| 摘要 |
A pumping device includes a main body having a passage defined therein through which air passes, a head, and a pivotal tube secured to the main body and rotatably received in a first end of the head. A second end of the head is communicated with the passage. The pivotal tube includes a hollow cam seat securely mounted therein. The cam seat includes a central rotating axis relative to the first end of the head. The cam seat further includes a first side with a first opening and a second side with a second opening communicated with the first opening. A distance from the central rotating axis of the cam seat to the first side is smaller than a distance from the central rotating axis of the cam seat to the second side. A retainer slidably received in the head and including a first compartment therein. A second end of the retainer includes a conical recess defined therein. A spring is mounted in the first compartment. A nozzle is slidably mounted in the second end of the retainer and includes an end attached to the spring. A pin is slidably mounted in the retainer and includes a first end extended beyond a first end of the retainer and a second end secured to the nozzle to slide therewith. The second opening of the cam seat is sized to prevent the first end of the pin from passing through the second opening, and the first opening of the cam seat is sized to allow the first end of the pin to pass through. A nozzle head is securely mounted in the second end of the head and includes a second compartment communicated with the first compartment via the nozzle. The nozzle head includes a hollow conical section for engaging with the conical recess of the retainer.
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