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 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 portable seat apparatus including a support seat having a support seat body sized to support a user's back, the support seat body having a first end and a second end opposite the first end, the second end sized to terminate a distance above a user's hamstrings, at least one strap coupled to the support seat body and configured to surround a user's body part, and a support assembly including a base couplable to a ground surface and a height adjustable support column having a proximal end opposite a distal end, the proximal end coupled to the support seat and the distal end rotatably coupled to the base such that the proximal end of the support column is rotatable toward and away from the base.

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 chair comprises a seat with a seat carrier comprising a buttock section at the rear and a knee section at the front, a height adjustment device coupled to the seat, and a foot part configured to be placed on a surface. The height adjustment device is configured to change the distance between the seat and the foot part. The seat is designed in such a manner that a height of the buttock section of the seat carrier and a height of the knee section of the seat carrier can be changed relative to one another. The chair further comprises a blocking structure configured to block the height adjustment device when the height of the buttock section of the seat carrier and the height of the knee section of the seat carrier are in a target position relative to one another.

An item of seating furniture having a sitting surface which is mounted on a frame structure and which can be lifted from a lower position to an upper position by means of a lifting device, said lifting device having a scissors mechanism that has at least two limb parts which can pivot relative to each other. At least one spring element which is prestressed in the lower position, acts in the direction of the upper position and can be arranged in at least two different angular positions engages with at least one of the limb parts which is mounted via an articulated joint to the frame structure.

An item of seating furniture having a sitting surface which is mounted on a frame structure and which can be lifted from a lower position to an upper position by means of a lifting device, said lifting device having a scissors mechanism that has at least two limb parts which can pivot relative to each other. At least one spring element which is prestressed in the lower position, acts in the direction of the upper position and can be arranged in at least two different angular positions engages with at least one of the limb parts which is mounted via an articulated joint to the frame structure.

A foldable chair includes a seat panel having a first end portion and a second end portion, a pivotable support having a first end portion and a second end portion, the first end portion of the pivotable support pivotally connected to the first end portion of the seat panel, and a variable resistance support assembly pivotally coupled to the second end portion of the seat panel for selectively raising and lowering the seat panel. The variable resistance support assembly can include a housing, with a first spring and a second spring stored therein. The first spring can have a first pressure load and the second spring can have a second pressure load that is less than the first pressure load.

The invention relates to an active dynamic stool comprising the following: a seat part, a three-dimensional articulation system made up of at least three legs with foot parts at the lower end thereof, wherein the legs each have their upper end mounted on the seat part for movement on seat-part-mounted connecting articulations, such that the seat part can execute oscillating and circular movements in respect of its non-deflected rest position.