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Nurse Station Call with Emergency Pull
Spray and Wash Down Water Tight

This was a joint venture between CDI and NETbased on behalf of their customer.  Hospital wiring to central alarm and nurses stations are complex installations.  Preexisting call stations consisted of a 2-gang box for interactive voice and nurse to station emergency notifications.  A second single-gang box contained an emergency pull switch with lanyard to alert the nurses station, trigger emergency lights, etc.  The objective was to combine these two units into one within a single 2-gang unit, less then 2/3s the current wall space.

This emergency call contained all the necessary electronics, speaker, microphone and emergency pull switch.  The face of the unit had to be wash/spray down water tight to protect the circuitry and wall wiring.  The typical toggle switch was replaced with a hall-effect switch with a magnet insert molded into the pull lever.  The speaker used a water tight cone and perimeter gasket.  An elastomeric keypad provided a water-tight seal around the various buttons.  Ultrasonically welded light pipes gave indicated operating states.  A wall gasket attached to the front panel accommodated various wall surface textures – providing the final seal.

Processes used in the enclosure:

  • Injection molded plastics (front panel and light pipes)
  • Insert molded injection molded plastics (Magnet insert molded into the pull switch to trip the hall-effect sensor on the main board)
  • TPE (Thermal Plastic Elastomer) injection molded (Perimeter wall gasket)
  • Silicone compression molding (Elastomeric keypad)
December 8, 2016 admin

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