Apparatus for dispensing heated fluid materials

The method of dispensing a heated polymeric material comprising the steps of:

• directing the flow of said polymeric material through a bore containing a plunger slidably mounted and contained therein;
• causing a coil assembly to generate an electromagnetic field for effectuating a movement of the plunger from a closed to an open position, such that the polymeric material is directed past the plunger and discharged from a discharge orifice;
• and
• transferring heat from the coil assembly to the ambient air.

An apparatus for dispensing heated fluid materials comprising:

• a housing defining a fluid chamber, the fluid chamber extending from a first end to an outlet at a second end;
• a fixed pole disposed at the first end of the fluid chamber and extending away therefrom, wherein a portion of said fixed pole is in fluid contact with the fluid material within the fluid chamber;
• an inlet means for coupling the fluid chamber to a source of heated fluid material;
• a coil for generating an electromagnetic field, disposed about a portion of the fixed pole such that a portion of the pole extends beyond the coil to space the coil from the first end of the fluid chamber;
• and
• a plunger disposed within the fluid chamber adjacent to the fixed pole and mounted for reciprocal movement therein between closed and retracted positions when subjected to said electromagnetic field, such that when said plunger is in said closed position the outlet is blocked to prevent fluid flow therefrom and in said retracted position fluid flow is emitted from the outlet.

An apparatus for dispensing heated fluid materials comprising:

• a housing defining a fluid chamber;
• an inlet means coupled to the fluid chamber for receiving heated fluid material;
• an outlet means, coupled to the fluid chamber for dispensing heated fluid material therefrom;
• a moveable means disposed within the fluid chamber and mounted for reciprocal movement therein between a closed position and an open position for opening or closing the outlet means;
• a fixed pole, mounted adjacent to the moveable means;
• a coil means, disposed about a portion of said fixed pole, for generating an electromagnetic field and inducing magnetic poles in the fixed pole and the moveable means;
• means for thermally insulating the coil means from the fluid chamber;
• and
• means coupled to the coil means, for dissipating heat from said coil means.

An apparatus for dispensing heated fluid materials comprising:

• an inlet means for receiving the heated fluid materials;
• a means for generating an electromagnetic field;
• an outlet means, coupled to the inlet means, for dispensing said heated fluid materials therefrom;
• a means movable from a first position to a second position in response to the generated electromagnetic field, wherein the dispensing of said heated fluid material is blocked in said first position and wherein said heated fluid material flows from said outlet means in said second position;
• and
• a heat dissipating means for removing heat from the means for generating the electromagnetic field.

An apparatus for dispensing hot melt adhesive comprising:

• a housing defining a fluid chamber;
• an inlet means for coupling the fluid chamber to a source of hot melt adhesive;
• a fixed pole extending into said fluid chamber such that a portion of an external surface of said fixed pole is in fluid communication with the adhesive, but preventing the flow of said hot melt adhesive through said pole;
• a coil for generating an electromagnetic field, disposed about a portion of the fixed pole and spaced from said fluid chamber;
• an insulating means, disposed between said fluid chamber and said coil for thermally insulating the coil from the fluid chamber;
• a plunger disposed within the fluid chamber and mounted for reciprocal movement between a closed position and an open position, said plunger comprising a first portion, having a diameter closely approximating a diameter of the fluid chamber, and a second portion having a reduced diameter and extending from the first portion, the second portion including an engaging means for mating with a surface in the closed position, said plunger being spaced from said fixed pole in said closed position and adjacent to said fixed pole in said open position;
• at least one bypass flow channel, carried by said housing, for allowing the adhesive to flow past the first portion of the plunger;
• a means for biasing the plunger in the closed position;
• a discharge opening coupled to said fluid chamber;
• and wherein, in response to said electromagnetic field, the plunger moves from the closed to the open position such that adhesive is dispensed therefrom.