| 主权项 |
1. An armrest assembly for a chair comprising:
an armrest unit including:
a base including a receiving portion having a first sidewall and a first bottom wall, with the first sidewall including a notch, with the first bottom wall including an opening;an adjusting seat mounted in the receiving portion of the base, with the adjusting seat including a second bottom wall and a second sidewall, with the adjusting seat having a length in a length direction smaller than a length of the receiving portion of the base in the length direction, with the base movable relative to the adjusting seat in the length direction, with the second bottom wall of the adjusting seat further including a transverse slot having a wall with a plurality of transverse positioning teeth spaced from each other in a width direction perpendicular to the length direction, with a tooth groove defined between two adjacent transverse positioning teeth, with a first elastic element including an end attached to the adjusting seat, with the second sidewall including an inner face having a plurality of vertical positioning teeth spaced from each other in the length direction;a seat including a third bottom wall having a length in the length direction larger than a length of the transverse slot in the length direction, with the seat further including a positioning portion extending through the opening of the base and received in the transverse slot of the adjusting seat, with a mounting board mounted in the transverse slot and fixed to the positioning portion, with the mounting board having a length in the length direction larger than the length of the transverse slot, with the adjusting seat coupled to the seat and slideable relative to the seat in the width direction, with the positioning portion of the seat including a plurality of positioning grooves corresponding to the plurality of transverse positioning teeth;a transverse positioning block mounted on the adjusting seat, with the transverse positioning block movable in the length direction, with the transverse positioning block including a plurality of teeth, with the plurality of teeth of the transverse positioning block engageable with the plurality of transverse positioning teeth and a plurality of positioning grooves of the base, with the transverse positioning block further including an engagement portion having a guiding peg;an actuating board mounted above the transverse positioning block and movable relative to the adjusting seat in the width direction, with a first elastic element having another end attached to a side of the actuating board, with the actuating board further including a slant guiding slot extending in a direction at an acute angle to the length and width directions, with the guiding peg of the transverse positioning block slideably received in the slant guiding slot of the actuating board, with the actuating board further including an abutment portion;a first control button including a side having a pressing portion, with the pressing portion extending out of the notch of the base, with the first control button further including a plurality of teeth engageable with the plurality of vertical positioning teeth of the adjusting seat, with the first control button further including an abutment side abutting the abutment portion of the actuating board; andan upper cover fixed to and covering the base,with the first elastic element biasing the plurality of teeth of the transverse positioning block to extend through the tooth grooves of the plurality of transverse positioning teeth and to engage with the plurality of positioning grooves of the base, with the plurality of teeth of the first control button engaged with the plurality of vertical positioning teeth of the adjusting seat, positioning the armrest unit in the length and width directions,wherein if the first control button is pressed by the pressing portion, the actuating board is moved, the plurality of teeth of the transverse positioning block disengages from the tooth grooves of the plurality of transverse positioning teeth and the plurality of positioning grooves of the base, the plurality of teeth of the first control button disengages from the plurality of vertical positioning teeth of the adjusting seat, allowing adjustment of a position of the armrest unit in the length direction and the width direction; and a support rod unit including:
a lower rod adapted to be fixed to a body of a chair, with the lower rod including a receptacle extending in an axial direction of the lower rod, with a screw rod coupling seat received in the receptacle and including a screw hole;an upper rod including a peripheral wall having an inner peripheral face defining a longitudinal hole, with the lower rod received in the longitudinal hole of the upper rod, with the peripheral wall of the upper rod further including a window in communication with the longitudinal hole, with a connection board fixed to an upper end of the upper rod and fixed to the seat, with the connection board having an axial hole in communication with the longitudinal hole;a screw rod recessed in the longitudinal hole of the upper rod, with the screw rod being in threading connection with the screw rod coupling seat, with an axle formed on an upper end of the screw rod, with the axle rotatably coupled to the axial hole of the connection board, with the screw rod further including a gear aligned with the window of the upper rod; anda second control button mounted in the window of the upper rod, with the second control button including an engagement tooth, with the position of the armrest unit in a height direction perpendicular to the length and width directions being fixed when the engagement teeth of the second control button engage with the gear on the screw rod, with the position of the armrest unit in the height direction being adjustable if the second control button is operated to disengage the engagement teeth from the gear on the screw rod. |
