JP2015167824A - Metered-dose syringe type ejector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel metered-dose syringe type ejector capable of ejecting a content fluid in small quantity and preventing a reuse after being used once.SOLUTION: A plunger 3 of the metered-dose syringe type spray device, includes a plunger body 40 that pushes a piston P, and an elastic arm 44 that has protrusions 45 and 46 protruding towards the inner peripheral surface of a syringe 2 and is connected to the plunger body 40. The syringe 2 includes, at the inner peripheral surface thereof, a diameter contraction part 33 that, by pushing of the plunger 3, comes into contact with the protrusions 45 and 46 to bend the elastic arm 44 inward and, when the pushing of the plunger 3 is finished, restores the elastic arm 44.

Description

  The present invention relates to a quantitative syringe-type ejector including a syringe and a plunger that is inserted from the rear end side of the syringe and pushes a piston by pressing an operation unit to eject the content liquid.

  As a syringe-type ejector for ejecting a content liquid such as a chemical solution, for example, as described in Patent Document 1, a plunger main body portion (a first body having a piston at the front end and an elastic arm (elastic piece) at the rear end is described. 1) and a plunger operating member (second shaft member) disposed on the rear end side of the plunger main body portion and pressing the elastic arm toward the front end side. In addition, a fixed-quantity syringe-type jet provided with a sliding projection that deflects the elastic arm inward while sliding on the inner peripheral surface of the syringe, and a locking projection that is locked by the syringe and temporarily stops the plunger from being pushed The vessel is known. According to this fixed quantity syringe type ejector, the plunger can be pushed in again only by loosening or releasing the paused plunger, so that the content liquid can be ejected in small portions with a simple operation. it can.

JP 2013-208603 A

  By the way, since the fixed-quantity syringe type ejector described in patent document 1 can pull back a plunger after pouring out all the contents liquid, this can be done several times by refilling a new contents liquid in a syringe. It is possible to use. However, depending on the situation of the site where such an ejector is used, it may not be preferable to reuse it for hygiene purposes.

  An object of the present invention is to solve such a conventional problem, and it is possible to prevent reuse after being used once, while maintaining a function to divide the content liquid into small portions and to eject the liquid. It aims at providing a fixed quantity syringe type ejector.

The present invention is a metered syringe type ejector comprising a syringe and a plunger that is inserted from the rear end side of the syringe and pushes the piston by pressing the operation unit to eject the content liquid,
The plunger includes a plunger main body portion that pushes the piston, and an elastic arm that has a protrusion protruding toward the inner peripheral surface of the syringe and is coupled to the plunger main body portion.
By pushing the plunger into the inner peripheral surface of the syringe, the elastic arm is bent inward by abutting against the protrusion, and at the end of pushing the plunger, the elastic arm is restored to restore the plunger. It is a fixed_quantity | quantitative_quantity type | mold ejector provided with the reduced diameter part which prevents pullback.

  The syringe has a hollow shape and a syringe body having a radially outward protrusion on the rear end side thereof, and an inner peripheral surface that is continuous with the inner peripheral surface of the syringe body on a finger-holding portion that is engaged and held by the protrusion And a holder to which a cylinder main body part is connected, and the reduced diameter part is provided on the inner peripheral surface of the cylinder main body part.

  In addition, the syringe has a hollow body, a syringe body having a radially outward projecting portion on the rear end side thereof, and an inner periphery continuous with the inner circumferential surface of the syringe body on a finger hook portion engaged and held by the projecting portion. And a holder connected to a cylinder main body forming a surface, and the inner peripheral surface of the cylinder main body may be reduced in diameter relative to the inner peripheral surface of the syringe main body to form the reduced diameter portion.

  Further, the syringe includes a syringe body having a hollow shape and having a radially outward projecting portion on the rear end side thereof, and a holder in which a tube body portion is coupled to a finger hook portion that is engaged and held by the projecting portion, The cylinder main body portion may be extended along the inner peripheral surface of the syringe main body to form the reduced diameter portion.

