JP2022183988A - Trigger type liquid ejection device - Google Patents

Abstract

To provide a trigger type liquid ejection device capable of ensuring durability of an urging member and exhibiting good ejection performance over a long period of time.SOLUTION: In a trigger type liquid ejection device 1 of the aspect according to the present invention, an ejection device body 10 has a vertical supply cylindrical part 20 extending in a vertical direction, a trigger part 45 provided in front of the vertical supply cylindrical part 20 so as to be movable in a longitudinal direction, and an urging member 46 made of a resin material that urges the trigger part 45 forward, and includes a trigger mechanism 24 that circulates a liquid from the vertical supply cylindrical part 20 toward an ejection hole 11a side by moving the trigger part 45 rearward. The urging member 46 includes: a pair of elastic parts 46a extending in a longitudinal direction on both sides in a left and right direction with respect to the vertical supply cylindrical part 20, whose front ends are connected to the trigger part 45 and are elastically displaceable in the longitudinal direction; and a connection part 46b that connects the rear ends of the pair of elastic parts 46a to each other at the rear of the vertical supply cylindrical part 20.SELECTED DRAWING: Figure 1

Description

The present invention relates to trigger-type liquid ejectors.

The trigger-type liquid ejector includes a vertically extending vertical supply cylinder, a trigger provided in front of the vertical supply cylinder so as to be movable back and forth, a cylinder communicating with the vertical supply cylinder, and a back and forth movement of the trigger. The nozzle member includes a piston that slides back and forth on the inner peripheral surface of the cylinder and a nozzle member that has a jet hole (see, for example, Patent Document 1 below). An injection cylinder portion extending forward is provided at the upper end portion of the vertical supply cylinder portion. A nozzle member is arranged in front of the injection cylinder portion with the injection hole directed forward.
According to this configuration, when the trigger portion is pulled rearward, the liquid contained in the cylinder flows through the vertical supply cylinder portion and the injection cylinder portion toward the ejection hole. As a result, the liquid is ejected through the ejection holes. On the other hand, when the trigger part is released and the trigger part returns forward, the liquid in the container body is sucked up into the vertical supply cylinder part. The liquid sucked into the vertical supply cylinder flows into the cylinder.

By the way, in the configuration of Patent Document 1 below, the trigger portion is biased forward via a biasing member. The biasing member is interposed between the ejection tube portion and the trigger portion in front of the vertical supply tube portion.

Japanese Patent Application Laid-Open No. 2020-82042

However, in the conventional trigger-type liquid ejector, it is difficult to secure the length of the biasing member, and the strain of the biasing member due to the operation of the trigger portion tends to increase. In this case, therefore, the strain due to repeated use of the trigger type liquid ejector tends to increase, and the urging member tends to wear out. When the urging member is sagging, it becomes difficult to secure the urging force of the urging member, and the jetting performance may deteriorate.

SUMMARY OF THE INVENTION The present invention provides a trigger-type liquid ejector that ensures durability of an urging member and can exhibit good ejection performance over a long period of time.

In order to solve the above problems, the present disclosure employs the following aspects.
A trigger-type liquid ejector according to an aspect of the present disclosure includes an ejector main body attached to a container body containing a liquid, and an ejection hole attached to a front end portion of the ejector main body and ejecting the liquid forward. is formed, the ejector body includes a vertical supply tube portion extending in the vertical direction, a trigger portion provided in front of the vertical supply tube portion so as to be movable in the front-rear direction, and the trigger a trigger mechanism that has a biasing member made of a resin material that biases the portion forward, and causes the liquid to flow from the vertical supply cylinder portion toward the ejection hole side by moving the trigger portion backward; a pair of urging members each extending in the front-rear direction on both sides in the left-right direction with respect to the vertical supply tube portion, and having a front end connected to the trigger portion and provided so as to be elastically displaceable in the front-rear direction. and a connecting portion that connects the rear end portions of the pair of elastic portions to each other at the rear of the vertical supply tube portion.

According to this aspect, by connecting the rear end portions of the pair of elastic portions to each other at the rear of the vertical supply tube portion, it becomes easy to secure the length of the elastic portion. Therefore, it is possible to reduce the distortion of the elastic portion caused by repeated use of the trigger type liquid ejector. As a result, settling of the biasing member can be suppressed, and the biasing force of the biasing member can be secured over a long period of time. As a result, good ejection performance can be maintained over a long period of time.
In addition, since settling of the biasing member can be suppressed, it is possible to use a material such as an olefin-based resin at low cost and excellent in moldability as the biasing member. Therefore, compared to the case where a hard resin material such as POM is used for the biasing member, it is possible to provide a trigger-type liquid ejector that is low in cost and excellent in shape accuracy.

