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Retractable gymnastic backboardRelated Patent Categories: Exercise Devices, GymnasticRetractable gymnastic backboard description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070167287, Retractable gymnastic backboard. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates a gymnastic backboard for use in stretching the back and/or waist of a user and more particularly, to a retractable gymnastic backboard that can be conveniently adjusted to change its height. [0003] 2. Description of the Related Art [0004] FIG. 1 shows a conventional gymnastic backboard for use in stretching a user's back and/or waist. According to this design, the gymnastic backboard 1 comprises a base frame 2, and a board member 2. The base frame 2 is a flat frame, having a first end 4, a second end 5, a first positioning groove 6 disposed near the first end 4, and a plurality of second positioning grooves 6' disposed near the second end 5 and spaced from one another in direction from the second end 5 toward the first end 4. The board member 2 is bendable, having one end engaged into the first positioning groove 6 and the other end selectively engaged into one of the second positioning grooves 6'. When in use, the gymnastic backboard 1 is put on the floor beneath the user's back (waist), and then the user can stretch the back (waist) to train the muscles of the back (waist). By means of changing the engagement position between the board member 3 and the second positioning grooves 6', the height of the gymnastic backboard 1 is relatively adjusted to fit different exercise requirements or different users. [0005] This design of gymnastic backboard is functional; however, it has drawbacks as follows: [0006] 1. When wishing to adjust the height of the board member 3, the user must disengage the board member 3 from the respective second positioning groove 6' and then bend the board member 3 to a proper curvature and then insert the board member 3 into another selected second positioning groove 6'. In order to support the user's body weight, the board member 3 is made having a certain hardness and resilience. When removing the board member 3 from the respective positioning groove 6' or engaging the board member 3 into another selected second positioning groove 6', the user must apply much force to curve the board member 3. [0007] 2. The adjustment of the height of the board member 3 is limited to the number of the second positioning grooves 6'. In order to increase the adjustment range, the length of the base frame 2 must be relatively increased. However, increasing the size of the base frame 2 results in a storage and delivery inconvenience. [0008] Therefore, it is desirable to provide a gymnastic backboard that eliminates the aforesaid drawbacks. SUMMARY OF THE INVENTION [0009] The present invention has been accomplished under the circumstances in view. It is an object of the present invention to provide a retractable gymnastic backboard, which can be conveniently adjusted to change the height to fit different users. [0010] It is another object of the present invention to provide a retractable gymnastic backboard, which can rapidly be adjusted to change the height. [0011] It is still another object of the present invention to provide a retractable gymnastic backboard, which can conveniently be adjusted to change the height with less effort. [0012] To achieve these objects of the present invention, the retractable gymnastic backboard comprises a first frame member having a positioning groove and a screw hole, a second frame member having a positioning groove, a bendable board member having two distal ends respectively engaged into the positioning groove of the first frame member and the positioning groove of the second frame member, and an adjustment rod member having a middle handhold portion, a screw portion at one end thereof and threaded into the screw hole of the first frame member, and a coupling portion at the other end thereof and pivotally coupled to the second frame member, thereby rotating the adjustment rod member can move the first frame member relative to the second frame member to further adjust the interval between the first frame member and the second frame member and the height of the board member. BRIEF DESCRIPTION OF THE DRAWING [0013] FIG. 1 is a side view of a gymnastic backboard according to the prior art. [0014] FIG. 2 is a perspective view of a retractable gymnastic backboard according to a preferred embodiment of the present invention. [0015] FIG. 3 is an exploded view of the retractable gymnastic backboard according to the preferred embodiment of the present invention. [0016] FIG. 4 is a bottom view of the retractable gymnastic backboard according to the preferred embodiment of the present invention. [0017] FIG. 5 is a side view of the retractable gymnastic backboard according to the preferred embodiment of the present invention. [0018] FIG. 6 is similar to FIG. 5 but showing the height of the retractable gymnastic backboard adjusted. DETAILED DESCRIPTION OF THE INVENTION [0019] A shown in FIGS. 2-5, a retractable gymnastic backboard 10 provided by the preferred embodiment of the present invention comprises a first frame member 20, a second frame member 30, an adjustment rod member 40, and a board member 50. [0020] The first frame member 20 is a flat frame, having a positioning groove 21 transversely disposed at one side, namely, the rear side, a screw hole 22 longitudinally disposed on the middle of the other side, namely, the front side, and two coupling rods 23 forwardly extending from the front side and arranged in parallel at two sides of the screw hole 22. Continue reading about Retractable gymnastic backboard... Full patent description for Retractable gymnastic backboard Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Retractable gymnastic backboard 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 Retractable gymnastic backboard or other areas of interest. ### Previous Patent Application: Digital weight apparatus having a biometrics based security feature Next Patent Application: Magnetic counter for small sports equipment Industry Class: Exercise devices ### FreshPatents.com Support Thank you for viewing the Retractable gymnastic backboard patent info. 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