CN203176118U - Double-layer screw - Google Patents
Double-layer screw Download PDFInfo
- Publication number
- CN203176118U CN203176118U CN 201320045090 CN201320045090U CN203176118U CN 203176118 U CN203176118 U CN 203176118U CN 201320045090 CN201320045090 CN 201320045090 CN 201320045090 U CN201320045090 U CN 201320045090U CN 203176118 U CN203176118 U CN 203176118U
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- CN
- China
- Prior art keywords
- screw
- inner bolt
- screw thread
- double
- head
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- 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 - Fee Related
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Abstract
The utility model relates to a fastening piece, in particular to a screw provided with an inner layer and an outer layer. The double-layer screw comprises an outer screw body and an inner screw body, wherein the outer screw body comprises a screw cap and a screw rod provided with a first thread, one end of the screw rod is connected with the screw cap in an integrated structure mode, the other end of the screw rod is a cone-shaped opening, a through hole used for placement of the inner screw body is formed in the center of the outer screw body, and the inner screw body and the outer screw body are connected in a rotatable mode. According to the technical scheme, the double-layer screw is simple in structure and reasonable in technique, the screw can be screwed more deeply due to the double-layer structure, and more labor can be saved when the screw is used. In addition, the larger the contact area between the thread of the screw and an object is, the larger the friction is and the better the fastening effect is, and the screw is firmer in use.
Description
Technical field
The utility model relates to a kind of fastening piece, relates in particular to a kind of screw, is specifically related to a kind of inside and outside two-layer screw that has.
Background technique
Screw is a kind of common for fastening hardware ﹠ tools, its terminal sharp-pointed as nail, and be threaded on the metallic rod.The using method of screw mainly contains two kinds, and one, will need fastening object or part to get tapped hole by the instrument electric drill of drill bit (as be threaded), undertaken fastening by drive screw again; Two, directly be screwed into by drive screw and carry out fastening to object or part.Wherein first method is mainly used in being fastenedly connected of metalwork, but this long-time use of Placement that matches with tapped hole by drive screw comes off easily; Second method is mainly used in materials such as timber and is fastenedly connected soft object, because when drive screw was screwed into object, the area of contact of object and drive screw was more big, then frictional force is more big, so the specification of drive screw is just shorter usually, so the fastening effect of screw has certain narrow limitation.
Summary of the invention
The utility model is at deficiency of the prior art, provide a kind of have inside and outside two-layer, the screw of fastening better effects if.
In order to solve the problems of the technologies described above, the utility model is solved by following technical proposals:
A kind of double-deck screw, comprise male screw thread and inner bolt, described male screw thread comprises the head of a nail and is provided with the screw rod of first screw thread, screw rod one end is integrative-structure with the head of a nail and is connected, the screw rod the other end is tapered mouthful, described male screw thread center is provided with for the through hole of placing male screw thread, and described inner bolt and male screw thread are rotatably connected.
As preferably, described through hole is tapped through hole, and the outer surface of described inner bolt is provided with second screw thread, and inner bolt matches with through hole by second screw thread and is rotatably connected with male screw thread.
As preferably, an end of described head of a nail upper surface and inner bolt is equipped with a word groove.
As preferably, an end of described head of a nail upper surface and inner bolt is equipped with cross recess.
As preferably, the other end of described inner bolt is provided with the pointed cone head that is integrative-structure with inner bolt, pointed cone head and pass tapered mouthful.
According to the technical solution of the utility model, simple in structure, technology is reasonable, and by structure of two layers, screw can be screwed into more to be deepened, and uses more laborsaving; Yet screw screw thread and object area of contact are bigger, and frictional force is bigger, and fastening better effects if is used more firm.
Description of drawings
Fig. 1 is the double-deck screw embodiment's of the utility model sectional drawing.
Fig. 2 is the structural representation of male screw thread among Fig. 1.
Reference character: 1, male screw thread, 2, the head of a nail, 3, screw rod, 4, groove, 5, tapered mouthful, 6, through hole, 7, inner bolt, 8, the pointed cone head.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail:
As depicted in figs. 1 and 2, structure of the present utility model is made up of male screw thread 1 and inner bolt 7 as can be known.
