Abstract: A backrest assembly includes an annular front frame having a front surface on which inner and outer annular flanges are formed, defining a first annular groove therebetween. A plurality of pegs is formed in the annular groove. A net is mounted in front of the front frame in a tightened state and includes a plurality of peg holes. A periphery of the net covers the outer annular flange of the front frame and is received in the first annular groove. Each peg of the front frame extends through one of the peg holes. Inner and annular wall are formed on a front face of an annular rear frame and define a second annular groove therebetween. A plurality of stubs is formed in the second annular groove. Each stub includes a receptacle receiving one of the pegs. Fasteners are extended through engaging holes in the front and rear frames.

Abstract: A backrest assembly includes an annular front frame having a front surface on which inner and outer annular flanges are formed, defining a first annular groove therebetween. A plurality of pegs is formed in the annular groove. A net is mounted in front of the front frame in a tightened state and includes a plurality of peg holes. A periphery of the net covers the outer annular flange of the front frame and is received in the first annular groove. Each peg of the front frame extends through one of the peg holes. Inner and annular wall are formed on a front face of an annular rear frame and define a second annular groove therebetween. A plurality of stubs is formed in the second annular groove. Each stub includes a receptacle receiving one of the pegs. Fasteners are extended through engaging holes in the front and rear frames.

Abstract: A chair frame assembly includes a frame, a plurality of mounting blocks, and a plurality of wheel devices. The frame includes a plurality of legs each having a coupling hole extending along a first longitudinal axis at a first acute angle to a vertical axis. Each coupling block includes an upper, insertion section having an engaging hole extending along a second longitudinal axis and a lower, coupling section extending along an axial axis at a second acute angle to the second longitudinal axis the same as the first acute angle. The insertion section of each coupling block is engaged in the coupling hole of one of the legs with the first longitudinal axis coincident with the axial axis and with the second longitudinal axis perpendicular to the ground. Each wheel device includes a wheel and an axle coupled in the engaging hole.

Abstract: A backrest assembly includes a rigid frame having an annular body. A connecting plate is interconnected between left and right sides of the annular body above a bottom side of the annular body. A plurality of supporting plates are interconnected between the connecting plate and the bottom side of the annular body. The annular body further includes a ridge extending radially outward from an outer peripheral face thereof and spaced from a front end face of the annular body, forming a ledge between the front end face and the ridge. A flexible board includes a flange formed on a rear side thereof. The flange is mounted around the ledge and abuts against the ridge. The board further includes a plurality of vents extending from a front side thereof through a rear side thereof. Fasteners are extended through engaging holes in the ridge into fixing holes of the board.

Abstract: A backrest assembly includes a rigid frame having an annular body. A connecting plate is interconnected between left and right sides of the annular body above a bottom side of the annular body. A plurality of supporting plates are interconnected between the connecting plate and the bottom side of the annular body. The annular body further includes a ridge extending radially outward from an outer peripheral face thereof and spaced from a front end face of the annular body, forming a ledge between the front end face and the ridge. A flexible board includes a flange formed on a rear side thereof. The flange is mounted around the ledge and abuts against the ridge. The board further includes a plurality of vents extending from a front side thereof through a rear side thereof. Fasteners are extended through engaging holes in the ridge into fixing holes of the board.

Abstract: An inclination adjusting device includes an upper seat mounted below a chair seat of a chair. A coupling member is mounted to a rear end of the upper seat and includes a plurality of vertically spaced engaging portions. A lower seat is pivotably mounted to and below the upper seat. An inclination adjusting rod is pivotably mounted to a rod mounting board in the lower seat. An actuating board is connected to the inclination adjusting rod and includes at least one engaging protrusion for releasably and selectively engaging with the vertically spaced engaging portions of the coupling member. The inclination adjusting rod is pivotable between a first position in which the at least one engaging protrusion is engaged with one of the engaging portions of the coupling member and a second position in which the at least one engaging protrusion is disengaged from the engaging portions of the coupling member.