JP2001004500A - Sample suction discharge device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suck or discharge a sample with one hand by arranging a button for suction and that for discharge at one and the other rack that are connected to a syringe piston, that are engaged to a toothed wheel that is rotated at right angle to the advance/retreat directions of the piston, and advance and retreat in opposite directions each other. SOLUTION: A base body 8 allows semi-elliptical cylindrical halves 8a and 8b to oppose each other and is integrated by screws 8C. At the lower portion of the inside of the base body 8, a syringe 5 is accommodated and is fixed to a position while the mouth of a cylinder 5a faces upward. On the inner-peripheral surface of the half 8a, a toothed wheel 1 is fitted on a shaft that projects orthogonally from the axis center of the cylinder 5a rotatably. At n upper portion in the substrate 8, a fist rack 3 that is engaged with the toothed wheel 1 and advances and retreats and sown is arranged and a second rack 4 is arranged on the opposite side while sandwiching an axis center 2. A retention part 6 that is directly coupled to a piston 5b is connected to the lower end of the first rack 3, and a button 3a for discharging is connected to an upper end part. A button 4a for suctioning is connected to the upper end part of the second rack 4. With this configuration, a sample can be discharged and sucked with one hand.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sample suction / discharge apparatus used for supplying a sample to a detection cell such as a prism type refractometer or a vibrating density meter and discharging the sample from the detection cell after the measurement. In particular, high-viscosity sample can be sucked, sample suction speed and discharge speed can be adjusted easily and arbitrarily, and there is no need to press the piston with a finger when suction or discharge is interrupted, and one-hand operation The present invention relates to a sample suction / discharge device excellent in operability that a suction operation and a discharge operation can be easily performed by using the same.

[0002]

2. Description of the Related Art For example, in a vibratory density meter, a detecting cell called a vibrating cell is provided which is formed of a U-shaped thin tube, and the density of the liquid is determined from the frequency of the vibrating cell when a sample is filled in the vibrating cell. It is calculated. The sample is introduced by sucking or press-fitting it into the vibrating cell.If the liquid volume of the sample is sufficiently large, this introduction is continued until a certain time has elapsed since the start, and stopped when a certain time has elapsed after the start. I am trying to do it. When the liquid volume of the sample is small, the sample sampled with the spoiler or syringe is sucked or pressed into the vibrating cell and supplied, and after measurement, the sample is pressurized or sucked from the vibrating cell with the same spoid or syringe and discharged. Like that.

As shown in the block diagram of FIG. 12, a sample suction / discharge device used for supply and discharge of a sample to / from the vibration cell includes a cylinder 5a having a suction / discharge port at one end and a cylinder 5a provided inside the cylinder 5a. Piston 5 inserted so that it can advance and retreat
b, and a syringe 5 having a spring 5c for urging the piston 5b toward the other end of the cylinder 5a.
In some cases, the suction / discharge port 5d of the cylinder 5a is connected to a vibration cell of a vibratory density meter, that is, a detection cell.

When a sample is sampled using the syringe 5, the piston 5b is pushed with a finger against the spring 5c into the back of the cylinder 5a, that is, at the bottom dead center, and is connected to the suction / discharge port 5d. While the sample inlet is kept immersed in the sample, the force of the finger pressing the piston 5b is gradually relaxed, and the piston 5b is pushed up by the force of the spring 5c to suck the sample into the cylinder 5a.

Further, as shown in the configuration diagram of FIG. 13, the sample suction / discharge device is also used for suctioning and discharging a sample to an optical cell of a prism type refractometer.

[0006]

By the way, in this syringe 5, since the suction force for sucking the sample into the cylinder 5a depends on the elastic restoring force of the spring 5c, a sample having high viscosity may not be sucked in some cases. . A powerful spring 5c may be used to aspirate a high-viscosity sample. However, if a powerful spring 5c is used, the aspiration speed becomes too high when a low-viscosity sample such as an organic solvent is aspirated. There is a possibility that a part of the sample may be vaporized due to the occurrence of a decompressed state, and the measurement may be performed in a state where the sample contains air bubbles. That is, in this syringe 5, the sample is transferred to the cylinder 5a.
Since the suction force sucked into the inside depends on the elastic restoring force of the spring 5c, the suction speed of the sample or the time required to suck a predetermined amount of the sample cannot be adjusted according to the properties of the sample. Further, in the syringe 5, when the suction of the sample is completed and the suction is interrupted in order to prevent the subsequent suction of the outside air, it is necessary to stop the movement by pressing the piston 5c with a finger. Disadvantageous.

