JP5882106B2 - Metered syringe type ejector - Google Patents

Description

  The present invention relates to a quantitative syringe type ejector including a syringe having a flange portion and a plunger that can be pushed into the syringe, and relates to a technique for pushing the plunger in stages.

  Some syringe-type ejectors, for example, push a plunger into a syringe and take out contents such as a chemical solution (see, for example, Patent Document 1).

JP 7-213612 A

  However, since the conventional syringe-type ejector only pushes the plunger into the syringe, it is difficult to divide the contents into small portions and eject them.

  An object of the present invention is to provide a novel metering syringe type ejector that can divide the contents and eject them.

The present invention is a metering syringe type ejector comprising a syringe having a flange portion and a plunger that can be pushed into the syringe,
The plunger has a first shaft member having a piston at the tip, and a second shaft member disposed at the rear end of the first shaft member,
The first shaft member is integrally provided with at least one elastic piece extending backward, and can enter the elastic piece from the rear end opening of the syringe and slide on the inner peripheral surface of the syringe. Sliding protrusions and locking protrusions that are locked to the rear end of the syringe are provided, and the second shaft member has an end surface that presses the free end of the elastic piece, and is pressed by the end surface. By restraining the free end of the elastic piece with the syringe, the elastic piece is caused to bend and deform from the sliding protrusion, and the locking protrusion is locked to the rear end of the syringe. the relaxation state, and are not to release the engagement of the locking projection by the restoring force that starting from the slide projection of the bending deformation, by the release of the locking of the locking projection, the plunger further be pushed into the syringe what Oh characterized by Rukoto A.

Wherein the first shaft member, and a space for receiving the second shaft member, and the locking portion is provided for holding retaining the second shaft member, said space, when the relaxation of the pressing and the pressing the second shaft member can it to form so as to be movable in the first shaft member.

  In addition, a step is provided at the free end of the elastic piece, and the bottom surface of the step is formed on the pressure receiving surface from the second shaft member, and the side surface of the step is formed as a tapered surface that allows the free end side of the elastic piece to escape. be able to. Also, the free end of the elastic piece can be tapered. Further, a tapered surface corresponding to the first shaft member can be formed on the second shaft member. According to the present invention, a spray nozzle can be provided at the tip of the syringe.

  In the present invention, when the second shaft member is pushed in, the sliding protrusion provided on the elastic piece enters from the rear end opening of the syringe and slides on the inner peripheral surface of the syringe, and is provided on the first shaft member. When the movement of the free end of the elastic piece is restrained between the elastic piece and the syringe, the elastic piece is bent and deformed starting from the sliding protrusion. Therefore, the first ejection can be performed until the locking projection provided on the elastic piece is locked to the rear end of the syringe.

  Next, when the pushing of the second shaft member is loosened, the free end side of the elastic piece restores from the sliding projection as a starting point by the restoring force starting from the bending projection of the sliding projection. At this time, since the fixed end side of the elastic piece remains deformed inward from the sliding protrusion, the free end side of the elastic piece is aligned with the fixed end side deformed inward from the sliding protrusion. Restore diagonally inward. For this reason, the latching protrusion is also released obliquely inward so as to follow the free end side of the elastic piece, whereby the latching of the latching protrusion is released. Thereby, if the plunger is pushed in again, the second ejection becomes possible.

  Therefore, according to the present invention, the contents can be taken out in small portions. In addition, in the present invention, since the second ejection can be performed only by loosening the pushing of the second shaft member, it is not necessary to change the second shaft member when carrying out the second ejection. For this reason, the user can perform subdivision of the contents with one-hand operation.

It is a nasal spray sprayer which is 1st embodiment of this invention, Comprising: The side view which shows the initial state before the operation in a partial cross section, and its partial enlarged view. It is the perspective view which showed the connection part of a 1st shaft member and a 2nd shaft member typically in the same embodiment. It is a side view which shows the state in which the 1st ejection was completed in the same embodiment in a partial cross section. It is a side view which shows in the same embodiment the state which loosened pushing of the plunger in order to start the 2nd ejection in a partial cross section. It is a side view which shows the state in the same embodiment in the state immediately after the 2nd ejection started. It is a side view which shows the state which in the same embodiment completed the 2nd ejection.

  Hereinafter, with reference to drawings, nasal spray spray device 1 which is one embodiment of the present invention is explained in detail.

  In FIG. 1, the code | symbol 2 is a fixed quantity syringe which can be filled with the nasal drop C as a content. The syringe 2 has a hollow barrel portion 2a, and a distal end portion 2c is integrally connected to the barrel portion 2a via a shoulder portion 2b. The distal end portion 2c has a smaller diameter than the body portion 2a. Further, the body portion 2a is integrally provided with a flange portion 2d at the rear end portion facing the front end portion 2c so that the rear end thereof coincides with the rear end 2e of the syringe 2.