  In the quantitative syringe type ejector of the present invention, the plunger is pushed into the inner peripheral surface of the syringe to bend the elastic arm in contact with the protrusion by bending the plunger, while restoring the elastic arm when the plunger is pushed. A diameter portion is provided. For this reason, after pushing the plunger to the end and ejecting the content liquid, the plunger can be prevented from being pulled back, so that reuse can be reliably prevented.

  In the metered syringe syringe of the present invention, the reduced diameter portion can be, for example, a stepped portion protruding radially inward from the inner peripheral surface of the syringe. Here, as an example of a means for forming such a syringe, there is a method of injecting molten synthetic resin into a mold and forcibly removing the stepped portion from the mold. On the other hand, the syringe has a hollow body and a syringe body having a radially outward projecting portion on the rear end side thereof, and an inner peripheral surface connected to the inner peripheral surface of the syringe body on the finger-holding portion engaged and held by the projecting portion. It is composed of a holder to which the cylindrical body part to be formed is connected, and further, a reduced diameter part is provided on the inner peripheral surface of the cylindrical main body part, or the inner peripheral surface of the cylindrical main body part is more than the inner peripheral surface of the syringe main body. In the case of reducing the diameter to make a reduced diameter portion, for example, since the reduced diameter portion can be formed with a simple configuration without forcibly removing it, the manufacturing becomes easier and the quality can be made more stable. it can. Further, the same effect can be obtained by extending the tube main body portion along the inner peripheral surface of the syringe main body as a reduced diameter portion.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half sectional view in a front view and a partially enlarged view of an embodiment of a metered syringe syringe according to the present invention. It is the disassembled perspective view which showed typically a part of plunger main-body part and a plunger operation member regarding the plunger shown in FIG. The situation where the plunger is pushed in with respect to the metering syringe type ejector shown in FIG. 1 will be described. (A) is a cross-sectional view showing a state in which the first ejection is started, and (b) is the first ejection. It is sectional drawing which shows the state completed. It is a figure explaining the continuation of FIG. 3, (a) is sectional drawing which shows the state which loosened the plunger operation member in order to start the 2nd ejection, or the state which cancelled | released, (b) It is sectional drawing which shows the state which the 2nd ejection was complete | finished. It is a modification of the fixed-quantity syringe type ejector shown in Drawing 1, and (a) is the state where the pushing of the plunger operation member was loosened or released in order to start the second ejection after the first ejection (B) is sectional drawing which shows the state which the 2nd ejection was complete | finished. It is a partial expanded sectional view which shows the syringe main body and holder used for this about other embodiment of the metering syringe type ejector according to the present invention.

  Hereinafter, with reference to drawings, the fixed-quantity syringe type ejector of the present invention is explained. In addition, in this specification, a claim, and an abstract, the front end side is a side where the nozzle 20 is located when the syringe body 10 shown in FIG. 1 is used as a reference, and vice versa. On the side.

  In FIG. 1, the code | symbol 1 shows one Embodiment of the metering syringe type ejector according to this invention. The fixed quantity syringe type ejector 1 includes a syringe 2 and a plunger 3 inserted from the rear end side of the syringe 2. The syringe 2 in the present embodiment includes a syringe body 10, a nozzle 20 attached to the distal end side of the syringe body 10, and a holder 30 attached to the rear end side of the syringe body 10. The plunger 3 includes a plunger main body portion 40, a piston P attached to the distal end side of the plunger main body portion 40, and a plunger operation member 50 attached to the rear end side of the plunger main body portion 40. Yes.

  The syringe body 10 is made of, for example, synthetic resin or glass. The syringe body 10 has a hollow body portion 11 (cylindrical in the present embodiment) that can be filled with a content liquid (for example, nasal drops) M. The body portion 11 has a body portion 11 through a shoulder portion 12. The tip portion 13 having a smaller diameter than the portion 11 is integrally connected. A through hole 14 is formed inside the distal end portion 13. In addition, a protrusion 15 is provided at the rear end of the body 11 so as to protrude outward from the outer peripheral surface of the body 11 in the radial direction (direction perpendicular to the central axis O of the metered syringe injector 1). .