In the trigger-type liquid ejector of the aspect described above, it is preferable that the biasing member is formed separately from the vertical supply tube portion, and the connecting portion is attached to the vertical supply tube portion.
According to this aspect, the degree of freedom in design can be improved compared to the case where the biasing member is formed integrally with the vertical supply tube portion. Moreover, by mounting the urging member on the vertical supply tube portion, it is possible to improve the degree of freedom of the cover functioning as the exterior body.

In the trigger-type liquid ejector of the aspect described above, the trigger mechanism is provided in front of the vertical supply tube portion so as to protrude on both sides in the left-right direction with respect to the vertical supply tube portion, and is a cylinder that communicates with the vertical supply tube portion. and a piston that is slidably provided on the inner peripheral surface of the cylinder and that moves in the longitudinal direction with respect to the cylinder as the trigger portion moves in the longitudinal direction, wherein the elastic portion comprises the It is preferable to extend in the front-rear direction through one side in the vertical direction of the cylinder on both sides in the left-right direction with respect to the vertical supply tube portion.
According to this aspect, the size of the trigger-type liquid ejector can be reduced in the left-right direction compared to a configuration in which the elastic portion extends in the front-rear direction on both the left and right sides of the cylinder.

In the trigger-type liquid ejector of the aspect described above, it is preferable that the elastic portion is formed in an arcuate shape protruding toward one side in the vertical direction when viewed from the left-right direction.
According to this aspect, it is easier to ensure the length of the elastic portion than in a configuration in which the elastic portion extends linearly between the connection portion and the trigger portion. In addition, since the elastic portion is flexurally deformed in accordance with the operation of the trigger portion, it is possible to suppress excessive urging force compared to the case where the elastic portion is elastically displaced by compression or buckling deformation. As a result, excellent operability can be exhibited and durability can be ensured.

In the trigger-type liquid ejector of the aspect described above, the trigger unit includes a trigger body having a front wall portion that extends vertically in front of the vertical supply tube portion and can be gripped, and protrudes from the trigger body, It is preferable to include a spring receiving portion with which the elastic portion abuts from behind.
According to this aspect, it is easier to secure the rigidity of the trigger body than, for example, a configuration in which the elastic portion is locked in a concave portion formed in the trigger body. As a result, good ejection performance can be maintained over a long period of time.
Further, by connecting the trigger main body and the elastic portion by bringing the elastic portion into contact with the spring bearing portion, it is possible to prevent the trigger portion from being caught at the time of initial movement. Thereby, the trigger part can be moved back and forth smoothly.

According to the aspect of the present invention, it is possible to secure the durability of the biasing member and exhibit good ejection performance over a long period of time.

1 is a longitudinal sectional view of a trigger type liquid ejector according to a first embodiment; FIG. FIG. 4 is a partial perspective view of the trigger-type liquid ejector with the cover removed, as seen from the rear; FIG. 7 is a vertical cross-sectional view of a trigger-type liquid ejector according to a second embodiment; FIG. 11 is a vertical cross-sectional view of a trigger type liquid ejector according to a third embodiment; FIG. 4 is a partial perspective view of the trigger-type liquid ejector with the cover removed, as seen from the rear;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments according to the present invention will be described with reference to the drawings. In the embodiments and modifications described below, the same reference numerals may be assigned to corresponding configurations, and descriptions thereof may be omitted.

(First embodiment)
As shown in FIG. 1, a trigger-type liquid ejector 1 of this embodiment is capable of ejecting liquid contained in a container body A. As shown in FIG. A trigger type liquid ejector 1 includes an ejector body 10 , a nozzle member 11 and a cover 13 .
In addition, each component of the trigger type liquid ejector 1 is a molded product using a synthetic resin such as an olefin resin unless otherwise specified.

The ejector main body 10 includes a vertical supply cylinder portion 20 , a mounting cap 21 , a pipe 22 , a trigger mechanism 24 having a pump portion 23 , an injection cylinder portion 25 and a relay member 26 .

Hereinafter, the direction (axial direction) along the axis O1 of the vertical supply tube portion 20 is defined as the vertical direction, the bottom (not shown) side of the container body A is defined as the lower side, and the opposite side is defined as the upper side. A direction that intersects the axis O1 when viewed from above and below is defined as a radial direction. The direction in which the vertical supply tube portion 20 and the nozzle member 11 are aligned in the radial direction is defined as the front-rear direction. In the front-rear direction, the nozzle member 11 side with respect to the vertical supply tube portion 20 is the front side, and the opposite side is the rear side. Moreover, let the direction orthogonal to the front-back direction seen from an up-down direction among radial directions be a left-right direction.

