Hook Design for SNUZR: The World's First Toilet Stall HammockBlind

in Mechanical Engineering held by Dan Bolduc
Contest Ended, Winner(s) have been selected.
Looking for an engineer who can design a wall grappling hook that can suspend a hanging chair hammock between two partition walls in a toilet stall. The chair hammock has 4 straps which are attached to 4 identical wall hooks affixed at the top of the toilet stall partition. The hook must be able to hold securely in place as load weight is gradually applied. The typical user will install the hammock as follows: attach hooks on the side partition walls of the toilet stall - towards the front and back of stall and on both sides, attach hammock straps onto the hook, sits down on the hammock and if necessary get back up to adjust straps to ideal chair height and position. Previous designs of the hook did not stay in place and slid towards the centre of the wall due to side torque as weight was applied via the straps at roughly 45 degree angles (which also damaged or marked up the walls). We need a rockstar engineer who can solve this design challenge with a sense of humour.
a) Hook design must be the same for all 4 attachment points i.e. no left or right, back or front specific hooks

b) Hooks can withstand 100kg static load with side torque

c) Hooks must remain firmly in place with side torque as weight is applied at 45 degree angle

d) Hook must allow for partition wall width variance of between 10 - 15mm as toilet stall designs / materials vary

e) Hook must not scratch the wall i.e. use of rubber or similar material

f) Hook mechanism must be easy / quick to install and snap into place (like a vice grip) to give assurance that hook is secure and will not move as weight is applied

g) Design must be as light and compact as possible to ensure portability and reduce shipping costs

h) Design must be as unobtrusive as possible so that hook is not too noticeable in adjacent toilet stall or outside of stall

i) Design is relatively cheap to manufacture with low volume; note that we tried 3D printing with previous designs but needed special resin due to weight (regular plastics broke under stress)
Don't Wants:
Simplicity is best - no complicated designs

Try and leverage existing product designs (per attached photos)


