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Tension Adjustable By Bungee

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  • Tension Adjustable By Bungee

    Although I think TiLite makes some of the best back upholstery out there, I wasn't willing to pony up the additional $105 SportAid charges for tension adjustable by straps back upholstery (TiLite's MSRP=$150). The only difference between it and the standard "Velcro adjustable" upholstery are a few D loops and Velcro straps between the two backrest ears. Without those straps on a relatively low back (12"), however, the top of the upholstery did not provide the degree of support I wanted. Since TiLite's backrest ears are fairly wide and relatively thick, I took a soldering iron and poked a row of holes along the inner edge of each ear, then laced some black mini-bungee cord though the holes.


    Not only does the upper half of my backrest provide excellent support, the added tension/elasticity keeps the ears from sliding on the back post and gives ever so slightly if I lean back into it. It is very comfortable.
    Last edited by SCI-Nurse; 08-15-2007, 09:03 PM.


  • #2
    Good idea, I now have a project this weekend.

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    • #3
      That indeed is a good idea.
      May 2000, T4-5 Complete.

      Nam-Myoho-Renge-Kyo

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      • #4
        Update

        While pics will follow, I also eliminated the three straps below the backrest ears and replaced them with two more bungee cords which were the same diameter and the one in this pic, mv back height is 12", so the lower straps provided minimal support anyway. Getting the straps off of the back posts also made the back fold down more-easily.

        After increasing the wheel spacing by 1/8" on each side, and adding a 1/8" shim from ABS plastic to insert between the aluminum side guard and its mounting post, and removing the lock washer used with the small button head screw used to set the back angle, I can now fold the backrest down without removing the side guards.
        Last edited by SCI_OTR; 08-21-2007, 12:10 AM.

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        • #5
          You might want to put metal grommets in, instead of just using the fabric. The pressure of the bungee cords would otherwise rip big holes in the fabric, I would think.

          Raccoon
          4/6/97, car accident, C5. http://raccoon-kathleen.blogspot.com/

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          • #6
            Originally posted by Raccoon
            You might want to put metal grommets in, instead of just using the fabric. The pressure of the bungee cords would otherwise rip big holes in the fabric, I would think.

            Raccoon
            Those backrest ears are thick, and the loop Velcro on the back pad which attaches to the hook Velcro of the ears takes a great deal of stress off the bungee. After all, TiLite uses this upholstery, sans bungee cord, as the standard upholstery on most TiLite chairs. They evidently feel that they use enough Velcro on the straps, backrest ears, and back upholstery that it should hold its own.

            I do believe you have a valid concern about this the holes tearing/stretching if this modification were attempted on chairs which use other adjustable tension upholstery designs.

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            • #7
              Originally posted by SCI_OTR
              Although I think TiLite makes some of the best back upholstery out there, I wasn't willing to pony up the additional $105 SportAid charges for tension adjustable by straps back upholstery (TiLite's MSRP=$150).
              Does anyone know if the TiLite back upholstery might fit the Quickie Ti?

              William

              ... rolling since 1989
              ...

              BE NICE!It's free

              P.S. ~ I have "handicapabilities"

              TWITTER: @MacBerry

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              • #8
                Originally posted by wheelchairTITAN
                Does anyone know if the TiLite back upholstery might fit the Quickie Ti?
                The flap of fabric below the padded portion of the upholstery attaches to Velcro which is sewn into the underside of the seat upholstery. Without that area of Velcro it may be difficult to match everything up for a clean appearance. It is also very expensive to buy the back upholstery from TiLite as individual parts.

                Quickie just released a different stye of adjustable upholstery on the GT which has more elasticity in the straps and has a neoprene type of cover. IMO it is better than their Jay Precision back upholstery.


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                • #9
                  Final Pics

                  Here are the pics of the completed tension adjustable by bungee backrest which folds down with the sideguards on.

                  - Replaced the Velcro straps below the backrest ears with two mini-bingee cords.

                  - I increased the rear wheel spacing by 1/8" on each side (to 1.25").

                  - Added a 1/8" ABS plastic shim between the aluminum side guard and the mounting post

                  - Removed the lock washer used with the small button head screw used to set the back angle (arrow).








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                  • #10
                    And you prefer this setup to, say, a Roho Low Profile Jetstream back because . . . ?
                    stephen@bike-on.com

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                    • #11
                      Thanks ...