The vertical supply tubular portion 20 sucks up the liquid in the container body A through the mouth portion A1 of the container body A. As shown in FIG. The vertical supply tube portion 20 is formed in a multi-stage tube shape in which the diameter of the vertical supply tube portion 20 decreases with increasing position. Specifically, the vertical supply tube portion 20 includes a small diameter portion 20a positioned above, and a large diameter portion 20c continuous below the small diameter portion 20a via a stepped portion 20b. In the illustrated example, the vertical supply tube portion 20 has a double tube structure including an outer tube and an inner tube disposed inside the outer tube.

The large-diameter portion 20c is provided with a flange portion 20d projecting radially outward.
A ball valve 28 is provided at an intermediate portion in the vertical direction within the small diameter portion 20a. The ball valve 28 contacts and separates from above a lower valve seat portion 20e that protrudes into the small diameter portion 20a. The ball valve 28 switches communication and disconnection between the inside of the container body A and the pump section 23 through the vertical supply tube section 20 in the small diameter section 20a. Specifically, the ball valve 28 allows liquid to flow from the container body A to the pump portion 23 through the vertical supply tube portion 20 in a state of being separated upward from the lower valve seat portion 20e. The ball valve 28 regulates the flow of liquid from the pump section 23 into the container body A through the vertical supply tube section 20 when seated on the lower valve seat section 20e.

A switching valve 29 is provided at the upper end portion (a portion located above the ball valve 28) within the small diameter portion 20a. The switching valve 29 is integrally formed of an elastically deformable material such as LDPE (low density polyethylene). The switching valve 29 is fitted in the small-diameter portion 20a so as to be movable upward in a downwardly biased state. The switching valve 29 contacts and separates from above an upper valve seat portion 20f that protrudes into the small diameter portion 20a. The switching valve 29 switches communication and disconnection between the pump portion 23 and the injection cylinder portion 25 through the vertical supply cylinder portion 20 in the small diameter portion 20a. Specifically, the switching valve 29 allows the liquid to flow through the vertical supply tube portion 20 from the pump portion 23 to the injection tube portion 25 in a state of being separated upward from the upper valve seat portion 20f. The switching valve 29 regulates the flow of liquid through the vertical supply cylinder portion 20 from the injection cylinder portion 25 to the pump portion 23 in a state of being seated on the upper valve seat portion 20f.

The mounting cap 21 is formed in a tubular shape extending in the vertical direction. The mounting cap 21 is detachably fastened to the opening A1 of the container body A with the flange 20d sandwiched between it and the upper opening edge of the opening A1. The method of fixing the mounting cap 21 and the opening A1 may be a method other than screws (for example, fitting).

The pipe 22 is inserted into the vertical supply tubular portion 20 through the inner side of the large-diameter portion 20c and is fitted into the small-diameter portion 20a from below. The pipe 22 extends downward inside the container body A when the trigger type liquid ejector 1 is attached to the container body A. As shown in FIG.

The injection tube portion 25 guides the liquid inside the vertical supply tube portion 20 toward the nozzle member 11 . The injection cylinder portion 25 extends forward from a portion of the upper end portion of the vertical supply cylinder portion 20 located above the upper valve seat portion 20f.
The relay member 26 connects between the injection cylinder portion 25 and the nozzle member 11 . The relay member 26 is attached to the ejection cylinder portion 25 from the front.

The trigger mechanism 24 includes a pump portion 23 , a trigger portion 45 and an urging member 46 .
The pump section 23 stores and pumps the liquid in the container body A according to the movement of the trigger section 45 . The pump section 23 includes a cylinder 51 and a piston 52 .
The cylinder 51 is provided in front of the small diameter portion 20a of the vertical supply tube portion 20. As shown in FIG. The cylinder 51 is formed in a bottomed tubular shape that protrudes on both sides in the left-right direction with respect to the vertical supply tubular portion 20 (small diameter portion 20a) and opens forward. The cylinder 51 has a double cylinder structure including a cylinder outer cylinder integrally provided with the vertical supply cylinder portion and a cylinder inner cylinder provided inside the cylinder outer cylinder.

The cylinder 51 includes a bottom wall portion 51a, a cylinder tube 51b, and a piston guide 51c.
The bottom wall portion 51a is formed in a disc shape centered on the cylinder axis O2 extending in the front-rear direction. The outer diameter of the bottom wall portion 51a is larger than the outer diameter of the small diameter portion 20a. Therefore, the bottom wall portion 51a protrudes on both sides in the left-right direction with respect to the small-diameter portion 20a. A communication hole 51d is formed in an outer peripheral portion (a portion positioned above the cylinder axis O2) of the bottom wall portion 51a. 51 d of communicating holes are opened in the part located between the ball valve 28 and the switching valve 29 among the small diameter parts 20a. The communication hole 51d communicates the inside of the cylinder 51 and the inside of the small diameter portion 20a. In the following description, the direction that intersects the cylinder axis O2 when viewed from the front-rear direction may be referred to as the radial direction of the pump.

