JPH10396A - Triggered liquid ejector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the amt. of liq. remaining in a discharge passage between a delivery valve and the tip of a nozzle hole as small as possible when the delivery valve is closed and to prevent the dripping from a nozzle cylinder when the liq. has been ejected by positioning the delivery valve close to the nozzle cylinder to be inserted into the front end of an injection cylinder. SOLUTION: A large-inner-diameter part 31a is formed at the first half of the injection cylinder hole 31 of a triggered liq. ejector and a small-inner- diameter part 31b at the second half, and a valve hole 33 is bored in an end plate 32 to close the front end face of the injection cylinder hole. Further, the small-diameter cylindrical piston 34b at the rear end of the cylindrical piston 34 as a sliding member 36 for projecting a valve rod 35 from the piston 34 and a large-diameter cylindrical piston 34a at the front end are slidably energized forward respectively in the small-inner-diameter part 31b and in the large- inner-diameter part 31a to insert the member into the cylinder hole 31, and a delivery valve 37 is formed by the front end of the valve rod 35 and the valve hole 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trigger type liquid ejector.

[0002]

2. Description of the Related Art A mounting cylinder to be fitted to the mouth and neck of a container body is attached to the lower end of an upright cylinder, and a cylinder is projected forward from an intermediate portion of the upright cylinder and an injection cylinder from an upper end thereof, and is inserted into the cylinder. The fitted plunger front part is engaged with a trigger that has an upper end pivotally attached to the front part of the injection cylinder and hangs down. The trigger operation sucks the liquid in the container into the cylinder via a suction valve, and 2. Description of the Related Art A trigger type liquid ejector provided to eject an inner liquid from a nozzle tube fitted to a front end of an injection tube via a discharge valve is widely used.

[0003] Usually, the discharge valve is provided at the upper end of the upright cylinder, which increases the distance from the discharge valve to the nozzle cylinder. It takes time for the liquid remaining in the injection cylinder to flow out, so that the so-called liquid shortage is poor, and liquid dripping from the nozzle cylinder tends to occur.

In order to eliminate such drawbacks, the present applicant, as shown in Japanese Utility Model Application Laid-Open No. 4-17855, makes the front part of the injection cylinder hole a larger inside diameter hole than the rear part, and inserts the rear part into the large inside diameter hole. The front end face of the injection hole is closed by the urged and fitted valve body to form a discharge valve. When the plunger reaches the latter limit, the residual pressure in the cylinder is discharged into the container, and the discharge valve is securely closed.

[0005]

In the case of Japanese Utility Model Laid-Open No. 4-17855, a coil spring for urging the valve body rearward is mounted in the large bore hole. In addition, a distance corresponding to the length of the coil spring is formed between the discharge valve and the nozzle cylinder, so that the improvement of the liquid shortage and the prevention of the liquid dripping may be insufficient.

In the injector according to the first aspect of the present invention, a valve hole is provided at the front end of the injection cylinder, the valve hole is closed by the front end of the valve rod urged forward, and the pressure in the injection cylinder hole is increased. The valve stem is retracted and the discharge valve is opened, and the high pressure state is eliminated so that the valve stem is advanced again to seal the valve hole, and the distance between the discharge valve and the front end of the nozzle hole is shortened. It is provided so as to be able to prevent liquid dripping and to prevent liquid dripping.

In the case of the ejector according to the second aspect, the ejector according to the first aspect has the problem to be solved, and the sliding member with the valve rod slides easily in the injection cylinder hole. It is provided as follows.

[0008] In the case of the ejector according to the third aspect, the ejector according to the first or second aspect has the problems and
The member for biasing the sliding member with the valve rod forward is formed of an elastic member made of synthetic resin, which projects forward from the bellows-like elastic cylinder front end with a cylindrical portion, so that the forward biasing of the sliding member is easy, and The elastic member is provided so as to be easily mounted in the injection cylinder.

[0009]

As a first means, a mounting cylinder 1 fitted to the mouth and neck of a container body is attached to the lower end of an upright cylinder 2 and a cylinder 3 is inserted from an intermediate portion of the upright cylinder. The injection cylinder 4 projects forward from the upper end, and the front part of the hollow plunger 7 fitted into the cylinder is engaged with the trigger 6 which has the upper end pivotally attached to the injection cylinder and hangs down. A trigger type liquid ejector provided to suck a body fluid into a cylinder via a suction valve and to eject the liquid in the cylinder from a nozzle tube 5 fitted to a front end of the injection tube 4 via a discharge valve.

