Elastic needle

Abstract

The application provides an elastic needle which is used in cooperation with a base, the elastic needle is assembled in a mounting hole of the base, the elastic needle comprises a needle tube, a plurality of split grooves are formed in the tube wall of the needle tube along the axial direction, the split grooves divide the tube wall of the corresponding area into a plurality of elastic arms which can produce radial elastic deformation, when the needle tube is assembled in the base mounting hole, the tube wall is in elastic contact with the inner wall of the base mounting hole through the radial elastic deformation of the elastic arms. The elastic needle of the application, the needle tube is in elastic contact with the inner wall of the base mounting hole through the elastic arms, so that the insertion and extraction force of the elastic needle in the mounting hole is increased, and the elastic needle is prevented from being loosened or popped out from the mounting hole in harsh working conditions such as vibration. Meanwhile, the split grooves are designed to make the tail part of the needle tube have radial deformation capacity, and prevent the insertion and extraction force from being too large.

Description

Technical Field

[0001] This invention relates to the field of electrical connector technology, and more particularly to an elastic pin. Background Technology

[0002] The description in this section provides only background information related to the disclosure of this invention and does not constitute prior art.

[0003] As electronic devices become increasingly miniaturized and modular, Pogo Pins, as important electrical connection components, are widely used in areas such as module mating. A Pogo Pin typically consists of a tube, a needle tip, and a built-in spring. The tube needs to be fixed within the mounting hole of the base.

[0004] like Figure 11 As shown, this is a type of elastic needle 100' in the prior art, where the needle tube has neither a raised ring nor a slotted design. For example... Figure 12 As shown, when the elastic pin 100' is installed in the mounting hole 2 of the base 1, the elastic pin only relies on the cooperation between the tail pin and the slotted insertion hole to provide the holding force. The holding force of the elastic pin in the mounting hole of the base is small, and the connection reliability and anti-detachment ability are weak.

[0005] To address the aforementioned problems in the prior art, this application provides an elastic needle structure with greater retaining force.

[0006] It should be noted that the above description of the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of the present invention and facilitating understanding by those skilled in the art. It should not be assumed that the above technical solutions are known to those skilled in the art simply because they have been described in the background section of this invention. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide an elastic needle.

[0008] To solve the above-mentioned technical problems, an elastic needle is provided for use with a base. The elastic needle is assembled in the mounting hole of the base. The elastic needle includes a needle tube, and the tube wall is provided with multiple slots along the axial direction. The multiple slots divide the tube wall in the corresponding area into multiple elastic arms that can generate radial elastic deformation. When the needle tube is assembled in the mounting hole of the base, the tube wall elastically contacts the inner wall of the mounting hole of the base through the radial elastic deformation of the elastic arms.

[0009] Preferably, the tube wall of the needle is provided with a circumferential protrusion, and the protrusion is axially penetrated by the slot and divided into multiple segments.

[0010] Preferably, the convex ring is located at the tail end of the needle tube, and the cleavage starts from the tail end face of the needle tube, extends axially and completely penetrates the convex ring, dividing the convex ring into a plurality of elastic arms.

[0011] Preferably, the convex ring is located between the tail end and the middle of the needle tube, the slot penetrates the convex ring axially, and the tail end of the slot extends to the tail end face of the needle tube.

[0012] Preferably, the slot extends through the convex ring in the axial direction, and the two ends of the slot in the axial direction are closed.

[0013] Preferably, the elastic needle further includes: a needle tip slidably inserted into the head of the needle tube; a tail pin inserted into and fixed to the tail end of the needle tube; a spring disposed inside the needle tube; and a ball bearing disposed between the spring and the needle tip. One end of the spring abuts against the tail pin, and the other end abuts against the ball bearing, and applies an elastic force to the needle tip through the ball bearing. When the needle tip is compressed by an external force, it can retract into the needle tube and compress the spring. When the external force is removed, the elastic force of the spring drives the needle tip to reset through the ball bearing.

[0014] Preferably, the inner wall of the needle tube near the tail end is recessed inward to form a plurality of circumferentially arranged concave points, or a concave ring one is provided circumferentially, and the outer wall of the tail nail is provided with a concave ring two. The concave points or concave ring one are used to cooperate with the concave ring two to fix the tail nail inside the needle tube.

[0015] Preferably, a socket terminal is provided at the bottom of the mounting hole, and the tail end of the tail pin is clamped by the socket terminal to achieve electrical connection.

[0016] Preferably, the number of the slots is 2-3, and the elastic arms are evenly distributed along the circumference of the needle tube.

