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Magnetic resistance device for upright bikesRelated Patent Categories: Exercise Devices, Involving User Translation Or Physical Simulation Thereof, Bicylcling, Utilizing Specific Resistance Generating StructureMagnetic resistance device for upright bikes description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060189452, Magnetic resistance device for upright bikes. Brief Patent Description - Full Patent Description - Patent Application Claims
FIELD OF THE INVENTION [0001] The present invention relates to a magnetic resistance device for upright bikes and the device is easily assembled and manufactured and suitable for different types of upright bikes. BACKGROUND OF THE INVENTION [0002] A conventional upright bike 70 with a magnetic resistance device 76 is disclosed in FIG. 9, and generally includes a bike frame 72 and a transmission device 74 which is connected to the frame 71 and is composed of a drive wheel 742 with a crank connected thereto, and a fly wheel 741 which is rotated by rotation of the crank by the users. The magnetic resistance device 76 includes an electric magnet 761 which is composed of silicon steel strips and coils. A control device 762 is connected to the magnet 761 so that the user can operate the control device 762 to control the current passing through the magnet 761 to control the magnetic resistance between the magnet 761 and the fly wheel 741. The silicon steel strips have to be made according to the curvature of the fly wheel 741 so as to keep an even gap between the fly wheel 741 and the silicone steel strips. However, the sizes of the fly wheels 741 may vary for different types of upright bikes so that the manufacturers have to prepare different molds for the manufacture. This increases the manufacturing cost. [0003] Another conventional magnetic resistance upright bike 80 is disclosed in FIGS. 10 and 11, and includes a frame 82 with a transmission device 84 which includes a drive wheel 841 and a fly wheel 842 which is rotated by the rotation of the crank on the drive wheel 841 by the users. A magnetic resistance device 86 is located at a distance from an outer periphery of the fly wheel 842 so as to provide a magnetic resistance to the fly wheel 842. The magnetic resistance device 86 includes a support member 861 on which a plurality of permanent magnets 862 are connected, a spring 863, a cable 864, a threaded rod 865 and a nut 866. The spring 863 has one end fixed to the support frame 861 and the other end of the spring 863 is connected to the frame 82. The spring force of the spring 863 can be adjusted by movement of the threaded rod 865 and the cable 864 and in turn to adjust the angle of the support member 861. The spring 863 keeps the support member 861 to have a tendency to maintain a t the position where a certain gap is defined between the periphery of the fly wheel 842 and the magnets 862 connected on the support member 861. A link 865 has one end pivotably connected to a base by a rivet 866 and the other end of the link 865 is connected to the other end of the cable 864. The user may operate the link 865 to adjust the width of the gap between the support member 861 and the periphery of the fly wheel 842. However, the pivotable support member 861 cannot keep the gap precisely as desired and the spring 863 has an inherent fatigue problem. [0004] The present invention intends to provide a magnetic resistance device for an upright bike wherein the magnets are located on two sides of the fly wheel and are manufactured modularized so as to obtain an economical and compact magnetic resistance device. SUMMARY OF THE INVENTION [0005] The present invention relates to a magnetic resistance upright bike which comprises a frame and a transmission device is connected to the frame. The transmission device includes a driving wheel and a fly wheel which is driven by the driving wheel. A magnetic resistance device includes a support member fixed on the frame and a magnet assembly connected on the support member. Two magnets are supported on the support member and the fly wheel is rotatably located between the two magnets. A circuit board is electrically connected to the two magnets and a control device connected to the circuit board. [0006] The fly wheel is located between the two magnets so that the magnets are not necessary made in different shapes according to the sizes of the fly wheel, so that the magnet assembly can be made modularized which is less expensive when compared with the conventional magnetic resistance devices. [0007] The present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, a preferred embodiment in accordance with the present invention. BRIEF DESCRIPTION OF THE DRAWINGS [0008] FIG. 1 is an exploded view to show the magnetic resistance device and the upright bike of the present invention; [0009] FIG. 2 is a perspective view to show that the magnetic resistance device is connected to the upright bike of the present invention; [0010] FIG. 3 is a side view of perspective view to show the upright bike with the magnetic resistance device of the present invention; [0011] FIG. 4 is an end view to show that the fly wheel is rotatably located between the two magnets of the magnetic resistance device of the present invention; [0012] FIG. 5 shows that the magnetic resistance device is connected to another position relative to the fly wheel; [0013] FIG. 6 shows another embodiment of the support member of the magnetic resistance device of the present invention; [0014] FIG. 7 shows two sets of the magnetic resistance device of the present invention are used on one upright bike; [0015] FIG. 8 shows another embodiment of the upright bike of the present invention; [0016] FIG. 9 shows a conventional magnetic resistance device on an upright bike; [0017] FIG. 10 shows another conventional magnetic resistance device on an upright bike, and [0018] FIG. 11 shows that the support member of the magnetic resistance device in FIG. 10 is pivoted away from the fly wheel. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT [0019] Referring to FIGS. 1 to 4, the upright bike of the present invention comprises a frame 10 including two posts and a transmission device 20 is connected to the frame 10. The transmission device 20 includes a driving wheel 21 and a fly wheel 23 which is driven by the driving wheel 21 by a belt or a chain. The fly wheel 23 is rotatably connected between the two posts and the driving wheel 21 is connected to a crank to which two pedals are connected so that when the user rotates the crank, the fly wheel 23 is rotated by the driving wheel 21 via the belt. Continue reading about Magnetic resistance device for upright bikes... 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