JP2018038933A - Liquid measuring tool, liquid measuring method, and dilution method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid measuring tool capable of uniform fixed volume measurement with a simple structure and also contributing to reduction in manufacturing cost.SOLUTION: A syringe 1 comprises a syringe cylinder 3 having a finger hooking part 6, and a plunger 4. The plunger 4 is integrally provided with an adapter 5 having a projecting piece 5b. (a) First, test water 8 of a rough quantity exceeding a target quantity X is sucked by pulling the plunger 4 (a). (b) Afterwards, the syringe cylinder 3 and the plunger 4 are relatively rotated in an axial rotation direction so that the projecting piece 5b is opposed to the finger hooking part 6, and (c) the plunger 4 is pushed until the projecting piece 5b abuts on the finger hooking part 6. A height h of the projecting piece 5b is set at a length such that the test water of the target quantity X remains in the syringe cylinder 3. When the projecting piece 5b abuts on the finger hooking part 6, the test water of the target quantity (a predetermined quantity) is held in the syringe cylinder 3. An operator has only to create a state in which the projecting piece 5b abuts on the finger hooking part 6 without visually checking and caring about scale on the syringe cylinder 3.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a liquid measuring tool, a liquid measuring method, and a dilution method.

All analyzers have a measurable concentration range that cannot be analyzed below or above that concentration range. When the concentration of the analysis target solution (test solution) is high, the analysis can be performed by diluting the solution into the measurable concentration range.
In the area of precision analysis, the above dilution work is very troublesome because it uses a lot of nerves, but in the area of simple analysis, the accuracy up to that point is not required, and an approximate value is often obtained quickly on the spot. Is real.

When obtaining an approximate value, conventionally, for example, a graduated cylinder is used to measure while looking at a scale, and the measured test solution is diluted in a separately prepared diluent. Although an expensive micropipette (push button type liquid microvolume meter) may be used as this type of liquid measuring instrument, the work process after the measurement is the same as described above.
In weighing while looking at the scale, human sensation intervenes, so inhomogeneity for each weighing due to visual error cannot be avoided.

In order to suppress errors due to human sense as much as possible, a configuration has been proposed in which a stopper mechanism mechanically fixes the plunger suction position and the injection position with respect to the syringe body (for example, Patent Document 1).
More specifically, a guide bar extending in the axial direction of the syringe body is provided, the guide bar is slidably inserted into a guide holder integrated with the syringe body, and a stopper is screwed to the guide bar.
A suction position or an injection position is defined by the stopper coming into contact with the guide holder. By changing the position of the stopper, the suction position and the injection position can be arbitrarily set.

  Since quantitative measurement can be performed with mechanical contact by a stopper instead of visual observation, errors (ambiguity) due to human senses can be eliminated.

JP-A-10-104129

  However, the prior art described in Patent Document 1 requires a structure in which a slide mechanism using a guide bar and a stopper are screwed to the guide bar, and the structure is complicated and an increase in manufacturing cost cannot be avoided.

The present invention has been made in view of such a current situation, and an object thereof is to provide a liquid measuring instrument that can perform uniform quantitative measurement with a simple configuration and contribute to a reduction in manufacturing cost.
Another object of the present invention is to provide a liquid light weight method capable of uniform quantitative measurement with a simple configuration and a method for diluting the measured liquid.

  In order to achieve the above object, the present invention provides a stopper configuration that regulates quantification using a rotational configuration around a relative axial center that is inherently present, such as the relationship between a syringe body and a plunger in a syringe, for example. Decided to build.

