| Chair with aid in lying back and getting up -> Monitor Keywords |
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Chair with aid in lying back and getting upChair with aid in lying back and getting up description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060238007, Chair with aid in lying back and getting up. 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. In particular, the present invention relates to a chair with aid in lying back and getting up. [0003] 2. Description of the Related Art [0004] FIGS. 9 and 10 of the drawings illustrate a conventional chair with aid in lying back and getting up. In other words, the chair may assist the user in lying back into the chair or getting up from the chair. The chair comprises a base 10', a seat 11', a backrest 12' pivotally connected to a rear end of the seat 11', a transmission mechanism 13', and a footrest 14'. The transmission mechanism 13' comprises a motor 131' pivotally mounted to a rear end of the base 10' and a telescopic rod 132' extending from the motor 13' and having a front end pivotally connected to a front end of the seat 11'. The footrest 14', the seat 11', and the transmission mechanism 13' are so connected that the backrest 12' is inclined rearward and the footrest 14' is extended when the telescopic rod 132' is in a retracted position, assisting in lying down of the user (FIG. 9) and that the footrest 14' is folded and the backrest 12' is moved forward when the telescopic rod 132' is in an extended position, assisting in getting up of the user (FIG. 10). [0005] The center of gravity of the user sitting in the chair is usually located in a longitudinal position adjacent to the rear end of the chair. However, the force applied by the telescopic rod 13' acts on the front end of the chair 11', resulting in unstable movement of the seat 11'. Further, the telescopic rod 132' extending forward from the rear end of the base 10' could not reach the location on which the center of gravity of the user sitting in the chair generally locates, failing to provide a reliable support for the seat 11' when the seat 11' is moving forward. [0006] FIGS. 11 and 12 illustrate another conventional chair with aid in getting up and lying down. The chair comprises a base 20', a seat 21', a backrest 22' pivotally connected to the seat 21', a transmission mechanism 23', and a footrest 24'. The transmission mechanism 23' comprises a motor 231' and a telescopic rod 232' extending rearward and having a top end fixed to the backrest 22'. The footrest 24', the transmission mechanism 23', and the seat 21' are so connected that the backrest 22' is inclined rearward and the footrest 24' is extended when the telescopic rod 232' is in a retracted position, assisting in lying down of the user (FIG. 11) and that the footrest 24' is folded and the backrest 22' is moved forward when the telescopic rod 232' is in an extended position, assisting in getting up of the user (FIG. 12). [0007] The center of gravity of the user sitting in the chair is usually located in a longitudinal position adjacent to the rear end of the chair. However, the telescopic rod 232' is connected to the backrest 22' (i.e., at a rear of the seat 21'), not the location on which the center of gravity of the user sitting in the chair generally locates, failing to provide a reliable support for the seat 21' when the seat 21' is moving forward. SUMMARY OF THE INVENTION [0008] An objective of the present invention is to provide a chair in which the seat is reliably supported and moves smoothly during forward movement of the seat for assisting in getting up of the user. [0009] Another objective of the present invention is to provide a chair with a footrest that can be extended or folded in response to movement of a transmission mechanism. [0010] A chair in accordance with the present invention comprises a base having a front end and a rear end, a seat including a seat frame that has a central portion and a rear end, a backrest having a lower end pivotally connected to the rear end of the seat frame, and a transmission mechanism. [0011] The transmission assembly includes a motor, a telescopic rod actuated by the motor to move in a retracting direction and an extending direction, and a transmission plate. The motor has an end pivotally connected to the front end of the base. The transmission plate is pivotally connected to the central portion of the seat frame. A connecting rod includes a first end pivotally connected to the lower end of the backrest frame and a second end pivotally connected to the transmission plate. [0012] The transmission plate includes a top support portion. The telescopic rod is directed to a position below a central portion of the seat. The transmission plate further includes a first pivotal portion on an upper portion of a front side thereof for pivotal connection with the central portion of the seat. The transmission plate further includes a second pivotal portion on a lower portion of the front side thereof for pivotal connection with the second end of the connecting rod. The transmission plate further includes a third pivotal portion on a lower portion of a rear side thereof for pivotal connection with the telescopic rod. [0013] When the telescopic rod is extended, the transmission plate rotates and the backrest is folded. When the telescopic rod is retracted, the top support portion of the transmission plate presses against the seat frame to make the rear end of the seat frame move upward and forward. [0014] In an embodiment of the invention, the base further comprises a supporting portion at a rear end thereof for supporting the rear end of the seat. [0015] Preferably, the base comprises a connecting plate mounted on each of two lateral sides of the front end of the base. A connecting plate is mounted to each of two sides of the rear end of the seat frame. The chair further comprises two connecting rods each having a first end pivotally connected to an associated one of the connecting plates and a second end pivotally connected to an associated one of the connecting plates. [0016] Preferably, the seat frame further includes a front end to which the footrest mechanism is pivotally connected. The footrest mechanism comprises a toggle mechanism, a footrest frame, and a connecting rod. The toggle mechanism includes two ends respectively and pivotally connected to the front end of the seat frame and the footrest frame. The connecting rod includes a first end pivotally connected to the toggle mechanism and a second end pivotally connected to the second pivotal portion of the transmission plate. [0017] In another embodiment of the invention, the chair further comprises two armrests respectively mounted on two sides of the seat frames. [0018] In a further embodiment of the invention, the seat comprises a front end pivotally connected to the front end of the base. The seat frame comprises a front frame and a rear frame that is pivotally connected to the front frame. When the telescopic rod is extended, the top abutting portion presses against the seat frame to make the rear end of the seat frame move upward and forward. [0019] Preferably, a second connecting rod has a first end pivotally connected to the front end of the seat and a second end pivotally connected to the rear frame of the seat frame. A third connecting rod has a first end pivotally connected to the backrest frame and a second end. The footrest mechanism comprises a toggle mechanism and a footrest frame. The toggle mechanism includes two ends respectively and pivotally connected to the front end of the seat and the footrest frame. The toggle mechanism is connected to the second end of the third connecting rod. [0020] Preferably, the chair includes an elastic element having a first end connected to the toggle mechanism and a second end connected to the seat. [0021] Preferably, the second end of the third connecting rod comprises an elongated slot, and the toggle mechanism is pivotally and slidably engaged in the elongated slot. [0022] Other objectives, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings. Continue reading about Chair with aid in lying back and getting up... Full patent description for Chair with aid in lying back and getting up Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Chair with aid in lying back and getting up 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 with aid in lying back and getting up or other areas of interest. ### Previous Patent Application: Armchair for formation and correction of human spine Next Patent Application: Chair for spinal deceases prevention and treatment Industry Class: Chairs and seats ### FreshPatents.com Support Thank you for viewing the Chair with aid in lying back and getting up patent info. IP-related news and info Results in 0.14676 seconds Other interesting Feshpatents.com categories: Software: Finance , AI , Databases , Development , Document , Navigation , Error 174 |
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