JP2002282021A - Plunger and piercer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plunger which is prevented from falling out from a cylinder of the plunger and stably pushes out a loaded substance by a force being at least a specified value. SOLUTION: In a plunger 5 for pushing out the loaded substance in the cylinder by means of a pushing head 31 by applying a force on a plunger tail 32, a part 34 for preventing the plunger from falling out and a part 35 for resisting to pushing in are provided. The part 34 for preventing the plunger from falling out is a thin sheet part extending in the vertical direction around a plunger shaft 33a. The part 35 for resisting to pushing in is located to the plunger tail 32 side from the part 34 for preventing the plunger from falling out and is extended in the vertical direction around the shaft 33a and in a thin sheet-like shape and larger than the cylinder diameter and is brought into contact with the outer face of the peripheral edge face of an inserting opening for the plunger of the cylinder and is broken when a force loaded on the plunger tail 32 becomes to a specified value or larger to push out the loaded substance by a force of a specified force or larger.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plunger and a piercer for pushing out a load in a cylinder.

[0002]

2. Description of the Related Art There are various types of plungers for pushing an object loaded in a cylinder. For example, Japanese Utility Model Laid-Open No. 4-89014 discloses a plunger for pushing out a piercing needle used for a piercer. In the plunger described in the above-mentioned publication, a thin tongue piece having a thickness substantially equal to the diameter of the shaft is provided on the shaft of the plunger so as to protrude in the diameter direction of the shaft. The tongue has two functions, one is a stopper function to prevent the plunger from entering the inside of the cylinder before use, and the other is that the tongue is located between the end face of the cylinder and the cylinder. Until the tongue is cut, the piercing needle immediately penetrates the earlobe until the tongue is cut, so that the pain of perforation is reduced as much as possible until the momentum is large enough to be cut.

As described above, in a plunger used for a piercer or the like, it is necessary to push out a load with a force larger than a predetermined magnitude, and a mechanism for that has been studied as described above.

[0004]

However, in the technique disclosed in the above-mentioned utility model publication, the tongue piece protruding from the shaft of the plunger did not prevent the plunger from falling off the cylinder. Also, when the plunger is pushed out to push out the piercing needle, the plunger is easy to move in the cylinder in the direction perpendicular to the axis and is easy to wobble,
The plunger could not be pushed into the cylinder stably.

The present invention has been made in view of such circumstances, and aims at preventing the plunger from falling off the cylinder and stably loading the load with a force of a predetermined magnitude or more. To provide a plunger to extrude.

[0006]

In order to achieve the above object, a plunger having a plunger shaft with a drop-off preventing portion and a pushing resistance portion is provided.

More specifically, the invention according to claim 1 is a plunger for pushing out a load in a cylinder, wherein the plunger contacts the load by advancing and pushes the load out of the cylinder. A plunger tail that is protruding and can be applied with an external force to advance the extrusion head; a plunger shaft connecting the extrusion head and the plunger tail; And a push-in resistance portion for keeping the plunger stationary with respect to the cylinder until the external pushing force applied to the plunger tail is greater than or equal to a predetermined value. Is a thin plate-shaped portion that extends in the vertical direction of the plunger shaft, and the push-in resistance portion is It is located closer to the plunger tail than the stop portion, and extends in a thin plate shape around the plunger shaft in the direction perpendicular to the plunger shaft to be larger than the inner diameter of the cylinder. The plunger is characterized in that the plunger is broken when the force for pushing the plunger on the plunger tail into the cylinder exceeds a predetermined value in order to push out the plunger with a predetermined force or more.

According to the structure of the present invention, since the drop-out preventing portion is provided, the extruding head portion of the plunger is first inserted into the cylinder to complete the preparation for pushing out the load. At the same time, the plunger is prevented from wobbling in the cylinder when the plunger is pushed in because the plunger is in contact with the inner wall of the cylinder.

Further, since there is also provided a push-in resistance portion which is broken when the force for pushing the plunger into the cylinder exceeds a predetermined value, the load can be pushed out with a force of a predetermined value or more.

Next, according to a second aspect of the present invention, in the first aspect, the push-in resistance portion extends around the plunger axis in a disk shape in a direction perpendicular to the plunger axis so as to be larger than the cylinder inner diameter. A plunger having a defective portion on an outer peripheral portion to reduce sliding resistance with an inner wall of a cylinder after being damaged by a force greater than a magnitude.