  The nozzle 20 has a nozzle body 21 that is detachably fitted to the tip end portion 13. A nozzle tip 22 is built in the nozzle body 21. Further, a nozzle outlet 23 communicating with the nozzle tip 22 is formed at the distal end side of the nozzle body 21.

  In this embodiment, the holder 30 is made of a synthetic resin. The holder 30 extends outward in the radial direction and has a plate-like finger hook portion 31 having a concave portion 31a for accommodating and holding the protrusion 15 therein, and an inner edge of the finger hook portion 31 to the nozzle body 21. And a cylindrical tube body 32 extending in the reverse direction (rear). In addition, as for the finger hook part 31, the circumferential direction part is notched and this is connected with the recessed part 31a. Thereby, the holder 30 is attached to the syringe body 10 so as to slide from the radially outer side to the inner side.

  The inner peripheral surface 32 a of the cylinder main body 32 is provided so as to be continuous with the inner peripheral surface 10 a of the syringe main body 10, and substantially extends the entire length of the syringe main body 10. That is, in this embodiment, the inner peripheral surface of the syringe 2 is formed by the inner peripheral surface 10 a of the syringe main body 10 and the inner peripheral surface 32 a of the tube main body portion 32. Further, the inner diameter of the inner peripheral surface 32a in the present embodiment is substantially equal to or slightly larger than the inner peripheral surface 10a of the syringe body 10.

  On the rear end side of the tube main body portion 32, a reduced diameter portion 33 that protrudes radially inward from the inner peripheral surface 32a and has an inner diameter smaller than the inner diameter of the inner peripheral surface 32a is provided. The reduced diameter portion 33 of the present embodiment is provided over the entire circumference of the inner peripheral surface 32a, but intermittently by dividing at least one place in the circumferential direction (direction around the axis O). It may be formed.

  The plunger main body portion 40 includes a screw-like tip portion 41 provided on the tip side thereof, and a rod portion 42 that is integrally connected to the tip portion 41 and extends toward the rear side. The rod portion 42 in the present embodiment is a vertically long combination of disc-shaped disks 42a and 42b arranged on the front end side and rear end side thereof, and a cross-shaped cross section that integrally connects the disks 42a and 42b. The four plate portions 42c.

  Here, a piston (gasket) P is held by the distal end portion 41 on the distal end side of the plunger main body portion 40. Piston P consists of elastic materials, such as rubber | gum, for example, and contact | abuts to the internal peripheral surface 10a of the syringe main body 10 so that sliding is possible. A filling space S for filling the content liquid M is formed between the piston P and the syringe body 10.

  On the rear end side of the plunger main body portion 40, a shaft 43 that is integrally connected to the central portion of the disk 42b is provided. As shown in FIG. 2, the shaft 43 has a large-diameter portion 43a having substantially the same diameter as the plate portion 42c, and a small-diameter portion 43b having a smaller diameter than the large-diameter portion 43a. The shaft 43 is formed with a recessed surface 43c that is recessed in a flat manner from the large diameter portion 43a to the small diameter portion 43b at positions opposite to each other across the axis O. Further, the small-diameter portion 43b is formed with an annular groove 43d that circulates around the axis O on the rear end side. By forming the annular groove 43d in the small diameter portion 43b, a head 43e is formed at the rear end of the shaft 43. The head 43e has an inclined surface 43f that tapers from the front end side toward the rear end side.

  The disk 42b is integrally provided with two elastic arms 44 at positions facing the shaft 43 (position facing the recessed surface 43c). The elastic arm 44 is formed in a flat plate shape and extends along the axis O from a fixed end 44a integrally connected to the disk 42b. When an external force toward the distal end is applied to the rear end portion of the elastic arm 44, the elastic arm 44 bends inward (direction approaching the axis O) from the initial position shown in FIG. 1 and releases the external force. Thus, the initial position is restored from the fixed end 44a. In the present embodiment, the elastic arm 44 is formed with a thickness that is easily bent and easily restored.

