JP4366512B2 - Trigger type pump dispenser - Google Patents

Description

The present invention relates to a trigger-type pump dispenser in which a nozzle portion does not move up and down and is easily determined when jetting.
More specifically, in a trigger-type pump dispenser that slides the piston member up and down and injects the liquid in the cylinder from the nozzle part to the outside, the liquid is accurately hit the target position without any vertical movement of the nozzle part. The present invention relates to a trigger type pump dispenser that can be made simple and has a simple structure.

Conventionally, a trigger type pump dispenser has been used as means for injecting a liquid such as a chemical solution to a predetermined portion.
This pump dispenser is useful because it has the advantage that the piston moves only by operating the trigger structure and the liquid in the container communicating with the cylinder can be easily ejected from the nozzle.

  In a trigger-type pump dispenser having such a trigger structure (see, for example, Patent Document 1 and Patent Document 2), generally, an operation of grasping the dispenser body, setting a direction to a position to be an injection target, and drawing the trigger structure (that is, Rotation operation).

Then, by pulling the trigger structure, a part thereof pushes down the head of the piston part.
Then, the piston part is lowered and the liquid in the cylinder is compressed. As a result, the liquid is ejected from the nozzle to the outside.

In this case, since the piston portion and the nozzle are connected, naturally, the nozzle is lowered integrally with the lowering of the piston. Since such a movement occurs during the injection, the injection locus becomes a continuous linear shape.
In such a structure in which the nozzle portion moves up and down, since the target is not determined at the location where the nozzle is to be sprayed, the ejected liquid does not reach the exact location.

In order to solve such problems, a trigger type pump dispenser having a structure in which the nozzle portion does not move up and down has been developed (Patent Document 1).
However, this trigger type pump dispenser does not transmit the movement of the trigger structure directly to the piston.
That is, since the trigger structure transmits the movement to the piston via the swing lever, the structure is complicated and the force transmission efficiency is poor from the viewpoint of frictional force.
In addition, since the number of parts is large, the number of assembling steps increases, and failure is likely to occur.

Japanese Patent Laid-Open No. 10-43648

The present invention has been made on the basis of such a background art and has been made to overcome the above technical problems.
That is, an object of the present invention is to provide a pump dispenser in which the nozzle does not move and the structure is simple even if the trigger pump dispenser has a structure in which the piston is pushed down by the trigger structure.

  Thus, as a result of earnest research on the background of such problems, the present inventor absorbs the vertical movement of the piston by bending and deforming the portion between the nozzle and the moving piston. The present invention has been completed based on this finding.

That is, the present invention includes (1) a base body having a cap attached to the mouth portion of the container body, a cylinder portion engaged with the cap, and a cover member, and a piston portion slidable in the cylinder portion. And a trigger structure that slides the piston portion up and down, and a trigger pump dispenser that slides the piston portion up and down by the rotation of the trigger structure and injects liquid in the cylinder from the nozzle portion to the outside. The nozzle portion is fixed to the cover member, and a bending-deformable connecting portion is provided between the piston portion and the nozzle portion to connect the nozzle portion, the bending-deformable connecting portion, and the piston. parts a piston structure which is integrated the, triggering Pont and absorbs more aggressively bending deformation of the connecting portion in the vertical movement of the piston It resides in the dispenser.

  Further, the present invention is the above (2), wherein the trigger structure is pivotally attached to the base body at the first pivot part and the intermediate position is pivotally attached to the piston member at the second pivot part. It exists in the trigger type pump dispenser as described in 1).

  In the present invention, (3), the ratio of the distance between the first pivot part and the second pivot part and the distance from the position of the first pivot part to the trigger tip of the trigger structure is 1: 4. It exists in the trigger type pump dispenser of the said (2) description above.

  Moreover, this invention exists in the trigger type pump dispenser as described in said (1) which equips the expansion part of the said base main body with the trigger lock which can be rotated to the position which stops a trigger structure. .

