| 摘要 |
PROBLEM TO BE SOLVED: To improve the sliding property of a piston by setting the piston as to keep a gap in a part of the circumference of a spring supporting cylinder during the time when the piston is slid in a pump cylinder, regarding a discharging apparatus, which discharges a liquid material through a discharge nozzle by pushing in the piston to the pump cylinder. SOLUTION: The trigger type discharging apparatus 10 discharges a paste, coating agent, etc., through a nozzle hole 28A of a discharging nozzle 28, a pump chamber 22 is formed in a pump cylinder 15A, and a piston 23 is liquid- tightly housed in the pump cylinder 15A in a manner that the piston can freely slide. In this case, during the time when the piston 23 slides in the pump cylinder 15A, the piston 23 is so set as to keep a gap G from the whole circumference of a spring supporting cylinder 15B. Moreover, a remaining pressure removing hole 41 is formed inside the spring supporting cylinder 15B on the end face facing the piston sliding direction of the pump cylinder 15A and through the remaining pressure removing hole 41 communicates a pump chamber 22 and a liquid flowing route 18. Consequently, the sliding property of the piston 23 in the pump cylinder 15A is improved. |
