Auto shut-off glue gun

B - Operations – Transporting – 05 – C

Patent

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Details

B05C 17/005 (2006.01) H01H 47/18 (2006.01)

Patent

CA 2314082

The present invention relates to a glue gun (10) for selectively supply molten adhesive. The glue gun comprises a housing (12), an actuator (16) movable between actuated and non-actuated positions, and a nozzle (18) configured to allow molten adhesive to flow therethrough. The housing includes an adhesive receiving chamber (27) fluidly communicating with the nozzle. The chamber (27) has an opening at one end thereof for allowing a supply of solidified adhesive to be inserted into said chamber. A heating element is associated with the chamber. The heating element (80) is operable to apply heat to the lead end portion of the solidified adhesive supply sufficient to melt the lead end portion when an electric signal is applied to the heating element. A heating element controller operates to allow the electric signal to flow to the heating element for a period of time after the actuator has been moved to its non-actuated position and to thereafter prevent the electric signal from flowing through the heating element at the end of the time period. The present invention also relates to a timing circuit for controlling the amount of time during which an electric signal is supplied to an operative element.

L'invention concerne un pistolet à colle (10) qui permet de distribuer sélectivement un adhésif fondu. Le pistolet comprend un boîtier (12), un actionneur (16), pouvant passer d'une position actionnée à une position non actionnée et inversement, et un embout configuré de façon à laisser passer l'adhésif fondu. Le boîtier comprend une chambre de réception (27) de l'adhésif en communication fluidique avec l'embout. La chambre présente à l'une de ses extrémités un orifice qui permet d'y introduire un adhésif solidifié. Un élément chauffant (80), associé à la chambre, permet d'appliquer à l'extrémité avant de l'alimentation en adhésif solidifié une chaleur suffisante pour la faire fondre quand un signal électrique est appliqué audit élément. Un organe de commande de l'élément chauffant fait passer un signal électrique dans ce dernier pendant un certain temps après que l'actionneur a été mis en position non actionnée, puis empêche ledit signal électrique de traverser ledit élément à la fin dudit temps. L'invention concerne également une minuterie qui permet de commander la durée pendant laquelle un signal électrique est fourni à un élément fonctionnel.

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