Revolutionary Meditation Bench

Contest Ended, Winner(s) have been selected.
Description:
A standard meditation bench made of wood gets a makeover. We are looking to create a fully-adjustable, lightweight, travel version of a wooden meditation bench for manufacture via injection molding (plastic). Here is a reference for what it usually looks like (not what we are making):

www.samadhicushions.com/Meditation-Bench-Seiza-Kneeling-Bench-p/C-564.htm

The bench consists of 2 legs, of the same size, 7.5 inches tall. Atop is a main sitting piece, which is at right angles to the legs and is 18 inches long and 7 inches deep. All parts are ½ inch thick, or thinner.

The bench needs to be able to support the weight of an adult.

The main sitting piece (piece “A” in the sketch) needs to be rotational such that it can be tilted forward in order to create an angled seating platform. This adjustment is to conform to the seating angle of the meditator to create comfortable sitting position. The piece must lock out once in place at the desired setting, in order to provide stability while sitting on it (aka it does not move).

The legs must also be retractable, such that they fold in towards the main sitting piece in some manner, in order to make the bench small and practical for travelling or storage. When folded, teethe assembly should ideally be no more than 1 inch thick.
Wants:
Will be evaluated on how comprehensively the design meets and achieves all of the technical aspects from the description above.
Don't Wants:
An incomplete design that does not properly address all elements, in a way that is actually manufacturable per injection moulding process.
Ask for Sample:
Supported file extensions: sldprt, x_t, igs, step
Software:
  1. SolidWorks
  2. Pro/Engineer Wildfire
Additional Information
Please note that one of the main criteria for design is also the weight of the product. It is meant to be as light weight as possible, while supporting the functionality requirements. A perfect score on this point would be a weight of 1lb.

Entries

#1 TAB-1 by Jamal2techno
FOR REVIEW
more
2015-08-25 06:02:06
#2 Revolutinary Meditation bench by Nv
its is a model as per your requirements . it has adjustable angle of inclination for seating . it can be adjusted in 7 different levels. its fully made of plastic.
more
2015-08-25 15:13:27
#3 Revolutionary meditation bench by Nv
2015-08-25 15:16:11
#4 Foldable Meditation Bench by sldraftingdesign
Here is my submission for the bench. It is exactly 1" when folded up, has two positions of adjust-ability (an more and its just too steep), has a grab handle to carry while folded.
more
2015-08-26 20:07:03
#5 Zench - Meditation Bench by Pablo Gosso
Following the project brief I try to make the most simple design solution for its key features.
Shape design: This product is tool for meditation so its shape should follows its function with a simple and natural design. So I created its shape as a continuous surface that shows natural balance between function, strength and stability.
Feature design:The angle seat feature is key for its usage and generating complicated parts design was not the way to go. So I tried to find clever way to create this. The solution is simple and its part of the legs design without adding complex mechanism. It also allows adjustment according to user preference.
Folding Feature: I designed legs to be folded without losing strength in the hinge and to maximize the space beneath the seat for leg room.
Strength for adult support+transportability: I designed both seat and legs with a mix of Honeycomb structure ribs + length ribs trough out the entire surface in order to optimize strength, weight and material usage. A good structural design makes it lighter, stronger and cheaper to manufacture.
Hope you enjoy the design
Looking forward to your feedback, Pablo
more
2015-08-27 20:04:14
#6 Meditation bench by Flaviano Crespi
First issue -
The model has the required dimensions.
The material will be ABS.
Will have to be improved in the coming issues we will load the physical model and stability calculations.
more
2015-08-28 17:27:44
#7 design 1 by ezer153
design
more
2015-09-01 07:56:40
#8 Revolutionary Meditation Bench 1 by Irfan
Revolutionary Meditation Bench
alphacadco.weebly.com
more
2015-09-02 10:58:52
#10 Bench_Go by Ridwan Septyawan
"Bench_Go"
All the best,
Ridwan S
more
2015-09-02 18:24:27
#11 Zench Concept 2 by Pablo Gosso
New and improved approach to product concept.
Mayor features improvements
Lightweight design improved. much closer to client brief request
New design concept for easier smaller transport size, folds to half its size Smaller than any other in the market.
Cushion seat for ischium area for prolonged comfort.
more
2015-09-07 15:07:34
#12 Meditation Bench by Rekha
Foldable plastic bench which can support a weight of 80 kgs.
It has two inward folding flat legs with a stick on each to support the top plate for inclination adjustment.
more
2015-09-08 11:14:35
#13 Meditation Bench by Rekha
2015-09-08 11:38:00
#14 Revolutionary Meditation Bench by REDA
Here is a way that has proven itself a meditation possibility in every religion or so ... I let you meditate ;
;)
more
2015-09-08 14:28:48
#15 Revolutionary Meditation Bench by Vit Gean
The Revolutionary Meditation Bench provides rich functionality (foldable, adjusted angle, locked positions) and simple, intuitively clear usability in a slim, light package. No metal, no screws.
more
2015-09-09 06:51:37
#16 Revolutionary Meditation Table by Love22S
Design is as per Dimensional specifications, completely adjustable as described and fully foldable.
more
2015-09-09 07:45:39
#18 meditation bench concept 1 by priyanshu pandey
HI Sentinel, this is my first meditation bench concept model. it is designed to bear a load upto 100 kg satisfactorily. according to my early calculations it gives 13 mm of max deflection under the influence of a load of 100 kg. the bench weighs around 1.24 kg when made with ABS plastic. this product is still under development. if you like the concept then leave me a private message with your suggestions and modification.
thanks and regards.
more
2015-09-10 06:27:45
#20 Bencho by Ridwan Septyawan
Bencho
more
2015-09-11 19:04:15
#21 Bencho Final by Ridwan Septyawan
"Bencho"
All The Best,
Ridwan S
more
2015-09-13 19:02:29
#22 Meditation bench by vinya
HI! enclosed are files for concept meditation bench, i'll work further if you like it.
Thanks,
vinya
more
2015-09-15 04:04:00
#23 MPENG.CZ-Bench-Design-3A by dhv4brre
Hi Sentinel,
as I wrote in my first comments September 9th, it is very hard to find a solution. Therefore, it took me before I could publish a sensible solution.
So here is my proposal.
As I already wrote once privately: The keys to solving the problems of the three.
1. Use the honeycomb structure, which is used, for example, on the floor of the aircraft and other locally stressed parts.
2. The thickness of the honeycomb skins are optimized and graded
3. Use shaped locks-themselves in principle to ensure the stability of the structure
If you like the concept then leave me a private message with your suggestions and modification.
Thanks for any comments and regards.
Martin
more
2015-09-16 14:12:13
#24 Meditation bench by Flaviano Crespi
This model meets the size indicated by the proposed sketch,
thickness of injection molded parts is 1.5 mm.
The weight of the entire table is 0,60 kg, about 1lb and 5 Oz.
The stability was verified with FEA analysis for a load of 100 kg.
more
2015-09-16 14:22:02
#26 Last Bench by REDA
2015-09-17 16:40:23
#27 MediBench by Jezdo
This bench is mold ready!
I have many year of experience in injection molding industry and product design. so I design this bench to be ready for injection molding, all necessary shapes are drafted and filleted.
all ribs are properly design to handle work load, align to the right direction to provide maximum strength with less weight, no unnecessary ribs are added.
I suggest to make this bench with BMC (BULK MOLDING COMPOUND),
it is thermosetting plastic resins mixed with stranded reinforcement, fillers, and other additives
total volume of this bench is about 54 cubic inch
weight around 3.5 pound when molded with BMC
more
2015-09-17 17:26:35
#28 Zench 3 by Pablo Gosso
Concept created out of prepeg Carbon Fiber manufacturing
more
2015-09-17 17:59:09
#29 meditation bench concept 2 by priyanshu pandey
a simple and easy to adjust meditation bench with ample space for personal customizations.(decals & designing both).
regards.
more
2015-09-17 18:46:46

