JP5960039B2 - Metered syringe type ejector - Google Patents

Description

  The present invention relates to a fixed-quantity syringe-type ejector that includes a syringe having a finger-holding portion and a plunger that can be pushed into the syringe, and can divide the contents filled in one syringe into small portions to be ejected. .

  In the syringe-type ejector, for example, a piston (gasket) having a plunger rod (plunger) is disposed in the syringe, thereby forming a filling space for contents (for example, a chemical solution) between the syringe and the piston. In some cases, the contents of the filling space are taken out to the outside by pressing the plunger rod (see, for example, Patent Document 1).

JP 7-213612 A

  However, since the conventional syringe-type ejector is pushed in at a stroke without being regulated in the syringe, it is difficult to divide the contents filled in one syringe into small portions.

  An object of the present invention is to provide a novel quantitative syringe type ejector that can divide the contents filled in one syringe into small portions and eject them.

The present invention includes a syringe having a finger hook portion and a plunger that can be pushed into the syringe, and the plunger includes a piston holding member having a piston on the front side, and a plunger operating member arranged on the rear side of the piston holding member. The piston holding member has a plurality of arms that can be deformed and restored, a slide protrusion that can slide from the rear end opening of the syringe and slide on the inner peripheral surface of the syringe, and a rear end of the syringe. It has a stopper provided with a locking projection to be locked, and the plunger operating member has a notch for operably storing the stopper, and the abutting end of the notch is the free end of the stopper is formed on the pressing surface for pressing the further state, and are not engaging portion to be locked can be engaged overcome the rear end of the syringe is more spaced axially, the After the stop projection is locked to the rear end of the syringe, when the pushing of the plunger operating member is released, the locking projection is released by the restoring force starting from the sliding projection, and the plunger can be pushed again. It has become .

The said latching | locking part can be made into the protruding part latched so that it can climb over the rear end of a syringe. Moreover, while the said latching | locking part protrudes from a plunger operation member, it can also be set as the inversion part latched so that it can be reversed toward the back side from the state inclined toward the front end of the plunger operation member .

In the present invention, the plunger operating member can be pushed back, and a retaining portion for retaining the plunger operating member against the piston holding member can be provided.

  In addition, in the present invention, a step for forming a pressure receiving portion from the plunger operating member can be provided at the free end of the stopper, and the side surface of the step can be formed as a tapered surface. Further, a tapered surface can be formed at the abutting end portion of the plunger operating member. Furthermore, according to this invention, a spray nozzle can be provided in the front-end part of a syringe.

  In the present invention, when the user pushes in the plunger, the locking portion provided on the plunger operating member needs to be pressed with a force to get over the rear end of the syringe, and the locking between the raised portion and the rear end of the syringe is released. Then, the plunger can be pushed in at a stroke. As a result, the content is pushed out vigorously, so that the content liquid can be stably ejected while maintaining a constant state.

  In addition, when the plunger is pushed in, the sliding protrusion provided on the stopper of the piston holding member enters from the rear end opening of the syringe and slides on the inner peripheral surface of the syringe, and the movement of the free end of the arm is the syringe. , The bending deformation starting from the sliding protrusion is generated in the stopper. For this reason, the plunger can be ejected for the first time until the sliding protrusion is pushed in without being obstructed until the locking protrusion provided on the arm is locked to the rear end of the syringe.

  Next, when the pushing of the plunger operating member is loosened or released, the free end side of the stopper is restored from the sliding projection as a starting point by the restoring force starting from the bending deformation sliding projection. At this time, since the fixed end side of the stopper remains deformed inward from the sliding protrusion, the free end side of the stopper is aligned with the fixed end side deformed inward from the sliding protrusion. Restore diagonally inward. For this reason, the latching protrusion is released obliquely inward so as to follow the free end side of the stopper, so that 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 filled in one syringe can be taken out in a stable manner while maintaining a constant state. Further, in the present invention, the second ejection can be performed only by loosening or releasing the pushing of the plunger operating member. For this reason, the user does not have to change the ejector when performing the second ejection. Therefore, the user can perform subdivision of the contents with one-hand operation.

  In addition, in the present invention, since the notch for operably storing the stopper is formed in the plunger operation member, the entire length of the plunger can be shortened, and rattling caused by assembling the piston holding member and the plunger operation member can be reduced. can do. Therefore, according to the present invention, it is possible to divide the contents into small portions while maintaining a good operation.

