ON

Representative ergonomic office swivel chair

Configurator

Range 170 ON - Design: wiege

ON is the first swivel chair that enables perfect, three-dimensionally supported sitting thanks to a new type of synchronously supporting 3-D kinematics - Trimension.

In today’s busy office environment we all spend long periods of time in hunched positions at our desks. Bizarrely, despite being bad for our bodies we choose to adopt a lazy posture. What the human body actually requires is frequent and a varied range of movements. Wilkhahn understands this key principal of ergonomics which is why we have developed Trimension® for the ergonomic ON chair. This unique tested feature is a patented technology for three dimensional, synchro-adjusted dynamic seating.

Trimension® doesn’t just encourage forwards, backwards and sideways movements, but the pelvis to rotate too - which is so important for the spine’s stability. Two separately moveable swing plates, just like two thighs, lie at the core of the technology. Minimal shifts in weight are already translated into movement. The position of the pivotal points and the way they work are exactly like knee and hip joints. As a result, the body’s equilibrium remains in perfect balance – no matter what posture it adopts or the way it moves. This new dimension in seating quickly becomes something that’s -taken for granted. Backache is effectively prevented and the metabolism, muscles and joints are stimulated.

ON thus creates significantly greater and more natural range of motion in the lateral tilt and rotation of the pelvis and shoulders.
ON stimulates metabolism, improves spinal elasticity and muscle coordination, and increases activity without tiring the body.
The innovative mechanism with independently movable swivel arms, the three-dimensionally movable flexframe consisting of a torsionally flexible, slim upholstered seat shell and elastic back frame, as well as the backrest covering made of Fiberflex ensure excellent seating comfort.
A wide range of models and combinations leave nothing to be desired in terms of function and design. They ensure seating solutions from a single mold and from a single source.

New model: ON® Casual

The new ON® Casual model range combines the best of two worlds: the particularly cozy comfort of a casual sitting position and the 3D mobility of Trimension®. This is made possible by the concave shape of the seat cushion and the three-dimensional backrest frame with high-tech upholstery. This “embrace” of the body ensures optimum pressure distribution and at the same time encourages more movement.

Available from February 2025

Product information

Frame, swivel arms and casters

Frame

five-star base, optionally made of black through-dyed plastic or die-cast aluminum
frame surfaces: coated (black, black or white textured matte or silver satin), polished or bright chrome-plated
swivel arms made of die-cast aluminum coated (black, black or white textured matte or silver satin), polished or bright chrome-plated
Counter chair with additional height-adjustable foot ring, bright chrome-plated, with lock screw for fixation

Casters

load-dependent braked twin-wheel swivel casters made of black polyamide according to DIN EN 12529
optionally electrically conductive

Gas lift and mechanism

Gas lift

covering of the gas lift by telescopic protection tube made of black or white through-dyed polypropylene

Mechanism

mechanism shell made of die-cast, shot-blasted aluminum, optionally coated in black, white or silver satin finish, with top cover made of black or white through-dyed polypropylene

Seat and backrest

highly elastic, flexibly suspended seat shell
seat upholstery made of black or white through-dyed polypropylene, seat cushion made of polyurethane, covered with the same material as the backrest cover in Fiberflex or fabric
all models optionally with soft padding (with extra cut foam fleece and lateral padding bottoms)
selected models optionally with constant 6° comfort-tilt
elastic backrest frame height-adjustable by 60 mm in six locking positions
for models with management upholstery, the backrest frame is optionally also available with backrest upholstery with additional padding as well as on the front side additionally with laminated cut foam fleece sewn into the cover and side facings, optionally also with leather cover
seat and back interchangeable

Armrests

3D armrests made of black or white through-dyed polyamide
Armrest pads made of black or grey through-dyed polyurethane (TPU), optionally also made of black polyurethane foam, optionally covered with leather
upholstered, leather-covered armrests (optional) on model 175/73 with contrasting colored stitching
armrest covers made of black through-dyed polypropylene. Armrests adjustable in height by 100 mm (eight locking positions), in depth by 40 mm, each swiveling 30° inward and outward

Fabrics and Covers

Accessories and misc.

Misc.

