open up

Swivel chair

Motivation comes from being able to lean back and relax during a hard working day. Switch off and free up your thoughts – no problem when you have open up in the office. Whenever you need to clear your head. Sitting, standing or even when lying down: this elegant office chair with integrated “Similar” and dorsokinetic mechanisms makes any position possible. Freedom of movement releases the mind. The perfect inspiration for efficient working.

Design: Mathias Seiler (Sedus Design Team)
Design Edition modern classic: Rüdiger Schaack (Sedus Design Team)

open up – The dynamic office revolution

Sedus open up has heralded the arrival of the regenerative power nap in the office and, in combination with the unique work assistant, makes it possible to work sitting down, standing up and lying down. This unusual swivel chair features a reclining angle of up to 45 degrees; a value which, when combined with a dorsokinetically suspended backrest, is achieved by no other chair on the market. The flexible backrest connection ideally supports the back during all rotating and lateral movements.



Craftsmanship that gets the heart beating faster

How can a superb design be improved on even more? The answer: with real craftsmanship. Sedus open up modern classic shows this in a way that can be experienced with all the senses. One example is the soft, full-grain aniline leather with its very special feel. The natural characteristics of the leather are retained and have an especially high-quality look. At the same time, inviting upholstery offers additional comfort that the stepped look of the cushion effectively underlines. Each open up modern classic is made by hand and bears the signature of the Sedus employee who made it. Made in Germany.



BackrestAdjustable backrest pressure
Dorsokinetic backrest
Adjustable lumbar support
Different cover for backrest upholstery (depending on version)
Backrest with flat upholstery pad
ArmrestsPlastic armrestsWithout armrests
Standard armrests with leather covers
3-D armrests with soft-touch covers
3-D armrests with gel-pad covers
3-D armrests with leather covers
Seat mechanism“Similar” mechanismSimilar mechanism with tension control and forward tilt 4°
Large seat (30 mm larger in seat depth and width)
Seat height-adjustmentGaslift with mechanical depth-springing


BaseAluminium base, powder-coated blackAluminium base, powder-coated white aluminium
Aluminium base, polished

Model colour
(mechanism and plastic parts)



SpecificationHard castors for soft floorsSoft castors for hard floors
BackrestBackrest with leather upholstery pad
Adjustable backrest pressure
Dorsokinetic backrest
Armrests3D armrests with leather covers 
Seat mechanismSimilar mechanism 
Seat height-adjustmentGaslift with mechanical depth-springing 
BaseAluminium base, polished 
Model colour
(mechanism and plastic parts)
SpecificationHard castors for soft floors
Neck support, leather colour matches the upholstery choice
Soft castors for hard floors
open up 

User weightRecommended for user weights up to 120 kg

• Anatomically shaped seating surface with pelvis support, seat hollow and rounded front edge of seat 
• Shaped foam (polyurethane foam) 
• Upholstery thickness 40 mm 
• Width 485 mm, depth 420 mm, optional large seating 485 x 450 mm

Seat height-adjustment • Gaslift with mechanical depth-springing: reinforced cushioning of the body‘s weight even in the lowest seat position, height adjustment  
420 - 545 mm
Base • Aluminium base, powder-coated, black, white aluminium, white or polished aluminium 
• Hard or soft castors with 65 mm diameter
Backrest • Backrest of frame fitted with membrane covering (with 6 different colours), optional flat cushion 
• Flexible connection to the backrest frame (dorsokinetic system) ; in combination with the Similar mechanism the backrest reaches a wide open angle of
45° (depends on the weight of the user) 
• Optional height adjustable lumbar support, upholstered with black fabric, 100 mm height adjustable for precise adaptation to the back of the user 
• Completely recovered with leather, adjustable in height and tilt, vertical 90 mm, forward 80 °; in black leather for models in fabric, for models in leather, the leather colour matches the upholstery choice

• Standard armrests with soft-touch or leather covers
• Optional 3D armrests with soft-touch, leather or gel-pad covers, height adjustment 100 mm (210 - 310 mm) 

Mechanism • Similar mechanism with tension control: balanced force curve due to coordinated spring concept 
• Seat and backrest move completely synchronised with the body 
• Synchronicity relationship between seat and backrest 1:2.7
• Adaptation to different user weights enables sensitive latching of the rapid adjustment mechanism (leaning pressure 450 - 1200N and 550 - 1500N (stronger spring) [10N = 1 kg]) 
• Backrest inclination to approx. 35°, can be locked in virtually continuously variable manner (11 different settings) 
• Permanent back support even when the backrest is inclined backwards at a wide angle, due to uniform force distribution of the mechanical springs 
• Optional seat-inclination adjustment mechanism (- 4°) for even less pressure on the upper thighs
Standards / Certificates

• GS label by TÜV Rheinland LGA Products GmbH / DIN EN 1335
• Ergonomics Certificate by TÜV Rheinland LGA Products GmbH 
• Tested for harmful substances by TÜV Rheinland LGA Products GmbH
• QUALITY OFFICE quality seal 
• GREENGUARD certified 
• AGR quality seal - Healthy Backs Campaign
• iF product design award 2001 
• Red Dot Design Award 2000
• Design Award of the Federal Republic of Germany, 2002
• best of NeoCon 2001, silver award
• Baden-Württemberg International Design Award 2003

Warranty 5 years


TO MEDIACENTER    You can also download all the images and documents from the Sedus Mediacenter.

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