Soft close, no pinch safety hingeBlind

in Industrial Design Services held by AO123
Contest Ended, The buyer is selecting the winner(s).
We are a company that provides innovative product solutions for the physical education and educational market. We pride ourselves in providing the most innovative, high quality product to our customer. This product would be a soft close, safety hinge used to hold the lid open on our line of ball carts. It needs to be pressure sensitive and stay open at any angle and not slam closed. It also must not have any pinch points where the fingers could get pinched. The lid would need to be pushed closed by the user. The lid itself that needs to be supported is about 25lbs., however, the hinge would need to support more in order to keep it from closing on it's own. The end user can be a student so safety is critical. There are many soft close hinges on the market, many with pneumatic functionality and gas hinges and often used on toy boxes. I have attached a photo of an existing hinge on the market just for reference. I am open to materials based on design and likely will need to be pneumatic or incorporate a gas hinge. I have included a link to our website to see the carts it would be used on. You can also see a few of the existing hinges that have been/are being used that I am looking to update with a better hinge. I am also including files to the carts themselves so you can see the product the hinge will be used on, as well as instructions that show the current hinge being used that I am looking to update. The existing hinge is not ideal as there are potential pinch points.
Functionality of the mechanics will be the key factor in the success of the design. It needs to hold the weight of the lid at any angle and needs to be safe. The hinge must function, fit and work properly with our existing cart designs.
Don't Wants:
A design that is not going to function as intended and not able to hold the weight of the lid. In addition, I don't want a design that is too difficult or expensive to manufacture.
  1. SolidWorks
Additional Information
additional specifications:

Open Force: 4-7lbs
-Extended Length: < 20"
-Collapsed Length: < 16"
-Cylinder Diameter: < 1"
-Mounting: Ball Stud Joints


#28 All type attachment hinge. by Kzswara
All type attachment give in down and this degine. This is simple useful not complicated degine hinge so open and close smoothly and no pinch and very safe
Dec 3, 2021 10:35
#27 Best degine hinge by Kzswara
This is best degine Hinge. Soft close no pinch and 25lbs easy to carry. And ball bearing to move all site easy to fix and no complicated. Assembly are movable please check. thank you.
Dec 2, 2021 11:09
#26 Best hinge by Kzswara
Hidden design
Nov 26, 2021 14:45
#24 Best Hinge by Kzswara
Nov 26, 2021 6:37
#23 Titan Assembly with spring by scottb3
I tried to keep it very simple and consideraly less money than some of lid closures on the market. You just need to widen the same hinges that your using now. The springs will increas tension as the lide closes. At full open the spring wil release all tension on the door at 90 deg. open. There might be a need to add a stop at 90 deg. open, if you want the door to stop there. The door won't close on its own due to the springs. I worked through a lot of ideas, but this was just too simple and covers your request. There might to some tweaking on the spring to get the exact loading. The springs on the cart are 0.07 dia. with 6 coils. Both springs will suppor 10 lbs. at fully closed.
Nov 23, 2021 19:47
#22 Soft Pinch by meet855
Please find my ideas of the soft pinch for the Hing. I think this idea can solve the pinch problem for mechanism.
Thanks & Regards
Nov 23, 2021 19:19
#21 Soft close, no pinch safety hinge by sherifelsheikh
For Checking
Nov 23, 2021 10:52
#20 Hinge folding by Vivek0006
Hidden design
It's a good project. I create a concept as per your requirement like stay at any angle, easy to handle.
Hope you like. it.
Nov 22, 2021 22:08
#17 Safety Hinge by Salim Benyoucef
This is very simple design of hinge using ratchet mechanism to lock at any position. To be more safe I added damper that could help maintain the position at any angle and to close safely.
Looking forward from you.
I could provide you by more details and parts.
Best regards
Nov 22, 2021 11:45
#15 Gasless joint by Damian Martinez
-This design is a very simple pinch free joint which does not use a gas or hydraulic strut. This joint requires no modification to the position of the current joint mounting holes on the cart and requires no additional holes to mount. It would use the same mounting hardware as the original joint.
-The joint consists of a grooved rod with a curved end, a tension box, and a 1/4"-28, 3/8" long tensioning thumb screw.
-The stiffness of the joint is adjustable through the thumb screw which creates friction in the joint when tightened.
-There are several methods by which the joint box can be manufactured. One of these methods is by a sheet metal cutout which can be folded and welded at the seams. The file for the sheet metal cutout has been included.
In order to accommodate the tensioning screw, the joint box itself can be threaded or a 1/4"-28 bolt welded directly onto the sheet metal
Nov 22, 2021 7:17
#14 Titan Ball Cart - Soft close, no pinch safety hinge. #03 by moon47usaco
As before please see the "Response 03.pdf" in the provided zip file for a detailed description of this design revision. This will be the final revision to the hinge design. This should address aesthetics, ease of manufacturing and ease of use as best as possible. Thank you.
Nov 22, 2021 5:32
#13 Friction Hinge by omkark
In this design pneumatic application is not used rather a more compact, durable and effective design is proposed. Hope this satisfies your requirements.
Nov 21, 2021 7:52
#12 Design #01 by ahmadnazree
Hi Contest Holder,
Please find the attached design for your review. The same concept can be applied to the single compartment Titan Ball Cart. Thank you very much.
Best Regards,
Ahmad Nazree
Nov 20, 2021 16:29
#11 Soft Close Hinge Design by teddg
Please see included design for soft close, no pinch safety hinge. Note: only one style of friction element is provided. Certainly others could be considered (i.e. spring steel, rubber grommets inside telescoping mechanism) but the overall concept would be the same. The radial arc of the telescoping parts could be moved closer to the pivot if friction method would allow. This would reduce material needed but might limit overall movement of lid as packaging everything would get tighter.
Best regards,
Nov 19, 2021 1:32
Hidden design
Download Files
Nov 18, 2021 1:30
#8 Soft close, no pinch safety hinge by REDA
Nov 17, 2021 21:52
#7 Soft close, no pinch safety hinge by REDA
Nov 16, 2021 20:53
#6 Titan Ball Cart - Soft close, no pinch safety hinge. #02 by moon47usaco
Please see the "Response 02.pdf" in the provided zip file for this second revision to the hinge design. I think this looks much cleaner than the 1st submission. Thank you.
Nov 16, 2021 17:05
#5 Titan Ball Cart - Soft close, no pinch safety hinge. by moon47usaco
Hidden design
Please see the "Rersponse.pdf" in the uploaded zip file. It includes a detailed description of the design and all the supplied materials. This was an interesting project to work on. I hope you enjoy the submission. Thank you.
Nov 15, 2021 14:19
Hidden design
Nov 14, 2021 15:31
Nov 14, 2021 14:16
#2 1st Design Soft Close No Pich Safety Hinge by Chaniago
Dear Ao and Teams
Here is my first design for the "Soft close, no pinch safety hinge" project. In your existing mechanism, you use the hinge type Stays With Catch Mechanism. With this mechanism, it is very likely that your fingers can be pinched when closing the top cover.
And for this design change, I tried to replace it with a "Gas Springs" mechanism which is certainly more safety when compared to the previous mechanism, although there is a slightly higher cost that must be spent. The gas spring mechanism is often used in kitchen equipment and automotive manufacturers.
For more details, please see the attached zip folder especially for specifications and 3d CAD models.
Hopefully this design can be useful and can helping you, in the future maybe we can discuss further regarding the development of this design. Because I have also prepared a design concept which is also cheaper in cost .
And I'm always open to suggestions and feedback from you.
It's a pleasure to work with you and your teams.
Healthy Greetings
Nov 14, 2021 7:49
#1 Soft close, no pinch safety hinge by REDA
Thanks ;)
Nov 11, 2021 22:00




Mon, 15 Nov 2021 09:06:42 +0000
Dear Ao And Teams

Can you give a feedback regarding my design which I submitted a few days ago.

Wed, 10 Nov 2021 18:55:43 +0000
Is there a way I can contact you to discuss some find details? I have several questions that need answered.



Tue, 09 Nov 2021 21:05:17 +0000
Hi James, The weight is approx 25lbs (I mentioned this in the description) and I did add some additional specs. I apologize but I am not sure on the torque. thanks!
Tue, 09 Nov 2021 20:58:39 +0000
Do you know the weight of the top panel, or better, the torque needed to lift the lid on the current hinge pins?



Tue, 09 Nov 2021 19:54:07 +0000
Hi Zech, I would be looking for the complete assembly that would work on our carts. I just attached an image as a reference of the type of functionality I would be looking for. thanks!
Tue, 09 Nov 2021 19:51:08 +0000

Are you looking for an entire "hinge" assembly with an integrated strut/ lift mechanism? Or simply a safety lift mechanism, for example the strut image that you attached. The strut image attached is not the actual "hinge" point.





Tue, 09 Nov 2021 14:55:48 +0000
Hi Parvinder,
1. We use Solidworks so it either needs to be in Solidworks or something that is compatible and could be easily converted.
2. That is difficult to say without knowing the type of hinge. $5-$10 per piece
3. I am open to materials based on design but imagine it would be a combination including metal and plastic.
I also added some specifications for a a gas hinge to the project that would be helpful.

Tue, 09 Nov 2021 01:23:39 +0000
Hello Team
Few questions I have to ask before working on it.
1. Can I use NX software to design this product.
2. What is your estimated cost of per piece during manufacturing.
3. Which material do you prefer for this product.

Parvinder Singh

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