A push-type nozzle assembly includes a cylinder, a check valve, a plunger, a piston, a spring, a rotating member, a locking member, an upper push rod, a suction valve and a push head. When pushing the push head downward, and the outer chamber contact the locking member, the liquid in the cylinder is pushed out. When releasing the push head, the piston moves back by the spring to create a vacuum suction force to suck the liquid left in the nozzle back. When the outer chamber locks with the locking member, the bottom end of the piston rod seals the plunger to seal the cylinder so as to prevent leakage. When the outer chamber is separated from the locking member, the upper push rod seals the suction valve to avoid liquid from leakage. The inlet valve avoids the liquid from being accumulated in the cylinder and the top of the piston.

BACKGROUND OF THE INVENTION

1. Fields of the Invention

The present invention relates to a push-type nozzle assembly, and more particularly, to a push-type nozzle assembly for ejecting liquid in the bottle.

2. Description of Related Art

The conventional push-type nozzle assembly is used widely in everyday life such as body wash, lotion, shampoo, laundry detergent, cleaning detergent, and the push-type nozzle assembly is easily used by pushing the push-type nozzle assembly to get liquid from the bottle to which the push-type nozzle assembly is connected.

FIG. 1discloses a push-type nozzle assembly100awhich includes a push head101awhich is securely connected to a bottle102aso as to prevent the liquid in the bottle102afrom leaking from the push head101a. However, when the push head101ais under a pushed status, the passage104ain the push head101ais opened, and once the bottle102atilts, the liquid in the bottle102aflows through the passage104aor other gaps leaks. Furthermore, after releasing the push head101a, there will be some liquid residue left in the outlet105aof the push head101a. The liquid residue will flow from the outlet105adue to gravity. The leakage problem happens during transportation of the push-type nozzle assemblies. When the bottle102atilts, the liquid in the bottle102aeasily flows into the cylinder106avia the air releasing holes, and is easily accumulated at the piston103a. This increases risk of leakage.

The present invention intends to provide a push-type nozzle assembly that eliminates the drawbacks mentioned above.

SUMMARY OF THE INVENTION

The present invention relates to a push-type nozzle assembly and comprises a cylinder having a recess defied in the inner bottom end thereof, and an entrance is formed around the recess.

A check valve is located in the recess to open and close the entrance.

A plunger is a hollow plunger, and includes a first insertion and a second insertion, wherein the second insertion extends through the check valve and is inserted into the recess. The first insertion is located above the check valve.

A piston is a hollow piston and located in the cylinder. The piston includes a piston rod and a piston head that is integrally connected to the piston rod. The piston head is located corresponding to the first insertion. The piston head is reciprocally movable along the inner periphery of the cylinder. When the piston head moves to the first insertion, the first insertion seals the bottom end of the piston rod.

A spring is mounted to the piston rod so as to create a spring force for returning.

A rotating member is mounted to the upper portion of the cylinder and connected with a bottle.

A locking member is a hollow member and inserted into the cylinder.

An upper push rod includes an upper tube and a bottom tube which is larger than the upper tube. The bottom tube extends through the locking member. The top end of the spring is located in the bottom tube, and the bottom end of the spring is located in the inner bottom of the locking member. The upper tube is mounted to the top end of the piston rod.

A suction valve extends through the upper tube and is located in the top end of the piston rod. The top end of the suction valve is located above the upper tube.

A push head includes an inner chamber, an outer chamber and a nozzle which communicates with the inner chamber. The inner chamber includes a first locking portion formed therein. A pre-set distance is formed between the first locking portion and the top end of the inner chamber. The outer chamber has a second locking portion. The upper tube has a third locking portion formed on the outer surface thereof. The first and third locking portions are locked to each other. The locking member has a fourth locking portion formed on the outer surface thereof, and the second and fourth locking portions are locked to each other.