[0007] A similar problem occurs when a spoiler is used. When a syringe without the spring 5c is used, it is necessary to pull up the piston 5b by hand in order to raise the piston 5b, which makes one-handed operation difficult. Operability is further deteriorated.

[0008] The present invention solves the technical problems associated with these prior arts, can suction a sample with high viscosity, and can easily adjust the suction speed and discharge speed of the sample.
It is another object of the present invention to provide a sample suction / discharge device excellent in operability, in which it is not necessary to press a piston with a finger when suction or discharge is interrupted, and a suction operation and a discharge operation can be easily performed by one-handed operation.

[0009]

SUMMARY OF THE INVENTION To this end, the present invention provides a syringe having a cylinder and a piston removably inserted into the cylinder.
One base for supporting the cylinder of the syringe, one or two sets of gears rotatably supported on the base so as to be rotatable about an axis perpendicular to the reciprocating direction of the piston, and one end of the piston And a first rack that moves forward and backward while meshing with the one or two sets of gears, and a direction opposite to the forward and backward direction of the first rack while meshing with the one or two sets of gears. And a second rack supported by the base so as to advance and retreat in the crossing direction.

As the syringe, a well-known syringe having a cylinder made of glass or synthetic resin and one piston inserted into the cylinder so as to be able to move forward and backward may be used. It is also possible to form integrally.

[0011] In addition to the cylinder of the syringe,
Supporting a pair of gears or a pair of gears and a second rack;
A piston and a first rack are supported via the cylinder. However, the first rack may be directly supported by the base in order to stabilize the operation of the first rack.

The shape of the base is as follows:
It is only necessary to form the gears and the second rack into a shape that can support the gears and the second rack. However, it is preferable to consider operability and design, and for example, a cylindrical shape, an elliptical cylindrical shape, or the like is adopted. Is preferred. The material of the substrate is not particularly limited, and for example, a synthetic resin, a metal, or the like may be used.

The one gear or a pair of gears is supported on a base at a predetermined position with respect to a cylinder of the syringe so as to be rotatable about an axis perpendicular to the direction of movement of the piston. The first and second racks mesh with this gear.

In the present invention, a set of one or two gears is supported by the base. One gear includes a hub and a number of teeth arranged in a row around the hub. And a double gear having a plurality of teeth arranged in two rows in one hub. In the former case, the first and second racks mesh with the teeth arranged in the single row, and In the latter case, the first and second racks are engaged with different rows of teeth.

The type of the gear is not particularly limited as long as it can engage with the racks (blade rows) formed on the first and second racks or the beveled blade rack. A parallel spur gear, a helical gear which is a cylindrical gear having a spiral helical winding, a bevel gear combining a right and left torsion helical gear, and the like can be used. However, in the present invention, it is advantageous that the two racks mesh with one common gear since the structure can be simplified most easily. In this structure, it is costly to use a spur gear as the gear. This is the most advantageous in downing.

In the present invention, when a pair of gears is used, the two gears are connected so as to rotate synchronously in the same direction, and the first and second racks are different gears. Engage with.

The first rack is connected at one end to a piston of the syringe, and is arranged so that an axial direction thereof is parallel to a moving direction of the piston so as to move while meshing with the one or two gears. And is provided so as to be movable in the axial direction.

Although there is no particular need to provide means for guiding the movement of the first rack, the operation of the first rack is stabilized, and the first rack is connected to the one or two sets of gears. It is preferable that the base is provided with guide means for guiding the movement of the first rack in order to reliably engage the first rack.

The second rack is provided with one or two sheets.
The first rack is supported by the base so as to move in a direction opposite to or intersecting with the moving direction of the first rack while meshing with the set of gears.

