Adjustable armrest assemblies for chairs

Claim 2

An armrest assembly for a chair, comprising: a base including a lower end secured to the chair and an upper end, a vertical post mounted to the upper end of the base and adjustable in a vertical direction relative to the upper end of the base, the vertical post comprising at least one guide pin mounted thereto, and an armrest securely attached to the vertical post to move therewith in the vertical direction, the armrest including at least one elongated slot defined therein through which said at least one guide pin extends, said at least one slot being extended in a horizontal direction at an angle with a longitudinal axis of the armrest, whereby a sliding movement of the armrest relative to the vertical post causes the armrest to move in a longitudinal direction and a transverse direction on a horizontal plane on which the armrest locates.

Claim 3

The armrest assembly according to claim 1, wherein said at least one elongated slot is inclined.

Claim 4

The armrest assembly according to claim 1, wherein the upper end of the base includes a plurality of vertically spaced engaging grooves defined therein, and the vertical post includes a pin mounted therein for releasably engaging with one of said plurality of engaging grooves, and a control means is provided to actuate the pin to disengage from the engaging grooves.

Claim 5

The armrest assembly according to claim 1, wherein the vertical post comprises an outer sleeve attached to a lower end thereof.

Claim 6

An armrest assembly for a chair, comprising: a base including a lower end secured to the chair and an upper end, the upper end of the base including a plurality of vertically spaced engaging grooves defined therein, a vertical post mounted to the upper end of the base and adjustable in a vertical direction relative to the upper end of the base, the vertical post including a pair of horizontal plates which together define a space therebetween, each said plate including a slot defined therein through which the upper end of the base extends, a control member including a button mounted outside the vertical post for manual operation and a pair of walls projecting from the button into the space, each said wall having a cavity defined in a distal end thereof for receiving a pin, a U-shaped member being mounted in the space, the pin being transversely extended through the U-shaped member to move therewith, and a spring being attached between the U-shaped member and the vertical post to bias the pin to engage with one of said plurality of engaging grooves, and an armrest securely attached to the vertical post to move therewith in the vertical direction, said pin being disengaged from the engaging grooves to allow vertical movements of the vertical post and the armrest relative to the base when the button is pressed.

Claim 7

An armrest assembly for a chair, comprising: a base including a lower end secured to the chair and an upper end, the upper end of the base including a plurality of vertically spaced engaging grooves defined therein, a vertical post mounted to the upper end of the base and adjustable in a vertical direction relative to the upper end of the base, the vertical post including a pair of horizontal plates which together define a space therebetween, each said plate including a slot defined therein through which the upper end of the base extends, a control member including a button mounted outside the vertical post for manual operation and a pair of walls projecting from the button into the space, each said wall having a cavity defined in a distal end thereof for receiving a pin, a U-shaped member being mounted in the space, the pin being transversely extended through the U-shaped member to move therewith, and a spring being attached between the U-shaped member and the vertical post to bias the pin to engage with one of said plurality of engaging grooves, and an armrest securely attached to the vertical post to move therewith in the vertical direction, said pin being disengaged from the engaging grooves to allow vertical movements of the vertical post and the armrest relative to the base when the button is pressed.

Claim 8

An armrest assembly for a chair, comprising: a base including a lower end secured to the chair and an upper end, a vertical post mounted to the upper end of the base and adjustable in a vertical direction relative to the upper end of the base, the vertical post comprising at least one guide pin mounted thereto, and an armrest securely attached to the vertical post to move therewith in the vertical direction, the armrest including at least one elongated slot defined therein through which said at least one guide pin extends, said at least one slot being extended in a horizontal direction at an angle with a longitudinal axis of the armrest, whereby a sliding movement of the armrest relative to the vertical post causes the armrest to move in a longitudinal direction and a transverse direction on a horizontal plane on which the armrest locates, wherein the vertical post includes a slot defined in a top side thereof, and said at least one guide pin is slidably extended through the slot, and a spring plate is mounted on the top side of the vertical post and includes at least two positions for releasably engaging with said at least one guide pin, wherein when said at least one guide pin is retained in one of said at least two positions, a maximum displacement in the transverse direction of the armrest during movement of the armrest relative to the vertical post is different from that of the armrest when said at least one guide pin is retained in the other of said at least two positions.

