摘要:
The disclosure relates to pump dispensers, especially of the airless type in which the container interior reduces its volume progressively as product is dispensed to avoid air contact with the product, e.g. a medicine for oral dosing. One aim is to prevent any air in the container space above the product from reaching the pump inlet, and thereby possibly reducing a dispensed dose without the user being aware. To trap any such air and keep it away from the inlet throughout use of the dispenser, an air trap member (5) having a downwardly-convex dish form is provided below the floor of the dispenser module around the inlet (43), to guide any such air away from the inlet and to the periphery. At the outer edge of the air trap member (5) a steeply-sloping peripheral portion forms a retaining lip (53), which may make flexible wiping contact with the container wall interior, allowing air past on assembly of the dispenser. A central tubular formation (52) of the trap member (5) separates the trapped air from the inlet, and can be used to plug the trap member into the inlet. A sliding follower piston (15) may have an upward central boss (152) shaped to fit into the tubular formation (52) of the trap member (5) to maximise expulsion of product.
摘要:
Pump dispensers are specially adapted for inverted use. One feature, especially useful in a foam dispenser having both an air cylinder (5) and a liquid cylinder (6) with respective pistons, is an intake conduit arrangement to increase the clearance of liquid from the container. An intermediate shell (7) fits over the upright liquid cylinder body (6) and carries an inlet valve (73) positively urged upwardly to the closed position, to prevent leaking. A conduit shell (8) fits over the intermediate shell (7) and creates an intake conduit (85) extending down the side of the liquid cylinder to an intake opening (81) lower down the pump body.
摘要:
The application discloses dispenser pumps, preferably of the moveable-nozzle type, with means for sealing a vent path in the extended position of the pump plunger (2). The pump body (1) includes an internal collar (86) formed at the lower end of a tubular insert (8), through which the vent path passes. This collar has an annular seal portion (9). The plunger (2) has a complementary seal portion (4) which makes a guided and fitting engagement with the pump body collar seal portion (9) when the plunger (2) reaches its extended position relative to the body (1). One or both of the plunger seal portion (4) and the body collar seal portion (9) is formed as an annular taper, so that the seal portions are guided reliably into close engagement with one another without fine manufacturing tolerances being required. Plunger lock-down formations (27,85) may be formed to engage at the bottom of the body insert (8) as mentioned, so that they remain below the top opening of the body and the latter can be provided with a seal (16) at its top opening to act against the plunger stem (22) and keep the interior of the pump mechanism clean.
摘要:
The disclosure relates to pump dispensers, especially of the airless type in which the container interior reduces its volume progressively as product is dispensed to avoid air contact with the product, e.g. a medicine for oral dosing. One aim is to prevent any air in the container space above the product from reaching the pump inlet, and thereby possibly reducing a dispensed dose without the user being aware. To trap any such air and keep it away from the inlet throughout use of the dispenser, an air trap member (5) having a downwardly-convex dish form is provided below the floor of the dispenser module around the inlet (43), to guide any such air away from the inlet and to the periphery. At the outer edge of the air trap member (5) a steeply-sloping peripheral portion forms a retaining lip (53), which may make flexible wiping contact with the container wall interior, allowing air past on assembly of the dispenser. A central tubular formation (52) of the trap member (5) separates the trapped air from the inlet, and can be used to plug the trap member into the inlet. A sliding follower piston (15) may have an upward central boss (152) shaped to fit into the tubular formation (52) of the trap member (5) to maximise expulsion of product.
摘要:
Pump dispensers are specially adapted for inverted use. One feature, especially useful in a foam dispenser having both an air cylinder (5) and a liquid cylinder (6) with respective pistons, is an intake conduit arrangement to increase the clearance of liquid from the container. An intermediate shell (7) fits over the upright liquid cylinder body (6) and carries an inlet valve (73) positively urged upwardly to the closed position, to prevent leaking. A conduit shell (8) fits over the intermediate shell (7) and creates an intake conduit (85) extending down the side of the liquid cylinder to an intake opening (81) lower down the pump body.