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ZRA Frog Legs Forks: Seat Depth / CBTF

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    #16
    Here you go:
    /forum/showthread.php?t=144483
    Max inflation 85lbs. I have a new set of 8 inch pneumatics which only have 35 lbs max inflation and they are tight. So I think you could easily adjust these expensive babies to suit.
    I have had periodic paralysis all my life. I lost my ability to walk in 2011 beginning with a spinal block, which was used for a hip fracture caused by periodic paralysis.

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      #17
      Originally posted by amyk View Post
      ... i have frogslegs forks on my tr2 and none on my backup chair, which is a kuschall champion (i have demo yamaha jwx1 wheels on it currently, which get plenty of outdoor use). they definitely do nothing for cobblestones. the elastomers are meant to deal with vibration, and are not enough to cope with the kind of travel you get from cobblestones, which might be 1cm up and down, every 5cm.... trust me, we have enough here (ireland) and while icon-style suspension would be different, elastomers do nothing. pushing or being pushed across cobblestones is a quick road to a scrambled brain, or so it feels, and your husband will be shaken around on cobblestones as much with fl forks as without them. save your money/goodwill.

      what does make a fairly huge difference is a set of fl softroll castors. the material aspect is one benefit, but its the curved shape that makes the biggest difference to obstacles like cobblestones. they tend to keep rolling forwards, up and over obstacles, rather than jamming and bringing you to a sharp stop.

      im in the middle of speccing a new tr3 for myself, and i definitely wont bother with the fl forks. it might be different if i were solely interested in fine vibration control. ...
      Very, very interesting.

      Since you're into cobble, I wonder how a FreeWheel would smooth-out the cobblestone experience?

      Might severe, continuous impact and twist be too much for the 1" wide footrest clamp?

      Just curious, as clamp-aside, lifting casters out of the equation and suspending the chair on 3 points really improves my occasional forays over a local, cobbled street.

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        #18
        You won't believe this Amyk, but I had just written you a reply, and also lost it. This thread must be jinxed!

        I appreciate your input, especially your knowing what the everyday environment is like. Bumps from cobblestones are definitely our biggest motivation for Frog Legs forks, but also vibration (he gets seizures from both bumps and vibrations). We are already getting the FL soft rolls 5"x1.4" which will hopefully help.

        The issue I have now is that we can get the funding for the Frog Legs forks. If we don't take them, we loose them. Are there any other products out there that go further than the FL forks for adjustability and dampening on bumps on a TiLite ZRA? I can not find any.

        Unless I am dreaming and/or stupid (probably both), I don't understand why there is nothing like the front shocks available in the bicycle industry for wheelchairs. For example, in my simple mind, something like a RockShox adjustable air shock with a remote actuator/lock-out would be perfect for a wheelchair (with uni-control remote of course).

        Via via I may be in contact with someone from SRAM who make them. Here is a picture of the RockShox SID XX, along with a video http://www.youtube.com/watch?v=jX6DYNCrYjs:
        Last edited by elarson; 9 Jan 2013, 6:24 PM. Reason: made smaller image
        Partner of an incredible stroke survivor. Limitations: hemiparesis and neglect (functional paralysis and complete lack of awareness on one side). Equipment: TiLite ZRA 2 and 2GX, Spinergy ZX-1, RioMobility Firefly. Knowledge: relative newbie for high-level equipment (2012), but willing to try to help others who are new with similar limitations (definitely not a guru, but inquisitive).

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          #19
          I think you are referring to this in that post by Toto? I fear not in our budget or my maintenance wishes.
          Originally posted by nonoise View Post
          Here you go:
          https://www.carecure.net/forum/showthread.php?t=144483
          Max inflation 85lbs. I have a new set of 8 inch pneumatics which only have 35 lbs max inflation and they are tight. So I think you could easily adjust these expensive babies to suit.
          Partner of an incredible stroke survivor. Limitations: hemiparesis and neglect (functional paralysis and complete lack of awareness on one side). Equipment: TiLite ZRA 2 and 2GX, Spinergy ZX-1, RioMobility Firefly. Knowledge: relative newbie for high-level equipment (2012), but willing to try to help others who are new with similar limitations (definitely not a guru, but inquisitive).

          Comment


            #20
            Originally posted by nofuss View Post
            Very, very interesting.
            Since you're into cobble, I wonder how a FreeWheel would smooth-out the cobblestone experience?
            FreeWheel is excellent on this because of its large diameter and width.
            For elarson's husband, it would not work though because he cannot have fixed footrest as he is foot propelling too but there are alternatives that attach to the frame that would work.

            Your idea to take caster wheels out of the equation made me think again to the ZX1 in wheelie position, I remember also a video of a project where the power chair had 2 positions one for indoor using casters and one for outdoor tilting backward to lift up casters and roll on 4 rear wheels.
            My TR3

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              #21
              the freewheel would definitely be a possible solution to dealing with cobblestones. it might be possible to fabricate an attachment that would work with flip-up footrests - maybe using clamps onto the (still rigid) front, similar to how a dragonfly attaches.
              sorry, no experience and dont know any more.

              there are several different types of wheelchair 'suspension' most of which have nothing to do with actual suspension. elastomers and springs are somewhat effective at absorbing fine vibrations like maybe the grout between marble tiles at a shopping mall, but will do nothing when you go outside and are faced with a 1cm at the start of a flagstone, or the ridges on a boatdock... and so on... for those, softroll or pneumatic castors would help - are you planning on getting antippers?