According to the structure of the present invention, since the push-in resistance portion has a deficient portion, the damaged portion of the push-in resistance portion after the damage is gathered in the deficient portion and the sliding resistance with the inner wall of the cylinder can be reduced. The load can be pushed out without loss of power. Further, it has a simple structure and is easy to manufacture.

Next, the invention according to claim 3 is the invention according to any one of claims 1 and 2, wherein the load is a piercing needle, and the cylinder into which the piercing needle is loaded and the piercing needle are pushed out toward the stopper. A piercer having the plunger described.

[0013] The stopper here is an instrument which is fitted to the sharp side of the piercing needle to fix the piercing needle to the body.

According to the structure of the present invention, when piercing the body using the piercing device of the present invention, the pain caused at the time of piercing can be minimized.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1A is a front view of the first main body 1. The first main body 1 includes a first base plate 50 in which the upper part of an egg is obliquely chipped and depressed, and the base plate 5
The first base plate 50 and each part provided integrally with the first base plate 50 so as to stand on the top. A cartridge mounting portion 18 for mounting the piercing needle cartridge 6 is provided above the oval-shaped uppermost portion, which is obliquely chipped and depressed. Reference numeral 5 denotes a plunger for pushing out a piercing needle, and a piercing needle cartridge 6 is a cylinder. On the lower side of the oval shape of the first base plate 50, a first rotating shaft 11 and three holes 13 used for connection with the second main body, and the separating cylinder 1
9 are provided. The first rotating shaft 11 is a small-diameter cylinder rising from the first base plate 50. The isolation cylinder 19 is a large-diameter cylinder rising from the first base plate 50 and is concentric with the first rotation shaft 11. The three holes 13 are formed in the first base plate 50 at equal intervals in the circumferential direction inside the isolation cylinder 19.

Then, a first contact portion 3 is provided between the cartridge mounting portion 18 and the separation column 19.

A return spring 10 formed by bending a flat plate and turning the numeral 2 upside down is provided with the upper part of the numeral 2 coupled to the separating column 19. The lower part of the return spring 10 in the shape of the numeral 2 projects outside the first base plate 50 (left side in the figure). On the other hand, on the peripheral portion of the first base plate 50 on the right side of the figure, a first side wall 15 is provided so as to rise from the first base plate 50. The first side wall 15 is provided from the cartridge mounting portion 18 to a little less than half the circumference of the first base plate 50.

FIG. 1B is a rear view of the second main body 2. The second main body 2 is composed of a second base plate 60 having a shape similar to a magatama, and components provided integrally with the second base plate 60 so as to stand on the base plate 60. . The tip of the tail-shaped portion of the magatama (upper part in the figure) is a stopper mounting portion 9 to which the stopper 8 is mounted. A second rotating shaft 12 and three engaging claws 14 are provided on the circular head opposite to the tail portion of the magatama. Second rotating shaft 12
Is a column rising from the second base plate 60 at the center of the circular head of the second base plate 60. Engaging claw 14
Are raised from a portion near the peripheral edge of the second base plate 60, and a claw is formed at a tip thereof.
Reference numeral 4 is equidistant from the second rotating shaft 12, and the engaging claws 14 are also equidistant.

On the right side of the peripheral portion of the second base plate 60 in the figure, a second side wall 16 is provided so as to rise from the second base plate 60. The second side wall 16 is provided from the fastener mounting portion 9 to a little less than half the circumference of the second base plate 60.

Then, the stopper mounting portion 9 and the second rotating shaft 1
2, a return spring regulating wall 17 is provided. The return spring restricting wall 17 is opposed to the second base plate 60 facing the second side wall 16 so as to divide the portion where the stopper mounting portion 9 is located and the portion where the second rotary shaft 12 is located. It is provided so as to stand up from the second base plate 60 up to the peripheral edge on the side. A second contact portion 4 is provided at the left end of the spring regulating wall 17 in the drawing, and projects outward from the second base plate 60.

Next, the connection and operation of the two main bodies will be described.