1st Winner
#54 hammock hook concept by RBLdesign
Hi. More simple than that it is not possible. I can bet. :)
Jul 20, 2018 22:24
#46 HOOK 3d by Alzazari_tech
I made the design as simple as possible
Part made of metal can be made by machining and casting process
Rubber parts can be made with injection molding or 3d printers
Please rate or comment, any feedback is appreciated
Best regards
Rashid Ridha
Jul 17, 2018 10:47
#32 suction cup by Mech_Eng
any feedback will be appreciated
Jun 22, 2018 2:12
#33 simple support by Mech_Eng
Jun 22, 2018 2:15
#34 Simple Hook Design by Harjeet Sharma
I have created this at the time of contest but not able to submit it.
Please rate this and also give me feedback, if you require some changes then you are welcome.
It can bear up to 100kg to 120kg after installation.
Thanks & Regards
Harjeet Sharma
Jul 13, 2018 10:03
#35 Hook v4 by Milan Borovic
2 versions explained in the attached image.
Let me know your thoughts on this.
I assume that you want to continue using telescopic bar?
Jul 13, 2018 16:25
#37 Exclusive S.N.U.Z.R Hooks by Eira
NEW VERSION CONCEPT 1 after contest re-open.
I hope you like it & looking forward for you feedback.
Thank you.
Jul 15, 2018 5:10
#38 Hook Design by NabilZer
this is my first submission for this contest
hope you like this design
Best regards
Jul 15, 2018 14:51
#42 hammock hook by Shakir Istiak
modeling by solidworks 16
rendering in keyshot 6
Jul 16, 2018 12:39
#43 hammock hook by Shakir Istiak
hope you like this design ...this is looking beautiful...
best regards
Jul 16, 2018 12:46
#44 Hook Design by NabilZer
this is my second design
hope tou like it
Jul 16, 2018 20:42
#45 Hook v6 by Milan Borovic
This is the simplest model based on your suggestions.
Jul 16, 2018 21:28
#49 For Project: Hook Design for SNUZR: by Percie_Gala
i hope this is what are you looking, for your references i attach a catalog for you to review about the design.
The concept design are Numatic Vacuum Gripping or a Poster Vacuum to attach/detach both side of the wall of the toilet stall for anti-slip and avoid the side torque.
Your Rate are more highly appreciated.
Thank you. Good Luck!
Jul 18, 2018 7:49
#51 Hook v7 by Milan Borovic
Hi Dan,
Please find attached another idea for your project.
There are 4 variations of the same principle.
Jul 19, 2018 10:49
#52 Lever clamp v2.5 by Serge Krjukov
Add hook for closed strap
Jul 19, 2018 12:04
#53 Hook Design for The World's First Toilet Stall Hammock by Harjeet Sharma
This is the simple mechanism which will definitely work, as per the requirements.
Hope you understand it.
Thanks & Regards
Harjeet Sharma
Jul 20, 2018 15:29
#55 Stupid Hook for Hammock by Andika Jamaluddin
This Design just Trial Model, I want to improve if you interesting the basic model.
I think the design as you needed.
Thanks & Regards.
Andika J.
Jul 21, 2018 1:23
#56 SNUZR Telescoping S-Hook by Anne Pauley
This SNUZR telescoping S-hook design allows the hooks to fit on any wall width, and the telescoping connector in the middle keeps the hooks from sliding together when weight is applied. The S-hook is lined with rubber to protect the stall wall. Finally, the simple design is straightforward and unobtrusive.
This hook can me made from either metal or a strong plastic. The telescoping rod can be easily sourced as a curtain or shower rod.
Jul 21, 2018 3:07
#57 SNUZR Bracket (revised) by Anne Pauley
This bracket is designed to be simple, inexpensive, and effective. Chair straps are attached in the middle of the bracket, and the bracket is hooked over the wall. The rubber contact points in the front and back allow the bracket to account for side torque without slipping.
The bracket can also be biased inward so that it can clamp onto the wall for additional hold. The rubber pads on the inside could be connected for additional non-slip contact area.
The bracket is made simply and inexpensively from formed sheet metal (waterjet cut or machined), and rubber.
Jul 21, 2018 3:31
#58 Funny Hook by Eira
Jul 21, 2018 3:34
#59 SNUZR S-Hook Sheet Metal by Anne Pauley
This S-hook is designed to be made from two pieces of sheet metal with simple M5 standoffs and bolts to secure them together. The inside of the hook can also be lined with rubber for a non-slip grip. This design could also be used with a central telescoping rod. This sheet metal and simple hardware design will also ship in a very small volume, as they can be assembled by the user with only a phillips screwdriver.
Jul 21, 2018 4:00
#16 screw lock by MS22 Design
How ever in normal locking system we need to screw it for wall adjustment so made the screw as a main locking purpose.
Jun 5, 2018 11:26
#2 concept1 by DesignAssist
Simple cantilever lock.
Laser cut aluminium 8mm thick and 2 custom moulded rubber pads.
May 23, 2018 12:02
#3 Hook v1 by Milan Borovic
Please rate or comment, any feedback is appreciated.
May 23, 2018 17:23
#4 Hook v2 by Milan Borovic
Stable and strong.
May 23, 2018 19:26
#5 Point of view by GodInventor
“You never change things by fighting the existing reality. To change something, build a new model that makes the existing model obsolete.” R. Buckminster Fuller
May 24, 2018 5:40
#6 Concept1_improved by DesignAssist
May 24, 2018 7:55
#7 Concept 2 by DesignAssist
Cam lock design
May 24, 2018 7:55
#8 Hammock Hook Concept01 by Coman
This is only a concept presentation and does not include detail.
We can complete the product design should we continue and also offer to manufacture the product for you.
Should we manufacture the product we can also do adhoc changes to the design when required.
The design will be simple, efficient and effective.
Kind Regards
May 24, 2018 15:33
#9 hook_design_c2.stp by Karthikeyan Arumugam
Please find the attached Hook design concept 2 files for your reviews
Thanks and Best Regards
Karthikeyan Arumugam
May 28, 2018 8:21
#10 hook_design_c3.stp by Karthikeyan Arumugam
Please find the attached Hook design concept 3 files for your reviews
Thanks and Best Regards
Karthikeyan Arumugam
Jun 2, 2018 15:50
#11 Hook v3 by Milan Borovic
Rate or comment is welcome
Jun 3, 2018 18:40
#12 v4 hook by Milan Borovic
Rate or comment is appreciated
Jun 3, 2018 20:44
#13 Hook Design for SNUZR: The World's First Toilet Stall Hammock by sherifelsheikh
Jun 3, 2018 22:25
#14 For Project: Hook Design for SNUZR: The World's First Toilet Stall Hammock by Percie_Gala
Kindly Rate this. Thank you.
Jun 4, 2018 15:06
#15 For Project: Hook Design for SNUZR: The World's First Toilet Stall Hammock by Percie_Gala
Kindly Rate this. Thank you.
Jun 4, 2018 17:40
#1 hook_design_c1.stp by Karthikeyan Arumugam
Please find the attached Hook design concept 1 files for your reviews
Thanks and Best Regards
Karthikeyan Arumugam
May 23, 2018 10:25
#17 Pressure Hanger Concept by Kbrown821
Here is my concept for the bathroom stall hanger. Refer to Description.txt file for more information. If you like this concept please provide feedback and I can rework the design for your needs.
Jun 5, 2018 13:30
#18 hook_design_c4.stp by Karthikeyan Arumugam
Please find the attached Hook design concept 4 files for your review.
Thanks and Best Regards
Karthikeyan Arumugam
Jun 6, 2018 9:56
#20 hook_design_c5.stp by Karthikeyan Arumugam
Please find the attached Hook design concept 5 files for your review.
Thanks and Best Regards
Karthikeyan Arumugam
Jun 8, 2018 10:02
#21 SNUZR HOOK by ARJ0019
This hook is made out of two peices of bent 1/8 inch steel rod. The peices are then welded together and coated in rubber. The rubber coating prevents the hook from scratching what it is attached to.
Jun 14, 2018 0:26