It is the nasal spray sprayer which is the 1st Embodiment of this invention, Comprising: The one side view which shows the initial state before the operation in a partial cross section, and its partial enlarged view. It is the other side view and partial enlargement which show the initial state before operation of the embodiment in a partial cross section. In this embodiment, (a) is an enlarged cross-sectional view showing a state in which the plunger is pushed in and the first spray is started, and (b) is an enlarged cross-sectional view showing a state in which the first spray is completed. (C) is an expanded sectional view which shows the state which loosened pushing of the plunger in order to start the 2nd spraying. It is sectional drawing which shows the state in which spraying was made | formed in the same embodiment. FIG. 4 is an exploded perspective view schematically showing a part of a piston holding member and a plunger operating member in the same embodiment. It is a plunger concerning the nasal spray sprayer which is the 2nd Embodiment of this invention, Comprising: It is the disassembled perspective view which showed typically a part of piston holding member and the plunger operation member.

  Hereinafter, with reference to drawings, a fixed-quantity syringe type ejector of the present invention is explained in detail using various embodiments.

  In FIG. 1, the code | symbol 1 is a nasal spray sprayer which is the 1st Embodiment of this invention. The nasal spray device 1 has a syringe 10 made of synthetic resin or glass. The syringe 10 has a hollow body 11 that can be filled with contents (nasal drops) M, and a front end 13 is integrally connected to the body 11 via a shoulder 12. The front end portion 13 has a smaller diameter than the body portion 11. An internal passage r is formed inside the front end portion 13.

  Reference numeral 20 denotes a spray nozzle that can be attached to and detached from the syringe 10. The spray nozzle 20 has a main body 21 detachably fitted to the front end portion 13. A nozzle chip 22 is built into the main body 21. In addition, an ejection hole 1 a communicating with the nozzle tip 22 is formed at the front end of the main body 21. Thereby, the spray nozzle 20 can spray the contents M to the outside through the ejection hole 1a.

In addition, a finger-hanging portion 14 that protrudes outward is separately provided at the rear end portion of the trunk portion 11. The finger hook 14 is formed with an opening (hereinafter referred to as “rear end opening”) A ₁ that allows the inside of the syringe 10 to communicate with the outside. Further, the rear end of the finger hook 14 constitutes the rear end of the syringe 10 (hereinafter, “syringe rear end”) 10e. In addition, according to the present invention, the finger hooking portion 14 can be provided integrally with the trunk portion 11.

  Reference sign P is a synthetic resin plunger accommodated in the syringe 10. The plunger P includes a piston holding member 30 and a plunger operating member 40 disposed behind the piston holding member 30.

The piston holding member 30 has a holding part main body 31, and a piston (gasket) 30 p is provided at the front end of the holding part main body 31. The piston 30p is placed into the syringe 10 through the rear end opening A _1. The piston 30p is slidably held on the inner peripheral surface 10f of the syringe 10. The piston 30p is made of an elastic material such as rubber, for example. As a result, a filling space S ₁ is formed between the nozzle 20 and the piston 30 p for sealingly holding the contents M filled in the syringe 10.

  As shown in FIG. 5, the holding portion main body 31 integrally includes four vertically long plate portions 31 a and a disc portion 31 b. Further, a shaft 32 is provided integrally with the holding portion main body 31. The shaft 32 has a shaft body 32a having a smaller diameter than the disk portion 31b. The shaft main body 32a extends rearward along the axis O from the disk portion 31b. A head 32b having a larger diameter than the shaft main body 32a is integrally provided at the front end (rear end) of the shaft main body 32a. The head 32b has an inclined surface 32f that tapers toward the front end (rear end).

  Further, the stopper main body 31 is integrally provided with two stoppers 30s. The stopper 30s is disposed at a position facing the shaft 32 with the shaft 32 interposed therebetween. The stopper 30s has an arm 33 that is integrally fixed to the disk portion 31b. Each of the arms 33 has a flat shape and extends rearward along the axis O from the disk portion 31b. That is, the fixed end of the arm 33 functions as the fixed end 30a of the stopper 30s. Accordingly, each of the stoppers 30s can be deformed from the fixed end 30a to the base point by applying an external force from the initial position shown in FIG. 5 (the same applies to FIGS. 1 and 2). Each stopper 30s can be restored to the initial position by releasing a load such as an external force.

