Coiled springs beat traditional hinges
A
Spirol Industries product story
Edited by the Engineeringtalk editorial team
Mar 29, 2007
Spirol Industries is providing coil pins which are demonstrating high levels of user resilience.
The use of Spirol coiled springs in hinged cosmetic powder compacts is demonstrating major advantages over traditional hinges in terms of cost and durability.
In an industry where product quality is vital but margins small, the need to eliminate product failures is taking on more and more significance with cosmetic compact manufacturers.
Spirol Industries is providing a solution with coil pins which are demonstrating high levels of user resilience.
Previously the practice was to design misalignment into the holes to create a friction hinge.
This was so that the lid of the compact could be held open for display purposes and also to create a smooth hinge action.
However, the use of Spirol series 550 coiled springs pin simplifies the design as misalignment of the inner and outer case to provide friction is no longer necessary.
By eliminating this requirement not only is the design and production process simplified, but also the risk of cracking, caused by induced stresses, is removed.
This significantly reduces scrap during manufacturing and failure during use.
Series 550 coiled spring pins exert uniform radial spring forces which distribute stress uniformly.
This results in a controlled hinge movement over a long period of time and this movement is achieved with wider tolerances and lower moulding costs than with the alternative approach of using a solid pin or cut wire.
Series 550 coiled spring pins are typically manufactured in work-hardened nickel stainless steel AISI 302/304.
The pins used in the application are normally either 1.2 or 1.5mm in diameter and when coupled with the automatic HC pin insertion machine, productivity is increased as a result of reduced assembly times.
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