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Collapsible easy chairCollapsible easy chair description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060138808, Collapsible easy chair. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims priority from Chinese Application No. 200410099054.4, filed Dec. 24, 2004, which is incorporated herein by reference. FIELD OF THE INVENTION [0002] The present invention relates generally to an easy chair. More particularly, the present invention relates to an easy chair of the type comprising a back and a leg rest, which both can be folded and inclined, making the chair easy to carry and store away. BACKGROUND [0003] Easy chairs are a type of chair that is suitable for leisure time use, especially in the garden or camping. These chairs include a back, a seat, and a leg rest, with a piece of fabric stretched over the surfaces formed by these elements. They can both be folded and inclined freely. [0004] U.S. Pat. No. 5,570,926 discloses one such chair, which is illustrated in FIG. 5. As shown in FIG. 5, this chair comprises a frame forming a back 1; two parallel side members 2 forming a seat, which are articulated in the vicinity of the lower end of back frame 1; a U-shaped frame forming a leg rest 3; two leg units 35 and 36; and a quadrilateral formed by the back, the leg rest, the side member of the seat and a sliding rod 5 of an armrest 4, on which there is a sliding fork yoke 7 slidably disposed over the sliding rod 5 for locking and maintaining an inclined back angle of the chair. When a user sits on the chair and adjusts the incline of the back 1, the entire base formed by front and rear leg units 36 and 35 as well as the sliding fork yoke 7, which is fixed at the top place of the front leg 36, is stationary. In contrast, the sliding rod 5 moves within the sleeve of the sliding fork yoke 7. Because the sliding fork yoke 7, with a locking means 8 thereon, is placed too close to the user's hand, it would hurt the user's hand when the user adjusts the back incline angle or when the user opens or closes the easy chair. It is not safe for use when transmission of movement between the back 1 and the leg rest 3 takes place, because the sliding fork yoke 7 is stationary while the sliding rod 5 slides due to the back rotating around hinge 24, which is located on the lower end of the back frame 3 for articulating with the armrest. The manipulations for adjusting incline angle may lead to biting of the user's fingers. [0005] Moreover, in order to adjust the incline of the back 1 and the leg rest 3, there is a need to set several adjustment screws (not shown) over the sliding tube 5 underneath the armrest 4, because the sliding fork yoke 7 is placed in an improper position. Thus, the configuration of the armrest 4 is not neat and has an ugly and random looking appearance. The position of the sliding fork yoke 7 is undesirable. Accordingly, there is a need in the art to develop an easy chair with a more desirable sliding fork position. SUMMARY OF THE INVENTION [0006] The object of the present invention is to overcome the deficiencies existing in the above-mentioned prior art, firstly by solving the safety problem and secondarily by providing a more esthetic and more comfortable easy chair, by providing an easy chair which is easy to set up and fold flat and which won't harm the user's fingers. The present invention overcomes the above-mentioned disadvantages by providing such a chair. [0007] The present invention provides an easychair including: [0008] a back having articulated points at lower end thereof, preferably having a rectangular frame shape and a curved integral surface; [0009] a seat having a pair of parallel side members, wherein the side members are articulated to the lower end of the back frame via a hinge point; [0010] a pair of armrests, parallel with each other, wherein each armrest includes a cover plate that rests over a tubular metal element underneath the cover plate, and wherein the armrests are articulated with the back frame via a hinge joint; [0011] a leg rest having a U-shaped frame, wherein the U-shaped frame includes a pair of parallel braces, and wherein each brace's top end is articulated to one of the armrests via a hinge joint and is further articulated to one of the side members of the seat via another hinge joint; [0012] and a base formed by a front leg unit and a rear leg unit, wherein each of the leg units has a pair of parallel braces (legs), and the front leg unit is articulated with the rear legs via a welded forked yoke thereon. The tops of the braces of the rear leg unit have hinge joints providing an articulation connection with the armrest and a support therefore. A transverse link is disposed between the front leg unit and the rear leg unit, and there is a sliding forked yoke thereon. The transverse link has several holes thereon for insertion by stop pins, to limit incline and to maintain an unchanging incline angle. Each different stop pin's position provides an inclined angle limitation for the back and the leg rest. The sliding forked yoke has an eccentric cam type lock for maintaining a certain incline angle of the back and the leg rest. The sliding forked yoke includes a sleeved body that integrally has a fastening plate for providing a fixed connection with the side member of the seat via a hinge joint. The sleeve has an eccentric rotating lock member positioned in the center part thereof. The transverse link at its one end has a hinged connection with the pair of braces of the front leg unit via a welded forked yoke, and at the other end thereof it slidingly engages the rear leg unit via a guiding forked yoke. The guiding forked yoke includes a guiding sleeve having a pivoted connection member for providing a terminal connection with the transverse link. The guiding sleeve has the freedom to move in a path that traces the profile of the rear leg unit. [0013] In order to bear the weight of a user, the sliding forked yoke has a fixed hinge joint with the side member of the seat for providing support to the seat. Between the base and the seat there is a two-point contact, namely, on one hand the sliding forked yoke, and on the other hand the hinge joint between the armrest and the top end of rear leg unit. The weight of the user is supported by the two above-mentioned points. The leg rest, the back frame, and the side members of the seat define a surface. A piece of fabric is secured to the easy chair and disposed across this surface. [0014] A quadrilateral is formed by an armrest, the lower end of the back frame, a side member of the seat and the upper part of the leg rest. Its deformation determines the inclined angle of both the back frame and the leg rest. [0015] All elements forming the back frame, the side members of the seat, the leg rest, the armrest, the front leg unit, and the rear leg unit are tubular metal elements. [0016] The operation of the present invention is as follows: [0017] Since the transverse link is articulated about the front leg unit by means of a pivot pin, when two leg units, i.e., the front and rear legs of the base, are folded together, the guiding forked yoke is pushed toward the bottom of the rear leg unit. Simultaneous with this downward movement, the guiding forked yoke makes the lower left corner of the quadrilateral go downward to the bottom of the rear leg unit, thus causing the quadrilateral to go flat. This result is illustrated in FIG. 4, which shows the chair folded completely flat. The chair is set up again by carrying out the above operation in reverse. BRIEF DESCRIPTION OF THE FIGURES [0018] The present invention together with its objectives and advantages will be understood by reading the following description in conjunction with the drawings, in which: [0019] FIG. 1 is a side view of the easy chair of the present invention in setup position; [0020] FIG. 2 is a local enlarged drawing of the sliding forked yoke; [0021] FIG. 3 is a local enlarged drawing of the guiding forked yoke; [0022] FIG. 4 is a side view of the easy chair shown in FIG. 1 in its folded-flat position; and [0023] FIG. 5 shows a side view of a chair in the art. (U.S. Pat. No. 5,570,926) DETAILED DESCRIPTION OF THE INVENTION Continue reading about Collapsible easy chair... Full patent description for Collapsible easy chair Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Collapsible easy chair patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Collapsible easy chair or other areas of interest. ### Previous Patent Application: Vehicle front pillar construction Next Patent Application: Convertible article and method Industry Class: Chairs and seats ### FreshPatents.com Support Thank you for viewing the Collapsible easy chair patent info. 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