Wherein male screw thread 1 comprises the head of a nail 2 and screw rod 3, and the center of male screw thread 1 is provided with through hole 6 and passes the head of a nail 1 and screw rod 3.One end of screw rod 3 is fixedlyed connected with the head of a nail 2 and is integrative-structure, and the other end of screw rod 3 is provided with one tapered mouthful 5, and this tapered mouthful 5 is passed screw rod 3 for through hole 6, in the openings of the other end of screw rod 3.
By Fig. 1 and Fig. 2 as can be known, the outer surface of screw rod 3 is provided with first screw thread; Male screw thread 1 center is provided with through hole 6, and this through hole 6 is tapped through hole; The outer surface of inner bolt 7 is provided with second screw thread.Second screw thread matches with tapped through hole, makes inner bolt 7 be rotatably connected with male screw thread 1 in through hole 6.
Or the head of a nail 2 is equipped with a word groove 4 cross recess 4 with the upper end of inner bolt 7, and wherein the groove 4 on the head of a nail 2 and the inner bolt 7 can be used, and also can use separately.The other end of inner bolt 7 is provided with pointed cone head 8, and when the upper surface flush of the upper surface of the head of a nail 2 and inner bolt 7, pointed cone head 8 passes male screw thread 1, by sectional view Fig. 1 as can be known, the hypotenuse in pointed cone head 8 and tapered mouthful of 5 cross sections on same straight line horizontal by same angle.
Usually we can think that screw and object frictional force need bigger, then only need to increase the length of lead screw in order to make screw reach better firm effect, screw is screwed into more dark, the frictional force of screw and object is more big, continues to be screwed into more difficult, uses very effort.
In the technical solution of the utility model, by instrument male screw thread and inner bolt are screwed in the object together, prop up and can not continue to be screwed into up to the outer surface of the head of a nail and object; Then inner bolt is continued to be screwed into, because inner bolt is few with the object area of contact when being screwed into, resistance is less when being screwed into, be screwed into more laborsaving, but the area of contact increase of screw and object is on the whole used more firm.It should be noted that during use that when being screwed into inner bolt, inner bolt and male screw thread can not break away from mutually, inner bolt and male screw thread break away from, and then inner bolt has lost its due effect.
In a word, the above only is preferred embodiment of the present utility model, and all equalizations of doing according to the utility model claim change and modify, and all should belong to the covering scope of the utility model patent.
Claims (5)
1. double-deck screw, it is characterized in that: comprise male screw thread (1) and inner bolt (7), described male screw thread (1) comprises the head of a nail (2) and is provided with the screw rod (3) of first screw thread, screw rod (3) one ends are integrative-structure with the head of a nail (2) and are connected, screw rod (3) the other end is tapered mouthful (5), described male screw thread (1) center is provided with for the through hole (6) of placing inner bolt (7), and described inner bolt (7) is rotatably connected with male screw thread (1).
2. double-deck screw according to claim 1, it is characterized in that: described through hole (6) is tapped through hole, the outer surface of described inner bolt (7) is provided with second screw thread, and inner bolt (7) matches with through hole (6) by second screw thread and is rotatably connected with male screw thread (1).
3. double-deck screw according to claim 2, it is characterized in that: an end of the described head of a nail (2) upper surface and inner bolt (7) is equipped with the groove (4) that is a word.
4. double-deck screw according to claim 2, it is characterized in that: an end of the described head of a nail (2) upper surface and inner bolt (7) is equipped with the groove (4) that is cross.
5. according to any described double-deck screw of claim 1 to 4, it is characterized in that: the other end of described inner bolt (7) is provided with the pointed cone head (8) that is integrative-structure with inner bolt (7), pointed cone head (8) and pass tapered mouthful (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320045090 CN203176118U (en) | 2013-01-28 | 2013-01-28 | Double-layer screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320045090 CN203176118U (en) | 2013-01-28 | 2013-01-28 | Double-layer screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203176118U true CN203176118U (en) | 2013-09-04 |
Family
ID=49072820
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320045090 Expired - Fee Related CN203176118U (en) | 2013-01-28 | 2013-01-28 | Double-layer screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203176118U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108425926A (en) * | 2018-05-07 | 2018-08-21 | 海盐县宏诚标准件有限公司 | A kind of anti-corrosion screw |
-
2013
- 2013-01-28 CN CN 201320045090 patent/CN203176118U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108425926A (en) * | 2018-05-07 | 2018-08-21 | 海盐县宏诚标准件有限公司 | A kind of anti-corrosion screw |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130904 Termination date: 20150128 |
|
| EXPY | Termination of patent right or utility model |