초록 ▼

A dumbbell is provided which is collapsible for storage and/or convenient transportability and can be expanded, when required for purposes of exercising, by introduction therein of fluid such as water and sand. The dumbbell comprises a hollow, collapsible container comprising a closed loop of hollow

A dumbbell is provided which is collapsible for storage and/or convenient transportability and can be expanded, when required for purposes of exercising, by introduction therein of fluid such as water and sand. The dumbbell comprises a hollow, collapsible container comprising a closed loop of hollow tube having an elliptical or doughnut shape, a hollow handle traversing the gap between the inner walls of the closed loop and a fluid inlet provided with a plug seal. The outer peripheral wall of the closed loop is provided with accordion pleats biased into the closed portion but expandable against the bias under the influence of pressure generated by introduction of fluid into the container. The amount of fluid so introduced is a matter of choice of the user to achieve the desired overall weight of the device. Advantageously the dumbbells are integrally molded from thermoplastic resin.

대표청구항 ▼

A dumbbell which is collapsible for storage and expandable upon introduction of fluid therein, said dumbbell comprising in combination: a doughnut-shaped collapsible tubular container for receiving fluid; a hollow handle traversing the inner ring of said doughnut-shaped container and attached at eit

A dumbbell which is collapsible for storage and expandable upon introduction of fluid therein, said dumbbell comprising in combination: a doughnut-shaped collapsible tubular container for receiving fluid; a hollow handle traversing the inner ring of said doughnut-shaped container and attached at either end to the wall thereof; the interior of said handle being in direct fluid receiving communication at either end thereof with the interior of said container; the outer peripheral wall of said container being formed into accordion pleats resiliently biased into the folded position but expandable against said bias under the influence of pressure generated solely by introduction of fluid into said container to vary the volume of said container to accommodate said fluid and permit variation of the weight of said dumbbell without introducing significant amounts of air into said container; an inlet port in the wall of said container; and removable plug means for sealing said inlet port.