A manually adjustable pipette

Abstract

The utility model relates to the technical field of pipettor, and specifically relates to a manually adjustable pipettor, which comprises a handle, a knob is rotatably connected to the handle, the knob is fixed through a limiting structure, the limiting structure comprises a limiting column, the limiting column is fixedly connected to the knob, a plurality of limiting grooves are arranged on the limiting column, the plurality of limiting grooves are distributed in a circumferential array about the center of the knob, a push block is slidably connected to the handle, a limiting rod is fixedly connected to the push block, and the limiting rod is clamped with one of the limiting grooves. Through the clamping of the limiting rod and different limiting grooves, the knob can be accurately fixed at different rotation angles, rotation caused by hand touching after adjustment is avoided, and the stability of the range is ensured.

Description

Technical Field

[0001] This utility model relates to a pipette, specifically a manually adjustable pipette, and belongs to the field of pipette technology. Background Technology

[0002] In microbial culture experiments, the manually adjustable pipette is a core tool for accurately transferring trace or large volumes of liquids (such as culture media, bacterial suspensions, reagents, etc.). It typically consists of a handle, an adjustable volume knob, a conical pipette tip for aspirating liquid, and a piston assembly for controlling aspiration and dispensing. The operator adjusts the piston stroke by rotating the knob to set the volume, and then drives the piston by pressing to use air pressure changes to complete aspiration and dispensing. With its flexibility and ease of operation, the manually adjustable pipette is widely used in scenarios such as microbial inoculation, reagent preparation, and drug sensitivity testing, and is a key tool to ensure the accuracy of liquid transfer during experiments.

[0003] However, when existing manual adjustable pipettes are used in microbial culture scenarios, their volume adjustment knobs often lack reliable limit locking structures. After adjustment, accidental touches caused by hand fatigue during continuous pipetting can easily lead to unintended rotation of the knob, causing the actual pipetting volume to deviate from the preset value. Since microbial culture has extremely high requirements for the accuracy of reagent concentration and bacterial inoculation amount, such deviations will directly affect the growth status of microorganisms and even lead to the distortion of experimental data. Utility Model Content

[0004] The purpose of this invention is to provide a manually adjustable pipette to solve the above problems. By engaging the limiting rod with different limiting grooves, the knob can be precisely fixed at different rotation angles, avoiding rotation caused by hand contact after adjustment and ensuring stable volume.

[0005] This utility model achieves the above-mentioned objective through the following technical solution: a manually adjustable pipette includes a handle, a knob rotatably connected to the handle, the knob being fixed by a limiting structure, the limiting structure including a limiting post, a limiting post being fixedly connected to the knob, the limiting post having multiple limiting grooves, the multiple limiting grooves being distributed in a circumferential array about the center of the knob, a push block being slidably connected to the handle, a limiting rod being fixedly connected to the push block, the limiting rod engaging with one of the limiting grooves.

[0006] Preferably, a guide plate is fixedly connected to the push block, and the guide plate is slidably connected to the handle.

[0007] Preferably, a guide shaft is fixedly connected to the grip, the guide plate is slidably connected to the guide shaft, and a first spring is fixedly connected between the guide plate and the grip.

[0008] Preferably, a suction head cone is threaded onto the grip, and a piston is slidably connected to the suction head cone.

[0009] Preferably, a push-off structure is provided between the grip and the suction head cone, the push-off structure including a push-out tube.

[0010] Preferably, a push tube is slidably connected to the conical suction head, and a connecting block is fixedly connected to the push tube.

[0011] Preferably, a push rod is slidably connected to the grip, and the connecting block and the push rod are detachably connected.

[0012] Preferably, a rotating shaft is rotatably connected to the push rod, and a stop block is fixedly connected to the rotating shaft, the stop block blocking and limiting the connection block.

[0013] Preferably, a rotating block is fixedly connected to the rotating shaft, and a torsion spring is fixedly connected between the rotating shaft and the push rod.

[0014] Preferably, a guide rod is fixedly connected to the push rod, the guide rod is slidably connected to the grip, and a second spring is fixedly connected between the push rod and the grip.

[0015] The beneficial effects of this utility model are as follows: A knob is rotatably connected to the handle, and the knob is fixed by a limiting structure. A limiting post is fixedly connected to the knob, and the limiting post is provided with multiple limiting grooves. The multiple limiting grooves are arranged in a circular array about the center of the knob. A push block is slidably connected to the handle, and a limiting rod is fixedly connected to the push block. The limiting rod engages with one of the limiting grooves. By engaging the limiting rod with different limiting grooves, the knob can be accurately fixed at different rotation angles, avoiding rotation caused by hand touch after adjustment, and ensuring stable range. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the connection structure between the suction head cone and the handle of this utility model.