The cylinder tube 51b extends forward from the outer peripheral edge of the bottom wall portion 51a.
The piston guide 51c protrudes forward from a portion of the bottom wall portion 51a located on the cylinder axis O2.

The piston 52 is provided inside the cylinder 51 so as to be movable in the front-rear direction. The piston 52 includes a piston body 52a, a piston flange 52b, and a sliding cylinder portion 52c.
The piston main body 52a is formed in a capped tubular shape centered on the piston axis O3 extending in the front-rear direction. In this embodiment, the cylinder axis O2 and the piston axis O3 are arranged coaxially. A piston guide 51c is inserted into the piston body 52a from behind. The piston body 52a is configured to be movable in the front-rear direction while being guided by the piston guide 51c.

The piston flange 52b protrudes radially outward from the rear end of the piston body 52a.
The sliding cylinder portion 52c continues to the outer peripheral edge of the piston flange 52b. The sliding tubular portion 52c is formed in a tubular shape coaxial with the piston axis O3. The sliding cylinder portion 52c surrounds the piston body 52a from the outside in the pump radial direction. The sliding cylinder portion 52c is in close contact with the inner peripheral surface of the cylinder cylinder 51b at both edges in the front-rear direction. As the piston 52 moves back and forth with respect to the cylinder 51, the sliding cylinder portion 52c slides on the inner peripheral surface of the cylinder cylinder 51b.

The trigger part 45 is provided in front of the pump part 23 so as to be movable back and forth. Specifically, the trigger portion 45 includes a trigger main body 45a, a support piece 45b, a connecting portion 45c, and a spring receiving portion 45d.
The trigger body 45a has a front wall portion 71 and a peripheral wall portion 72, and is formed in a shallow box shape that is open rearward. The trigger body 45a extends in front of the pump portion 23 while being inclined forward as it goes downward from above. The trigger part 45 is configured to be movable back and forth by being gripped via the trigger main body 45a (front wall part 71).

A pair of left and right support pieces 45b are provided at the upper end portion of the trigger body 45a. The support pieces 45 b extend upward on both sides in the left-right direction with respect to the relay member 26 . An upper end portion of each support piece 45b is supported by the relay member 26 so as to be rotatable around an axis along the left-right direction.
The connecting portion 45 c protrudes in the left-right direction from the upper end portion of the peripheral wall portion 72 . The connecting portion 45c is connected to the front end portion of the piston body 52a. Therefore, the piston 52 moves rearward with respect to the cylinder 51 as the trigger portion 45 moves rearward.
A pair of spring receiving portions 45 d are provided on both left and right sides of the peripheral wall portion 72 . The spring receiving portion 45d protrudes from the trigger body 45a (peripheral wall portion 72) to both sides in the left-right direction. Each spring receiving portion 45d is open upward and rearward.

As shown in FIGS. 1 and 2, the biasing member 46 biases the trigger portion 45 forward. The biasing member 46 is formed in a U shape in plan view. The biasing member 46 includes a pair of elastic portions 46a and a connecting portion 46b. Incidentally, in the present embodiment, the biasing member 46 is also integrally formed of an olefin resin (for example, PP or the like).

The connection portion 46b is formed in an arc shape that surrounds the upper end portion of the vertical supply cylinder portion 20 from the rear to both sides in the left-right direction in a plan view. The connecting portion 46b increases in radial dimension from both ends in the circumferential direction toward the central portion (rear end).

The connecting portion 46b is locked by a locking portion 60 provided on the vertical supply tube portion 20. As shown in FIG. The locking portion 60 includes an upper locking piece 60a and a lower locking piece 60b. The locking pieces 60a and 60b project radially outward from the vertical supply tube portion 20 while being spaced apart from each other in the vertical direction. Each locking piece 60a, 60b is formed in an arc shape surrounding the upper end portion of the vertical supply tube portion 20 from the rear to both sides in the left-right direction in plan view. The connection portion 46b is attached to the vertical supply tube portion 20 in a state where movement relative to the vertical supply tube portion 20 is restricted by being inserted between the locking pieces 60a and 60b.

The elastic portions 46a extend forward from both ends of the connecting portion 46b. That is, the connecting portion 46b integrally connects the rear ends of the elastic portions 46a. Each elastic portion 46 a is arranged on both sides in the left-right direction with respect to the vertical supply tube portion 20 . Each elastic portion 46a has an arcuate shape that protrudes upward in a side view. Each elastic portion 46 a passes over a portion of the cylinder 51 that protrudes from the vertical supply tube portion 20 and extends from the upper end portion of the vertical supply tube portion 20 to the front of the cylinder 51 . Therefore, a part of each elastic portion 46a overlaps with the injection cylinder portion 25 in side view, and overlaps with the cylinder 51 in plan view.

