CN202560763U - Surface-mounted fastener - Google Patents
Surface-mounted fastener Download PDFInfo
- Publication number
- CN202560763U CN202560763U CN2012201376704U CN201220137670U CN202560763U CN 202560763 U CN202560763 U CN 202560763U CN 2012201376704 U CN2012201376704 U CN 2012201376704U CN 201220137670 U CN201220137670 U CN 201220137670U CN 202560763 U CN202560763 U CN 202560763U
- Authority
- CN
- China
- Prior art keywords
- nut body
- welding portion
- fastening piece
- tapped hole
- surface mount
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Abstract
The utility model relates to the field of PCB manufacturing, and in particular to a fastener surface-mounted through a reflow oven. The surface-mounted fastener comprises a hollow cylindrical nut body and a welding part connected to one end of the nut body, wherein the inside of the nut body is provided with a threaded hole, the inside of the welding part is provided with a counter bore communicated with the threaded hole, and the inner diameter of the counter bore is larger than that of the threaded hole. Thus, excess soldering tin will retain in the counter bore instead of flowing into the threaded hole to cause poor threads when the welding part is inserted in a hole of a PCB board for welding.
Description
Technical field
The utility model relates to PCB and makes the field, relates in particular to a kind ofly to carry out surface-pasted fastening piece through reflow furnace.
Background technique
At present at PCB (printed circuit board; English full name: Printed Circuit Board) go up the fastening function that realizes screw thread; Used the fastening piece of a large amount of electroplating surfaces with tin, its assembly process is that the Fastener products surface is sticked wheat and drawn; Pre-install then in packaging tray; The client uses vacuum slot to grasp product and (Charge Coupled Device, English full name: Charge-coupled Device) locate in the hole that is placed on the pcb board that scribbles solder(ing) paste, the processing procedure through reflow furnace carries out welded and installed then through CCD.
The structure of existing surface mount fastening piece is as shown in Figure 1, comprise hollow cylindrical nut body 1, be connected to the welding portion 2 of said nut body 1 one ends, said nut body 1 and said welding portion 2 inside are equipped with the tapped hole 3 of perforation.
In the practical set process, because the inhomogeneous grade that solder(ing) paste is coated with can not be corrected, when welding, scolding tin causes screw thread bad owing to the capillary inwall that acts on the said welding portion 2 in edge gathers in the tapped hole 3.
Therefore, how a kind of surface mount fastening piece that scolding tin flows in the tapped hole can avoid welding the time being provided is the technical problem that those skilled in the art need to be resolved hurrily.
The model utility content
The purpose of the utility model is to provide a kind of surface mount fastening piece, and scolding tin flows into the problem of tapped hole when welding to solve existing surface mount fastening piece.
For solving the problems of the technologies described above; The utility model provides a kind of surface mount fastening piece; Comprise hollow cylindrical the nut body, be connected to the welding portion of said nut body one end; The inside of said nut body is provided with tapped hole, and the inside of said welding portion is provided with the counterbore that is communicated with said tapped hole, and the internal diameter of said counterbore is greater than the internal diameter of said tapped hole.
Preferably, the external diameter of said welding portion is less than the external diameter of said nut body.
Preferably, the outer surface of the outer surface of said nut body and said welding portion is coated with metal layer respectively.
Preferably, the outer surface of the outer surface of said nut body and said welding portion is coated with the tin layer respectively.
The surface mount fastening piece that the utility model provides; Comprise hollow cylindrical the nut body, be connected to the welding portion of said nut body one end; The inside of said nut body is provided with tapped hole; The inside of said welding portion is provided with the counterbore that is communicated with said tapped hole, and the internal diameter of said counterbore is greater than the internal diameter of said tapped hole.Like this, said welding portion is inserted when welding in the hole on the pcb board, unnecessary scolding tin can be stayed in the said counterbore, prevents that scolding tin from flowing in the said tapped hole, causes screw thread bad.
