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Chairs with manual seat riser
These chairs have seat bases which are hinged at the front edge and have a gas operated mechanism, coiled or pneumatic springs to tilt the seat forward.
It is important that the lifting mechanism is adjusted according to the user's weight so that adequate assistance is provided when the user rises, but not to eject them from the chair. Users need enough strength in their arms to lift their body from the seat in order to trigger the riser mechanism.
The riser function may be available with or without locking mechanism. The locking release lever can usually be situated on either side of the chair and secures the seat in the 'down' position so that the mechanism is inactive, should the user shift their weight to alter their position within the chair. View relevant references ‣