| 摘要 |
<p>A gun for applying mastic material especially butyl mastic sealant comprises a barrel (1) for receiving mastic material (M), e.g. in a cartridge (2), the barrel (1) having electric heater means (10) about it for heat softening the mastic material (M) so that on application of pressure to the softened mastic material (M) it is ejected from the nozzle (7) in suitable form for application. As shown pressure is applied to the mastic material (M) by air under pressure admitted to the rear of the barrel (1) through a trigger operated valve (31), the air acting on an internal rear closure (22) of the cartridge container (20). The nozzle (7) is detachable for front end loading of a cartridge (2) in the barrel (1), a rear part (77) of the nozzle (7) piercing the forward end of the cartridge container (20) when the nozzle (7) is remounted on the barrel (1). An outer casing (11) is heat insulated from the heating means (10) by an air space (A).</p> |