Specifically, a liquid metering device according to the present invention includes a cylindrical liquid storage member having a suction port on a distal end side, a sliding member provided so as to be slidable in the axial direction within the liquid storage member, A projecting member provided on one of the liquid containing member and the sliding member and extending in the axial direction; and a receiving member provided on the other of the liquid containing member and the sliding member. The projecting member and the receiving member are opposed to each other at a predetermined rotational position in a direction around the axis of at least one of the liquid storage member and the sliding member, and contact with each other by movement of the sliding member. A predetermined amount of liquid storage space is formed on the tip side of the liquid storage member by contact.
In a state where the sliding member is moved to the tip of the liquid containing member at a position where the protruding member and the receiving member do not face each other (does not interfere), the liquid is roughly sucked over a predetermined amount (target amount), and then the liquid containing member And at least one of the sliding members is rotated around the axis and set to a predetermined rotational position so that the projecting member and the receiving member are opposed to each other, and the sliding member is moved to a position where the projecting member and the receiving member contact each other. , The excess amount is discharged and a predetermined amount of liquid remains in the liquid storage member.
Since the rotation configuration in the direction around the axis between the liquid storage member and the sliding member, which is originally present, is used as an element of the stopper configuration, the stopper configuration can be simplified.

The protruding member may include a mounting portion that is mounted on one of the liquid storage member and the sliding member, and a protruding piece that is provided integrally with the mounting portion and protrudes in the axial direction. Good.
For example, if the mounting portion is configured to be press-fitted into the liquid storage member or the sliding member, the protruding member can be formed by a one-touch operation.

The protruding piece has a stepped shape that is different in the axial direction at a position where the protruding piece comes into contact with the receiving member, and the receiving member has a first contacting portion with which a protruding portion of the protruding piece comes into contact, It is good also as a structure which has a 2nd contact part which the part with a large protrusion amount passes, and has a 2nd contact part to which a part with a small protrusion amount contact | abuts the part with a large protrusion amount, and can change the said predetermined amount arbitrarily. .
Different target amounts can be quantitatively weighed with one liquid measuring instrument, and convenience can be improved.

The projecting member may include a plurality of projecting pieces having different projecting amounts in the axial direction, and the predetermined amount may be arbitrarily changed by changing the projecting pieces facing the receiving member. .
Different target amounts can be quantitatively weighed with one liquid measuring instrument, and convenience can be improved.

The liquid storage member may be a syringe cylinder, the sliding member may be a plunger, and the receiving member or the protruding member may be a finger hook provided on the syringe cylinder.
A stopper configuration for quantitative measurement can be further simplified by using a finger hook portion originally provided on the syringe cylinder as the receiving member or the protruding member.

Further, the present invention provides a liquid using a liquid measuring instrument having a cylindrical liquid storage member having a suction port on the distal end side, and a sliding member provided to be slidable in the axial direction in the liquid storage member. In the measuring method, after the sliding member is moved to the rear end side of the liquid storage member and a liquid exceeding a predetermined amount is sucked into the liquid storage member, the liquid storage member and the sliding member At least one of them is rotated about the axis thereof so that the axially projecting member and the receiving member, which are provided relatively to the liquid containing member and the sliding member, face each other, and then the sliding member is By moving the protruding member and the receiving member into contact with each other, the excessively sucked liquid is discharged, and the predetermined amount of liquid defined by the contact is left in the liquid storage member. And
Since the inherently rotatable configuration around the axis between the liquid storage member and the sliding member is used as an element of the stopper configuration, the stopper configuration can be simplified.

In addition, the present invention provides a dilution using a liquid measuring instrument having a cylindrical liquid storage member having a suction port on the distal end side and a sliding member slidably provided in the liquid storage member in the axial direction. In the method, after the sliding member is moved to the rear end side of the liquid containing member and a liquid exceeding a predetermined amount is sucked into the liquid containing member, at least of the liquid containing member and the sliding member One of them is rotated around the axis, and the projecting member and the receiving member, which are provided relatively to the liquid storage member and the sliding member and extend in the axial direction, are opposed to each other, and then the sliding member is moved. Then, the projecting member and the receiving member are brought into contact with each other, thereby discharging the excessively sucked liquid and leaving the predetermined amount of liquid defined by the contact in the liquid containing member. The sliding member is moved to the rear end side of the liquid containing member with the liquid remaining. Allowed to suck the diluent into the liquid accommodating member, characterized by diluting the predetermined quantity of liquid remaining in the liquid accommodating member at a predetermined ratio.
Since quantitative measurement and dilution of the liquid can be performed simultaneously in one liquid storage member, for example, the work efficiency of the analysis work can be improved. Since no other instruments are used for dilution, the cleaning operation after the dilution process is extremely easy.