  The elastic arm 44 has a protrusion (sliding protrusion) 45 that protrudes toward the inner peripheral surface 32 a of the holder 30 (projects radially outward). The outer diameter of the sliding protrusion 45 is set to be larger than the inner diameter of the reduced diameter portion 33. Further, the sliding protrusion 45 has an inclined surface 45 a that tapers toward the fixed end 44 a of the elastic arm 44. With such a configuration, when the plunger main body 40 is pushed into the holder 30, the inclined surface 45a contacts the rear end 32b of the holder 30 as shown in FIG. 1 to induce inward bending of the elastic arm 44. Therefore, the elastic arm 44 can easily enter the holder 30. Further, when the plunger main body 40 is pushed into the holder 30, the sliding projection 45 abuts against the reduced diameter portion 33 so as to be slidable.

  Further, as shown in FIG. 2, the elastic arm 44 has a protrusion (locking protrusion) 46 that is integrally connected to the rear end portion thereof and protrudes radially outward. The locking protrusion 46 is provided on the rear end side of the sliding protrusion 45 and with a gap with respect to the sliding protrusion 45. The outer diameter at the radially outer end of the locking projection 46 is larger than the inner diameter of the reduced diameter portion 33 in a state where the sliding projection 45 is in contact with the reduced diameter portion 33 as shown in FIG. Is set to Thereby, when the plunger main body 40 is pushed into the holder 30, the locking projection 46 is locked to the rear end 32 b of the holder 30.

  Here, the free end 44b of the elastic arm 44 (the surface on the rear end side of the locking projection 46) is radially outward with respect to the surface (horizontal plane) F perpendicular to the axis O as shown in the enlarged view of FIG. As it goes, it is formed as a tapered surface inclined at an angle θ from the rear end side toward the front end side. For example, the angle θ is set so that the free end 44b is parallel to the horizontal line F when the elastic arm 44 is bent inward from the fixed end 44a. In addition, the value of θ can be changed as appropriate according to the size of the metered syringe type ejector 1 and the like.

  In addition, as shown in the enlarged view of FIG. 1, a step 47 is provided on the radially inner side of the locking projection 46. The step 47 is formed by a flat step bottom surface 47a extending in the horizontal direction and a step side surface 47b connected to the step bottom surface 47a. Further, the step side surface 47 b is formed as a tapered surface that is inclined radially outward from the step bottom surface 47 a toward the free end 44 b of the elastic arm 44.

  The plunger operation member 50 has a cylindrical main body 51 as shown in FIG. 2, and a disc-shaped operation portion 52 that is a part where the user directly presses a finger is integrated with the rear end of the main body 51. Is provided. An annular protrusion 53 that protrudes radially inward is provided on the inner peripheral surface of the main body 51. The inner diameter of the main body 51 is set to be equal to or slightly larger than the outer diameter of the small diameter portion 43b of the shaft 43, and the inner diameter at the radially inner end of the annular protrusion 53 is set to be equal to or greater than the outer diameter of the annular groove 43d. ing. Moreover, the axial direction length of the annular protrusion 53 is set to the following in the axial direction length of the annular groove 43d. Thereby, the plunger operating member 50 is slidably held with respect to the plunger main body portion 40 by inserting the shaft 43 into the main body 51. When the shaft 43 is inserted into the main body 51, the inclined surface 43f of the shaft 43 comes into contact with the annular protrusion 53 and induces the head 43e to get over, so that the assembling work is facilitated.

  The main body 51 has a notch 54 formed from the front end side to the rear end side. In the present embodiment, the elastic arm 44 is formed at two positions facing each other with the axis O therebetween. The notch 54 has a width slightly larger than the lateral width of the elastic arm 44, and the elastic arm 44 is operably accommodated to ensure movement of the elastic arm 44 along the radial direction.

  Further, the end portion on the rear end side of the notch 54 shown in FIG. 2 functions as a contact end portion 55 that abuts against the elastic arm 44 when sliding to the front end side. As shown in the enlarged view of FIG. 1, the contact end portion 55 is formed by a contact end surface 55 a that extends horizontally and a contact side surface 55 b that extends along the axis O. The abutting end surface 55a functions as a pressing surface having a stepped bottom surface 47a provided on the elastic arm 44 as a pressure receiving surface. That is, by applying a pressing force to the operation portion 52, the abutting end surface 55a presses the step bottom surface 47a of the plunger main body portion 40, whereby the plunger main body portion 40 can be pushed into the syringe main body 10. . The abutting side surface 55b can be restrained so that the elastic arm 44 does not fall inward in the radial direction when contacting the stepped side surface 47b of the elastic arm 44.