The second main body 2 is turned over from the state shown in FIG. 1B and is connected to the first main body 1 shown in FIG. 1A. The connection is performed by inserting a cylinder serving as the first rotation shaft 11 inside the cylinder serving as the second rotation shaft 12, and engaging the engaging claws 14 of the second main body 2 with the holes 13 of the first main body 1. Is completed. FIG. 2 is a cross-sectional view taken along line AA of FIG. The claw portion 20 of the engaging claw 14 is
Is engaged. In addition, since the length of the hole 13 along the inner circumference of the isolation cylinder 19 is longer than the width of the engagement claw 14, the engagement claw 1
4 moves in the hole 13 in the length direction, the first main body 1 and the second main body 2
It can be rotated and moved around 1 and 12. Here, the first main body 1 and the second main body 2 are separated by the isolation cylinder 19.
It is held at a distance corresponding to the height of the isolation cylinder 19.

FIG. 3 is a view of the piercing device in which the two main body portions are connected and the piercing needle cartridge 6 and the stopper 8 are separated from each other. Return spring 10
Of the second main body 2 interferes with the second side wall 16 of the second main body 2, so that the two main bodies are brought closer to each other so as to bring the cartridge 6 and the stopper 8 closer to each other. Unless it is applied, the cartridge 6 and the stopper 8 do not approach each other. In addition, since the tip of the return spring 10 and the return spring regulating wall 17 interfere with each other, unless the force in the direction of opening the two main bodies is applied so as to further separate the cartridge 6 and the stopper 8 from each other, this state is not satisfied. Is held.

When a piercer in a state where the cartridge 6 and the stopper 8 are separated from each other is put on a palm and a force is applied to the first side wall 15 and the second side wall 16, the two main body parts rotate. The cartridge 6 and the stopper 8 are closed so as to rotate about the shaft 11 so as to approach each other. FIG. 4 shows a state in which closing and preparation for punching are completed.

When the preparation for punching is completed, the second abutment 4 is fitted into the first abutment 3 and these serve as stoppers, so that the cartridge 6 and the stopper 8 cannot be further approached. ing. In this state, the return spring 10 is pressed by the second side wall 16 and deformed. This state cannot be maintained unless the force for closing the two main bodies is continuously applied.

Next, the plunger will be described.

FIG. 5 is a perspective view of the plunger. The tip of the plunger 5 on the pushing side is a cylindrical pushing head 31 having a diameter slightly smaller than the inside diameter of the piercing needle cartridge which is a cylinder. The tip surface of the extrusion head 31 is recessed so that the piercing needle can be pushed out stably, and the contact area of the piercing needle with the decoration head is increased. The cylindrical edge of the extrusion head 31 is rounded and rounded. On the opposite side of the plunger 5 from the extrusion head 31 is a plunger tail 32 to which an external pushing force is applied so as to advance the extrusion head 31. The plunger tail 32 is formed at the rear end of the shaft 33b, and extends circularly in the vertical direction of the shaft 33b. The plunger tail 32 always projects to the rear end of the cylinder when the extrusion head 31 is inserted into the cylinder. In the case of the present embodiment, since the pushing force from the outside is a pushing force by a human finger, the diameter is 5 to 5 so that the plunger tail 32 can stably abut against the belly of the finger and push the plunger 5 easily. About 20 mm is preferable. Further, it is preferable to provide a non-slip projection or the like on the outer surface that comes into contact with the finger.

Behind the extruding head 31, there is provided a tongue-shaped slip-off preventing portion 34. Drop-off prevention unit 34
Is a thin plate-shaped portion provided around the shaft 33a and slightly wider than the diameter of the shaft 33a and expanding in the vertical direction of the shaft 33a. The major axis of the falling-off preventing portion 34 is slightly larger than the cartridge inner diameter. Thus, when the plunger 5 is inserted into the cartridge, the tip of the drop-off preventing portion 34 comes into contact with the inner wall of the cartridge, and the friction prevents the extrusion head 31 from dropping out of the cartridge.

On the side closer to the plunger tail 32 than the drop-off preventing portion 34, a substantially disk-shaped push-in resistance portion 35 is provided. The push-in resistance portion 35 extends around the shaft 33a in a circular thin plate shape in a direction perpendicular to the shaft 33a,
Its diameter is larger than the inner diameter of the cartridge which is a cylinder. A part of the push-in resistance portion 35 includes a shaft 33 from the outer peripheral portion.
There is provided a defective portion 36 reaching to a. The cutout portion 36 is a portion in which the push-in resistance portion 35 is cut out with a width of about ３ of the diameter of the shaft 33a. The width of the missing portion 36 is
It is preferably 1/2 to 1 times the diameter of 3a.

