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Chair seat and back structureChair seat and back structure description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070170756, Chair seat and back structure. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a chair seat and back structure, more particularly one, which makes the chair more comfortable to sit on. [0003] 2. Brief Description of the Prior Art [0004] In order for allowing people to sit on chairs for a long period of time, chair seats and backs are usually formed with convexities and concavities according to ergonomics. [0005] Referring to FIGS. 1 and 2, a currently existing chair seat and back structure includes a board-shaped basic part 41, a foam part 42, and a piece of cloth 43. The board-shaped basic part 41 has a proper curvature, and it can be plastic or alternatively it can be wooden. The foam part 42 is stuck on the board-shaped basic part 41, and the cloth 43 is stuck on the foam part 42 and secured to the board-shaped basic part 41. [0006] The chair seat and back structure is found to have the following disadvantages: [0007] 1. When a person is seated on the chair, the foam part will be compressed owing to the sitter's body weight, and the sitter's body will feel the board-shaped basic part, which is relatively hard, even if the foam part is somewhat soft and elastic. Consequently, the sitter will have bad blood circulation and feel numbness and pain after having been seated on the chair for a long period of time. [0008] 2. The sitter will feel hot and uncomfortable after having been seated on the chair for an extended period of time because air can't travel through the seat and the back. [0009] 3. It will take relatively much time and labor to make the board-shaped basic part curve smoothly if the board-shaped basic part is wooden. Furthermore, wooden materials are relatively expensive. SUMMARY OF THE INVENTION [0010] It is a main object of the present invention to provide an improvement on a chair seat and back structure to overcome the above-mentioned problems. The seat and back structure of the invention includes a loop-shaped part with a space encompassed by an inner edge, and an elastic covering part. The loop-shaped part has a curvature and a loop-shaped holding groove near to a circumferential edge thereof. The covering part is positioned over the loop-shaped part, in tension and with a circumferential edge thereof being passed into the loop-shaped holding groove and secured to the loop-shaped part. Therefore, the covering part will be changed in the shape by the sitter's body curvature, and the sitter will be comfortably supported on the chair, with his body touching the seat and back structure with increased area. BRIEF DESCRIPTION OF THE DRAWINGS [0011] The present invention will be better understood by referring to the accompanying drawings, wherein: [0012] FIG. 1 is a lateral sectional view of the currently existing structure, [0013] FIG. 2 is a rear perspective view of the currently existing structure, [0014] FIG. 3 is a lateral sectional view of the present invention, [0015] FIG. 4 is a partially exploded perspective view of the invention, [0016] FIG. 5 is a lateral sectional view of the first preferred embodiment in the present invention, and [0017] FIG. 6 is a lateral sectional view of the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0018] Referring to FIGS. 3 to 5, a first preferred embodiment of a chair seat and back structure in the present invention includes a loop-shaped part 1, and a covering part 2. [0019] The loop-shaped part 1 has a proper curvature and a loop-shaped holding groove 12 near to a circumferential edge thereof, and it is preferably made of plastic by means of injection molding. And, a space 11 is encompassed by an inner edge of the loop-shaped part 1. [0020] The covering part 2 is secured over the loop-shaped part 1, and it includes an inner covering sheet 21, a foam part 22, and an outer covering sheet 23, which foam part 22 can be made of foam rubber. The outer covering sheet 23 can be a piece of cloth or alternatively it can be a piece of leather. The foam part 22 is stuck on the inner covering sheet 21, and the outer covering sheet 23 is positioned over the foam part 22. Continue reading about Chair seat and back structure... Full patent description for Chair seat and back structure Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Chair seat and back structure 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 Chair seat and back structure or other areas of interest. ### Previous Patent Application: Self-regulating side facing closeout for seat back Next Patent Application: Temporary protective seat cover Industry Class: Chairs and seats ### FreshPatents.com Support Thank you for viewing the Chair seat and back structure patent info. 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