Patent Publication Number: US-11045821-B2

Title: Trigger type liquid ejector

Description:
TECHNICAL FIELD 
     The present invention relates to a trigger type liquid ejector. 
     Priority is claimed on Japanese Patent Application No. 2017-082872, filed Apr. 19, 2017, the content of which is incorporated herein by reference. 
     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. 
     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 ejection hole through an inside of the ejection barrel according to rearward movement of the trigger, in which the trigger mechanism includes: a main piston configured to move forward and rearward in conjunction with movement of the trigger; and a main cylinder inside of which is compressed and decompressed according to movement of the main piston, the inside of the main cylinder coining in communication with the inside of the vertical supply pipe through a communication section, in which the ejector main body includes: a reservoir cylinder 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 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 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 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 in which a communication path 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. 
     When the trigger is mounted on the container body in which the liquid is accommodated and is pulled rearward and moved, the main piston is moved rearward from the frontmost position to pressurize the inside of the main cylinder. Accordingly, the liquid in the main cylinder can be supplied into the vertical supply pipe through the inside of the communication section. Here, the first check valve blocks communication between the inside of the container body and the inside of the vertical supply pipe, and the second check valve allows communication between the ejection hole and the inside of the vertical supply pipe. Accordingly, the liquid supplied into the vertical supply pipe from the inside of the main cylinder can be supplied into the reservoir cylinder through the vertical supply pipe, and the inside of the reservoir cylinder can be pressurized. Accordingly, the reservoir plunger can be pushed toward one side in the axial direction against forward biasing, and the reservoir plunger can be moved toward one side in the axial direction according to supply of the liquid into the reservoir cylinder. 
     Accordingly, whenever an operation of pulling the trigger is performed, the reservoir plunger can be moved toward one side in the axial direction to store (fill) the liquid in the reservoir cylinder. 
     Further, since the trigger that has moved rearward is moved forward according to forward biasing, the main piston is accordingly moved back forward in the main cylinder. For this reason, decompression can occur in the main cylinder such that the pressure reaches a negative pressure lower than the pressure in the container body. Here, the first check valve allows communication between the inside of the container body and the inside of the vertical supply pipe, and the second check valve blocks communication between the ejection hole and the inside of the vertical supply pipe. Accordingly, the liquid in the container body can be suctioned into the vertical supply pipe, and introduced into the main cylinder through the communication section. Accordingly, when an operation of pulling the trigger rearward is repeatedly performed, the liquid in the main cylinder can be supplied into the reservoir cylinder while being pressurized, and as described above, the liquid can be stored in the reservoir cylinder while the reservoir plunger is moved to one side in the axial direction. 
     When an operation of the trigger is stopped after the inside of the reservoir cylinder is filled with the liquid, while supply of the liquid into the reservoir cylinder through the vertical supply pipe is stopped, the reservoir plunger starts to be moved back toward the other side in the axial direction. Accordingly, the liquid with which the inside of the reservoir cylinder is filled can be pushed toward the ejection hole through the ejection barrel from the inside of the reservoir cylinder, and can be injected from the ejection hole. Accordingly, continuous injection of the liquid can be performed. 
     Moreover, since outflow of the liquid from the inside of the reservoir cylinder toward the vertical supply pipe is restricted by the second check valve during continuous injection of the liquid, for example, the liquid can be injected to the outside from the ejection hole at a high pressure. Accordingly, an injection form of the liquid can be maintained from starting of injection to stopping of the injection, and the liquid can be easily injected in various injection types. 
     When the reservoir plunger is moved back toward the other side in the axial direction, the reservoir plunger is moved in the reservoir cylinder to the other end in the axial direction if the trigger is not pulled again, but an operation of pulling the trigger may be repeated before that. In this case, the reservoir plunger repeats movement to one side and movement to the other side in the axial direction with a substantially constant width, and gradually moves toward one side in the axial direction as a whole. Accordingly, even in this case, the liquid can be gradually stored in the reservoir cylinder. 
     In particular, when the main piston is moved rearward according to an operation of the trigger and disposed at a position deviated rearward from the frontmost position, for example at the rearmost position, the inside of the main cylinder can be in communication with the inside of the container body through the communication path. Accordingly, for example, even when air is contained in the liquid suctioned into the main cylinder from the inside of the container body through the vertical supply pipe, the air can be mainly discharged from the inside of the main cylinder according to rearward movement of the main piston, and the air can escape to the inside of the container body through the communication path. Accordingly, the inside of the main cylinder can be reliably decompressed to the extent that the air is discharged according to forward recovery movement of the main piston after that. 
     Accordingly, when the trigger is operated first from an unused state, some of the air in the main cylinder can be discharged into the container body through the communication path according to an operation of the trigger. Accordingly, the liquid suctioned from the inside of the container body can be stored in the main cylinder while efficiently discharging the air in the main cylinder, and preparation before use can be rapidly completed by performing priming a small number of times. 
     In addition, after completion of the above-mentioned preparation, the liquid can be efficiently suctioned into the main cylinder from the inside of the container body according to the operation of the trigger, the liquid can be efficiently supplied into the reservoir cylinder according to the operation of the trigger after that, and the inside of the reservoir cylinder can be rapidly pressurized. Accordingly, the inside of the reservoir cylinder can be efficiently filled with the liquid, continuous injection of the liquid can be reliably and rapidly performed while avoiding (minimizing) injection errors, and appropriate injection performance can be obtained. 
     As described above, since the inside of the main cylinder can be reliably decompressed, reduction in the number of times priming is performed, avoidance of injection errors, and so on can be achieved, and it is possible to provide a trigger type liquid ejector with high quality that can be easily used and has improved convenience. 
     The ejector main body may include an accumulator valve 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. 
     In this case, since the accumulator valve is provided, the pressurized liquid can be injected from the ejection hole. Accordingly, for example, the liquid can be prevented from being immediately injected from the ejection hole by the operation of the trigger, and the liquid can be injected at an appropriate pressure (injection pressure). Accordingly, for example, even in the case other than continuous injection, injection can be performed in an appropriate injection state by the operation of the trigger. In addition, for example, during storage or the like, since a flow of the low pressure liquid toward the ejection hole can be restricted by the accumulator valve, leakage of the liquid from the ejection hole can be minimized. 
     A piston guide with which the main piston closely slides may be formed in the main cylinder, and the communication path may be 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. 
     In this case, since movement of the main piston can be guided using the piston guide, the main piston can be easily and smoothly moved with little rattling. Accordingly, operability of the trigger can be improved, and injection of the liquid can be smoothly performed. In addition, since the communication path can be formed using the space between the main piston and the piston guide and the inside of the piston guide, the communication path can be easily and conveniently formed. 
     A lip section in close sliding contact with the outer circumferential surface of the piston guide may be formed on the main piston, a recessed section recessed toward an inner side of the piston guide and configured to accommodate the lip section may be 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 may be 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. 
     In this case, when the main piston is moved from the frontmost position to the rearmost position according to the operation of the trigger, the lip section is accommodated in the recessed section. Accordingly, the air in the main cylinder can be discharged through the gap between the lip section and the recessed section, and the air can escape to the inside of the container body through the communication path. In addition, since the lip section is accommodated in the recessed section when the main piston is disposed at the rearmost position, the air can be discharged from the inside of the main cylinder in a final stage while substantially the entire liquid in the main cylinder is supplied into the vertical supply pipe. Accordingly, both of appropriate supply of the liquid from the inside of the main cylinder into the vertical supply pipe and appropriate discharge of the air from the inside of the main cylinder can be more stably and reliably performed. 
     Advantageous Effects of Invention 
     According to the present invention, since the inside of the main cylinder can be reliably decompressed, reduction in the number of times priming is performed, avoidance of injection errors, and so on can be achieved, and it is possible to provide a trigger type liquid ejector with high quality that can be easily used and has improved convenience. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a longitudinal cross-sectional view showing an embodiment of a trigger type liquid ejector according to the present invention. 
         FIG. 2  is an enlarged longitudinal cross-sectional view of a periphery of a vertical supply pipe according to the trigger type liquid ejector shown in  FIG. 1 . 
         FIG. 3  is an enlarged longitudinal cross-sectional view of a periphery of a reservoir plunger according to the trigger type liquid ejector shown in  FIG. 1 . 
