JP6042764B2 - Pipette for syringe operation - Google Patents

Description

  The present invention relates to a pipette for syringe operation.

  The pipette for syringe operation described here is useful for discharging the liquid sucked into the syringe in several stages. These are also called dispensers or repeater pipettes. These pipettes have a mounting for the cylinder flange of the syringe at the lower end of the rod-shaped housing, and a movable mounting body with a piston mounting for the upper end of the piston rod of the syringe piston. Have in. The syringe can be inserted by the flange and the end of the piston rod through the axially oriented opening of the fixture. The flange and the end are held on the fixture by means for detachably holding. This means is for example configured as a gripping lever pulled by a spring. Furthermore, the pipette has a displacement means for displacing the mounting body. The displacement means can partially pull the piston from the cylinder to draw liquid into the syringe and can push the piston stepwise into the cylinder to discharge liquid in stages.

German Application Publication DE 2926691C2 US Application Publication US4406170A German Application Publication DE 44 37 716 C2 European Application Publication EP0679439B1 US Application Publication No. US5591408A European Application Publication EP0656229B1 US Application Publication US5620660A European Application Publication EP17224020B1 US Application Publication US7731908B2 European Application Publication EP0657216B1 European Application Publication No. US5620661A European Application Publication EP2033712A1 German application publication DE32112271A1 German application publication DE19541628C2

  Documents DE 2926691C2 and US 4406170A describe displacement means for displacing the mounting body of the housing. The displacement means includes a lift lever. The lift lever is connected to the mounting body and protrudes from the housing through a straight slit to aspirate liquid into the syringe by moving the mounting body spaced from the fixture . The means further comprises a toothed pawl device for stepwise piston forward movement by a reciprocating metering lever. The swivel claw is attached to the measuring lever. This toothed bar is connected to the mounting body and is arranged in the swivel area of the claw. In order to limit the engagement of the claw on the toothed bar as the metering lever swings, an adjustable movable cover somewhat covers the tooth row of the toothed bar. Furthermore, the toothed bar is designed with a certain contour, which allows the cover to move away from the toothed bar when the piston is in the advanced position, so that the tooth of the toothed bar where the pawl is not covered. Prevent from engaging. Thereby, the remaining amount is not discharged from the syringe. This amount is less than the measured amount that is to be dispensed at each metering step.

  Further developments of displacement means for displacing the mounting body are described in documents DE 44 37 716 C2, EP 06794439 B1 and US Pat.

  Further development of fixing means is described in documents EP0656229B1 and US5620660A. The documents EP17204020B1 and US7731908B2 describe a further development of a fixation device in which the syringe can be removed from the pipette using only one hand.

  Documents EP0657216B1 and US Pat. No. 5,620,661A describe such pipettes with sensors that determine the syringe associated with the protrusion and depth on the syringe flange. This sensor helps to measure the size of the used syringe. Based on the set step width, the electronic device measures the amount of liquid ejected at each ejection step. This is shown on the display.

  In a functional embodiment of the pipette, the mounting body is fixedly connected to a rigid cover piece that covers the slit from the inside. Since the cover piece extends upward from the mounting body, the cover piece covers only the slit above the lift lever. There is not enough space under the lift lever for additional cover pieces. When the lift lever is pushed upward, the cover piece moves upward in the housing, and the slit opens below the lift lever. In known pipettes, unexpected movement of the mounting body and the lift lever connected thereto is prevented. Here, the mounting body is braked by two elastic rubber hoses arranged in the pipette housing. A pipette of this kind is disclosed in EP2033712A1.

  The opened slit allows the inside of the casing to be observed and allows the dust to enter the housing. Dust contaminates the moving parts and, in some cases, the components of the pipette electronics.

