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View Full Version : My Attempt at a Fully Adjustable Mesh Seat Mounting on my Aurora



RV3maker
02-16-2015, 11:53 PM
Hello fellow AZ's, been awhile, but I am back at finishing up my Aurora delta for my wife. I posted on my seat mesh, which ended up turning out pretty good . . .how it holds up is yet to be seen. My next challenge with the seat was the ability to adjust it in every which way but loose! I have ridden recumbents for several years now, including trikes and LWB, but my wife is completely new to it and she is almost certainly going to go through several rounds of "it just doesn't feel right" and "it feels funny" and so on and so forth . . ..I am prepared!

So, this I what I have come up with for a fully adjustable seat that I can move for her any way she wants (up/down, fore/aft, tilt). This is just the temp attachment that I have given the bounce test on and made her get in it and bounce on it quite a bit so I could see it move/flex. Held up pretty good! I went with the hell for stout BMX stem and used a fully adjustable stem for the front mount.

https://lh6.googleusercontent.com/-FU4ngUkvOZY/VOLAX19_pEI/AAAAAAAACso/_LZoBAsrX_c/w737-h553-no/20150216_212000_resized.jpg
https://lh6.googleusercontent.com/-WQg9PCK-NsY/VOLAXNhKB4I/AAAAAAAACsk/CF1zdze1KJY/w737-h553-no/20150216_211935_resized.jpg
https://lh4.googleusercontent.com/-lGPMp-dMhUE/VOLAZWBjFmI/AAAAAAAACs8/KitLDmo2zGA/w737-h553-no/20150216_212351_resized.jpg

The mounts for the stems are race car frame mounts (1.5") and I modified them a bit to be flat on top and welded sections of 1 1/8" steerer tube to the mount. These are STOUT and will not move, and surprisingly are not too heavy. The 3/8" bolts/nuts will get replaced with bushings and lighter 1/4" bolts on final assembly.

https://lh5.googleusercontent.com/-gXmNg95Bi0o/VOLAaGGTIEI/AAAAAAAACtA/gy-JjLJNG60/w737-h553-no/20150216_212404_resized.jpg
https://lh6.googleusercontent.com/-odHwJpekOcs/VOLAbbjflDI/AAAAAAAACtU/AbHlvI0Bg54/w737-h553-no/20150216_212418_resized.jpg

The other thing to do to the frame is to cut out the EMT tubing and weld in a couple proper diameter handle bar cross section pieces to make the stems even more rigid and eliminate the tendency to rotate (try to). I picked these up fairly cheap from Solid Bike Company. Great frame products including awesome headtubes of all sizes and styles. Here's a link, http://solidbikes.bigcartel.com/. I also have to mount two tabs on the back of the seat for the rear adjustable support.

https://lh4.googleusercontent.com/-fAwZGRTasvA/VOLAcdONuXI/AAAAAAAACtg/YwqbxBWe2Uw/w737-h553-no/20150216_220326_resized.jpg

Next steps are to get these welded up, fit the rear support bracket and then clean up the welds and paint the seat and reinstall the mesh.

Then on to the adjustable steering . . . . I will post that in the steering threads if anyone is interested. I hope this might help anyone considering an alternative to mounting a mesh seat . . . .more to follow!

Rob
RV3maker :wings:
Warrior - finished 3 years, have not had time to paint it https://plus.google.com/photos/107830944100278065441/albums/5781572831651723489
Aurora - in work https://plus.google.com/photos/107830944100278065441/albums/6054177765796192577
Tricruiser Prone - progressive experiment

Twinkle
02-17-2015, 07:18 AM
Nice ideas there -:)

might have been easier to make an electric chair ( oops :innocent: who said that )

regards emma

LongRider
02-17-2015, 09:00 AM
Fantastic innovation -- speaking of, why not open a thread on your tricruiser prone? Love to learn about that looks VERY interesting!

RV3maker
03-01-2015, 12:09 PM
Update.

Here the back mount is temporarily installed. I have the tabs welded on the seat upper cross bar and aluminum spacers cut. All-thread will be cut and nylock nuts installed on the top. The bushings through the seat tube riser are harbor freights aluminum rivnuts/nutserts. These are easy to installed and give a good flat surface on the outside for the aluminum tube spacers.

Still have to do the finish filing on the adjustable slotted standoffs, but pretty happy with them as they only took about 15 minutes to cut out on my wood band saw.

You can also see the handle bar stem inserts that I welded on to get the proper size bar for the stems to ensure a tight bottom mount(s).

https://lh6.googleusercontent.com/-EFipHISXknU/VPI0A--n4jI/AAAAAAAACuk/7751RrB9z-c/w709-h532-no/20150223_202422_resized.jpg

https://lh3.googleusercontent.com/-3nhMIhRoqHw/VPNGV52xJdI/AAAAAAAACwk/5qvlbBX4yAc/w709-h532-no/20150301_105820_resized.jpg

Coming along!

Rob
RV3maker :wings:
Warrior - finished 3 years, have not had time to paint it https://plus.google.com/photos/10783...72831651723489 (https://plus.google.com/photos/107830944100278065441/albums/5781572831651723489)
Aurora - in work https://plus.google.com/photos/10783...77765796192577 (https://plus.google.com/photos/107830944100278065441/albums/6054177765796192577)
Tricruiser Prone - progressive experiment

jonvalt
05-19-2017, 02:52 PM
Does anyone know where one would get the 1.5" race car frame mounts the OP is talking about here? My searches for "race car frame mounts" "race car chassis mount" etc. have proved fruitless. Will also PM the OP.

Update: I can't PM him because his box is full.

Thanks.

LongRider
05-19-2017, 07:39 PM
I believe you are overthinking the problem -- you do not need anything fancy to mount a seat to a recumbent.

jonvalt
05-19-2017, 08:53 PM
It's been harder than I'd expect it to be. Hard to get one built and mounted to be tight and stable anyway.