Abstract: A chair includes an upper frame disposed above and pivoted to a lower frame. An inclination adjusting device includes a latch mounted slidably on the upper frame and movable between a first position, in which the latch extends into and engages a selected one of engaging grooves in a latch engaging member that is formed on the lower frame, and a second position, in which the latch disengages the selected engaging groove.

Abstract: An improvement of a chair structure is disclosed. The chair comprising a back, a sitting pad, a supporting mechanism and a bottom cover characterized in that the supporting mechanism is provided with a securing element which allows mounting of a horizontal supporting tube; the bottom of the sitting pad is provided with a base plate having screw holes and securing hole for the bottom cover; such that screw nuts pass through the securing hole and the horizontal supporting tube to the screw hole of the base plate and the sitting pads mounted onto the supporting mechanism; the base cover is provided with a securing stud and a screw limiting stud and the securing stud is engaged to the securing hole and the base cover is secured to the bottom of the sitting pad and the horizontal supporting tube is enclosed and the limiting stud urges the screw nut so that the screw nut is prevented from dislocation to ensure the support force of the chair is stable.

Abstract: A chair includes an upper frame disposed above and pivoted to a lower frame. An inclination adjusting device includes a latch mounted slidably on the upper frame and movable between a first position, in which the latch extends into and engages a selected one of engaging grooves in a latch engaging member that is formed on the lower frame, and a second position, in which the latch disengages the selected engaging groove.

Abstract: A chair includes an upper frame disposed above and pivoted to a lower frame. A stopping device includes a slide mounted slidably on the upper frame, and a stopping member. The slide is slidable between a first position, where the stopping member is offset from a rear plate of the lower frame in a longitudinal direction, and a second position, where the stopping member is aligned with the rear plate in a vertical direction. A cam mechanism includes a cam connected movably to side plates of the lower frame and a cam follower formed on the slide and engaging the cam in such a manner that movement of the cam from a releasing position to a restricting position results in movement of the slide from the first position to the second position.

Abstract: A locking unit includes a frame to permit extension of a bolt. An upper portion of a bracket is pivoted to left and right side walls of the frame. A linking member has a rear part connected to the bracket, and a front part formed with an arcuate slot through which the bolt extends. A stationary clamping seat is fixed on the right side wall. A movable clamping member is mounted on the bolt. An operating lever is pivoted to a C-shaped connector about a first pivot, and is pivoted to the right side wall about a second pivot. When the bolt is moved to a locking position, the linking member counteracts the clamping force, which results in a pulling force that pulls the C-shaped connector in a direction toward the left side wall along a horizontal line defined by the bolt and the operating lever is prevented from being turned upwardly by the pulling force.

Abstract: A height adjusting device includes a mounting frame adapted to be secured to a seat member of a chair and provided with a plurality of retaining holes in an upright direction. A sliding member is adapted to be secured to a backrest member of the chair, and is mounted to be slidable relative to the mounting frame in the upright direction. The sliding member includes an upper portion which defines a passageway, and a lower portion. A lever member is pivotally mounted on the lower portion at a fulcrum and about a pivotal axis transverse to the upright direction, and includes actuating and retained ends respectively at two opposite sides of the fulcrum. The lever member is disposed such that the retained end is extendable through the passageway to be retained in one of the retaining holes, when the actuating end is manually operated to turn the retained end about the pivotal axis. A biasing member is disposed to bias the retained end to extend through the passageway.

Abstract: A support frame device for connecting a seat portion to an upright post includes a base mounting plate with right and left anchoring plates secured to right and left anchored plates of a spacer plate, respectively. An annular stiffening member has an annular abutment end abutting against a lower peripheral edge portion of the spacer plate. A hollow stem with an upper flange portion is extended through a post mounting bore in the spacer plate and an axial passage of the stiffening member such that the flange portion abuts against an upper peripheral edge portion of the spacer plate. An annular lower end of the stem is then malleated to form a flared portion that abuts against a lower end of the stiffening member.

Abstract: An adjustable connecting device includes an elongated sliding member secured to a backrest member, and a mounting frame having one end secured to a seat member of a chair and an opposite end connected to a mounting portion disposed rearwardly of a multilevel engaged member that is mounted to the sliding member such that the sliding member is slidable linearly relative to the mounting portion. A pawl portion is disposed in the mounting portion and is provided with an engaging key capable of sliding along a keyway in the multilevel engaged member and engaging one of a plurality of notches communicated with the keyway. An arrest member is disposed to move with the multilevel engaged member so as to grip or release the engaging key.

Abstract: A chair includes a base, a seat unit with aplastic casing, and a seat supporting unit, which is fixed on the base to support the seat unit thereon. The casing includes an upper plate and a lower plate, which are coupled together along outer peripheries thereof. The seat supporting unit includes a horizontal seat supporting plate, which is fixed thereon. An elongated metal auxiliary supporting member is fixed on the seat supporting plate, and has a left end portion that extends from a left side of the seat supporting plate, and a right end portion that extends from a right side of the seat supporting plate. Accordingly, the casing is supported on the seat supporting plate and the auxiliary supporting member. Preferably, the upper plate is formed integrally with a plurality of hollow posts, which are bolted to the seat supporting plate, thereby fixing the lower plate and the auxiliary supporting member between the upper plate and the seat supporting plate.