The elastic portion 46a has a rectangular cross section perpendicular to the extending direction. The cross-sectional area of the elastic portion 46a is gradually reduced toward the front. In the elastic portion 46a, the vertical dimension at the rear end portion is larger than the vertical dimension of the connecting portion 46b. Therefore, the rear end portion of the elastic portion 46a protrudes on both sides in the vertical direction with respect to the connecting portion 46b. The rear end surface of the elastic portion 46a approaches or abuts the front end edges of the locking pieces 60a and 60b from the front. However, the cross-sectional shape and the like of the elastic portion 46a can be changed as appropriate.
A front end portion (lower end portion) of the elastic portion 46 a is accommodated in the spring receiving portion 45 d in front of the cylinder 51 . The elastic portion 46a is connected to the inner surface of the spring receiving portion 45d within the spring receiving portion 45d. In the illustrated example, the elastic portion 46a is connected to the trigger portion 45 by coming into contact with the rearward surface of the inner surface of the spring receiving portion 45d. In this embodiment, the elastic portion 46a contacts the inner surface of the spring receiving portion 45d to be "connected" to the trigger portion 45. However, the connecting structure between the elastic portion 46a and the trigger portion 45 does not contact the spring receiving portion 45d. is not limited to That is, in the present embodiment, the state in which the elastic portion 46a and the trigger portion 45 are “connected” is to contact the trigger portion 45 so that the biasing force of the elastic portion 46a can be transmitted. In this case, it may be a configuration of physical connection other than abutment such as engagement or fixation by claws or the like, and includes a state of being chemically connected (joined) such as adhesion.

The elastic portion 46a is configured to be elastically deformable (flexurally deformable) in a direction orthogonal to the extending direction. In the present embodiment, the elastic portion 46a is flexurally deformed starting from the rear end portion, so that the front end portion is elastically displaced in the front-rear direction. Therefore, the elastic portion 46a is interposed between the upper end portion of the vertical supply tube portion 20 and the trigger portion 45, and biases the trigger portion 45 forward.

As shown in FIG. 1, the nozzle member 11 is attached to the relay member 26 from the front. The nozzle member 11 is formed in a bottomed tubular shape that opens rearward. A top wall portion (front wall portion) of the nozzle member 11 is formed with a jet hole 11a extending in the front-rear direction. The ejection hole 11 a communicates with the injection cylinder portion 25 through the inside of the nozzle member 11 and the inside of the relay member 26 .

The cover 13 surrounds a portion of the ejector body 10 located above the mounting cap 21 from above, rear and sides. The cover 13 is attached to the ejector body 10 by inserting the ejector body 10 toward the front.

The cover 13 includes a top wall portion 13a, a rear wall portion 13b, a bottom wall portion 13c, and side wall portions 13d.
The ceiling wall portion 13 a extends linearly from the front to the rear above the relay member 26 , the ejection cylinder portion 25 and the vertical supply cylinder portion 20 .
The rear wall portion 13b extends while curving rearward from the rear end of the top wall portion 13a.
The bottom wall portion 13c extends forward from the lower edge of the rear wall portion 13b. The front edge of the bottom wall portion 13c is close to the large diameter portion 20c from behind.
The side wall portions 13d are arranged on both sides of the ejector main body 10 in the left-right direction. The outer peripheral edge of each side wall portion 13d continues to the lateral edge of each of the top wall portion 13a, the rear wall portion 13b, and the bottom wall portion 13c.

Next, the case of using the trigger type liquid ejector 1 configured as described above will be described.
It is assumed that each part of the trigger type liquid ejector 1 is filled with liquid by operating the trigger part 45 a plurality of times, and the liquid can be sucked up into the vertical supply cylinder part 20 .

First, when the trigger portion 45 is pulled rearward through the trigger body 45a, the trigger portion 45 rotates around the support piece 45b, thereby moving the trigger portion 45 rearward. Then, the elastic portion 46a is flexurally deformed by being pushed rearward through the spring receiving portion 45d. As a result, the elastic portion 46a is elastically displaced rearward as the trigger portion 45 moves rearward. As a result, an urging force is applied to the trigger portion 45 toward the front. When the trigger portion 45 moves backward, the elastic portion 46a may slide on the inner surface of the spring receiving portion 45d.

When the trigger part 45 moves rearward, the piston 52 moves rearward with respect to the cylinder 51 . Then, the inside of the cylinder 51 is pressurized by the sliding cylinder portion 52c sliding on the inner peripheral surface of the cylinder cylinder 51b. As a result, the liquid in the cylinder 51 is supplied into the vertical supply tube portion 20 (small diameter portion 20a) through the communication hole 51d. Then, the ball valve 28 is pressed toward the lower valve seat portion 20e by the pressure of the liquid supplied to the small diameter portion 20a, and communication between the inside of the container body A and the inside of the vertical supply tube portion 20 is blocked. As a result, the liquid in the small-diameter portion 20a flows through the vertical supply tube portion 20 upward.

