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APPLICATION TECHNOLOGY Hall: 4 Stand: B103


Leaner solution for back rest


Spirol Industries has provided a new design solution for a furniture manufacturer which was using a free fit machined pin, retained with an e-clip as the hinge pin, for the pivoting back rests on office chairs.


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oth the machined pin and the e-clip were installed manually but the installation of the retaining e-clip was time consuming and problematic. This was because once the machined pin was installed in the chair, it left very little space for the assembler to install the e-clip and ensure that it was seated properly. Failure of a properly secured e-clip on the machined pin resulted in failure as the main pivot pin would work its way out of the chair. Spirol worked with the customer and suggested the replacement of the two piece hinge pin with a single self-retaining


Spirol HP400 Series Solid pin. The HP 400 Series Solid pin is specifically designed for use in plastic applications and is ideal for plastic hinges with a free-fit requirement. Spirol explains that the unique fetter barb design retains the pin in the outer hinge ear and eliminates the possibility of the pin working loose. The Spirol recommendation eliminated the need for an expensive machined pin that required the costly retention groove


for the e-clip. Additionally, since the HP400 Series Solid pin is self-retaining, it is installed in a single operation and does not require a secondary clip. “Spirol’s solution required minimal changes to the current chair design. It has improved the chair’s quality as well as


reducing the cost of the components by 25%. Additional savings were achieved through the reduction in assembly labour and the payback period on the design changes was just five months.”


Securing off-highway hydraulic systems


The developmental trend for industrial and off-road machinery, whether mobile or otherwise, is increasingly to employ a sophisticated hydraulic system as a means of exerting power over its chosen work environment. Over many years Elesa has developed apparently simple but deceptively thoughtful technical solutions to ensure security of these safety and performance critical systems.


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ydraulic based equipment from dump trucks and road laying machines to tractors, telehandlers and forestry or military vehicles, all operate in extreme conditions where they are also vulnerable to outside interference and are


prone to damage from both daily operation and vandalism. Elesa development has therefore focused on security oriented accessories aimed at prevention of leakage/damage to the hydraulic system – preserving the integrity of the system and ensuring it has sufficient clean fluid at all times. These are safety and performance critical components that also


seek to minimise downtime by reducing the likelihood of damage and simplifying/reducing maintenance. Such components come in four main areas: • Vandal proof caps – keep dirt out. • Pressure relieving caps – keep fluid in. • Magnetic plugs – keep fluid clean of metallic particles. • Fluid level monitoring and alarms – advise adequate fluid levels.


Development technicians at Elesa corporate laboratories work with all relevant EU legislation, which covers European Standards


(EN), International Standards (ISO), Health and Safety requirements and the Machinery Directive regarding CE marking. In order to do this to the highest level they use a process of Virtual Product Development originating in Computer Aided Design (CAD) and moving on to Computer Integrated Manufacture (CIM). Elesa’s accessory solution for off-road hydraulic applications forms just one section of its standard range of industrial elements,


where the company has a history of partnering with OEMs. The range includes knobs, handles and hand-wheels - essential for operation and control functions of all types of hydraulic and manual equipment.


148 Fastener + Fixing Magazine • Issue 67 January 2011


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