[0018] Figure 3 for Figure 2 The diagram shown is an enlarged view of the structure of part A.

[0019] Figure 4 for Figure 2 The diagram shown is an enlarged view of the structure of section B.

[0020] Figure 5 for Figure 2 The diagram shows an enlarged view of section C.

[0021] In the diagram: 1. Handle; 2. Limiting structure; 201. Limiting post; 202. Limiting groove; 203. Limiting rod; 204. Push block; 205. Guide plate; 206. Guide shaft; 207. First spring; 3. Push-off structure; 301. Push-out tube; 302. Connecting block; 303. Push rod; 304. Rotating shaft; 305. Stop block; 306. Second spring; 307. Rotating block; 308. Torsion spring; 309. Guide rod; 4. Knob; 5. Suction head cone; 6. Piston. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figures 1-5 As shown, a manually adjustable pipette includes a handle 1, a knob 4 rotatably connected to the handle 1, and the knob 4 is fixed by a limiting structure 2. The limiting structure 2 includes a limiting post 201, the limiting post 201 is fixedly connected to the knob 4, the limiting post 201 is provided with multiple limiting grooves 202, the multiple limiting grooves 202 are distributed in a circular array about the center of the knob 4, a push block 204 is slidably connected to the handle 1, and a limiting rod 203 is fixedly connected to the push block 204. The limiting rod 203 engages with one of the limiting grooves 202.

[0024] As a technical optimization of this utility model, a guide plate 205 is fixedly connected to the push block 204, and the guide plate 205 is slidably connected to the handle 1. A guide shaft 206 is fixedly connected to the handle 1, and the guide plate 205 is slidably connected to the guide shaft 206. A first spring 207 is fixedly connected between the guide plate 205 and the handle 1. First, the operator holds the handle 1. If it is necessary to adjust the liquid volume, the push block 204 is pushed outward, which causes the guide plate 205 to slide along the handle 1 and the guide shaft 206. At this time, the first spring 207 is compressed, and the limiting rod 203 disengages from the limiting groove 202 of the limiting post 201, releasing the lock on the knob 4. Then, the knob is rotated. Knob 4 is used to adjust the liquid volume. By engaging the limiting rod 203 with different limiting grooves 202, the knob 4 can be precisely fixed at different rotation angles, preventing rotation caused by hand contact or workbench vibration after adjustment, and ensuring stable range. Then, rotate the knob 4 to the target scale, release the push block 204, the first spring 207 resets and pushes the guide plate 205 back, so that the limiting rod 203 engages with the corresponding limiting groove 202 to complete the locking. During this process, the guide shaft 206 provides a stable sliding trajectory for the guide plate, ensuring precise docking between the limiting rod and the limiting groove, and improving the reliability of adjustment. The handle 1 is threaded with a suction tip cone 5, and the suction tip cone 5 is slidably connected with a piston 6.

[0025] As a technical optimization of this utility model, a push-off structure 3 is provided between the handle 1 and the pipette tip cone 5. The push-off structure 3 includes a push-out tube 301, which is slidably connected to the pipette tip cone 5. A connecting block 302 is fixedly connected to the push-out tube 301. A push rod 303 is slidably connected to the handle 1. The connecting block 302 and the push rod 303 are detachably connected. A rotating shaft 304 is rotatably connected to the push rod 303. A stop block 305 is fixedly connected to the rotating shaft 304, which blocks and limits the connection block 302. A rotating block 307 is fixedly connected to the rotating shaft 304. A torsion spring 308 is fixedly connected between the rotating shaft 304 and the push rod 303. A guide rod 309 is fixedly connected to the push rod 303. After pipetting operation... Pressing the push rod 303 causes the guide rod 309 to slide along the handle 1, compressing the second spring 306. Simultaneously, the connecting block 302 and the ejector tube 301 slide along the pipette tip cone 5 via the rotating shaft 304 and the stop block 305. The guide rod 309 prevents the push rod from tilting, ensuring smooth piston movement and preventing air bubbles from being generated by shaking the microbial culture medium, which could affect the accuracy of pipetting. After pipetting, if it is necessary to remove the ejector tube 301, rotate the rotating block 307. The rotating block 307 drives the rotating shaft 304 to rotate, and the torsion spring 308 stores power. When the stop block 305 passes the connecting block 302, the ejector tube 301 can be removed through the connecting block 302. The guide rod 309 is slidably connected to the handle 1, and the second spring 306 is fixedly connected between the push rod 303 and the handle 1.