         FIG. 4  is a longitudinal cross-sectional view showing a state in which a trigger is pulled rearward from a state shown in  FIG. 3  to perform continuous spray. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, an embodiment of a trigger type liquid ejector according to the present invention will be described with reference to the accompanying drawings. 
     As shown in  FIG. 1 , a trigger type liquid ejector  1  of the embodiment includes an ejector main body  2  mounted on a container body A that accommodates a liquid and having a vertical supply pipe  10  configured to suction the liquid, and a nozzle member  3  having an ejection hole  4  configured to spray the liquid forward and mounted on the ejector main body  2 . 
     Further, each configuration of the trigger type liquid ejector  1  is a molded article formed of a synthetic resin unless the context clearly indicates otherwise. 
     In the embodiment, a central axis of the vertical supply pipe  10  is referred to as an axis O 1 , a side of the container body A along the axis O 1  is referred to as a lower side, an opposite side thereof is referred to as an upper side, and a direction along the axis O 1  is referred to as an upward/downward direction. In addition, in a plan view seen in the upward/downward direction, one direction perpendicular to the axis O 1  is referred to as a forward/rearward direction, and a direction perpendicular to both of the upward/downward direction and the forward/rearward direction is referred to as a leftward/rightward direction. 
     The ejector main body  2  includes the vertical supply pipe  10  extending in the upward/downward direction, and an ejection barrel  11  extending from the vertical supply pipe  10  in the forward/rearward direction and in communication with the vertical supply pipe  10 . Further, the ejector main body  2  includes a connecting tube section  30 , a closing-off plug  31 , a ball valve (a first check valve)  36 , a tube section  40  for a cylinder, a reservoir cylinder  90 , a reservoir valve (a second check valve)  102  and a reservoir plunger  110 . 
     Further, in the forward/rearward direction, a direction in which the ejection barrel  11  extends from the vertical supply pipe  10  is referred to as a front side or a forward direction, and an opposite direction thereof is referred to as a rear side or a rearward direction. 
     As shown in  FIGS. 1 and 2 , the vertical supply pipe  10  includes an outer tube  12  having a topped tubular shape, and an inner tube  13  fitted into the outer tube  12 . 
     The outer tube  12  includes a large diameter section  12   a , a small diameter section  12   b  disposed above the large diameter section  12   a  and having a diameter smaller than that of the large diameter section  12   a , and a flange section  12   c  configured to connect an upper end portion of the large diameter section  12   a  and a lower end portion of the small diameter section  12   b , and is formed in a two-stage tube shape having a diameter reduced from below toward above. Further, an upper opening section of the small diameter section  12   b  is covered with a top wall section  12   d.    
     A seal tube section  12   e  and a restricting protrusion  12   f  which extend downward are formed on the top wall section  12   d . Both of the seal tube section  12   e  and the restricting protrusion  12   f  are disposed coaxially with the axis O 1 . Further, the seal tube section  12   e  is formed to surround the restricting protrusion  12   f  from an outer side in the radial direction, and extends downward to substantially the same length as that of the restricting protrusion  12   f.    
     The inner tube  13  includes a large diameter section  13   a , a small diameter section  13   b  disposed above the large diameter section  13   a  and having a diameter smaller than that of the large diameter section  13   a , and a flange section  13   c  configured to connect an upper end portion of the large diameter section  13   a  and a lower end portion of the small diameter section  13   b , and formed in a two-stage tube shape having a diameter reduced from below toward above. 
     The seal tube section  12   e  of the outer tube  12  is fitted into an upper end portion of the small diameter section  13   b  of the inner tube  13 . In addition, an upper section of a pipe  15  disposed in the container body A and having a lower end opening located at a bottom section (not shown) of the container body A is fitted into the small diameter section  13   b . The flange section  13   c  of the inner tube  13  is disposed below the flange section  12   c  of the outer tube  12  in a state in which a gap S 1  is secured between the flange section  13   c  of the inner tube  13  and the flange section  12   c  of the outer tube  12 . 
     An annular brim section  13   d  protruding outward in the radial direction is formed on a portion of the large diameter section  13   a  of the inner tube  13  protruding downward from the large diameter section  12   a  of the outer tube  12 . The brim section  13   d  is disposed in an upper end portion of a mounting cap  14  mounted (for example, screwed) on a mouth section A 1  of the container body A, and rotatably locks an upper end portion of the mounting cap  14  around the axis thereof. 
     The brim section  13   d  is sandwiched between the mounting cap  14  and an upper end opening edge in the mouth section A 1  of the container body A in the upward/downward direction. 
     The axis O 1  of the vertical supply pipe  10  constituted by the outer tube  12  and the inner tube  13  is eccentric rearward with respect to a container axis of the container body A. 
     A support tube section  35  formed in a tubular shape having a diameter smaller than that of the inner tube  13  and configured to support the ball valve  36  from below is disposed on a portion of an inner circumferential surface of the inner tube  13  below the seal tube section  12   e  and above an upper end of the pipe  15 . 
     The support tube section  35  is disposed coaxially with the axis O 1 , and a lower end portion thereof protrudes outward in the radial direction to be formed integrally with an inner circumferential surface of the inner tube  13 . An upper opening end of the support tube section  35  becomes a seating surface on which the ball valve  36  seats, and is formed in a tapered cross-sectional shape. 
     The ball valve  36  is disposed inside the inner tube  13  in a state in which the ball valve  36  is separably seated on the seating surface of the support tube section  35 . The ball valve  36  brings a space in the inner tube  13  disposed above the support tube section  35  and a space in the inner tube  13  disposed below the support tube section  35  in communication with each other and blocks communication between these spaces. 
     The connecting tube section  30  extends forward from the upper end portion of the vertical supply pipe  10 . Specifically, a rear end portion of the connecting tube section  30  is connected to a front side of an upper end portion in the small diameter section  12   b  of the outer tube  12 . A rear end opening of the connecting tube section  30  is open in the seal tube section  12   e . Accordingly, the connecting tube section  30  is in communication with the vertical supply pipe  10 . 
     The closing-off plug  31  closely fitted into the connecting tube section  30  and configured to close a front end opening of the connecting tube section  30  is provided on a front end portion of the connecting tube section  30 . 
     The tube section  40  for a cylinder is formed integrally with a portion of the outer tube  12  disposed below the connecting tube section  30 . The tube section  40  for a cylinder is open forward while protruding forward from the outer tube  12 . The tube section  40  for a cylinder is disposed between the connecting tube section  30  and the flange section  12   c , has a common partition wall W 1  shared with the connecting tube section  30 , and has a common partition wall W 2  shared with the flange section  12   c.    
     As shown in  FIGS. 1 and 3 , the reservoir cylinder  90  is disposed above the connecting tube section  30 , and the liquid passing through the vertical supply pipe  10  and the connecting tube section  30  is supplied into the reservoir cylinder  90  according to rearward swinging (movement) of a trigger  51  (to be described below). 
     The reservoir cylinder  90  is formed in a tubular shape extending in the forward/rearward direction, and disposed parallel to the connecting tube section  30  and the tube section  40  for a cylinder. In the drawings, the reservoir cylinder  90  is formed to protrude rearward from the vertical supply pipe  10 . Further, a central axis of the reservoir cylinder  90  extends in the forward/rearward direction. Hereinafter, a central axis of the reservoir cylinder  90  is referred to as an axis O 2 . 
     A supply hole  91  in communication with the connecting tube section  30  is formed in the reservoir cylinder  90 . Accordingly, the liquid passing through the vertical supply pipe  10  and the connecting tube section  30  is supplied into the reservoir cylinder  90  through the supply hole  91 . 
     The connecting tube section  30  and the reservoir cylinder  90  are disposed parallel to each other in the upward/downward direction, and include a common partition wall W 3 . In the drawings, the reservoir cylinder  90  is disposed above the vertical supply pipe  10 . For this reason, the vertical supply pipe  10  and the reservoir cylinder  90  include a common partition wall W 4  formed by the top wall section  12   d.    
     The reservoir cylinder  90  includes a front wall section  92  disposed above a front end portion of the connecting tube section  30 , and a cylinder tube  93  extending rearward from the front wall section  92 , and is formed in a tubular shape that opens rearward as a whole. 
     A mounting concave section  94  and a communication hole  95  are formed in the front wall section  92 . 
