
The Knape and Vogt Momentum Arm Sit-Stand Length 8478D21 offers an increased height range, 360 degree swivel, and tilt adjustment with Lift-N-Lock braking, so one arm can serve varied users around a single work surface. Dual swivel and track choices give furniture builders and integrators layout flexibility when fitting the arm into multimedia stations, technical benches, or office workstations. For woodworking and workspace projects sourced through Wurth Baer Supply, this sit-stand arm provides a defined set of motion and ergonomic features that can be matched to project requirements.
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