Novel sit-stand seating devices, more particularly, to sit-stand seats or stools that can tilt forward to provide balanced support for seated to near-standing postures and methods of their use are disclosed. The sit-stand devices are useful, inter alia, to provide stabilized worker positioning to carry out a task for a range of sitting through standing postures in an environment associated with a task for a worker in need thereof.

A power leisure reclining chair includes a seat structure having a seat portion and a backrest portion, a support assembly having two wooden leg assemblies connected by a wooden cross beam, and a main push rod positioned between the seat structure and the cross beam to push the seat structure to swing. A metal frame and an armrest are arranged on the leg assembly. The support assembly has metal bars extending from a pivot pin on each leg assembly and connecting the seat portion. The metal bar is pivoted to the metal frame. The backrest portion is held at the rear of the leg assemblies by a rail guide system. The rail guide system has guide elements fixed to the leg assembly, and rail member fixed to the backrest portion. The guide element has an under and a top bearing against the bottom and side of the rail member.

A chair according to the present invention has a reference position P located midway in a front-back direction in a movable range of a seat 2. The chair includes a return force generation mechanism 4 configured to generate a return force in a direction to return the seat 2 moved from the reference position P at least in the front-back direction to the reference position P. The return force generation mechanism 4 includes an elastic member 40 configured to increase the return force in the direction to return the seat to the reference position P as the amount of movement of the seat from the reference position P increases.

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.

An adjustable seat includes a carrier, a seat body, a first linking rod, a second linking rod, a sliding mechanism, and an adjustment block. The seat body is arranged on the carrier and includes a seat surface switchable between a first direction and a second direction. The first linking rod is hinged to the seat body and the carrier. The second linking rod is hinged to the seat body and the carrier. The sliding mechanism includes a slide rail and a slide block slidably engaged with the slide rail. The slide block is hinged to the seat body. The slide rail is hinged to the first linking rod and the second linking rod. The adjustment block is slidably coupled to the slide rail or the seat body for switching the seat surface between the first orientation and the second orientation.

This disclosure relates to a seat device (1) comprising an underframe (2) and a seat (3) connected to the underframe (2) in such a way as to pivot about a pivot seat axis (A1), there being provided means for elastically biasing the seat (3) in anti-clockwise rotation. The seat device (1) further comprises a lumbar part (42); rotationally secured to the seat (3), and a saddle (5) for supporting the top of the thighs of the user, the saddle (5) being connected to the front region of the seat (3).

A support for a piece of seating furniture provides an additional degree of freedom of movement. The support has a connecting unit fitted on a main body that connects to a supporting element of an underframe. The connecting unit has a mounting device for the supporting element, in particular a mount for the upper end of the supporting element. The connecting unit is fitted on the main body such that it is possible to alter the inclination of the main body relative to the supporting element. For that purpose the main body has a preferably convex contact base, which in the fitted state is contacted by a contact head of the connecting unit, with the abutment forming a non-planar contact rather than a contact over a surface area, in particular a punctiform contact.

A seat apparatus having a simulated force feedback and a method for simulating a force sensation of driving are provided. The seat apparatus includes a seating unit, a rotary platform, and a realistic seat pallet. The seating unit includes a seat pan. The rotary platform includes a chassis and a rotary motive module. The seat pan is disposed on the chassis along a rotation axis in an inclinable manner. The rotary motive module can control the seat pan to have a forward or rearward inclined angle. The realistic seat pallet is disposed on the seat pan, and includes a movable contact cushion and a pallet motive module. Through the pallet motive module, the movable contact cushion is slidable relative to the seat pan. The pallet motive module can control the movable contact cushion to have left and right displacements, front and rear displacements, angular displacements, or yaw rotations.

A chair frame mechanism and a chair having the same are provided. The chair frame mechanism includes a movable component, a chair bracket, a leg component, a back component and a sequence component. The movable component is connected with the chair bracket. The leg component and the back component are pivotally connected with the chair bracket, respectively, and the back component is connected with the movable component. The sequence component is connected with the movable component and the chair bracket, respectively, and connected with the leg component and the back component by transmission, respectively. The sequence component is capable of controlling the chair bracket to move relative to the movable component along a preset trajectory, and orderly controlling the leg component and the back component to extend or fold relative to the chair bracket.

The reversible chair comprises two articulated portions (1, 2) with respect to a support (3), both articulated portions (1, 2) being able to be placed in a first position, wherein the articulated portion (1, 2) is in a substantially vertical position, and in a second position, wherein the articulated portion (1, 2) is in a substantially horizontal position, the chair further comprising two stop plates (4, 5), each of which is joined in rotation to one of the two articulated portions (1, 2), said stop plates (4, 5) being separated from each other when the two articulated portions (1, 2) are in the first position and in contact with each other when one of the articulated portions (1, 2) is in the second position. It provides a reversible chair that can be oriented in two different orientations and that is as simple and cheap as possible.