Apparatus for protecting thermocouple circuits in...

Details Apparatus for protecting thermocouple circuits in... Apparatus for protecting thermocouple circuits in...

2005-07-05

2005-07-05

Heitbrink, Tim (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Temperature control

C361S103000, C361S104000, C264S040600, C264S328140, C264S328160, C425S548000

Reexamination Certificate

active

06913453

ABSTRACT:
An apparatus for protecting thermocouple circuits in an injection molding system includes a protection circuit for each thermocouple pair. The protection circuit includes a resettable fuse disposed in series with each thermocouple wire for preventing high leakage current from passing through, and a capacitor connected to the two wires of a thermocouple to filter out AC line noise. The protection circuits are integrated in a junction box used to connect a heater power cable and a thermocouple control cable to the hot-half of the molding machine.

REFERENCES:
patent: 4814969 (1989-03-01), Kiyooka
patent: 5320513 (1994-06-01), Schmidt
patent: 5795511 (1998-08-01), Kalantzis et al.
patent: 5984716 (1999-11-01), Starkey
patent: 6000831 (1999-12-01), Triplett
patent: 6157529 (2000-12-01), Ahuja
patent: 6477025 (2002-11-01), Goldbach et al.
Tip 'N Ring™, Vishay Vitramon, “Multilayer Ceramic Chip Capacitors” Document No. 45015, Revision Oct. 5, 2000, pp. 45-47.
Radial-leaded, “PolySwitch Radial-leaded Resettable Devices”, Raychem Circuit Protection, pp. 205-236.

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