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News

Delrin and Zytel for Simpler, Safer Switch

Du Pont Engineering Polymers : 25 February, 2002  (New Product)
Arcolectric Switches, of West Molesey, Surrey, UK, chose DuPont Delrin acetal resin for the main working parts of its completely redesigned rotary switch for foot spas. The material's very good resilience, low creep, and excellent abrasion-resistance over 10 000 switching cycles were the decisive factors in its choice. Arcolectric worked with DuPont to design an improved and greatly simplified switch in which the total number of parts was significantly reduced. The redesigned switches can be sold at a lower price than the earlier model, due to reduced production and assembly costs.
Arcolectric Switches, of West Molesey, Surrey, UK, chose DuPont Delrin acetal resin for the main working parts of its completely redesigned rotary switch for foot spas. The material's very good resilience, low creep, and excellent abrasion-resistance over 10 000 switching cycles were the decisive factors in its choice.

Arcolectric worked with DuPont to design an improved and greatly simplified switch in which the total number of parts was significantly reduced. The redesigned switches can be sold at a lower price than the earlier model, due to reduced production and assembly costs.

The switch housing, which incorporates a snap-fit opening mechanism, is made of Zytel nylon, which offers good processability, dimensional stability and good electrical insulation characteristics.

The main working part is a frame of Delrin incorporating two parallel ribs: a square-section shaft fits between the ribs. When the shaft has turned through 45, it forces the ribs apart. When it has turned through 90, they spring together again, into their original position.

This simple operating principle replaces a complicated system of springs and plungers found in conventional rotary switches of this kind. No lubrication is needed and the switch can be used effortlessly over an extended period.
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