Abstract: A spring mechanism for a chair or a stool includes a base mount connected to a base and a seat mount connected to a seat. Two swing arms are arranged above one another. The two swing arms include a lower swing arm and an upper swing arm. Each of the two swing arms is pivotally connected to the seat mount and pivotally connected to the base mount. A spring is provided and arranged to generate an upwardly directed force onto the seat.

Abstract: A height-adjustable seat includes an integrated height adjustment mechanism. The seat includes a seat body. A pneumatic cylinder having an upper end is received in a socket of the seat body. A bracket is arranged above the socket in the seat body. An elongated actuating lever is pivotally arranged above the pneumatic cylinder and held within the bracket. A spacer secures the elongated actuating lever in the bracket. The spacer has a snap-fit connection with the bracket. The bracket and the socket may be integrally molded portions of the seat body.

Abstract: A tiltable stool includes a seat which is connected to a base by an elongated body structure. The base has an upper base element and a lower base element. The upper base element is resiliently deformable. The resiliently deformable upper base element allows the stool to pivot in any direction. The lower base element is a rotationally symmetrical outwardly convex and inwardly concave body. The upper base element may include one or more annular grooves.

Abstract: A guide spring for a seating device has an inner portion, an outer portion, and a spiral coiled portion extending more than one convolution between the inner portion and the outer portion. The inner portion is firmly attached to a rod and the outer portion is firmly attached to a body. The guide spring thereby secures a radial position of the rod within the body, allowing the rod to move axially relative to the body when a load is placed onto the seating device. When in use, the guide spring deforms from a flat spiral shape to a conical spiral shape with axial movement of the rod relative to the body.

Abstract: A guide spring for a seating device has an inner portion, an outer portion, and a spiral coiled portion extending more than one convolution between the inner portion and the outer portion. The inner portion is firmly attached to a rod and the outer portion is firmly attached to a body. The guide spring thereby secures a radial position of the rod within the body, allowing the rod to move axially relative to the body when a load is placed onto the seating device. When in use, the guide spring deforms from a flat spiral shape to a conical spiral shape with axial movement of the rod relative to the body.

Abstract: An improved tiltable stool comprises a seat, a body structure, and a base. The base comprises an annular elastic base member having a downwardly convex outer surface and a downwardly concave inner surface. Deformation of the annular elastic base causes a stabilizing force which pushes the tiltable stool towards a normal position when the tiltable stool or chair is tilted out of the normal position. The stabilizing force increases with the weight of a user and provides a consistent dynamic seating experience for users of different weights. An upper section of the annular elastic base is substantially cylindrical and firmly connected to the base structure. The downwardly convex outer surface of a lower section of the annular elastic base member rests on the floor. A contact area between the annular elastic base member and the floor is substantially ring-shaped, and grows outwardly with an increasing weight placed on the seat.

Abstract: Spring-soft intermediate mounting piece for use in a swivel chair, which comprises a chair column comprising a gas lift (1) and a standardized cone, as well as a seat mechanism comprising a conical sleeve, wherein the intermediate mounting piece comprises an elastic element so as to enable a spring-soft interconnection between the chair column and the seat mechanism. The intermediate mounting piece comprises a cartridge (3) for being able to receive the standardized cone of the chair column (9), wherein the cartridge (3) is at least partially encased by an elastic rubber element (7). In addition, the intermediate mounting piece, which comprises in an upper portion thereof a housing comprising a cone (4) for plugging the cartridge (3) of the seat mechanism and which encloses in a lower portion thereof the cartridge (3) together with the elastic rubber element (7) at least partially in the radial direction.

Abstract: An improved tiltable stool comprises a seat, a body structure, and a base. The base comprises an annular elastic base member having a downwardly convex outer surface and a downwardly concave inner surface. Deformation of the annular elastic base causes a stabilizing force which pushes the tiltable stool towards a normal position when the tiltable stool or chair is tilted out of the normal position. The stabilizing force increases with the weight of a user and provides a consistent dynamic seating experience for users of different weights. An upper section of the annular elastic base is substantially cylindrical and firmly connected to the base structure. The downwardly convex outer surface of a lower section of the annular elastic base member rests on the floor. A contact area between the annular elastic base member and the floor is substantially ring-shaped, and grows outwardly with an increasing weight placed on the seat.

Abstract: Spring-soft intermediate mounting piece for use in a swivel chair, which comprises a chair column comprising a gas lift (1) and a standardized cone, as well as a seat mechanism comprising a conical sleeve, wherein the intermediate mounting piece comprises an elastic element so as to enable a spring-soft interconnection between the chair column and the seat mechanism. The intermediate mounting piece comprises a cartridge (3) for being able to receive the standardized cone of the chair column (9), wherein the cartridge (3) is at least partially encased by an elastic rubber element (7). In addition, the intermediate mounting piece, which comprises in an upper portion thereof a housing comprising a cone (4) for plugging the cartridge (3) of the seat mechanism and which encloses in a lower portion thereof the cartridge (3) together with the elastic rubber element (7) at least partially in the radial direction.

Abstract: The disclosure relates to a chair comprising a seat part, at least one leg part, at least one foot part that consists of a predetermined plurality of foot elements and at least one spring assembly. According to the disclosure, at least one designated foot element and/or a sub-section of said element is configured to be mobile and is subject to a restoring moment under the action of a load.

Abstract: The invention relates to a chair (20) comprising a gas-filled ball (8) and a base (1) which encloses the ball (8) at least in a lower region of the ball (8), the base (1) comprising a base plate (4). The base (1) has an internal diameter which is chosen in relation to the diameter of the ball (8) in such a manner as to laterally immobilize the ball (8) in the base (1). The ball (8) is at least partially covered by a fabric or netting (7).

Abstract: The invention relates to a chair comprising a seat part (2), at least one one leg part (3), at least one foot part (5) that consists of a predetermined plurality of foot elements (4) and at least one spring assembly (6). According to the invention, at least one designated foot element (4) and/or a sub-section (4?) of said element is configured to be mobile and is subject to a resotring moment under the action of a load.