| US 7,543,580 B1 | ||
| Heating device | ||
| John Paul Oglesby, Carlow (Ireland) | ||
| Assigned to Oglesby & Butler Research & Development Limited, Carlow (Ireland) | ||
| Appl. No. 10/48,019 PCT Filed Jul. 26, 2000, PCT No. PCT/IE00/00091 § 371(c)(1), (2), (4) Date Jun. 03, 2002, PCT Pub. No. WO01/07173, PCT Pub. Date Feb. 01, 2001. |
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| Claims priority of application No. S990634 (IE), filed on Jul. 26, 1999. | ||
| Int. Cl. B44D 3/16 (2006.01) | ||
| U.S. Cl. 126—401 [222/113] | 20 Claims |
| 1. A glue gun comprising:
a main housing defining a combustion chamber within which fuel gas is converted to heat for heating the main housing,
an exhaust gas port from the combustion chamber for exhausting burnt gases therefrom,
a working body member of heat conductive material in heat conducting engagement with the main housing for receiving heat therefrom,
the working body member defining an elongated heating chamber for receiving and melting hot melt glue therein,
a dispensing nozzle extending from the working body member communicating with the heating chamber for dispensing melted glue
therefrom,
an exhaust gas passageway located adjacent the dispensing nozzle and extending from the exhaust gas port to an exhaust gas
outlet for accommodating exhaust gases from the exhaust gas port to the exhaust gas outlet for transferring heat from the
exhaust gases to the dispensing nozzle, and
a plurality of spaced apart heat exchange fins in direct heat conducting contact with the dispensing nozzle, and extending
directly from the dispensing nozzle into the exhaust gas passageway to form the exhaust gas passageway into a circuitous exhaust
gas passageway through which the exhaust gases pass between the exhaust gas port and the exhaust gas outlet for transferring
heat from the exhaust gases to the dispensing nozzle.
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