Device for the melting and measured discharge of a thermoplastic adhesive material

US4352442A · kind A · utility

Assignee

• Hilti Aktiengesellschaft · LI

Inventors

• Erich Leibhard · Munich, DE
• Hanno Richter · Möhrendorf, DE
• Gusztav Lang · Munich, DE
• Franz Popp · Großburgwedel, DE
• Heinz Goellnitz · Ottobrunn, DE

Key dates

• Filing date: Feb 21, 1980
• Grant date: Oct 5, 1982
• Expiry date: Feb 21, 2000

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B05C17/00526
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

In a device for the melting and measured discharge of a thermoplastic adhesive material, a melting chamber is enclosed by a heating coil. The adhesive material in solid rod form is supplied into the melting chamber through a sealing sleeve formed of a material such as polytetrafluoroethylene (TEFLON). A heating element is mounted on the bearing sleeve adjacent the melting chamber to heat up the sleeve and the material within it to a desired temperature. A switch or other member is connected to the heating element on the sleeve for discontinuing its supply of heat to the sleeve when the desired temperature is reached. The part of the sealing sleeve on the opposite side of the heating element from the melting chamber can be provided with some structure to dissipate or block the flow of heat through the sealing sleeve away from the melting chamber.