Patent ID: 8506461
Filing Date: 2013-08-13
Classification: A63B

Abstract:
1. A multifunction dumbbell comprising: a handle comprising two projections on both ends respectively; two hollow weight members each comprising a protrusion extending toward the handle; two spacer sleeves each comprising a closed flange fixedly secured to a joining portion of the handle and one of the two projections, with the two spacer sleeves fixedly fastened between the protrusions of the two hollow weight members and the two projections; two rings each having an inner diameter less than an outer diameter of each of the two hollow weight members, wherein the two rings are capable of placement on the two hollow weight members and retained thereon respectively; two half-spherical members fixedly secured to the two rings respectively and each comprising a concave inner surface shaped to complimentarily engage with one of the two hollow weight members; and two truncated conic springs put on the protrusions and portions of the two hollow weight members to be retained between the two spacer sleeves and the two rings respectively, wherein the two rings and the two half-spherical members together are adapted to rotate about the two hollow weight members.