In the case where the second rack is supported by the base so as to advance and retreat in a direction opposite to the advance and retreat direction of the first rack while engaging with the one or a pair of gears, When a discharge operation button is connected to the other end of the first rack to which the piston is connected, by pushing the discharge operation button, the piston is pushed into the back of the cylinder via the first rack, The sample in the syringe will be pushed out by the piston.

In this case, if a suction operation button is continuously provided at the end of the second rack in the same direction as the direction in which the discharge operation button is provided, the suction operation button is pushed in. The second rack, the gear, and the second
The piston is pulled out to the mouth of the cylinder via the first rack, which runs counter to the rack, and the sample is sucked into the syringe.

In the case where the second rack is supported by the base so as to advance and retreat in a direction intersecting the advance and retreat direction of the first rack while meshing with the one or a pair of gears, When a discharge operation button is continuously provided at one end of the second rack and a suction operation button is continuously provided at the other end, the second rack, one sheet or a set of two sheets is pressed by pushing the discharge operation button. The piston is pushed into the back of the cylinder via the gear and the first rack, and the piston is pulled out to the mouth of the cylinder via the second rack, the gear and the first rack by pushing the suction operation button. It can be configured as follows.

In this case, a single gear composed of a double gear having teeth arranged in two rows having different pitch circle radii is used,
When the first rack is engaged with the small-diameter tooth row and the second rack is engaged with the large-diameter tooth row, the operating force of the first rack relative to the operating force of the second rack, that is, The operation force of the piston can be increased, and the effect of facilitating the suction of a sample having a higher viscosity can be obtained. In addition, the operation amount of the first rack with respect to the operation amount of the second rack decreases,
The effect that the fine adjustment of the sample suction speed can be easily performed is obtained.

The same effect can be obtained by using a pair of gears having different pitch circle radii, meshing the first rack with a small-diameter gear, and meshing the second rack with a large-diameter gear. Can be.

In the case where the second rack is supported by the base so as to advance and retreat in a direction intersecting with the advance and retreat direction of the first rack while meshing with the one or a pair of gears, It is also possible to discharge the sample from the syringe by pushing in the rack.

That is, the second rack is the one or two
The first rack is supported by the base so as to advance and retreat in a direction intersecting with the advance and retreat direction of the first rack while meshing with a set of gears. A button is continuously provided, a suction operation button is continuously provided at one end of the second rack, and the piston is pushed into the cylinder through the first rack by pressing the discharge operation button. By pressing the suction operation button, the piston can be drawn out to the mouth of the cylinder via the second rack, the gear and the first rack.

As described above, according to the present invention, the operation of pulling out the piston from the back of the cylinder to the mouth is an operation of pressing the second rack with a finger, and the pressing force of the finger is increased to increase the viscosity. Even a high sample can be sucked into the cylinder. In addition, by adjusting the speed at which the second rack is pressed with this finger, the suction speed or the time required for suctioning a predetermined amount of sample can be easily adjusted.
Furthermore, since there is no spring or an elastic film for enlarging the volume of the spoiler for urging the piston or the rack, the first and second racks, one sheet or two sheets even if the hand is released from the rack when the suction or discharge is interrupted. Since the gears and the piston of the set are not driven and there is no danger of sucking the sample back into the cylinder or sucking outside air, there is no need to hold down the piston when the suction or discharge is interrupted.

Moreover, since both the pushing operation and the pulling-back operation of the piston can be performed by the pushing operation of the first rack or the second rack, the cylinder of the syringe is supported by, for example, the palm and the little finger, the ring finger and the middle finger of one hand, and the one hand is used. The suction operation and the discharge operation can be easily performed by one-handed operation such that the thumb and the forefinger share the push-in operation and the pull-back operation of the piston.