According to the present invention, a uniform metering can be performed with a simple configuration, and a liquid meter that contributes to a reduction in manufacturing cost can be provided.
In addition, according to the present invention, uniform quantitative measurement can be easily performed with a simple configuration.
In addition, according to the present invention, quantitative measurement and dilution can be performed simultaneously with a simple configuration, the work efficiency can be improved, and the cleaning operation after the dilution process is extremely easy.

It is a side view of the liquid measuring instrument which concerns on the 1st Embodiment of this invention. It is a disassembled perspective view of the liquid measuring tool shown in FIG. It is a figure which shows the measuring method by the liquid measuring tool shown in FIG. 1, (a) is a side view which shows the state attracted | sucked exceeding a target amount, (b) makes the protrusion piece and finger-hooking part of an adapter after suction oppose FIG. 6C is a side view showing a state where a target amount of water is held in the syringe cylinder by pressing the plunger to bring the protruding piece into contact with the finger hooking portion. It is a figure which shows a dilution method, (a) is a side view which shows the state which moved the plunger from the state of FIG.3 (c) to the upper limit, sucked distilled water as a diluent, and was set as the predetermined dilution rate, (b) FIG. 3 is a side view showing a state in which diluted test water is discharged into a container. It is a principal part disassembled perspective view which shows the structure of the protrusion member which concerns on 2nd Embodiment. It is a principal part perspective view which shows the structure of the protrusion member which concerns on 3rd Embodiment. It is a perspective view of the liquid measuring instrument which concerns on 4th Embodiment with some omission. It is a figure which shows the measuring method by the liquid measuring tool which concerns on 4th Embodiment, (a) is a principal part side view in the state which contacted the part with the large protrusion amount of the axial direction of a protrusion piece, (b) is a shaft. It is a principal part side view of the state which contacted the part with the small amount of protrusions of a direction. FIG. 10 is a perspective view of a liquid measuring instrument according to a fifth embodiment with partial omission.

Embodiments of the present invention will be described below with reference to the drawings.
First, a first embodiment will be described with reference to FIGS.
FIG. 1 is a side view of a syringe as a liquid measuring instrument according to the present embodiment. The syringe 1 includes a syringe cylinder 3 as a cylindrical liquid storage member having a suction port 2 on the distal end side, a plunger 4 as a sliding member provided to be slidable in the syringe cylinder 3 in the axial direction, and a plunger 4 has an adapter 5 as a protruding member fixed to the rear end side (upper end side in the drawing), and a finger hook portion 6 as a receiving member that the syringe cylinder 3 is originally provided.
In this embodiment, a commercially available syringe 1 is used.

As shown in FIG. 2, the plunger 4 is fixed to the plunger rod 4 a having a clearance between the circumscribed circle and the inner surface of the syringe barrel 3, and the distal end portion (lower end portion in the drawing) of the plunger rod 4 a. 3 has a plunger main body 4b that slides in close contact with the inner peripheral surface of the cylinder 3, and a disk-shaped pressing plate 4c fixed to the rear end of the plunger rod 4a.
The plunger body 4b is in contact with the inner peripheral surface of the syringe cylinder 3 at two positions 4b-1 and 4b-2 that are spaced apart in the vertical direction, and the distal end position 4b-1 is printed on the outer surface of the syringe cylinder 3. This is a reference for reading the scale (not shown).
The syringe cylinder 3 and the plunger 4 are relatively rotatable in the direction around the axis and set so that the plunger body 4 b does not come out of the opening 7 at the rear end of the syringe cylinder 3.