FIG. 7A is a sectional view of the piercing needle cartridge 6 which is a cylinder, and FIG. 7B is a view of the piercing needle cartridge 6 as viewed from the insertion opening side of the plunger. The lower portion of the cartridge 6 is a T-shaped insertion portion 6a for mounting on a piercer, and a corresponding T-shaped groove is formed in the cartridge mounting portion of the first main body.
Further, two grooves 6b are provided up and down in the cylindrical portion of the cylindrical portion of the cartridge 6 to make it easy to insert the plunger drop-out preventing portion. The inner diameter of the cartridge 6 is the diameter of the cylindrical inner wall 41 portion. 42 is a claw for supporting the piercing needle, and 6c is a fragile portion. Also, 43
Is the outer peripheral surface of the insertion opening peripheral portion.

FIG. 8 shows a plunger inserted into a piercing needle cartridge. As for the piercing needle 7,
2, the decorative head portion is loaded into the cartridge 6 such that the decorative head portion contacts the extrusion head 31 of the plunger 5. On the other hand, in the plunger 5, the push-out head 31 and the falling-off preventing portion 34 are inserted into the cartridge 6. Since the major axis of the drop-out preventing portion 34 is slightly larger than the inner diameter of the cartridge 6, the shaft of the plunger 5 is rotated by rotating the shaft of the plunger 5 when inserting in the state of FIG. It is preferable that the distal end be brought into contact with the inner wall 41 so that the plunger 5 does not fall off, because it is easy to insert. The push-in resistance portion 35 is in contact with the outer peripheral surface 43 of the insertion opening peripheral portion of the cartridge 6.

In this state, when the plunger tail 32 is pushed so as to advance the plunger 5, the pushing resistance portion 35 comes into contact with the outer peripheral surface 43 of the insertion opening before the pushing force reaches a predetermined magnitude. Therefore, it is still in this state. When the pushing force exceeds a predetermined value, the pushing resistance portion 35 is broken, the plunger 5 is pushed into the cartridge 6, and the piercing needle 7 is pushed out of the cartridge 6. The push-in resistance portion 35 has a disc shape but has a deficient portion. Therefore, when the push-in resistance portion 35 is broken and broken, the broken portion of the push-in resistance portion 35 moves toward the missing portion. . Here, the push-in resistance part 3
Assuming that there is no defective portion in the cartridge 5, the frictional force between the damaged portion and the inner wall 41 of the cartridge is large, the pushing force of the piercing needle 7 is reduced due to the frictional force, and the pain at the time of perforation increases. On the other hand, when there is a missing portion as in the present embodiment,
Since the damaged portion moves toward the defective portion, the frictional force between the damaged portion and the inner wall 41 of the cartridge is reduced, the force for pushing out the piercing needle 7 is sufficiently large, and the pain at the time of perforation is small.

The plunger shaft is thinner on the extrusion head 31 side and thicker on the plunger tail 32 side. The reason why the plunger shaft is thinner on the side of the extrusion head 31 is that the push resistance portion 35 has a shape greatly expanded from the shaft, so that the slide resistance with the cartridge inner wall 41 can be reduced after the push resistance portion 35 is broken. Because you can. Also,
The reason why the plunger shaft is thicker on the plunger tail 32 side is to prevent the plunger shaft from bending or breaking when a strong pushing force is applied.

When the piercing needle 7 is pushed out, the fragile portion 6c
Is broken to open the claw 42, and the piercing needle 7 comes out of the cartridge 6.

Next, the piercing needle and the stopper will be described.

FIG. 6 shows the piercing needle 7 and the stopper 8. The piercing needle 7 is loaded in a piercing needle cartridge. The decorative head 7a is pushed by the plunger, and the sharp portion 7c pierces a part of the body and pierces it. And
The sharp portion 7c of the piercing needle 7 protruding to the opposite side of the body is inserted into the hole 8c of the stopper 8, and pushes and spreads the holding portion 8b. Then, the small diameter portion 7d of the piercing needle 7 is
The piercing needle 7 is fixed to the stopper 8. Note that 7
b is a needle part penetrating the body, and 8a is a front plate of the stopper 8 which is in contact with the body. The piercing needle 7 and the stopper 8
Is an example, and the shape of the piercing needle itself, the shape of the decorative head, the shape of the stopper, and the like are not limited to this example. Further, the stopper may be made of resin.