Claim 9

An armrest assembly for a chair, comprising: a base including a lower end secured to the chair and an upper end, a vertical post mounted to the upper end of the base and adjustable in a vertical direction relative to the upper end of the base, the vertical post comprising at least one guide pin mounted thereto, and an armrest securely attached to the vertical post to move therewith in the vertical direction, the armrest including at least one elongated slot defined therein through which said at least one guide pin extends, said at least one slot being extended in a horizontal direction at an angle with a longitudinal axis of the armrest, whereby a sliding movement of the armrest relative to the vertical post causes the armrest to move in a longitudinal direction and a transverse direction on a horizontal plane on which the armrest locates, wherein the vertical post includes a slot defined in a top side thereof, and said at least one guide pin is slidably extended through the slot, and a spring plate is mounted on the top side of the vertical post and includes at least two positions for releasably engaging with said at least one guide pin, wherein when said at least one guide pin is retained in one of said at least two positions, a maximum displacement in the transverse direction of the armrest during movement of the armrest relative to the vertical post is different from that of the armrest when said at least one guide pin is retained in the other of said at least two positions.

Claim 10

An armrest assembly for a chair, comprising: a base including a lower end secured to the chair and an upper end, a vertical post mounted to the upper end of the base and adjustable in a vertical direction relative to the upper end of the base, the vertical post comprising at least one guide pin mounted thereto, and an armrest securely attached to the vertical post to move therewith in the vertical direction, the armrest including at least one elongated slot defined therein through which said at least one guide pin extends, said at least one slot being extended in a horizontal direction at an angle with a longitudinal axis of the armrest, whereby a sliding movement of the armrest relative to the vertical post causes the armrest to move in a longitudinal direction and a transverse direction on a horizontal plane on which the armrest locates, wherein the upper end of the base includes a plurality of vertically spaced engaging grooves defined therein, and the vertical post includes a pin mounted therein for releasably engaging with one of said plurality of engaging grooves, and a control means is provided to actuate the pin to disengage from the engaging grooves, wherein the vertical post includes a pair of horizontal plates which together define a space therebetween, each said plate includes a slot defined therein through which the upper end of the base extends, and the control member includes a button mounted outside the vertical post for manual operation and a pair of walls projecting from the button into the space, each said wall has a cavity defined in a distal end thereof for receiving the pin, and a spring is provided to bias the pin to engage with said one of said plurality of engaging grooves.

Claim 11

An armrest assembly for a chair, comprising: a base including a lower end secured to the chair and an upper end, a vertical post mounted to the upper end of the base and adjustable in a vertical direction relative to the upper end of the base, the vertical post comprising at least one guide pin mounted thereto, and an armrest securely attached to the vertical post to move therewith in the vertical direction, the armrest including at least one elongated slot defined therein through which said at least one guide pin extends, said at least one slot being extended in a horizontal direction at an angle with a longitudinal axis of the armrest, whereby a sliding movement of the armrest relative to the vertical post causes the armrest to move in a longitudinal direction and a transverse direction on a horizontal plane on which the armrest locates, wherein the upper end of the base includes a plurality of vertically spaced engaging grooves defined therein, and the vertical post includes a pin mounted therein for releasably engaging with one of said plurality of engaging grooves, and a control means is provided to actuate the pin to disengage from the engaging grooves, wherein the vertical post includes a pair of horizontal plates which together define a space therebetween, each said plate includes a slot defined therein through which the upper end of the base extends, and the control member includes a button mounted outside the vertical post for manual operation and a pair of walls projecting from the button into the space, each said wall has a cavity defined in a distal end thereof for receiving the pin, and a spring is provided to bias the pin to engage with said one of said plurality of engaging grooves.

Claim 12

The armrest assembly according to claim 7, wherein a U-shaped member is mounted in the space, the pin is transversely extended through the U-shaped member to move therewith, and the spring is attached between the U-shaped member and an inner periphery of the vertical post.

Claim 13

The armrest assembly according to claim 7, wherein the vertical post includes two half post pieces which are secured together, and the horizontal plates are provided on an inner side of one of the two half post pieces.