     The mounting concave section  94  is formed on a rear end surface of the front wall section  92  in an annular shape coaxial with the axis O 2  of the reservoir cylinder  90 . The communication hole  95  is formed to pass through the front wall section  92  in the forward/rearward direction. The communication hole  95  is disposed inside the mounting concave section  94  and passes through the front wall section  92  in the forward/rearward direction when the front wall section  92  is seen in a front view in the forward/rearward direction. 
     The cylinder tube  93  includes a front tube section  96  connected to the front wall section  92 , a rear tube section  97  having an outer diameter and an inner diameter larger than those of the front tube section  96  and disposed behind the front tube section  96 , and a stepped section  98  configured to connect the front tube section  96  and the rear tube section  97  in the forward/rearward direction, and is formed in a multi-stage tubular shape having a diameter that is gradually increased from a front side toward a rear side. 
     The stepped section  98  has a diameter that is gradually increased from a front side toward a rear side. The rear tube section  97  is disposed behind the vertical supply pipe  10 . A plurality of locking concave sections  97   a  are formed on a rear end portion side of the rear tube section  97  at intervals in the circumferential direction of the rear tube section  97 . In the drawings, the locking concave sections  97   a  are formed to pass through the rear tube section  97  in the radial direction. 
     However, the locking concave section  97   a  may not be a through-hole, and for example, may be a concave section (a recessed section) formed in an inner circumferential surface of the rear tube section  97 . 
     Further, the front tube section  96  constitutes the partition wall W 3 . Then, a rear end portion of the front tube section  96 , the stepped section  98 , and a front end portion of the rear tube section  97  constitute the partition wall W 4 . 
     In addition to the supply hole  91 , a communicating groove  140  and a collecting hole  141  are further formed in the cylinder tube  93 . 
     The supply hole  91  is formed in a lower portion of a front end portion in the front tube section  96 , and passes through the partition wall W 3  in the upward/downward direction. The communicating groove  140  is formed in an inner circumferential surface of a rear end portion in the front tube section  96 . The communicating groove  140  is open rearward while extending in the forward/rearward direction. In the drawings, the plurality of communicating grooves  140  are formed around the axis O 2  at intervals. 
     The collecting hole  141  is formed in the stepped section  98  and passes through the partition wall W 4  in the upward/downward direction. Specifically, the collecting hole  141  is formed to be disposed between the seal tube section  12   e  and the small diameter section  12   b  of the outer tube  12  when seen in a direction of the axis O 1 . 
     As shown in  FIGS. 2 and 3 , a collecting passage  142  in communication with the collecting hole  141  and crossing the vertical supply pipe  10  in the upward/downward direction is formed in the vertical supply pipe  10 . The collecting passage  142  is formed in a longitudinal groove shape in the outer circumferential surface of the inner tube  13 , and passes through the small diameter section  13   b  in the upward/downward direction to come in communication with the large diameter section  13   a . Accordingly, the collecting passage  142  comes in communication with the collecting hole  141  and the container body A. 
     As shown in  FIGS. 1 and 3 , a valve body  100  in which the reservoir valve  102  is formed is disposed in the reservoir cylinder  90 . 
     The reservoir valve  102  is a check valve configured to allow supply of a liquid into the reservoir cylinder  90  from the connecting tube section  30  through the supply hole  91  and restrict outflow of the liquid from the reservoir cylinder  90  through the supply hole  91  into the connecting tube section  30 . That is, the reservoir valve  102  is a check valve configured to allow communication between the ejection hole  4  and the vertical supply pipe  10  during pressurization in a main cylinder  53  (to be described below) and block communication between the ejection hole  4  and the vertical supply pipe  10  during decompression in the main cylinder  53 . 
     The valve body  100  includes a valve base section  101  and the reservoir valve  102 . 
     The valve base section  101  is formed in an annular shape coaxial with the axis O 2  and disposed on a rear end surface side of the front wall section  92 . The valve base section  101  includes a mounting convex section  103  protruding forward and mounted in the mounting concave section  94  by entering the mounting concave section  94  from behind. Accordingly, the entire valve body  100  is assembled integrally with the front wall section  92 . 
     The reservoir valve  102  is formed in an annular shape protruding rearward from an outer circumferential edge portion of the valve base section  101 . The reservoir valve  102  is elastically deformable in the radial direction of the reservoir cylinder  90 , and a rear end portion of the reservoir valve  102  that is a free end separably seats on the inner circumferential surface of the cylinder tube  93 . The rear end portion of the reservoir valve  102  is disposed behind the supply hole  91 . Accordingly, the reservoir valve  102  openably closes the supply hole  91  from the inside of the reservoir cylinder  90 . 
     The reservoir plunger  110  is accommodated in the reservoir cylinder  90 , and the reservoir plunger  110  is disposed to be movably in the forward/rearward direction (the axial direction) along the axis O 2  and moves rearward (one side in the axial direction) according to supply of the liquid into the reservoir cylinder  90 . 
     The reservoir plunger  110  includes a sliding member  120  sliding in the reservoir cylinder  90  in the forward/rearward direction, and a receiving member  130  fitted into the sliding member  120 . The sliding member  120  and the receiving member  130  are formed in a tubular shape extending in the forward/rearward direction, and disposed coaxially with the axis O 2 . 
     For example, the sliding member  120  includes a plunger tube  121  formed of a material softer than the receiving member  130  and extending in the forward/rearward direction, and a closing wall  122  configured to close a front end opening of the plunger tube  121 . 
     The plunger tube  121  is formed in a multi-stage tubular shape having a diameter that is gradually increased from a front side toward a rear side. A first lip section  123  and a second lip section  124  are formed on the outer circumferential surface of the plunger tube  121  throughout the circumference of the plunger tube  121  in the circumferential direction. 
     The first lip section  123  and the second lip section  124  are disposed at an interval in the forward/rearward direction, and closely slide on the inner circumferential surface of the cylinder tube  93  in the forward/rearward direction. 
     Specifically, the first lip section  123  slides on the inner circumferential surface of the front tube section  96 , and the second lip section  124  slides on the inner circumferential surface of the rear tube section  97 . Further, the first lip section  123  is in close sliding contact with the inner circumferential surface of the front tube section  96 . Accordingly, sealability is secured between the first lip section  123  and the inner circumferential surface of the front tube section  96 . Similarly, the second lip section  124  is in close sliding contact with the inner circumferential surface of the rear tube section  97 . Accordingly, sealability is secured between the second lip section  124  and the inner circumferential surface of the rear tube section  97 . 
     A front end surface of the closing wall  122  separably seats on the rear end surface of the valve base section  101  from behind. Accordingly, the closing wall  122  openably closes the communication hole  95 . 
     In particular, the closing wall  122  is biased forward by an elastic recovering force (a spring force) of a coil spring  160  (to be described below), and strongly pressed on the rear end surface of the valve base section  101  from behind. 
     Accordingly, the closing wall  122  seals the communication hole  95 , and is opened to open the communication hole  95  when the entire reservoir plunger  110  is moved rearward against the coil spring  160 . Accordingly, the closing wall  122  functions as an accumulator valve that can pressure the liquid in the reservoir cylinder  90  until the reservoir plunger  110  is moved rearward, and open a valve to supply the pressurized liquid toward the ejection hole  4  when a pressure of the liquid reaches a predetermined value, i.e., when the reservoir plunger  110  is moved rearward against the coil spring  160 . 
     The closing wall  122  of the embodiment is disposed closer to the ejection hole  4  than the reservoir valve  102 , and opens the valve with a working pressure (a valve opening pressure) corresponding to an elastic recovering force (a spring force) of the coil spring  160 . A working pressure of the closing wall  122  is higher than a working pressure when the reservoir valve  102  is open. 
     A convex section  125  and a concave groove  126  are formed in the front end surface of the closing wall  122 . The convex section  125  protrudes forward from the closing wall  122 , and enters the annular valve base section  101  from behind. The concave groove  126  extends in the radial direction of the reservoir plunger  110 , and is open outward in the radial direction. 
     When the front end surface of the closing wall  122  seats on (abuts) the rear end surface of the valve base section  101 , communication between the concave groove  126  and the communication hole  95  is blocked. 
