Manually operated pump

1 . A manually operated pump ( 1 ), comprising

a cup-shaped body ( 2 ) inside which a piston ( 3 ) associated with a hollow stem ( 4 ) for its movement in the cup-shaped body ( 2 ) sealingly slides,

the manually operated pump ( 1 ) having a base ( 5 ), which closes the cup-shaped body ( 2 ), the base ( 5 ) having a hole ( 11 ) for the stem ( 4 ),

the stem ( 4 ) and the base ( 5 ) being torsionally coupled,

at least part of the cup shaped-body ( 2 ) and of the piston ( 3 ) defining a compression chamber ( 6 ) associated with at least one suction valve element ( 8 ) and a delivery valve element ( 9 ),

the delivery valve element ( 9 ) being in communication with a cavity ( 4 A) of the stem ( 4 ),

a dispensing button ( 10 ) being sealingly fitted on the stem ( 4 ), the dispensing button ( 10 ) and the stem ( 4 ) being mutually constrained so that the dispensing button ( 10 ) limitedly rotates with respect to an axis (A) of the stem ( 4 ) between a first dispensing position and a second closing position in which at least one tooth (D) of the dispensing button ( 10 ) stops against a surface ( 13 ) of a ring nut ( 12 ) so as to prevent a stroke of the stem ( 4 ),

the manually operated pump ( 1 ) being characterized in that the ring nut ( 12 ) is configured to be coupled torsionally to the base ( 5 ) or to the cup-shaped body ( 2 ) in at least two alternative mounting positions, such that,

if the ring nut ( 12 ) is in its first mounting position and the dispensing button ( 10 ) is in the dispensing position, a first groove (S 1 ) of the ring nut ( 12 ) faces the tooth (D) which can slide in it up to a first stop (F 1 ), allowing a first stroke of the stem ( 4 ) and that,

if the ring nut ( 12 ) is in its second mounting position and the dispensing button ( 10 ) is in the dispensing position, a second groove (S 2 ) of the ring nut ( 12 ) faces the tooth (D) which can slide in it up to a second stop (F 2 ), allowing a second stroke of the stem ( 4 ) different from the first stroke of the stem ( 4 ), so that, during the assembly of the manually operated pump ( 1 ) the positioning of the ring nut ( 12 ) in the first or second mounting position determines a first or a second delivery volume of the manually operated pump ( 1 ).

2 . The manually operated pump ( 1 ) according to claim 1 ,

wherein the base ( 5 ) is configured to be torsionally coupled to the cup-shaped body ( 2 ) in at least two alternative mounting angular positions, such that,

if the base ( 5 ) is in its first mounting position, between the base ( 5 ) and the cup-shaped body ( 2 ), a passage (P) is open which puts the outside of the manually operated pump ( 1 ) in communication, at least for some positions of the piston ( 3 ), with the outside of the cup-shaped body ( 2 ), the manually operated pump ( 1 ) being in a vented configuration,

while if the base ( 5 ) is in its second mounting position, said passage (P) is closed and the manually operated pump ( 1 ) is of a hermetic type.

3 . The manually operated pump ( 1 ) according to claim 1 ,

wherein, when the dispensing button ( 10 ) is in said second closing position, a cavity ( 4 A) of the stem ( 4 ) is isolated from a delivery port ( 10 A) of the dispensing button ( 10 ).

4 . The manually operated pump ( 1 ) according to claim 1 ,

in which the piston ( 3 ) is slidably fitted on the stem ( 4 ) and defines, in cooperation with the stem ( 4 ) itself, the delivery valve element ( 9 ).

5 . The manually operated pump ( 1 ) according to claim 1 ,

wherein the stem ( 4 ) has a guide ( 21 ) engaged in a counter-guide ( 20 ) of the base ( 5 ) to make said torsional coupling.

6 . The manually operated pump ( 1 ) according to claim 1 ,

wherein the base ( 5 ) has an alignment tooth ( 22 ) which can be engaged alternatively in a first seat ( 23 A) or in a second seat ( 23 B) of the ring nut ( 12 ), so that

when the alignment tooth ( 22 ) is engaged in the first seat ( 23 A), the manually operated pump ( 1 ) is in said first mounting position,

while when the alignment tooth ( 22 ) is engaged in the second seat, the manually operated pump ( 1 ) is in said second mounting position.

7 . The manually operated pump ( 1 ) according to claim 1 ,

wherein the ring nut ( 12 ) has an annular seat ( 12 A) in which a skirt ( 10 B) of the dispensing button ( 10 ) slides.

8 . The manually operated pump ( 1 ) according to claim 1 ,

wherein the base ( 5 ) is snap-engaged with the ring nut ( 12 ).

9 . The manually operated pump ( 1 ) according to claim 1 ,

wherein the base ( 5 ) provides a flange ( 5 A) sandwiched between the ring nut ( 12 ) and the cup-shaped body ( 2 ).

10 . The manually operated pump ( 1 ) according to claim 2 ,

wherein one between the base ( 5 ) and the cup-shaped body ( 2 ) has a projection ( 30 ) configured to sealingly intercept a passage (P) made in the other between the cup-shaped body ( 2 ) and the base ( 5 ), when the base ( 5 ) is in its second mounting position.

11 . The manually operated pump ( 1 ) according to claim 10 ,

wherein another between the cup-shaped body ( 2 ) and the base ( 5 ) provides a further seat ( 35 ) configured to house said projection ( 30 ) when the base ( 5 ) is in its first mounting position.

12 . The manually operated pump ( 1 ) according to claim 11 ,

wherein, in correspondence with said passage (P) there is a compartment ( 36 ) configured to house said projection ( 30 ) or a filter that filters the air flowing in said passage (P).

13 . The manually operated pump according to claim 2 ,

wherein the base ( 5 ) and the piston ( 3 ) each have a sealing coupling surface ( 3 A, 37 ) configured to intercept the passage (P) when the stem ( 4 ) is in its upper end-of-stroke position.

14 . The manually operated pump ( 1 ) according to claim 9 ,

wherein the cup-shaped body ( 2 ) is in turn equipped with a further flange ( 2 A) destined to abut, through a gasket (G), on a free surface of a mouth (B), a container (C) to which the manually operated pump ( 1 ) will be coupled during use.