[0029] The piston of the syringe is provided with the first piston.
It is only necessary that the piston and the first rack be interlocked with one end of the rack. For example, a transmission mechanism such as a rod and a lever, which can transmit the operation in both reciprocating directions, is interposed between the piston and the first rack. However, in order to increase the reliability of the operation, for example, a holding portion for connecting the piston to one end of the first rack is provided, and the piston is directly connected to the holding portion so that the first rack and the piston are connected. Is preferably directly connected.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A sample suction / discharge apparatus according to one embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is an exploded perspective view of a sample suction / discharge apparatus according to one embodiment of the present invention. FIGS. 2 and 3 are schematic diagrams showing the structure of the sample suction / discharge apparatus. The suction / discharge device includes a syringe 5 having one cylinder 5a and one piston 5b inserted into and retractable from the cylinder 5a, and one base 8 supporting the cylinder 5a of the syringe 5.

The base 8 is made of, for example, a synthetic resin.
The two halves 8a and 8b of a semi-elliptic cylindrical shape whose both ends are closed are opposed to each other, and two screws 8c inserted into one half a are screwed into the other half 8b and integrated by screwing. Have been.

A positioning projection 8d is formed at one of the corresponding positions of the joining surfaces of the halves 8a and 8b, and a positioning recess 8e is formed at the other. Then, the corresponding projection 8d and recess 8e correspond to each other.
And the two halves 8a, 8b
Are aligned with each other.

However, which half 8a, 8b is provided with the projection 8d is free. As shown in FIGS. 1 to 3, one half 8a is provided with the projection 8d and the concave portion 8e, and the other half 8b is provided with the projection 8d. May be provided with a corresponding recess 8e and projection 8d.

The syringe 5 is housed in the lower part inside the base 8 with the cylinder 5a being arranged on the vertical axis with the mouth of the cylinder 5a facing upward, and the cylinder 5a is inserted into the semicircular groove 8f formed inside the base 8. And a rib 8g having the outer peripheral surface of the cylinder 5a formed inside the base 8 and the base 8
The cylinder 5a is fixed at a predetermined position in the base body 8 by receiving the lower end wall 8h of the cylinder 5a.

A shaft 2 orthogonal to the axis of the cylinder 5a protrudes from the inner peripheral surface of one half 8a.
One hub 1c and a number of teeth 1a arranged in a row around the hub 1c
A single gear 1 made of a spur gear provided with the above is rotatably fitted to the outside. The tip of the shaft 2 protruding from the end surface of the gear 1 projects into a concave portion (not shown) provided in the other half 8b, thereby preventing the shaft 2 from swinging or bending.

Further, a first rack 3 which meshes with the gear 1 and moves up and down in the vertical direction is provided on an upper portion in the base body 8.
On the opposite side of the first rack 3 with respect to the shaft 2, there is disposed a second rack 4 which meshes with the gear 1 and moves up and down in the vertical direction, and upper ends of the first and second racks 3 and 4. Each part penetrates through the upper end wall 8i of the base body 8 and projects upward.

At the lower end of the first rack 3, a holding portion 6 projecting at a right angle to the reciprocating direction is continuously provided, and the biston 5b is directly connected to the holding portion 6. The upper end of the first rack protrudes above the base 8, and a discharge operation button 3a is continuously provided at the upper end.

Thus, when the discharge operation button 3a is pushed downward while holding the base 8, the piston 5b is pushed deep into the cylinder 5a, and the sample passes through the suction / discharge port 5d connected to the lower end of the cylinder 5a. It is discharged to the outside of the cylinder 5a.

Since the first rack 3 is directly connected to the piston 5b of the syringe 5, there is no need to provide any means for guiding the first rack 3 up and down.
In order to stably engage the rack 3 with the gear 1, a guide portion 8j for guiding the elevation of the first rack 3 is provided.

The upper end of the second rack 4 protrudes above the base 8, and a suction operation button 4a is connected to the upper end thereof. The second rack 4 is also guided up and down by the guide portion 8k so as to reliably mesh with the gear 1.

As shown in FIG. 2, the sample suction / discharge device in a state where the piston 5b is located at the bottom dead center is gripped by four fingers excluding the palm and the thumb of one hand and formed at the lower end of the cylinder 5 of the syringe 5. After the sample inlet of the detection cell connected to the suction / discharge port 5d is immersed in the sample and the thumb operation button 4a is pressed down with the thumb, the first rack 3 and the piston 5b are pulled up via the gear 1, and the sample is Cylinder 5 via detection cell
It is sucked into a.

