Pipettor with maximum range reset by one key

Abstract

The utility model provides a one-key reset maximum-range pipettor, which comprises a shell, a suction tube, a liquid suction cavity, a piston, an adjusting rod, a rotating shaft, a handle and a volute spiral spring box, the suction tube is arranged at the bottom of the shell and communicated with the bottom end of the liquid suction cavity, the piston is matched in the liquid suction cavity in a sliding manner, the top end of the adjusting rod is pivoted with the rotating shaft, and the handle is connected with the rotating shaft in a sliding manner. The bottom end of the adjusting rod is in threaded connection with the piston, the handle is coaxially connected with the rotating shaft, the position, between the rotating shaft and the shell, of the handle is sleeved with a first spring, and the adjusting rod penetrates through the center of the volute spiral spring box and is coaxially connected with a volute shaft in the volute spiral spring box. When the range of the piston needs to be reset, only the shifting block needs to be shifted upwards, the shifting block is in linkage with the upper gear ring through the movable plate to be separated from the lower gear ring, at the moment, the adjusting rod can rotate independently, the adjusting rod rotates reversely towards the reset point under the tension of the volute spiral spring, and rapid range reset is achieved. And the resetting efficiency is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically a pipette with one-button reset for maximum capacity. Background Technology

[0002] A pipette is a commonly used tool in laboratories for the precise transfer of liquid samples or reagents. It typically consists of a handle and a replaceable tip. In clinical laboratories, pipettes are frequently used for processes such as sample dilution, mixing, and solution preparation. It can precisely transfer the required volume of sample or reagent, ensuring the accurate concentration and composition of the solution. The working principle of a pipette is that the piston achieves liquid aspiration and dispensing through the extension and retraction of a spring. Under the push of the piston, some air is expelled, and liquid is drawn in using atmospheric pressure. Then, the piston pushes the air to expel the liquid.

[0003] When using a pipette, the inspector assembles the handle and the tip, and then rotates the top button to adjust the volume. However, before each adjustment, if the required volume is significantly different from the previous volume, it is necessary to manually rotate the button in reverse to reset and adjust, which is very time-consuming and laborious. Summary of the Invention

[0004] Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a pipette with a one-button reset maximum capacity, thus solving the problems mentioned in the background section.

[0006] Technical solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a pipette with one-button reset for maximum capacity, comprising a housing, a pipette, a suction chamber, a piston, an adjusting rod, a rotating shaft, a handle, and a spiral spring box. The pipette is located at the bottom of the housing and is connected to the bottom end of the suction chamber. The piston is slidably fitted within the suction chamber. The top end of the adjusting rod is pivotally connected to the rotating shaft, and the bottom end is threadedly connected to the piston. The handle is coaxially connected to the rotating shaft. A spring is fitted on the handle between the rotating shaft and the housing. The adjusting rod passes through the center of the spiral spring box and is coaxially connected to the spiral shaft inside the spiral spring box. The spiral spring box is vertically slidably fitted within the housing via a sliding assembly. A clutch device is provided between the rotating shaft and the adjusting rod.

[0008] Preferably, the clutch device includes an upper gear ring, a lower gear ring, a fixed plate, a movable plate, and a lever. The rotating shaft is pivotally connected to the fixed plate via a bearing. The upper gear ring is pivotally connected to the center of the movable plate via a bearing. The side of the movable plate is vertically slidably fitted into the housing. The outer part of the rotating shaft has a polygonal structure. The inner ring of the upper gear ring is a polygon that can slide axially onto the rotating shaft. The lower gear ring is mounted on the adjusting rod and corresponds to it vertically. The upper and lower gear rings can mesh with each other. A second spring is provided between the movable plate and the fixed plate. The lever is connected to the movable plate.

[0009] Preferably, the upper and lower toothed rings are each provided with a ring of interlocking triangular teeth.

[0010] Preferably, the piston has a threaded hole at its top, and the lower section of the adjusting rod has a threaded section that matches the threaded hole.