  Reference numeral 3 denotes a plunger accommodated in the syringe 2. The plunger 3 includes a first shaft member 3a and a second shaft member 3b disposed behind the first shaft member 3a.

  As for the 1st shaft member 3a, piston 4 is provided in the front-end | tip part accommodated in the syringe 2. As shown in FIG. The piston 4 is made of an elastic material such as rubber, and is slidably held on the inner peripheral surface 2f of the syringe barrel 2a.

A space R ₁ is formed between the syringe 2 and the piston 4. The nasal spray C is filled in the space R ₁ . The nasal spray C filled in the space R ₁ is pumped to the through hole A 1 formed in the distal end portion 2 c by pushing the plunger 3.

Further, (illustrated in FIG., Numerals, only one) first shaft member 3a has four elastic pieces 3a ₁ is integrally provided extending rearward. The elastic piece 3a ₁ is provided with a sliding projection 3a ₂ and a locking projection 3a ₃ . The sliding projection 3a ₂ and the locking projection 3a ₃ are provided in the order of the sliding projection 3a ₂ and the locking projection 3a ₃ with an interval rearward along the axis O. The sliding protrusion 3a ₂ has an inclined surface 3f ₀ that inclines toward the tip. Thereby, since the sliding protrusion 3a ₂ enters from the rear end opening A2 of the syringe 2 and slides on the inner peripheral surface 2f of the syringe 2, the plunger 3 is allowed to be pushed in. Further, as will be described later, the locking projection 3a ₃ is hooked on the rear end 2e of the syringe to prevent the plunger 3 from being pushed.

In this embodiment, as shown in FIG. 2, the first shaft member 3a has a base portion 3a ₄ for fixing the piston ₄ , and the elastic pieces 3a ₁ are connected to the base portion 3a ₄ via the ring portions 3a ₅ respectively. ing. As the base portion 3a ₄ , for example, an H-shaped cross-sectional shape in which a lateral wall is spanned between two opposing side walls can be adopted as in this embodiment. Thereby, the elastic piece 3a ₁ can be bent and deformed so that the free end side can be deformed and restored with the connecting end with the ring portion 3a ₅ as the fixed end 3e ₀ .

In this embodiment, the locking projection 3a ₃ is formed integrally with the free end side portion of the elastic piece 3a ₁ . Thereby, in this embodiment, the rear end surface 3e ₁ of the locking projection 3a ₃ is configured as a free end of the elastic piece 3a ₁ . In this embodiment, the rear end surface (hereinafter referred to as “locking projection side free end”) 3e ₁ formed on the locking projection 3a ₃ decreases outward at an angle θ as shown in the enlarged view of FIG. Tapered. It should be noted that the value of θ can be changed as appropriate according to the size of the nasal spray ejector.

In addition, in this embodiment, as shown in FIG. 2, a step D is provided at the free end of the elastic piece 3a ₁ . Step D is also as would be configured as a free end of the elastic piece 3a _1, it is formed on the inner peripheral surface side of the elastic pieces 3a _1. In this embodiment, as shown in the enlarged view of FIG. 1, the bottom surface of the step D (hereinafter referred to as “step bottom side free end”) 3e ₂ is in contact with the second shaft member 3b and on the second shaft member 3b. It is formed as a pressure receiving surface to be pressed. Further, the side surface (hereinafter referred to as “step side surface side free end”) 3e ₃ of the step D connected to the step bottom surface side free end 3e ₂ is formed as a tapered surface that expands outward.

The second shaft member 3b, as shown in FIG. 1 has a body portion 3b ₂ having a pressing portion 3b ₁ for the user pushes the plunger 3. As shown in the enlarged view of the figure, the end surface 3f ₁ on the front end side of the main body 3b ₂ is a pressing surface that presses the step bottom free end 3e ₂ of the first shaft member (hereinafter referred to as “pressing end surface 3f ₁ ”). It is formed as. The pressing end surface 3f ₁ presses the step bottom surface side free end 3e ₂ of the first shaft member by pressing the second shaft member 3b, and causes the plunger 3 as a whole to be pressed. Further, the main body portion 3b _2, tapered surface 3f ₂ corresponding to the step side side free end 3e ₃ of the elastic pieces 3a ₁ is formed. In this embodiment, the taper surface 3f ₂ is a taper surface having an angle substantially equal to that of the step side surface side free end 3e _3, and a gap G is formed between them.