     The receiving member  130  includes a receiving tube  131  disposed inside the plunger tube  121  and having a topped tubular shape, a front end opening of which is closed, and an annular receiving seat section  132  protruding from a portion of the receiving tube  131  behind the plunger tube  121  outward in the radial direction of the receiving tube  131  and coining in contact with a rear end portion of the plunger tube  121  from behind. 
     The receiving tube  131  extends rearward from a rear end portion of the plunger tube  121 . Accordingly, an annular gap is formed between the receiving tube  131  and the rear tube section  97  of the cylinder tube  93 . 
     The coil spring  160  (to be described below) is attached using the annular gap. 
     A cap  150  is mounted on a rear end portion of the reservoir cylinder  90 . 
     The cap  150  includes a cap tube  151  disposed coaxially with the axis O 2  and fitted into the rear tube section  97  of the cylinder tube  93 , and a cap wall  152  configured to cover a rear opening section of the cap tube  151 . 
     A plurality of locking protrusion sections  151   a  protruding outward in the radial direction of the cap tube  151  are formed on the outer circumferential surface of the cap tube  151  at intervals in the circumferential direction of the cap tube  151 . The locking protrusion sections  151   a  enter the locking concave sections  97   a  formed in the rear tube section  97 , and are locked to the locking concave sections  97   a  from the front. Accordingly, the cap  150  is assembled to the reservoir cylinder  90  while being retained to the rear. 
     An air hole  152   a  configured to bring the inside and the outside of the reservoir cylinder  90  in communication with each other is formed in the central section of the cap wall  152 . 
     The coil spring  160  formed of, for example, a metal material is disposed between the reservoir plunger  110  and the cap  150  in a compressed state. 
     The coil spring  160  is disposed to surround a rear end portion of the plunger tube  121  in the receiving member  130 , a front end portion thereof abuts the receiving seat section  132  from the rear, and a rear end portion thereof abuts the cap wall  152  from the front. Accordingly, in the reservoir cylinder  90 , the coil spring  160  biases the reservoir plunger  110  forward using an elastic recovering force thereof. Accordingly, the closing wall  122  closes the communication hole  95  in a state in which the communication hole  95  is sealed by biasing from the coil spring  160  as described above. 
     Note that a position of the reservoir plunger  110  when the closing wall  122  closes the communication hole  95  is the most advanced position. Accordingly, when the reservoir plunger  110  is disposed at the most advanced position, the reservoir cylinder  90  accommodates almost no liquid, and the communication hole  95  is blocked. 
     On the other hand, as shown in  FIG. 4 , the position of the reservoir plunger  110  when the rear end portion of the receiving tube  131  abuts or approaches the cap wall  152  according to rearward movement of the reservoir plunger  110  is the most retracted position. Accordingly, when the reservoir plunger  110  is disposed at the most retracted position, the liquid is maximally accommodated in the reservoir cylinder  90 . 
     As shown in  FIGS. 1 and 3 , the ejection barrel  11  extends forward from the front wall section  92  of the reservoir cylinder  90 , and the liquid in the vertical supply pipe  10  is guided to the ejection hole  4 . The ejection barrel  11  is disposed such that a central axis thereof is located below the axis O 2  of the reservoir cylinder  90 . The inside of the ejection barrel  11  comes in communication with the inside of the vertical supply pipe  10  through the communication hole  95 , the inside of the reservoir cylinder  90 , the supply hole  91  and the inside of the connecting tube section  30 . 
     As shown in  FIGS. 1 to 3 , the ejector main body  2  further includes the trigger  51  extending downward from the ejection barrel  11  and disposed in front of the vertical supply pipe  10  to be swingable (movable) rearward while being biased forward, a main piston  52  linked to swinging of the trigger  51  and moved in the forward/rearward direction, the main cylinder  53  having the inside that is pressurized and decompressed according to movement of the main piston  52 , an elastic plate section  54  configured to bias the trigger  51  forward, and a cover body  55  configured to cover all of the vertical supply pipe  10 , the ejection barrel  11  and the reservoir cylinder  90  in at least the upward direction and the leftward/rightward direction. 
     The trigger  51 , the main piston  52 , the main cylinder  53  and the elastic plate section  54  constitute a trigger mechanism  50  configured to cause the liquid to flow from the inside of the vertical supply pipe  10  toward the ejection hole  4  through the inside of the ejection barrel  11  according to rearward swinging of the trigger  51 . 
     The main cylinder  53  includes an outer tube section  60  that opens forward, a rear wall section  61  configured to close a rear opening section of the outer tube section  60 , and a piston guide  62  protruding forward from a central portion of the rear wall section  61  and having a topped tubular shape, a front end of which is closed. The inside of the main cylinder  53  is in communication with the inside of the vertical supply pipe  10  through a communicating tube (a communication section)  63 . Further, the closing-off plug  31  is formed integrally with the main cylinder  53 . 
     The outer tube section  60  is fitted into the tube section  40  for a cylinder. The inner circumferential surface of the tube section  40  for a cylinder and the outer circumferential surface of the outer tube section  60  come in close contact with each other at both ends in the forward/rearward direction. Meanwhile, an annular gap S 2  is secured in an intermediate section, which is disposed between both ends in the forward/rearward direction, between the inner circumferential surface of the tube section  40  for a cylinder and the outer circumferential surface of the outer tube section  60 . 
     A first ventilation hole  64  configured to bring the inside of the outer tube section  60  and the gap S 2  in communication with each other is formed in the outer tube section  60 . A second ventilation hole  65  configured to bring the gap S 2  and the gap S 1  defined between the flange section  12   c  of the outer tube  12  and the flange section  13   c  of the inner tube  13  in communication with each other is formed in the flange section  12   c  of the outer tube  12 . 
     Further, a third ventilation hole  66  configured to bring the gap S 1 , the inside of the large diameter section  13   a  of the inner tube  13  and the inside of the mounting cap  14  in communication with each other is formed in the flange section  13   c  of the inner tube  13 . 
     The communicating tube  63  protrudes rearward from the main cylinder  53 . Specifically, the communicating tube  63  is formed on a portion of the rear wall section  61  of the main cylinder  53  disposed above the piston guide  62 , and integrally passes through the outer tube  12  and the inner tube  13 . Here, the communicating tube  63  is closely fitted into a first through-hole  67  formed in the outer tube  12 , and closely fitted into a second through-hole  68  formed in the inner tube  13  through the first through-hole  67 . Accordingly, the inside of the vertical supply pipe  10  and the inside of the main cylinder  53  come in communication with each other through the communicating tube  63 . 
     The communicating tube  63  is formed to come in communication with a space of the inner tube  13  disposed between the seal tube section  12   e  and the ball valve  36 . Accordingly, the inside of the main cylinder  53  comes in communication with the space of the inner tube  13  disposed between the seal tube section  12   e  and the ball valve  36  through the communicating tube  63 . Accordingly, the ball valve  36  can be switched to bring the inside of the container body A and the inside of the main cylinder  53  in communication with each other and block the communication. 
     The ball valve  36  is a check valve that is closed to block communication between the inside of the container body A and the inside of the vertical supply pipe  10  during pressurization in the main cylinder  53 , and that is opened to allow communication between the inside of the container body A and the inside of the vertical supply pipe  10  according to upward displacement during decompression in the main cylinder  53 . Accordingly, during closing of the ball valve  36 , communication between the inside of the container body A and the inside of the main cylinder  53  through the vertical supply pipe  10  is blocked, and during opening of the ball valve  36 , communication between the inside of the container body A and the inside of the main cylinder  53  through the vertical supply pipe  10  is allowed. 
     In the drawings, the communicating tube  63  protrudes in the inner tube  13 . Accordingly, a portion of the communicating tube  63  disposed in the inner tube  13  is locked to the ball valve  36  when the ball valve  36  is open, and further upward displacement of the ball valve  36  can be restricted. 
     However, the communicating tube  63  may not protrude in the inner tube  13 . In this case, for example, further upward displacement of the ball valve  36  can be restricted using the restricting protrusion  12   f.    
     The inside of the piston guide  62  is open rearward. A fitting tube section  41  protruding forward from the rear wall in the tube section  40  for a cylinder (the small diameter section  12   b  of the outer tube  12 ) is fitted into the piston guide  62  from behind. 
     The main piston  52  includes a columnar connecting section  70  connected to the trigger  51 , and a piston tube  71  disposed behind the connecting section  70  and having a diameter larger than that of the connecting section  70 , and is formed in a tubular shape that opens rearward as a whole. 