[0011] Preferably, the sliding assembly includes a guide rail vertically disposed within the housing, and a guide block slidably adapted to the guide rail is disposed on the side of the spiral spring box. Beneficial effects

[0012] This invention provides a pipette with a one-button reset maximum volume. It offers the following advantages:

[0013] This one-button reset maximum volume pipette allows for quick volume reset when the piston needs to be reset. Simply move the lever upwards, and the lever will disengage from the lower gear ring via the movable plate. At this point, the adjusting rod can rotate independently. Under the tension of the spiral spring, the adjusting rod rotates in the opposite direction towards the reset point, achieving rapid volume reset. Compared to the traditional method of resetting by rotating the handle counterclockwise, the reset efficiency is greatly improved. Attached Figure Description

[0014] Figure 1 This is a half-sectional isometric view of the present invention;

[0015] Figure 2 This is an external isometric view of the present invention;

[0016] Figure 3 This is a side sectional plan view of the present invention.

[0017] In the diagram: 1. Housing, 2. Suction tube, 3. Suction chamber, 4. Piston, 5. Adjusting rod, 6. Rotating shaft, 7. Handle, 8. Spring I, 9. Threaded section, 10. Threaded hole, 11. Scroll spring box, 12. Guide rail, 13. Guide block, 14. Upper toothed ring, 15. Lower toothed ring, 16. Fixed plate, 17. Movable plate, 18. Bearing, 19. Spring II, 20. Pulley. Detailed Implementation

[0018] This utility model embodiment provides a pipette with a one-button reset maximum capacity, such as... Figure 1-3 As shown, it includes a housing 1, a straw 2, a suction chamber 3, a piston 4, an adjusting rod 5, a rotating shaft 6, a handle 7, and a spiral spring box 11.

[0019] The suction chamber 3 is vertically positioned at the bottom of the housing 1. The suction tube 2 is located at the bottom of the housing 1 and is connected to the bottom end of the suction chamber 3. The piston 4 is slidably fitted inside the suction chamber 3. The top end of the adjusting rod 5 is pivotally connected to the rotating shaft 6 via a bearing, and the bottom end is threadedly connected to the piston 4. Specifically, the top of the piston 4 has a threaded hole 10, and the lower section of the adjusting rod 5 has a threaded section 9 that matches the threaded hole 10. The cross-sections of the suction chamber 3 and the piston 4 are non-circular polygonal structures, so that when the adjusting rod 5 rotates, the piston 4 moves along the length of the suction chamber 3.

[0020] like Figure 1 As shown, handle 7 is coaxially connected to rotating shaft 6. The diameter of handle 7 is smaller than that of rotating shaft 6. A spring 8 is sleeved on handle 7 between rotating shaft 6 and housing 1. Spring 8 is used to reset handle 7 after it is pressed down. The scroll spring box 11 is an existing mature product, similar to a spring structure. Its center is a scroll shaft, and a scroll spring is wound on the scroll shaft. Adjusting rod 5 passes through the center of scroll spring box 11 and is coaxially connected to the scroll shaft inside scroll spring box 11. When adjusting rod 5 rotates in the direction of larger adjustment range, it will drive the scroll shaft to tightly wind the scroll spring. Scroll spring box 11 is vertically slidably adapted to housing 1 by sliding assembly. When adjusting rod 5 is displaced, scroll spring box 11 can move in conjunction with it. At the same time, sliding assembly is also used to limit the rotation of the outer shell of scroll spring box 11. Sliding assembly includes guide rail 12 vertically arranged in housing 1, and guide block 13 slidably adapted to guide rail 12 on the side of scroll spring box 11.

[0021] A clutch device is provided between the rotating shaft 6 and the adjusting rod 5.

