Dispensing – With heating or cooling means – Heating only
Reexamination Certificate
1999-12-22
2001-05-15
Bomberg, Kenneth (Department: 3754)
Dispensing
With heating or cooling means
Heating only
C239S085000, C219S426000, C219S634000, C219S635000, C219S674000
Reexamination Certificate
active
06230936
ABSTRACT:
TECHNICAL FIELD
A method and apparatus for delivering melted material. More particularly, the apparatus is a glue gun utilizing a specially designed susceptor for increasing heat transfer to meltable material and, therefore, a production rate of melted material.
BACKGROUND OF THE INVENTION
Prior art devices have been utilized for heating and dispensing materials, such as for heating a solid material until it melts and then dispensing the material as a liquid. For example, hot glue guns are used for heating an end of a solid glue stick to a transition temperature at which the glue is liquified and then dispensing the melted glue through a dispensing orifice. Typically, a body is provided having an interior flow path through which the material is pushed as it is heated. Resistance heating elements are commonly used. The resistance heating elements have been mounted to the body outside of the flow path, and often outside of the body.
Other devices have utilized induction heating to heat materials for dispensing. A body is usually provided having an interior flow path through which the material is pushed as it is heated. An electromagnetically heated susceptor is located either directly in or immediately adjacent to the material flow path. Induction coils have been mounted outside of the body for inducing eddy currents to flow within the susceptor to generate heat for transferring to the materials. Often an external shroud is provided around the induction coil to protect an operator.
SUMMARY OF THE INVENTION
A glue gun system converts solid meltable glue into liquid glue for use on a work piece. In one embodiment the glue gun utilizes a stick of meltable material inserted within a body of the glue gun. In a second embodiment, the glue gun utilizes solid beads of glue that are delivered from a hopper, through a hose and to a body of the glue gun. In a second embodiment, the glue gun utilizes a stick of meltable material inserted within a body of the glue gun.
A nose assembly is provided on the forward end of the body. The nose assembly has a conical housing cone with a central orifice for delivery of the melted material to a workpiece. A conical inductor is received within the conical housing cone and also has a central orifice. The inductor is preferably a coil that surrounds the susceptor for heating a susceptor. The conical susceptor is received within the conical inductor. The conical susceptor has a plurality of holes formed thereon and defines a central orifice. The conical susceptor is electrically conductive and has folds to provide greater surface area for increasing heat transfer. The folds extend lengthwise from a base of the susceptor to an apex of the susceptor for increasing a ratio of surface area to mass. The folds, therefore, increase a speed of heat transfer from the susceptor to the meltable material. A conical displacement cone is received within the conical susceptor. A nozzle is positioned within the central orifice of the conical housing, the conical inductor and the conical susceptor. The nozzle permits a flow of meltable material through a plurality of peripheral passages. The peripheral passages are sized to permit a flow of meltable material under pressure but not to permit a flow of material when not under pressure.
REFERENCES:
patent: 4664296 (1987-05-01), Dziki
patent: 4948944 (1990-08-01), Oster
patent: 5584419 (1996-12-01), Lasko
Bomberg Kenneth
Bracewell & Patterson LLP
Bradley James E.
LandOfFree
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