     Further, the main cylinder  53  and the main piston  52  are disposed in a common axis (not shown) extending in the forward/rearward direction. 
     The piston tube  71  includes a piston main body section  72  that opens rearward and into which the piston guide  62  is inserted, and a sliding tube section  73  protruding from a rear end portion of the piston main body section  72  outward in the radial direction and, for example, in sliding contact with the inner circumferential surface of the outer tube section  60 . 
     The piston main body section  72  has an inner diameter that is slightly larger than an outer diameter of the piston guide  62 . The inner circumferential surface of the piston main body section  72  and the outer circumferential surface of the piston guide  62  face each other with a slight gap in the radial direction of the piston tube  71 . 
     An annular inner lip section (a lip section)  72   a  protruding from the piston main body section  72  inward in the radial direction and in close sliding contact with the outer circumferential surface of the piston guide  62  is formed on a rear end portion of the piston main body section  72 . Accordingly, sealability is secured between the inner lip section  72   a  and the outer circumferential surface of the piston guide  62 . 
     The sliding tube section  73  includes an outer lip section  73   a  formed in a tapered shape having a diameter that is gradually increased forward and rearward from a central section in the forward/rearward direction and disposed at both end portions in the forward/rearward direction. The outer lip section  73   a  comes in close sliding contact with the inner circumferential surface of the outer tube section  60 . Accordingly, sealability is secured between an outer lip section  74   a  and the inner circumferential surface of the outer tube section  60 . 
     The connecting section  70  of the main piston  52  is connected to the trigger  51  via connecting shafts  86  (to be described below). Accordingly, the main piston  52  is biased forward by a biasing force of the elastic plate section  54  together with the trigger  51 , and moved rearward and pushed into the main cylinder  53  according to rearward swinging of the trigger  51 . 
     When the trigger  51  is disposed at the frontmost swinging position (the frontmost moving position), the main piston  52  is disposed at a frontmost position corresponding thereto, and the sliding tube section  73  closes the first ventilation hole  64 . When the main piston  52  is moved rearward by a predetermined extent from the frontmost position according to rearward swinging of the trigger  51 , the sliding tube section  73  opens the first ventilation hole  64 . Accordingly, the inside of the container body A comes in communication with the outside through the third ventilation hole  66 , the second ventilation hole  65  and the first ventilation hole  64 . 
     As shown in  FIG. 2 , the trigger  51  includes a main plate member  80  having a front surface curved in a concave shape recessed rearward when seen in a side view in the leftward/rightward direction, and a pair of side plate members  81  standing up rearward from left and right side edge portions of the main plate member  80 . 
     A pair of connecting plates  82  extending upward to reach a side of the ejection barrel  11  and sandwiching the ejection barrel  11  therebetween in the leftward/rightward direction are formed on upper end portions of the pair of side plate members  81 . Rotary shaft sections  83  protruding outward in the leftward/rightward direction are provided on the pair of connecting plates  82 . The rotary shaft sections  83  pivotably support a bearing section provided in an upper plate member  84  (see  FIG. 3 ) configured to cover the ejection barrel  11  from above. Accordingly, the trigger  51  is swingable about the rotary shaft sections  83  in the forward/rearward direction. 
     In the trigger  51 , an opening section Ma passing through the main plate member  80  in the forward/rearward direction is formed, and a connecting tube  85  extending rearward from a circumferential edge portion of the opening section  51   a  is formed. 
     The pair of connecting shafts  86  protruding toward an inner side of the connecting tube  85  in the leftward/rightward direction are formed on a rear portion of the inner circumferential surface of the connecting tube  85 . The connecting shafts  86  are inserted into a connecting hole formed in the connecting section  70  of the main piston  52 . Accordingly, the trigger  51  and the main piston  52  are connected to each other. 
     The connecting portion  70  of the main piston  52  is connected to the connecting shafts  86  to be pivotable about the axis and movable in the upward/downward direction by a predetermined amount. Accordingly, the main piston  52  is movable forward and rearward in conjunction with swinging of the trigger  51  in the forward/rearward direction. 
     The elastic plate sections  54  formed in an arc shape protruding forward when seen in a side view in the leftward/rightward direction and extending below the ejection barrel  11  are formed integrally with left and right sides of the upper plate member  84 . The elastic plate section  54  includes a pair of leaf springs formed in arc shapes concentric with each other and arranged forward and rearward when seen in a side view in the leftward/rightward direction. 
     In the pair of leaf springs, a leaf spring disposed on a front side is referred to as a main leaf spring  54   a , and a leaf spring disposed on a rear side is referred to as a subsidiary leaf spring  54   b.    
     Lower end portions of the main leaf spring  54   a  and the subsidiary leaf spring  54   b  are connected integrally with each other via a folded section  54   c  having an arc shape. A locking piece  54   d  protruding downward is formed on the folded section  54   c , and the locking piece  54   d  is inserted into and engaged with a pocket section  81   a  formed in the side plate member  81  in the trigger  51  from above. 
     Accordingly, the elastic plate sections  54  bias the trigger  51  forward via the locking pieces  54   d  and the pocket sections  81   a.    
     An upper end portion of the main plate member  80  of the trigger  51  abuts a lower end portion of a restricting wall  172  (to be described below) from behind due to biasing by the elastic plate section  54 . Accordingly, the trigger  51  is positioned at the frontmost swinging position. 
     Further, when the trigger  51  is pulled rearward from the frontmost swinging position, the elastic plate section  54  is elastically deformed to move the folded section  54   c  rearward via the locking piece  54   d . Here, in the elastic plate section  54 , the subsidiary leaf spring  54   b  is more largely elastically deformed than the main leaf spring  54   a.    
     Even when the trigger  51  is pulled rearward, the locking piece  54   d  maintains a state in which the trigger  51  is engaged with the pocket section  81   a  until arrival at the rearmost swinging position (the rearmost moving position) while being extracted upward from the pocket section  81   a.    
     As shown in  FIGS. 1 and 3 , the nozzle member  3  includes a nozzle plate  170 , a mounting tube  171 , the restricting wall  172 , an insertion section  173 , a nozzle shaft section  174  and an enclosure tube  175 , and is disposed in front of the ejector main body  2 . 
     The nozzle plate  170  is disposed to cover a front end opening section of the ejection barrel  11  from the front. 
     The mounting tube  171  protrudes rearward from the nozzle plate  170 , and is closely fitted onto the ejection barrel  11 . 
     A connecting hole  176  is formed in the nozzle plate  170 . The connecting hole  176  is disposed inside the mounting tube  171  when the nozzle plate  170  is seen in a plan view in the forward/rearward direction. When the lower end portion of the restricting wall  172  abuts the upper end portion of the main plate member  80  of the trigger  51  from the front, the trigger  51  is positioned at the frontmost swinging position. 
     The insertion section  173  protrudes rearward from the nozzle plate  170 , and is inserted into the ejection barrel  11  from the front throughout substantially the entire length of the insertion section  173  the forward/rearward direction. Here, the insertion section  173  is inserted into the ejection barrel  11  to secure a slight gap S 3  in an upper portion in an internal space of the ejection barrel  11 . Accordingly, the spatial volume in the ejection barrel  11  can be reduced. 
     Further, the gap S 3  is in communication with the connecting hole  176 . 
     The nozzle shaft section  174  is disposed such that the central axis thereof is disposed slightly above the axis O 2  of the reservoir cylinder  90 . The enclosure tube  175  protrudes slightly forward from the nozzle shaft section  174 . An annular flow passage  177  in communication with the connecting hole  176  is formed between the nozzle shaft section  174  and the enclosure tube  175 . 
     A nozzle cap  178  in which the ejection hole  4  that opens forward is formed is mounted on the nozzle shaft section  174 , and the flow passage  177  and the ejection hole  4  are in communication with each other. Accordingly, the inside of the reservoir cylinder  90  is in communication with the ejection hole  4  through the communication hole  95 , the inside of the ejection barrel  11 , the connecting hole  176  and the flow passage  177 . That is, the communication hole  95  brings the inside of the reservoir cylinder  90  and the ejection hole  4  in communication with each other. 