  Document DE 3211271 A1 describes a slide bar control device with slits in the heating and exhaust actuating elements, particularly in motor vehicle air conditioning devices. In the slide bar control device, a tape is attached behind one or more slits, and its end is fixed to the bottom. The tape is guided through the through hole of the operating lever of the slide bar control device. Since the tape is arranged at a distance to the slit, there is a cavity between the slit and the tape, through which dust enters the bottom body. With the tape, no external light remains in the slide bar control device, and at the same time, the contamination of the internal structure is reduced by the tape.

  Document DE19541628C2 describes a sliding control device which is realized, for example, as a program selection lever for a sliding variable register, for changing the tension of a spring in a mechanical system or for an automatic gearbox of a motor vehicle. Yes. The sliding control device includes a housing having a slit, and a sliding block movable in and along the slit. The winding side and the entrainment side are attached to it and extend through the slit. The sliding control device has a flexible tape that extends only in the slit direction. The tape runs over the slit in the groove on the housing side facing the winding side and extends over the recess in the sliding block. At that end, the tape is secured to the housing. The distance between the fixed points is smaller than the length of the tape extending between them. The tape seals the slit at these positions in the slit. There are no sliding blocks here. Due to the arrangement of the sliding block on the outside of the housing, the tape can be easily contaminated and damaged. In one embodiment, the recess of the sliding block is realized by a slit formed laterally on the winding side of the sliding block. By arranging the slits on the sides, the tape can be taken out from the sides. Furthermore, the arrangement impairs the external appearance of the sliding block. According to another embodiment, the sliding block is formed by two essentially symmetrical halves that bear on each other. This half is composed of one half on the winding side and one half on the entrainment side. Here, a recess is formed in each one contact surface of both halves by a slit, and the depth corresponds to at least half of the tape width. Dividing the sliding block into two symmetrical halves requires great assembly. This is because half must be pushed to the narrow side of the tape. Furthermore, the outer appearance of the divided sliding block is impaired.

  Due to this, the present invention is based on the object of providing a pipette for operating a syringe with a housing without gaps.

  This object is achieved by a pipette having the features of claim 1. Advantageous embodiments of pipettes are indicated in the dependent claims.

Pipette for syringe operation of the present invention,
A rod-shaped housing;
A fitting that has an opening at the lower end of the housing and is placed in a syringe with a fixed portion at the upper edge of the cylinder;
An attachment body having other attachments and other openings at the lower end of the housing, and being put into other fixed parts of the piston of the syringe;
Holding means for detachably holding the fixing portion to the fixture and the other fixing portion to the other fixture;
Displacement means for displacing the mounting body in the housing in the longitudinal direction of the housing,
A pipette for operating a syringe having a lift lever that operates from the outside of the housing, the lift lever being connected to a mounting body via a connecting element, and the connecting element gripping through a straight slit extending in the longitudinal direction of the housing Because
Under the slit of the housing, a cover piece covering the slit is held in two positions separated from each other in the longitudinal direction of the slit in the housing,
The connecting element has a channel, and the cover piece is guided over the channel when the lift lever is displaced .

  In the pipette of the present invention, the slit can always be covered with the cover piece regardless of the position in the housing where the mounting body occupies. This is achieved by the cover piece covering the slit from below and being held in a position spaced apart in the longitudinal direction of the slit within the housing. However, the cover piece is not connected to the housing on both sides of the slit. Furthermore, the connecting element comprises a channel through which the cover piece extends. As a result, when the mounting body is displaced by actuating the lift lever, the connecting element is guided along cover pieces that cover the slits on both sides of the connecting element. Thus, the slit can be completely covered at each position of the lift lever. Therefore, the inside is observed across the slit, and dust does not enter the apparatus. By placing the tape inside the slit, it is possible to surround the strictly rod-shaped housing by the user's hand or to avoid contamination or damage of the tape due to other environmental influences.

  According to one embodiment of the pipette, the displacement means for displacing the mounting body and / or fixed to these displacement means, so that the lift lever does not move automatically along the slit when the pipette is oriented vertically. Friction between other components that are movable in the connected housing and components that are fixedly arranged in the housing is sized as required.