Further, the stopper 30 s has a sliding projection 34 provided integrally with the arm 33. The sliding protrusion 34 has an inclined surface 34f that inclines toward the fixed end 30a. Thus, the sliding protrusion 34 can be easily entered into the syringe 10 from the rear end opening A _1. Further, the stopper 30 s has a locking projection 35 provided integrally with the arm 33. The locking protrusions 35 are provided at intervals from the sliding protrusions 34 toward the rear. In the present embodiment, the locking projection 35 is integrally formed as a portion in which the free end (free end of the arm) 30e of the stopper 30 protrudes outward. Thereby, in this embodiment, the rear end of the locking projection 35 functions as the free end 30e of the stopper 30s.

  In the present embodiment, the free end 30e of the stopper 30 is tapered (inclined) as shown in the enlarged view of FIG. Since the free end 30e is tapered, the free end 30e decreases outward at an angle θ with respect to a horizontal line orthogonal to the central axis (hereinafter referred to as “axis”) O of the nasal spray sprayer 1. The value of θ can be appropriately changed according to the size of the nasal spray ejector.

  In addition, in this embodiment, as shown in the enlarged view of FIG. The step 36 is formed on the inner surface side of the stopper 30s. In this embodiment, as shown in the figure, the step 36 is formed as a pressure receiving portion. The step 36 (hereinafter referred to as “pressure receiving portion 36”) is formed by a flat abutting end surface 36a and an abutting side surface 36b connected to the bottom surface 36a. In the present embodiment, the abutting side surface 36b is formed as a tapered surface inclined outward.

On the other hand, as shown in FIG. 5, the plunger operation member 40 has an operation portion main body 41, and a pressing portion 42 for a user to push in the piston holding member 30 is integrally provided at the rear end. The operation unit main body 41 has a cylindrical shape as shown in FIG. Inside the plunger operating member 40, the internal space S ₂ which penetrates between its front end 40a and rear end 40b is formed. The internal space S ₂ houses the shaft 32.

The inner space S _2, the annular projection 43 is interposed. The annular protrusion 43 protrudes from the inside of the operation portion main body 41, and forms an opening A ₂ having a smaller diameter than the internal space S ₂ on the inside. The opening A ₂ has an inner diameter that is larger than the shaft body 32a and smaller than the head 32b. Thereby, as shown in FIG. 2, the plunger operating member 40 penetrates the shaft 32 and holds the head 32 b to prevent it from coming off. That is, the head 32 b and the annular protrusion 43 function as a retaining portion that retains and retains the piston holding member 30 on the plunger operating member 40. In particular, in the present embodiment, as shown in FIG. 5, the inner peripheral surface 4 f of the annular protrusion 43 is configured with a tapered surface whose diameter decreases toward the rear. Thereby, as shown in FIG. 2, the head 32 b can be easily assembled to the upper end of the annular protrusion 43. Further, the plunger operating member 40, the annular projection 43 of the head 32b, that protrude to the rear end side, of the internal space S _2, at the internal space S ₂ at the rear end side of the annular projection 43, play A space S is formed. In the play space S, the head 32 b can be moved back and forth along the axis O. As a result, the piston holding member 30 and the plunger operating member 40 are connected to form the plunger P, and the piston holding member 30 and the plunger operating member 40 are axially connected to each other by the gap between the head 32b and the annular protrusion 43. O can be moved along.

Further, as shown in FIG. 5, the operation portion main body 41 is formed with a plurality of notches 40 c that communicate with the internal space S ₂ . In the present embodiment, the notches 40c are formed at two locations corresponding to the stoppers 30s. As shown in FIG. 5, the notch 40c accommodates the stopper 30s together with the shaft 32, thereby restricting the movement of the stopper 30s substantially only in the radially outward direction.

  The abutting end portion 44 of the notch 40c is formed as a pressing portion. The abutting end portion 44 (hereinafter referred to as “pressing portion 44”) is formed by a abutting end surface 44a and a abutting side surface 44b connected to the abutting end surface 44a. In the present embodiment, the abutting end surface 44a is formed as a flat surface as shown in the enlarged view of FIG. The abutting end surface 44a functions as a pressing surface (hereinafter referred to as “pressing surface 44a”) that presses against the abutting end surface 36a provided on the piston holding member 30, and the abutting end surface 36a is a pressure receiving surface (hereinafter referred to as “pressing surface 44a”). "Pressure receiving surface 36a"). Thereby, the pressing part 44 presses the pressure receiving part 36 by pushing the plunger operating member 40. That is, the plunger P can push the piston 30 a (holding member 30) into the syringe 10 by pushing the plunger operating member 40.

