| 摘要 |
<p>A hot melt gun having a melt body with a melt chamber and a feeding device for feeding a rod of hot melt material in solid form, under the control of an operator, into the melt chamber. A carriage supports the rod of hot melt material and a clamp member and a trigger are provided to grip the rod and feed it into the hot melt chamber. The improvement in the hot melt gun resides in that the clamp member has two axial pivot pins integral therewith and projecting outwardly from opposite sides thereof with each pin having an arcuate coaxial bearing portion and a chordal flat face. The carriage has two opposite sides each having one of the coaxial bearing openings to receive the pivot pins. The bearing openings are defined by substantially circular bearing surfaces against which the bearing portions of the pins are supported. Each bearing surface has an assembly opening extending around a minor arc in the surface remote from the rod of hot melt material supported by the carriage. The width of the assembly openings is slightly larger than the distance between the flat faces of the pivot pins so that, during assembly of the gun, the pivot pins pass through the assembly openings with narrow clearance when the pins are oriented with the flat faces generally parallel to a radius of the bearing openings bisecting the assembly openings, but so that, when the gun is fully assembled, the arc of pivotal movement of the clamp member is restricted and the pivot pins cannot reach an orientation where the flat faces are sufficiently aligned with the assembly openings to permit withdrawal of the pivot pins through the openings.</p> |