  Thus, the friction brake is realized. The friction brake prevents unexpected displacement of the mounting body and the lift lever connected to it without the need for further components.

  According to a preferred embodiment, if the pipette is oriented vertically, the friction is sized as necessary so that the lift lever does not move automatically along the slit. According to a preferred embodiment, the friction is sized as necessary so that the lift lever does not move automatically when the vertically oriented pipette is moved by the user. The magnitude of the friction is preferably adapted to the normal gentle movement of the user when pipetting, carrying, using and setting. Displacement of the lift lever under the influence of gravity acting on the lift lever, and possibly under the influence of acceleration forces, due to the effective friction between the movable component and the component fixedly arranged in the housing Is prevented. According to a preferred embodiment, when the pipette is oriented vertically, even if the pipette is not equipped with a syringe, the friction is sized so that the lift lever does not move automatically along the slit. Is done. In this case, the displacement of the lift lever is not offset by friction between the syringe piston and the syringe cylinder.

  A further advantage of the present invention is that the friction between the movable component and the component fixedly arranged in the housing can be measured by guiding the cover piece over the channel. According to an embodiment of the invention, the friction between the connecting element and the cover piece is sized to prevent the lift lever from automatically moving along the slit when the pipette is oriented vertically. Alternatively, this friction is sized as required depending on the friction between components that are movable in another set of housings and components that are fixedly disposed within the housing.

  The friction between the cover piece and the connecting element depends in particular on the material of the cover piece and the connecting element, the geometry and size of the channel and cover piece, and the bias with which the cover piece is held in the housing. These parameters can be set so that the friction meets the above criteria.

  According to another embodiment, one is movable in the housing and the other is fixedly arranged in the housing, both of which cause friction between a set of components different from the connecting element and the cover piece. The lift lever is sized as required so that it does not move automatically along the slit when the is oriented vertically. This set of components is in particular fixedly connected to the toothed bar for displacing the mounting body in the housing and fixedly connected to the housing, and is mounted by supporting the turning lever of the claw driving device of the toothed bar. It may be a bearing block. Furthermore, this set of components may be a lift lever or connecting element movable relative to the housing and the housing itself. The friction between the movable component and the component that is fixedly connected to the housing also prevents the lift lever from moving automatically along the slit when the pipette is oriented vertically. You may make it a required magnitude | size with the friction with a piece.

  The present invention includes a rigid cover piece. According to a preferred embodiment, the cover piece is flexible. The flexible cover piece or cover tape is preferably held under tension between two positions spaced apart in the longitudinal direction of the slit.

  According to a further embodiment, the cover piece is an elastic body. Since the elastic body is realized, the cover piece can extend, so that it does not break even when a load is applied in the longitudinal direction. The load on the longitudinal cover piece can be caused, for example, by slightly tilting the lift lever.

  According to one embodiment, the cover piece is flexible and the channel of the connecting element has a flat U-shaped path in the longitudinal direction of the cover piece, so that the cover piece of the channel runs continuously to the connecting element Deflection from. Bearing the flexible cover piece close to the edge of the slit is advantageous for the U-shaped path of the channel. The reason is that the upper limit of the channel can be displaced away from the edge of the slit. By allowing the flexible cover piece to be supported close to the edge of the slit, dust can be effectively prevented from entering the housing. Furthermore, depending on the shape of the channel, the flexible cover piece arches towards the edge of the slit on both sides of the connecting element. The deflection of the channel cover pieces increases the friction between the cover tape and the connecting element. This friction prevents unexpected displacement of the mounting body of the housing.

  According to a further embodiment, the channel of the connecting element runs in a curve and its opening enters along the surface of the unflexed part of the cover piece. As a result, the cover piece moves smoothly into the channel and extreme friction between the connecting element and the cover piece when the lift lever is moving is avoided.

