Telescopic ejector pin
By designing the movable cavity and return spring structure in the telescopic thimble, the problem of welding fluid residue is solved, and better conductivity is achieved and service life is extended.
Patent Information
- Application Number
- CN202422097605.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-28
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-08-28
AI Technical Summary
During the welding process of the existing telescopic thimble, welding liquid is likely to remain in the gap between the telescopic part and the welded part, resulting in poor conductivity or adhesion, affecting service life.
A telescopic thimble is designed, including a welding part and a telescopic part. A movable cavity is provided in the telescopic part. The welding part enters the movable cavity through the connection port, and relative displacement is achieved using the movable cavity, and protected by a return spring and a limit stop to prevent welding liquid from entering the gap.
It effectively prevents welding liquid from remaining, and improves the conductivity and service life of the telescopic thimble.
Smart Images
Figure CN223156297U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of telescopic ejector pins, and particularly relates to a telescopic ejector pin. Background Art
[0002] The telescopic ejector pin, also known as an elastic pin, usually needs to be welded to a PCB board to form a connector. The existing telescopic ejector pin generally includes a welding part and a telescopic part provided at the upper end of the welding part. The welding part is used for welding with the PCB board, and the telescopic part is used for realizing electrical connection.
[0003] Usually, when welding the telescopic ejector pin, it is necessary to apply welding fluid to the telescopic ejector pin. Usually, a drop of welding fluid is dropped onto the upper end of the telescopic ejector pin to achieve the coating of the welding fluid on the telescopic ejector pin, so as to facilitate the subsequent welding of the telescopic ejector pin. Due to its structural characteristics, most of the existing telescopic ejector pins have the telescopic part provided at the upper end of the welding part, and in the top view state, the area of the telescopic part is smaller than the area of the welding part. Therefore, when dropping the welding fluid, the welding fluid will enter the gap remaining between the telescopic part and the welding part. When the welding is completed, there will still be a small amount of welding fluid remaining in the gap between the telescopic part and the welding part. When the PCB board after welding is powered on and used, the welding fluid will be electrolyzed, resulting in the telescopic part and the welding part being adhered through the electrolyzed welding fluid, causing the phenomenon that the telescopic part does not rebound, or problems such as the telescopic ejector pin not conducting electricity. Therefore, improvement is needed. Summary of the Utility Model
[0004] The main purpose of the utility model is to propose a telescopic ejector pin, aiming to provide a telescopic ejector pin that will not be interfered by welding fluid.
[0005] To achieve the above purpose, the utility model proposes a telescopic ejector pin, which includes a welding part and a telescopic part. An activity cavity is arranged inside the telescopic part. A connection port with a downward opening is provided at the lower end of the telescopic part, and the connection port is communicated with the activity cavity. The upper end of the welding part enters the activity cavity through the connection port, and the telescopic part and the welding part achieve relative displacement through the activity cavity.
[0006] Specifically, the telescopic part includes a probe body and a probe head. The probe head is arranged at the upper end of the probe body. The middle part of the probe body is hollow to form the activity cavity, and the connection port is arranged at the lower end of the probe body.
[0007] Specifically, the welding part includes a welding block, a guide block, and a connection block arranged in sequence from bottom to top. The welding block is used for welding with an external PCB board, the guide block is used for connecting the welding block and the connection block, and the connection block is located inside the activity cavity.
[0008] Specifically, an inclined surface is arranged at the upper end of the connection block.
[0009] Specifically, the upper surface of the guide block is connected to the lower surface of the connection block, the lower surface of the guide block is connected to the upper surface of the welding block, the area of the lower surface of the connection block is larger than the area of the upper surface of the guide block, the area of the upper surface of the guide block is equal to the area of the lower surface of the guide block, and the area of the lower surface of the guide block is larger than the area of the upper surface of the welding block.
[0010] Specifically, a return spring is arranged in the movable cavity. The upper end of the return spring abuts against the inner wall of the upper end of the movable cavity, and the lower end of the return spring abuts against one end of the welding part located in the movable cavity.
[0011] Specifically, both the telescopic part and the welding part are made of brass material, and the return spring is made of SUS304 material.
[0012] Specifically, limiting blocks are respectively arranged on both sides of the lower end of the probe body relative to the connection port.
[0013] In the technical solution of the present utility model, a connection port communicating with the movable cavity is arranged at the lower end of the telescopic part, and the upper end of the welding part enters the movable cavity through the connection port, thereby realizing the fitting connection between the telescopic part and the welding part. The connection part between the telescopic part and the welding part is protected from welding liquid through the movable cavity, thereby avoiding the influence of welding liquid on the movement or conductive effect of the telescopic thimble and improving the service life of the telescopic thimble. Description of the Drawings
[0014] Figure 1 It is a cross-sectional view of the present utility model.
[0015] Figure 2 It is a schematic assembly structure diagram of the present utility model.
[0016] The reference numerals include: 10, telescopic part; 11, probe body; 12, probe head; 13, movable cavity; 14, limiting block; 20, welding part; 21, welding block; 22, guide block; 23, connection block; 30, return spring. Specific Embodiments
[0017] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0018] It should be noted that if there are directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...) involved in the embodiments of the present utility model, then such directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a certain specific posture (as shown in the attached drawings). If this specific posture changes, then the directional indications will also change accordingly.
[0019] In addition, if there are descriptions involving "first" or "second", etc. in the embodiments of the present utility model, then such descriptions of "first" or "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.
