Whebl chair

Abstract

Abstract 1. A WHEEL CHAIR CAPABLE OF TRAVELLING ON INCLINED IRREGULAR SURFACES COMPRISING A PAIR OF SIDE FRAME DEFINING A SEAT THEREBETWEEN, EACH OF SAID SIDE FRAMES COMPRISING: GUIDE MEANS, AND ENDLESS BELT ON SAID GUIDE MEANS AND HAVING AN UPPER RUN AND A LOWER RUN, THE LOWER RUN OF SAID ENDLESS BELT DEFINING A GENERALLY V-SHAPED PATH FROM A FRONT END IN FRONT OF THE SEAT TO A REAR END BEHIND THE SEAT, A MAIN WHEEL ROTATABLY MOUNTED ON THE SIDE FRAME AND MOVABLE AT LEAST BETWEEN A RAISED POSITION ABOVE THE SAID LOWER RUN AND A LOWER POSITION WHEREAT THE BOTTOM OF THE WHEEL IS POSITIONED BELOW THE SAID LOWER RUN FOR ENGAGING THE GROUND, AND A REAR LEG HAVING A REAR WHEEL MOVABLE AT LEAST BETWEEN A RAISED POSITION ABOVE THE LOWER RUN AND A LOWER POSITION SUFFICIENTLY FAR BELOW THE LOWER RUN SUCH THAT THE CHAIR IS UPRIGHT WHEN THE REAR WHEEL IS LOWERED, AND WHEREIN, WHEN THE MAIN AND REAR WHEELS ARE IN THEIR RAISED POSITIONS, THE REAR PART OF THE V-SHAPED LOWER RUN ENGAGES THE GROUND, MEANS FOR DRIVING THE ENDLESS BELT ABOUT ITS GUIDE MEANS, A HYDRAULIC SHOCK ABSORBER MEANS OPERATIVELY ASSOCIATED WITH SAID SIDE FRAME FOR MOVEMENT BETWEEN A RAISED POSITION ABOVE THE LEVEL OF THE LOWER RUN AND A LOWER POSITION BELOW THE LOWER RUN, SAID SHOCK ABSORBER MEANS COMPRISING A BAR EXTENDING FORWARDLY ALONG THE REAR PART OF THE V-SHAPED LOWER RUN FROM A PIVOT CONNECTION WITH THE SIDE FRAME, SUCH THAT WHEN THE WHEEL CHAIR IS SUPPORTED ON THE SAID REAR PART OF THE LOWER RUN FOR MOVEMENT ALONG A SURFACE ONTO A DOWNWARD INCLINE, SAID BAR IS PIVOTABLE ABOUT SAID PIVOT CONNECTION TO ITS LOWER POSITION TO ENGAGE THE INCLINED SURFACE BEFORE THE CHAIR TIPS OVER A SUFFICIENT AMOUNT FOR THE SAID REAR PART OF THE LOWER RUN TO ENGAGE THE INCLINE, A RETAINING MEANS FOR HOLDING THE BAR IN ITS RAISED POSITION AND A SPRING MEANS FOR URGING THE BAR TO ITS LOWER POSITION WHEN THE RETAINING MEANS IS RELEASED, A DAMPING MECHANISM PERMITTING MOVEMENT OF THE BAR DOWNWARDLY AWAY FROM THE LOWER RUN UNDER THE ACTION OF THE SPRING MEANS AND RESTRICING MOVEMENT OF THE BAR UPWARDLY TO ITS RAISED POSITON, SAID DAMPING MECHANISM INCLUDING A HYDRAULIC PISTON AND CYLINDER UNIT OPERATIVELY CONNECTED TO THE SIDE FRAME AND TO THE BAR, A FLUID RESERVOIR, AN OPEN PASSAGE FROM ONE END OF THE CYLINDER TO THE RESERVOIR TO PERMIT FREE PASSAGE TO FLUID THEREIN AS THE BAR MOVES TO ITS LOWER POSITION, AND TWO FLUID LINES LEADING FROM THE RESERVOIR TO THE OTHER END OF THE CYLINDER, ONE OF SAID TWO LINES BEING A RESTRICTED PASSAGE AND THE OTHER HAVING A ONE-WAY VALVE PERMITTING FLUID TO FLOW ONLY FROM THE RESERVOIR TO THE CYLINDER, WHEREBY WHEN THE BAR IS LOWERED, LIQUID FLOWS FROM THE RESERVOIR THROUGH THE ONE-WAY VALVE TO THE CYLINDER, AND WHEREIN DURING RAISING OF THE BAR, LIQUID FLOWS THROUGH THE RESTRICTED PASSAGE TO THE RESERVOIR.

Inventors

No inventors recorded.

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