Adjustable Whale tail seat - 2nd attempt

Last crawled date: 1 year, 10 months ago

I'm happy to give you this adjustable version of my previous seat.
It is design to fit well with the current anchors present in your kayak bodies.

My design seems to be dark but I prefered spending time to find a mecanical solution rather than create powerful and colorful renderings.

The most expensive parts are the stainless steel tubes but it can maybe be replaced by a Zinc coated steel.
The four bended tubes are the same and the four straight tubes are the same too.
Adjusting to the Kayak body seems to be easy. There are a lot of combinaisons.

Adjustable to the kayak body:
You can see on animated pictures, its abilities to catch the current shoulders.
The only part which must be adjusted to the kayak body shape is the part who touch it near the twin adjusting screws.
I ensured the compatibility with a sprayskirt (the backrest touches it but it is very round and non aggressive for it).

Comfort and adjusting to the consummer's body:
Based on an ergonomic rotomolded PEHD shape, it can also easily be covered by a customisable tissu cover made from something like foam or silicon gel (non drawn).
The backrest is pushed forward by a spring and the backward bending is limited by an adjstable touching screw.
The incremental tuning of the tubing structure allows you to manage the elevation and the inclinaison of the seat.
You can modify the length of the tubes by choosing an another hole for each pin. Different technical solutions are possible like eccentric flange used on bikes.

Strong enough:
A deeper study should be done to ensure that all of the parts strength is ok but I verified the most important thing.
The steel structure is well designed and should resist up to 100kg load (see FEM post treatment picture).
Upper screws allow you to manage the inclinaison of the tubes and their tension, associate to an appropriate friction coefficient, permit to create a local clamp.
The choice of the material and the roughness of the interface is critical for the product. It is possible to use little radial grooves to improve the efficiency in this way.

Mass:
2.95 kg

Material:
Seat and backrest rotomoulded from PEHD. Stainless steel 316L (or equivalent like Zinc coated steel) tubes are included during the process (see the cut)
I took
E=1000 MPa
µ=0.46
Rp0.2=25 Mpa Max

Little plastic parts are made from massive rigid thermoplastic.
A few standard mecanical supplies.

Tubing Structure is made from stainless steel 316L or equivalent and have to resist to the corrosion (zinc coated steel could be convenient).
I took
E=200 000 MPa
µ=0.266
Rp0.2=500 MPa

Don't hesitate to ask me some questions at this address:
PSX59@Apprendre-la-CAO.com
www.Apprendre-la-CAO.com