This embodiment is one example, and the present invention is not limited to this embodiment. The shape of each part such as the shape of the cylinder and the plunger and the shape of each part such as the dropout prevention part and the push-in resistance part is not limited to this embodiment. For example, the shape of the falling-off preventing portion may be a circle, an ellipse, a rectangle, or the like. Further, the cutout portion is not only formed by notching the push-in resistance portion in parallel, but may be a cutout extending radially from the axis, or a cutout extending closer to the axis. Further, two or more missing portions may be provided. Two or more drop-off preventing portions may be provided.

[0039]

The present invention is embodied in the form described above, and has the following effects.

The presence of the drop-out prevention portion and the push-in resistance portion, which extend vertically from the plunger shaft, can prevent the plunger from falling out of the cylinder, and can push out the load with a force of a predetermined magnitude or more. Extrusion with a large force is possible. Further, the structure is simple and the manufacture is easy.

[Brief description of the drawings]

1A is a front view of a first main body, and FIG. 1B is a rear view of a second main body.

FIG. 2 is a sectional view taken along line AA of FIG. 1 (b).

FIG. 3 is a view of the piercer in a state where the piercing needle cartridge and the stopper are separated from each other.

FIG. 4 is a view of the piercer in a state in which the piercing needle cartridge and the stopper approach each other and preparation for piercing is completed.

FIG. 5 is a perspective view of a plunger.

FIG. 6 is a view of a piercing needle and a stopper.

FIG. 7A is a fragmentary sectional view of a cartridge, and FIG.

FIG. 8 is a view in which a plunger is inserted into a cartridge.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st main-body part 2 2nd main-body part 3 1st contact part 4 2nd contact part 5 plunger 6 Pierce needle cartridge 7 Pierce needle 8 Stopper 9 Stopper mounting part 10 Return spring 11 First rotation Shaft 12 Second rotating shaft 13 Hole 14 Engagement claw 15 First side wall 16 Second side wall 17 Return spring regulating wall 18 Cartridge mounting part 19 Separation cylinder 20 Claw part 31 Extrusion head 32 Plunger tail 33a shaft 33b axis 34 drop-out prevention part 35 push-in resistance part 36 defect part 41 inner wall 42 claw 43 outer peripheral surface of plunger insertion opening peripheral part 50 first base plate 60 second base plate

Claims (3)

[Claims] 1. A plunger for pushing out a charge in a cylinder, comprising: an extrusion head for contacting the charge by advance and pushing the charge out of the cylinder; and an external force protruding rearward of the cylinder to advance the extrusion head. A plunger tail connecting the extrusion head and the plunger tail, a drop-out preventing portion provided on the plunger shaft and in contact with the cylinder inner wall to prevent the extrusion head from dropping out of the cylinder; and a plunger. A push resistance portion that keeps the plunger stationary with respect to the cylinder until the external pushing force applied to the tail is greater than or equal to a predetermined value; and the dropout prevention portion is a thin plate that extends in the vertical direction of the plunger shaft. The push-in resistance part is located closer to the plunger tail side than the drop-out prevention part. Placed around the axis of the plunger in a thin plate in the vertical direction of the axis, which is larger than the inner diameter of the cylinder, and abuts against the outer peripheral surface of the plunger insertion port of the cylinder
A plunger characterized in that the extrusion head pushes out a load with a force greater than a predetermined amount, and is broken when the force for pushing the plunger on the plunger tail into the cylinder exceeds the predetermined amount. 2. The push-in resistance portion according to claim 1, wherein the push-in resistance portion extends around the plunger shaft in a disk shape in a direction perpendicular to the plunger shaft and is larger than the cylinder inner diameter.
A plunger having a defective portion on an outer peripheral portion to reduce sliding resistance with an inner wall of the cylinder after being broken by a force greater than or equal to the predetermined magnitude. 3. A piercing device comprising: a piercing needle as a load; and a cylinder into which the piercing needle is loaded and a plunger according to claim 1 for pushing the piercing needle toward a stopper.