When the viscosity of the sample is high, the sample is pressed down strongly by pressing down the suction operation button 4a.
Can be sucked into. Also, by adjusting the speed at which the suction operation button 4a is pressed down, the speed at which the sample is sucked into the cylinder 5a can be adjusted.

When the suction of the sample is interrupted on the way,
Release the thumb from the suction operation button 4a. When the thumb is released from the suction operation button 4a, the pushing of the second rack 4 is stopped, and the difference between the weights of the first and second racks 3, 4; the weight of the piston 5b; The differential pressure acting up and down acts as a force for lowering the piston 5b, but in fact, due to the sliding resistance of the piston 5b, the weight difference between the first and second racks 3 and 4,
The piston 5b does not start moving if the weight of the piston 5b and the differential pressure acting on the piston 5b act on the piston 5b.

However, the difference between the weights of the first and second racks 3, 4 acts in the direction of raising the piston 5b against the weight of the piston 5b and the differential pressure acting on the piston 5b. The weight of both racks 3 and 4 is designed so that the difference between the own weights of the second racks 3 and 4 is balanced with the own weight of the piston 5b acting in the direction of pulling down the piston 5b and the differential pressure acting on the upper and lower sides of the piston 5b. By doing so, it is possible to reliably prevent the piston 5b from moving.

As shown in FIG. 3, when the piston 5b is pulled up to, for example, the top dead center, a predetermined amount of the sample is filled in the cylinder 5a, and the thumb is released from the suction operation button 4a, whereby the detection cell and The suction of the sample into the syringe 5 is completed. Here, when the thumb is released from the suction operation button 4a as described above, the piston 5b is stopped, and the sucked sample is discharged from the syringe 5 and the detection cell,
The outside air is surely prevented from being sucked into the detection cell after the sample is sucked.

After stopping the suction of the sample for some reason,
To continue the suction of the sample, use the suction operation button 4a.
The ejection operation button 3a may be pushed in to discharge the sample.

After the suction of the sample is completed and a predetermined measurement is performed, or after the suction of the sample is interrupted for some reason before the predetermined measurement, the piston 5b is pressed and depressed when the discharge operation button 3a is depressed. It is pushed down to the exit 5d side,
The sample in the syringe 5 is discharged through the detection cell. When the piston 5b is pushed down to the bottom dead center, the entire amount of the sample is discharged from the syringe 5 and returns to the state shown in FIG.

That is, according to the sample suction / discharge device of this embodiment, the syringe 5 is gripped by one hand, and the suction operation button 4a is pressed down by one finger of the hand to suck the sample into the syringe 5. The suction operation and the discharge operation can be performed by one-handed operation such that the sample can be discharged from the syringe 5 by depressing the discharge operation button 3a with one finger of the hand, so that the operability is extremely high. .

In addition, if the operating force is adjusted in accordance with the viscosity of the sample, a high-viscosity sample can be easily sucked, and the suction speed can be adjusted by adjusting the operation speed of the suction operation button 4a. The discharge speed can be adjusted by adjusting the operation speed of the discharge operation button 3a. As a result, the amount of sample supplied to the detection cell can be accurately controlled, and the measurement accuracy can be improved.

FIG. 4 is a perspective view of a sample suction / discharge device according to another embodiment of the present invention, and FIGS. 5 and 6 are configuration diagrams schematically showing the structure of this sample suction / discharge device. The suction / discharge device includes a point that the second rack 7 is supported by the base 8 so as to advance and retreat in a direction intersecting the direction of advance and retreat of the first rack 3. The difference from the previous example is that the button 7b is provided with a suction operation button 7a at the other end thereof.

That is, the second rack 7 can be slid in a direction perpendicular to the axis 2 in a plan view.
The gear 1 is provided so as to penetrate the base 8 and is supported by the shaft 2 so as to be rotatable while meshing with the first rack 3 and the second rack, and a discharge operation button 7b is provided at one end thereof. The suction operation button 7a is connected to the other end.

