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Dumbbell with adjustable weightRelated Patent Categories: Exercise Devices, User Manipulated Force Resisting Apparatus, Component Thereof, Or Accessory Therefor, Utilizing Weight Resistance, Handheld Bar With Weight At Each End (e.g., Barbell, Dumbbell, Etc.) Or Component Thereof, Having Securing Member (e.g., Locking Collar, Etc.) For Retaining Weight On BarDumbbell with adjustable weight description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070173386, Dumbbell with adjustable weight. 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 dumbbell, more particularly, to a dumbbell with adjustable weight, which has a positioning member movable in the off-centered track of the weighty disk to lock the weighty disk on the bar or to detach the same from the bar to adjust the weight of the dumbbell to an extent desired by a user for a muscle exercise. [0003] 2. Description of the Prior Art [0004] At present, many types of dumbbells for the same purpose of muscle exercise with adjustable weighty disks are available. However, due to the difference of the adjustable structure, the cost, assembly and operation of each dumbbell is different as well. [0005] As shown in FIG. 9, a conventional dumbbell includes a bar "a" with a plurality of weighty disks "b" attached to each ends thereof. In detail, each of the disks "b" has an elongated opening "b1" extending inwardly from an outer periphery thereof, and a pin "d" movable within the disk "b" in a direction intersecting the elongated opening "b1". The pin "d" is additionally urged by a spring "c" so that a front end of the pin "d" is extended into the opening "b1" and engaged with the bar "a" at a point, thus locking the disk "d" on the bar "a". [0006] Although the weighty disks can be assembled and detached easily and quickly, the conventional dumbbell still has disadvantages as follows: [0007] 1. It is manufactured expensively because it consists of excessive components, including the spring "c" and a cover "e" fixed on the outer periphery of the weighty disk "b", which are both required to ensure the engagement of the pin "d" with the bar "a". [0008] 2. It may not be used safely because the pin "d" has a projecting back end, upon which any action taken by mistake will result in sudden detachment of the weighty disk "b" from the bar "a", especially when being used, it may bring the user into danger. [0009] Therefore, there is a need for an improved dumbbell to overcome the above-mentioned disadvantages of the conventional structure. The inventor therefore with years experience has developed a dumbbell with adjustable weight according to the invention. SUMMARY OF THE INVENTION [0010] It is an object of the present invention to provide a dumbbell with adjustable weight, which is simplified and can be manufactured cheaply by providing an off-centered track of the weighty disk and a movable positioning member that can make the weighty disk and bar lock or detach. [0011] Another object of the present invention is to provide a dumbbell with adjustable weight, which can be used safely by providing a positioning member that can be completely placed into the off-centered track of the weighty disk. [0012] To achieve the above objects, the present invention provides a dumbbell including a plurality of weighty disks, a bar and a plurality of positioning member. The weighty disks have respectively an axial opening and an off-centered track extending partially across the axial opening. A stop and a first retainer are provided in the off-centered track. A bar has two ends received in the axial openings of the weighty disks and is formed with a plurality of spaced notches defined in each end thereof. The plurality of positioning members is each moveably received in the off-centered track of each weighty disk respectively. The positioning members are each provided with longitudinal slot to receive the stop therein, in order to control the movement of the positioning member. And the positioning member is provided with the second retainer cooperative with the first retainer to limit the positioning member at the predetermined position. [0013] When the positioning member moves from the periphery of the weighty disk inwardly, one end of the positioning member is engaged with the spaced notch of the bar, the weighty disk is accordingly locked on the bar for muscle exercise purpose. When the positioning member moves outwardly from the center of the weighty disk, the bar is detached from the control of the positioning member, the weighty disk is hence detach from the bar for adjusting the weight of the dumbbell. [0014] Other objects, advantages and novel features of this invention will become more apparent from the following detailed description when taken in reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS [0015] FIG. 1 is a perspective view of the first embodiment of the present invention; [0016] FIG. 2 is an exploded view of the elements of the first embodiment of the present invention; [0017] FIG. 3 is an enlarged sectional view showing a first retainer cooperating with a second retainer; [0018] FIG. 4 is an enlarged sectional view showing a stop extending through a positioning member and connected to a weighty disk; [0019] FIG. 5 is a sectional view showing a status in operation when the weighty disk is connected with the bar; [0020] FIG. 6 is a sectional view showing a status in operation when the weighty disk is detached from the bar; [0021] FIG. 7 is a perspective view of the second embodiment of the present invention; Continue reading about Dumbbell with adjustable weight... Full patent description for Dumbbell with adjustable weight Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Dumbbell with adjustable weight 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 Dumbbell with adjustable weight or other areas of interest. ### Previous Patent Application: Method and device for using weights and massage on bodies Next Patent Application: Exercise device with stretchable elastic member Industry Class: Exercise devices ### FreshPatents.com Support Thank you for viewing the Dumbbell with adjustable weight patent info. 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