[0026] In use, the operator first holds the handle 1. To adjust the volume, push the push block 204 outwards, causing the guide plate 205 to slide along the handle 1 and guide shaft 206. At this time, the first spring 207 is compressed, and the limiting rod 203 disengages from the limiting groove 202 of the limiting post 201, releasing the lock on the knob 4. Then, rotate the knob 4 to adjust the volume. By engaging the limiting rod 203 with different limiting grooves 202, the knob 4 can be precisely fixed at different rotation angles, preventing rotation due to hand contact after adjustment and ensuring stable volume. Then, rotate the knob 4 to the target scale, release the push block 204, and the first spring 207 returns to its original position, pushing the guide plate 205 back, causing the limiting rod 203 to engage with the corresponding limiting groove 202 to complete the locking. During this process, the guide shaft 206 provides a stable sliding trajectory for the guide plate, ensuring precise engagement between the limiting rod and the limiting groove, improving adjustment reliability. Install the pipette tip. When pipetting, the pipette tip is fitted onto the pipette tip cone 5. The threaded connection between the pipette tip cone 5 and the handle 1 allows for easy replacement of different cone sizes according to culture needs, accommodating various pipette tip types. During pipetting, the piston 6 is driven to move by pressing the knob 4. The piston 6 completes aspiration or dissipation under air pressure. After the pipetting operation, the push rod 303 is pressed, causing the guide rod 309 to slide along the handle 1. The second spring 306 is compressed, and at the same time, the connecting block 302 and the ejector tube 301 are pushed to slide along the pipette tip cone 5 through the rotating shaft 304 and the stop block 305. The guide rod 309 can prevent the push rod from tilting, ensuring smooth piston movement and avoiding air bubbles generated by shaking of the microbial culture medium, which would affect the pipetting accuracy. After pipetting, if it is necessary to remove the ejector tube 301, the rotating block 307 is rotated. The rotating block 307 drives the rotating shaft 304 to rotate, and the torsion spring 308 stores force. When the stop block 305 passes the connecting block 302, the ejector tube 301 can be removed through the connecting block 302.

[0027] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0028] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A manually adjustable pipette, comprising a handle (1), characterized in that: A knob (4) is rotatably connected to the grip (1). The knob (4) is fixed by a limiting structure (2). The limiting structure (2) includes a limiting post (201). The limiting post (201) is fixedly connected to the knob (4). The limiting post (201) is provided with multiple limiting grooves (202). The multiple limiting grooves (202) are arranged in a circular array about the center of the knob (4). A push block (204) is slidably connected to the grip (1). A limiting rod (203) is fixedly connected to the push block (204). The limiting rod (203) engages with one of the limiting grooves (202).

2. The manually adjustable pipette according to claim 1, characterized in that: A guide plate (205) is fixedly connected to the push block (204), and the guide plate (205) is slidably connected to the handle (1).

3. A manually adjustable pipette according to claim 2, characterized in that: A guide shaft (206) is fixedly connected to the grip (1), the guide plate (205) is slidably connected to the guide shaft (206), and a first spring (207) is fixedly connected between the guide plate (205) and the grip (1).

4. A manually adjustable pipette according to claim 1, characterized in that: A suction cone (5) is threaded onto the grip (1), and a piston (6) is slidably connected onto the suction cone (5).

5. A manually adjustable pipette according to claim 4, characterized in that: A push-off structure (3) is provided between the grip (1) and the suction head cone (5), and the push-off structure (3) includes a push-out tube (301).

6. A manually adjustable pipette according to claim 5, characterized in that: The suction head cone (5) is slidably connected to an ejector tube (301), and a connecting block (302) is fixedly connected to the ejector tube (301).

7. A manually adjustable pipette according to claim 6, characterized in that: A push rod (303) is slidably connected to the grip (1), and the connecting block (302) is detachably connected to the push rod (303).

8. A manually adjustable pipette according to claim 7, characterized in that: A rotating shaft (304) is rotatably connected to the push rod (303), and a stop block (305) is fixedly connected to the rotating shaft (304). The stop block (305) blocks and limits the connection block (302).

9. A manually adjustable pipette according to claim 8, characterized in that: A rotating block (307) is fixedly connected to the rotating shaft (304), and a torsion spring (308) is fixedly connected between the rotating shaft (304) and the push rod (303).

10. A manually adjustable pipette according to claim 9, characterized in that: A guide rod (309) is fixedly connected to the push rod (303), the guide rod (309) is slidably connected to the grip (1), and a second spring (306) is fixedly connected between the push rod (303) and the grip (1).

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