1991-05-30
1992-02-25
Bahr, Robert
Undertaking
272117, A63B 21072
Patent
active
050906933
ABSTRACT:
A dumbbell comprising a handlebar having two joints at two opposite ends for mounting a plurality of pairs of weights, wherein said joints have each an inner thread and an outer thread; said weights include a pair of first weights, a pair of cover weights and at least one pair of auxiliary weights. Each first weight has a stepped bolt hole through the central axis thereof which includes a first bolt hole at one end and a second bolt hole at an opposite end respectively made in size equal to the outer thread and the inner thread on each joint. Each auxiliary weight has a screw rod at one end in outer diameter equal to the inner thread on each joint and a bolt hole at an opposite end in inner diameter equal to the inner thread on each joint. Each cover weight has a screw rod at one end in size equal to the screw rod on each auxiliary weight. By connecting the first weights, the auxiliary weights or the cover weights to the handlebar, the dumbbell is arranged into any of a variety of forms.
REFERENCES:
patent: 937225 (1909-10-01), Burr
patent: 1536048 (1925-05-01), Plastalo
patent: 1991520 (1935-02-01), Postl
patent: 4076236 (1978-02-01), Ionel
patent: 4566690 (1986-01-01), Schook
patent: 4638994 (1987-01-01), Gogarty
patent: 4681315 (1987-07-01), Yang
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