[0020] As Figures 1 to 2 shown, a telescopic ejector pin includes a welding part and a telescopic part. An activity cavity is provided inside the telescopic part. A connection port is provided at the lower end of the telescopic part and is arranged with an opening facing downwards. The connection port is communicated with the activity cavity. The upper end of the welding part enters the activity cavity through the connection port. The telescopic part and the welding part achieve relative displacement through the activity cavity. By providing a connection port communicated with the activity cavity at the lower end of the telescopic part, the upper end of the welding part enters the activity cavity through the connection port, thereby realizing the fitting connection between the telescopic part and the welding part. When the telescopic ejector pin needs to be welded to the PCB board, the operator still drops the welding liquid from the upper end of the telescopic ejector pin. While retaining the traditional operation habit, the activity cavity also prevents the welding liquid from remaining in the gap between the welding part and the telescopic part, thereby avoiding the influence of the welding liquid on the activity or conductive effect of the telescopic ejector pin and improving the service life of the telescopic ejector pin.
[0021] The telescopic part includes a probe body and a probe head. The probe head is arranged at the upper end of the probe body. The middle part of the probe body is hollowed out to form an activity cavity. The connection port is arranged at the lower end of the probe body. In this embodiment, the middle part of the probe body is hollowed out to form an activity cavity, and a probe head is arranged at the upper end of the probe body, and electrical connection is achieved through the probe head.
[0022] The welding part includes a welding block, a guiding block, and a connecting block arranged in sequence from bottom to top. The welding block is used for welding with an external PCB board. The guiding block is used to connect the welding block and the connecting block. The connecting block is located in the movable cavity. In this embodiment, the welding block is welded to the PCB board, the guiding block connects the welding block and the connecting block, and the connecting block is located in the movable cavity. The guiding block guides the movable cavity, thereby facilitating the movement of the telescopic part in the vertical direction.
[0023] An inclined surface is provided at the upper end of the connecting block. In this embodiment, an inclined surface is provided at the upper end of the connecting block, thereby facilitating the improvement of the electrical conductivity efficiency between the return spring in the movable cavity, the telescopic part, and the welding part.
[0024] The upper surface of the guiding block is connected to the lower surface of the connecting block, the lower surface of the guiding block is connected to the upper surface of the welding block. The area of the lower surface of the connecting block is larger than the area of the upper surface of the guiding block. The area of the upper surface of the guiding block is equal to the area of the lower surface of the guiding block. The area of the lower surface of the guiding block is larger than the area of the upper surface of the welding block. In this embodiment, the cross-sectional views of the guiding block and the welding block are both rectangular, the cross-sectional view of the connecting block is trapezoidal with a right angle, and one side of the right-angle side of the connecting block is connected to the guiding block. At the same time, the volume of the connecting block is larger than the volume of the guiding block, and the volume of the guiding block is larger than the volume of the welding block, thereby forming a stepped shape with a decreasing level from top to bottom, thereby improving the drainage ability of the welding fluid and preventing the phenomenon of welding fluid backflow.
[0025] A return spring is arranged in the movable cavity. The upper end of the return spring abuts against the inner wall of the upper end of the movable cavity, and the lower end of the return spring abuts against one end of the welding part located in the movable cavity. In this embodiment, a return spring is arranged in the movable cavity. The return spring is connected to the telescopic part and the welding part respectively, thereby realizing compression and reset.
[0026] Both the telescopic part and the welding part are made of brass material, and the return spring is made of SUS304 material. In this embodiment, by making the telescopic part and the welding part of brass and making the return spring of SUS304 material, the electrical conductivity of the telescopic thimble is improved.
[0027] Limit stop blocks are respectively arranged on both sides of the lower end of the probe body relative to the connection port. In this embodiment, limit stop blocks are arranged at the connection port, and the connection block is limited by the limit stop blocks, thereby realizing the stable assembly of the telescopic part and the welding part.
[0028] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.
Claims
1. A telescopic ejector pin, comprising a welding part and a telescopic part, characterized in that: An active cavity is provided inside the telescopic part. At the lower end of the telescopic part, there is a connection port opening downward, and the connection port is communicated with the active cavity. The upper end of the welding part enters the active cavity through the connection port, and the telescopic part and the welding part achieve relative displacement through the active cavity.
2. The telescopic ejector pin according to claim 1, wherein: The telescopic part includes a probe body and a probe head. The probe head is arranged at the upper end of the probe body. The middle part of the probe body is hollow to form the active cavity, and the connection port is arranged at the lower end of the probe body.
3. The telescopic ejector pin according to claim 1, wherein: The welding part includes a welding block, a guide block and a connection block arranged in sequence from bottom to top. The welding block is used for welding with an external PCB board. The guide block is used for connecting the welding block and the connection block, and the connection block is located inside the active cavity.
4. The telescopic thimble according to claim 3, characterized in that: An inclined surface is arranged at the upper end of the connection block.
5. The telescopic thimble according to claim 3, wherein: The upper surface of the guide block is connected to the lower surface of the connection block, the lower surface of the guide block is connected to the upper surface of the welding block. The area of the lower surface of the connection block is larger than the area of the upper surface of the guide block. The area of the upper surface of the guide block is equal to the area of the lower surface of the guide block. The area of the lower surface of the guide block is larger than the area of the upper surface of the welding block.
6. The telescopic ejector pin according to claim 1, characterized in that: A return spring is arranged inside the active cavity. The upper end of the return spring abuts against the inner wall of the upper end of the active cavity, and the lower end of the return spring abuts against one end of the welding part located inside the active cavity.
7. A telescopic ejector pin according to claim 6, characterized in that: Both the telescopic part and the welding part are made of brass material, and the return spring is made of SUS304 material.
8. The telescopic thimble according to claim 2, characterized in that: At both sides of the lower end of the probe body relative to the connection port, limit blocks are respectively arranged.