The adapter 5 includes a mounting portion 5a that is press-fitted into the pressing plate 4c of the plunger rod 4a, and a protruding piece 5b that extends from the mounting portion 5a toward the distal end side in the axial direction of the syringe cylinder 3, and is integrated with a synthetic resin. Molded. The material of the adapter 5 is not limited to synthetic resin.
A mounting groove 5c (see FIG. 7) for mounting on the pressing plate 4c of the plunger 4 is formed in the mounting portion 5a.
The adapter 5 is integrally fixed to the plunger 4 by being pushed into the mounting portion 5 a so as to include the pressing plate 4 c of the plunger 4, and can be rotated synchronously with the plunger 4 with respect to the syringe cylinder 3.
If the mounting portion 5a is configured to be press-fitted into the pressing plate 4c of the plunger 4, the protruding piece 5b can be easily formed on the plunger 4 by a simple one-touch operation.
The flat surface portion of the finger-hanging portion 6 that protrudes in the horizontal direction serves as the first contact portion 6a and the second contact portion 6b with respect to the protruding piece 5b, and the contact with the protruding piece 5b may be performed either way.

FIG. 1 shows a position different from a relative predetermined rotational position between the syringe cylinder 3 and the plunger 4 in a direction around the axis, that is, a movement of the plunger 4 toward the distal end side of the syringe cylinder 3 and a protruding piece 5b 6 shows a state in which the plunger 4 has been moved to the tip of the syringe barrel 3 at a position where it does not face 6 (does not interfere).
In other words, the plunger 4 is set to a position where the suction amount is zero.
“Relative rotation” includes the case where the syringe cylinder 3 is fixed and the plunger 4 is rotated, the case where the plunger 4 is fixed and the syringe cylinder 3 is rotated, and the case where both are rotated simultaneously.

Based on FIG. 3, the measuring method of the test solution by the syringe 1 will be described. Here, the quantitative measurement and dilution of test water for water quality analysis will be described.
As shown in FIG. 3A, the suction port 2 of the syringe 1 in the state shown in FIG. 1 is inserted into the container 9 in which the test water 8 is stored, and the plunger 4 is pulled to suck the test water 8. In this case, the target amount (predetermined amount) is the position of X, but the suction is roughly performed so as to sufficiently exceed the target amount.
The internal volume of the syringe cylinder 3 in this embodiment is 1.5 ml, and the target amount X is 0.15 ml.

Next, as shown in FIG. 3B, the syringe 1 is separated from the container 9, and the syringe cylinder 3 and the plunger 4 are rotated relative to each other in the direction around the axis so that the protruding piece 5b of the adapter 5 and the finger hook 6 Are set at a predetermined rotational position where the two and the other face and interfere with the movement of the plunger 4 toward the distal end side of the syringe cylinder 3. The predetermined rotation position is a position where at least a part of the finger-hanging portion 6 comes into contact with the protruding piece 5b.
When the plunger 4 is pushed down in this state, as shown in FIG. 3C, the protruding piece 5b of the adapter 5 comes into contact with the finger hooking portion 6, and further movement of the plunger 4 is mechanically restricted.

The test water sucked in excessively until the protruding piece 5b of the adapter 5 comes into contact with the finger hook 6 is discharged from the suction port 2. The height h of the protruding piece 5b is set so that the target amount of the test water 8 remains in the syringe cylinder 3, and the protruding piece 5b comes into contact with the finger hook 6 without being aware of the scale of the syringe cylinder 3. By pushing the plunger 4 up to the target amount, the target amount of water to be detected can be held in the syringe cylinder 3.
In other words, a predetermined amount of liquid storage space is formed on the distal end side of the syringe barrel 3 by pushing the plunger 4 until the protruding piece 5 b comes into contact with the finger hook 6.
Accordingly, as long as the operation method is known, the target amount of water sample can be easily and uniformly measured in a groping state even in the dark. Even if the scale formed on the outer surface of the syringe cylinder 3 disappears due to use over time, it can be measured.

As described above, in the present embodiment, the finger hanger 6 that is inherently provided in the syringe barrel 3 is used as a constituent element of a stopper mechanism for performing quantitative suction, and the syringe barrel 3 and the plunger 4 are used. The stopper function is arbitrarily expressed by rotating it relatively in the direction around the axis.
For this reason, the simplification of the configuration can be greatly improved as compared with the conventional stopper mechanism described in Patent Document 1.
Of course, a receiving member different from the finger-hanging portion 6 may be separately formed on the syringe cylinder 3.