  In addition, the present invention provides (5) the trigger type pump dispenser according to (1), wherein a vent hole communicating with the outside air is formed in the wall of the cylinder portion to eliminate the negative pressure in the container body. Exist.

  In the present invention, (6) the first sealing valve for sealing the inside of the cylinder part to the piston part and the second sealing valve below the first sealing valve are formed. In addition, the vent hole of the cylinder part exists in the trigger type pump dispenser according to the above (5), which is located above the first sealing valve at the bottom dead center of the piston part.

  Further, the present invention provides (7) the trigger type according to the above (1), wherein the cylinder portion is provided with a rod-like closing valve that shuts off the pressure in the container by sealing the passage in the piston portion at the top dead center of the piston portion. Exists in pump dispensers.

  Moreover, this invention exists in the trigger type pump dispenser as described in said (1) which formed the vertical groove for liquid escape in the lower part of the said cylinder part inner wall (8).

Moreover, this invention exists in the trigger type pump dispenser of the said (1) description which can be switched to (4) the four liquid injection states in which the said nozzle part includes interruption | blocking.
The present invention also relates to (10) a piston structure used for a trigger type pump dispenser, wherein the piston structure includes a nozzle part, a piston part, and a connecting part that can be bent and deformed. Therefore, the piston structure exists in a piston structure integrally formed by injection molding.

In addition, as long as the objective of this invention is followed, the structure which combined the said (1) to ( 10 ) suitably is also employable.

  The trigger type pump dispenser of the present invention has a nozzle part fixed to a cover member, and a connecting part that can bend and deform between the piston part and the nozzle part to connect the two, and connects the vertical movement of the piston. Since the liquid is positively absorbed by the bending deformation of the part, the liquid can accurately reach the target position without any vertical movement of the nozzle part at the time of liquid injection.

In addition, since it is a structure that absorbs the vertical movement of the piston by bending deformation of the connecting portion, it does not require extra parts, and the structure is simple and there are few failures.

  Also, the trigger is easy because the ratio of the distance between the first pivot part and the second pivot part and the distance from the position of the first pivot part to the trigger tip of the trigger structure is 1: 4 or more. It becomes easy to pull in.

  In addition, since the extended portion of the base body is provided with a trigger lock that can be rotated to a position where the trigger structure is stopped, the trigger is not accidentally pulled in.

In addition, the cylinder wall has a vent hole that leads to the outside air to eliminate the negative pressure in the container body, so that the container body does not shrink and the liquid can be sucked up efficiently. Is called.

  In addition, by providing a rod-like closing valve that shuts off the pressure in the container by sealing the passage in the piston part at the top dead center of the piston part in the cylinder part, the pressure in the container body increases for some reason, and the liquid Even if it flows backward into the cylinder part, it does not leak from the nozzle part.

  In addition, since the vertical groove for liquid escape is formed in the lower part of the inner wall of the cylinder part, the liquid breakage from the injection port is improved.

  In addition, since the nozzle portion can be switched to four liquid injection states including blocking, the degree of freedom in selecting the liquid injection mode increases.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.
FIG.1 and FIG.2 is a figure which shows the trigger type pump dispenser which concerns on one Embodiment of this invention, and has shown the state before pulling the trigger 31, respectively.
As shown in FIG. 2, the trigger type pump dispenser is configured to inject the liquid in the cylinder from the nozzle portion 21 by pulling the trigger 31 which is a part of the trigger structure 3 to slide the piston portion 23 downward. is there.
This trigger type pump dispenser is provided with a cap 4, a base body 1, a trigger structure 3, and a piston structure 2 that are directly attached to a container, and a first valve FV and a second valve SV are provided in a passage constituted by these. ing.
These parts are manufactured mainly by injection molding with synthetic resin.
For example, the cap 4 and the base body 1 are made of PP resin, the trigger structure 3 is made of POM resin, and the piston structure 2 is made of LLDPE resin.