Description of drawings
Fig. 1 is the structural representation of existing surface mount fastening piece;
Fig. 2 is the structural representation of the utility model one embodiment's surface mount fastening piece.
Embodiment
For above-mentioned purpose, the feature and advantage that make the utility model can be more obviously understandable, the embodiment of the utility model is done detailed explanation below in conjunction with accompanying drawing.
The surface mount fastening piece that the utility model provides; As shown in Figure 2; Comprise hollow cylindrical nut body 11, be connected to the welding portion 12 of said nut body 11 1 ends; The inside of said nut body 11 is provided with tapped hole 13, and the inside of said welding portion 12 is provided with the counterbore 14 that is communicated with said tapped hole 13, and the internal diameter of said counterbore 14 is greater than the internal diameter of said tapped hole 13.When welding in the hole that said welding portion 12 inserts on the pcb board; Unnecessary scolding tin can be stayed in the said counterbore 14; Thereby, can avoid scolding tin to flow in the said tapped hole 13 and cause screw thread bad, guarantee that the surface mount fastening piece has good fastening performance.
Preferably, as shown in Figure 2, the external diameter of said welding portion 12 is less than the external diameter of said body 11.Location when making things convenient for the surface mount fastening piece to insert in the hole of pcb board can not goed deep into long.
Preferably; The outer surface of the outer surface of said nut body 11 and said welding portion 12 is coated with metal layer respectively; Preferably, said metal layer is selected the tin layer for use, utilizes the characteristics that the tin quality is softer, fusing point is lower, plasticity is strong; Help in the welding process with the hole that is coated in said pcb board in solder(ing) paste merge, play the effect of fixing said surface mount fastening piece.
In sum; The surface mount fastening piece that the utility model provides; Comprise hollow cylindrical nut body 11, be connected to the welding portion 12 of said nut body 11 1 ends; The inside of said nut body 11 is provided with tapped hole 13, and the inside of said welding portion 12 is provided with the counterbore 14 that is communicated with said tapped hole 13, and the internal diameter of said counterbore 14 is greater than the internal diameter of said tapped hole 13.Like this, when welding in the hole that said welding portion 12 is inserted on the pcb boards, unnecessary scolding tin can be stayed in the said counterbore 14, prevents that scolding tin from flowing in the said tapped hole 13, causes screw thread bad.
Obviously, those skilled in the art can carry out various changes and modification to the utility model and not break away from the spirit and the scope of the utility model.Like this, belong within the scope of the utility model claim and equivalent technologies thereof if these of the utility model are revised with modification, then the utility model also is intended to comprise these changes and modification interior.
Claims (4)
1. surface mount fastening piece; Comprise hollow cylindrical the nut body, be connected to the welding portion of said nut body one end; The inside of said nut body is provided with tapped hole; It is characterized in that the inside of said welding portion is provided with the counterbore that is communicated with said tapped hole, the internal diameter of said counterbore is greater than the internal diameter of said tapped hole.
2. surface mount fastening piece as claimed in claim 1 is characterized in that the external diameter of said welding portion is less than the external diameter of said nut body.
3. according to claim 1 or claim 2 surface mount fastening piece is characterized in that the outer surface of said nut body and the outer surface of said welding portion are coated with metal layer respectively.
4. surface mount fastening piece as claimed in claim 3 is characterized in that, the outer surface of said nut body and the outer surface of said welding portion are coated with the tin layer respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201376704U CN202560763U (en) | 2012-04-01 | 2012-04-01 | Surface-mounted fastener |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201376704U CN202560763U (en) | 2012-04-01 | 2012-04-01 | Surface-mounted fastener |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202560763U true CN202560763U (en) | 2012-11-28 |
Family
ID=47210423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201376704U Expired - Lifetime CN202560763U (en) | 2012-04-01 | 2012-04-01 | Surface-mounted fastener |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202560763U (en) |
-
2012
- 2012-04-01 CN CN2012201376704U patent/CN202560763U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121128 |
|
| CX01 | Expiry of patent term |