JP2014010084A - Variable measuring container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a variable measuring container capable of performing the fine adjustment of measurement while suppressing the variation of measurement, and accurately measuring desired amounts at the same time.SOLUTION: An insert 4 on whose inner peripheral surface a female screw section 4a is formed is disposed at the opening of a cylinder 1, and an inner sleeve 5 on whose outer peripheral surface a male screw section 5b is formed, and through the inside of which a rod 3 passes is coaxially attached to the insert 4, and an outer sleeve 6 configured to move integrally with the inner sleeve 5 in an axial direction is disposed at the outside of the insert 4 such that a screw type stopper mechanism for regulating the maximum stroke amounts Lmax of a piston 2 is constituted. Then, the piston 2 is displaced from the lowermost point to the maximum stroke amounts (=Lmax) reaching a position where it abuts to a tip 5a of the inner sleeve 5 by the rod 3 such that the content is measured (=S×Lmax).

Description

  The present invention relates to a variable measuring container, and more particularly to a variable measuring container capable of finely adjusting a measurement while suppressing variation in measurement and at the same time accurately measuring a desired amount.

Liquid measuring instruments with scales such as pipettes, cylinders, and syringes are known. In the measurement using these liquid measuring instruments, the user visually adjusts the position of the liquid level of the contents to a desired scale.
In addition to the liquid measuring instrument using the scale, the rod (plunger) is pressed and the elastic member provided on the tip side of the cylinder (outer cylinder) is compressed by the piston (gasket), and then the rod According to the suction tool for blood sedimentation measuring instrument, which releases the pressure, the plunger and the gasket are retracted by the restoring force of the elastic member, and the inside of the outer cylinder is evacuated to introduce a necessary amount of blood into the blood sedimentation measurement tube. A device is known (for example, refer to Patent Document 1).
Further, in addition to the liquid metering instrument using the restoring force of the elastic member, the present invention relates to a syringe barrel in which three hollow structure pistons having different diameters are arranged in order of concentricity with respect to one cylinder. A device is known (see, for example, Patent Document 2).
In this syringe barrel, this concentric multiple piston structure solves the volume error in the large volume syringe barrel, and collects a sample to be collected in a wide range of volumes with one syringe barrel, It is said that there is an excellent effect of expanding the range of use of the syringe barrel, such as being able to measure and thus improving workability.

Japanese Utility Model Publication No. 6-22959 Japanese Utility Model Publication No. 62-34281

In the case of a liquid measuring instrument using the scale, the liquid surface has a convex shape due to its surface tension, and it is difficult to adjust the position of the liquid level to the scale visually due to light refraction. is there. Therefore, there is a problem that variation occurs in measurement.
In the case of a liquid measuring instrument that utilizes the restoring force of the elastic member, the sliding resistance when the elastic member and the gasket slide against the inner wall surface of the outer cylinder, and the physical properties of the sampled liquid (specific gravity, density, viscosity) ) And the like, there is a problem in that there is a variation in measurement due to the variation in the stroke amount of the piston as in the liquid measuring instrument using the scale. In addition, there is also a problem that fine adjustment of the measurement is difficult due to variations in the stroke amount of the piston.
In addition, in the case of the syringe barrel having the concentric multiple piston structure, the user needs to operate three pistons having different diameters, and there is a problem that the weighing operation is complicated. Therefore, there is a problem that variation occurs in the measurement as in the liquid measuring instrument.
Therefore, the present invention has been made in view of the above-described problems of the prior art, and is capable of fine adjustment of measurement while suppressing variation in measurement, and at the same time, a variable capable of accurately measuring a desired amount. The purpose is to provide a weighing container.

Among the present inventions for solving the above technical problems, the means of the invention according to claim 1 is configured to drive / piston a piston along an axial direction inside a cylinder by a rod to suck / meter a desired amount of contents. A variable weighing container,
A stopper that is positioned along the axial direction inside the cylinder by a screw-type feed mechanism is provided inside the cylinder, and the piston is moved from a position where it abuts against the suction port of the cylinder to a position where it abuts against the stopper. The contents are measured by being displaced by the rod up to a maximum stroke amount (Lmax).

