Abstract: A device for adjustment inclination of a chair seat has a spindle rotatable upon applying a torque and a seat bearing member, which is mounted on the spindle. The seat bearing member is displaceable axially along the spindle and pivotal about an axis which extends perpendicular to the spindle, to provide the chair seat with angular displacement.

Abstract: The invention relates to a braking device for wheeled chairs, the device (1) including at least two brake legs (2, 3) which can be lowered to, or raised from a substructure while being positionally movement-oriented with the aid of tubular members (4, 5) fixed to the chair frame, these vertical leg movements being actuable via urging structure (6, 7) situated above the respective brake leg for performing a turning movement with the aid of a shaft (8), to which they are fixed, this movement resulting in one direction in arresting the chair moving the legs (2, 3) downwards into their braking position, and in the opposite direction in upward movement of the legs into their inactive position.

Abstract: An arrangement for a chair having a central pillar (4) supporting a seat provided with a back support, coacts with a base structure (1) which includes at least three feet (2) constructed from supporting members (5) integral with, and projecting transversely from, a central sleeve (3) accommodating the pillar. Free end portions (6) of the members (5) project a given distance from the sleeve (3) and have fastening elements (7) for wheels or other floor-contacting elements (10) bearing against a floor or other substructure. At least one extension piece (8) is removably mountable on the fastening elements (7) of the supporting members (5) in place of the wheels or other floor-contacting elements (10) which are mounted on the fastening means (7) in a standard chair construction. This construction achieves greater spread of the floor contacting elements (10) and mitigation of the risk of tipping of the chair when it is provided with extra equipment, such as a neck rest.