| 摘要 |
A manually operable trigger pump has a pump body, a circular cap disposed below the body and adapted to engage a container having material to be pumped out, a generally vertical trigger pivotally coupled at its upper end to the body and a linkage coupled at one end to the trigger intermediate its ends and extending inclinedly upwards from the coupled end into the body. A locking device is securable to and is manually rotatable about the cap. A generally horizontal arm integral at one end with the device extends radially outward from the cap. The arm has a radially extending recess in its top surface. The device is rotatable to a locked position at which the other end of the arm is aligned with but is inwardly spaced from the trigger and the linkage engages the recess. At this point, when the trigger is squeezed, the movement between the trigger and the other end of the arm is insufficient to actuate the pump, but is large enough to raise the linkage partially out of the recess. However, if the means is rotated to move the other end of the arm out of alignment with the trigger while the trigger remains squeezed, the linkage will be raised completely out of the recess. The pump is then unlocked and can be operated normally.
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