[0017] By employing the above technical solutions, the beneficial effects of the present invention are as follows: The elastic needle of this application has a needle tube that forms elastic contact with the inner wall of the mounting hole of the base through an elastic arm, thereby increasing the insertion and extraction force of the elastic needle in the mounting hole and preventing it from loosening or popping out of the mounting hole under harsh working conditions such as vibration. In addition, because the elastic needle of this application has a groove on the needle tube, the convex ring portion has better elastic deformation space when compressed. This design avoids strong interference between the convex ring and the mounting hole of the base, and provides a smoother insertion and extraction force during insertion or extraction, preventing problems such as installation or disassembly difficulties caused by excessive insertion and extraction force. Attached Figure Description

[0018] Figure 1 This is a cross-sectional structural diagram of the pogo syringe according to Embodiment 1 of this application.

[0019] Figure 2 This is a cross-sectional structural diagram of the pogo syringe according to Embodiment 1 of this application.

[0020] Figure 3 This is a cross-sectional structural diagram of the pogo syringe according to Embodiment 2 of this application.

[0021] Figure 4 This is a cross-sectional structural diagram of the pogo syringe according to Embodiment 3 of this application.

[0022] Figure 5 This is a cross-sectional structural diagram of the pogo syringe according to Embodiment 3 of this application.

[0023] Figure 6 This is a schematic diagram of the elastic needle of this application.

[0024] Figure 7 This is a schematic diagram of the exploded structure of the elastic needle of this application.

[0025] Figure 8 This is a cross-sectional structural diagram of the elastic needle of this application when it is installed on the base.

[0026] Figure 9 yes Figure 8 A magnified view of a portion of the image.

[0027] Figure 10 This is a schematic diagram of the elastic needle in Comparative Example 1.

[0028] Figure 11 This is a schematic diagram of the elastic needle in Comparative Example 2.

[0029] Figure 12 This is a cross-sectional structural diagram of the elastic needle in Comparative Example 2 when it is installed on the base.

[0030] Figure 13 This is a diagram showing the insertion and extraction force-displacement curve of the elastic needle in the mounting hole of the base according to Embodiment 1 of this application.

[0031] Figure 14 This is a diagram showing the insertion and extraction force-displacement curve of the elastic needle in the mounting hole of the base, as shown in Comparative Example 2.

[0032] Figure 15 This is a diagram showing the insertion and extraction force-displacement curve of the elastic needle in the mounting hole of the base, as shown in Comparative Example 1.

[0033] Wherein: 1. Base; 2. Mounting hole; 3. Needle tube; 4. Raised ring; 5. Groove; 6. Concave point; 7. Concave ring one; 8. Spring; 30. Ball; 100. Elastic needle of this application; 100'. Elastic needle of comparative example; 3'. Needle tube of comparative example; 10. Tail pin; 20. Needle tip; 11. Concave ring two. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] It should be noted that in the description of this invention, the terms "first," "second," etc., are used only for descriptive purposes and to distinguish similar objects; there is no order between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0036] like Figure 1-9 As shown, this invention discloses an elastic needle used in conjunction with a base. The elastic needle is assembled within a mounting hole of the base. The elastic needle includes a needle tube, the wall of which has multiple axially oriented grooves. These grooves divide the wall into multiple elastic arms capable of radial elastic deformation. When the needle tube is assembled within the mounting hole of the base, the wall of the tube elastically contacts the inner wall of the mounting hole through the radial elastic deformation of the elastic arms. A circumferentially oriented protruding ring is provided on the wall of the needle tube. This protruding ring is axially penetrated by the grooves and divided into multiple segments, each segment located on one of the elastic arms. The elastic needle of this application, by forming elastic contact between the needle tube and the inner wall of the mounting hole through the elastic arms, increases the insertion and extraction force of the elastic needle within the mounting hole, preventing it from loosening or popping out under harsh conditions such as vibration. Simultaneously, the groove design provides radial deformation capability at the tail end of the needle tube, preventing excessive insertion and extraction force.

[0037] Example 1

[0038] like Figure 1 and 2 As shown, the convex ring is located between the tail end and the middle of the needle tube. The slot 5 penetrates the convex ring 4 axially, and the two ends of the slot 5 are closed structures located on the wall of the needle tube 3. There are two or more slots 5. When the needle tube 3 is pressed into the base mounting hole 2, the hole wall of the base mounting hole 2 squeezes the convex ring 4, forcing each elastic arm to produce radially inward elastic contraction. Thus, relying on its outward rebound force, it forms an elastic compression with the side wall of the mounting hole, thereby increasing the insertion and extraction force of the elastic needle in the mounting hole.