The first half of the cylinder hole 31 of the injection cylinder is made to have a large inner diameter portion 31a.
And the rear half portion is formed in the small inner diameter portion 31b, and the front end face of the injection cylinder hole is sealed with the end plate 32 and communicated with the nozzle cylinder 5 fitted to the front face of the end plate. A valve hole 33 is drilled at the center of the end plate part closing the front end face of the injection cylinder hole,

A sliding member 36 is urged forward into the injection cylinder hole 31 to project the valve stem 35 forward from the cylindrical piston 34.
The small-diameter cylindrical piston 34 formed by the rear end of the cylindrical piston 34
b is slidably fitted in the small bore 31b, and the large-diameter cylindrical piston 34a formed by the front end of the tubular piston is slidably fitted in the large bore 31a. Thus, the discharge valve 37 was formed.

As a second means, the above-mentioned first means is provided, and a small-diameter cylindrical portion 40 projecting rearward from the end plate 32 is fitted in a watertight manner into a front portion of the large-diameter portion 31a of the injection cylinder hole.
The valve rod 35 was slidably inserted into the small-diameter cylindrical portion.

As a third means, there is provided the first or second means, and a member for urging the front of the sliding member 36 is provided by projecting the cylindrical portion 42 from the front end of the bellows-shaped cylinder 41 to the front. An elastic member 43 integrally formed of a material engages the rear end surface of the bellows-shaped tube 41 with the front surface of an inward flange 44 attached to the base end of the injection tube 4 and fits the tube portion 42 to the inner surface of the cylindrical piston 34. And fixed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a general structure of a trigger type liquid ejector will be described. Reference numeral 1 denotes a mounting cylinder portion screwed to a neck of a container body, and the mounting cylinder portion is attached to a lower end of an upright cylinder 2. The cylinder 3 protrudes forward from the middle of the upright cylinder, and the injection cylinder 4 protrudes forward from the upper end. A nozzle cylinder 5 is fitted to the front end of the injection cylinder 4, and the trigger 6 is pivotally mounted to the front part of the injection cylinder 4 so that the trigger 6 hangs down. The front part of the hollow plunger 7 fitted into the cylinder 3 is a trigger 6 To the upper rear surface of the. Normally, the hollow plunger 7 is urged forward by a metal coil spring mounted in the cylinder, and the liquid in the cylinder passes through a discharge valve provided at a position different from that in the illustrated example by the trigger pull, so that the nozzle cylinder 5 It is provided so that the liquid in the container is sucked into the cylinder 3 through a suction valve formed by a ball valve or the like by the return of the trigger, but in the illustrated example, instead of the coil spring, from the lower end of the trigger 6 A leaf spring 9 protrudes upward and rearward through a folded portion 8, and a front end of the leaf spring 9 projects coaxially with the cylinder from the front of the upright cylinder with a small gap between the cylinder and the cylinder. Plunger holding cylinder
Engage into the recess 11 of the front opening provided at the rear of the lower surface of 10,
A tube with a hollow plunger front protruding rearward from the top of the trigger
12 Attached to the rear 13 The hollow plunger may be formed by fitting two members as shown in FIG.

Reference numeral 14 denotes a suction valve, which in the illustrated example is an auxiliary cylinder portion 15 fitted into an upright cylinder 2 that is raised from the top wall of the mounting cylinder section 1.
As shown in FIG. 3, an upper plate 16 is attached to the inner surface of the upper end of the upper end of the plug-shaped member 17 having a cross section in a cross section, and a rod portion stands upright from the center of the upper plate. Line 18
And a valve plate 19 is attached to the lower end of the wire, and an inward flange 20 attached to an inner surface of an intermediate portion between the valve plate and the auxiliary cylinder portion 15.
And formed.

