Dispensing – With heating or cooling means – Heating only
Reexamination Certificate
1999-12-22
2001-05-01
Bomberg, Kenneth (Department: 3754)
Dispensing
With heating or cooling means
Heating only
C239S085000, C219S426000, C219S634000, C219S635000, C219S674000, C222S630000, C222S413000
Reexamination Certificate
active
06223950
ABSTRACT:
TECHNICAL FIELD
A method and apparatus for delivering melted material. More particularly, the apparatus is a glue gun utilizing a bulk feed to deliver meltable material, such as glue, to the apparatus for delivery of molten glue without unwanted drips and at a controlled temperature.
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 housing 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 housing outside of the flow path, and often outside of the housing.
Other devices have utilized induction heating to heat materials for dispensing. A housing 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 housing for inducing eddy currents to flow within the susceptors to generate heat for transferring to the materials. Often an external shroud is provided around the induction coil to protect an operator.
A difficulty with prior devices is that once the meltable materials have been melted and dispensed, it is difficult to cease flow of the meltable material without additional and unwanted drips emerging from the nozzle. The additional flow is partially due to a large orifice in the nozzle and to an area of high pressure resulting from compression of the meltable material from the pusher used to force a material towards the heating elements. An additional inconvenience associated with prior devices is that the apparatus may only be used for a limited amount of time before the glue stick must be replaced.
SUMMARY OF THE INVENTION
A glue gun system utilizes solid beads of glue that are delivered from a hopper through a hose with an airstream. The glue gun has a housing that contains a pervious barrier. The pervious barrier is provided for separating the beads from the airstream and for providing a load level control for detecting varying levels of the beads in the interior of the housing.
A handle is provided on the underside of the housing. A trigger mechanism is located on a forward side of the handle for activating a motor in the interior of the housing. A feed screw is operatively connected to a front end of the motor for forcing the beads towards the forward end of the housing.
A nose assembly is provided on the forward end of the housing. The nose assembly has a conical housing cone with a central orifice for delivery of the melted beads to a workpiece. A conical inductor is received within the conical housing cone and also has a central orifice. A conical susceptor is received within the conical inductor. The conical susceptor has a plurality of holes formed thereon and defines a central orifice. 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. A cable operatively connects the conical susceptor with a power source. A co-axial hose has a lead end, an interior passage and an exterior annulus. The co-axial hose passes through the handle into the interior of the housing for delivering beads of material to the interior of the housing through the interior passage. The exterior annulus of the hose is used for return delivery of the separated airstream.
A PC board has electronics for controlling the forward or rearward rotation of the feed screw and for controlling a flow of power over the cable to the conical susceptor, A hopper is provided for containing beads of the meltable material. The hopper is connected to a lead end of the co-axial hose. An electric metering device is located in the hopper for regulating the amount of beads delivered into the airstream within the interior passage of the co-axial hose.
REFERENCES:
patent: 2465283 (1949-03-01), Schlehr
patent: 3043480 (1962-07-01), Wittrock
patent: 3543968 (1970-12-01), Reighard
patent: 3677471 (1972-07-01), Deakin
patent: 3750905 (1973-08-01), Wolfrom
patent: 4197070 (1980-04-01), Koschmann
patent: 4804110 (1989-02-01), Sperry et al.
patent: 5005731 (1991-04-01), Koehler et al.
patent: 6042019 (2000-03-01), Rusch
Bomberg Kenneth
Bracewell & Patterson L.L.P.
Bradley James E.
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