[0039] Since the groove 5 does not extend to either end face of the needle tube 3, the front and rear ends of the needle tube 3 are complete structures, which makes the needle tube 3 have higher bending and torsional stiffness, making it suitable for occasions with high requirements for installation accuracy and structural strength.

[0040] Example 2

[0041] like Figure 3 As shown, the convex ring 4 is disposed at the tail end of the needle tube 3, constituting the terminal of the needle tube 3. The slot 5 starts from the tail end face of the convex ring 4, extends axially and completely penetrates the convex ring 4, dividing the convex ring 4 into multiple elastic arms. In a preferred embodiment, there are four slots 5, evenly distributed circumferentially along the wall of the needle tube 3, dividing the tail end of the needle tube 3 into multiple circumferentially evenly distributed elastic claws. Each elastic claw resembles a cantilever beam, with its root connected to the main body of the needle tube 3, and its free end can freely deflect radially. During assembly, the multiple elastic claws at the tail end can produce large and smooth elastic deformation when compressed, facilitating installation. The inner wall of the needle tube near the tail end is recessed inward to form multiple circumferentially arranged concave points. These concave points are usually formed by stamping or other methods. These concave points are used to cooperate with the concave ring on the tail pin to fix the tail pin inside the needle tube and provide a certain circumferential anti-rotation function.

[0042] Example 3

[0043] like Figure 4 and 5 As shown, multiple slots 5 penetrate the convex ring 4 axially, and the tails of the slots extend to the tail end face of the needle tube. This makes the axial length of the slots 5 significantly greater than the axial dimension of the convex ring 4. This design allows the slots 5 to divide a large section of the tube wall from the convex ring 4 to the tail end face into multiple circumferentially extending, elongated elastic arms. This long cantilever beam structure makes the elastic arms more flexible and has a greater elastic stroke. The inner wall of the needle tube near the tail end is recessed inward to form a circumferentially arranged concave ring 1, which is used to cooperate with a concave ring 2 on the tail pin to fix the tail pin inside the needle tube.

[0044] like Figure 6 and 7 As shown, the elastic needle also includes a needle tip that is slidably inserted into the head of the needle tube; a tail pin that is inserted into and fixed to the tail end of the needle tube; a spring disposed inside the needle tube, with its two ends respectively abutting against the tail pin and the needle tip; and a ball bearing disposed between the spring and the needle tip. When the needle tip is compressed by an external force, it can retract into the needle tube and compress the spring. When the external force is removed, the elastic force of the spring can drive the needle tip to return to its original position.

[0045] like Figure 8 and9 As shown, in Embodiment 1, the elastic pin is installed in the mounting hole of the base. A socket terminal is provided at the bottom of the mounting hole, and the tail end of the pin is held by the socket terminal to achieve electrical connection. Figure 13 The diagram shows the insertion and extraction force-displacement curve of the elastic needle in the mounting hole of the base in Embodiment 1, illustrating the variation of the insertion and extraction force during insertion and extraction. The diameter of the mounting hole is 1.35 mm. In the initial insertion stage, the convex hull of the elastic needle contacts the inner wall of the mounting hole, and the elastic arm undergoes elastic deformation. The insertion force increases with displacement, reaching a peak of approximately 6.7 N. During the stable insertion stage: after the peak, a stable state is reached. The insertion force decreases slightly and then stabilizes at around 4.1 N. During the extraction stage (when the displacement is reversed): when the elastic needle is pulled out of the mounting hole, the direction of the force becomes negative, and the extraction force stabilizes at 4.1 N, forming a smooth negative plateau segment until the elastic needle leaves the mounting hole. In this embodiment, the maximum insertion force (MF) is 6.7 N, and the maximum extraction force (uMF) is 4.1 N. The insertion and extraction forces are stable.

[0046] like Figure 14 As shown, Figure 11 and Figure 12 The mechanical characteristic curve of the flexible pin. This flexible pin relies solely on the engagement between the tail pin and the slotted insertion hole to provide holding force. The dimensions of the flexible pin and the base mounting hole in this comparative example are consistent with those in Example 2. Insertion stage: In the initial stage of insertion, the pogo pin tail pin opens the slotted flexible insertion hole, and the insertion force increases rapidly. As the tail pin continues to be inserted, the insertion force decreases slightly before reaching a stable state. Pull-out stage: The pull-out force remains stable until the tail pin disengages from the slotted flexible insertion hole. At this point, the pressure exerted by the spring wall on the tail pin rapidly decreases to 0, and the rapidly contracting spring wall exerts a forward pushing force on the tail pin. In this comparative example, the flexible pin relies solely on the engagement between the tail pin and the slotted insertion hole to provide holding force. The insertion force is only 1.16N and the pull-out force is only 0.61N. Both insertion and pull-out force values ​​are relatively low. Therefore, the holding force of the flexible pin in the base mounting hole is small, resulting in weak connection reliability and resistance to detachment.

