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.

A chair can include a chair back, or backrest, that is coupled to a base of a chair above a seat of the chair. A tilt mechanism can attach the backrest to the base at spaced apart locations. In some embodiments, the tilt mechanism can be configured so that the backrest rotates about multiple pivots as it reclines from an upright position to a reclined position to drive forward motion of the seat during recline of the backrest.

A chair can include a chair back, or backrest, that is coupled to a base of a chair above a seat of the chair. A tilt mechanism can attach the backrest to the base at spaced apart locations. In some embodiments, the tilt mechanism can be configured so that the backrest rotates about multiple pivots as it reclines from an upright position to a reclined position to drive forward motion of the seat during recline of the backrest.

A gas spring device of an office chair has a gas spring for height adjustment by means of a movable component and at least one sensor element, which is configured to detect a load and to generate a sensor signal depending on the detected load. In addition, the gas spring device has an electronic circuit adapted to generate user data depending on the at least one sensor signal. The user data represents one or more facts about the usage of the office chair. The at least one sensor element has at least one position sensor which is configured to detect a position of the movable component and to generate a position signal depending on the detected position.

A gas spring device of an office chair has a gas spring for height adjustment by means of a movable component and at least one sensor element, which is configured to detect a load and to generate a sensor signal depending on the detected load. In addition, the gas spring device has an electronic circuit adapted to generate user data depending on the at least one sensor signal. The user data represents one or more facts about the usage of the office chair. The at least one sensor element has at least one position sensor which is configured to detect a position of the movable component and to generate a position signal depending on the detected position.

A gas spring device of an office chair has a gas spring for height adjustment by means of a movable component and at least one sensor element, which is configured to detect a load and to generate a sensor signal depending on the detected load. In addition, the gas spring device has an electronic circuit adapted to generate user data depending on the sensor signal. The user data represents one or more facts about the usage of the office chair. The at least one sensor element has at least one of the following: A force sensor for detecting a force acting on the gas spring in the direction of a longitudinal axis of the gas spring and generating a force signal therefrom and/or at least one deformation sensor for detecting a deformation of the gas spring device and to generate a deformation signal therefrom.

A piece of seating and supporting furniture with or without an armrest, comprising an upright and a basic seat and supporting structure (seat and structure) arranged thereon such that it can be pivoted about at least one horizontal axis, wherein the seat and structure has a seat surface which, in a first end position of pivoting about the horizontal axis, is arranged substantially in a horizontal plane, wherein the seat surface, in a second pivoting end position, is arranged transversely to the horizontal plane, wherein the seat and structure has a supporting surface arranged on a side of the seat and structure spaced apart from the seat surface. In another embodiment, a first end of a spring is connected to the upright, a second end of the spring is connected to the seat and structure, and the spring assists pivoting of the seat and structure about the horizontal axis.

A piece of seating and supporting furniture with or without an armrest, comprising an upright and a basic seat and supporting structure (seat and structure) arranged thereon such that it can be pivoted about at least one horizontal axis, wherein the seat and structure has a seat surface which, in a first end position of pivoting about the horizontal axis, is arranged substantially in a horizontal plane, wherein the seat surface, in a second pivoting end position, is arranged transversely to the horizontal plane, wherein the seat and structure has a supporting surface arranged on a side of the seat and structure spaced apart from the seat surface. In another embodiment, a first end of a spring is connected to the upright, a second end of the spring is connected to the seat and structure, and the spring assists pivoting of the seat and structure about the horizontal axis.

A chair can include a chair back, or backrest, that is coupled to a base of a chair above a seat of the chair. A tilt mechanism can attach the backrest to the base at spaced apart locations. In some embodiments, the tilt mechanism can be configured so that the backrest rotates about multiple pivots as it reclines from an upright position to a reclined position to drive forward motion of the seat during recline of the backrest.

A chair can include a chair back, or backrest, that is coupled to a base of a chair above a seat of the chair. A tilt mechanism can attach the backrest to the base at spaced apart locations. In some embodiments, the tilt mechanism can be configured so that the backrest rotates about multiple pivots as it reclines from an upright position to a reclined position to drive forward motion of the seat during recline of the backrest.