[0022] like Figure 1 As shown, the clutch device includes an upper gear ring 14, a lower gear ring 15, a fixed plate 16, a movable plate 17, and a lever 20. The rotating shaft 6 is pivotally connected to the fixed plate 16 via bearings. The upper gear ring 14 is pivotally connected to the center of the movable plate 17 via bearings 18. The side of the movable plate 17 slides vertically within the housing 1. The outer ring of the upper gear ring 14 is pivotally connected to the center of the movable plate 17 via bearings 18. The outer part of the rotating shaft 6 has a polygonal structure, and the inner ring of the upper gear ring 14 is a polygon that can slide axially onto the rotating shaft 6. The lower gear ring 15 is mounted on the adjusting rod 5 and corresponds vertically to the upper gear ring 14. The upper gear ring 14 and lower gear ring 15 can mesh with each other. Each of the upper gear ring 14 and lower gear ring 15 has a ring of interlocking triangular teeth. A spring 29 is installed between the movable plate 17 and the fixed plate 16, and the lever 20 is connected to the movable plate 17.

[0023] Under normal conditions, the upper gear ring 14 engages with the lower gear ring 15 under the action of the spring 19, enabling the rotating shaft 6 and the adjusting rod 5 to rotate and move axially synchronously. During adjustment, the adjusting rod 5 will cause the scroll spring in the scroll spring box 11 to tighten. When it is necessary to reset the range of the piston 4, simply move the lever 20 upward. The lever 20, through the movable plate 17, links the upper gear ring 14 to disengage from the lower gear ring 15. At this time, the adjusting rod 5 can rotate independently. Under the tension of the scroll spring, the adjusting rod 5 rotates in the opposite direction towards the reset point, achieving rapid range reset. Compared with the traditional method of resetting by rotating the handle 7 counterclockwise, the reset efficiency is greatly improved.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pipette with one-button reset maximum volume, characterized in that: The device includes a housing (1), a straw (2), a suction chamber (3), a piston (4), an adjusting rod (5), a rotating shaft (6), a handle (7), and a spiral spring box (11). The straw (2) is located at the bottom of the housing (1) and is connected to the bottom end of the suction chamber (3). The piston (4) is slidably fitted inside the suction chamber (3). The top end of the adjusting rod (5) is pivotally connected to the rotating shaft (6), and the bottom end is threadedly connected to the piston (4). The handle (7) is coaxially connected to the rotating shaft (6). A spring (8) is sleeved on the handle (7) between the rotating shaft (6) and the housing (1). The adjusting rod (5) passes through the center of the spiral spring box (11) and is coaxially connected to the spiral shaft inside the spiral spring box (11). The spiral spring box (11) is vertically fitted inside the housing (1) through a sliding assembly. A clutch device is provided between the rotating shaft (6) and the adjusting rod (5).

2. The pipette with one-button reset maximum capacity according to claim 1, characterized in that: The clutch device includes an upper toothed ring (14), a lower toothed ring (15), a fixed plate (16), a movable plate (17), and a lever (20). The rotating shaft (6) is pivotally connected to the fixed plate (16) via a bearing. The side of the movable plate (17) is vertically slidably adapted to the housing (1). The outer ring of the upper toothed ring (14) is pivotally connected to the center of the movable plate (17) via a bearing (18). The outer part of the rotating shaft (6) is a polygonal structure. The inner ring of the upper toothed ring (14) is a polygonal structure that can be axially slidably adapted to the rotating shaft (6). The lower toothed ring (15) is set on the adjusting rod (5) and corresponds vertically to the upper toothed ring (14). The upper toothed ring (14) and the lower toothed ring (15) can mesh with each other. A spring (19) is provided between the movable plate (17) and the fixed plate (16). The lever (20) is connected to the movable plate (17).

3. A pipette with one-button reset maximum capacity according to claim 2, characterized in that: The upper toothed ring (14) and the lower toothed ring (15) are each provided with a ring of triangular teeth that can interlock with each other.

4. The pipette with one-button reset maximum capacity according to claim 1, characterized in that: The piston (4) has a screw hole (10) at the top, and the lower section of the adjusting rod (5) has a threaded section (9) that matches the screw hole (10).

5. A pipette with one-button reset maximum capacity according to claim 1, characterized in that: The sliding assembly includes a guide rail (12) vertically disposed within the housing (1), and a guide block (13) slidably adapted to the guide rail (12) is disposed on the side of the spiral spring box (11).

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