| 摘要 |
An improved dumbbell exercise apparatus includes at least a pair of novel bullet-pocket configured weight plate members to be mounted in spaced end-wise relationship on a dumbbell bar, wherein each weight plate member is configured to include at least a pair of cylindrical pocket-like openings extending axially through the thickness dimension of the weight plates, respectively, in parallel and axially offset extension to each other, and at least a singular bullet-weight cylinder of conforming cylindrical dimension to the radius of an aligned singular cylindrical pocket opening in the weight plate, is selectively axially inserted into an aligned cylindrical pocket opening, in order to add or adjust weight to the weight plate, and novel locking means are provided to mount on the weight plate to prevent dislodging of the weight cylinder from the cylindrical opening during use of the dumbbell exercise apparatus. |
| 主权项 |
1. An improved bullet-pocket dumbbell apparatus including in combination, an elongated bar member providing oppositely disposed free-end portions and a central grip portion for manual lifting, at least a pair of bullet-pocket cylindrical shaped weight plates rotatable and attachable to the free-end portions of the bar member in axial alignment with the axial dimension of the bar member, each weight plate including at least a pair of cylindrical openings extending in through the length dimension of the weight plate in parallel alignment to each other and spaced parallel balanced alignment with the axial dimension of the weight plate, a peripheral aperture extending circumferentially on the weight plate intermediately along its axial length and opening into each of the cylindrical openings in the weight plates, flexible band means including an annular shaped flexible band member insertedly received into the peripheral aperture and correspondingly received into the cylindrical openings of the weight plates, respectively, at least a pair of bullet-shaped cylindrical insert weights insertable into the pair of cylindrical openings of the weight plates, respectively, each of the insert weights having a predetermined weighted mass, and including along an interior free-end portion when inserted in the cylindrical openings, first groove means provided in a selected annular direction across the interior circumferential edge of the free-end portion of the insert weight to define a partially extending radial groove having a shoulder portion and opposite end portions terminating into the adjacent cylindrical surface of the insert weight, the inserted flexible band member being extended within the cylindrical opening and being engaged by the insert weight when inserted into the cylindrical opening, the insert weight being selectively rotated to insert the flexible band member into the first groove means to be engaged by the shoulder portion thereof and with selective rotation of the insert weight, the flexible band member is removed by the camming action of a selected end portion of the first groove means to move the flexible band member from a first contracted position to an increased tension second contracted position when removed from the cylindrical opening, and second groove means provided in a selected annular direction across the medial length dimension of the insert weight to define a partially extending medial radial groove having predetermined depth dimension and a pair of opposite end portions terminating into the adjacent cylindrical surface of the insert weight, the rotatable insert weight being further selectively rotated in the cylindrical opening to align the flexible band member which is in the second contracted position thereof, with the aligned medial radial groove on the insert weight, to thereby receive the flexible band member therein when allowed to be restored to the first contracted position thereof, whereby aligning the flexible band member comprises locking means to secure the insert weight within the cylindrical opening of the weight plate, respectively. |
