Hydraulic exercise device with work measurement
US4979735A · kind A · utility
Inventor
Key dates
| Filing date | Aug 1, 1988 |
| Grant date | Dec 25, 1990 |
| Priority date | — |
| Expiry date | Aug 1, 2008 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63B21/008
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A device is disclosed which provides a work load for exercise machines, and directly measures the work performed. It comprises a liquid pump, linked by a power transmission to an exercise mechanism, producing a flow rate proportional to the exertion rate. The output liquid volume is determined either by observing its level in a transparent container, or via a flow meter. Direct work measurement is assured by making the liquid flow itself the source of resistance for the exercise. This is done via measurement of the pumping force and calibration of the flow restrictions. Work load adjustment devices which maintain a constant ratio of work rate to flow rate are described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.