OFFICE CHAIR
A chair includes a chair leg, a backrest, a seat and a support member. The chair leg includes a stem that has a connecting end at a top thereof. The seat is integrally formed and has a seat frame, two reinforcement beams and a support member disposed between the reinforcement beams. The support member includes a plurality of ribs, and an axle connecting portion and an adjusting portion surrounded by the ribs. The axle connecting portion has an axle hole to couple with the connecting end. The support member has a support portion below the axle connecting portion. The adjusting portion includes a fixation hole. A bottom of the support member includes an axle mounting flange. One end of a support beam connects with the backrest and the other end of the support beam pivotally connects with the axle mounting flange.
1. Field of the Invention
The present invention relates generally to a chair, and more particularly to an office chair whose seat has a support member disposed under the seat. The support member can sustain the user's body weight and does not need other parts to reinforce the structure of chair. Thus, the manufacture cost is reduced.
2. The Prior Arts
Referring to
A primary objective of the present is to provide an office chair whose strength is strong enough to sustain the user's body and manufacture cost is lower than conventional office chairs.
In order to achieve the objective, a seat of an office chair according to the present invention includes a support member. The support member is integrally formed with the seat by injection molding and can be directly mounted on a top of a chair leg. The seat may incorporate a pressure adjustment unit for seat height adjustment, and can be easily coupled with a backrest. Therefore, the seat height is adjustable and the manufacture cost is lowered.
The present invention will be apparent to those skilled in the art by reading the following detailed description of a preferred embodiment thereof, with reference to the attached drawings, in which:
Referring to
Referring to
During assembly, a connecting end 302 located on a top of a stem 301 of the chair leg 30 has a threaded portion that connects with the axle hole 1411 and screws with a screw nut 33. Thus, the connecting end 302 is fixedly secured under the axle connecting portion 141. The support member 14 is then assembled on the chair leg 30 to support downward pressing load transmitted from the seat frame 12′ and the thick support portion 1412 also help to sustain the load. An adjustment lever 34 assembled with the support member 14 passes through the edge opening and the inner opening of the pivot portion 143. The adjustment lever 34 is configured to interact with a pressure adjustment unit for seat height adjustment. The pressure adjustment unit may be a hydraulic adjustment unit or a pneumatic adjustment unit. The pressure adjustment unit comprising the stem 301 adapted to be pressed downward and a contact end 303 provided at a top thereof. An intermediate portion of the adjustment lever 34 includes two rotary axle portions 343 perpendicularly protruding outward at two sides of the adjustment lever 34. A first end of the adjustment lever 34 includes a pressing portion 341 adapted to press the contact end 303. A second end of the adjustment lever 34 has an operating handle 342 adapted to receive the user's operation. The adjustment lever 34 passes through the edge opening and the inner opening of the pivot portion 143 and the rotary axle portions 343 respectively pivotally connect with the pivot connecting sleeves 1431. Once the adjustment lever 34 is assembled, the pressing portion 341 is positioned above the contact end 303, whereas the operating handle 342 is accessible by the user for manual operation. When the operating handle 342 is pulled upward, the adjustment lever 34 rotates owing to the pivot connection between the rotary axle portions 343 and the pivot connecting sleeves 1431, causing the pressing portion 341 to press downward against the contact end 303 and the stem 301 to perform seat height adjustment. Further, the office chair has a support beam 32 to connect the backrest and the seat. After the support beam 32 is pivotally connected with the axle mounting flange 146, a fixing screw 321 is inserted through a threaded hole of the support beam 32, and the screw nut in the fixation hole 1421 of the support member 14. Through the fixture of the fixing screw 321 and the support points provided by the axle mounting flange 146, the support beam 32 is able to support the backrest 20 mounted on an upper end thereof. Moreover, the fixing screw may also adjust the backrest.
Although the present invention has been described with reference to the preferred embodiment thereof, it is apparent to those skilled in the art that a variety of modifications and changes may be made without departing from the scope of the present invention which is intended to be defined by the appended claims.
Claims
1. An office chair, comprising:
- a chair leg including a stem that has a connecting end at a top thereof;
- a seat including a seat frame that has at least two reinforcement beams;
- a backrest connected with a support beam;
- a support member disposed between the reinforcement beams and integrally formed with the reinforcement beams and the seat frame;
- wherein a plurality of ribs are formed on the support member, the support member comprises an axle connecting portion and an adjusting portion, the axle connecting portion and the adjusting portion are respectively surrounded by the ribs, the axle connecting portion has an axle hole adapted to couple with the connecting end of the chair leg, the adjusting portion includes an fixation hole, an axle mounting flange is provided on a bottom of the support member corresponding to the adjusting portion, an end of the support beam is pivotally connected with the axle mounting flange and the other end of the support beam is coupled with the backrest, and a threaded hole of the support beam is corresponding to the fixation hole.
2. The chair according to claim 1, wherein the chair leg includes a pressure adjustment unit for seat height adjustment, the pressure adjustment unit comprises the stem and a contact end provided at the top of the stem to adjust the seat height.
3. The chair according to claim 1, wherein a top of the support beam is provided with a plurality of assembly holes through which screws are engaged for securely connecting the support beam with the backrest.
4. The chair according to claim 1, wherein a fixing screw is inserted through the fixation hole of the adjusting portion and the threaded hole of the support beam to connect the support member with the support beam.
5. The chair according to claim 1, wherein the support member comprises a pivot portion proximate to the axle connecting portion, the pivot portion includes an edge opening to an outside of the support member, two pivot connecting sleeves are disposed in the pivot portion and are respective located at both sides of the edge opening.
6. The chair according to claim 5, wherein an end of an adjustment lever passes through the edge opening and the adjustment lever comprises two rotary axle portions respectively pivotally connected with the pivot connecting sleeves.
7. The chair according to claim 1, wherein the ribs on the support member cross one another, and surround the axle connecting portion and the adjusting portion.
8. The chair according to claim 1, wherein the bottom of the support member comprises a support portion under the axle connecting portion, the support portion has an area larger than that of the axle connecting portion, the axle hole penetrates through the axle connecting portion and the support portion, and the support portion is thicker than the support member.
Type: Application
Filed: Mar 27, 2009
Publication Date: Sep 30, 2010
Inventor: Min-Chun Ho (Chang-Hua)
Application Number: 12/412,665