ELECTRICALLY OPERATED MATERIAL DISPENSING GUN AND METHOD

摘要

An electrically actuated material dispensing gun (10) is disclosed having a body including a handle section (11) and an elongate cartridge support section (12) extending outwardly from the handle section (11). The cartridge support section (12) includes a cartridge support space and an apertured end wall (15) for receiving a cartridge dispensing nozzle and for dispensing force resisting engagement with a dispensing end of a cartridge positioned in the space. A reciprocatable push rod (24) is carried by the handle section (11) and axially aligned with the space for force transmitting engagement with a piston (25) which in one embodiment is of unique construction. An electric motor (28) is mounted in the handle section (11). A drive element (50) is rotatively mounted in the handle section (11) and in positive drive, mechanically interconnected, relationship with the rod (24). The drive element (50) is normally freely rotatable in response to axial motion of the rod (24). A power train (36) including a planetary is connected to the output shaft of the motor (28). In one embodiment a drive transmission clutch is provided for automatically interconnecting the drive element (50) and the power train (36) and for transmission of driving forces when so interconnected and when the output shaft is rotated in response to motor energization. In another embodiment a manually actuated plunger selectively completes the drive train. A trigger (54) is carried by the handle section (11) and is operably connected to an on/off switch (58) selectively to complete a motor energization circuit. The trigger (54) also coacts with the clutch to cause such automatic interconnection of the planetary (36) and the drive element (50) when the motor (28) is energized.