The cap 4 is detachable by screwing or the like into the mouth portion of the container body 7.
A synthetic resin base body 1 is attached to the cap 4.
Since the cap 4 has a tapered portion, the base body 1 can be easily fixed to the cap 4 with one touch by strongly pressing the lower end of the base body 1 into the hole of the cap 4.

The base body 1 includes a hollow cylindrical cylinder portion 11 that can accommodate a piston portion 23 to be described later, and a cover member 12 that is hinged to the cylinder portion 11.
And the cylinder part 11 is provided with the part extended outside from it, ie, the expansion part 11A, and when the pump dispenser is grasped at the back of the expansion part 11A, the base of the thumb abuts here and supports its weight. be able to.

In addition, a trigger lock 5 for locking the movement of the trigger 31 is provided in front of the extension portion 11A.
The trigger lock 5 includes a blocking piece 51 and can be rotated to a position where the trigger 31 is stopped.
The blocking piece 51 blocks the movement of the trigger 31 at this stop position.

3A and 3B are views for explaining the trigger lock 5, wherein FIG. 3A is a plan view and FIG. 3B is a front view.
4 is a diagram for explaining a state in which the trigger lock 5 is rotated from the state of FIG. 3 to the stop position of the trigger 31. (A) is a plan view and (B) is a front view.
The engagement protrusion 52 of the trigger lock 5 is engaged with and attached to the cylindrical portion 11 </ b> B rising from the base body 1.

A cylinder portion 11C having a smaller diameter is formed under the cylinder portion 11 which is a part of the base body 1, and the cylinder portion 11C is provided with a first valve FV (a valve with a spring).
The liquid in the container passes through the first valve FV and is sucked into the cylinder part 11.
In addition, an introduction tube that sucks up the liquid at the bottom of the container and introduces it into the first valve FV (valve with spring) is mounted below the cylindrical portion 11B.
In the cylinder part 11, a two-stage hollow cylindrical piston part 23 having a small-diameter part 23 </ b> A at the upper part is slidably provided. The piston part 23 is a part of the piston structure 2.

FIG. 5 is a side view showing the piston structure 2.
The piston structure 2 integrally has a nozzle portion 21 and a connecting portion 22 that connects the nozzle portion 21 and the piston portion 23 at the tip.
The nozzle portion 21 is fixed in front of the cover member 12 described above, and is restricted from moving with the movement of the piston portion 23.
That is, the protrusion 21 </ b> A at the upper end of the nozzle 21 is engaged with the engagement hole 12 </ b> A of the cover member 12, so that the nozzle 21 is fixed and does not move up and down.
The nozzle portion 21 is provided with a second valve SV (spring valve), and the liquid in the container is finally discharged outward through the second valve SV.

The nozzle unit 21 has four functions of SPRAY, OFF, JET, and NARROW.
That is, by switching the nozzle N that is externally inserted at the tip of the nozzle portion 21, it is possible to switch to four liquid ejection states including blocking (4-way nozzle).
Further, the connecting portion 22 which is a part of the piston structure 2 described above can be bent and deformed, and as described in detail later, an important role of positively absorbing the vertical movement of the piston by bending deformation. Fulfill.

On the other hand, the trigger structure 3 has a bifurcated portion 32 extending from the trigger 31 and a spring portion 33, and the bifurcated portion 32 is attached to the base body 1 and the piston portion 23, and the spring portion 33 is attached to the base body 1. Holding fixed.
FIG. 6 is a side view showing the trigger structure.
Specifically, the trigger structure 3 is pivotally attached to the base body 1 and the piston portion 23 at the end portion and intermediate position of the bifurcated portion 32, respectively.
That is, a circular protrusion 32B is formed at the tip of the bifurcated portion 32 of the trigger structure 3, and the circular protrusion 32B is fitted into the hole 11A1 formed in the standing wall portion of the base body 1 so that the first pivot portion P1.