  Next, the usage method of the fixed_quantity | assay syringe type ejector 1 which becomes the structure mentioned above is demonstrated. First, in the state shown in FIG. 1 (FIG. 3A), the user places the index finger and the middle finger, for example, on the finger-hanging portion 31, and presses the operation portion 52 with the thumb to hold the quantitative syringe-type ejector 1. Then, when the plunger operating member 50 is pushed in with the thumb, the inclined surface 45a comes into contact with the rear end 32b of the holder 30, and the elastic arm 44 enters the cylinder body 32 while bending inward. At this time, since the plunger main body 40 pushed by the plunger operating member 50 pushes the piston P toward the tip side, the content liquid M in the filling space S passes through the through hole 14 and the nozzle tip 22. Are ejected from the ejection port 23 (first ejection starts).

  If the pressing to the plunger operating member 50 is continued, the plunger main body 40 is pushed toward the distal end side while the sliding protrusion 45 slides with respect to the reduced diameter portion 33. As shown in FIG. 3B, the plunger operating member 50 cannot be pushed in when the locking projection 46 of the elastic arm 44 comes into contact with the rear end 32b of the holder 30. The first ejection ends with the liquid M remaining. In this state, the elastic arm 44 is bent inward with the fixed end 44 a as a starting point, and the abutting end surface 55 a of the plunger operating member 50 is formed on the elastic arm 44 as shown in the enlarged view of FIG. 1. While contacting the step bottom surface 47a, the abutting side surface 55b is in a state of being accommodated inside the step side surface 47b. For this reason, the elastic arm 44 is restrained while being bent inward. Further, as shown in FIG. 2, since the shaft 43 is provided with a recessed surface 43c at a position facing the elastic arm 44, the shaft 43 does not interfere with the shaft 43 even when the elastic arm 44 is bent inward. . For this reason, a large deflection amount of the elastic arm 44 is ensured without increasing the radial dimension of the plunger operating member 50. Although not shown, for example, a step portion is formed by reducing the thickness between the intermediate portion and the tip portion of the reduced diameter portion 33, and slides on the step portion when the first ejection is completed. The protrusion 45 may be locked. In this case, since the plunger main body 40 does not move to the rear end side from the position where the first ejection is finished, an accurate ejection amount can be achieved.

  Next, when the pushing of the plunger operating member 50 is loosened or released, as shown in FIG. 4A, the fixed end 44a side of the elastic arm 44 is restrained by the sliding projection 45 that contacts the reduced diameter portion 33. Therefore, only the free end 44b side of the elastic arm 44 is deformed (restored) obliquely inward from the sliding protrusion 45 as a starting point. As a result, the locking projection 46 is displaced obliquely inward, and the locking state between the locking projection 46 and the rear end 32b is automatically released. As shown in the enlarged view of FIG. 1, the step side surface 47b is formed as a tapered surface. As a result, the stepped side surface 47b acts to push the abutting end portion 55 toward the rear end side when the elastic arm 44 is restored, so that the locked state is more reliably released. In addition, you may employ | adopt the structure which picks up the plunger operation member 50 with a finger | toe, and cancels | releases a latching state and pulls back to the rear end side.

  Then, when the plunger operating member 50 is pushed again from the state of FIG. 4A, the abutting end surface 55a presses the free end 44b, and the second ejection is possible. As shown in the enlarged view of FIG. 1, since the free end 44b of the elastic arm 44 is tapered at an angle θ, in the state where the free end 44b side of the elastic arm 44 shown in FIG. The free end 44b is in a state close to being parallel to the end face 55a. For this reason, pushing of the plunger main-body part 40 can be performed smoothly.