     In the trigger type liquid ejector  1  configured as described above in detail, as shown in  FIG. 2 , when the main piston  52  is moved to a position deviated rearward from the frontmost position, a communication path  180  configured to bring the inside of the main cylinder  53  in communication with the inside of the container body A through a route different from a route via the inside of the communicating tube  63  is formed between the main piston  52  and the main cylinder  53 . 
     The communication path  180  will be described in detail. 
     An annular recessed section  181  is formed on an outer circumferential surface in the rear end portion of the piston guide  62 . Accordingly, when the main piston  52  is moved rearward from the frontmost position, the inner lip section  72   a  formed on the piston main body section  72  reaches the recessed section  181 , and can be accommodated in the recessed section  181 . 
     The recessed section  181  is not limited to the case in which it is formed in an annular shape as long as the recessed section  181  is recessed toward an inner side of the piston guide  62 . For example, the recessed section  181  may be formed at one place on the outer circumferential surface of the piston guide  62 , or may be formed at a plurality of places at intervals in the circumferential direction of the piston guide  62 . 
     Further, in the embodiment, as shown in  FIG. 4 , the recessed section  181  is formed at a position corresponding to the inner lip section  72   a  in the radial direction of the piston guide  62  when the main piston  52  is moved to the rearmost position. Accordingly, when the main piston  52  is moved to the rearmost position, the inner lip section  72   a  is accommodated in the recessed section  181 . 
     When the inner lip section  72   a  is accommodated in the recessed section  181 , a slight gap is formed between the inner lip section  72   a  and the recessed section  181 . Accordingly, the inside of the main cylinder  53  and the gap between the inner circumferential surface of the piston main body section  72  and the outer circumferential surface of the piston guide  62  can be in communication with each other through the gap between the inner lip section  72   a  and the recessed section  181 . 
     A plurality of ribs  182  protruding forward and extending in the radial direction of the piston guide  62  are formed on the rear wall section  61  of the main piston  52  at intervals in the circumferential direction of the piston guide  62 . The inner lip section  72   a  comes in contact with the plurality of ribs  182  from the front when the main piston  52  is moved to the rearmost position. Accordingly, the inside of the main cylinder  53  can easily come in communication with the gap between the inner lip section  72   a  and the recessed section  181  through the gap between the ribs  182  neighboring in the circumferential direction. 
     However, the ribs  182  are not essential components and may not be provided. 
     As shown in  FIG. 2 , a communicating opening section  183  passing through the front end wall of the piston guide  62  in the forward/rearward direction and bringing the inside of the piston main body section  72  and the inside of the piston guide  62  in communication with each other is formed in the front end wall of the piston guide  62 . 
     In the drawings, the plurality of communicating opening sections  183  are formed at intervals in the circumferential direction of the piston guide  62 . The communicating opening sections  183  come in communication with the gap between the inner circumferential surface of the piston main body section  72  and the outer circumferential surface of the piston guide  62 , and come in communication with the inside of the fitting tube section  41  through the inside of the piston guide  62 . 
     The communicating opening section  183  is not limited to the case in which the plurality of communicating opening sections  183  are formed, and for example, one communicating opening section  183  having a size of the same diameter as the inner diameter of the piston guide  62  may be formed. 
     A connecting passage  184  configured to bring the inside of the fitting tube section  41  in communication with the inside of the third ventilation hole  66  is formed in a front portion of a space between the inner circumferential surface of the small diameter section  12   b  of the outer tube  12  and the outer circumferential surface of the small diameter section  13   b  of the inner tube  13  in the vertical supply pipe  10 . 
     Accordingly, the inside of the main cylinder  53  and the inside of the container body A can come in communication with a route, which is different from the route via the inside of the communicating tube  63 , through a space between the inner lip section  72   a  and the recessed section  181 , a gap between the inner circumferential surface of the piston main body section  72  and the outer circumferential surface of the piston guide  62 , the inside of the communicating opening section  183 , the inside of the piston guide  62  and the inside of the connecting passage  184 . 
     Accordingly, the space between the inner lip section  72   a  and the recessed section  181 , the gap between the inner circumferential surface of the piston main body section  72  and the outer circumferential surface of the piston guide  62 , the inside of the communicating opening section  183 , the inside of the piston guide  62  and the inside of the connecting passage  184  functions as the communication path  180 . 
     (Action of Trigger Type Liquid Ejector) 
     Next, the case in which the trigger type liquid ejector  1  configured as described above will be described. 
     Note that the respective parts of the trigger type liquid ejector  1  are filled with a liquid by a plurality of times of operations of the trigger  51 , and the liquid can be suctioned from the vertical supply pipe  10 . 
     In a state shown in  FIG. 1 , when the trigger  51  is pulled rearward against a biasing force of the elastic plate section  54 , as shown in  FIG. 4 , the main piston  52  is moved rearward from the frontmost position according to rearward movement of the trigger  51 , and therefore the inside of the main cylinder  53  can be pressurized. Accordingly, the liquid in the main cylinder  53  can be supplied to the inner tube  13  of the vertical supply pipe  10  through the communicating tube  63 . Then, the liquid supplied to the inner tube  13  pushes down the ball valve  36  to close the ball valve  36 , is supplied to the supply hole  91  through the connecting tube section  30 , and pushed up the reservoir valve  102  to open the reservoir valve  102 . 
     Accordingly, the liquid can be supplied into the reservoir cylinder  90 , and the inside of the reservoir cylinder  90  can be pressurized. Accordingly, the pressure of the liquid supplied into the reservoir cylinder  90  can be increased, and the reservoir plunger  110  can be moved rearward from the most advanced position against biasing of the coil spring  160 . In the early stage when the liquid starts to be introduced into the reservoir cylinder  90 , the liquid enters the concave groove  126 . For this reason, the reservoir plunger  110  is easily moved rearward. 
     When the reservoir plunger  110  is moved rearward, the front end surface of the closing wall  122  is separated from the rear end surface of the valve base section  101  to open the valve, and the communication hole  95  can be open. Accordingly, the liquid having an increased pressure can be introduced into the ejection hole  4  through the communication hole  95 , the inside of the ejection barrel  11 , the connecting hole  176  and the flow passage  177 , and the liquid can be injected forward from the ejection hole  4 . 
     In addition, at the same time, as described above, the reservoir plunger  110  can be moved rearward. 
     In this way, whenever an operation of pulling the trigger  51  rearward is performed, the liquid can be injected from the ejection hole  4 , and the reservoir plunger  110  can be moved rearward to store (fill) the liquid in the reservoir cylinder  90 . 
     When the reservoir plunger  110  is moved rearward, since the coil spring  160  is elastically compressed and deformed, a biasing force (a thrust force) that is directed forward can be applied to the reservoir plunger  110 . 
     After that, when the operation of pulling the trigger  51  is stopped and the trigger  51  is released, since the trigger  51  is biased forward to return to its original position by the elastic recovering force of the elastic plate section  54 , the main piston  52  is moved back forward through the main cylinder  53  in conjunction with the movement of the trigger  51 . For this reason, since the pressure in the main cylinder  53  can be decompressed to become a negative pressure lower than the pressure in the container body A, the liquid in the container body A can be suctioned into the vertical supply pipe  10 . 
     Then, the newly suctioned liquid pushes up the ball valve  36  to open the valve, and is introduced into the main cylinder  53  through the inside of the communicating tube  63 . Accordingly, the liquid can be provided upon the next injection. 
     Here, the reservoir valve  102  is closed, and an upward moving distance of the ball valve  36  is restricted by a part of the communicating tube  63  protruding in the inner tube  13 . 
     Then, when an operation of the trigger  51  is stopped after filling the inside of the main cylinder  53  with the liquid by repeating the operation of pulling the trigger  51  rearward, supply of the liquid into the reservoir cylinder  90  through the inside of the vertical supply pipe  10  and the inside of the connecting tube section  30  is stopped, and the reservoir plunger  110  starts to move forward toward the most advanced position (move back toward the other side in the axial direction) due to an elastic recovering force of the coil spring  160 . Here, outflow of the liquid into the connecting tube section  30  from the inside of the reservoir cylinder  90  is restricted by the reservoir valve  102 . 
     Accordingly, the liquid remained in the reservoir cylinder  90  can be introduced into the ejection hole  4  through the communication hole  95 , the inside of the ejection barrel  11 , the connecting hole  176  and the flow passage  177 , and the liquid can be continuously injected forward through the ejection hole  4 . 