As shown in FIG. 5, the sample suction / discharge device in a state where the piston 5b is located at the bottom dead center is gripped with three fingers excluding the palm and the thumb and the forefinger of one hand.
After immersing the sample inlet of the detection cell connected to the suction and discharge port 5d formed at the lower end of the sample into the sample, and pressing the suction operation button 7b rightward with the thumb, one of the racks 3 and the piston 5b is pulled up, and the sample is sucked into the cylinder 5a. When the viscosity of the sample is high, the sample can be sucked into the cylinder 5a by strongly pressing the suction operation button 7b. Also, by adjusting the speed at which the suction operation button 7b is pressed, the speed at which the sample is sucked into the cylinder 5a can be adjusted.

When the suction of the sample is interrupted on the way,
Release the thumb from the suction operation button 7b. When the thumb is released from the suction operation button 7b, the rack 7 stops, and the piston 5b receives the weight of one of the racks 3, the weight of the piston 5b, and the differential pressure acting on the top and bottom of the piston 5b.
Will act as a force to lower the back. However, in actuality, the piston 5b does not start to move to such an extent that the self-weight of the one rack 3 and the self-weight of the piston 5b and the differential pressure acting on the top and bottom of the piston 5b act on the piston 5b due to the sliding resistance of the piston 5b.

However, the weight and the weight of the other rack 7 are such that the static friction and inertia of the horizontally moving rack 7 can counter the own weight of one rack 3, the own weight of the piston 5b, and the differential pressure acting on the piston 5b. If the mass is designed, the movement of the piston 5b can be reliably prevented.

As shown in FIG. 6, when the piston 5b is pulled up to the top dead center, a predetermined amount of the sample is filled in the cylinder 5a, and the thumb is released from the suction operation button 7b, so that the injection to the syringe 5 is started. The suction of the sample is terminated.

Thereafter, when the ejection operation button 7a is pressed to the left with the index finger, the sample in the cylinder 5a is ejected from the sample inlet of the detection cell. When the viscosity of the sample is high, the sample is pushed into the cylinder 5 by strongly pressing the ejection operation button 7a.
a. Also, by adjusting the speed at which the ejection operation button 7a is pressed, the ejection speed of the sample from the cylinder 5a can be adjusted.

When the supply of the sample is interrupted for some reason, the index finger is released from the ejection operation button 7a. When the index finger is released from the discharge operation button 7a, the pushing of the rack 3 is stopped, and the piston 5b is moved to one of the racks 3a.
, The own weight of the piston 5b, and the differential pressure acting above and below the piston 5b act as a force to lower the piston 5b to the back. However, the actual weight of one of the racks 3 due to the sliding resistance of the piston 5b,
The piston 5b does not move to the extent that the differential weight acting on the piston 5b acts on the piston 5b due to its own weight and the vertical pressure acting on the piston 5b. Therefore, no extra sample is supplied from the syringe 5 to the detection cell, and no sample required for measurement is sucked back from the detection cell to the syringe 5.

When the supply of the sample is continued, the pushing operation of the ejection operation button 7a may be restarted. When the piston 5b is pushed down to the bottom dead center, the entire amount of the sample is discharged from the syringe 5, and FIG. It returns to the state shown in FIG.

After the measurement of the sample is completed, when the discharge operation button 7a is pressed down with the thumb, the sample is discharged from the syringe 5.

That is, according to the sample suction / discharge device of this embodiment, the syringe 5 is held in one hand, and the suction operation button 7b is pushed laterally with one finger of the hand, whereby the syringe 5 is inserted into the syringe 5. The suction operation and the discharge operation can be performed by one-hand operation such that the sample can be sucked, and the sample can be discharged from the syringe 5 by pressing the discharge operation button 7a in the opposite lateral direction with the other one finger of the hand. Therefore, the operability is extremely high.

Further, if the operating force is adjusted in accordance with the viscosity of the sample, a high-viscosity sample can be easily sucked, and the suction speed can be adjusted by adjusting the operation speed of the suction operation button 7b. The discharge speed can be adjusted by adjusting the operation speed of the discharge operation button 7a. As a result, the amount of the sample supplied to the detection cell can be accurately controlled, and the measurement accuracy can be improved.

