A height adjustable chair armrest includes an armrest top portion and a supporting member coupled with a chair body. The supporting member includes an outer tube and an inner tube received in the outer tube. The inner tube includes a plurality of positioning holes. A resilient member is mounted in the inner tube and includes a body and a resilient plate slantingly branching from the body. A first peg is disposed on the body and is releasably engaged in one of the plurality of positioning holes. An actuation rod is insertable through the outer tube into an operational hole of the body to press against or release the resilient plate. A rib is disposed on an inner periphery of the inner tube and is spaced from a top end of the inner tube by a spacing. The resilient member is restrained at a side of the rib.

A height adjustable chair armrest includes an armrest top portion and a supporting member coupled with a chair body. The supporting member includes an outer tube and an inner tube received in the outer tube. The inner tube includes a plurality of positioning holes. A resilient member is mounted in the inner tube and includes a body and a resilient plate slantingly branching from the body. A first peg is disposed on the body and is releasably engaged in one of the plurality of positioning holes. An actuation rod is insertable through the outer tube into an operation hole of the body to press against or release the resilient plate. A rib is disposed on an inner periphery of the inner tube and is spaced from a top end of the inner tube by a spacing. The resilient member is restrained at a side of the rib.

An elevating structure includes an armrest support, a telescopic sleeve, and a pressing member. The armrest support has a fixing base for being fixed to a seat's underside of a chair and a tube. An upper portion of a side of the tube is formed with a positioning aperture with toothed notches. The telescopic sleeve sheathes the tube and is formed with a receiving trough. Two opposite edges of the receiving trough are separately formed with pivoting recesses. A bottom of the receiving trough is formed with a via hole. The pressing member is formed with a positioning protrusion passing through the via hole to engage with one of the toothed notches. An elastic member is disposed between the receiving trough and the pressing member to provide an outward push to the pressing member.

A seating arrangement includes a seat assembly, a control assembly, a back assembly, and a quick-connection arrangement to connect the back assembly to the control assembly, where the back assembly includes first and second reliefs and the control assembly includes first and second shafts received within the first and second reliefs respectively, and a locking arrangement that includes a primary locking member pivotable between a locked position, where the primary locking member abuts the second shaft arrangement, thereby preventing the second shaft arrangement from being removed from within the second relief, and an unlocked position, where the second shaft arrangement may be removed from within the second relief, thereby allowing the back assembly to be uncoupled from the control assembly.

A seating arrangement includes a back frame that includes a top portion, a bottom portion, and a pair of side portions that cooperate to define an opening, wherein at least one of the top portion, the bottom portion and the side portions include a longitudinally extending channel, a back shell having a forwardly facing support surface located within the opening and configured to support a seated user, and an attachment portion that extends about at least a portion of a periphery the support surface, and a cover member extending over the support surface, wherein the cover member is directly attached to the attachment portion of the back shell at an attachment location, and wherein the attachment location and the attachment portion of the back shell are located within the channel and concealed from view.

An armrest according to the present invention includes a support member (8a, 215, 308a) which is a support structure, and an armrest main body (8b, 216, 308b), the armrest main body (8b, 216, 308b) includes a lower layer member (8j) including an operation lever (8p, 235, 308p) which is supported by a support member (8a, 215, 308a) to be movable in a forward-and-rearward direction and is operated by a seated person, and an upper layer member (8k) supported by the lower layer member (8j) to be movable in right-and-left direction, and the upper layer member (8k) covers the operation lever (8p, 235, 308p) at a base position in the right-and-left direction.

A height-adjustable armrest for a chair, in particular an office chair, has an arm support, which is retained by an armrest holder. The armrest holder is pivotable and a pivoting causes the armrest to be adjusted in height. An arresting device fixes the armrest holder in a height position. The arresting device is arranged at the upper, alterable-height end of the armrest holder and has a linearly movable latching element. The latching element is connected via a guide element to the armrest holder such that each pivoting movement of the armrest holder induces a linear movement of the latching element.

In an aspect, provided is an adjustable telescoping assembly. The adjustable telescoping assembly comprises a first support member and a second support member that is slidable upon the first support member and which defines an interior volume. At least one damping element is provided that extends from outside the second support member, through the second support member into the interior volume and engages the first support member.

An arm assembly for a chair having a post, a first member, and an armrest. The first member is angularly adjustable relative to the post about a first axis between first angular movement limits, with a non-finite number of angular adjustment positions of the first member relative to the post. The armrest is operatively connected to the first member to translationally slide generally forward and rearward relative to the first member between first translational movement limits, with a non-finite number of translational adjustment positions of the armrest relative to the first member. The armrest is angularly adjustable relative to the first member about a second substantially upright axis between second angular movement limits, with a non-finite number of angular adjustment positions of the armrest relative to the first member.

An arm rest for a piece of seating furniture, in particular for an office chair, has an arm rest support and an arm support which is movable relative thereto, wherein an elastic return element is provided and the arm support is movable relative to the arm rest support against the restoring force of the return element.