     In this way, the liquid can be injected not only when the operation of pulling the trigger  51  rearward is performed but also when the trigger  51  is not operated, and continuous injection of the liquid can be performed. 
     In particular, according to the trigger type liquid ejector  1  of the embodiment, when the main piston  52  is moved rearward inside the main cylinder  53  to be disposed at the rearmost position according to the operation of the trigger  51 , as shown in  FIG. 4 , the inner lip section  72   a  of the main piston  52  reaches the recessed section  181  of the piston guide  62  and is accommodated in the recessed section  181 . Accordingly, the inside of the main cylinder  53  and the inside of the container body A can be in communication with each other through the communication path  180 . 
     Accordingly, even when air is contained in the liquid suctioned into the main cylinder  53  from the inside of the container body A through the inside of the vertical supply pipe  10  and the inside of the communicating tube  63 , the air can be mainly discharged from the inside of the main cylinder  53  according to rearward movement of the main piston  52 , and the air can escape to the inside of the container body A through the communication path  180 . 
     For this reason, the inside of the main cylinder  53  can be reliably decompressed to the extent that the air is discharged according to forward recovery movement of the main piston  52  after that. Accordingly, the liquid from the container body A can be efficiently suctioned into the main cylinder  53 , the liquid can be efficiently supplied into the reservoir cylinder  90  according to the operation of the trigger  51  after that, and the inside of the reservoir cylinder  90  can be rapidly pressurized. 
     Accordingly, when the trigger  51  is operated first from an unused state, some of the air in the main cylinder  53  can be discharged into the container body A through the communication path  180  according to the operation of the trigger  51 . Accordingly, the liquid suctioned from the inside of the container body A can be stored in the main cylinder  53  while efficiently discharging the air in the main cylinder  53 , and preparation before use can be rapidly completed by performing priming a small number of times. 
     In addition, after completion of the above-mentioned preparation, since the inside of the reservoir cylinder  90  can be efficiently filled with the liquid by the operation of the trigger  51 , continuous injection of the liquid can be securely and rapidly performed while avoiding (minimizing) injector errors, and appropriate injection performance can be obtained. 
     Since the inside of the main cylinder  53  can be securely decompressed as described above, reduction in number of priming times, avoidance of injection errors, and so on, can be achieved, and the trigger type liquid ejector  1  with high quality that can be easily used and having improved convenience can be obtained. 
     In particular, when the main piston  52  is moved from the frontmost position to the rearmost position, since the inner lip section  72   a  is accommodated in the recessed section  181 , the air can be discharged from the inside of the main cylinder  53  in the final stage while substantially the entire liquid in the main cylinder  53  is supplied into the vertical supply pipe  10 . Accordingly, both of appropriate supply of the liquid into the vertical supply pipe  10  from the inside of the main cylinder  53  and appropriate discharge of the air from the inside of the main cylinder  53  can be more stably and reliably performed. Accordingly, avoidance of injector errors, reduction in number of priming times, and so on, can be more efficiently exhibited. 
     Further, during continuous injection of the liquid, the pressure in the reservoir cylinder  90  may be efficiently increased, and the reservoir plunger  110  may be rapidly moved rearward. For this reason, for example, the pressure in the main cylinder  53 , the pressure in a portion in the vertical supply pipe  10  disposed above the ball valve  36 , and the pressure in the connecting tube section  30  may be efficiently increased by the operation of the trigger  51 , and the liquid having the increased pressure may be efficiently supplied into the reservoir cylinder  90 . 
     Accordingly, for example, a tapered pipe may be used as the pipe  15  configured to suction the liquid from the inside of the container body A. In this case, the liquid is suctioned while efficiently increasing the pressure in the main cylinder  53 , the pressure in the portion in the vertical supply pipe  10  disposed above the ball valve  36 , and the pressure in the connecting tube section  30 , which leads to rapid continuous injection. 
     Here, it may be considered a case in which decompression in the main cylinder  53  is insufficient or decompression is not performed during use. The cause may be, for example, a case in which bubbles occur in the main cylinder  53 , a case in which a forward biasing force of the reservoir plunger  110  is strong, or the like. 
     However, according to the embodiment, for example, even when bubbles occur in the main cylinder  53  during use, the bubbles can be discharged from the inside of the main cylinder  53  into the container body A through the communication path  180  by disposing the main piston  52  at the rearmost position. Accordingly, when the inside of the main cylinder  53  is decompressed according to forward recovery movement of the main piston  52  after that, the liquid can be suctioned into the main cylinder  53  from the inside of the container body A to an extent of a volume occupied by the discharged bubbles. Accordingly, even when the bubbles occur, since the inside of the main cylinder  53  can be reliably decompressed and the inside of the reservoir cylinder  90  can be efficiently filled with the liquid, stable injection can be performed without causing injection errors such as a case in which injection cannot be performed due to occurrence of bubbles, or the like. 
     Note that, for example, even in the case in which bubbles occurs in the vertical supply pipe  10  disposed above the ball valve  36  or in the connecting tube section  30  in addition to the case of the bubbles occurred in the main cylinder  53 , the bubbles can be finally discharged into the container body A while the bubbles is gradually drawn into the communication path  180 , and the same effect can be exhibited. 
     In addition, during an operation of the trigger  51 , since some of the pressure in the main cylinder  53  escapes into the container body A through the communication path  180 , it is possible to prevent so-called “dripping” in which, for example, the pressure in the main cylinder  53  is excessively increased and thus, the liquid is unexpectedly injected from the ejection hole  4 . Accordingly, good drainage can be achieved. 
     As described above, according to the trigger type liquid ejector  1  of the embodiment, the liquid can be injected not only when an operation of pulling the trigger  51  rearward is performed but also when the trigger  51  is not operated, and continuous injection of the liquid can be performed. 
     In particular, since the inside of the main cylinder  53  can be reliably decompressed, reduction in number of priming times, avoidance of injection errors, and so on, can be achieved, and it is possible to provide a trigger type liquid ejector  1  with high quality that can be easily used and having improved convenience. Further, for example, when a liquid containing surfactant or the like and in which bubbles easily occur is used, the trigger type liquid ejector  1  of the embodiment can be particularly suitably used. 
     In addition, since the communication hole  95  in communication with the ejection hole  4  and the supply hole  91  in communication with the inside of the ejection barrel  11  are formed in the reservoir cylinder  90  and the reservoir plunger  110  directly closes the communication hole  95  via the closing wall  122 , a spatial volume of a route from the connecting tube section  30  to the reservoir cylinder  90  (an interior volume occupied by the route) can be easily reduced with slight restriction. Accordingly, when the trigger  51  is operated, the liquid can be immediately supplied into the reservoir cylinder  90  from the inside of the connecting tube section  30 , the reservoir plunger  110  is easily immediately moved rearward by rapidly increasing the pressure in the reservoir cylinder  90 . For this reason, the liquid can be rapidly injected, and operability can be improved. 
     In addition, since the closing wall  122  that functions as an accumulator valve is provided and the closing wall  122  directly closes the communication hole  95 , it is possible to pressurize the liquid until the closing wall  122  opens the communication hole  95 . Accordingly, the liquid can be prevented from being immediately injected from the ejection hole  4  by the operation of the trigger  51 , and the liquid can be injected at an appropriate pressure (injection pressure). Accordingly, even in the case other than continuous injection, injection can be performed in an appropriate injection state by the operation of the trigger  51 . In addition, for example, during storage or the like, since a flow of the low pressure liquid toward the ejection hole  4  can be restricted by the closing wall  122 , leakage of the liquid from the ejection hole  4  can be effectively minimized. Further, since there is a need to separately provide a high pressure valve or the like, simplification of the configuration is easily achieved. 
     In addition, since the coil spring  160  is elastically deformed to accumulate a pressure by moving the reservoir plunger  110  rearward, the liquid can be injected in a pressurized state, and continuous injection in an appropriate injection state can be performed. 
     Further, when the liquid in the reservoir cylinder  90  is sprayed from the ejection hole  4 , outflow of the liquid from the reservoir cylinder  90  into the connecting tube section  30  can be restricted by the reservoir valve  102 . Accordingly, for example, the pressure of the liquid sprayed from the ejection hole  4  through the ejection barrel  11  can be easily increased. For this reason, an injection form of the liquid can be maintained from starting of injection to stopping of the injection, and the liquid can be easily injected in various injection types. 
