as a relatively lightweight and stiff material an important aspect however is the whatever material is chosen the end product the frame 32 and stabilizers 34 must not be 34 whippy 34 that is to say the stabilized frame 32 must be able to extend essentially coplanar with little noticeable bending or drooping if the frame 32 were about five feet in length lifting the forward end up about 3 6 inches would effect an elevating of the front wheels 20 sufficient to adequately clear the ground for most terrain one can see however that if the frame 32 is too flexible the amount of lift required at the forward end of the frame 32 would become excessive moreover a too flexible frame could effect an oscillatory bouncing action back at the wheelchair due to the walking action of the attendant as he pulled the wheelchair along with a properly stiff enough frame 32 the attendant can push down on the forward end to pivot the wheelchair about its front wheels 20 to elevate the rear wheels 16 off the ground such as might be required to pull the wheelchair up over a curbing or some other obstacle in certain instances a wheelchair occupant may desire that there be no obstructions in front of him this might be the case if the occupant were fishing hunting skeet or trap shooting bird watching attending a sporting event and so forth in those situations the pulling frame 30 fig1 or 130 fig4 might interfere with the viewing or the activity that engages the wheelchair occupant on might just simply remove the frame and take it apart and temporarily store it for later re attachment.