Adjustable dumbbell

• US 7,172,536 B2
• Filed: 03/01/2005
• Issued: 02/06/2007
• Est. Priority Date: 03/01/2005
• Status: Expired due to Fees

• Current Assignee: Yao Neng Chen
• Original Assignee: Yao Neng Chen
• Inventors: Liu, Wei Ming
• Primary Examiner(s): Donnelly; Jerome
• Assistant Examiner(s): Mathew; Fenn C.
• Application Number:
  US11/069,678
• Publication Number:
  US 20060240958A1
• Time in Patent Office: 707 Days
• Field of Search: 482106-109, 482 93- 95, 482/97, D21681-683
• US Class Current: 482/108
• CPC Class Codes: A63B 21/00065 by increasing or reducing the number of resistance units
• CPC Class Codes: A63B 21/0728 with means for fixing weights on bars, i.e. fixing olympic discs or bumper plates on bar-bells or dumb-bells
• CPC Class Codes: A63B 21/075 with variable weights , e.g. weight systems with weight selecting means for bar-bells or dumb-bells

Abstract

An adjustable dumbbell includes a number of weights each having a slot to receive end portions of a bar, and a number of latch rods slidably engaged in the weights and each having an inner end engageable into the slots of the weights and engageable with the bar, to anchor and latch a selected number of the weights to the bar, and to allow the selected weights to be moved in concert with the bar. The weights each has a spring member to bias and force the inner end of the latch rod to engage with and to latch the weights to the bar. The weights each includes a panel having an orifice to slidably receive the latch rod, and to anchor the latch rod to the panel when the catch of the knob is rotated relative to the panel.

Claims

1. An adjustable dumbbell comprising:

a plurality of weights each including a slot formed therein,

a bar including two end portions engageable into said slots of said weights,

a plurality of latch rods slidably received and engaged within said weights respectively, and each including an inner end engageable into said slots of said weights respectively, and engageable with said bar, to anchor and latch a selected number of said weights to said bar, and to allow said selected weights to be moved in concert with said bar,

said weights each including a spring member engaged onto said latch rod to bias and to force said inner ends of said latch rod to engage with and to latch said weights to said bar,

said latch rods each including a stop extended therefrom for engaging with said spring member, and

said weights each including a passage formed therein and communicating with said slot thereof, and a peripheral rib extended into said passage thereof to form an aperture having a reduced diameter, and to engage with said stop of said latch rod, and to limit said latch rod to move relative to said weight.

2. The adjustable dumbbell as claimed in claim 1, wherein said weights each includes a panel secured thereto and having an orifice formed therein and aligned with said passage of said weight, to slidably receive an outer end of said latch rod.

3. The adjustable dumbbell as claimed in claim 2, wherein said latch rods each includes a knob secured to said outer end thereof, said orifice of said panel includes a non-circular cross section, and said knob includes a catch provided thereon and having a non-circular cross section corresponding to that of said orifice of said panel, to allow said catch of said knob to be moved into and out through said orifice of said panel, and to allow said catch of said knob to be engaged with said panel when said catch of said knob is rotated relative to said panel.

4. The adjustable dumbbell as claimed in claim 1, wherein said bar includes a plurality of socket recesses formed in either of said end portions thereof, and defined between swellings, to receive said weights, and to anchor and position said weights to said bar.

5. The adjustable dumbbell as claimed in claim 1, wherein said bar includes at least one flat surface formed in either of said end portions thereof, to engage with said weights, and to prevent said bar from being rotated relative to said weights.

6. The adjustable dumbbell as claimed in claim 1, wherein said end portions of said bar each includes a non-circular cross section for engage with said weights, and for preventing said bar from being rotated relative to said weights.

7. The adjustable dumbbell as claimed in claim 1 further comprising a base member including two end portions each having a plurality of depressions formed therein to receive and to seat said weights respectively.

8. The adjustable dumbbell as claimed in claim 7, wherein said base member includes a protrusion extended into each of said depressions thereof, and said weights each includes a cavity formed therein, to receive said protrusion of said base member respectively, and to anchor and position said weights to said base member.

9. The adjustable dumbbell as claimed in claim 7, wherein said base member includes at least one partition extended upwardly therefrom, for seating and supporting said bar.