In addition, the pin portion 3b ₃ is integrally connected to the main body portion 3b ₂ . The pin portion 3b ₃ has a smaller diameter than the main body portion 3b ₂ . The tip of the pin portion 3b _3, the head 3b ₄ of large diameter is formed integrally than the pin portion 3b _3. On the other hand, a space S is formed between the base portion 3a ₄ and the ring portion a ₅ . For example, as shown in FIG. 2, the space S is formed by opening a part of the lateral wall of the base 3 a ₄ . In the space S, the head 3b ₄ can be accommodated through the through hole A3 formed in the ring part a ₅ . Further, as shown in the figure, the through hole A3 is constituted by an annular tapered surface 3f ₅ formed in the ring part a ₅ . The annular tapered surface 3f ₅ decreases in diameter toward the tip. Accordingly, the head 3b ₄ having a diameter larger than the minimum diameter of the through hole A3 can be inserted into the space S, and the edge around the through hole A3 in which the annular tapered surface 3f ₅ is formed is retained to prevent the head 3b ₄ from coming off. It can function as a locking part.

The space S has a play in which the head 3b ₄ can be moved back and forth along the axis O. Thereby, the 1st shaft member 3a and the 2nd shaft member 3b can be connected so that a movement along the axis line O is mutually possible.

  In FIG. 1, the code | symbol 5 is a nozzle with which the syringe front-end | tip part 2c is mounted | worn. The nozzle 5 incorporates the spray tip 6 and can spray the nasal spray C pumped through the through hole A1 from the ejection hole A4.

Here, the usage method of this embodiment is demonstrated.
The user first pushes the second shaft member 3b after inserting the nozzle 5 into one of the nostrils in the state shown in FIG. Then, as shown in the enlarged view, the pressing end surface 3f ₁ of the main body 3b ₂ presses the step bottom surface side free end 3e ₂ of the first shaft member 3a, so that the first shaft member 3a and the second shaft member 3b together Pushed in. At this time, the sliding protrusion 3a ₂ of the second shaft member 3b, since it has an inclined surface 3f _o is tapered toward the distal end may enter the syringe rear end opening A2 into the syringe 2.

The pressing end surface 3f ₁ of the second shaft member 3b contacts and presses the step bottom side free end 3e ₂ of the elastic piece 3a ₁ . For this reason, the movement of the free end of the elastic piece 3a ₁ is restrained between the syringe 2 and the elastic piece 3a ₁ . As a result, the elastic piece 3a _1, as shown in FIG. 3, flexural deformation was sliding protrusion 3a ₂ starting from occurs, the sliding projection 3a ₂ is to slide the inner peripheral surface 2f of the syringe Therefore, it is possible to allow the plunger 3 to be pushed. Thus, as shown in the figure, that the locking protrusion 3a ₃ provided on the elastic pieces 3a ₁ until it contacts the rear end 2e of the syringe, a predetermined amount ejected from the ejection hole A4 of nose drops C in the nostrils Can do.

When the locking projection 3a ₃ provided on the elastic pieces 3a ₁ contacts the rear end 2e of the syringe 2, so it becomes impossible to push the plunger 3, the spray for the first time, leaving a space R ₂ two-dot drops C is finish. Note that the capacity of the space R ₂ can be appropriately selected according to the purpose of use, but is, for example, half the capacity of the space R ₁ .

Next, when the push-in of the second shaft member 3b is loosened, as shown in FIG. 4, the free end side of the elastic piece 3a ₁ is restored from the sliding projection 3a ₂ as a starting point by the restoring force of the bending deformation. At this time, since the fixed end 3e ₀ side of the elastic pieces 3a ₁ remains deformed inwardly starting from the slide projection 3a _2, the free end of the elastic piece 3a _1, as shown in the figure, the sliding Restoring obliquely inward so as to align with the fixed end 3e ₀ side deformed inward starting from the protrusion 3a ₂ . For this reason, the locking projection 3a ₃ is also displaced obliquely inward so as to follow the free end side of the elastic piece 3a ₁ , thereby releasing the locking state of the locking projection 3a ₃ as shown in FIG. The

In particular, in this embodiment, as shown in the enlarged view of FIG. 3, a step D is provided at the free end of the elastic piece 3a ₁ , and the step bottom side free end 3e ₂ is used as a pressure receiving surface from the second shaft member 3b. and forming, by a step side surface side free end 3e ₃ is formed into a tapered surface to release the free end of the elastic piece 3a _1, it is possible to perform pushing back of the second shaft member 3b smoothly. In addition, in this embodiment, the second shaft member 3b, since the tapered surface 3f ₂ corresponding to the first shaft member 3a is formed, it is possible to push back the second shaft member 3a smoothly.

Accordingly, after the second shaft member 3b is loosened and then the second shaft member 3b is pushed again, the second ejection can be performed. In this embodiment, if the second shaft member 3b is pushed in after the second shaft member 3b is pushed back, the pressing end surface 3f ₁ of the second shaft member 3b contacts the locking projection 3a ₃ as shown in FIG. Can be made. For this reason, the elastic piece 3a ₁ can be pushed into the first shaft member 3a by restoring the sliding protrusion 3a ₂ as a starting point.

