A vertically adjustable pedestal for a boat accessory includes a hollow outer column and an inner column positioned within the outer column. The inner and outer columns are longitudinally slidable with respect to one another. A plate is captured between the inner and outer columns. The plate is laterally adjustable to create a frictional force between the inner and outer columns that prevents lateral movement therebetween. One of the inner and outer columns is configured to be connected to a supporting surface of a boat. The other of the inner and outer columns is configured to be connected to the boat accessory.

The present disclosure proposes a height-adjustable folding chair including a base, retractable arms connected to the base and legs connected to the base; the base includes a support enclosing an inner cavity and a locking assembly arranged in the inner cavity; the support includes an upper receiving portion connected to the arms and a lower receiving portion connected to the legs; the locking assembly includes a leg unlock button inserted in the inner cavity and slidable relative to the support, a first spring, and a first locking block. The first locking block defines locking slots each with a downward opening; an end of each leg connected to the lower receiving portion defines a positioning slot and is arranged with a positioning tongue protruding from an edge of the positioning slot and a positioning block protruding upward from a bottom of the positioning slot and matched with a corresponding locking slot.

The present disclosure proposes a height-adjustable folding chair including a base, retractable arms connected to the base and legs connected to the base; the base includes a support enclosing an inner cavity and a locking assembly arranged in the inner cavity; the support includes an upper receiving portion connected to the arms and a lower receiving portion connected to the legs; the locking assembly includes a leg unlock button inserted in the inner cavity and slidable relative to the support, a first spring, and a first locking block. The first locking block defines locking slots each with a downward opening; an end of each leg connected to the lower receiving portion defines a positioning slot and is arranged with a positioning tongue protruding from an edge of the positioning slot and a positioning block protruding upward from a bottom of the positioning slot and matched with a corresponding locking slot.

To provide a chair in which the seated person can perceive a comfortable sitting feeling even if sitting for a long time, and furthermore a high work efficiency can stably be maintained, a chair according to the present invention includes a support mechanism 2 interposed between a leg 1 and a seat 3, wherein the support mechanism 2 includes: a seat inclining mechanism Q as a seat inclining function configured to downwardly incline a tip side in an operation direction of the seat 3 when the seat 3 operates from a predetermined reference position (S), and further includes: a return-force generation mechanism configured to generate, in accordance with an amount of movement, a return force in a direction of returning the seat 3 having moved from a reference position (S) in a front-rear or left-right direction, to the reference position (S).

To provide a chair in which the seated person can perceive a comfortable sitting feeling even if sitting for a long time, and furthermore a high work efficiency can stably be maintained, a chair according to the present invention includes a support mechanism 2 interposed between a leg 1 and a seat 3, wherein the support mechanism 2 includes: a seat inclining mechanism Q as a seat inclining function configured to downwardly incline a tip side in an operation direction of the seat 3 when the seat 3 operates from a predetermined reference position (S), and further includes: a return-force generation mechanism configured to generate, in accordance with an amount of movement, a return force in a direction of returning the seat 3 having moved from a reference position (S) in a front-rear or left-right direction, to the reference position (S).

The disclosure provides a telescopic structure, including a plurality of connecting pieces connected end to end; two adjacent connecting pieces are movable with respect to each other, and each of the plurality of connecting pieces includes a plurality of fixation mechanisms configured to keep the plurality of connecting pieces in an unfolded state. Also provided is a telescopic stool including a stool surface, a base, and the telescopic structure; the stool surface and the base are connected by the telescopic structure.

The disclosure provides a telescopic structure, including a plurality of connecting pieces connected end to end; two adjacent connecting pieces are movable with respect to each other, and each of the plurality of connecting pieces includes a plurality of fixation mechanisms configured to keep the plurality of connecting pieces in an unfolded state. Also provided is a telescopic stool including a stool surface, a base, and the telescopic structure; the stool surface and the base are connected by the telescopic structure.

A foldable chair comprises a chair seat, front leg tubes, rear leg tubes, and two telescopic frames. The two telescopic frames respectively correspond to the front leg tubes and the rear leg tubes. Each of the two telescopic frames comprises two support tubes and a connection tube connected to the two support tubes. The two support tubes of a first of the two telescopic frames are respectively and telescopically coupled with the front leg tubes, and the two support tubes of a second of the two telescopic frames are respectively and telescopically coupled with the rear leg tubes. A locking mechanism is disposed between each of the support tubes and a corresponding one of the front leg tubes and the rear leg tubes.

A foldable chair comprises a chair seat, front leg tubes, rear leg tubes, and two telescopic frames. The two telescopic frames respectively correspond to the front leg tubes and the rear leg tubes. Each of the two telescopic frames comprises two support tubes and a connection tube connected to the two support tubes. The two support tubes of a first of the two telescopic frames are respectively and telescopically coupled with the front leg tubes, and the two support tubes of a second of the two telescopic frames are respectively and telescopically coupled with the rear leg tubes. A locking mechanism is disposed between each of the support tubes and a corresponding one of the front leg tubes and the rear leg tubes.

A linear actuator for a furniture system comprises at least one axial flux motor (5) having a rotor (9), and at least one motion mechanism (6) attached to the rotor (9). The motion mechanism (6) is adapted to cause a linear movement of the linear actuator.

An electrically adjustable furniture system comprises at least one such linear actuator. A furniture system arrangement comprises at least one first and at least one second such electrically adjustable furniture system. A method of installing a linear actuator in a furniture system comprises the steps mounting at least one axial flux motor (5), mounting at least one motion mechanism (6), and connecting the at least one motion mechanism (6) to a rotor (9) of the at least one axial flux motor (5).