A small-diameter cylinder 21 projects forward from the front wall portion of the upright cylinder 2 surrounded by the cylinder 3 coaxially with the cylinder, a concave groove 22 is formed on the outer periphery of the base end of the small-diameter cylinder, and an upright cylinder surrounded by the small-diameter cylinder. A perforation hole 23 is formed in the front wall portion, and further, the perforation hole 23 and a discharge hole 24 provided in an upright cylinder penetrating portion with respect to the top wall of the mounting cylinder,
They communicate with each other through a groove 25 provided between the upright cylinder 2 and the auxiliary cylinder portion 15, which form a mechanism for discharging the liquid remaining in the cylinder when the hollow plunger 7 is drawn, that is, a residual pressure discharging mechanism.

According to the present invention, the front end face of the cylinder hole 31 of the injection cylinder is closed by an end plate 32, and a valve hole 33 is formed at the center of the end plate portion that closes the cylinder hole. The front half of the hole is formed in the large-diameter portion 31a, and the rear half is formed in the small-diameter portion 31b, and a synthetic resin slide that projects the valve rod 35 forward from the cylindrical piston 34 into the injection cylinder hole 31 is provided. The large-diameter cylindrical piston 34a formed by the front end of the cylindrical piston is
a, and the small-diameter cylindrical piston 34b formed by the rear end of the cylindrical piston is slidably fitted within the small-diameter portion 31b, and the sliding member is biased forward to bias the front end of the valve stem and the valve. The discharge valve 37 was formed with the hole 33. Further, the valve hole and the nozzle hole 5a of the nozzle cylinder 5 fitted to the short rod 38 and the short cylinder 39 projecting forward from the front surface of the end plate 32 were communicated.

As shown in the figure, the valve stem 35 is preferably inserted into a small-diameter cylindrical portion 40 projecting from the rear surface of the end plate and fitted in a watertight manner in the front portion of the large-diameter portion 31a. The front urging is performed by an elastic member 43 integrally formed of a synthetic resin material by projecting a cylindrical portion 42 forward from a front end of the bellows-shaped cylinder 41, and a rear end surface of the bellows-shaped cylinder 41 is attached to a base end of the injection cylinder 4. Engage to the front of the inward flange 44, and fit the cylindrical portion 42 to the inner surface of the cylindrical piston 34,
It is done by sticking.

The trigger 6 is operated several times from the state in which the liquid ejector is mounted on the mouth and neck of the container body and the lid plate 5b which is pivotally attached to the upper front end of the nozzle cylinder 5 and closes the nozzle hole 5a is opened. Then, when the liquid in the container is put into the cylinder 3 and the injection cylinder hole 31 and the trigger 6 is pulled, the pressure in the cylinder 3 and the pressure in the injection cylinder hole are increased. Then, the sliding member 36 retreats against the urging of the bellows-shaped cylinder 41 due to the difference in pressure receiving area due to the diameter difference between the large-diameter cylindrical piston 34a and the small-diameter cylindrical piston 34b of the cylindrical piston 34. The discharge valve 37 is opened, and the liquid is ejected from the nozzle hole 5a. The inner peripheral edge of the rear end of the hollow plunger 7 by the pulling of the trigger 6 becomes the concave groove 22 on the outer periphery of the base end of the small-diameter cylinder 21.
When entering the inside of the small-diameter cylinder 21 through the concave groove and between the outer surface of the small-diameter cylinder 21 and the inner surface of the rear cylinder wall of the hollow plunger 7,
Further, from the inside of the small-diameter cylinder 21, the residual pressure discharging mechanism described above,
3. The residual pressure in the injection cylinder hole 31 and the cylinder is discharged into the container through the groove 25 and the discharge hole 24.

[0020]

According to the present invention, the liquid ejector according to the first aspect of the present invention has a pressure receiving area difference due to a diameter difference between the large-diameter cylindrical piston 34a and the small-diameter cylindrical piston 34b. Since the cylindrical piston 34 having both pistons is retracted against the forward bias when the pressure in the injection cylinder hole is increased, the valve hole formed in the end plate 32 for closing the front end face of the injection cylinder hole is provided. 33
And the front end of the valve rod 35, the discharge valve 37 can be formed.Therefore, the distance between the nozzle hole 5a of the nozzle cylinder fitted to the front surface of the end plate and the discharge valve 37 is made wider than before. By narrowing and minimizing the amount of liquid remaining in the liquid outflow path between the distances, dripping from the nozzle hole can be prevented.