  When the plunger operation member 50 is pushed down to the end and the second ejection is completed (the state shown in FIG. 4B), the sliding protrusion 45 and the locking protrusion 46 are closer to the tip than the reduced diameter portion 33. To position. For this reason, the elastic arm 44 is restored toward the radially outer side, and the radially outer end of the locking projection 46 protrudes more radially outward than the inner peripheral surface of the reduced diameter portion 33 (the reduced diameter portion 33 and the inner diameter). Therefore, even if the plunger operating member 50 is pulled toward the rear end, the plunger main body 40 is prevented from being pulled back. That is, since it is not possible to refill the syringe body 10 with the content liquid, it is possible to prevent reuse of the quantitative syringe type ejector 1.

  FIG. 5 shows a metered syringe type ejector 100 which is a modification of the metered syringe type ejector 1 described above. The fixed quantity syringe type ejector 100 is configured such that the inner peripheral surface 32a of the cylinder main body portion 32 is reduced in diameter over the entire region, and the inner diameter thereof is smaller than the inner peripheral surface 10a of the syringe main body 10. That is, the inner peripheral surface 32 a of the tube main body portion 32 is the reduced diameter portion 33. Further, as shown in FIG. 5 (b), when the second ejection is finished, the sliding projection 45 is positioned on the distal end side with respect to the reduced diameter portion 33, and the locking projection 46 becomes the reduced diameter portion 33. In the abutting state, the radially outer end of the sliding projection 45 protrudes radially outward from the reduced diameter portion 33.

  Also in such a fixed quantity syringe type ejector 100, when the pushing of the plunger operating member 50 is loosened or released after the first ejection is completed, as shown in FIG. The locked state with the rear end 32b of 30 is automatically released, and the second ejection becomes possible. And as shown in FIG.5 (b), since the radial direction outer end of the sliding protrusion 45 will protrude outside a diameter reduction part 33 at the time of the end of the 2nd ejection, Even if the plunger operating member 50 is pulled toward the rear end side, the plunger main body 40 is prevented from being pulled back, so that reuse can be prevented.

  FIG. 6 is a view showing only a syringe body 10 and a holder 30A used for another embodiment of a metered syringe type ejector according to the present invention. In the present embodiment, the holder 30 </ b> A is configured to be attached to the syringe main body 10 from the rear end side toward the front end side, and the cylinder main body portion 32 extends along the inner peripheral surface 10 a of the syringe main body 10. The reduced diameter portion 33 is provided. Although not shown in the drawings, the plunger main body described above is arranged such that the sliding protrusion 45 or the locking protrusion 46 described above is positioned on the tip side of the reduced diameter portion 33 when the second ejection is finished. The length of the section 40 is changed as appropriate. Thereby, even in the present embodiment, the plunger main body 40 is prevented from being pulled back, so that reuse can be prevented.

  The metering syringe type ejector according to the present invention is not limited to the above-described embodiment, and various modifications are possible within the scope according to the claims. For example, in the embodiment described above, the protrusion of the elastic arm (sliding protrusion, locking protrusion) is moved to the distal end side rather than the end portion on the distal end side of the reduced diameter portion so that the pull back of the plunger is prevented. Although it is configured, a recess is provided in an intermediate portion in the length direction of the reduced diameter portion (a direction along the axis O), and the plunger is pushed in to restore the elastic arm when the protrusion of the elastic arm fits into this recess (the recess And the protrusion engage with each other), the plunger may be prevented from being pulled back. In addition, a stepped portion may be provided on the inner peripheral surface of the syringe body so that the rear end side protrudes radially inward from the tip end side, and this stepped portion may be a reduced diameter portion. Further, the holder 30 may not be provided with the cylinder main body portion 32, and the inner edge of the finger hook portion 31 may be protruded radially inward, and a protrusion may be engaged with the protrusion to prevent the plunger from being pulled back. Further, in the initial state (FIG. 1, FIG. 3A), an engaging portion that prevents the plunger from being pulled back may be provided. Further, the protruding portion of the syringe main body and the finger hooking portion of the holder may be omitted. In this case, for example, the outer peripheral surface of the syringe main body may be fitted and held on the inner peripheral surface of the holder. It is also possible to omit the shoulder and tip of the syringe body and to attach the nozzle directly to the barrel of the syringe body. In this case, since it can be formed by splitting the mold with the stepped portion as a boundary without forcibly removing the stepped portion from the mold, the manufacturing becomes easier. Further, in the above-described embodiment, the plunger is prevented from being pulled back by using the elastic arm having the sliding protrusion and the locking protrusion used when the contents are subdivided. An arm may be provided on the plunger main body, and the other arm may be hooked on the reduced diameter portion. Further, the plunger operating member extends from the rear end side to the front end side so that the shaft provided in the plunger main body and the through hole of the plunger operating member through which the shaft is inserted are interchanged. And a concave portion (hole) through which the shaft is inserted may be provided in the plunger main body.

