Adjustable dumbbell

• US 7,731,641 B1
• Filed: 01/22/2009
• Issued: 06/08/2010
• Est. Priority Date: 01/22/2009
• Status: Expired due to Fees

• Current Assignee: Paul Chen
• Original Assignee: Paul Chen
• Inventors: Chen, Paul
• Primary Examiner(s): Mathew; Fenn C
• Application Number:
  US12/321,604
• Time in Patent Office: 502 Days
• Field of Search: 482/93, 482106-108, D21680-682
• US Class Current: 482/108
• CPC Class Codes: A63B 21/00065 by increasing or reducing the number of resistance units
• CPC Class Codes: A63B 21/0724 Bar-bells; Hand bars
• 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 handle having a narrowed neck segment formed on each end portion and having a base plate attached to each end portion, two or more weight members each having a slot for receiving the narrowed neck segment of the handle, and each having an enlarged opening communicating with the slot for receiving the handle and for retaining the weight members to the handle when the weight members are offset from the narrowed neck segment of the handle, and a lock nut is engaged with the handle for quickly retaining the weight members to the handle after the weight members have been disengaged from the narrowed neck segment of the handle.

Claims

1. An adjustable dumbbell comprising:

a handle including a first end portion, and including a second end portion, and including an outer thread formed on each of said first and said second end portions of said handle, and including at least one notch formed in either of said first or said second end portion of said handle for forming a narrowed neck segment in either of said first or said second end portion of said handle, and including a hand grip provided on a central portion of said handle,

a base plate provided on each of said first and said second end portions of said handle and including an outer diameter greater than that of said handle,

at least two weight members each including a slot formed therein and having a width no less than said narrowed neck segment of said handle for receiving said narrowed neck segment of said handle, and for allowing said at least two weight members to be attached to and disengaged from either of said first and said second end portions of said handle,

said at least two weight members each including an enlarged opening formed therein and communicating with said slot of said at least two weight members, and said enlarged opening including an inner diameter greater than the width of said slots of said at least two weight members and no less than the outer diameter of said handle for receiving said handle, and for allowing said at least two weight members to be retained to said handle and for preventing said at least two weight members from being disengaged from said handle when said at least two weight members are offset from said narrowed neck segment of said handle, and said at least two weight members each including an open end communicating with said slots of said at least two weight members and extending to and including an entire radius of said at least two weight members for guiding said narrowed neck segment of said handle into said slots of said at least two weight members, and

a lock nut including an inner thread for engaging with said outer thread of said handle and for engaging with said at least two weight members after said at least two weight members have been engaged onto said handle and after said at least two weight members have been disengaged from said narrowed neck segment of said handle, in order to retain and secure said at least two weight members to said handle.

2. The adjustable dumbbell as claimed in claim 1, wherein said handle includes a casing secured to each of said base plates.