초록 ▼

A weight-adjustable dumbbell includes a dumbbell shell unit, a weight unit, and an insert pin unit. The dumbbell shell unit includes a shell body confining a receiving space, and a weight selector rod connected to the shell body, extending into the receiving space, and formed with through holes regi

A weight-adjustable dumbbell includes a dumbbell shell unit, a weight unit, and an insert pin unit. The dumbbell shell unit includes a shell body confining a receiving space, and a weight selector rod connected to the shell body, extending into the receiving space, and formed with through holes registered with insert holes in the shell body. The weight unit is extended removably into the receiving space via an open bottom of the shell body, and includes a base member provided with two positioning posts, and weight pieces stacked on the base member. Each weight piece is formed with a rod hole for extension of the weight selector rod, and two post holes for extension of the positioning posts. The insert pin unit includes an insert pin inserted removably into a selected insert hole and extending removably through a corresponding through hole in the weight selector rod.

대표청구항 ▼

What is claimed is: 1. A weight-adjustable dumbbell comprising: a dumbbell shell unit including a hollow shell body confining a receiving space, and having a top shell portion with an inner side that faces said receiving space, and an outer side opposite to said inner side, said shell body further

What is claimed is: 1. A weight-adjustable dumbbell comprising: a dumbbell shell unit including a hollow shell body confining a receiving space, and having a top shell portion with an inner side that faces said receiving space, and an outer side opposite to said inner side, said shell body further having an open bottom shell portion opposite to said top shell portion in a vertical direction, a weight selector rod having a top rod end connected to said top shell portion, extending downwardly from said inner side of said top shell portion into said receiving space of said shell body, and formed with a plurality of through holes spaced apart from each other in the vertical direction, said shell body being formed with a plurality of insert holes, each of which is registered with a respective one of said through holes in said weight selector rod, and a handle connected to said outer side of said top shell portion; a weight unit extended removably into said receiving space via said bottom shell portion of said shell body, said weight unit including a base member provided with a pair of upwardly extending positioning posts, and a plurality of weight pieces stacked on said base member, each of said weight pieces having top and bottom sides, a rod hole formed through said top and bottom sides for extension of said weight selector rod, and a pair of post holes formed through said top and bottom sides for extension of said positioning posts, respectively, said bottom side of each of said weight pieces being formed with a first slot registered with a corresponding one of said through holes in said weight selector rod and a corresponding one of said insert holes in said shell body; and an insert pin unit including an insert pin inserted removably into a selected one of said insert holes in said shell body, extending along said first slot in said bottom side of one of said weight pieces corresponding to the selected one of said insert holes, and extending removably through one of said through holes in said weight selector rod corresponding to the selected one of said insert holes such that, when said dumbbell shell unit is lifted relative to said base member, said one of said weight pieces is moved together with any other of said weight pieces disposed thereabove and said shell body away from said base member. 2. The weight-adjustable dumbbell as claimed in claim 1, wherein said inner side of said top shell portion of said shell body is formed with a pair of positioning grooves, and each of said positioning posts has a top end part removably extended into a respective one of said positioning grooves. 3. The weight-adjustable dumbbell as claimed in claim 2, wherein said top end part of each of said positioning posts is dome-shaped. 4. The weight-adjustable dumbbell as claimed in claim 1, wherein said base member includes a base block from which said positioning posts extend. 5. The weight-adjustable dumbbell as claimed in claim 1, wherein said top side of each of said weight pieces is provided with a pair of guide flanges each disposed around a respective one of said post holes, and said bottom side of each of said weight pieces is provided with a pair of guide recesses each disposed around a respective one of said post holes, said guide recesses in an upper one of said weight pieces receiving said guide flanges of a lower one of said weight pieces and guiding extension of said positioning posts through said post holes. 6. The weight-adjustable dumbbell as claimed in claim 1, wherein said insert pin unit further includes a spring-loaded tumbler provided on said insert pin. 7. The weight-adjustable dumbbell as claimed in claim 1, wherein said shell body is generally ball-shaped, and said handle has opposite ends connected to said shell body. 8. The weight-adjustable dumbbell as claimed in claim 1, wherein said top side of each of said weight pieces is formed with a second slot parallel to said first slot. 9. The weight-adjustable dumbbell as claimed in claim 1, wherein said shell body has an outer surface provided with weight indicia at positions corresponding to said insert holes.