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EP-3613511-B1 - TRIGGER TYPE LIQUID SPRAYER

EP3613511B1EP 3613511 B1EP3613511 B1EP 3613511B1EP-3613511-B1

Inventors

  • KAKUTA, YOSHIYUKI

Dates

Publication Date
20260506
Application Date
20180419

Claims (4)

  1. A trigger type liquid ejector (1) comprising: an ejector main body (2) mounted on a container body in which a liquid is accommodated; and a nozzle member (3) disposed in front of the ejector main body and in which an ejection hole (4) configured to inject the liquid is formed, wherein the ejector main body includes: a vertical supply pipe (10) extending in an upward/downward direction and configured to suction the liquid in the container body; an ejection barrel (11) disposed in front of the vertical supply pipe and configured to guide the liquid in the vertical supply pipe into the ejection hole; and a trigger mechanism (50) having a trigger (51) disposed in front of the vertical supply pipe to be movable rearward in a state where the trigger is biased forward, the trigger mechanism being configured to cause the liquid to flow from an inside of the vertical supply pipe toward the ejection hole through an inside of the ejection barrel according to rearward movement of the trigger, wherein the trigger mechanism includes: a main piston (52) configured to move forward and rearward in conjunction with movement of the trigger; and a main cylinder (53) inside of which is compressed and decompressed according to movement of the main piston, the inside of the main cylinder coming in communication with the inside of the vertical supply pipe through a communication section (63), characterized in that the ejector main body includes: a reservoir cylinder (90) into which the liquid passing through the inside of the vertical supply pipe is supplied according to rearward movement of the trigger; a reservoir plunger (110) disposed in the reservoir cylinder to be movable in an axial direction along a central axis thereof, and moving to one side in the axial direction according to supply of the liquid into the reservoir cylinder while being biased toward the other side; a first check valve (36) configured to block communication between an inside of the container body and the inside of the vertical supply pipe when the inside of the main cylinder is pressurized, and allow communication between the inside of the container body and the inside of the vertical supply pipe when the inside of the main cylinder is decompressed; and a second check valve (102) configured to allow communication between the ejection hole and the inside of the vertical supply pipe when the inside of the main cylinder is pressurized, and block communication between the ejection hole and the inside of the vertical supply pipe when the inside of the main cylinder is decompressed, and a communication path (180) is provided between the main piston and the main cylinder, the communication path being configured to bring the inside of the main cylinder in communication with the inside of the container body when the main piston is moved to a position deviated rearward from a frontmost position.
  2. The trigger type liquid ejector according to claim 1, wherein the ejector main body includes an accumulator valve (122) configured to pressurize the liquid, and open to supply the pressurized liquid toward the ejection hole when a pressure of the liquid reaches a predetermined value.
  3. The trigger type liquid ejector according to claim 1 or 2, wherein a piston guide (62) with which the main piston closely slides is formed in the main cylinder, and the communication path is configured to bring the inside of the main cylinder in communication with the inside of the container body through a space between an inner circumferential surface of the main piston and an outer circumferential surface of the piston guide and an inside of the piston guide.
  4. The trigger type liquid ejector according to claim 3, wherein a lip section (72a) in close sliding contact with the outer circumferential surface of the piston guide is formed on the main piston, a recessed section (181) recessed toward an inner side of the piston guide and configured to accommodate the lip section is formed in a portion of the outer circumferential surface of the piston guide facing the lip section in a radial direction of the piston guide when the main piston is disposed at a rearmost position, and the communication path is configured to bring an inside of the main piston in communication with the inside of the piston guide through a gap between the lip section and the recessed section.

Description

Technical Field The present invention relates to a trigger type liquid ejector. Priority is claimed on Japanese Patent Application No. 2017-082872, filed April 19, 2017. Background Art A trigger type liquid ejector configured to suction a liquid from a container body and spray (eject) the liquid from a nozzle according to an operation of a trigger extending downward from the nozzle is known. For example, as disclosed in the following Patent Document 1, there is known a trigger type liquid ejector including a vertical supply pipe configured to suction a liquid in a container body, an ejection barrel extending forward from the vertical supply pipe, a trigger disposed to be movable rearward in a forward bias state and configured to inject the liquid toward an ejection hole through the vertical supply pipe and the ejection barrel according to rearward movement, a main piston that moves forward and rearward according to forward and rearward movement of the trigger, a main cylinder in communication with the vertical supply pipe, the inside of which is pressurized and decompressed according to forward and rearward movement of the main piston, a reservoir cylinder configured to store the liquid passing through the vertical supply pipe and the ejection barrel according to rearward movement of the trigger, and a reservoir plunger accommodated in the reservoir cylinder to be movable rearward in a forward bias state, wherein the reservoir cylinder and the ejection hole come in communication with each other through a communication hole. In the trigger type liquid ejector, the liquid can be introduced into the reservoir cylinder by moving the trigger rearward. Accordingly, the reservoir plunger can be moved rearward, the liquid can be guided to the ejection hole through the communication hole, and the liquid can be sprayed to the outside through the ejection hole. Accordingly, whenever the trigger is moved rearward, the reservoir plunger can be moved rearward and the reservoir cylinder can be filled with the liquid while spraying the liquid from the ejection hole. After the reservoir cylinder is filled with the liquid, when an operation of the trigger is stopped, since the reservoir plunger starts to move forward according to forward biasing, the liquid with which the reservoir cylinder is filled can be continuously injected from an injection hole through the communication hole. Accordingly, the liquid can be injected and continuous injection of the liquid can be performed not only when the trigger is operated but also when the trigger is not operated. The main piston is moved rearward in the main cylinder and the inside of the main cylinder is pressurized according to reward movement of the trigger. Accordingly, the liquid discharged from the main cylinder can be supplied into the reservoir cylinder, and the inside of the reservoir cylinder can be pressurized to move the reservoir plunger rearward against the forward biasing. After that, the main piston that has moved rearward is moved back forward in the main cylinder according to the trigger that is moved forward by the forward biasing. Accordingly, decompression can occur in the main cylinder such that the pressure becomes a negative pressure lower than the pressure in the container body, and the liquid in the container body can be suctioned into the main cylinder through the vertical supply pipe. WO2016/068191 and US2006/086763 patent applications each discloses a trigger type liquid ejector according to the preamble of main claim 1. Document of Related Art Patent Document Patent Document 1: Japanese Unexamined Patent Application, First Publication No. 2016-221457 Summary of Invention Technical Problem However, in the trigger type liquid ejector of the related art, decompression in the main cylinder may be insufficient, and there is room for improvement. In consideration of the above-mentioned circumstances, an object of the present invention is directed to providing a trigger type liquid ejector capable of reliably decompressing an inside of a main cylinder. Solution to Problem A trigger type liquid ejector according to an aspect of the present invention includes: an ejector main body mounted on a container body in which a liquid is accommodated; and a nozzle member disposed in front of the ejector main body and in which an ejection hole configured to inject the liquid is formed, in which the ejector main body includes: a vertical supply pipe extending in an upward/downward direction and configured to suction the liquid in the container body; an ejection barrel disposed in front of the vertical supply pipe and configured to guide the liquid in the vertical supply pipe into the ejection hole; and a trigger mechanism having a trigger disposed in front of the vertical supply pipe to be movable rearward in a state where the trigger is biased forward, the trigger mechanism being configured to cause the liquid to flow from an inside of the vertical supply pipe toward the