In one embodiment, the locking member includes a neck extending from the lower end thereof, and the neck is smaller than the locking member. An inlet valve includes an upper portion and a bottom portion which is smaller than the upper portion. The inlet valve is connected to the neck.

In one embodiment, the inlet valve includes a first ridge formed in the inner periphery thereof. The neck includes a second ridge which is engaged with the first ridge.

In one embodiment, the first insertion includes a seal ring mounted to the outside thereof, and the seal ring seals the bottom end of the piston rod.

In one embodiment, the upper tube includes an annular ring in an inner periphery thereof. The piston rod includes a first groove defined in an outer periphery of the top end thereof. The annular ring is engaged with the first groove.

In one embodiment, the suction valve includes a first-stage path, a second-stage path and a third-stage path. The first-stage path, the second-stage path and the third-stage path are integrally formed with each other. The inner diameter of the first-stage path is larger than the inner diameter of the upper tube. The inner diameter of the second-stage path is smaller than the inner diameter of the upper tube. The inner diameter of the third-stage path is smaller than the diameter of the piston rod. The third-stage path includes a restriction ridge formed on the outside thereof. The suction valve is connected to the top end of the piston rod by the restriction ridge.

In one embodiment, the first-stage path includes an annular outlet defined in the underside thereof. The upper tube includes a second groove defined in the top end thereof. The annular outlet is engaged with a wall defining the second groove.

In one embodiment, the check valve is a round valve and includes a through hole through which the second insertion extends. A receiving wall extends around the periphery of the through hole and the first insertion is engaged within the receiving wall.

In one embodiment, the check valve includes a disk and a protrusion which integrally extends from the underside of the disk. The disk includes a port through which the second insertion extends. The protrusion includes a cavity in which the second insertion is inserted.

In one embodiment, the disk of the check valve includes multiple ribs formed on the top end thereof. The disk of the check valve rested on the inner bottom of the cylinder.

The advantages of the present invention are that when pushing the push head downward to let the outer chamber contact the locking member, the liquid in the cylinder is pushed out. When releasing the push head, the piston moves back by the spring to create a vacuum suction force. Because the upper push rod and the suction valve are delayed for a period of time to be sealed, the vacuum suction force sucks the liquid left in the nozzle back. When the second locking portion of the outer chamber locks with fourth locking portion of the locking member, because the piston rod and the piston head are integral with each other, and the bottom end of the piston rod seals the plunger so that the cylinder is completely sealed, and the liquid in the bottle cannot leak from the annular outlet. When the bottle tilts, the inlet valve prevents the liquid in the bottle from flowing into the cylinder and being accumulated in the top of the piston head via the air releasing holes of the cylinder. This avoid leakage from the bottle. When the outer chamber is separated from the outer surface of the locking member, and the push head is located at its highest position, the upper push rod seals the suction valve to avoid liquid from leakage from the annular outlet.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring toFIGS. 2 and 3, the push-type nozzle assembly of the present invention comprises a cylinder1, a check valve2, a plunger3, a piston4, a spring5, a rotating member6, a locking member7, an upper push rod8, a suction valve9and a push head10.

The cylinder1is a tubular cylinder and includes a body11and a port12which is smaller than the body11. The body11has a connection portion13at the top end thereof, and the connection portion13has ridges extending from the outer surface thereof. A flange14extends from the outer surface of the connection portion13and located beneath the ridges. A recess15is defined in the inner bottom of the body11. The port12located below the recess15. The port12includes a larger upper section and a smaller lower section. The port12communicates with an open end at the lower end thereof.

The check valve2is located in the recess15. An entrance16is formed between the check valve2and the recess15. The check valve2controls the opening and the closing the entrance16. In this embodiment, the check valve2is a round valve and matched with the recess15.

In one embodiment, the check valve2includes a disk21and a protrusion22which integrally extends from an underside of the disk21. A passage17is formed in the bottom of the cylinder1and communicates with the entrance16that is located above the passage17. The protrusion22extends through the passage17. The disk21is located in the recess15as shown inFIG. 4.

