JPH10128185A - Trigger type liquid jetting pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a trigger type liquid jetting pump having a restoring mechanism of good restoring force for sucking a liquid and demonstrating the jet function in a good manner which can be formed of a material not requiring selection of synthetic resin and the like in place of a metal coil spring heretofore available as a mechanism for restoring a piston rod pushed in by the operation of a trigger and also can be formed in a compact structure. SOLUTION: An air chamber R blocked by a fixed seal section 13 and a movable seal section 14 is formed between a cylinder 6 and a piston rod 10, and the movable seal section is moved backward by pushing in the rod 10 by the trigger operation to expand the air chamber, and an actuating component 17 is restored following the restoration of the movable seal section by the negative pressure of the expanded air chamber in the constitution of a pump. Also an atmosphere introduction line of special structure is formed combinedly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a trigger type liquid ejection pump.

[0002]

2. Description of the Related Art As a trigger type liquid ejection pump, a mounting cap is fitted to the mouth and neck of a container body, and is fitted and fixed on the cap, and a cylinder is inserted from an intermediate portion of a vertical cylinder rising from the upper end of the cap. A pump body is provided with an injection cylinder projecting forward from the upper end thereof, and a trigger is associated with a tip of a piston rod protruding from the front end opening of the cylinder so as to be able to be pushed forward in a biased state. There is known a configuration in which the liquid inside the container is sucked up by the operation described above and is ejected from the front end of the injection cylinder.

[0003]

In a conventional pump of this type, the trigger and the pressurizing member return mechanism, that is, when the piston rod is moved rearward by pulling the trigger toward the front, they are returned to the original front position. In general, a metal coil spring is used as a return mechanism for returning to the normal state.

[0004] Although the above-mentioned metal coil springs can exhibit a good return function and a good pumping function of the pump, in recent waste disposal situations, the use of metal coil springs has been a problem. In addition, it has been extremely difficult to separate plastics from plastics because of the fact that these coil springs are generally fine and sealed inside. Also, when assembling, these coil springs are inconvenient to handle because of their fineness.

Although attempts have been made to use plastic coil springs in consideration of such circumstances, plastic coil springs are currently inferior in resilience, and as a result, the pressure member is not easily used. Operation may be hindered, which is not practical at present.

The present invention has been made in view of the above points, and can be formed entirely of a material such as a synthetic resin which does not require a separation process without using a metal coil spring. Trigger type liquid that has excellent return capability such as pressure members, does not need to be particularly large in size compared to conventional products, and has the advantage that it can be formed by partial structural changes of conventional products. It proposes an ejection pump.

[0007]

In order to solve the above-mentioned problems, a pump according to the present invention is provided with a mounting cap 4 fitted to the mouth and neck of a container body, and fitted and fixed on the mounting cap. A cylinder body 6 is protruded forward from an intermediate portion of the vertical cylinder 5 rising from the upper end, and an injection cylinder 7 is protruded forward from the upper part thereof, and an outer peripheral edge is slidably fitted on the inner surface of the cylinder. A pressurizing member 11 provided so as to be able to push the front end of a piston rod 10 in which the annular piston 9 protrudes from the outer periphery of the rear part and protrude forward of the cylinder 6.
And a trigger 12 in which an upper part is pivotally attached to the front part of the injection cylinder so as to hang down, and a front part of the piston rod 10 is linked to the upper part thereof. In the trigger type liquid ejection pump configured to eject from the front end of the cylinder 7, the outer peripheral portion is tightly fixed to the inner front portion of the cylinder 6, and the inner peripheral edge is slidably fitted to the outer surface of the piston rod 10. And a movable seal portion 14 protruding from the outer periphery of the rear part of the piston rod 10 and having its outer peripheral edge slidably fitted to the inner surface of the cylinder. A closed air chamber R is formed between the pressure chambers and the pressing member is operated by a trigger operation.
Trigger type liquid ejection characterized in that the movable seal portion 14 is moved forward by the negative pressure of the expanded air chamber R when the position 11 is shifted backward, and the trigger is returned to the original state. It was configured as a pump.

