Adjustable Stool

Adjustable Stool
How does an adjustable piston stool/ office chair work?

Hi,
Can anyone tell me or, even better, tell me a link which shows how the piston on a office chair adjusts the height? I need this for my product design school course.
Thanks.

It is a gas cylinder that has an internal piston that compresses a gas to a higher pressure when weight is put on it. A friction clamp to hold the piston’s rod in a set position is the height selector. A soft spring gives a bit of cushion when a person sits on the chair. If the chair is too low, a lever releases the friction clamp, letting the piston come up, raising the chair against the chair’s weight. If a person is sitting in the chair at that time, the gas pressure against the piston is not enough, and the chair goes down.

Shale Height adjustable Swivel Bar stools

PIANO STOOL ADJUSTABLE LEATHER HIGH GLOSS BLACK.
PIANO STOOL ADJUSTABLE LEATHER HIGH GLOSS BLACK.
€149.80
HEIGHT ADJUSTABLE BAR STOOL W/BLACK FABRIC COVERED SEAT
HEIGHT ADJUSTABLE BAR STOOL W/BLACK FABRIC COVERED SEAT
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HEIGHT ADJUSTABLE BAR STOOL W/RED FABRIC COVERED SEAT
HEIGHT ADJUSTABLE BAR STOOL W/RED FABRIC COVERED SEAT
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HEIGHT ADJUSTABLE BAR STOOL W/CREAM FABRIC COVERED SEAT
HEIGHT ADJUSTABLE BAR STOOL W/CREAM FABRIC COVERED SEAT
€108.65
ADJUSTABLE PIANO/KEYBOARD STOOL PADDED SEAT CHAIR NEW
ADJUSTABLE PIANO/KEYBOARD STOOL PADDED SEAT CHAIR NEW
€27.35
GUITAR FOOT REST / STOOL ADJUSTABLE FOOTSTOOL folding
GUITAR FOOT REST / STOOL ADJUSTABLE FOOTSTOOL folding
€9.98
Stagg Chrome Drum Stool Double Braced Drum Throne Adjustable Height - DT-32CR
Stagg Chrome Drum Stool Double Braced Drum Throne Adjustable Height – DT-32CR
€31.21
KidsKit Kiddy StepUp Stool Height Adjustable  Non-Slip Base Toddler Child Green
KidsKit Kiddy StepUp Stool Height Adjustable Non-Slip Base Toddler Child Green
€27.46
KidsKit Kiddy Step Up Stool Height Adjustable  Non-Slip Base Toddler Child Pink
KidsKit Kiddy Step Up Stool Height Adjustable Non-Slip Base Toddler Child Pink
€27.46
SKYTEC KEYBOARD PIANO SEAT ADJUSTABLE NEW FOLDING STOOL
SKYTEC KEYBOARD PIANO SEAT ADJUSTABLE NEW FOLDING STOOL
€27.35
SKYTEC KEYBOARD PIANO SEAT ADJUSTABLE NEW FOLDING STOOL *FREE P&P SPECIAL OFFER
SKYTEC KEYBOARD PIANO SEAT ADJUSTABLE NEW FOLDING STOOL *FREE P&P SPECIAL OFFER
€39.84
Maise Bar Stool Walnut Height Adjustable
Maise Bar Stool Walnut Height Adjustable
€127.39
DRUM STOOL DRUM THRONE WITH ADJUSTABLE HEIGHT SETTINGS
DRUM STOOL DRUM THRONE WITH ADJUSTABLE HEIGHT SETTINGS
€33.71
Maise Bar Stool in Oak Height Adjustable
Maise Bar Stool in Oak Height Adjustable
€127.39
Stagg Adjustable Keyboard Piano Bench Stool Seat Chair
Stagg Adjustable Keyboard Piano Bench Stool Seat Chair
€41.15
Peressini Casa Center Bar Stool Adjustable Height Barstool in Black Leather
Peressini Casa Center Bar Stool Adjustable Height Barstool in Black Leather
€460.84
Guitar players foot stool with adjustable height settin
Guitar players foot stool with adjustable height settin
€8.68
CHASE PIANO STOOL H2W BENCH HEIGHT ADJUSTABLE WHITE
CHASE PIANO STOOL H2W BENCH HEIGHT ADJUSTABLE WHITE
€187.32
CHASE PIANO STOOL H2B BENCH HEIGHT ADJUSTABLE BLACK
CHASE PIANO STOOL H2B BENCH HEIGHT ADJUSTABLE BLACK
€162.34

Volt Series Adjustable Task Stool, Black Leather
Volt Series Adjustable Task Stool, Black Leather
€407.70
Luxurious leather upholstery. Generously-proportioned seat and back cushions. Adjustable foot ring for comfort and stability. Easily mobile on a five-star base with casters….
Height Adjustable T-Arms for Interval & Essentia Series Chairs and Stools, Black
Height Adjustable T-Arms for Interval & Essentia Series Chairs and Stools, Black
€83.09
For Alera® Interval and Essentia Series Chairs. Help reduce strain on shoulders and neck. Adjustable for user’s comfort. Easy installation…
Volt Series Adjustable Task Stool, Burgundy Fabric
Volt Series Adjustable Task Stool, Burgundy Fabric
€388.45
Generously-proportioned seat and back cushions. Stain-resistant polyester upholstery. Adjustable foot ring for comfort and stability. Easily mobile on a five-star base with casters….
Volt Series Adjustable Task Stool, Black Fabric
Volt Series Adjustable Task Stool, Black Fabric
€388.45
Generously-proportioned seat and back cushions. Stain-resistant polyester upholstery. Adjustable foot ring for comfort and stability. Easily mobile on a five-star base with casters….
Volt Series Adjustable Task Stool, Navy Fabric
Volt Series Adjustable Task Stool, Navy Fabric
€388.45
Generously-proportioned seat and back cushions. Stain-resistant polyester upholstery. Adjustable foot ring for comfort and stability. Easily mobile on a five-star base with casters….
ORIGINAL PATENT APPLICATION NUMBER 19,842 FOR IMPROVEMENTS IN ADJUSTABLE SEARS OR STOOLS FOR MUSIC AND OTHER PURPOSES.
ORIGINAL PATENT APPLICATION NUMBER 19,842 FOR IMPROVEMENTS IN ADJUSTABLE SEARS OR STOOLS FOR MUSIC AND OTHER PURPOSES.

ORIGINAL PRINTED PATENT APPLICATION NUMBER 17,001 FOR IMPROVEMENTS IN ADJUSTABLE CHAIRS, STOOLS AND THE LIKE. [1902]
ORIGINAL PRINTED PATENT APPLICATION NUMBER 17,001 FOR IMPROVEMENTS IN ADJUSTABLE CHAIRS, STOOLS AND THE LIKE. [1902]

ORIGINAL PRINTED PATENT APPLICATION NUMBER 22,414 FOR IMPROVEMENTS IN ADJUSTABLE FOOTSTOOLS FOR USE BY PLAYERS OF PIANOS AND LIKE INSTRUMENTS. (1910)
ORIGINAL PRINTED PATENT APPLICATION NUMBER 22,414 FOR IMPROVEMENTS IN ADJUSTABLE FOOTSTOOLS FOR USE BY PLAYERS OF PIANOS AND LIKE INSTRUMENTS. (1910)


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