Another embodiment of the present invention shown in each of the configuration diagrams of FIGS. 7 and 8 is a dual gear having a hub 1c as the gear 1 and teeth 1a and 1b arranged in two rows of large and small diameters around the hub 1c. Gears are used. The second rack 7 is provided with a large-diameter blade row 1a,
Rack 3 is engaged with each of the small-diameter blade rows 1b, the first rack 3 and the piston 5b are operated at half the operating speed of the second rack 7, and the second rack 7 is operated. The first rack 3 and the piston 5 with twice as much force
b will be operated. Therefore, an effect is obtained that it is easy to finely adjust the sample suction amount with a small operation force.

The same effect can be obtained by using a pair of large and small gears connected to each other instead of the double gear.

Other configurations, operations and effects of this embodiment are the same as those of the previous example shown in FIGS. 4 to 6, and therefore, description thereof will be omitted to avoid duplication.

As shown in the perspective view of FIG. 9 and the configuration diagrams of FIGS. 10 and 11, in the sample suction / discharge apparatus according to still another embodiment of the present invention, a discharge operation is performed on the upper end of the first rack 3. Button 3a, and a suction operation button 7b is continuously provided at one end of the second rack 7 which advances and retreats in a direction intersecting at right angles to the advance and retreat direction.

When the suction operation button 7b is pushed in, the first rack 3 and the piston 5b are raised via the gear 1, the sample is sucked into the syringe 5, and when the discharge operation button 3a is pushed in, the first rack 3 is pushed. 3 and the piston 5b descend, and the sample is discharged from the syringe 5.

Other configurations, operations and effects of this embodiment are the same as those of the embodiment shown in FIGS. 4 to 6, and therefore, description thereof will be omitted to avoid duplication.

[0069]

As described above, the sample aspirating and discharging apparatus of the present invention comprises a syringe having one cylinder and one piston inserted into and retractable from the cylinder.
One base supporting the cylinder of the syringe, one or two sets of gears rotatably supported on the base so as to be rotatable about an axis perpendicular to the direction of movement of the piston, A first rack connected to a piston and moving forward and backward while meshing with the one or two sets of gears;
A second rack supported by the base so as to advance and retreat in a direction opposite to or intersecting with the advance and retreat direction of the first rack while meshing with a pair of gears or two gears.
By grasping the base of the sample suction / discharge device of the present invention with one hand and pushing the other rack interlocked with this rack via one of the racks or gears connected to the piston with the finger of one hand, the syringe is inserted into the syringe. The sample can be sucked and the sample can be discharged from the syringe. That is, according to the present invention, a sample suction / discharge device with extremely high operability can be obtained because a sample can be sucked into and discharged from the sample suction / discharge device by one-handed operation.

According to the present invention, the syringe of the sample suction / discharge apparatus of the present invention is gripped with one hand, and the other rack interlocked with this rack via one of the racks or gears connected to the piston is used with the other hand. By pushing with a finger, the sample can be sucked into the syringe and the sample can be ejected from the syringe, so that by adjusting the pushing force, even a sample with high viscosity can be sucked. By adjusting the operation speed of the pushing operation, the suction speed of the sample into the sample suction / discharge device is adjusted, and the amount of sample suction is accurately controlled, and the discharge speed of the sample from the sample suction / discharge device is adjusted. Thus, it is possible to easily control the supply amount of the sample from the sample suction / discharge device to the detection cell easily.

Further, since there is no need to press the piston or rack with a finger when the suction or discharge is interrupted, the operability can be further improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of the present invention.

FIG. 2 is a configuration diagram of the present invention.

FIG. 3 is a configuration diagram of the present invention.

FIG. 4 is an exploded perspective view of the present invention.

FIG. 5 is a configuration diagram of the present invention.

FIG. 6 is a configuration diagram of the present invention.

FIG. 7 is a configuration diagram of the present invention.

FIG. 8 is a configuration diagram of the present invention.

FIG. 9 is an exploded perspective view of the present invention.

