IN

Function
An office task chair with Trimension®, integrated synchronously supporting 3D kinematics which allows the right-hand and left-hand half of the chair to be tilted in any direction via two flexible swing swivel arms. The goal is to encourage the natural range of motion the pelvis is capable of which includes flexing, extending and moving it sideways to rotating it. The combination of the 3D synchronous adjustment mechanism with a highly elastic seat and back guarantees the chair adapts automatically to any movement made or posture adopted by the person sitting on it. As a result, the body is supported in any position and maintains its center of gravity. The counter pressure, which provides support in any direction moved in, is precision adjustable for people weighing from 45 to 140 kg by changing the elasticity. The backrest has optional, height-adjustable lumbar support (in six lockable positions of up to 60 mm). The backrest and seat can locked in a neutral sitting position, the 3D forward tilt of 5° can be activated at the touch of a button in order to harness the maximum range of motion. The seating height can be precisely adjusted at the touch of a button between 400 mm and 520 mm with a DIN 4550-compliant gas lift. Seat depth: 430 mm, optionally with seat depth that can be adjusted while sitting down in 4 lockable positions of 400 to 450 mm. (The height of the elevated seating position (ESP) models is precision adjustable from between 460 mm and 640 mm and the counter chairs between 650 mm and 780 mm).

Frame
Five-star base made of black through-dyed, fiberglass-reinforced polyamide, optionally of die-cast aluminum, coated, polished or highluster polished. Twin-wheel swivel casters with load-dependent braking, made of black DIN EN 12529-compliant polypropylene as the standard version for carpets, optionally with gray tire made of polyurethane for hard flooring. Casters optionally electrically conductive. Gas lift covered by telescopic protective tube made of black throughdyed polypropylene. Mechanism shell made of die-cast aluminum, coated matte black with black through-dyed polypropylene bellows and thermoplastic elastomer to accommodate the flexibly mounted central spring, knob to adjust the counter pressure made of polyamide (for people weighing from 45 to 140 kg).  Each chair has two swivel arms which can move independently of one another, made of die-cast aluminum, coated, matte polished or highluster polished, with protective caps made of polypropylene. Counter stool star base from the ON 170 range, with additional height-adjustable, bright chrome-plated foot ring, with lock screw to affix it and twinwheel swivel casters with load-dependent braking. 24-hour chairs always with die-cast aluminum star base, with extra swivel arm supports and high-performance covers. Designed for people weighing up to 150 kg, the models also comply with the British Standard.

Seat-backrest element
Unitary, highly elastic, and flexibly suspended seat-backrest element made of high-performance polyamide. Seat shell made of black or white through-dyed polyamide with polypropylene seat upholstery panel. Ergonomic polyurethane seat cushioning with CFC-free foam, covered in Racer, optionally also with Formstrick (form-fit knit) that offers different support zones, in the same material as the backrest cover. Or with fabric covers from the Wilkhahn fabric collection, then with facings sewn-in and deep top stitching lengthwise to create contours as well as side facings in the same material and color. When optional soft padding is chosen, more defined edges because of the higher quantity of foam and all fabric covers with upholstered facings at the side are in the same material and color. Form-fit knit is not available in combination with soft padding. Optional seat-depth extension, which can be adjusted while sitting in 4 lockable positions from 40 to 45 cm. Then standard and soft padding with side facings in Racer, color-matched when the fabric cover is Racer, in black (37/99) for all other fabrics. Seat upholstery panel, cushioning and covers are replaceable. The back section is the frame, optionally with Hytrel® lumbar support (which is retrofittable at any time), comes in black or white to match the seat shell and is adjustable in height by 60 mm in six lockable positions. The back is covered in Formstrick (form-fit knit) which includes different elasticity for flexible and supporting zones, optional two-ply cover made of Formstrick with integrated upholstery foam with different support zones. Colors from the Wilkhahn sample card. Optional headrest made of through-dyed polyamide, in black or white to match the color of the frame, height can be adjusted by 60 mm in 6 lockable positions, with a 125-degree tilt function, which allows the depth to be adjusted by 50 mm. Upholstered, covered in 37 Racer or Evida 58 fabric, color-matched with the backrest cover, or in black. Headrest not possible when the chair has a clothes hanger The headrest can be retrofitted on request.

Armrests
Armrests made of fiberglass-reinforced, black through-dyed polyamide. 1D armrests whose height is adjustable in 10 lockable positions by 100 mm, in the case of 3D armrests the armrest pads can also be swiveled 50 mm in depth and by 25 degrees inward and outward, in the case of 4D armrests, each can also be adjusted in width by 25 mm. Armrest pads made of black through-dyed polypropylene, optionally of polyurethane foam. Also optionally without armrests.

Standards
The IN task chairs comply with the type A DIN EN 1335 office-chair, ANSI/BIFMA X5.1 and IGR standards.