In the conventional cylinder-type weighing container, the contents are weighed by visually matching the position of the liquid level with a desired scale. The liquid level position of the contents becomes convex downward due to the surface tension, and furthermore, it is difficult to visually match the liquid level position to the scale due to light refraction. For this reason, variation occurs in the weighing of the contents.
However, in the above-described configuration, the object to be defined by the scale is the position of the stopper, and this position is defined by the maximum stroke amount of the piston, that is, the position where the piston contacts the suction port of the cylinder. This is equivalent to defining the maximum stroke amount (= Lmax) of the piston from the (lowest point) to the position where it abuts against the stopper. Accordingly, displacing the piston from the lowest point to the maximum stroke amount is equivalent to measuring the content of S × Lmax when the cross-sectional area (= S) of the cylinder is constant. . That is, in the above-described configuration of the first aspect, the maximum stroke amount (= Lmax) of the piston is accurately defined (positioned) by a screw-type feed mechanism described later, and therefore the piston is moved from the lowest point to the stopper by the rod. By displacing by the maximum stroke amount (= Lmax) that reaches the position where it abuts, the content of S × Lmax can be accurately measured, and variations in measurement are less likely to occur.

  Moreover, in the said structure of Claim 1, the said stopper is positioned by the screw type feed mechanism. In the case of the screw-type feeding mechanism, one screw is fed while the surface of each thread of the male screw and the surface of each valley of the female screw are in contact with no gap. Therefore, once the position of the stopper is positioned by the screw type feeding mechanism, the position of the stopper is stably held by the screw mechanism. That is, when the position of the stopper is stably held, the maximum stroke amount (= Lmax) of the piston is also stably held. As a result, the piston is moved from the lowest point to the maximum stroke amount (= In the case of displacement to Lmax), the content corresponding to the maximum stroke amount (= Lmax) can be accurately measured (= S × Lmax). Further, in the case of the screw type feed mechanism, the feed amount per rotation can be set finely by making the screw pitch dense, so that the position of the stopper, that is, the maximum stroke amount of the piston ( = Lmax) can be defined with high accuracy, and as a result, the contents can be accurately measured (= S × Lmax).

  According to a second aspect of the present invention, an insert having an inner peripheral surface formed with an internal thread is provided in the opening of the cylinder, and the insert has an inner sleeve in which an external thread is formed on the outer peripheral surface and the rod penetrates the inside. There is a screw connection.

  In the above-described configuration, the insert and the inner sleeve constitute a screw-type feeding mechanism, and the tip of the inner sleeve functions as a stopper for the piston. Since the inner sleeve has a structure through which a rod for driving the piston passes, the inner sleeve for defining the maximum stroke amount (= Lmax) of the piston and the rod for driving the piston do not interfere with each other. Thereby, the maximum stroke amount (Lmax) of the piston can be accurately defined, the piston can be displaced by the maximum stroke amount (= Lmax), and the contents can be accurately measured (= S × Lmax). It becomes like this.

  According to a third aspect of the present invention, a light-transmitting outer sleeve configured to move integrally with the axial direction of the inner sleeve is provided outside the insert.

  In the above-described configuration, the inner side of the outer sleeve can be seen from the outside, so that the insert and the inner sleeve located inside the outer sleeve can be seen from the outside. Therefore, by setting the scale on the outer peripheral surface of the outer sleeve and setting the indicator to the insert, the position of the tip of the inner sleeve, that is, the position of the piston stopper, that is, the maximum stroke amount (= Lmax) of the piston is externally set. Therefore, it can be defined accurately by visual inspection.

  According to a fourth aspect of the present invention, a scale is formed on the outer peripheral surface of the outer sleeve, and a circumferential protrusion that indicates the scale is formed on the outer peripheral surface of the insert.

  With the above-described configuration, the position of the piston stopper, that is, the maximum stroke amount (= Lmax) of the piston can be accurately defined from the outside by visual inspection.

  According to a fifth aspect of the present invention, the inner sleeve includes a flange portion.

  In the above-described configuration according to the fifth aspect, since the operator can easily rotate the inner sleeve, the position of the piston stopper, that is, the maximum stroke amount (= Lmax) of the piston can be easily and accurately defined. Become.

