Patent ID: 7731641

Claim:
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.