Weight lifting apparatus
US5284463A · kind A · utility
Inventor
Key dates
| Filing date | Apr 30, 1993 |
| Grant date | Feb 8, 1994 |
| Priority date | — |
| Expiry date | Apr 30, 2013 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63B21/00065
- WIPO fieldFurniture, games
- WIPO sectorOther fields
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.