  According to the variable measuring container of the present invention, the screw type stopper mechanism that accurately defines the maximum stroke amount (= Lmax) of the piston is provided inside the cylinder, so that the position from the lowest point of the piston to the position contacting the stopper is reached. The maximum stroke amount (= Lmax) can be accurately defined. Thereafter, the content can be accurately measured (= S × Lmax) by displacing the piston from the lowest point to the maximum stroke amount (= Lmax). Also, by tightening the pitch of the female thread part of the insert and the male thread part of the inner sleeve constituting the screw type stopper mechanism, the screw feed amount per rotation becomes fine, and the maximum stroke amount of the piston (= Lmax) Can be defined with higher accuracy, and as a result, the accuracy of weighing (= S × Lmax) can be further increased.

It is principal part cross-sectional explanatory drawing which shows the variable measuring container of this invention. FIG. 2 is a detailed view of part A in FIG. 1. It is BB sectional drawing of FIG. It is explanatory drawing which shows an example of the measurement using the variable measurement container of this invention (when the maximum value of measurement = 7 ml). It is explanatory drawing which shows an example of the measurement using the variable measurement container of this invention (when the intermediate value of measurement = 5 ml). It is explanatory drawing which shows an example of the measurement using the variable measurement container of this invention (when the minimum value of measurement = 3 ml).

  Hereinafter, the present invention will be described in more detail with reference to embodiments shown in the drawings.

FIG. 1 is an explanatory cross-sectional view of a main part showing a variable measuring container 100 of the present invention.
The variable measuring container 100 includes a cylinder 1 for storing contents, a piston 2 for sucking / compressing the contents, a rod 3 for driving the piston 2 along the axial direction of the cylinder 1, and a suction port 1a of the cylinder 1. , An insert 4 attached to an opening provided on the opposite side, an inner sleeve 5 whose tip 5a functions as a stopper for the piston 2 while being screwed to the insert 4, and an axial direction of the inner sleeve 5 and the cylinder 1 And an outer sleeve 6 that descends along the outside of the insert 4.

Although details will be described later, the inner sleeve 5 is fed out in the axial direction of the cylinder 1 with the insert 4 fixed to the cylinder 1 by meshing the female thread 4a of the insert 4 and the male thread 5b of the inner sleeve 5. It is configured to be. That is, the insert 4 and the inner sleeve 5 form a screw type feeding mechanism (screw type stopper mechanism). Accordingly, once the tip 5a of the inner sleeve 5 is positioned by the screw stopper mechanism, the position of the tip 5a is stably held by the screw stopper mechanism. As a result, the maximum stroke amount (= Lmax) of the piston 2 is also stably held. As a result, the piston 2 is moved by the rod 3 from the position where the piston 2 contacts the suction port 1a of the cylinder 1 and the inner sleeve. 5, when the displacement is made up to the maximum stroke amount (= Lmax) reaching the position abutting on the tip 5a, the content corresponding to the maximum stroke amount (= Lmax) can be accurately measured (= S × Lmax). become. Further, in the case of the screw type stopper mechanism, the screw feed amount per rotation can be set finely by making the screw pitch dense, so that the position of the tip 5a as the stopper, that is, The maximum stroke amount (= Lmax) of the piston can be defined with high accuracy, and as a result, the contents can be accurately measured (= S × Lmax).
Hereinafter, each configuration will be described in more detail.

  As shown in FIG. 2, the cylinder 1 is formed with a pedestal portion 1 b that receives the insert 4 and a circumferential convex portion 1 c that fits with the circumferential concave portion 4 c of the insert 4. Thereby, the insert 4 is restrained from moving in the axial direction with respect to the cylinder 1.

  As shown in FIG. 3, the cylinder 1 is formed with a claw portion 1 d that fits into the notch portion 4 b of the insert 4. Thereby, the insert 4 is restrained from rotating around the axial direction with respect to the cylinder 1. The insert 4 is fixed with respect to the axial direction of the cylinder 1 and its rotation. In the present embodiment, the claw portion 1d and the cutout portion 4b fitted to the claw portion 1d are a pair, but the present invention is not limited to this, and a plurality of pairs may be present.