     In addition, when the reservoir plunger  110  is disposed at the most retracted position, the first lip section  123  of the reservoir plunger  110  is disposed on the communicating groove  140 . Here, since the inside of the front tube section  96  is in communication with the collecting hole  141  through the communicating groove  140 , the inside of the reservoir cylinder  90  and the inside of the container body A are in communication with each other through the collecting hole  141  and the collecting passage  142 . 
     Accordingly, in a state in which the reservoir plunger  110  is sufficiently moved rearward, when the liquid is further introduced into the reservoir cylinder  90 , the liquid can return into the container body A through the collecting hole  141  and the collecting passage  142 . Accordingly, an excessive increase of the pressure in the reservoir cylinder  90  can be prevented. 
     Note that, during advance of the reservoir plunger  110 , while the reservoir plunger  110  is moved to the most advanced position unless an operation of pulling the trigger  51  is performed again, the operation of pulling the trigger  51  may be repeated before that. 
     In this case, the reservoir plunger  110  moves backward gradually as a whole while repeatedly moving backward and forward. Accordingly, the liquid can be gradually stored in the reservoir cylinder  90 . Then, the liquid can be continuously injected for a long time until the reservoir plunger  110  moves from the most retracted position to the most advanced position by, for example, moving the reservoir plunger  110  to the most retracted position. 
     Note that, the technical spirit of the present invention is not limited to the embodiment, and various modifications may be made without departing from the spirit of the present invention. 
     For example, in the embodiment, a mechanism configured to lock an operation of the trigger  51  or a switching member disposed in front of the ejection hole  4  and configured to switch an injection form (for example, a fog shape, a bubble shape, or the like) of the liquid may be further provided. 
     In addition, while the trigger  51  is swingable rearward, a rearward moving type of the trigger  51  can be appropriately employed. For example, the trigger  51  may be slidable rearward. 
     In the embodiment, the connecting tube section  30  and the reservoir cylinder  90  may not include the common partition wall W 3 , or vertical supply pipe  10  and the reservoir cylinder  90  may not include the common partition wall W 4 . Further, in the embodiment, the connecting tube section  30  and the closing-off plug  31  are not essential and may not be provided. 
     In the embodiment, while the reservoir plunger  110  is moved rearward according to supply of the liquid into the reservoir cylinder  90 , it may not be limited to the case. 
     For example, a configuration in which the reservoir plunger  110  is moved forward according to supply of the liquid into the reservoir cylinder  90  may also be employed. Further, a configuration in which the axis O 2  of the reservoir cylinder  90  extends in a direction different from the forward/rearward direction and the reservoir plunger  110  is moved in the axial direction along the axis O 2  (a direction different from the forward/rearward direction) may also be employed. 
     In the embodiment, while the reservoir plunger  110  is recovered and moved using an elastic recovering force (a biasing force) of the coil spring  160 , it is not limited to the case. For example, in addition to the biasing force of the coil spring  160  or instead of the biasing force, a configuration disclosed below may also be employed. 
     That is, a configuration in which the ejector main body  2  includes a negative pressure plunger connected to the reservoir plunger  110  and linked to movement of the reservoir plunger  110  in the axial direction, and a negative pressure cylinder extending in the axial direction, configured to block communication between the other end opening of the reservoir plunger  110  in the axial direction and the outside, and in which the negative pressure plunger is accommodated to be movable toward one side in the axial direction may be employed. 
     In this case, the reservoir plunger  110  is moved toward one side in the axial direction together with the negative pressure plunger in the negative pressure cylinder according to supply of the liquid into the reservoir cylinder  90 . Here, a closed space in the negative pressure cylinder disposed on the other side than the negative pressure plunger in the axial direction becomes a negative pressure. Accordingly, a biasing force toward the other side in the axial direction is applied to the negative pressure plunger and the reservoir plunger  110 . As a result, the reservoir plunger  110  can be recovered and moved using the biasing force. 
     As the above-mentioned configuration is employed, when the reservoir plunger  110  is recovered and moved, since the negative pressure in the negative pressure cylinder is used, for example, even though the biasing force applied from the other member such as the coil spring  160  or the like is not used, the reservoir plunger  110  can be recovered and moved. Accordingly, a thrust force can be applied to the reservoir plunger  110  while achieving simplification of the structure. Moreover, since the coil spring  160  that is generally formed of a metal material is not used, the trigger type liquid ejector  1  can also be formed of a synthetic resin material only. 
     In the embodiment, while the ejection barrel  11  extends forward from the reservoir cylinder  90 , it is not limited to the case. In addition, while the supply hole  91  and the communication hole  95  are separately formed, for example, the supply hole  91  may function as the communication hole  95 . Further, the connecting tube section  30  and the closing-off plug  31  are not essential and may not be provided. 
     In the embodiment, while the piston guide  62  is formed in a topped tubular shape, it is not limited to the case, and for example, the piston guide  62  may be formed in a solid columnar shape. In this case, a communication opening may be formed throughout the length of the piston guide  62 , and may be in communication with the inside of the fitting tube section  41 . Even in this case, the same effect can be achieved. 
     In addition, while the connecting passage  184  is formed in the vertical supply pipe  10  between the inner circumferential surface of the small diameter section  12   b  of the outer tube  12  and the outer circumferential surface of the small diameter section  13   b  of the inner tube  13  and the inside of the fitting tube section  41  and the inside of the third ventilation hole  66  are in communication with each other through the connecting passage  184 , it is not limited to the case. 
     For example, the connecting passage  184  may be in communication with the vertical supply pipe  10 , and the inside of the fitting tube section  41  and the inside of the container body A may be in communication with each other through the inside of the connecting passage  184  and the inside of the vertical supply pipe  10 . Even in this case, the inside of the main cylinder  53  and the inside of the container body A can be in communication with each other through a route different from a route via the communicating tube  63 . 
     Further, in the embodiment, while the inside of the main cylinder  53  and the inside of the container body A are in communication with each other through, mainly, a space between the inner circumferential surface of the piston main body section  72  and the outer circumferential surface of the piston guide  62 , and the communication path  180  via the inside of the piston guide  62 , it is not limited to the case. 
     For example, the inside of the main cylinder  53  and the inside of the container body A may be in communication with each other through a communication path via a space between the outer circumferential surface of the main piston  52  (specifically, the outer circumferential surface of the sliding tube section  73 ) and the inner circumferential surface of the main cylinder  53  (specifically, the inner circumferential surface of the outer tube section  60 ). In this case, for example, the annular recessed section  181  may be formed in the inner circumferential surface of the outer tube section  60  on the side of the rear end portion, and when the main piston  52  is disposed at the rearmost position, the outer lip section  73   a  may be accommodated in the recessed section  181 . Even in this case, the same effect can be achieved. Further, in this case, the piston guide  62  may also be omitted. 
     However, when the communication path  180  is formed as described in the embodiment, since the inside of the piston guide  62  can be effectively used, it is preferably to easily form the communication path  180 . In addition, since movement of the main piston  52  can be guided using the piston guide  62 , the main piston  52  can be easily smoothly moved with less rattling. Accordingly, operability of the trigger  51  can be improved, and injection of the liquid can be smoothly performed. 
     INDUSTRIAL APPLICABILITY 
     According to the present invention, since an inside of a main cylinder can be reliably decompressed, reduction in number of priming times, avoidance of injection errors, and so on, can be achieved, and it is possible to provide a trigger type liquid ejector with high quality that can be easily used and having improved convenience. 
     REFERENCE SIGNS LIST 
     A Container body 
     O 2  Central axis of reservoir cylinder 
       1  Trigger type liquid ejector 
       2  Ejector main body 
       3  Nozzle member 
       4  Ejection hole 
       10  Vertical supply pipe 
       11  Ejection barrel 
       36  Ball valve (first check valve) 
       50  Trigger mechanism 
       51  Trigger 
       52  Main piston 
       53  Main cylinder 
       62  Piston guide 
       63  Communicating tube (communication section) 
       72   a  Inner lip section (lip section of main piston) 
       90  Reservoir cylinder 
       102  Reservoir valve (second check valve) 
       110  Reservoir plunger 
       122  Closing wall (accumulator valve) 
       180  Communication path