In one embodiment, in order to reinforce the sealing feature of the disk21of the check valve2to the entrance16, the disk21that is located in the recess15of the body11includes multiple ribs23formed spaced apart from each other on the top end thereof as shown inFIG. 5.

The plunger3is a hollow plunger and includes a first insertion31and a second insertion32. When the check valve2is an individual disk, the check valve2includes a through hole through which the second insertion32extends. A receiving wall extends around the periphery of the through hole and the first insertion31is engaged within the receiving wall. The second insertion32extends through the check valve2and inserted into the passage17. The check valve2includes a disk21and a protrusion22which integrally extends from the underside of the disk21, the disk21includes a port through which the second insertion32extends, and the protrusion22includes a cavity in which the second insertion32is inserted. The second insertion32extends through the check valve2and inserted into the cavity.

The piston4is a hollow piston and located in the body11. The piston4includes a piston rod41and a piston head42that is integrally connected to the piston rod41. The piston head42is located corresponding to the first insertion31. The piston head42is reciprocally movable along the inner periphery of the body11. When the piston head42moves to the first insertion31, the first insertion31is inserted into and seals the bottom end of the piston rod41. Furthermore, in order to provide a better sealing feature between the first insertion31and the piston rod41, the first insertion31includes a seal ring311mounted to the outside thereof. When the bottom end of the piston rod41is mounted to the first insertion31, the seal ring311seals the bottom end of the piston rod41.

The spring5is mounted to the piston rod41so as to create a spring force to return the piston rod41.

The rotating member6has a through passage and is mounted to the upper portion of the body11and rested on the flange14. The rotating member6includes inner threads61so as to be connected with a bottle.

The locking member7is a hollow member and includes a mounting portion71and a tubular part72, wherein the mounting portion71is mounted to the connection portion13of the cylinder1, and the tubular part72is located in the body11. The mounting portion71includes inner ridges on the inside thereof so as to be threadedly connected to the ridges of the connection portion13. The tubular part72includes a neck73which includes an upper wider portion and a narrow lower portion. The neck73includes an inner tube74located therein which is connected to the piston rod41. There is a room75between the inner tube74and the inside of the neck73. The bottom end of the spring5is located in the room75. The piston head42includes a restriction portion421on the top edge thereof, and the neck73has a stop731on the bottom edge thereof. When the piston4moves upward by the spring5, and the restriction portion421contacts the inlet valve20to restrict continuous movement of the piston4.

The upper push rod8is a hollow tube and has an upper tube81and a bottom tube82which is larger than the upper tube81. The bottom tube82extends into the tubular part72. The top end of the spring5is located in the bottom tube82, and the bottom end of the spring5is located in an inner bottom of the locking member7. The spring5is restricted between the bottom tube82and the room75. The upper tube81is mounted to the top end of the piston rod41. In order to allow the upper push rod8to drive the piston rod41to move downward, the upper tube81includes an annular ring83in the inner periphery thereof. The piston rod41includes a first groove411defined in an outer periphery of the top end thereof. When the upper push rod8moves downward, the annular ring83is engaged with the first groove411so as to drive the piston rod41downward.

The suction valve9includes a first-stage path91, a second-stage path92and a third-stage path93. The first-stage path91, the second-stage path92and the third-stage path93are integrally formed with each other. The inner diameter of the first-stage path91is larger than the inner diameter of the upper tube81. The inner diameter of the second-stage path92is smaller than the inner diameter of the upper tube81. The inner diameter of the third-stage path93is smaller than the diameter of the piston rod41. The third-stage path93includes a restriction ridge931formed on the outside thereof. The suction valve9is connected to the top end of the piston rod41by the restriction ridge931. The second-stage path92is located in the upper tube81. The first-stage path91is located above the upper tube81. The third-stage path93uses the restriction ridge931to contact the top end of the piston rod41. The upper tube81moves up and down in the second-stage path92.