According to the second aspect of the present invention, there is provided the liquid ejector according to the first aspect.
In addition to the effects of the liquid ejector described above, the small-diameter cylindrical portion 40 projecting rearward from the end plate 32 is fitted into the front portion of the large-diameter portion 31a formed by the front half of the injection cylinder hole, and the small-diameter cylindrical portion 40 is formed. Since the valve stem 35 is slidably inserted into the inside, even if the diameter of the valve stem 35 is reduced to reduce the weight, the valve stem does not rattle in the small-diameter cylindrical portion 40, and the sliding is performed smoothly. I can make it.

According to a third aspect of the present invention, the liquid ejector has the same effects as those of the first and second aspects of the present invention. The bellows-like rear end face is engaged with the front face of an inward flange 44 attached to the base end of the injection cylinder by an elastic member 43 projecting forward, and
The elastic member 43 does not directly contact the small-diameter cylindrical piston 34b formed by the rear end of the cylindrical piston because the 42 is fitted to the inner surface of the cylindrical piston 34, that is, the action of the small-diameter cylindrical piston is hindered. Without this, there is an effect that the sliding member 36 can be urged forward, and since the elastic member has a substantially long cylindrical shape, it can be easily mounted in the injection cylinder hole.

[Brief description of the drawings]

FIG. 1 is a sectional view of a liquid ejector according to the present invention.

FIG. 2 is an exploded perspective view of a hollow plunger used in the liquid ejector of FIG.

FIG. 3 is a perspective view of a valve member for forming a suction valve used in the liquid ejector of FIG. 1;

FIG. 4 is a perspective view of a discharge valve forming sliding member used in the liquid ejector of FIG. 1;

5 is a perspective view of the elastic member for urging the front of the sliding member used in the liquid ejector of FIG. 1;

[Explanation of symbols]

 4 injection cylinder 31 injection cylinder hole 34 cylindrical piston 36 sliding member 41 bellows-shaped cylinder 43 elastic member

Claims (3)

[Claims] 1. A mounting cylinder 1 fitted to the mouth and neck of a container body is attached to a lower end of an upright cylinder 2, and a cylinder 3 is protruded forward from an intermediate portion of the upright cylinder and an injection cylinder 4 is protruded from an upper end thereof. Hollow plunger 7 fitted into the cylinder
The front part is engaged with a trigger 6 having the upper end pivotally attached to the above-mentioned injection cylinder and hanging therefrom. The trigger operation causes the liquid in the container to be sucked into the cylinder via the suction valve, and the liquid in the cylinder to be discharged to the discharge valve. In the trigger type liquid ejector provided so as to eject from the nozzle cylinder 5 fitted to the front end of the injection cylinder 4 through the middle, the front half of the cylinder hole 31 of the injection cylinder is in the large inner diameter portion 31a, and the rear half is in the small internal diameter portion. 31b, the front end face of the injection cylinder hole is sealed with an end plate 32 and communicated with the nozzle cylinder 5 fitted to the front face of the end plate to close the front end face of the injection cylinder hole. A valve hole 33 is formed at the center of the plate portion, and the valve hole 33 is urged forward into the injection cylinder hole 31 so that a cylindrical piston 34 is formed.
A small-diameter cylindrical piston 34b formed by the rear end of the cylindrical piston 34 has a small-diameter portion 31.
b, and a large-diameter cylindrical piston 34a formed by the front end of the cylindrical piston is slidably fitted in the large-diameter portion 31a, and a discharge valve 37 is formed by the front end of the valve rod 35 and the valve hole 33. A trigger-type liquid ejector characterized by forming: 2. A small-diameter cylindrical portion 40 projecting rearward from an end plate 32 is fitted in a watertight manner into a front portion of a large-diameter portion 31a of an injection cylinder hole, and a valve rod 35 is slidably inserted into the small-diameter cylindrical portion. The trigger type liquid ejector according to claim 1, wherein the trigger type liquid ejector is inserted. 3. An elastic member 43 integrally formed of a synthetic resin material with a cylindrical member 42 projecting forward from the front end of a bellows-shaped cylinder 41, and a member for biasing the front of the sliding member 36 is formed behind the bellows-shaped cylinder 41. Injection cylinder 4 at end face
The trigger type according to claim 1 or 2, wherein the trigger type is formed by engaging with a front surface of an inward flange 44 provided at a base end of the cylindrical piston 34 and fitting and fixing the cylindrical portion 42 to an inner surface of the cylindrical piston 34. Liquid ejector.