  Returning to FIG. 2, a female screw portion 4 a is formed on the inner peripheral surface of the insert 4, and a male screw portion 5 b is formed on the outer peripheral surface of the inner sleeve 5. Accordingly, when the inner sleeve 5 is rotated from the state in which the female screw portion 4a of the insert 4 and the male screw portion 5b of the inner sleeve 5 are screw-coupled, the inner sleeve 5 is lowered or raised with respect to the insert 4, and the tip 5a thereof is the piston 2 Functions as a stopper against

  Returning to FIG. 1, the inner sleeve 5 and the outer sleeve 6 have a hollow concentric structure with respect to the rod 3. The inner sleeve 5 and the outer sleeve 6 move integrally with each other in the axial direction and the circumferential direction of the cylinder 1 by fitting the circumferential rib 5c of the inner sleeve 5 and the circumferential groove 6a of the outer sleeve 6. It is configured as follows.

  On the outer peripheral surface of the outer sleeve 6, a scale indicating the amount of the sucked content is written. The indication of the scale is made by the circumferential protrusion 4d of the insert 4. Accordingly, the outer sleeve 6 is made of a light transmissive plastic resin. The position of the tip 5a of the inner sleeve 5 (maximum stroke amount Lmax from the lowest point of the piston 2 to the position in contact with the tip 5a) and the indicated position of the scale of the circumferential protrusion 4d of the insert 4 (measurement of contents) Corresponds one-to-one. Incidentally, in the case of FIG. 1, the circumferential protrusion 4d of the insert 4 indicates a measurement value of 7 (ml). Therefore, by displacing the piston 2 with the rod 3 from the lowest point until it abuts against the tip 5a of the inner sleeve 5, the content of 7 (ml) can be accurately measured.

  Returning to FIG. 2, the insert 4 and the outer sleeve 6 prevent the outer sleeve 6 from being separated from the cylinder 1 by the engagement of the circumferential hook 6 b of the outer sleeve 6 and the circumferential protrusion 4 d of the insert 4. At the same time, the upper limit position of the tip 5a of the inner sleeve 5, that is, the maximum value of the maximum stroke amount (= Lmax) of the piston 2, that is, the maximum value of measurement is defined. On the other hand, as shown in FIG. 1, when the annular plate portion 5d of the inner sleeve 5 contacts the insert 4, the lower limit position of the tip 5a of the inner sleeve 5, that is, the minimum stroke amount (= Lmax) of the piston 2 is minimized. Defines the value, ie the minimum value of the metric. Incidentally, in this embodiment, for convenience of explanation, the maximum value of measurement is set to 7 (ml), and the minimum value of measurement is set to 3 (ml).

  A flange portion 5e is formed at the upper end of the inner sleeve 5 in the axial direction, and the user can easily rotate the inner sleeve 5, thereby easily and accurately defining the maximum stroke amount (= Lmax) of the piston 2. You will be able to

  FIG. 4-6 is an explanatory diagram illustrating an example of weighing using the variable weighing container 100. 4 shows the case of the maximum value of measurement, FIG. 5 shows the case of the intermediate value of measurement, and FIG. 6 shows the case of the minimum value of measurement.

As shown in FIG. 4 (a), first, the piston 2 is brought into a state positioned at the lowest point of the cylinder 1. Next, hold the cylinder 1 and rotate the outer sleeve 6 or the flange portion 5e until the circumferential protrusion 4d of the insert 4 indicates 7 (ml) of the scale of the outer sleeve 6 (in this embodiment, the circumferential shape The inner sleeve 5 is moved relative to the cylinder 1 until the projection 4d and the circumferential hook 6b are engaged.
Next, as shown in FIG. 4B, the rod 3 is pulled upward to fill the cylinder 1 with the contents 7.
Next, as shown in FIG. 4C, when the piston 2 comes into contact with the tip 5a of the inner sleeve 5, the lifting of the rod 3 is stopped.
By the above operation, 7 ml of the contents 7 can be accurately measured.