In particular, in this embodiment, since the locking projection side free end 3e ₁ is tapered, even if the free end side of the elastic piece 3a ₁ is restored from the sliding projection 3a ₂ as a starting point, the pressing end surface of the second shaft member 3b Since the contact can be made in a state almost parallel to 3f ₁ , the first shaft member 3a can be pushed in smoothly.

Therefore, as shown in FIG. 4, after the second shaft member 3b is loosened and the second shaft member 3b is pushed back, the nozzle 6 is inserted into the other nostril, and as shown in FIG. if pushed a second shaft member 3b, as shown in FIG. 6, the nose drops point C remaining in the space R ₂ from the ejection hole A4 can be ejected into the nostrils.

  As described above, according to this embodiment, the nasal spray C can be subdivided and sprayed. In addition, in this embodiment, if the second shaft member 3b is loosely pushed, the second ejection can be performed, so that it is not necessary to change the second shaft member 3b when performing the second ejection. For this reason, the user can perform subdivision of the contents with one-hand operation.

The above are various embodiments of the present invention, but various modifications are possible according to the present invention. For example, the elastic piece 3a ₁ can be provided in at least one place, but when the plunger 3 is surely stopped and accurate subdivision is realized, a plurality of elastic pieces 3a ₁ are preferably provided as in this embodiment. In particular, as in this embodiment, when an even number is arranged, the balance around the axis O is stabilized, and thus a satisfactory operation can be realized. In the above-described embodiment, the syringe-type ejector has been described as a nebulizer. However, according to the present invention, the contents can be ejected in various forms, such as being ejected as bubbles or ejected as normal liquid. .

  The present invention can be adopted in various forms as long as it is a syringe type ejector provided with a syringe having a flange portion and a plunger that can be pushed into the syringe. Various contents can be adopted without being limited to nasal drops.

1 nasal spray sprayer (syringe type sprayer)
2 Syringe 2a Body 2b Shoulder 2c Tip 2d Flange 3 Plunger 3a First shaft member 3a ₁ Elastic piece 3a ₂ Inclination protrusion 3a ₃ Locking protrusion 3a ₄ Base 3a ₅ Ring part 3b Second shaft member 3b ₁ Press part 3b ₂ large diameter portion 3b ₃ pin 3b ₄ head 3e ₀ fixed end of elastic piece 3e ₁ locking projection side free end 3e ₂ step bottom side free end 3e ₃ step side free end 3f ₁ pressing end surface 3f ₂ taper surface 3b ₃ Pin 3b ₄ Head 4 Piston 5 Nozzle 4a Auxiliary flange 6 Spray tip A1 Front end through hole A2 Rear end opening A3 Spatial through hole A4 Nozzle ejection hole C Nasal spray (contents)
D Step (Free end)
G Gap R Filling space S Play space

Claims (6)

A quantitative syringe type ejector comprising a syringe having a flange portion and a plunger that can be pushed into the syringe,
The plunger has a first shaft member having a piston at the tip, and a second shaft member disposed at the rear end of the first shaft member,
The first shaft member is integrally provided with at least one elastic piece extending backward, and can enter the elastic piece from the rear end opening of the syringe and slide on the inner peripheral surface of the syringe. Sliding protrusions and locking protrusions that are locked to the rear end of the syringe are provided,
The second shaft member has an end surface that presses the free end of the elastic piece, and the free end of the elastic piece is constrained between the syringe and the syringe by pressing from the end surface, so that the elastic piece starts from a sliding protrusion. The locking protrusion is locked to the rear end of the syringe by causing the bending deformation, and the locking protrusion is released by the restoring force starting from the sliding protrusion of the bending deformation by relaxing the pressing. der which is,
By the release of the locking of the locking projection, the metering syringe-type ejector according to claim further depressible der Rukoto the plunger into the syringe.   2. The first shaft member according to claim 1, wherein the first shaft member is provided with a space for receiving the second shaft member and a locking portion for retaining the second shaft member to prevent the second shaft member from being detached. The metering syringe type ejector, wherein the second shaft member is formed so as to be movable in the first shaft member during relaxation.   3. The taper according to claim 1, wherein a step is provided at a free end of the elastic piece, a bottom surface of the step is formed on a pressure receiving surface from the second shaft member, and a side surface of the step is released from a free end side of the elastic piece. A fixed-quantity syringe type ejector characterized by being formed on a surface.   4. The metered syringe ejector according to claim 1, wherein a free end of the elastic piece is tapered.   The metering syringe ejector according to claim 4, wherein the second shaft member has a tapered surface corresponding to the first shaft member.   The metering syringe type ejector according to any one of claims 1 to 5, wherein a spray nozzle is provided at a tip portion of the syringe.