The above is the quantitative suction function of the syringe 1, but the syringe 1 according to the present embodiment can be used as a diluting tool as well as a liquid measuring tool. The dilution method will be described below.
As shown in FIG. 4 (a), a suction port is provided in a container 11 in which a diluted solution (distilled water) 10 is accommodated in a state in which the test water is quantitatively held in the syringe cylinder 3 shown in FIG. 3 (c). 2 is inserted, and the plunger 4 is moved to the upper limit position. That is, the plunger 4 is pulled as much as possible until the plunger body 4b comes into contact with the rear end of the syringe cylinder 3, and the distilled water 10 is sucked.
When the distilled water 10 is aspirated, the test water 8 previously held in the syringe cylinder 3 and the distilled water 10 are mixed while being agitated by the turbulent flow by the suction, and when the plunger 4 is pulled to the maximum, the syringe cylinder In FIG. 3, diluted test water having a dilution ratio of 10 is present. This diluted test water becomes a test water having a concentration within the measurement range of the analyzer.
Therefore, the syringe 1 as the liquid measuring tool in the present embodiment itself functions as a simple diluting tool.
If the volume of the syringe cylinder 3 is set so that the predetermined dilution ratio is obtained with the plunger body 4b being pulled to the maximum, test solutions with various dilution ratios can be easily obtained.

  After the dilution, as shown in FIG. 4B, the syringe cylinder 3 and the plunger 4 are relatively rotated in the direction around the axis, and the protruding piece 5 b of the adapter 5 does not face the finger-hanging portion 6 of the syringe cylinder 3. Set to position. Thereafter, the plunger 4 is pushed in until it abuts against the tip of the syringe cylinder 3, and is discharged (discharged) into the dedicated container 12 for storing diluted test water.

After the diluted test water is discharged, the inside of the syringe cylinder 3 must be cleaned with a cleaning liquid to prevent contamination. In this case, the suction port 2 is inserted into a container (not shown) containing the cleaning liquid. Then, the plunger 4 is pulled to the maximum to accommodate the cleaning liquid in the syringe cylinder 3 and then discharged.
In the present embodiment, since no other container is used for dilution, only the syringe 1 is to be cleaned, and the cleaning operation is facilitated.

  In the present embodiment, the existing (commercially available) syringe is used as it is as described above, and the adapter 5 having the protruding piece 5b is simply press-fitted and installed. It is possible to obtain a liquid measuring instrument capable of repeatedly performing quantitative weighing with a low cost and simple configuration, and a dilution tool capable of easily diluting about 10 times.

  Another embodiment will be described with reference to FIGS. The same parts as those in the above-described embodiment are denoted by the same reference numerals, and the description of the configuration and the function already described will be appropriately omitted unless particularly necessary.

FIG. 5 shows a second embodiment. In the present embodiment, a small diameter portion 4 d is formed at the rear end portion of the plunger 4. The adapter 13 integrally has a mounting portion 13a and a protruding piece 13b. The mounting portion 13a is formed with a fitting groove 13c that is elastically deformed to fit into the small diameter portion 4d. The adapter 13 in this embodiment does not need to rotate synchronously with the plunger 4 and may rotate independently. The single rotation of the adapter 13 is also included in “the rotation of the plunger relative to the syringe cylinder in the direction around the axis”.
The usage method for quantitative aspiration and dilution is the same as in the above embodiment (the same applies to the other embodiments below).

  FIG. 6 shows a third embodiment. In the present embodiment, a protruding piece-shaped protruding member 14 is formed integrally with the pressing plate 4 c of the plunger 4. In this way, since the protruding piece can be formed simultaneously with the molding of the plunger 4, the stopper configuration for obtaining the quantitative suction is further simplified.