As shown in FIG. 5 (a), first, the piston 2 is brought into a state where it is located at the lowest point of the cylinder 1. Next, hold the cylinder 1 and rotate the outer sleeve 6 or the flange portion 5e to rotate the inner sleeve 5 into the cylinder 1 until the circumferential protrusion 4d of the insert 4 indicates the scale 5 (ml) of the outer sleeve 6. Move against.
Next, as shown in FIG. 5 (b), the rod 3 is pulled upward to fill the cylinder 1 with the contents 7.
Next, as shown in FIG. 5 (c), when the piston 2 comes into contact with the tip 5a of the inner sleeve 5, the lifting of the rod 3 is stopped.
By the above operation, 5 ml of the contents 7 can be accurately measured.

As shown in FIG. 6 (a), first, the piston 2 is brought into a state where it is positioned at the lowest point of the cylinder 1. Next, hold the cylinder 1 and rotate the outer sleeve 6 or the flange portion 5e until the circumferential projection 4d of the insert 4 indicates 3 (ml) of the scale of the outer sleeve 6 (in this embodiment, the insert 4 Until the annular plate portion 5d of the inner sleeve 5 comes into contact with the cylinder 1).
Next, as shown in FIG. 6B, the rod 3 is pulled upward to fill the cylinder 1 with the contents 7.
Next, as shown in FIG. 6 (c), when the piston 2 comes into contact with the tip 5a of the inner sleeve 5, the lifting of the rod 3 is stopped.
By the above operation, 3 ml of the contents 7 can be accurately measured.

  As described above, according to the variable measuring container 100 of the present invention, according to the variable measuring container of the present invention, the screw type stopper mechanism that accurately defines the maximum stroke amount (= Lmax) of the piston 2 is provided inside the cylinder. Therefore, the maximum stroke amount (= Lmax) from the lowest point of the piston 2 to the position in contact with the tip 5a of the inner sleeve 5 can be accurately defined. Thereafter, the piston 3 is displaced from the lowest point to the maximum stroke amount (= Lmax) by the rod 3, so that the contents can be accurately measured (= S × Lmax). Further, by making the pitches of the female screw portion 4a of the insert 4 and the male screw portion 5b of the inner sleeve 5 constituting the screw type stopper mechanism, the screw feed amount per rotation becomes fine, and the maximum stroke of the piston 2 is increased. The amount (= Lmax) can be defined with higher accuracy, and as a result, the accuracy of weighing (= S × Lmax) can be further increased.

  The variable measuring container of the present invention is suitably applied to the precise measurement of liquid contents.

DESCRIPTION OF SYMBOLS 1 Cylinder 2 Piston 3 Rod 4 Insert 4a Female thread part 4b Notch part 4c Circumferential recessed part 4d Circumferential protrusion 5 Inner sleeve 5a Tip (stopper)
5b Male thread part 5c Circumferential rib 5d Annular plate part 5e Flange part 6 Outer sleeve 6a Circumferential groove 6b Circumferential hook 7 Contents 100 Variable measuring container

Claims (5)

A variable metering container for driving a piston (2) along the axial direction inside a cylinder (1) by means of a rod (3) to aspirate / meter a desired amount of contents;
A stopper (5a) positioned along the axial direction inside the cylinder (1) by a screw-type feed mechanism is provided inside the cylinder (1), and the piston (2) is connected to the cylinder (1). The content is measured by displacing with the rod (3) from the position contacting the suction port (1a) to the maximum stroke amount (Lmax) from the position contacting the stopper (5a) to the position contacting the stopper (5a). A variable weighing container characterized by   The opening of the cylinder (1) is provided with an insert (4) having an internal thread (4a) formed on the inner peripheral surface thereof, and the insert (4) is formed with an external thread (5b) on the outer peripheral surface and the rod (3 2. The variable measuring container according to claim 1, wherein the inner sleeve (5) is threadedly connected to the inner sleeve (5).   The variable according to claim 2, wherein a light-transmitting outer sleeve (6) configured to move integrally with respect to the axial direction of the inner sleeve (5) is provided outside the insert (4). Weighing container.   The variable according to claim 2 or 3, wherein a scale is formed on the outer peripheral surface of the outer sleeve (6), and a circumferential protrusion (4d) for indicating the scale is formed on the outer peripheral surface of the insert (4). Weighing container.   The variable measuring container according to claim 2, 3 or 4, wherein the inner sleeve (5) includes a flange portion (5e).

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