Fri, 13 Jul 2018 12:48:55 +0000
Intresting contest.i'll submit ly desigb asap

Dan Bolduc


Fri, 13 Jul 2018 08:05:06 +0000
Hello Designers,

Thank you to everyone who submitted a design. Whilst some of the designs were interesting and have potential, none are suitable for my requirements. Therefore we've re-opened the contest for one more week and will be increasing the prize money by $200. I will also private message the designers who came up with the most interesting designs to provide more explicit feedback of what improvements could be made to their designs.

Fri, 08 Jun 2018 20:26:18 +0000
Would a sheet metal design be acceptable? Also, is 'snap into place' in requirement (f) a hard requirement if the design leverages the user's weight in securing it?



Thu, 24 May 2018 05:11:41 +0000
Hello, do you have any pictures of parts of the wall where the hook will be attached. Thank you.



Wed, 23 May 2018 20:27:13 +0000
I think the toilet stall you are talking about are based on standard of 18mm thick wall with Marine-Ply core faced with high pressure laminate in wet areas. Silver anodized aluminum edge trim to perimeter of all panels. Extruded aluminum alloy 6060 with exposed face anodic coated.
And not advisable to carry a 100kg load, but I recommend a rectangular adjustable horizontal bracing support connected to 4 hooks to be able the balance of a static or a dynamic load.

Milan Borovic


Wed, 23 May 2018 12:55:13 +0000
Hi, do you have a picture of your hammock attached on the walls of toilet stall.
I need to see your product and how is attached to the wall so I can think of the solution.

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