[0047] like Figure 15 As shown, Figure 10 The diagram shows the insertion and extraction force-displacement curve when the elastic pin is inserted into the mounting hole of the base. This elastic pin is... Figure 11The structure shown is based on a raised bulge but without a slot, with all other dimensions remaining the same. The insertion and extraction force is provided by the interference fit between the raised bulge and the base mounting hole. Insertion phase: Initially, the inner wall of the base mounting hole causes elastic deformation of the raised bulge structure. The insertion force rapidly increases to its maximum peak value with displacement. After the peak, the raised bulge structure enters a stable interference state throughout the entire process, and the insertion force stabilizes after a slight decrease. Extraction phase: The extraction force remains stable until it rapidly drops to zero after the raised bulge leaves the socket's inner hole. Insertion phase: Within a displacement range of approximately 3.5~7.0mm, the stable insertion force (approximately 39.6N) plateau exhibits high-frequency, small-amplitude fluctuations. Extraction phase: Within a displacement range of approximately 4.5~7.0mm, the stable extraction force (approximately 33.4N) plateau also exhibits sawtooth-shaped force fluctuations. The unslotted raised bulge structure has limited elastic deformation space, forming a strong interference fit with the base mounting hole, which causes force fluctuations during insertion and extraction. In addition, the insertion and extraction forces in this comparison are too high (insertion force 39.6N, extraction force 33.4N). Although the holding force is strong, it is easy to cause difficulties in installation or disassembly and to damage the product structure.

[0048] At the same time, in comparison Figure 13 In the process of inserting and removing the elastic pin, the elastic pin has a structure with a groove and a convex hull, which makes the insertion and removal force curve smoother. The groove design can release elastic space, improve contact uniformity, avoid force fluctuations caused by strong interference, and control the insertion and removal force within a more reasonable range.

[0049] The above-described embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention. The scope of protection of the present invention is defined by the claims.

Claims

1. An elastic needle, used in conjunction with a base, wherein the elastic needle is fitted into a mounting hole in the base, characterized in that, The elastic needle includes a needle tube, the wall of which has multiple cleavages along the axial direction. The multiple slots divide the pipe wall in the corresponding region into multiple elastic arms capable of radial elastic deformation. When the needle tube is assembled into the mounting hole of the base, the tube wall makes elastic contact with the inner wall of the mounting hole of the base through the radial elastic deformation of the elastic arm.

2. The resilient needle of claim 1, wherein, The tube wall of the needle is provided with a circumferential protrusion, and the protrusion is axially penetrated by the slot and divided into multiple segments.

3. The elastic needle according to claim 2, characterized in that, The convex ring is located at the tail end of the needle tube, and the groove starts from the tail end face of the needle tube, extends axially and completely penetrates the convex ring, dividing the convex ring into multiple elastic arms.

4. The elastic needle according to claim 2, characterized in that, The convex ring is located between the tail end and the middle of the needle tube, the groove passes through the convex ring axially, and the tail end of the groove extends to the tail end face of the needle tube.

5. The elastic needle according to claim 2, characterized in that, The slot extends through the convex ring in the axial direction, and the two ends of the slot in the axial direction are closed.

6. The elastic needle according to claim 2, characterized in that, It also includes, A needle that can be slidably inserted into the head of the syringe; A tail pin is inserted into and fixed to the tail end of the needle tube; A spring is disposed inside the needle tube; A ball bearing is disposed between the spring and the needle. One end of the spring abuts against the tail pin, and the other end abuts against the ball bearing, thereby applying an elastic force to the needle through the ball bearing. When the needle is pressed by an external force, it can retract into the needle tube and compress the spring. When the external force is removed, the elastic force of the spring drives the needle to reset through the ball bearing.

7. The elastic needle according to claim 6, characterized in that, The inner wall of the needle tube near the tail end is recessed inward to form multiple circumferentially arranged concave points, or a concave ring one is provided circumferentially. The outer wall of the tail nail is provided with a concave ring two. The concave points or concave ring one are used to cooperate with the concave ring two to fix the tail nail inside the needle tube.

8. The elastic needle according to claim 2, characterized in that, The bottom of the mounting hole is provided with a socket terminal, and the tail end of the tail pin is clamped by the socket terminal to achieve electrical connection.

9. The elastic needle according to claim 2, characterized in that, The number of grooves is 2-3, and the elastic arms are evenly distributed along the circumference of the needle tube.

Images