7 and 8 show a fourth embodiment. As shown in FIG. 7, the adapter 5 in the present embodiment includes a protruding piece 5 b having a step shape that differs in the axial direction at a position where the adapter 5 abuts on the finger-hanging portion 6. That is, the protruding piece 5b is a first protruding piece 5b-1 that is a portion with a large amount of protruding in the axial direction, and a second portion that is a portion with a smaller protruding amount in the axial direction than the first protruding piece 5b-1. And a protruding piece 5b-2.
The first contact portion 6a of the finger hanging portion 6 is a contact portion with respect to the first protruding piece 5b-1, and the second contact portion 6b is a contact portion with respect to the second protruding piece 5b-2.
The second contact portion 6b is formed with a notch 6b-1 for allowing the first protruding piece 5b-1 to pass therethrough.

When the target amount is measured using the first projecting piece 5b-1, after roughly sucking so as to sufficiently exceed the target amount, the relative rotation between the syringe cylinder 3 and the plunger 4 causes the adapter to move. The protruding piece 5b of 5 and the first contact portion 6a of the finger hanging portion 6 are opposed to each other.
When the plunger 4 is pushed in this state, as shown in FIG. 8A, the first projecting piece 5b-1 comes into contact with the first contact portion 6a and is measured.
When the target amount is measured using the second projecting piece 5b-2, after roughly sucking so as to sufficiently exceed the target amount, the relative rotation between the syringe cylinder 3 and the plunger 4 causes the adapter to rotate. The protruding piece 5b of 5 and the second contact portion 6b of the finger hanging portion 6 are opposed to each other.
When the plunger 4 is pushed in such a state, as shown in FIG. 8B, the first protruding piece 5b-1 passes through the notch 6b-1, and the second protruding piece 5b-2 is moved to the second position. Quantitatively weighs in contact with the contact portion 6b. It is good also as a structure which eliminates the part of the notch part 6b-1 of the 2nd contact part 6b, and lets the 1st protrusion piece 5b-1 pass.

  In this way, two types of quantitative test water with different target amounts can be selectively held in the syringe cylinder 3, and test water with different dilution rates can be arbitrarily obtained. It is good also as a structure which obtains the dilution rate of three steps or more.

In each said embodiment, although the example in which the protrusion member was provided in the plunger 4 side was demonstrated, you may provide a protrusion member in the syringe cylinder 3 side. That is, the protruding member and the receiving member are relatively provided between the syringe cylinder 3 and the plunger 4.
FIG. 9 shows an example (fifth embodiment) in which the protruding member is provided on the syringe cylinder 3 side. In the syringe 1 according to the present embodiment, a semicircular finger hooking portion 16 serves as a protruding member, and the finger hooking portion 16 is integrally provided with a plurality of columnar protruding pieces 15a, 15b, 15c having different protruding amounts in the axial direction. .

Correspondingly, the plunger 4 is provided with a receiving member 17 with which the projecting portions 15a, 15b or 15c abut. The receiving member 17 also serves as a pressing plate for the plunger 4.
When performing measurement, after roughly sucking so as to sufficiently exceed the set target amount, the protruding pieces 15a, 15b, 15c are caused by relative rotation of the syringe cylinder 3 and the plunger 4 in the direction around the axis. 1 and the receiving member 17 of the plunger 4 are made to oppose each other.
When the plunger 4 is pushed in such a state, any one of the projecting pieces 15a, 15b, and 15c and the receiving member 17 are brought into contact with each other to be quantitatively measured. The axial height of each protruding piece 15a, 15b, 15c is set so that each target amount of water remains in the syringe cylinder 3.
One protrusion piece may be provided on the finger hook 16. Further, when the protruding member is provided on the syringe cylinder 3 side, the protruding piece may be formed by being attached to a finger-holding portion of a commercially available syringe, as in the first embodiment.

  In each of the above-described embodiments, the quantitative measurement and the dilution of the test water in the analysis field have been exemplified. However, the present invention is not limited to this and can be used for quantitative measurement of various liquids. For example, it can be used as a quantitative supply tool for adding a chemical solution to a solution.

The preferred embodiments of the present invention have been described above. However, the present invention is not limited to such specific embodiments, and unless specifically limited by the above description, the present invention described in the claims is not limited. Various modifications and changes are possible within the scope of the gist.
The effects described in the embodiments of the present invention are merely examples of the most preferable effects resulting from the present invention, and the effects of the present invention are limited to those described in the embodiments of the present invention. is not.