  According to a further embodiment, the mounting body is fixedly connected to at least one support element. This support element is supported by a support portion (groove) of the housing. The support is oriented parallel to the plane intersecting the portion of the cover piece outside the connecting element. The force acting on the lift lever is deflected to the housing via the support element and the support recovery part. Therefore, this avoids overloading of the cover piece.

  According to a further embodiment, the support element is a wing. The wing protrudes on a different side of the mounting body in a plane parallel to the plane in which the cover piece is continuously arranged up to the connecting element and engages in a parallel groove inside the opposite wall of the housing To do. The wing can support and guide the mounting body uniformly in the housing.

  According to a further embodiment, the connecting element has flutes that engage the slits. This groove stone can guide the connecting element into the slit.

  According to a further embodiment, the connecting element has a lift lever mount fixedly connected to the mounting body and arranged in the housing, and a lift lever carrier gripped through the slit and connected to the lift lever. . Here, the channel is formed between the lift lever mount and the lift lever carrier. This design is advantageous for creating a channel, particularly when the channel has a curved path.

  In a further embodiment, one wall of the channel is the side of the lift lever mount and the opposite wall of the channel is the other side of the lift lever mount. According to a further embodiment, the lift lever mount and the lift lever carrier are joined in the region of the channel so that they together form a channel. This facilitates the manufacture of the channel. Furthermore, assembly is advantageous, especially in this embodiment. This is because the lift lever carrier and the lift lever mount can be set on the flat side of the cover piece when they are joined. Furthermore, it is advantageous that the joining area or contact surface of the lift lever mount and the lift lever carrier are each arranged in the housing so that the joining area or contact face does not interfere with the exterior appearance of the lift lever. .

  According to a further embodiment, the lift lever carrier has flutes.

  According to a further embodiment, the cover piece is held in two spaced positions on the two ends of the slit and / or outside the two ends.

  According to a further embodiment, the cover piece is positively fitted, adhesively bonded or improperly fitted in the housing in one or more of the following ways on and / or outside the two ends of the slit: Fixed by.

  According to a further embodiment, the cover piece is fixed to a pin eye or ear protruding from the inside of the housing. The cover piece can be adhesively bonded to the housing by heat caulking. Fast fixing with a suitable fixing device makes it possible to fix by inadequate fitting. A combination of all three fastening methods is shown, for example, in that the plastic pin holding the cover piece in the eye is pressed flat by heat, so that the pin melts with the cover piece. , Receive the bias and support the outside of the cover piece.

  According to a further embodiment, the cover piece is elastic in the longitudinal direction and / or is tensioned by a spring. Thus, by supporting the cover piece closer to the edge of the slit, an attractive outer appearance can be achieved and the inner housing can be better protected from contamination.

  According to a further embodiment, the housing and the cover piece are made of the same plastic material. An attractive outer appearance is thereby further preferred. Both the housing and the cover piece are preferably made from polypropylene.

  According to a further embodiment, the housing and the cover piece are made from different materials. For example, wear properties, flexibility, and color are affected by the choice of cover piece material. For example, if it is intended to increase the braking effect of friction, it is necessary to improve the wear characteristics. Furthermore, it is possible to adapt the surface properties of the cover pieces, in particular the roughness, to specific requirements. The cover piece may be made of, for example, polyvinylidene fluoride (PVDF) or polycarbonate.

  The holding means for holding the fixing part of the fixture and the other fixing part of the other fixture may be configured as described in one of the prior art documents mentioned at the beginning. preferable. The displacement means for displacing the mounting body within the housing is preferably configured as described in one of the prior art documents mentioned at the outset. In this respect, reference is made to the documents mentioned at the beginning, namely DE 2926691C2, US 4406170A, DE 4437716C2, EP 0679439B1, US 5561408A, EP 0562229B1, US 5620660A, EP 17240620B1, US 731908B2, EP 0657216B1, US 5620661A. These subjects are incorporated into this application by reference.

The present invention will be described in more detail below with the aid of the accompanying drawings of exemplary embodiments.