In the pump according to the second aspect of the present invention, the piston rod 10 is formed in a tubular shape having front and rear end openings.
The inner surface of the piston rod 10 is slidably tightly fitted to the outer surface of the auxiliary cylinder 17 projecting forward in a double cylindrical shape from the front surface of the vertical cylinder 5 inside the cylinder 6, and the vertical cylinder 5 at the center of the auxiliary cylinder 17 is slid.
A bulging part 18 on the outer periphery of the front part from the front into the front piston rod
The seal plate portion 20 is formed by projecting a seal rod 19 formed by bulging the seal plate and projecting from the inner surface of the front part of the piston rod 10 in a flange shape.
A seal portion B that is opened when the piston rod moves rearward by hermetically contacting the inner peripheral edge of the
One end is opened on the front surface of the vertical cylinder 5 inside the auxiliary cylinder 17, and a passage 21 is provided which opens inside the wall of the vertical cylinder 5 and opens above the neck of the container body, the other end of which is mounted. 17 and the piston rod 10 through the seal B
A trigger type liquid ejection pump according to claim 1 is provided with an outside air introduction path leading to a tip opening.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. As shown in the drawings, a trigger type liquid jet pump 1 of the present invention includes a mounting cap 4 fitted to a mouth and neck portion 3 of a container body 2, a vertical cylinder fitted and fixed on the cap, and rising from an upper end of the mounting cap. A pump body 8 is formed by projecting a cylinder 6 from an intermediate portion of the cylinder 5 and an injection cylinder 7 from the upper portion thereof, and an annular piston 9 whose outer peripheral edge is slidably fitted to the inner surface of the cylinder. A pressure member provided so that the tip of the more protruded piston rod 10 can be pushed forward by protruding forward from the cylinder 6.
11 and a trigger 12 in which the upper part is pivotally attached to the front part of the injection cylinder and is suspended therefrom, and the piston rod 10 is provided with a trigger 12 in which the front end part is linked to the upper part, and the operation of the trigger sucks up the liquid in the container body. It is provided with a known pump mechanism that is configured so as to blow out from the front end of the injection cylinder 7.

The pump according to the present invention is the same as the above-mentioned type of pump, except that the outer peripheral edge is tightly fixed to the front portion inside the cylinder 6 and the inner peripheral edge is slidably fitted to the outer surface of the piston rod 10. An annular fixed seal portion 13 is provided, and a movable seal portion 14 is provided which protrudes from the rear outer periphery of the piston rod 10 and whose outer peripheral edge is slidably fitted tightly on the inner surface of the cylinder. A closed air chamber R is formed therebetween, and when the pressing member 11 is moved rearward by the trigger operation, the movable seal portion 14 moves forward due to the negative pressure of the expanded air chamber R, and the trigger is activated. It is configured to return to the original state.

In this embodiment, an annular fixing member 15 which is formed of a relatively hard material such as synthetic resin at the tip portion inside the cylinder 6 and whose inner diameter does not contact the outer surface of the piston rod 10 is fitted. Attached and fixed, while fixing the front surface to the rear surface of this fixing member 15 via the uneven engagement means,
An annular fixed seal portion 13 made of a relatively flexible and highly elastic material such as an elastomer
Make the inner surface airtight and tight, and
10 It is configured to fit airtightly and slidably on the inner peripheral surface.

The size of the air chamber R before or after the movable seal portion 14 is changed may be appropriately selected according to various conditions such as the size of the entire pump and the viscosity of the stored liquid. Incidentally, if the size of the movable seal portion 14 of the air chamber R before the displacement is large, the pressurizing member 11 and the trigger 12 can be easily moved, and the return force may be small. In the case of this embodiment, a concave portion 16 is provided at the center of the front surface of the movable seal portion 14.
And the front surface of the movable seal portion 14 is locked in contact with the rear surface of the fixed seal portion 13. When the air chamber R is in the minimum state, the amount of air in the air chamber is the amount of air existing in the recess 16. And Further, in the present embodiment, the movable seal portion 14 is also used as the annular piston 9.

When the trigger 12 is pulled forward from the state shown in FIG. 1, the pressurizing member 11 moves rearward while the air chamber R is expanded, and then the pressing of the trigger 12 is released.
The movable seal portion 14 moves forward due to the negative pressure air chamber R, and the pressurizing member 11 moves forward accordingly.
12 is configured to return to the original state.

In this embodiment, a specially constructed outside air introduction passage is provided to prevent the negative pressure inside the container from being reduced, and even if the container on which the pump is mounted is accidentally turned down when not in use, the outside air introduction passage is provided. The liquid is prevented from leaking from the container.