ON swivel, visitor and meeting chairs (without headrest) can optionally also be shipped with the backrest dismantled and packed in cardboard boxes

Technical details

Function

Task chairs with Trimension®, synchronous, three-dimensional kinematics to encourage three-dimensional dynamic sitting. The perfect interaction of the synchro-adjustment mechanism, seat and backrest automatically adapts to any posture the user adopts. The supporting counter pressure is quickly and precisely adjustable in any direction (4.5 rotations max.) for people weighing from 45 to 120 kg. The backrest height is adjustable by up to 60 mm in six lockable positions. The backrest and seat can be locked in the front sitting position. The seating height is precision adjustable between 40 and 52 cm at the touch of a button with a DIN 4550-compliant gas lift. All models are optionally available with seat-depth extension of 40 to 45 cm. (The height of the counter chairs is precision adjustable between 68 and 81 cm). Meeting/visitor chairs with Trimension, on request, available with swivel-mounted column, not height adjustable, alternatively as a four-leg variant or cantilever chair, optionally stackable.

Frame

five-star base, optionally made of black through-dyed plastic or die-cast aluminum, coated (black, black or white with a textured matte finish, or in a silver satin finish), polished or bright chrome-plated. Twin-wheel swivel casters with load-dependent braking, made of black polyamide compliant with DIN EN 12529 as the standard version for carpets; with gray soft polyurethane tire for hard floors. The casters are optionally electrically conductive. Swivel arms made of die-cast aluminum, coated (black or black with a textured matte finish or silver satin finish), polished or bright chrome-plated. Mechanism shell made of die-cast, shot-blasted aluminum, optionally coated in black or with a silver satin finish, with top cover made of black, through-dyed polypropylene. The gas lift is covered by a telescopic protective tube made of black, through-dyed polypropylene.

Counter stool with extra height-adjustable foot ring, bright chrome-plated, with lock screw to affix it and twin-wheel swivel casters with load-dependent braking.

All 24-hour chairs have a die-cast aluminum star base with extra swivel arm supports, with a modified synchro-adjustment mechanism and exceptionally hard-wearing covers from Wilkhahn’s fabric and leather collection. Designed for people weighing up to 120 kg, the models consequently comply with the DIN EN 1335 standard requirements for 24-hour use.

Seat

Highly elastic, flexibly suspended seat shell with seat upholstery panel made of black, through-dyed polypropylene, polyurethane seat cushioning covered in the same material as the backrest cover in Fiberflex, or fabric. The seat is replaceable. All models optionally have seats with soft padding (with extra cut foam and facings at the sides). In models with management grade upholstery (174/71, 175/71, 171/71), seat cushioning also with extra padding and side facings, optionally covered in leather too. Optionally with seat-depth extension from 400 to 450 mm (all types with upholstery).

Model 175/73 with soft padding, as well as color-contrasting double seams and contour stitching. Seat cushioning with side facings. Task chair models 174/7, 175/7, 174/71, 175/71 optionally with a constant 6-degree tilt.

Backrest

Elastic backrest frame, height adjustable by 60 mm in six lockable positions, made of through-dyed, fiberglass-reinforced polyamide, covered with Fiberflex, optionally also with fabric (and extra padding). All models optionally with soft padding (with extra cushion thickness). For models with management grade upholstery, the backrest frame also optionally comes with back cushioning and the front of the backrest also with concealed, cut foam fleece sewn into the cover and with side facings, optionally with a leather cover. All models optionally with soft padding (with extra cut foam). Medium-high and high backrest, high backrest optionally with headrest (height 16 cm), either in the same material as the backrest cover, or covered in leather on the front. The backrest is replaceable. Model 175/73 with soft padding, as well as color-contrasting double seams and contour-defining stitching.

Armrests

3D armrests made of fiberglass-reinforced, black or white through-dyed polyamide. Armrest pads made of black, through-dyed polyurethane (TPU), optionally also made of polyurethane foam and covered in leather if desired. Upholstered, leather-covered armrests (optional) in model 175/73 with color-contrasting stitching. Armrest covers made of black, through-dyed polypropylene. Height of armrests adjustable by 100 mm (eight lockable positions), depth by 40 mm, can be swivelled 30° inwards and outwards in each case.

Standards

The ON task chairs and visitor/meeting chairs comply with the type A or B DIN EN 1335 office-chair, ANSI/BIFMA X5.1 and IGR standards. If required, NPR 1813 models are available.