  The abutting side surface 44b is formed as a tapered surface that tapers toward the pressing surface 44a. In the present embodiment, the inclination angle of the abutting side surface 44 b is substantially equal to the abutting side surface 36 b of the piston holding member 30. In addition, in the present embodiment, a gap G is formed between the abutting side surface 36b and the abutting side surface 44b.

In addition, as shown in FIG. 2, the plunger operating member 40 is provided with a plurality of engaging portions 46 integrally provided at positions facing the operating portion main body 41 across the notch 40 c (axis O). Yes. The locking portion 46 is formed as a raised portion that integrally rises from the plunger operating member 40 (hereinafter referred to as “the raised portion 46”). Between the two ridges 46 facing each other across the cutout 40c, the maximum dimension is set to be larger than the rear end inner diameter of the opening A ₁ formed in the syringe 10 as shown in FIG. ing. Thereby, the raised part 46 is latched with respect to the syringe 10 by being hooked on the syringe rear end 10e. In addition, the difference between the maximum dimension between the two raised portions 46 and the inner diameter of the rear end opening A ₁ is as follows when the raised portion 46 presses the syringe rear end 10e with a force of a certain level or more by pushing the plunger P. It is set to be able to get over the syringe rear end 10e. Thereby, the protruding portion 46 is locked so as to be able to ride over the rear end 10e of the syringe by pushing the plunger P.

In addition, as shown in FIG. 2, the raised portions 46 are arranged at intervals in the direction of the axis O. In this embodiment, the raised portion 46, each portion of the operation portion main body 41 which is divided by the notch 40c with the internal space S _2, are spaced in the axial O direction at the position of the two positions. In the present embodiment, the raised portion 46 protrudes from the operation portion main body 41 in a dome shape. Further, as shown in FIG. 1, the raised portion 46 is formed in an elliptical shape extending in the width direction of the operation portion main body 41.

Here, the usage method of this embodiment is demonstrated.
In the state shown in FIG. 1, the user first puts his / her index finger and middle finger on the finger hook 14, presses the rear end 40 b with the thumb and inserts the nozzle 20 into one of the nostrils, and then pushes in the plunger operating member 40. At this time, it is necessary for the raised portion 46 provided on the plunger operating member 40 to be pressed with a force over the syringe rear end 10e, and the raised portion 46 gets over the syringe rear end 10e until the pressing force reaches a certain force. There is nothing. For this reason, when the plunger operating member 40 is further pressed, the pressing force reaches a certain force, and the protruding portion 46 gets over the syringe rear end 10e, so that the locking between the protruding portion 46 and the syringe rear end 10e is released. The Thereby, the plunger operation member 40 can be pushed in.

When the plunger operating member 40 is pushed in, as shown in the enlarged view, the pressing surface 44a of the plunger operating member 40 presses the pressure receiving surface 36a of the piston holding member 30, so that the piston holding member 30 is also pushed together with the plunger operating member 40. It is. At this time, the sliding protrusion 34 of the stopper 30s is because it has an inclined surface 34f, as shown in FIG. 3 (a), can enter from the rear end opening A ₁ into syringe 10. At this time, the pressing surface 44a of the plunger operating member 40 for pressing the pressure receiving surface 36a of the piston operating member 30 with a large force, the sliding protrusion 34 of the stopper 30s is to enter from the rear end opening portion A ₁ in the syringe The peripheral surface 10f is slid at a stretch. That is, when the pressing force on the plunger operating member 40 reaches a certain force, the piston holding member 30 in the syringe 10 can be pushed in at a stroke. Thereby, the content M is pushed out vigorously, so that the content M can be stably ejected while maintaining a constant state.