This outside air introduction passage is provided with the piston rod 10
Is formed in a cylindrical shape with front and rear end openings, and the inner surface of the piston rod 10 is slidably tightly fitted on the outer surface of the auxiliary cylinder 17 projecting forward in a double cylindrical shape from the front surface of the vertical tube 5 inside the cylinder 6, and A sealing rod 19 having a bulging portion 18 formed on the outer periphery of the front thereof protrudes from the front surface of the vertical cylinder 5 at the center of the auxiliary cylinder 17 into the front piston rod. The inner peripheral edge of the protruding seal plate portion 20 is hermetically contacted with the outer surface of the bulging portion 18 to form a sealing portion B which is opened when the piston rod shifts rearward. One end is opened in the front of the container, and a passage 21 is opened through the inner wall of the vertical cylinder 5 to open above the neck of the container body, the other end of which is mounted. Outside air passage leading to the opening of the piston rod 10 Constitute Te.

Hereinafter, other portions in the above embodiment will be described. The upper end of the pipe 22 is fitted in the lower end opening of the vertical cylinder 5, and the lower end is hung down in the lower part of the container. The cylindrical wall of the vertical cylinder 5 between the cylinder 6 and the auxiliary cylinder 17 and the cylindrical wall of the vertical cylinder 5 at the base end of the injection cylinder 7 have respective communication holes.
23 and 24 are connected, and the inside of the container body 2 and the inside of the vertical cylinder 5 are communicated with each other through a pipe, the communication between the vertical cylinder 5 and the cylinder 6 is made through a communication hole 23, and further, through the communication hole 24. Thus, the inside of the vertical cylinder 5 and the inside of the injection cylinder 7 are communicated with each other, so that a liquid flow path from the inside of the container to the ejection port 25 at the tip of the injection cylinder 7 is formed. In addition, a suction valve 26 is provided in the lower part of the vertical cylinder 5 located upstream in the cylinder 6, and a discharge valve 27 is provided in an upper part of the vertical cylinder 5 located downstream in the cylinder 6.

The trigger 12 in this embodiment has side plates extending rearward from both side edges of the front plate, and upper inner surfaces of the respective side plates are rotatably mounted on the front sides of the piston rod 10 so as to be rotatable. Although cooperating with the pressure member 11, the cooperation means is not limited to this, and the trigger 12 and the distal end of the piston rod 10 may be abutted and locked so that the pressing member 11 can be pushed in when the trigger 12 is pulled. .

In the case of using the pump constructed as described above, when the trigger 12 is pulled forward, the pressurizing member 11 shifts backward, the liquid in the cylinder 6 is pressurized, the discharge valve 27 is opened and the injection is opened. It is ejected from the ejection port at the tip through the cylinder 7. At this time, the air chamber R is expanded, and the seal plate portion 20 also moves rearward, so that the seal between the bulge portion 18 is released and the inside of the container and the outside are separated through the above-described outside air introduction path. Communicate. Next, when the pressing of the trigger 12 is released, the movable seal portion (annular piston 9) moves forward due to the negative pressure in the air chamber R, and the trigger 12 returns to the original state accordingly. At this time, the inside of the cylinder 6 becomes negative pressure because the annular piston 9 moves forward, the discharge valve 27 closes, the suction valve 26 opens, and the liquid in the container body 2 is introduced into the cylinder 6 via the pipe. Further, at this time, outside air is introduced into the container body which becomes negative pressure due to the decrease of the liquid via the outside air introduction path, and when the pressing member 11 moves to the most advanced position, the seal plate portion 20 is moved. The inside and outside of the container are shut off closely to the bulging portion 18.

The above-mentioned members can all be formed by using a synthetic resin, and can be formed by using an elastomer or the like, if necessary.

[0020]

As described above, in the trigger type liquid jet pump according to the present invention, the outer peripheral edge is tightly fixed to the front part inside the cylinder 6 and the inner peripheral edge is closely slidably fitted to the outer surface of the piston rod 10. An annular fixed seal portion 13 is provided, and a movable seal portion 14 is provided which protrudes from the outer periphery of the rear portion of the piston rod 10 and whose outer peripheral edge is closely slidably fitted to the inner surface of the cylinder. When the pressurizing member 11 is moved backward by the trigger operation, the movable seal portion moves forward due to the negative pressure of the expanded air chamber R, and the trigger remains in the original state. Since it is configured so as to return to the above, without using a metal coil spring like a conventional pump of this type, the whole can be formed of a material such as a synthetic resin or an elastomer which does not need to be separated from the pump body, Moreover, Superior in returning ability of member and the trigger are those capable of exhibiting a smooth pump function.

In addition, it has the advantage that it can be formed without increasing the special size as compared with a conventional pump of this type.