                      Originally posted by SCI_OTR
                      The flap of fabric below the padded portion of the upholstery attaches to Velcro which is sewn into the underside of the seat upholstery. Without that area of Velcro it may be difficult to match everything up for a clean appearance. It is also very expensive to buy the back upholstery from TiLite as individual parts.

                      Quickie just released a different stye of adjustable upholstery on the GT which has more elasticity in the straps and has a neoprene type of cover. IMO it is better than their Jay Precision back upholstery.
                      Thanks Scott ... I will look into this. The bottom velcro straps seem to be the same set up as their old upholsetry.

                      William

                      ... rolling since 1989
                      ...

                      BE NICE!It's free

                      P.S. ~ I have "handicapabilities"

                      TWITTER: @MacBerry

                      Comment


                      • #12
                        Originally posted by stephen212
                        And you prefer this setup to, say, a Roho Low Profile Jetstream back because . . . ?
                        It's comfortable, portable, light, and cheap.

                        While this started out as a way to give the top edge of the upholstery more support, there turned out to be other advantages that were purely serendipity. They include:

                        - The backrest ears don't slide off the back post.

                        - The resilience of the bungee's allows the back pad to spring back providing better lumbar support and controlling posterior pelvic tilt.

                        - Because the lower straps are gone, I can now fold the back without removing the sideguards after only minor modifications.

                        Not bad for around $7.

                        Comment


                        • #13
                          Originally posted by SCI_OTR
                          It's comfortable, portable, light, and cheap.

                          While this started out as a way to give the top edge of the upholstery more support, there turned out to be other advantages that were purely serendipity. They include:

                          - The backrest ears don't slide off the back post.

                          - The resilience of the bungee's allows the back pad to spring back providing better lumbar support and controlling posterior pelvic tilt.

                          - Because the lower straps are gone, I can now fold the back without removing the sideguards after only minor modifications.

                          Not bad for around $7.
                          Sweet! Your post could not have come at a better time for me, as I am specing out a ZRA and had just decided to go with the strap adjustable back.

                          Where does one procure mini-bungee cord? A link would be much appreciated.

                          What keeps the lower two bungees in place vertically where they loop the posts? The original straps look as if they had Velcro tabs to attack to the back, obviously the bungees don't. Any issues there? What are the yellow things?
                          Foolish

                          "We have met the enemy and he is us."-POGO.

                          "I have great faith in fools; self-confidence my friends call it."~Edgar Allan Poe

                          "Dream big, you might never wake up!"- Snoop Dogg

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                          • #14
                            Originally posted by Foolish Old
                            I am specing out a ZRA and had just decided to go with the strap adjustable back.
                            Even though the chair had 3 straps below the backrest ears, my ZRc has the standard Velcro adjustable upholstery. The tension adjustable by straps version has D loops on one ear with corresponding Velcro straps sewn into the opposite ear to connect them.
                            Originally posted by Foolish Old

                            Where does one procure mini-bungee cord? A link would be much appreciated.
                            They are 12" "Ball Bungee" canopy tarp ties. I bought them at Home Depot for $5.97.



                            To get the ball off, I squeezed it in a vice until it cracked.

                            Originally posted by Foolish Old

                            What keeps the lower two bungees in place vertically where they loop the posts?
                            The bungee's black fabric covering sticks to the hook Velcro on the back upholstery.

                            Originally posted by Foolish Old
                            What are the yellow things?
                            There is a plastic sleeve on each canopy tie inside the ball. I used two of them on each bungee to reduce the gap between the portions of the loop on each side of the back posts so that the upholstery fits better.

                            Mind you I have a 12" high back, good trunk control, and do not put much stress on this area. The lower bungees would probably not provide enough support on a taller back or with a heavier cushion.
                            Last edited by SCI_OTR; 08-21-2007, 07:15 PM.

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                            • #15
                              Originally posted by SCI_OTR View Post
                              The flap of fabric below the padded portion of the upholstery attaches to Velcro which is sewn into the underside of the seat upholstery. Without that area of Velcro it may be difficult to match everything up for a clean appearance. It is also very expensive to buy the back upholstery from TiLite as individual parts.

                              Quickie just released a different stye of adjustable upholstery on the GT which has more elasticity in the straps and has a neoprene type of cover. IMO it is better than their Jay Precision back upholstery.


                              Does your back have holes for the back posts? The pictures look like fabric completely covers the back posts. My posts stick out about 1/2 to 1 inch and stabs me in the back...it really hurts. I'm fighting the place I got the chair about it now...I keep telling them there is no way quickie would do this...I must have a back for someone with a chair with handles.

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