Pump structure for dispenser

Abstract

A pump structure for dispenser includes a base having a space defined therein and passing therethrough. The base has a vertical groove axially defined in an outer periphery thereof and a plurality of horizontal grooves parallelly defined in the outer periphery thereof and communicated with the horizontal grooves. A base ring is sleeved on the base. The base ring has a protrusion extending from an inner periphery thereof for slidably moving in the vertical groove and the horizontal groove. A saddle head is movably sleeved on the base. An upper valve set is mounted in a pathway in the saddle head and a lower valve set is mounted in the space in the base.

1 . A pump structure for dispenser comprising:
 a base adapted to assemble with a bottle, the base having a space defined therein and passing therethrough, the base having a vertical groove axially defined in an outer periphery thereof and a plurality of horizontal grooves parallelly defined in the outer periphery thereof, the vertical groove communicated with the horizontal grooves;   a base ring sleeved on the base, the base ring having a protrusion extending from an inner periphery thereof, the protrusion being slidably movable in the vertical groove and the horizontal grooves;   a saddle head movably sleeved on the base, the saddle head having a pathway defined therein and passing therethrough, the saddle head having a piston movably received in the space, the piston having an outer periphery abutting against an inner periphery of the space, a spring sleeved on the base, the spring having two ends respectively abutting against the saddle head and the base ring for providing a restitution force; and   an upper valve set mounted in the pathway and a lower valve set mounted in the space in the base, the upper valve set having a same structure with the lower valve set, each of the upper valve set and the lower valve set having an outer ring and an inner ring received in the outer ring, each outer ring having a plunger disposed therein and a plurality of ribs connected with the plunger and an inner periphery of the outer ring, each inner ring having a guiding path defined therein, the plunger of the outer ring being able to selectively seal the guiding path of the corresponding inner ring;   wherein when the saddle head is pressed, the piston presses the air in the space to push the plunger of the outer ring of the upper valve set such that the air is exhausted from the pathway in the saddle head, the plunger of the outer ring of the lower valve set pressed by the air to seal the guiding path of the inner ring;   when the saddle head is released and returned due to the restitution force of the spring, the piston of the upper valve set upwardly is moved such that the air pressure in the space is decreased to suck the outer ring of the lower valve set upwardly moved relative to the inner ring and to suck the liquid in the bottle flowing into the space via the guiding path in the inner ring of the lower valve set, in the meanwhile, the outer ring of the upper valve set downwardly sucked by the air pressure in the space such that the plunger is sealed the guiding path of the upper valve set;   when the saddle head is pressed again, the liquid in the space is able to be drained from the pathway for providing rationing liquid;   wherein when the base ring is axially moved relative to the base, the protrusion is moved along the vertical groove for adjusting a distance between the saddle head and the base ring such that an amount of the liquid drained from the space is adjusted;   when the base ring is rotated relative to the base, the protrusion is moved along one of the plurality of the horizontal grooves for fixing the distance between the saddle head and the base ring.   
     
     
         2 . The pump structure for dispenser as claimed in  claim 1 , wherein the saddle head has a seat mounted in interior thereof for receiving the upper valve set, the piston sleeved on a bottom end of the seat, the saddle head having a skirt downwardly formed thereon, the base located between the skirt and the seat. 
     
     
         3 . The pump structure for dispenser as claimed in  claim 1 , wherein the base ring has an indicator disposed thereon and corresponding to a location of the protrusion. 
     
     
         4 . The pump structure for dispenser as claimed in  claim 1 , wherein at least one of the horizontal grooves extending toward a direction opposite to the other horizontal grooves such that the base ring is able to be bidirectionally rotated. 
     
     
         5 . The pump structure for dispenser as claimed in  claim 1 , wherein the saddle head has a flange annularly and outwardly extending therefrom, the two ends of the spring respectively abutted against the base ring and the flange. 
     
     
         6 . The pump structure for dispenser as claimed in  claim 2 , wherein the base has a dove-tail flange annularly and outwardly extending therefrom, the skirt having a dove-tail flange annularly and inwardly extending therefrom for corresponding to the dove-tail flange of the base such that the dove-tail flange of the base and the dove-tail flange of the skirt are buckled to each other for preventing the saddle head detaching from the base.