Weight lifting apparatus

Exercise devices – User manipulated force resisting apparatus – component... – Utilizing weight resistance

Patent

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Details

A63B 21072

Patent

active

052844633

ABSTRACT:
The apparatus is configured as a dumbbell having an elongated hollow lifting bar with a pivotable handle for activating a wedge-shaped cam element mounted to the bar. The cam element longitudinally forces two rods carried in a passageway of the bar to move pin operator elements of each weight. Opposed sides of a weight respectively include a depression or cavity and a laterally extending boss with a boss of one weight fitting within a depression of an adjacent weight. Each boss carries a pair of diametrically opposed inwardly biased pins that are moved outwardly by the element to engage a grooved surface in the depression on an adjacent weight to secure the weights together. Oversized bar alignment rings with essentially identical grooved surfaces are engaged by the pins of a first weight in a series. A support base having a pair of convergent channels to accommodate the alignment rings guides the dumbbell into its resting place. The weights are maintained in movable weight carriers by a spring-loaded weight positioning element to prevent movement of selected adjacent weight carriers when the weights are being secured together.

REFERENCES:
patent: 4076236 (1978-02-01), Ionel
patent: 4566690 (1986-01-01), Schook
patent: 4638994 (1987-01-01), Gogarty
patent: 4822034 (1989-04-01), Shields
patent: 4913422 (1990-04-01), Elmore et al.
patent: 4955603 (1990-09-01), Belker
patent: 5024434 (1991-06-01), Smith

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