Discussion

Showing last 20 comments - View All

Flaviano Crespi

Designer

Thu, 24 Sep 2015 06:58:09 +0000
Congratulation to the winner,
i have a curiosity:
how weight the model?

Ridwan Septyawan

Designer

Wed, 23 Sep 2015 18:25:04 +0000
congratulations for Pablo :)

REDA

Designer

Wed, 23 Sep 2015 13:25:30 +0000
Winner ?.

Rekha

Designer

Tue, 15 Sep 2015 11:40:37 +0000
Dear Mr.Sentinel,
You have said that the bench that is to be designed should be a plastic part which is injection moulded. But you also say that it will have a thickness of 0.5 inch.
As per my knowlegde the injection moulding part can have a maximum thickness of 0.15 inch.
this is due to the flowablity of the molten plastic in the cavity. A thickness more than this will lead to filling problems and the design is going fail.

Thank you,

Rekha.

REDA

Designer

Tue, 15 Sep 2015 08:02:37 +0000
Hi Sentinel,
Can you rate please ! ?

Regards
REDA
Thu, 10 Sep 2015 11:37:09 +0000
Well the fact is that none of the posted designs meets all of the requirements (weight, thickness and strength), that I can tell just by the looks. And like you said, it is impossible to do so because of the construction techniques needed (because of plastic molding) and material properties that plastic has.
What I am more surprised of is that many of the designers here made their tables 0.5inch thick and with the right dimension but surely didn't do any FEM analysis to prove that their design really holds 100kg. I mean everyone that knows how to model in any of the CAD softwares can make a desk to meet the requirements, but not anyone can also prove that their design can withstand the required 100kg.
If I'm going to post a deisign I will rather go on the save side and make a model with bigger thickness rather thjen make a model that will be useless.