It is the perspective view seen from the side of the pipette of this invention with which the syringe is hold | maintained. It is sectional drawing of the longitudinal direction of the same pipette. FIG. 4 is a partially enlarged sectional view in the longitudinal direction of a mounting body, a connecting element, a lift lever and a cover tape with the same pipette toothed bar. It is the fragmentary perspective view seen from the side of the same structure. It is the fragmentary perspective view which looked at the housing half part of the pipette of the same structure from another side. It is the perspective view seen from the side of the lift lever mount. It is the perspective view seen from another side of the lift lever carrier. It is the perspective view seen from the side of the lift lever carrier provided with the inserted cover tape. FIG. 6 is a further perspective view of a lift lever carrier with an inserted cover tape.

  In this application, the descriptions “up” and “down” relate to the orientation of the pipette. That is, the rod-shaped housing is vertically oriented, and the syringe fixture is arranged on the lower side.

  According to FIG. 1, the pipette 1 has a rod-shaped housing 2, in which a syringe 3 is held on the lower side. From the side wall of the housing 2, the lift lever 5 projects from the housing 2 onto the straight slit 4. An actuating button 8 that controls the pawl of the toothed bar projects from the same side wall of the housing onto two further slits 6,7. On top of that, the liquid crystal display 9 is buried in the countersink and enters the same side wall of the housing 2. An arcuate portion of the dial 10 protrudes from an opening in the adjacent side wall.

  According to FIG. 2, the syringe 3 has a cylinder 11 and a piston 12 movably disposed therein. The cylinder 11 has a conical portion 13 having a liquid flow passage hole 14 on the lower side, and a cylindrical portion 15 on which the piston 12 can be displaced. On the upper side, the cylinder 11 has a fixing part 16 with a peripheral flange 17. A piston rod 18 projects upward from the piston 12. The piston rod 18 has another fixed part 19 with several peripheral bulges (not shown).

  The syringe 3 is disposed at the lower end portion of the housing 2 with the flange 17 in the fixture 20, and has an opening 21... That is oriented in the axial direction for inserting and withdrawing the syringe 3 at the lower end portion of the housing 2. 1 At its upper part, the syringe 3 presses the pressure-sensitive ring sensor 22. The ring sensor 22 scans the protrusion at the upper edge of the flange 17. The flange 17 is held in this position in the housing 2 using the grip lever 23.

  The other fixing portion 19 of the piston 12 is disposed on the other fixture 24 of the hollow cylindrical mounting body 25. The other fixture 24 has another opening 21.2 facing in the axial direction for inserting the fixing part 19. The other fixing portion 19 is held by another gripping lever 26. The grip lever 26 engages between the bulges of the other fixing portions 19 or fastens the fixing portions 19 inside.

  The mounting body 25 is fixedly connected to the toothed rod 27. The toothed rod 27 extends below the longitudinal slit 4 of the housing 2.

  The lift lever mount 28 is fixed to the lower portion of the tooth bar 27 on the mounting body 25.

  In addition, there is a lift lever carrier 29. The lift lever carrier 29 supports the lower side of the edge of the slit 4 provided with the sliding plate 30. The lift lever carrier 29 has a support column 31 protruding upward, and the support column 31 grips through the slit 4. Outside the housing 2, the lift lever 5 is fixed to the column 31.

  In the upper half of the housing 2, a metering lever 34 is pivotally attached to a hinge bearing 32 in a bulge 33 on the side wall of the housing 2 facing the slit 4. The metering lever 34 has two spaced legs 35, 36. The leg portions 35 and 36 stand from two slits 6 and 7 on the opposite side walls of the housing 2. An actuating button 8 is fixed on the projecting ends of the legs 35,36.