Further, a pair of circular protrusions 23A1 are formed on the side wall of the small-diameter portion 23A that is the upper portion of the piston portion 23, and the bifurcated portion 32 of the trigger structure 3 is disposed so as to sandwich the small-diameter portion 23A. Yes.
The circular protrusion 23A1 is fitted into a circular hole 32A formed at an intermediate position of the bifurcated portion 32, thereby forming the second pivotally attached portion P2.
Here, the ratio of the distance L1 between the first pivot part P1 and the second pivot part P2 and the distance L2 from the position of the first pivot part P1 to the tip of the trigger 31 (that is, the “leverage ratio”) is 1 : It is preferable that it is 4 or more.

Incidentally, the conventional trigger type pump dispenser fixed by the nozzle N has a structure that transmits the movement of the trigger to the piston through the swing lever, so it is difficult to make such a “leverage ratio” because of its structure. It was.
The reason why the lever ratio could be 1: 4 or more was that the second pivot part P2 as in the present invention was installed on the side surface of the piston so that it could be straightened and shortened with the first pivot part P1. It is.
The reason why the “leverage ratio” is shown based on the position of the tip of the trigger 31 is that when the length of the trigger 31 is set, the positions where the index finger and the middle finger are hooked tend to be determined.

Further, when the spring portion 33 of the trigger structure 3 is gripped by the trigger 31 and rotated with the first pivotally attached portion P1 as a starting point, the distance between the two is reduced and the spring force 33 exerts a resilience in the opposite direction.
That is, the tip of the spring portion 33 of the trigger structure 3 is fitted and held and fixed to the step portion of the base body 1, and when the trigger 31 is gripped and pulled, the angle formed by the trigger 31 and the spring portion 33 is reduced. When the finger is released, the trigger 31 returns to its original position.

By the way, the piston part 23 is formed with an upper first sealing valve 23B1 for sealing the inside of the cylinder part 11 and a second sealing valve 23B2 below the first sealing valve 23B1.
Due to the action of the first sealing valve 23B1 and the second sealing valve 23B2 of the piston portion 23, the outside air P and the inside of the container body are in communication and non-communication with each other via the vent hole S2, as will be described later. Can be switched to.

The wall of the cylinder part 11 is provided with a vent hole S2, and a vent channel for introducing the outside air P into the container body is formed as indicated by an arrow.
When the first sealing valve 23B1 of the piston portion 23 slides against the cylinder portion 11, the ventilation passage is blocked or opened.

By the way, in the state before injecting the liquid in the container main body 7, the height position of the vent hole S2 of the cylinder part 11 is between the first sealing valve 23B1 and the second sealing valve 23B2 of the piston part 23. is there.
That is, the second sealing valve 23B2 is formed in order to prevent leakage of the liquid that has been sucked up by the introduction hose and then enters the cylinder portion 11, and prevents the outside air P from communicating through the vent hole S2. Therefore, a first sealing valve 23B1 is formed.
When the trigger 31 is pulled from this state, the liquid in the cylinder part 11 is ejected from the nozzle part 21.

In this case, the piston 23 is pushed down by the trigger structure 3 (specifically, the bifurcated portion 32), and the upper first sealing valve 23B1 moves downward from the vent hole S2 while sliding on the inner wall of the cylinder portion 11. To do.
The outside air P enters the inside of the cylinder part 11 and enters the container body 7 through the vent hole S2, and the negative pressure is eliminated.

When the pressure by the trigger structure 3 is released to return from this state to the original state, the piston part 23 is raised by the urging force of the spring part 33, and the liquid in the container body 7 rises via the introduction hose and the cylinder part 11 The inside space (of course, the inside of the piston portion) is filled.
Finally, the first sealing valve 23B1 moves above the vent hole S2, the flow of the outside air P is blocked, and the original state is restored.

