Electric heating – Heating devices – With heating unit structure
Reexamination Certificate
2000-01-10
2001-05-08
Jeffery, John A. (Department: 3742)
Electric heating
Heating devices
With heating unit structure
C219S535000, C156S304200, C156S273500
Reexamination Certificate
active
06229122
ABSTRACT:
TECHNICAL FIELD
The invention relates to a method for establishing by means of heat treatment a weld or glue connection between two mutually adjacent surfaces of components, for instance tubes, using respectively adhesive material, for instance plastic, more particularly epoxy resin, wherein heat is supplied around or close to the weld surfaces for connecting.
BACKGROUND INFORMATION
The above stated method is frequently used for welding or glueing together plastic articles, for instance a tube end in a sleeve, in order to realize an air- or liquid-tight connection as well as a connection with tensile and pressure strength. In such a weld obtained by means of heat it is very important to have the temperature at the right level in order to soften, melt or cure the plastic materials, and also to have the time duration to ensure that the heat supply has been long enough to establish an intimate connection.
SUMMARY OF THE INVENTION
For this purpose the invention provides a method which is distinguished in that in order to measure the correct quantity of supplied heat and prior to the heat supply a test loop is arranged around the weld provided with a temperature-sensitive interrupter and an electric fuse connected in parallel thereto, and after the interrupter has responded as a result of the correct temperature being reached after a pre-determined time a current surge is passed through the safety fuse in the loop.
Owing to the exceptional test loop according to the invention, it is now possible to monitor in very simple manner during welding as well as thereafter whether the weld has been sufficient to ensure the desired sealing and tensile strength.
Heating of the two plastic objects can take place in random manner, for instance by supplying heat externally by means of a heat blanket and the like, but it is also possible to embed a resistance wire close to the surfaces of the articles for adhering, which wire heats under electric voltage.
The invention further relates to a device for performing the above stated method, which is characterized by a loop-like conducting element which is provided with two members connected in parallel in the form of a temperature-sensitive interrupter on the one hand and a melt wire on the other.
The loop used in the device can also be used to monitor the correct weld after the process has taken place.
If the loop is still fully closed it can be established by generating an external signal by means of a transmitter whether the loop is closed and, if this is the case, one of the parameters has then been insufficient, i.e. the temperature or the time.
The invention will be further elucidated in the figure description of an embodiment hereinbelow.
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patent: 4978837 (1990-12-01), Eggleston
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patent: 5141580 (1992-08-01), Dufour et al.
patent: 0093821 (1983-11-01), None
patent: 0129505 (1984-12-01), None
patent: 1-301231 (1989-12-01), None
Astraco Beheer B.V
Jeffery John A.
Pauly Joan H.
LandOfFree
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