As the liquid flows into the small diameter portion 20a, the space surrounded by the ball valve 28 and the switching valve 29 in the small diameter portion 20a is pressurized. Then, the switching valve 29 is pushed upward, thereby separating the switching valve 29 from the upper valve seat portion 20f. As a result, the inside of the small-diameter portion 20 a and the inside of the injection cylinder portion 25 are communicated with each other, so that the liquid inside the small-diameter portion 20 a flows toward the injection cylinder portion 25 . The liquid flowing through the ejection cylinder portion 25 reaches the nozzle member 11 through the relay member 26 and is ejected through the ejection holes 11a.

When the operation of the trigger portion 45 is released, the trigger portion 45 moves forward due to the restoring force of the elastic portion 46a. Along with this, the piston 52 is restored forward relative to the cylinder 51 . As a result, the pressure inside the piston 52 is reduced. As a result, the ball valve 28 is lifted from the lower valve seat portion 20e and communicates with the inside of the container body A through the cylinder 51 and the inside of the small diameter portion 20a. On the other hand, the switching valve 29 remains seated on the upper valve seat portion 20f, thereby blocking communication between the inside of the cylinder 51 and the inside of the injection cylinder portion 25 through the inside of the small diameter portion 20a. As a result, the liquid in the container body A is sucked up into the vertical supply tubular portion 20 . The liquid that has flowed into the vertical supply tube portion 20 is introduced into the cylinder 51 through the communication hole 51d, thereby preparing for the next ejection operation.

As described above, in the present embodiment, the biasing member 46 includes a pair of elastic portions 46a extending in the front-rear direction on both sides in the left-right direction with respect to the vertical supply tube portion 20, and rear end portions of the pair of elastic portions 46a. and a connection portion 46b that connects the vertical supply tube portion 20 to the rear of the vertical supply cylinder portion 20.
According to this configuration, by connecting the rear end portions of the pair of elastic portions 46a to each other behind the vertical supply cylinder portion 20, it becomes easy to secure the length of the elastic portions 46a. Therefore, the strain of the elastic portion 46a caused by the operation of the trigger portion 45 can be reduced. As a result, fatigue of the biasing member 46 due to repeated use of the trigger type liquid ejector 1 can be suppressed, and the biasing force of the biasing member 46 can be secured over a long period of time. As a result, good ejection performance can be maintained over a long period of time.
In addition, since settling of the biasing member 46 can be suppressed, a material such as an olefin-based resin can be used as the biasing member 46 at a low cost and excellent in moldability. Therefore, compared to the case where a hard resin material such as POM is used for the urging member, the degree of freedom in material selection is improved, and the trigger type liquid ejector 1 with excellent shape accuracy can be provided at low cost. In addition, by adopting olefin resin for the biasing member 46 as in the present embodiment, the entire trigger type liquid ejector 1 can be made of olefin resin, thereby reducing the environmental load. can be done.

In the present embodiment, the urging member 46 is formed separately from the vertical supply tube portion 20 and is attached to the vertical supply tube portion 20 via the connection portion 46b.
With this configuration, the degree of freedom in design can be improved compared to the case where the biasing member 46 is formed integrally with the vertical supply tube portion 20 . Moreover, by attaching the biasing member 46 to the vertical supply tube portion 20, the degree of freedom of the cover 13 functioning as an exterior body can be improved.

In this embodiment, the elastic portion 46 a extends in the front-rear direction through the upper portion of the cylinder 51 that protrudes from the vertical supply tube portion 20 .
According to this configuration, the size of the trigger-type liquid ejector 1 can be reduced in the left-right direction compared to the configuration in which the elastic portion 46a extends in the front-rear direction on both the left and right sides of the cylinder 51 .

In the present embodiment, the elastic portion 46a is formed in an arcuate shape that protrudes upward when viewed in the left-right direction.
According to this configuration, it is easier to secure the length of the elastic portion 46a compared to the configuration in which the elastic portion 46a extends linearly between the connecting portion 46b and the trigger portion 45 . In addition, since the elastic portion 46a is flexurally deformed with the operation of the trigger portion 45, it is possible to suppress excessive urging force compared to the case where the elastic portion 46a is elastically displaced by compression or buckling deformation. As a result, excellent operability can be exhibited and durability can be ensured.