FIG. 7 shows the pump dispenser described so far provided with means for preventing liquid leakage from the nozzle portion 21.
A rod-like closing valve 6 is erected on the bottom of the cylinder portion 11 and enters the small diameter portion 23 </ b> A of the piston portion 23.
When the cylinder part 11 is at the top dead center (corresponding to the position before the trigger 31 is retracted), the expansion part 61 at the end of the closing valve 6 is pressed against the inner wall of the small diameter part 23A to close the liquid passage. The
Therefore, when the nozzle portion 21 is in the open position, even if the internal pressure of the container increases and the liquid rises through the first valve FV in this state, there is an effect that the nozzle portion 21 does not escape.

Further, a vertical groove S1 for liquid escape is formed in the lower part of the inner wall of the cylinder part 11.
This is because there is no vertical groove S1 in the past, and when the cylinder portion 11 approaches the bottom dead center (corresponding to the position where the trigger 31 is pulled off), the pressure decreases and the momentum of the liquid from the injection port N1 gradually decreases. “Cut” gets worse.
However, if the longitudinal groove S1 is present as in the present invention, the liquid escapes through the longitudinal groove S1, so that the pressure in the cylinder decreases at once (that is, the pressure escapes from the vent hole S2 formed in the cylinder wall). Will stop.
That is, the “cut” is improved.

Here, the operation of the piston structure 2 will be described in detail in order to show the function of the connecting portion 22 which is an important part of the present invention.
Now, when the trigger 31 of the trigger structure 3 is drawn in order to inject liquid to a predetermined place, the trigger structure 3 rotates with respect to the first pivotally attached portion P1.
Since the trigger structure 3 is pivotally attached to the piston part 23 by the bifurcated part 32 (second pivot part P2), the piston part 23 is pushed downward by the rotation of the trigger structure 3.
The liquid in the cylinder part 11 is compressed by the downward movement of the piston part 23, reaches the nozzle part 21 through the connecting part 22, and is ejected from the ejection port N <b> 1.
At this time, when the piston portion 23 is pushed down, the nozzle portion 21 integrated therewith is also pulled down. However, as described above, the nozzle portion 21 is not lowered because it is fixed to the cover member 12.
However, here, the connecting portion 22 is bent and deformed to actively absorb the movement of the piston.

Thus, since the nozzle part 21 does not move by the action of the connecting part 22 in the trigger type pump dispenser of the present invention, when the liquid is jetted, it is accurately positioned at the target position without any vertical movement of the jet port N1. Liquid can be jetted.
Moreover, since the apparatus part for preventing the nozzle part 21 from being influenced by the motion of the piston part 23 is unnecessary, a structure becomes simple.
Therefore, the failure rate is reduced and the number of assembly steps is also small.

Although the present invention has been described above, the present invention is not limited to the above-described embodiments, and it goes without saying that various other modifications are possible without departing from the essence thereof. .
For example, in the above-described embodiment, the nozzle portion 21, the piston portion 23, and the connecting portion 22 are integrated as the piston structure 2, but if the connecting portion 22 can be bent and deformed, they are molded and connected as separate components. May be.
In addition, the trigger structure 3 can be attached to the base body 1 at the tip of the spring portion 33 by using appropriate means such as fitting, insertion, and support.
Further, from the viewpoint of bending deformability, the LLDPE resin is used for the piston structure 2, but it is also possible to use an elastomer resin that is more excellent in bending deformability than only the connecting portion.

