01 October 2009
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Coiled spring pins suit moulded nozzle application

A manufacturer of moulded plastic spray bottle nozzles for use in restaurants was looking for a way to make the adjustable spray tip tamper proof and prevent users applying too much or little solution.

Spirol Industries came up with a solution involving pinning the nozzle in position.

The original problem was that the adjustment position of the spray tip varied from application to application. To achieve their aim of ensuring that the right amount of solution would be applied, the manufacturer did not want to alter the moulded parts or perform any secondary machining operations, such as drilling or punching holes.

The pin inserter had to be extremely quick, and easy to use. Spirol determined that the hole could be created by using the pin to pierce the plastic during installation. The swaged chamfers on the company's coiled pin make an ideal reduced diameter for piercing the hole, while the larger body diameter of the pin enables it to retain itself securely in the assembly.

The nozzle caps arrive to the Spirol's Model PR Pin Inserter pre-adjusted for the proper piercing location. The operator loads the components into the fixture and activates the machine. The pin is installed, the machine retracts and resets. No machine adjustments are required during installation.

Due to the rotational resistance provided by the pin, the end user cannot adjust the spray volume in the final assembly – making it tamper proof.

Author
Paul Gay

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