In this embodiment, the trigger part 45 extends in the vertical direction in front of the vertical supply tube part 20, and has a trigger body 45a having a front wall part 71 that can be gripped, and protrudes from the trigger body 45a, and an elastic part 46a. and a spring receiving portion 45d that abuts from behind.
According to this configuration, it is easier to secure the rigidity of the trigger body 45a than, for example, a configuration in which the elastic portion is engaged with a concave portion formed in the trigger body. As a result, good ejection performance can be maintained over a long period of time.
Further, by connecting the trigger main body 45a and the elastic portion 46a by bringing the elastic portion 46a into contact with the spring receiving portion 45d, it is possible to prevent the trigger portion 45 from being caught at the initial movement. Thereby, the trigger part 45 can be moved back and forth smoothly.

(Second embodiment)
This embodiment differs from the first embodiment in that the biasing member 46 is attached to the cover 13 .
As shown in FIG. 3, in the cover 13, a locking hole 13f is formed in the front end portion of the rear wall portion 13b (the boundary portion with the ceiling wall portion 13a). A stepping projection 13g projecting downward is formed at the front opening edge of the locking hole 13f. The lower surface of the overriding protrusion 13g is inclined downward toward the rear.
A support wall 13h is formed in a portion of the rear wall portion 13b located behind the locking hole 13f. The front end of the support wall 13h reaches below the locking hole 13f inside the cover 13. As shown in FIG. Both left and right edges of the support wall 13h are connected to the side wall portion 13d.

In the biasing member 46, the connection portion 46b is inserted from the front inside the cover 13 between the rear wall portion 13b and the support wall 13h. A locking projection 46c protrudes upward from the connecting portion 46b. The locking projection 46c is locked in the locking hole 13f with the connecting portion 46b inserted between the rear wall portion 13b and the support wall 13h. The upper surface of the locking projection 46c is flush with the outer surface of the rear wall portion 13b in a state where the locking projection 46c is locked in the locking hole 13f. The locking projection 46c rides over the jumping projection 13g backward while the connecting portion 46b is being inserted between the rear wall portion 13b and the support wall 13h.

In this embodiment, the front end of each elastic portion 46a is housed inside the trigger body 45a. In the illustrated example, the front end of each elastic portion 46a abuts from behind against a rib 45f projecting from the trigger body 45a. That is, the elastic portion 46a biases the trigger portion 45 forward through the rib 45f. In the present embodiment, the rib 45f protrudes rearward from the front wall portion 71 and continues to the peripheral wall portion 72 at both ends in the left-right direction. A rear edge of the rib 45 f is located forward of the rear edge of the peripheral wall portion 72 . The elastic portion 46a elastically deforms rearward while sliding on the rib 45f when the trigger portion 45 moves rearward.

Also in this embodiment, since the pair of elastic portions 46a are connected by the connection portion 46b behind the vertical supply tube portion 20, it is easy to secure the length of the elastic portions 46a. In particular, in this embodiment, since the connecting portion 46b is supported by the cover 13, the elastic portion 46a can be longer than when the connecting portion 46b is supported by the vertical supply tube portion 20. FIG. Therefore, similarly to the above-described first embodiment, the durability of the biasing member 46 can be ensured, and good ejection performance can be exhibited over a long period of time.

(Third Embodiment)
This embodiment differs from the above-described embodiment in that the biasing member 46 is supported by the lower end portion of the small diameter portion 20a.
In the trigger type liquid ejector 1 shown in FIGS. 4 and 5, a locking piece 100 is formed at the lower end of the small diameter portion 20a. The locking piece 100 protrudes radially outward from the vertical supply tubular portion 20 while being vertically spaced from the stepped portion 20b. The locking piece 100 is formed in an arc shape that surrounds the upper end portion of the vertical supply tube portion 20 from the rear to both sides in the left-right direction in a plan view.

A connection portion 101 of the biasing member 46 is formed in an X shape when viewed from the rear. The connecting portion 101 connects the rear end portions of the elastic portions 46 a behind the vertical supply tube portion 20 and is attached to the vertical supply tube portion 20 . Specifically, the connecting portion 101 includes an upper end connecting portion 101a, a bridging portion 101b, and a lower end connecting portion 101c.

The upper end connecting portion 101a is formed in an arc shape surrounding the upper end portion of the vertical supply tube portion 20 from the rear to both sides in the left-right direction in plan view. The rear ends of the elastic portions 46a are integrally connected to both ends of the upper end connecting portion 101a.
The bridging portion 101b bridges between the upper end connecting portion 101a and the lower end connecting portion 101c. The bridging portion 101b is formed in an arcuate shape protruding rearward in a side view. The bridging portion 101b extends downward behind the vertical supply tube portion 20 .

The lower end connecting portion 101c extends forward from the lower end portion of the bridging portion 101b. The lower end connecting portion 101c is formed in an arc shape that surrounds the upper end portion of the vertical supply tube portion 20 from the rear to both sides in the left-right direction in a plan view. The lower end connecting portion 101c is attached to the vertical supply tube portion 20 by being inserted from behind between the stepped portion 20b and the locking piece 100. As shown in FIG. Locking projections 101d protruding upward are formed at both ends of the lower end connecting portion 101c. The locking projection 101d is locked to the front edge of the locking piece 100 from the front.