FIG. 1 is an explanatory view showing a trigger type pump dispenser according to an embodiment of the present invention. FIG. 2 is an explanatory view showing a trigger type pump dispenser according to an embodiment of the present invention. FIGS. 3A and 3B are views for explaining the trigger lock. FIG. 3A is a plan view and FIG. 3B is a front view. 4A and 4B are diagrams for explaining a state in which the trigger lock is rotated from the state of FIG. 3 to the trigger stop position. FIG. 4A is a plan view and FIG. 4B is a front view. FIG. 5 is an explanatory view showing a piston structure in the trigger type pump dispenser of the present invention. FIG. 6 is an explanatory view showing a trigger structure in the trigger type pump dispenser of the present invention. FIG. 7 shows a trigger type pump dispenser provided with means for preventing liquid leakage from the nozzle portion according to another embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Base main body 11 ... Cylinder part 11A ... Expansion part 11A1 ... Hole 11B ... Cylindrical part 11C ... Cylindrical part 12 ... Cover member 12A ... Engagement hole 2 ... Piston structure 21 ... Nozzle part 21A ... Projection piece 22 ... Connection part 23 ... Piston part 23A ... Small diameter part 23A1 ... Circular protrusion 23A2 ... Circular protrusion 23B1 ... First sealing valve 23B2 ... Second sealing valve 3 ... Trigger structure 31 ... Trigger 32 ... Bifurcated part 32B ... Circular protrusion 33 ... Spring part 4 ... Cap 5 ... Trigger lock 51 ... Blocking piece 52 ... Locking projection 6 ... Closing valve 61 ... Expansion portion 7 ... Container body FV ... First valve SV ... Second valve N ... Nozzle N1 ... Injection port S1 ... Vertical groove S2 ... Ventilation Hole P ... Outside air P1 ... First pivot part P2 ... Second pivot part

Claims (10)

A cap attached to the mouth of the container body;
A base body having a cylinder portion and a cover member engaged with the cap;
A piston part slidable in the cylinder part;
A trigger pump dispenser that slides the piston part up and down, and a trigger pump dispenser that slides the piston part up and down by the rotation of the trigger structure and injects the liquid in the cylinder from the nozzle part to the outside;
The nozzle portion is fixed to the cover member, and includes a connecting portion that can be bent and deformed to communicate between the piston portion and the nozzle portion,
A piston structure in which the nozzle part, the bending-deformable connecting part and the piston part are integrated;
A trigger type pump dispenser that positively absorbs the vertical movement of the piston by bending deformation of a connecting portion.   2. The trigger type according to claim 1, wherein an end portion of the trigger structure is pivotally attached to a base body at a first pivot portion, and an intermediate position is pivotally attached to a piston member at a second pivot portion. Pump dispenser.   The ratio between the distance between the first pivot part and the second pivot part and the distance from the position of the first pivot part to the trigger tip of the trigger structure is 1: 4 or more. 2. The trigger type pump dispenser according to 2.   The trigger-type pump dispenser according to claim 1, wherein a trigger lock that can be rotated to a position where the trigger structure is stopped is provided in the extended portion of the base body.   The trigger type pump dispenser according to claim 1, wherein a vent hole communicating with outside air for eliminating negative pressure in the container body is formed in the wall of the cylinder portion.   A first sealing valve for sealing the inside of the cylinder part to the piston part and a second sealing valve below the first sealing valve are formed, and the vent hole of the cylinder part is 6. The trigger type pump dispenser according to claim 5, wherein the piston part is located above the first sealing valve at a bottom dead center of the piston part.   2. The trigger type pump dispenser according to claim 1, wherein a rod-shaped closing valve is provided in the cylinder portion to seal the passage in the piston portion at the top dead center of the piston portion to block the pressure in the container.   2. A trigger type pump dispenser according to claim 1, wherein a longitudinal groove for liquid escape is formed in a lower portion of the inner wall of the cylinder portion.   The trigger type pump dispenser according to claim 1, wherein the nozzle portion can be switched to four liquid injection states including blocking. A piston structure used in a trigger type pump dispenser, the piston structure comprising a nozzle part, a piston part, and a connecting part that can be bent and deformed, and the piston structure is formed by injection molding. A piston structure characterized by being integrally molded.

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