US 5,349,165 A · Induction heater system for fusing plastics

Abstract

A heater system provides a portable lightweight tool including the core and at least the primary winding of a transformer having a secondary that may be permanently or selectively coupled to a heater having a bifilar winding to reduce magnetic radiation; wherein the design of the system is such that voltages produced in the portable tool do not materially exceed 100 volts and are normally below 100 volts. The core of the transformer when employed in an arrangement wherein the secondary winding is permanently connected to the heater winding has a leg rotatable out of the closed core configuration whereby another leg of the core having the primary winding wound thereon may be inserted into the secondary winding. Alternatively the secondary winding may be wound on a short length of the core that is insertable into a leg of the transformer core on which the primary winding is wound.

Claims14

Dependent claims

A heater system comprising

a coupling member for producing fusion of members one to the other,
an eddy current, temperature self-regulating heater incorporated with said coupling member and having a regulated temperature to heat said member to fusion temperature below a temperature damaging to said coupling member,
said heater being comprised of a metallic structure which provides substantial resistance heating from skin effect when operated at high frequency,
a transformer having a soft magnetic core and primary and secondary windings disposable on said core,
means coupling said secondary winding to said heater structure,
said heater structure alone having a Q of between 0.5 and 5, said secondary winding having a reactance such that the ratio of its reactance to the resistance of the heater structure is between 1 and 20
a tool for applying heat to a load including at least said transformer core and said primary winding, and
means for connecting said primary winding to a source of high frequency current.

5 more elements

Dependencies are inferred from the claim text.

Induction heater system for fusing plastics

Life of this patent

Induction heater system for fusing plastics

Life of this patent

Abstract

Claims14