Thus, also in this embodiment, since the pair of elastic portions 46a are connected by the connecting portion 46b behind the vertical supply tube portion 20, it is easy to ensure the length of the elastic portions 46a. In particular, in the present embodiment, the biasing member 46 wraps around the upper end of the vertical supply tube portion 20 and is mounted at the lower end of the vertical supply tube portion 20 , so that the connection portion 46 b itself is also elastic to the biasing member 46 . can contribute to the displacement. This makes it easier to suppress the settling of the biasing member 46 .

Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments. Additions, omissions, substitutions, and other changes in configuration are possible without departing from the scope of the present invention. The present invention is not limited by the foregoing description, but only by the appended claims.
Although the configuration in which the trigger part 45 is rotatable has been described in the above-described embodiment, it is not limited to this lattice pattern. The trigger part 45 may be configured to be slidable as long as it is configured to be movable in the front-rear direction.
In the above-described embodiment, the configuration in which the biasing member 46 is provided separately from the trigger portion 45, the vertical supply cylinder portion 20, the cover 13, and the like has been described, but the configuration is not limited to this. The biasing member may be formed integrally with at least one member of the trigger portion 45 , the vertical supply tube portion 20 and the cover 13 .

In the embodiment described above, the configuration in which the elastic portion 46a is formed in an arcuate shape that protrudes upward has been described, but the configuration is not limited to this. The elastic portion 46a may be formed in an arcuate shape protruding downward. Further, the elastic portion 46a can be selected from various shapes such as a linear shape and a wavy shape as long as it is elastically displaced in the front-rear direction as the trigger portion 45 moves back and forth.
In the above-described embodiment, the elastic portion is connected (contacted) to the spring receiving portion 45d or the rib 45f. The elastic portion may be connected at any position of the trigger portion as long as it is connected at the rear of the vertical supply tube portion by the connection portion.

In addition, it is possible to appropriately replace the components in the above-described embodiment with well-known components without departing from the gist of the present invention, and the above-described modifications may be combined as appropriate.

1: trigger type liquid ejector 10: ejector main body 11: nozzle member 11a: ejection hole 20: vertical supply cylinder portion 24: trigger mechanism 45: trigger portion 45a: trigger main body 45d: spring receiving portion 45f: rib (spring receiving portion )
46: biasing member 46a: elastic portion 46b: connection portion 51: cylinder 52: piston 71: front wall portion 101: connection portion A: container body

Claims (5)

an ejector main body attached to a container body containing a liquid;
a nozzle member attached to the front end of the ejector body and formed with an ejection hole for ejecting liquid forward;
The ejector body is
a vertical supply tube portion extending in the vertical direction;
It has a trigger part provided in front of the vertical supply tube part so as to be movable in the front-rear direction, and a biasing member made of a resin material that biases the trigger part forward, and pushes the trigger part backward. a trigger mechanism that circulates the liquid from the vertical supply cylinder portion toward the ejection hole side by movement,
The biasing member is
a pair of elastic portions extending in the front-rear direction on both sides in the left-right direction with respect to the vertical supply tube portion, and having front ends connected to the trigger portion and provided so as to be elastically displaceable in the front-rear direction;
a connecting portion connecting the rear ends of the pair of elastic portions to each other at the rear of the vertical supply tube portion. The biasing member is formed separately from the vertical supply cylinder,
2. The trigger-type liquid ejector according to claim 1, wherein the connecting portion is attached to the vertical supply tube portion. The trigger mechanism is
a cylinder that is provided in front of the vertical supply cylinder portion and protrudes on both sides in the left-right direction with respect to the vertical supply cylinder portion and communicates with the vertical supply cylinder portion;
a piston slidably provided on the inner peripheral surface of the cylinder and moving in the longitudinal direction with respect to the cylinder as the trigger portion moves in the longitudinal direction;
3. The trigger type according to claim 1, wherein the elastic portion extends in the front-rear direction through one side of the cylinder in the up-down direction on both sides in the left-right direction with respect to the vertical supply tube portion. liquid ejector. The trigger-type liquid ejector according to any one of claims 1 to 3, wherein the elastic portion is formed in an arcuate shape protruding toward one side in the vertical direction when viewed from the left-right direction. The trigger section is
a trigger body having a front wall portion extending vertically in front of the vertical supply tube portion and capable of being gripped;
The trigger-type liquid ejector according to any one of claims 1 to 4, further comprising a spring receiving portion that protrudes from the trigger body and that the elastic portion abuts from behind.

Images