Further, the piston holding member 30 has a pressing surface 44a of the plunger operating member 40 that contacts and presses the pressure receiving surface 36a of the stopper 30s, and a sliding projection 34 of the stopper 30s contacts the inner peripheral surface 10f of the syringe. The movement of the stopper 30 s is restrained by pressing the free end 35 of the stopper 30 s against the pressing surface 44 a of the plunger operating member 40. Therefore, when the sliding protrusion 34 of the stopper 30s enters from the rear end opening A _1, movement of the stopper 30s of the syringe 10. also be bound, the entire stopper 30s as shown in FIG. 3 (b) In addition, bending deformation starting from the sliding projection 34 occurs. Thereby, the piston holding member 30 can be pushed in along the syringe inner peripheral surface 10f without the sliding protrusion 34 interfering with the bending deformation generated in the stopper 30s. Thereby, as shown in the figure, the nasal spray sprayer 1 puts the content M from the spout 1a into the nostril until a locking projection 35 provided on the stopper 30s contacts the rear end 10e of the syringe. Can be ejected.

When the locking projection 35 comes into contact with the syringe rear end 10e, so it can not push the piston holding member 30, the first ejection, leaving the contents of M in the filling space S ₁ is terminated. The capacity of the filling space S ₁ at this point can be appropriately selected according to the purpose of use, but is, for example, half the capacity of the filling space S ₁ before the start of ejection.

  Next, when the pushing of the plunger operating member 40 is loosened or released, as shown in FIG. 3C, the free end 30e side of the stopper 30s is restored from the sliding protrusion 34 by the restoring force of the bending deformation. . At this time, the fixed end 30a side of the stopper 30s remains deformed inward from the sliding protrusion 34, so that the free end 30e side of the stopper 30s starts from the sliding protrusion 34 as shown in FIG. Restoring diagonally inward so as to align with the fixed end 30a side that has been deformed inward. For this reason, the locking projection 35 is also displaced obliquely inward so as to follow the free end 30e side of the stopper 30s, whereby the locking state of the locking projection 35 is released as shown in FIG.

  In particular, in the present embodiment, as described in the enlarged view of FIG. 1, when the plunger operating member 40 is pushed in, the abutting side surface 44 b is regulated by the abutting side surface 36 b of the piston holding member 30. 30 can be pushed in effectively. Further, when the pushing of the plunger operating member 40 is released, the abutting side surface 44b moves to the abutting side surface 36b of the piston holding member 30, so that the free end 30e side of the stopper 30s easily pushes back the plunger operating member 40. By escaping, the deformation of the stopper 30s can be easily restored.

  As a result, after the plunger operation member 40 is released or released, the second operation can be performed by pushing the plunger operation member 40 again. In the present embodiment, since the raised portions 46 are provided in two rows along the axis O, when the plunger operating member 40 is pushed in after the locked state by the stopper 30s is released, the other raised portion 46 is formed. Locked to the syringe rear end 10e. For this reason, when the plunger operation member 40 is pushed in again after the plunger operation member 40 is pushed back, it is necessary to press the bulging portion 46 again with a force over the syringe rear end 10e. For this reason, when the second ejection is performed, the plunger operating member 40 is pressed with a large force as in the first ejection operation. Then, the plunger operation member 40 can be pushed in at a time by releasing the locking of the second raised portion 46 and the syringe rear end 10e. Thereby, as shown in FIG. 4, the pressing portion 44 of the plunger operating member 40 can be pushed into the engaging protrusion 35 (free end 30 e) of the piston holding member 30 at a stretch with a large force. For this reason, after the stopper 30 s has been restored from the sliding protrusion 34, the piston holding member 30 can be pushed in at a stroke.

  In particular, in the present embodiment, since the free end 30e of the stopper 30s is tapered, even if the free end 30e side of the stopper 30s is restored from the sliding protrusion 34, it is almost parallel to the pressing surface 44a of the plunger operating member 40. Since it can contact in a state, the piston holding member 30 can be pushed in smoothly.

Therefore, as shown in FIG. 3C, after the plunger operating member 40 is loosened or released and the plunger operating member 40 is pushed back, the nozzle 20 is inserted into the other nostril and the plunger if pushed the operating member 40, as shown in FIG. 4, similarly to the first the contents of M remaining filling space S ₁ from the ejection port 1a, it is possible to stably ejected while keeping in a constant state.

  As described above, according to the present embodiment, the contents M filled in one syringe 10 can be stably and subdivided while being kept in a constant state. Moreover, in this embodiment, if pushing of the plunger operation member 40 is loosened or cancelled | released, the 2nd ejection will be attained. For this reason, it is not necessary to change the nasal spray sprayer 1 when performing the second ejection. Therefore, the user can perform subdivision of the contents with one-hand operation.