  A claw 37 is pivotally mounted between the two legs 35 and 36 of the measuring lever 34. The claw 37 is provided above the teeth 39 of the toothed bar 27 with pawl teeth 38. The measuring lever 34 is pressed to the position shown in FIG. 2 by a spring device (not shown). Contrary to the action of the spring device, the metering lever 34 can be swung downwards by activating the actuating button 8. The claw 37 is pushed toward the teeth 39 of the toothed rod 27 by another spring device (not shown).

  A movable cover 40 is disposed between the claw 37 and the toothed rod 27. By rotating the dial 10 that protrudes laterally from the housing 2, the cover 40 can be moved, so that the cover 40 approximately covers the teeth 39 of the toothed rod 27.

  Furthermore, a circuit board 41 provided with an electronic device is disposed in the upper half of the housing 2. A power supply in the form of a battery or storage battery 42 is also installed here.

  Another sensor 43 that acquires the position of the dial 10 is designated as the dial 10. Measurement values measured by the ring sensor 22 and the other sensors 43 are transferred to the electronic device via a cable.

  The code displayed on the flange 17 indicates the size of each syringe 3. The electronic device determines the size of each syringe from the measurement signal provided by the ring sensor 22, and determines the respective step width from the setting of the dial 10. From these, the electronic device calculates the set metering volume and displays it on the display 9.

  On the inside, the slits 6, 7 are covered by a diaphragm 44 connected to the metering lever 34.

  According to FIGS. 3 to 5, a flexible cover piece 45 is present under the slit 4 in the housing 2 in order to cover the slit 4. The cover piece 45 is made of polypropylene. According to FIG. 8, the cover piece 45 has eye holes 46 and 47 at its ends. The eye holes 46, 47 are fixed to the pins 48, 49 according to FIG. The pins 48 and 49 protrude from the inside of the side wall of the housing 2 having the slit 4.

  According to FIGS. 3 to 5, the cover piece 45 passes through a channel 50 between the lift lever mount 28 and the lift lever carrier 29. According to FIGS. 6 and 7, the channel 50 is restricted on both sides by the rounded side surface 51 of the lift lever mount 28 and by the other rounded side surface 52 of the lift lever carrier 29. The two lateral boundaries of the channel 50 are formed by the two strip-like side walls 53, 54 of the lift lever carrier 29. These are connected to each other by a cross member 55 at a distance from the rounded side surface 52. The lift lever carrier has a through hole 56 between the other side surface 52 having a roundness and the cross member 55. Two protrusions 57 and 58 protrude from one side of the cross member 55. The protrusions 57, 58 can enter the recesses 59, 60 corresponding to the lift lever mount 28. The two strip-shaped side walls 53 and 54 are connected by the front wall 61. The front wall 61 has a further side surface 52 which is rounded on the lower side, from which the column 31 protrudes on the upper side.

  According to FIGS. 8 and 9, the lift lever carrier 29 can be preassembled with the cover piece 45 by guiding the cover piece 45 along the other side 52 over the through hole 56, so that the lift lever carrier 29 Passes between the two strip-shaped side walls 53 at the top of the cross members 54 and 55. In this configuration, the lift lever carrier 29 can be connected to the lift lever mount 28 by inserting the protrusions 57, 58 into the recesses 59, 60, and the lift lever carrier 29 and the lift lever mount 28 are glued together. Or snapped together by suitable snap-fit means. Next, the cover piece 45 is disposed between the side surface 51, the other side surface 52, and the side walls 53, 54 in the channel 50. On one side next to the lift lever carrier 29, the cover piece 45 is placed on the protruding rib 51.1 of the lift lever mount 28. The protruding rib 51.1 extends in the longitudinal direction of the slit 4 (compare FIGS. 4 to 6).

  The lift lever mount 28 and the lift lever carrier 29 together form a connecting element 62 between the mounting body 25 and the lift lever 5 (compare FIGS. 2, 3 and 4).

