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This application claims priority benefit of PRC utility model application 2010291800437 filed Feb. 4, 2010, the contents of which are incorporated by reference.
The present invention in general relates to a chair, and in particular to a dual use office and leisure chair.
An office chair now is one of the necessary office supplies for an organization, but the traditional office chair only provides chair seat vertical adjustment relative to the chair legs. The inability to adjust the chair back from one fixed angle has limited the usefulness of such chairs and contributes to worker fatigue. When an office worker feels tired, there is a tendency to recline his upper body to relax, but the conventional unadjustable chair back angle cannot satisfy the need of a worker for relaxation.
To respond to this limitation, many of these types of chairs have emerged with chair backs constructed from certain flexible materials, or are installed with flexure devices. In this way, when a chair occupant habitually reclines their upper body, the chair back adapts different angles; and when a chair occupant sits upright, the chair back is also able to recover the base angle through an elastic force. These kinds of chairs in part meet a chair occupant's needs, but these other chairs also have shortcomings in that: 1) the flexure lifetime is short and the chair back resilience declines with usage and finally disappears, leaving the chair back sagging thereby limiting the utility and aesthetics of the chair; and 2) a chair occupant must apply and maintain a backward force to recline the chair; once the applied force is removed, the chair back recovers to the upright base angle.
Thus, there exists a need for a chair with a chair back having an adjustable and selectively lockable angle.
A dual use office and leisure chair is provided that overcomes the shortcomings of existing technology. A chair back is provided that is hingeably attached with the handrails. Installation of a pneumatic rod and adjustment device hingeably attached to the chair back enables adjustment to different inclination angles for the chair back, the inclination angle is selectively fixed at any angle within the travel of the pneumatic rod. Simple adjustment, easy use, and long lifetime make it possible to achieve office and leisure dual use for the chair.
The present invention is further illustrated with respect to the following nonlimiting drawings.
FIG. 1 is the schematic diagram of three-dimensional structure of an inventive chair;
FIG. 2 is a schematic side view of the inventive chair of FIG. 1 with an upright chair back;
FIG. 3 is a schematic side view of the inventive chair of FIG. 1 with the chair back depicted in a reclined position;
FIG. 4 is a perspective schematic diagram of the connection for the cover, connectors, and pneumatic rod and adjustment device shown in FIG. 1; and
FIG. 5 is the cutaway view of the connector for FIG. 4 to show the winding sheet.
The present invention has utility as a chair with a moveable chair back hingeably attached to two handrails through shafts. The installation of pneumatic rod and adjustment device hingeably attached with the chair back enables adjustment to different inclination angles α of the chair back that can simultaneously be selectively locked at a desired inclination angle α. Simple adjustment, easy use, and long lifetime make it possible to achieve both office and leisure dual use to the inventive chair. Typical range of inclination angle α range from 80 to 140 degrees and preferably are between 90 and 120 degrees. The minimum angle α is typically between 80 and 95 degrees, while the maximal angle α is typically between 100 and 140 degrees.
An inventive dual use office and leisure chair includes the chair legs, a chassis, a sitting board, and two handrails attached to the seat. The moveable chair back is hingeably attached to the bounding two handrails through a shaft. Opening slots are provided for fastener attachment. A cover is provided for rivet fixing in the shaft the described sitting board to anchor one end of the chair back angle to adjusting pneumatic rod via a hinged connector. A clearance fitting for the pneumatic rod is installed in the described hinged connector. The pneumatic rod free end is thus hingeably attached to a transition connecting board that is secured on the moveable chair back. The other end of the pneumatic rod is in contact with the side of the winding sheet which in turn is in connection with the adjustment device.
The inventive dual use office and leisure chair has an adjustment device including a control button, pulling line, and a button bracket. The button bracket is installed with the control button secured to the sitting board with fasteners. One end of the pulling line is secured in connection with the control button, and the other end of the pulling line is in connection with the winding sheet. Four chassis fixed blocks are installed between the chassis and the sitting board. Optionally, another pneumatic rod is installed between the chair legs and the chassis. The gas bar of the second pneumatic rod is in fixed connection with the chassis; the adjustment handle for the second pneumatic rod controls the lifting of the sitting board rod is installed on the chassis.
The present invention is depicted in exemplary form with respect to FIGS. 1-5. An inventive dual use office and leisure chair includes chair legs 1, chassis 2, sitting board 3, and two handrails 4 fixed on the board 3. The moveable chair back 5 is hingeably attached to the two handrails 4 through shafts 6. The shafts 6 have an aperture 301 for the hinged attachment. Similar shafts 6′ secure the handrails 4 to the sitting board 3. Cover 7 is rivet fixed to the sitting board 3. The pneumatic rod 8 preferably extends from the under surface of the cover 7 through the connector 9 and extends from the underside 303 of the board 3. Clearance fit for the rod 801 of the pneumatic rod 8 is installed to the connector 9. The gas bar 802 is hinged with the transition connecting board 10 fixed on the moveable chair back 5 with the front end hingeably attached inside the described connectors 9. The back end of the gas bar 802 in contact with the side of the winding sheet 12 which in turn is in connection with the adjustment device 11.
The adjustment device 11 includes a control button 1101, pulling line 1102, and the button bracket 1103. The button bracket 1103 installed with the control button 1101 is secured to the sitting board 3 with fasteners, such as screws. One end of the pulling line 1102 is in fixed connection with the control button 1101, and the other end of the pulling line 1102 is in connection with the winding sheet 12. Chassis fixed blocks 13 are installed between the chassis 2 and sitting board 3. While four fixed blocks 13 are depicted, it is appreciated that one of skill in the art can use a number of blocks other than four.
A second pneumatic rod 14 is optionally installed between the chair legs 1 and the chassis 2. A gas bar 1401 of the pneumatic rod 14 is in fixed connection with the chassis 2. An adjustment handle 15 controls the lifting of the pneumatic rod 14 and is installed on the described chassis 2.
The sitting board 3 has an opening slot 302 to provide relative angular travel between the moveable chair back 5 and the sitting board 3.
During use, when a user wants to recline the moveable chair back 5, the control button 1101 is activated to drive the pull wire 1102 and pull the winding sheet 12 so as to compress the gas bar 802 of the pneumatic rod 8 into the rod 801 while imposing a force against the moveable chair back 5. The moveable chair back 5 is thus pivoted about the shaft 6 on the handrails 4 to change the inclination angle α. The backward reclining inclination angle is determined by the telescopic travel of gas bar 802 of the pneumatic rod 8; when the angle is properly adjusted, the user releases the control button 1101 to selectively lock the relative position between the chair back 5 and the sitting board 3. The moveable chair back 5 is returned to a minimal travel upright and original angle by pressing the control button 1101, and under the action of compressed air from the pneumatic rod 8, the gas bar 802 extends without imposition of force on the moveable chair back 5 to be reset to the original upright angle. It is appreciated that the pneumatic rod 8 is readily mounted to make the maximal inclination angle (recline) the compressed air released position of pneumatic rod 8. Control of the optional pneumatic rod 14 through the adjustment handle 15 is readily performed to adjust the height of the sitting board 3 which is in connection with the chassis 2.
The foregoing description is illustrative of particular embodiments of the invention, but is not meant to be a limitation upon the practice thereof. The following claims, including all equivalents thereof, are intended to define the scope of the invention.