  In addition, in this embodiment, since the notch 40c that operably accommodates the stopper 30s is formed in the plunger operating member 40, the overall length of the plunger P can be shortened, and the piston holding member 30 and the plunger operating member 40 can be connected. The looseness (for example, movement around the axis O of the shaft 32) generated by the assembly can be reduced. Therefore, according to this embodiment, the contents can be subdivided and ejected while maintaining a good operation.

  Furthermore, according to the present invention, the locking portion (the raised portion 46) can be changed. FIG. 6 shows a modification of the locking portion as the second embodiment. The locking portion 47 according to the present embodiment is a reversible reversing portion (hereinafter, “reversing portion 47”) that integrally protrudes from the plunger operating member 40. The reversing part 47 is formed as a blade piece protruding outward from the operation part main body 41. The reversing part 47 is inclined toward the front end of the plunger operating member 40. When the reversing part 47 presses the plunger operating member 40, the reversing part 47 reverses as shown by an arrow to generate sliding resistance. Thereby, the inversion part 47 is latched so that it can get over with respect to the syringe rear end 10e by pushing in the plunger P like the protruding part 46.

  The above are various embodiments of the present invention, but various modifications are possible according to the present invention. For example, two or more stoppers 30s and notches 40c can be provided. In particular, as in the present embodiment, when an even number is arranged, the balance around the axis O is stabilized, so that a favorable 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 employed in various forms as long as it is a metering 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 sprayer (quantitative syringe type sprayer)
DESCRIPTION OF SYMBOLS 1a Spout 10 Syringe 11 Trunk part 12 Shoulder part 13 Front end part 14 Finger hook part 20 Nozzle 21 Main body 22 Spray tip 30 Piston holding member 30a Stopper fixed end 30p Piston (gasket)
30s Stopper 43b Stopper free end 31 Holding part main body 32 Shaft 32a Shaft main body 32b Head 33 Arm 34 Sliding projection 34f Inclined surface 35 Locking projection 36 Step (pressure receiving surface)
36a End face (pressure-receiving surface)
36b Abutting side surface 40 Plunger operating member 40c Notch 41 Operating portion main body 42 Plunger operating portion 43 Annular projection 44 Abutting end (pressing portion)
44a End face (pressing surface)
44b Abutting side face 46 Raised part (locking part)
47 Inversion part (locking part)
A ₁ Syringe rear end opening A ₂ opening G Gap M Contents (nasal drops)
r Internal space S _1- point nasal spray filling space S ₂ Internal space S Play space

Claims (7)

Comprising a syringe having a finger hook and a plunger that can be pushed into the syringe;
The plunger has a piston holding member having a piston on the front side, and a plunger operating member arranged on the rear side of the piston holding member,
The piston holding member is engaged with a plurality of arms that can be deformed and restored, a sliding protrusion that can slide from the rear end opening of the syringe and slide on the inner peripheral surface of the syringe, and a rear end of the syringe. Having a stopper provided with a locking projection,
The plunger operating member is formed with a notch that operably accommodates the stopper, and the abutting end of the notch is formed as a pressing portion that presses the free end of the stopper, and further over the rear end of the syringe. possible locking portion to be engaged is spaced axially all SANYO which is more disposed,
When the pushing of the plunger operating member is released after the locking protrusion is locked to the rear end of the syringe, the locking protrusion is released by the restoring force starting from the sliding protrusion, and the plunger can be pushed again. A fixed-quantity syringe-type ejector.   The metering syringe ejector according to claim 1, wherein the locking portion is a raised portion that rises from the plunger operation member. 2. The metering syringe type ejector according to claim 1, wherein the locking portion protrudes from the plunger operating member and is a reversing portion that can be reversed toward the rear side from a state inclined toward the front end of the plunger operating member . The metering syringe ejector according to any one of claims 1 to 3, wherein the plunger operating member can be pushed back and a retaining portion for retaining the plunger operating member against the piston holding member is provided.   5. The metering syringe type according to claim 1, wherein a step for forming a pressure receiving portion from the plunger operating member is provided at a free end of the stopper, and a side surface of the step is formed as a tapered surface. Ejector.   The metering syringe ejector according to any one of claims 1 to 5, wherein a tapered surface is formed at an abutting end portion of the plunger operating member.   7. A metered syringe ejector according to claim 1, wherein a spray nozzle is provided at the front end of the syringe.

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