Elevating wheel chair seat

Claim 1

AN ELEVATING SEAT FOR A WHEEL CHAIR OR THE LIKE COMPRISING A SEAT MEMBER, A PAIR OF STRAP MEANS HAVING ONE OF THEIR ENDS ENGAGING OPPOSITE EDGES OF SAID SEAT MEMBER, A PAIR OF ROLLER MEANS SUPPORTED BY THE WHEEL CHAIR ABOVE NORMAL SEAT HEIGHT OF SAID CHAIR, A PAIR OF ROTATABLE SHAFTS SUPPORTED BY SAID WHEEL CHAIR BELOW NORMAL SEAT HEIGHT, ONE OF SAID ROTATABLE SHAFTS INCLUDING AN INNER STATIONARY SHAFT, A HOLLOW, OUTER CONCENTRIC SHAFT ROTATABLE RELATIVE TO SAID STATIONARY SHAFT, AND COIL SPRING MEANS INTERCONNECTING SAID STATIONARY AND SAID CONCENTRIC SHAFTS, SAID STRAP MEANS BEING SUPPORTED BY SAID ROLLER MEANS TO SUSPEND THE SEAT MEMBER THEREBELOW AND SAID STRAP MEANS PASSING OVER SAID ROTATABLE SHAFTS WITH THE OPPOSITE ENDS THEREOF ANCHORED TO SAID OUTER CONCENTRIC SHAFT, AND LATCH MEANS FOR ENGAGING SAID OUTER CONCENTRIC SHAFT TO PREVENT ROTATION THEREOF WHEREBY UPON RELEASE OF SAID LATCH MEANS SAID SEAT WILL ELEVATE UNDER ROTATION OF SAID OUTER CONCENTRIC SHAFT BY SAID SPRING MEANS WHEN NO LOAD IS PRESENT AND REWIND SAID SPRING MEANS WHEN LOAD IS APPLIED TO SAID SEAT.