Regards

sldraftingdesign

Designer

Thu, 10 Sep 2015 02:51:51 +0000
Wow, is crazy rediculous. Awesome work Pablo

dhv4brre

Designer

Wed, 09 Sep 2015 13:00:31 +0000
Hi,

I saw here very nicely handled proposals. However, for all is one of the great BUT:
Checked at least one of you the two key things - mass and strength?

I also spent some time on this project, still without posting anything.
Let's look at it from my party, so rather by the structure and the strength.
For the published geometry and human weight 100 kg.

1. If we are going to be based on the requirement of the maximum allowable weight, then the maximum allowable density of the material must be around 237 kg/m3 (118kg/m3 for 1" plate). The density of ABS plastic is around 1000 kg/m3, so for compliance with weight 1 lb would need only use 24% of the full volume of the individual parts (12% for 1" plate).

2. tensile strength of ABS plastic is about 30MPa. Then for full Board a minimum thickness of plate is 10 mm (based on maximal allowable stress. It is not necessary to do any FEA analysis, on this is sufficient just a pencil and paper. For this thickess of course, the total weight is about 1,5kg. This is 3,3 times more than is required, the maximum weight of 1 lb (0,454kg)

3. On some of the proposals, the authors tried to do some weight reduction by relief. I don't believe that much as they appear to be on to something.

4. And don't forget on deformations. If 1/2" plates will used then deformations can be around 10-20mm.

5. I don't know what you, but I have done few FEA analyses using software NASTRAN for various designs of lighted part "A". I have designed plate with thickness of around 15 mm. If I use this plate also for the parts "B" and "C", then the total weight of assembly is around 600 grams in the case of use the strength of ABS at 100% strength. Some weight could be save after optimization. However, still there are not included local stiffeners which are necessary in places of tilting and folding mechanism.

With regards

Martin

Sentinel

Buyer

Tue, 08 Sep 2015 19:11:57 +0000
Hi,

The thickness of the bench should ideally be 1/2 inch or less, although consideration would be given to designs with thicker plastic, the ones with thinner and lighter designs would be considered superior.

cheers

Rekha

Designer

Tue, 08 Sep 2015 12:12:54 +0000
The strengths of a plastic part are the material type and the ribs that are provided to the part with consideration of direction of the forces acting...
defects increase in plastics as thickness increases.

priyanshu pandey

Designer

Mon, 07 Sep 2015 09:18:53 +0000
correctly said Mr. Luka B. i thought the same while designing the bench. being a mechanical engineer i can that the bench may get buckle easily for a load range of 80-100kg. (although i haven't done any FEA on my design yet) but i have a serious doubt about the thickness . thickness should be about 1 inch (specially for legs) when the product is to be made with plastics. no doubt the product can still be made with 0.5 inch thickness,but i can't guarantee it to be a highly durable product.
Mon, 07 Sep 2015 05:31:01 +0000
Hello sir,

I've spent around 4 hours on this project but I havent posted anything yet. The thickness requirement is very harsh and since you want to make this desk out of plastic I highly doubt that it could carry a lot, like 100kg would be, from a mechanical point of view, nearly impossible. Even some of the designs posted here may look good, but I highly doubt they would be functional, even with as many strengthening ribs as possible.

Would you reconsider a bit bigger thickness, 3/4 or 1inch of the parts?

Regards

Luka

Edwerd

Designer

Wed, 02 Sep 2015 17:39:37 +0000
@Pablo - Its an interesting design ,Good work

Flaviano Crespi

Designer

Mon, 31 Aug 2015 17:10:29 +0000
@sldraftingdesign
I am improving the model, it will upload soon!

sldraftingdesign

Designer

Sun, 30 Aug 2015 23:45:37 +0000
Would love to see how folds

sldraftingdesign

Designer

Thu, 27 Aug 2015 20:10:11 +0000
is fantastic

sldraftingdesign

Designer

Thu, 27 Aug 2015 20:09:32 +0000
is fantastic! Very good job Pablo

sldraftingdesign

Designer

Wed, 26 Aug 2015 20:07:14 +0000
submitted, enjoy!

Sentinel

Buyer

Wed, 26 Aug 2015 04:46:38 +0000
Hi Manuel, thanks for your estimate and the custom part website, I was not aware of it! Although I think we can do better than $100,000 in total cost for the first 10,000 through some contacts in China that specialize in high end snowboard bindings, this would not be an unfeasible cost. What parameters did you enter in the estimator to arrive at your numbers?

Wooden benches available online start at 5 lbs weight.

Hi Pat! I do not have a particular plastic in mind, and am open to suggestions regarding wall thickness as well. We were also suggested that a foam-filled product might be the way to go in order to get more strength.

Our main objectives (besides the desired functionality and strength) are light weight and small size. Of course the product needs to look good as well.

Thanks for your questions
Wed, 26 Aug 2015 03:39:21 +0000
Do you have a particular plastic in mind?
This will drive wall thickness on the plastic and correspondingly the design
http://www.protolabs.com/injection-molding/fundamentals-of-molding/wall-thickness-recommended

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