  4 and 5, the lift lever mount 28 has wings (support elements) 63 and 64 protruding from both sides. In this example, the wings 63 and 64 have a cylindrical shape. These engage the grooves 65, 66 on the two opposite side walls of the housing 2. The grooves 65, 66 are constrained on the one hand by the half edge of the housing and on the other hand by the ledge of the chassis to which the drive machine parts of the pipette 1 are attached.

  According to FIG. 2, the cover piece 45 is held in the eye holes 46, 47 in a state of being extended inside the slit 4 by the two pins 48, 49 according to FIGS.

  According to FIG. 3, the cover piece 45 is arched in a plane extending on both sides of the channel 50 due to the roundness of the side surfaces 51, 52 of the channel 50. Thereby, the cover piece 45 is supported in proximity to the edge of the slit 4.

  In order to absorb the liquid through the opening 14 of the syringe 3, the lift lever 5 is pushed upward from the position of FIGS. 1 and 2. The absorbed liquid can be discharged in a few steps by repeatedly pressing the operating button 8 downward against the action of the spring device. Here, until the pawl teeth 38 reach the lower end of the cover 40, another spring device presses the pawl 37 having the pawl teeth 38 against the cover 40. Thereafter, the claw 37 descends and enters the tooth 39 of the tooth bar 27 together with its pawls 38, and when the measuring lever 34 swings further downward, the tooth bar 27 is somewhat taken in. Here, the displacement of the tooth bar 27 at the time of each swinging of the measuring lever 34 until it stops lower depends on the position of the cover 40 set using the dial 10. After the load on the actuating button 8 has been reduced, the actuating button 8 can be pushed upwards by a spring device and further metering steps can be performed. This is possible for a long time until the residual amount of liquid remaining in the syringe 3 is less than the set measurement amount. By fixing the remaining stroke, the cover 40 swings with respect to the lower side of the claw 37, so that the pawl teeth 38 cannot descend and enter the teeth 39.

  When the lift lever 5 is displaced, the cover piece 45 is guided over the channel 50. The slit 4 is always covered. Unexpected displacement of the connecting element comprising the mounting body 25 and the lift lever 5 is offset by the friction between the cover piece 45 and the connecting element.

1 Pipette 2 Housing 3 Syringe 4 Slit 5 Lift lever 6 Slit 7 Slit 8 Actuation button 9 Display 10 Dial 11 Cylinder 12 Piston 13 Part 14 Hole 15 Part 16 Fixing part 17 Flange 18 Piston rod 19 Fixing part 20 Mounting tool 21.1 Opening Portion 21.2 Opening 22 Ring Sensor 23 Grip Lever 24 Fixture 25 Mounting Body 26 Grip Lever 27 Toothed Rod 28 Lift Lever Mount 29 Lift Lever Carrier 30 Sliding Plate 31 Post 32 Hinge Bearing 33 Bulge 34 Weighing Lever 35 Leg Part 36 leg part 37 nail 38 nail tooth 39 tooth 40 cover 41 circuit board 42 storage battery 43 sensor 44 diaphragm 45 cover piece 46 eye hole 47 eye hole 48 pin 49 pin 50 channel 51 side surface 51.1 rib 52 side surface 53 side Wall 54 Side wall 55 Cross member 56 Through hole 57 Projection 58 Projection 59 Depression 60 Depression 61 Wall 62 Connection element 63 Wing 64 Wing 65 Groove 66 Groove

Claims (18)

