Dumbbell adjustable in weight
First Claim
Patent Images
1. A weight lifting system comprising:
- a) a weight unit comprising of a plurality of weights with each of said weights formed of a pair of upstanding plates and at least one bar, or similar connecting device, that connects each pair of plates;
b) a handle having opposing ends;
c) extendable elements which protrude from each end of the handle;
d) means for simultaneously extending and retracting the extendable elements to engage the weights, which include a means to allow travel to the full limit of the extendable elements;
e) a visual indicator indicating the amount of weight selected;
f) said handle comprises;
(i) a grip having two ends,(ii) each end having an endplate permanently attached, and(iii) a channel or channels in the grip in which the extendable elements may be extended from or retracted into;
wherein the grip has a gripping surface configured to be grasped by a user, the grip containing two channels therein, each channel housing one of said extendable elements, each said extendable element comprising a rod movably disposed within a respective channel of the grip;
wherein said means for simultaneously extending the extendable elements to engage the weight comprises means for selectively advancing the rods out of opposing ends of the grip such that the rods selectively pass through apertures in first and second ends of the weights, and the gripping surface having no obstruction to grasping by a user; and
wherein said rods comprise first and second rods having teeth formed along a length thereof, the first rod moveable by a gear connected to a selection knob, the teeth of the first rod engaging a pinion gear, and the pinion gear engaging the teeth of the second rod to move the second rod.
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Abstract
An adjustable dumbbell featuring a handle containing an internal selection mechanism within series of nested weight units. The selection device is operated by a single action, in this case by turning a knob, which extends or retracts bars contained in the handle to attach a desired number of weight units to the handle.
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Citations
20 Claims
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1. A weight lifting system comprising:
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a) a weight unit comprising of a plurality of weights with each of said weights formed of a pair of upstanding plates and at least one bar, or similar connecting device, that connects each pair of plates; b) a handle having opposing ends; c) extendable elements which protrude from each end of the handle; d) means for simultaneously extending and retracting the extendable elements to engage the weights, which include a means to allow travel to the full limit of the extendable elements; e) a visual indicator indicating the amount of weight selected; f) said handle comprises; (i) a grip having two ends, (ii) each end having an endplate permanently attached, and (iii) a channel or channels in the grip in which the extendable elements may be extended from or retracted into; wherein the grip has a gripping surface configured to be grasped by a user, the grip containing two channels therein, each channel housing one of said extendable elements, each said extendable element comprising a rod movably disposed within a respective channel of the grip; wherein said means for simultaneously extending the extendable elements to engage the weight comprises means for selectively advancing the rods out of opposing ends of the grip such that the rods selectively pass through apertures in first and second ends of the weights, and the gripping surface having no obstruction to grasping by a user; and wherein said rods comprise first and second rods having teeth formed along a length thereof, the first rod moveable by a gear connected to a selection knob, the teeth of the first rod engaging a pinion gear, and the pinion gear engaging the teeth of the second rod to move the second rod. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A weight lifting device comprising:
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a handle unit comprising a pair of endplates with a grip therebetween; said grip having a substantially obstruction free grip surface between said pair of endplates for grasping by a user, and at least one channel therein; a pair of extendable rods moveable within said at least one channel of said grip; each extendable rod having teeth along a portion thereof; said handle unit further comprises a selection knob operatively connected to a drive gear, said drive gear engaging the teeth of a first one of said pair of extendable rods; said teeth of said first extendable rod also engaging a pinion gear, said pinion gear engaging the teeth of a second one of said pair of said pair of extendable rods; a plurality of weights, each weight comprising first and second weight plates joined by at least one connecting rod, and each weight plate having an aperture aligned with said at least one channel to selectively receive one of said pair of extendable rods, wherein said handle unit can be centrally positioned between said pairs of weight plates and rotation of the selection knob rotates the drive gear and moves the first extendable rod into or out of engagement with the first weight plates of a selected number of weights via the aperture in each respective first weight plate, and the movement of the first extendable rod rotates the pinion gear and moves the second extendable rod, in a direction opposite to movement of the first extendable rod, into or out of engagement with the second weight plates of the selected number of weights via the aperture in each respective second weight plate. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification