DS-SEP23-PG33_Layout 1 14/09/2023 14:18 Page 1
FASTENINGS & ADHESIVES
Designing a push screw solution for monitor mounting brackets In the changing world of home working, hot
desking and the need for two screen displays,
we are seeing changes in how devices are being positioned in the workspace. So when a global monitor manufacturer needed a small but
strong fixing solution that would enable easier assembly, it turned to TR Fastenings
T
he customer – a globally recognised computer and enclosure manufacturer, and customer of TR Fastenings for 20
years – required a bespoke solution to launch a new product, while also enhancing its range of mini-PC screen stands. It couldn’t find a solution to attach a stand that would be reusable, so first approached TR to help it create more effective fasteners for its mounting brackets. It also needed to be capable of screwing and unscrewing repeatedly without wearing or loosening, and be strong enough to take the load and support of the monitor weight. After consultation with TR, it became clear that
it needed a product that would go beyond what was currently available in the market.
the solution
The customer had initially set about identifying a plastic rivet solution, but it became apparent that a specifically designed component was required. TR’s design and engineering teams supported the request and were able to develop a unique proposition – an innovative and effective push screw rivet. Together they identified
the need to have an insertion force of 35N to prevent RSI, an extraction force of a minimum of 90N in order to remain secure, and for it to be unscrewed repeatedly with a screwdriver without wearing down over time. No small challenge for a small fastener! Kevin Rogers, global
director of Plastics and Rubber Commodity, TR Fastenings said: “As part of the testing process, a formal audit partner was brought in, application tests including push in force, pull out force,
Production parts on sprue for testing
individual cavity inspection, fail tests, shear strength testing, and others, were all carried out. I invited the customer’s senior engineer who happened to be based only 30 mins away from our vendor’s factory in China. The plan was to show him the design process and summary to date, all of which was prepared in advance by our vendor for the day in question. We worked on their production line to see the final design running live and took samples from the line for inspection. Whilst this was being done, a team of engineers was busily conducting a full PPAP, which was presented in the afternoon. Upon asking the customer’s engineer for his decision he commented: ‘How can I possibly reject a presentation and product like this, I have never seen such an efficient, well prepared and executed product audit in all my years as an engineer’. At which point the green light was given. “As a final deliberate
destruction test – as this product is unwrapped and assembled by the public for home use – he asked three of us to physically hold down the stand, at which point he put his foot against the desk and physically tore the PC bracket from the stand. Amazingly the metal stand snapped, but the four special plastic push screws remained firmly
Wall mount passing pull out force test
in place! At which point he simply smiled!”
project challenges
The design and manufacturing of a unique product was needed for this project, so this was both an exciting but challenging opportunity for the TR team. From the start it required a lot of additional testing and resources that all partners needed to be involved with and had to collaborate closely together on. In the early design phase, it
Mounting bracket underside
was a concern that the pull-out force required to remove the screw from above the unit would be too weak, so this needed addressing. The question was raised as to
how additional tooling could be used to resize the existing part and modify it. In a short time, and through collaboration, this was improved and a sweet spot in the tightness of the shank was achieved, providing acceptable installation force, and enhanced pull out force. Under normal usage testing, the rivet was
pushed into the fixture TR had provided and removed using a standard screwdriver. This was repeated eight times then the insertion force of the 9th time pressing fixture and the pulling force when forced out. In wall mount passing test under the weight of 15.0KGF tested for 24 hours the screws remained tight in place.
project conclusion
TR Fastenings has developed a solution that is unlike anything currently on the market, and has the capability to be a game changer for the home computing market. It joins an entire range of M3-M8 sizes in three different head styles to suit a variety of applications. The team at TR created a product that has
the capability to change the way fasteners are used with PC screen brackets, delivering increased product life and enhanced quality.
TR Fastenings
www.trfastenings.com
SEPTEMBER 2023 DESIGN SOLUTIONS 33 Completed
PC mounting bracket
FEATURE
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