The first-stage path91includes an annular outlet911defined in the underside thereof. The upper tube81includes a second groove811defined in the top end thereof. The annular outlet911is engaged with the wall defining the second groove811. The upper tube81moves upward by the spring5, the annular outlet911is engaged with the wall defining the second groove811, the suction valve9is shut off. On the contrary, when the upper tube81moves downward by the spring5, the annular outlet911is disengaged from the wall defining the second groove811, the suction valve9is opened.

The push head10includes an inner chamber101, an outer chamber102and a nozzle103which communicates with the inner chamber101. The inner chamber101includes a first locking portion1011formed therein. A pre-set distance is formed between the first locking portion1011and the top end of the inner chamber101. The outer chamber102has a second locking portion1021. The upper tube81has a third locking portion84formed on the outer surface thereof. The first and third locking portions1011,84are locked to each other. The locking member7has a fourth locking portion76formed on the outer surface thereof. The second and fourth locking portions1021,76are locked to each other.

The push head10is locked with the upper push rod8by the connection between the first and third locking portions1011,84. In the meanwhile, there is a space104formed between the top end of the upper push rod8and the top of the inner chamber101.

In order to prevent the liquid in the bottle leaks from the air releasing holes and flows into the body11and being accumulated at the top end of the piston head42, the push-type nozzle assembly includes an inlet valve20which is connected to the neck73of the locking member7. Specifically, the inlet valve20includes a first ridge201formed in the inner periphery thereof, and the neck73includes a second ridge77which is threadedly engaged with the first ridge201.

When in use, the push head10is pushed to move the upper push rod8downward. In the travel S1of the space104, the piston head42is stationary due to friction with the inner wall of the body11, so that the piston rod41does not move, and the annular outlet911is gradually opened. When the travel S1finishes, the annular outlet911is completely opened. The push head10is continuously pushed, the annular ring83is engaged with the firs groove411, and the push head10drives the upper push rod8, the piston rod41and the suction valve9downward, until the outer chamber102contacts the mounting portion71. When the travel S2is finished, during this travel, the piston head42compresses the interior space of the body11. The check valve2seals the entrance16due to change of pressure, so that the liquid in the body11flows into the piston rod41and then flows to the nozzle103via the annular outlet911. The liquid eventually is ejected from the nozzle103as shown inFIGS. 6 to 8.

When releasing the push head10, the upper push rod8moves upward by the spring5, and the piston rod41and the piston head42are stationary due to friction with the inner wall of the body11. The annular outlet911is gradually closed. The push head10is continuously moved upward by the upper push rod8, and the upper push rod8drives the suction valve9and the piston rod41upward. The liquid in the bottle is affected by the vacuum suction force and starts to flow through the port12of the cylinder1. The liquid pushes the check valve2and opens the entrance16and enters into the lower portion of the body11, until the restriction portion421of the piston head42contacts the inlet valve20, to return to its initial position and ready for next pushing.

When the push head10is released, the upper push rod8moves upward by the spring5, so that the piston rod41and the piston head42are stationary due to friction with the inner wall of the body11. The annular outlet911is gradually closed. A vacuum suction force is formed in the space104so as to suck the liquid left in the nozzle103. Therefore, the liquid will drip from the nozzle103due to gravity.

When pushing the push head10and complete the travels S1and S2, the push head10continues to move downward of the travel S3. The second locking portion1021of the outer chamber102is locked with the fourth locking portion76of the mounting portion71. The piston rod41is sealed with the first insertion31, so that the area below the piston head42in the body11is sealed. Even when the bottle tilts, the liquid in the bottle cannot not leak from the entrance16of the cylinder1as shown inFIG. 9.

When no force is applied to the push head10, the annular outlet911is engaged with the wall defining the second groove811due to the spring5, so that even when the bottle tilts or receives a force applied thereto, the liquid in the bottle cannot leak from the annular outlet911of the suction valve9.