DESCRIPTION OF SYMBOLS 1 Liquid measuring tool 2 Intake port 3 Syringe cylinder as a liquid accommodation member 4 Plunger as a sliding member 5, 13 Protruding member 5b, 13b, 15a, 15b, 15c Protruding piece 5b-1 First protruding piece 5b-2 First 2 protruding pieces 6, 16 Finger-hanging portion 6 as receiving member 6 a First abutting portion 6 b Second abutting portion 8 Test water as liquid 10 Distilled water as diluting solution 17 Receiving member X Predetermined amount (target amount)

Claims (7)

A cylindrical liquid containing member having a suction port on the distal end side;
A sliding member provided to be slidable in the axial direction in the liquid containing member;
A protruding member provided on one of the liquid containing member and the sliding member and extending in the axial direction;
A receiving member provided on the other of the liquid containing member and the sliding member;
With
The projecting member and the receiving member are opposed to each other at a predetermined rotational position in a direction around the axis of at least one of the liquid storage member and the sliding member, and contact with each other by movement of the sliding member. A liquid metering device, wherein a predetermined amount of liquid storage space is formed on the tip side of the liquid storage member.   The projecting member includes a mounting portion mounted on one of the liquid storage member and the sliding member, and a projecting piece provided integrally with the mounting portion and projecting in the axial direction. The liquid measuring instrument according to claim 1.   The protruding piece has a stepped shape that is different in the axial direction at a position where the protruding piece comes into contact with the receiving member, and the receiving member has a first contacting portion with which a protruding portion of the protruding piece comes into contact, A portion having a large amount of protrusion is allowed to pass therethrough and a second abutting portion with which a portion having a small amount of protrusion abuts than a portion having a large amount of protrusion is contacted, and the predetermined amount can be arbitrarily changed. The liquid measuring instrument according to claim 2.   The projecting member has a plurality of projecting pieces with different projecting amounts in the axial direction, and the predetermined amount can be arbitrarily changed by making the projecting pieces facing the receiving member different. Item 3. The liquid measuring tool according to Item 2.   The said liquid storage member is a syringe cylinder, the said sliding member is a plunger, and the said receiving member or the said protrusion member is a finger-hook part provided in the said syringe cylinder, Any one of Claims 1-4 characterized by the above-mentioned. Liquid measuring instrument as described in one. A liquid metering method using a liquid metering instrument having a cylindrical liquid container having a suction port on the tip side, and a sliding member provided so as to be slidable in the axial direction inside the liquid container,
After the sliding member is moved to the rear end side of the liquid containing member and a liquid exceeding a predetermined amount is sucked into the liquid containing member, at least one of the liquid containing member and the sliding member is rotated around the axis. The protruding member and the receiving member that are provided relative to the liquid containing member and the sliding member and extend in the axial direction are opposed to each other, and then the sliding member is moved to move the protruding member And the receiving member are brought into contact with each other to discharge the excessively sucked liquid and leave the predetermined amount of liquid defined by the contact in the liquid storage member. A dilution method using a liquid measuring instrument having a cylindrical liquid storage member having a suction port on a distal end side, and a sliding member provided so as to be slidable in the axial direction inside the liquid storage member,
After the sliding member is moved to the rear end side of the liquid containing member and a liquid exceeding a predetermined amount is sucked into the liquid containing member, at least one of the liquid containing member and the sliding member is rotated around the axis. The protruding member and the receiving member that are provided relative to the liquid containing member and the sliding member and extend in the axial direction are opposed to each other, and then the sliding member is moved to move the protruding member And the receiving member are brought into contact with each other to discharge the excessively sucked liquid, leaving the predetermined amount of liquid defined by the contact in the liquid containing member, and leaving the predetermined amount of liquid. In this state, the sliding member is moved to the rear end side of the liquid storage member, the diluted liquid is sucked into the liquid storage member, and the predetermined amount of liquid remaining in the liquid storage member is increased by a predetermined magnification. The dilution method characterized by diluting to.

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