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                #22
                wow--those are some rough streets!

                The ZX1 video looks great when it is used on smooth surfaces and up and down an occasional bump but would be a bit concerned about ZX1/wheelchair performance/durability on this stuff. You mentioned that 50% of the time will be outdoors including time on these cobblestone surfaces. How much of the outdoor time do you estimate will be on these beautiful but miserable to negotiate roads/walks?
                I don't have an SCI--I have generalized weakness (PPMS) with POTS and gait problems.

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                  #23
                  Thank again for your input Amyk. We are definitely getting anti-tips.

                  The bumps we have even in our house are more than your average "mall grout" -- hundreds of years old wood floors and uneven terra cotta tiles.

                  Good idea about looking into the freewheel. We had previously discounted it because of the flip-up footrests. I've asked Patd about attachment possibilities.

                  Yeah, I am probably looking for the impossible, getting over those horrible 1 cm slams and pitches from the chair. I may have a word with Frog Legs about this picture on their web page.
                  Partner of an incredible stroke survivor. Limitations: hemiparesis and neglect (functional paralysis and complete lack of awareness on one side). Equipment: TiLite ZRA 2 and 2GX, Spinergy ZX-1, RioMobility Firefly. Knowledge: relative newbie for high-level equipment (2012), but willing to try to help others who are new with similar limitations (definitely not a guru, but inquisitive).

                  Comment


                    #24
                    I have froglegs on one of my chairs and it is useless on streets like that. Every time a stone is a little higher than the rest, the chair stopps and I am falling fareward off the chair. So I have stopped using that chair. And they makes the curbs difficult to go up.

                    On my other chair I have softrolls and usual forks and it is working much better. At least the chair is not bending foreward when I wheel in a high stone.
                    TH 12, 43 years post

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                      #25
                      Wow, thank you Tauble, and the others that have, for really looking into this post. Luckily, probably only about 10-20% of the 50% outdoors will be on the really rough streets. The problem is, you often don't know until you get to them. Done that before, made sure the restaurant/hotel was accessible, only to find out the street was a "seizure minefield" (no offense to those who have dealt with real minefields).
                      Partner of an incredible stroke survivor. Limitations: hemiparesis and neglect (functional paralysis and complete lack of awareness on one side). Equipment: TiLite ZRA 2 and 2GX, Spinergy ZX-1, RioMobility Firefly. Knowledge: relative newbie for high-level equipment (2012), but willing to try to help others who are new with similar limitations (definitely not a guru, but inquisitive).

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                        #26
                        I have a K├╝shall chair with suspension under my chair or I wouldn't have survieved
                        TH 12, 43 years post

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                          #27
                          Maybe NASA has a spare Mars Rover you could use.

                          Seriously, I have a much better appreciation for the myriad problems that you and your husband have been sorting through and am humbled by your positive attitudes and perseverance.
                          I don't have an SCI--I have generalized weakness (PPMS) with POTS and gait problems.

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                            #28
                            i have sensation and movement, so my way through cobbles/rough surfaces is usually to lift my feet above the footplate, 'lock' my knees as much as i can, and blunder through without stopping. i can only do this with the softrolls, with my old standards on my kuschall (1.5" hard plastic, square edged) i would stop every foot or so and have to restart. if i try to speak while blundering, it comes out sounding like im sitting on a washing machine. h.h.h.h.e.l.l.l.l.l.o.o.o.o.m.y.y.n.n.n.a.a.a.m.m. m.m.e.i.s.s.s.a.a.a.a.m.m.y.y.y.

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                              #29
                              Thanks Woman from Europe, you and many others are convincing me that they just probably aren't going to to work for what we intended, and are going to add difficulty in transfers, and make the chair too forward tippy [see Specs for a ZRA2 with flip-up footrests (DU 100082)].

                              I just left a message for my brother, who was previously the head of engineering at the company I mentioned a few posts ago #18, to see what he might be able to rig up for us. I hate being the pain in the butt little sister. Unfortunately, we won't be able to use the funding we would get from the government for the FL forks for that, but I don't think there are any other viable solutions at this time.

                              It's kind of funny, when we started the project of a new wheelchair, FL forks was one of the few things I felt sure of. Oh well... I hope a few of you who already cautioned me are reading this. In the words of one of my old UK friends “I am as green as I am cabbage looking”.
                              Partner of an incredible stroke survivor. Limitations: hemiparesis and neglect (functional paralysis and complete lack of awareness on one side). Equipment: TiLite ZRA 2 and 2GX, Spinergy ZX-1, RioMobility Firefly. Knowledge: relative newbie for high-level equipment (2012), but willing to try to help others who are new with similar limitations (definitely not a guru, but inquisitive).

                              Comment


                                #30
                                Originally posted by amyk View Post
                                i have sensation and movement, so my way through cobbles/rough surfaces is usually to lift my feet above the footplate, 'lock' my knees as much as i can, and blunder through without stopping. i can only do this with the softrolls, with my old standards on my kuschall (1.5" hard plastic, square edged) i would stop every foot or so and have to restart. if i try to speak while blundering, it comes out sounding like im sitting on a washing machine. h.h.h.h.e.l.l.l.l.l.o.o.o.o.m.y.y.n.n.n.a.a.a.m.m. m.m.e.i.s.s.s.a.a.a.a.m.m.y.y.y.
                                That is too funny.
                                I don't have an SCI--I have generalized weakness (PPMS) with POTS and gait problems.

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