Further, the piston rod 10 is formed in a cylindrical shape with front and rear end openings, and the vertical cylinder 5 in the cylinder 6 is formed.
The inner surface of the piston rod 10 is slidably fitted tightly on the outer surface of the auxiliary cylinder 17 protruding forward from the front surface, and the bulging portion 18 is formed on the outer periphery of the front cylinder from the front surface of the vertical cylinder 5 in the auxiliary cylinder 17 into the front piston rod. The seal rod 19 is formed so as to protrude, and an inner peripheral edge of a seal plate portion 20 protruding in a flange shape from the inner surface of the front part of the piston rod 10 is brought into air-tight contact with the outer surface of the bulge portion 18 so as to form a piston rod. A seal portion B that is opened at the time of rearward transition is formed, and one end is opened at the front surface of the vertical cylinder 5 in the auxiliary cylinder 17, and the other end is mounted above the mouth and neck of the container through the inside of the cylinder wall of the vertical cylinder 5. A passage 21 that opens is provided.
In this case, the outside air introduction path is provided to the opening of the tip of the piston rod 10 through the inside of the auxiliary cylinder 17 and the seal portion B. Even if the container is accidentally knocked down, it is possible to prevent the liquid from leaking out of the container, and by using it together with the structure of the return mechanism, it is possible to form the whole compact without requiring any special space. Things.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a trigger type liquid ejection pump according to the present invention.

FIG. 2 is a longitudinal sectional view showing a state where a trigger of the embodiment is pulled.

[Explanation of symbols]

2 ... container body, 3 ... mouth and neck, 4 ... mounting cap, 5 ... vertical cylinder, 6 ... cylinder, 7 ... injection cylinder, 8 ... pump body, 9 ...
Annular piston, 10… Piston rod, 11… Pressurizing member, 12
… Trigger, 13… Fixed seal part, 14… Movable seal part, 17
... Auxiliary cylinder, 18 ... Swelling part, 19 ... Seal rod, 20 ... Seal plate part, 21 ... Path, 25 ... Squirt port, R ... Air chamber

Claims (2)

[Claims] 1. A mounting cap 4 fitted to the mouth and neck of a container body.
And a cylinder 6 which is fitted and fixed on the mounting cap,
A pump body 8 having an injection cylinder 7 projecting forward from the upper part thereof, and a piston having an annular piston 9 having an outer peripheral edge slidably fitted on the inner surface of the cylinder and projecting from the rear outer periphery. A pressurizing member 11 provided so that the tip of the rod 10 can be pushed forward by pushing it forward of the cylinder 6, and an upper part is pivotally attached to the front part of the injection cylinder so as to hang down, and the front part of the piston rod 10 is attached to the upper part. A trigger type liquid ejection pump which is provided with an associated trigger 12 so that the operation of the trigger sucks up the liquid in the container and ejects the liquid from the front end of the injection cylinder 7. And an annular fixed seal portion 13 whose inner peripheral edge is slidably tightly fitted to the outer surface of the piston rod 10, and which protrudes from the outer periphery of the rear portion of the piston rod 10 and whose outer peripheral edge is the inner surface of the cylinder. A movable seal portion 14 slidably fitted tightly is provided to form a sealed air chamber R between the seal portions 13 and 14, and when the pressing member 11 is moved backward by a trigger operation, A trigger type liquid ejection pump characterized in that the movable seal portion (14) moves forward due to a negative pressure in the expanded air chamber (R) and the trigger is returned to the original state. 2. The piston rod 10 is formed in a tubular shape with front and rear end openings, and the inner surface of the piston rod 10 is slid on the outer surface of an auxiliary cylinder 17 projecting from the front surface of the vertical cylinder 5 inside the cylinder 6 to the front double cylinder shape. A seal rod 19 having a bulging portion 18 formed on the outer periphery of the front thereof protrudes from the front surface of the vertical cylinder 5 at the center of the auxiliary cylinder 17 into the front piston rod. (10) The inner peripheral edge of the seal plate portion (20) protruding in a flange shape from the front inner surface is airtightly brought into contact with the outer surface of the bulging portion (18) to form a seal portion (B) that opens when the piston rod moves rearward, and One end is opened at the front surface of the vertical cylinder 5 inside 17 and a passage 21 is opened through the inside of the cylinder wall of the vertical cylinder 5 to open above the mouth and neck of the container body, the other end of which is mounted. Piston rod 10 tip open through seal B 2. The trigger type liquid ejection pump according to claim 1, further comprising an outside air introduction passage leading to a mouth.