A rod-shaped housing (2);
An attachment (20) to be placed in a syringe (3) having an opening (21.1) at the lower end of the housing (2) and having a fixing part (16) at the upper edge of the cylinder (11);
The lower end of the housing (2) has another attachment (24) and another opening (21.2), and is put into another fixing part (19) of the piston (12) of the syringe (3). A mounting body (25);
Holding means (23, 26) for detachably holding the fixing portion (16) to the fixture (20) and the other fixing portion (19) to the other fixture (19);
Displacement means (5, 8, 34, 37, 27) for displacing the mounting body (25) in the longitudinal direction of the housing (2) in the housing (2),
The lift lever (5) is operated from the outside of the housing (2), and the lift lever (5) is connected to the mounting body (25) via a connection element (62), and the connection element (62) is a housing. (2) a pipette for operating a syringe that is gripped through a straight slit (4) extending in the longitudinal direction;
Under the slit (4) of the housing (2), two positions (48, 49) in which the cover piece (45) covering the slit is separated from each other in the longitudinal direction of the slit (4) in the housing (2). )
Pipette characterized in that the connecting element (62) has a channel (50), and when the lift lever (5) is displaced, the cover piece (45) is guided over the channel (50) . If the pipette is oriented vertically such that said lift lever (5) does not move automatically along the slit (4), displacement means for displacing the mounting body (25) (5,8,34 , 37, 27) and / or other components movable in the housing fixedly connected to the displacement means and the components fixedly arranged in the housing require friction. The pipette of claim 1 sized.   When the pipette is oriented vertically, friction between the connecting element (62) and the cover piece (45) is necessary so that the lift lever (5) does not move automatically along the slit (4). Depending on the friction between the components that are sized or moved in another set of housings (2) and the components that are fixedly arranged in the housing (2), 3. Pipette according to claim 2, wherein the friction is sized as required.   Pipette according to any one of claims 1 to 3, characterized in that the cover piece (45) is flexible.   5. Pipette according to claim 4, characterized in that the channel (50) of the connecting element (62) has a flat U-shaped path in the longitudinal direction of the cover piece (45).   6. The channel (50) of the connecting element (62) runs in a curved line and its opening enters along the surface of the bent part of the cover piece (45). Pipette according to crab.   The mounting body (25) is fixedly connected to at least one support element (63, 64) supported by the support (65, 66) of the housing (2), and the support (65, 66) is Pipette according to any one of the preceding claims, characterized in that it is oriented parallel to a plane intersecting the part of the outer cover piece (45) of the connecting element (62).   Said support elements (63, 64) are wings, which wings in a plane parallel to the plane in which the cover pieces (45) are arranged continuously to the connection elements (62), Pipette according to claim 7, characterized in that it protrudes on different sides of the housing (2) and engages in supports (65, 66) which are parallel grooves inside the opposing walls of the housing (2). .   Pipette according to any one of the preceding claims, characterized in that the connecting element (62) has a flutes that engage the slits (4).   The connecting element (62) is fixedly connected to the mounting body (25) and is connected to the lift lever mount (28) disposed in the housing (2), and the lift lever ( 5. A lift lever carrier (29) connected to 5), the channel (50) being formed between the lift lever mount (28) and the lift lever carrier (29). The pipette according to any one of 1 to 9.   One wall of the channel (50) is the side (51) of the lift lever mount (28) and the opposite wall of the channel is the other side (52) of the lift lever carrier (29). 11. Pipette according to claim 10, characterized.   12. Pipette according to claim 11, characterized in that the lift lever mount (28) and the lift lever carrier (29) are joined components.   13. Pipette according to any one of claims 9 to 12, characterized in that the lift lever carrier (29) has groove stones.   2. The cover piece (45) is held in two spaced positions (48, 49) outside the two ends and / or outside the two ends of the slit (4). 14. The pipette according to any one of 13.   The cover piece (45) is positively fitted into the housing (2), adhesively bonded, or at the two ends of the slit (4) and / or outside thereof in one or more of the following ways: The pipette according to any one of claims 1 to 14, wherein the pipette is fixed by uncertain fitting.   16. Pipette according to claim 15, characterized in that the cover piece is fixed to the eye holes (46, 47) or ears on pins (48, 49) protruding from the inside of the housing (2).   17. Pipette according to claim 1, wherein the cover piece (45) is elastic in the longitudinal direction and / or is tensioned in the longitudinal direction by a spring.   18. Pipette according to claim 1, wherein the housing (2) and the cover piece (45) are made of the same plastic material or different plastic materials.

Images