  The present invention can be employed in various forms as long as it is a metering syringe type ejector provided with a syringe and a plunger that can be pushed into the syringe, and various liquid contents can be employed. it can.

DESCRIPTION OF SYMBOLS 1,100 Fixed-quantity syringe type ejector 2 Syringe 3 Plunger 10 Syringe main body 10a Inner peripheral surface 11 Body part 12 Shoulder part 13 Tip part 14 Through-hole 15 Protrusion part 20 Nozzle 21 Nozzle main body 22 Nozzle tip 23 Outlet 30 Holder 31 Finger hook Part 31a Concave part 32 Cylinder body part 32a Inner peripheral surface 32b Rear end 33 Reduced diameter part 40 Plunger body part 41 Tip part 42 Rod part 42a, 42b Disc 42c Plate part 43 Shaft 43a Large diameter part 43b Small diameter part 43c Recessed surface 43d Annular Groove 43e Head 43f Inclined surface 44 Elastic arm 44a Fixed end 44b Free end 45 Sliding protrusion (protrusion)
45a Inclined surface 46 Locking protrusion (protrusion)
47 Step 47a Step bottom 47b Step side 50 Plunger operation member 51 Main body 52 Operation part 53 Annular projection 54 Notch 55 Abutting end 55a Abutting end face 55b Abutting side M Content liquid P Piston S Filling space

Claims (4)

A fixed-quantity syringe-type ejector comprising a syringe and a plunger that is inserted from the rear end side of the syringe and pushes the piston by pressing the operation unit to eject the content liquid,
The plunger includes a plunger main body portion that pushes the piston, and an elastic arm that has a protrusion protruding toward the inner peripheral surface of the syringe and is coupled to the plunger main body portion.
By pushing the plunger into the inner peripheral surface of the syringe, the elastic arm is bent inward by abutting against the protrusion, and at the end of pushing the plunger, the elastic arm is restored to restore the plunger. A fixed-quantity syringe type ejector provided with a reduced diameter portion that prevents pullback.   The syringe has a hollow shape and a syringe body having a radially outward protrusion on the rear end side thereof, and an inner peripheral surface that is continuous with the inner peripheral surface of the syringe body on a finger-holding portion that is engaged and held by the protrusion 2. A metered syringe ejector according to claim 1, further comprising a holder connected to a cylindrical main body portion that forms a tube, and the reduced diameter portion is provided on an inner peripheral surface of the cylindrical main body portion.   The syringe has a hollow shape and a syringe body having a radially outward protrusion on the rear end side thereof, and an inner peripheral surface that is continuous with the inner peripheral surface of the syringe body on a finger-holding portion that is engaged and held by the protrusion 2. The quantitative determination according to claim 1, further comprising: a holder connected to a cylinder main body portion that forms the inner diameter surface of the cylinder main body portion, and reducing the diameter of the inner peripheral surface of the syringe main body from the inner peripheral surface of the syringe main body. Syringe type ejector. The syringe includes a syringe body having a hollow shape and a radially outward projecting portion on a rear end side thereof, and a holder in which a tube body portion is coupled to a finger hook portion engaged and held by the projecting portion, The metering syringe ejector according to claim 1, wherein the cylindrical main body portion is extended along the inner peripheral surface of the syringe main body to form the reduced diameter portion.

Images