Dispenser pumps and dispensers
A dispenser pump has a plunger operable in a body including an outer cylinder body having a vent opening in its sidewall and a body insert fitting into the top of the outer body and providing an external collar through which the plunger stem operates. The body insert has lock-down threads to lock down the plunger for shipping. The insert also has formations for blocking or unblocking the vent opening by rotation between the outer body and body insert, driven by rotation of the plunger head which makes a catch engagement with the top of the body insert. This plunger head rotation is the locking or unlocking action for the plunger lock-down. Blocking the vent during shipping reduces leakage.
1. A dispensing pump comprising:
a plunger; and a body, having an outer body cylinder defining a pump chamber, and a body insert portion fitting into the top of the outer body cylinder; wherein the plunger includes a head, a stem and a piston and being rotatable relative to the body between axially locked and axially unlocked positions, including a locked-down position in which the plunger is held relatively retracted into the body; wherein a vent path is partially defined by a vent opening in the outer body cylinder; wherein the body insert rotates relative to the outer body cylinder between vent-blocked and vent-open relative positions in which the vent path is respectively blocked and open; and wherein the plunger initially drives relative rotation of the body insert and outer body cylinder to block or unblock the vent path and, after the body insert and outer body cylinder make a rotational stop engagement, drives relative rotation of the plunger and body insert to lock or unlock a mechanism for providing the locked-down position.
2. The dispenser pump according to claim 1 wherein the body insert has a vent-blocking portion which engages the outer body cylinder in the axially locked-down condition to block the vent opening, and is disengageable from the outer body cylinder in the axially unlocked condition to open the vent path.
3. The dispenser pump according to claim 2 wherein the body insert defines a recess or clearance which is brought into register with the vent opening of the outer body cylinder for the vent-open position.
4. The dispenser pump according to claim 1 wherein the locked-down position is provided by a threaded engagement between the plunger and the body.
5. The dispenser pump according to claim 1 wherein the body insert and the outer body cylinder each include cooperating formations or stop abutments formed at the interface between the body insert and the outer body cylinder, said formations or stop abutments engageable with one another to limit a range of relative rotational movement between the body insert and the outer body cylinder.
6. The dispenser pump according to claim 1 wherein the outer body cylinder includes a cylinder portion with a convergent upper wall having the vent opening and an annular locating flange to engage a container neck in use and wherein the body insert is secured rotatably to the outer body cylinder by way of a top retaining formation.
7. The dispenser pump according to claim 1 further comprising a securing cap attached to the body and a container for liquid product having a container neck connected to the securing cap.
8. The dispenser according to claim 7 wherein the outer body cylinder includes a locating flange to engage the container neck, said locating flange comprising a set of downward interlock projections which make an interlock engagement with the container neck to prevent rotation of the outer body cylinder relative to the container neck.
9. The dispenser according to claim 8 wherein the container neck includes cooperating projections.
10. The dispenser according to claim 7 wherein the outer body cylinder includes interlock projections which cooperate with corresponding projections on the container neck to prevent rotation of the outer body cylinder relative to the container neck.
11. The dispenser according to claim 4 wherein the threaded engagement is between the plunger and the body insert of the body.