FIG. 10 is a configuration diagram of the present invention.

FIG. 11 is a configuration diagram of the present invention.

FIG. 12 is a configuration diagram of a conventional example.

FIG. 13 is a configuration diagram of a conventional example.

[Explanation of symbols]

 Reference Signs List 1 gear 1a tooth 1b tooth 1c hub 2 shaft 3 first rack 3a discharge operation button 4 second rack 4a suction operation button 5 syringe 5b piston 7 second rack 7a discharge operation button 7b suction operation button 8 Substrate

Claims (9)

[Claims] 1. A syringe comprising a cylinder and a piston removably inserted into the cylinder;
One base for supporting the cylinder of the syringe, one or two sets of gears rotatably supported on the base so as to be rotatable about an axis perpendicular to the reciprocating direction of the piston, and one end of the piston And a first rack that moves forward and backward while meshing with the one or two sets of gears, and a direction opposite to the forward and backward direction of the first rack while meshing with the one or two sets of gears. A second rack supported by the base so as to advance and retreat in a crossing direction. 2. The gear according to claim 1, wherein the gear includes a hub and a plurality of teeth arranged in a row around the hub, and the first and second racks mesh with the teeth arranged in the row. A sample suction / discharge device according to item 1. 3. The gear according to claim 1, wherein said one gear comprises a double gear having a plurality of teeth arranged in two rows on one hub, and said first and second racks mesh with teeth of different rows. A sample suction / discharge device according to item 1. 4. The sample suction and discharge apparatus according to claim 1, wherein a pair of gears are connected so as to rotate synchronously in the same direction, and the first and second racks mesh with different gears. 5. The apparatus according to claim 1, wherein the second rack is one or two sheets.
A discharge operation button is connected to the other end of the first rack, which is supported by the base so as to advance and retreat in the direction opposite to the advance and retreat direction of the first rack while meshing with a set of gears, and has a piston connected to one end. By pressing the discharge operation button, the piston is pushed into the back of the cylinder via the first rack, while the piston is pushed in the same direction as the direction in which the discharge operation button is provided. A suction operation button is continuously provided at an end of the second rack, and the suction operation button is pushed in, so that the second rack, one or a pair of two gears, and a second gear which is counter to the second rack. 2. The sample suction / discharge device according to claim 1, wherein the piston is drawn out to the mouth of the cylinder via one rack. 6. The apparatus according to claim 1, wherein the second rack is the one or two sheets.
Supported by the base so as to advance and retreat in a direction intersecting with the advance and retreat direction of the first rack while meshing with a set of gears,
A discharge operation button is provided at one end of the second rack, and a suction operation button is provided at the other end, and the discharge operation button is pushed in. The piston is pushed into the back of the cylinder via a gear and the first rack, and the second rack, one sheet or two sheets is pressed by pushing the suction operation button.
2. The sample suction and discharge device according to claim 1, wherein the piston is drawn out to a mouth of the cylinder via a pair of gears and a first rack. 7. A gear train comprising a double gear having teeth arranged in two rows having different pitch circle radii, the first rack is meshed with a small-diameter tooth row, and a large-diameter second row of teeth is engaged. 7. The sample suction and discharge device according to claim 6, wherein the racks are engaged with each other. 8. The gear according to claim 6, wherein a pair of gears having different pitch circle radii are used, and said first rack is meshed with a small-diameter gear, and said second rack is meshed with a large-diameter gear. Sample suction and discharge device. 9. The method according to claim 1, wherein the second rack is the one or two sheets.
Supported by the base so as to advance and retreat in a direction intersecting with the advance and retreat direction of the first rack while meshing with a set of gears,
A discharge operation button is connected to the other end of the first rack having a piston connected to one end, and a suction operation button is connected to one end of the second rack, and the discharge operation button is pushed in. Thereby, the piston is pushed into the back of the cylinder through the first rack, and the piston is pushed into the mouth of the cylinder through the second rack, the gear and the first rack by pushing the suction operation button. 2. The sample suction and discharge device according to claim 1, wherein the sample suction and discharge device is drawn out.