Wheeled carriage having auxiliary wheel spaced from center of gravity of wheeled base and cam apparatus controlling deployment of auxiliary wheel and deployable side rails for the wheeled carriage
US6256812A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 15, 1999 |
| Grant date | Jul 10, 2001 |
| Priority date | — |
| Expiry date | Jan 15, 2019 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61G7/0528
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A wheeled carriage for supporting a patient in a substantially horizontal position, the wheeled carriage has thereon a patient support having head and foot ends and a wheeled base supported by castered wheels. An auxiliary wheel and a wheel support structure therefor suspendedly mount the auxiliary wheel at its axis to the wheeled base at a distance L in a horizontal direction from the center of gravity of the wheeled carriage along the length of the wheeled base when the auxiliary wheel is engaged with the floor surface. A moment M.sub.mass is defined by the distance L multiplied by a force F.sub.mass, the force F.sub.mass being defined by the mass of the carriage or carriage and patient at the center of gravity. The moment M.sub.mass is greater at all times than a moment M.sub.force to prevent teetering of the wheeled carriage, where moment M.sub.force is defined by multiplying the height H by a force F.sub.max. The force F.sub.max is the force required to move the wheeled carriage. The height H is defined by the vertical distance between the axis of the auxiliary wheel and the relative height of the gripping location where the force F.sub.max is applied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.