CN202545498U - Self-tapping screw - Google Patents
Self-tapping screw Download PDFInfo
- Publication number
- CN202545498U CN202545498U CN 201220021315 CN201220021315U CN202545498U CN 202545498 U CN202545498 U CN 202545498U CN 201220021315 CN201220021315 CN 201220021315 CN 201220021315 U CN201220021315 U CN 201220021315U CN 202545498 U CN202545498 U CN 202545498U
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- screw
- thread
- screw thread
- tapping
- screw rod
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Abstract
The utility model discloses a self-tapping screw, which comprises a screw head and a screw rod connected with the screw head, wherein a first thread and a second thread are axially distributed at equal distance on the screw rod; the height of thread form of the first thread is higher than that of the thread form of the second thread; and the angle of thread form of the first thread is smaller than that of the thread form of the second thread. According to the self-tapping screw provided by the utility model, the contact area between the thread of the screw rod and soft materials such as plastic parts is increased, so the fastening and bonding force of the screw rod and the plastic parts is improved effectively.
Description
Technical field
The utility model relates to a kind of fastening screw trip bolt, particularly a kind of tapping screw.
Background technique
Common tapping screw generally includes screw head, and the screw rod that links to each other with screw head has Thread Forming TF on the screw rod, the connection between the sheet metal that common tapping screw is used for approaching more (steel plate, saw plate etc.).During connection, earlier connected piece is made thread Pilot hole, again tapping screw is screwed in the thread Pilot hole of connected piece.Since the thread surface of tapping screw have higher hardness (usually >=450HV0.3), can be in the thread Pilot hole of connected piece the tapping internal thread, connect thereby form.
But for being connected of softwood matter (like plastic basis material or timber) component, fastening effect was undesirable after above-mentioned common tapping screw was screwed into the plastics body, screw is very easy to thread off.
Summary of the invention
The inventor of the utility model finds through practical studies; In actual conditions; The tapping screw that is used for fastening softwood matter such as plastic items is single because of its Thread Forming TF line structure; Less with the junction plane of plastic items, the pretightening force that is difficult to provide enough is exerted pressure with all directions of reply external environment, finally causes the loosening of plastic items and comes off.Must consider factor in many ways, make plastic items in complex environment, remain the effective skin friction of screw thread, reach fastening purpose.
So; In order to solve the problem that comes off easily that tapping screw is connected with softwood matter component in the existing technology, the utility model provides a kind of tapping screw, comprises screw head and the screw rod that is connected with screw head; Wherein, Equidistantly distributed first screw thread and second screw thread on the said screw rod vertically, the thread height of said first screw thread is greater than the thread height of second screw thread, and the tooth form angle of first screw thread is less than the tooth form angle of second screw thread.
For further addressing the above problem, the tooth form angle of above-mentioned first screw thread is preferably the 20-40 degree, and the tooth form angle of second screw thread is preferably the 50-70 degree.
For further addressing the above problem, the tooth form angle of above-mentioned first screw thread is preferably 30 degree, and the tooth form angle of second screw thread is preferably 60 degree.
For further addressing the above problem, the thread height of above-mentioned first screw thread is preferably 2 times of the second thread profile height.
For further addressing the above problem, the Major Diam of above-mentioned first screw thread is preferably 2.95-6.1mm, and the Major Diam of second screw thread is preferably 2.45-5mm, and the screw thread path is preferably 1.75-3.9mm, and pitch is preferably 2.1-3.1mm.
For further addressing the above problem, above-mentioned screw head can be hexagon prism shape, and an end face of said hexagon prism is connected with screw rod.
For further addressing the above problem, be provided with the flange that radially extends around the above-mentioned hexagon prism end face that is connected with screw rod.
For further addressing the above problem, above-mentioned screw head can be the circular arc platform, and an end of said circular arc platform links to each other with screw rod, and the other end of circular arc platform is provided with the groove that is used to transmit torsion.
For further addressing the above problem, above-mentioned groove can be interior hexagonal or interior six flower shapes.
For further addressing the above problem, the end of above-mentioned screw rod is rounded or truncated cone shape.
Compared with prior art; The tapping screw of the utility model improves the Thread Forming TF on the screw rod; Two have been adopted no matter from thread height, still tooth form angle worm structure all inequality; Such screw thread modular design can increase the area of contact between screw flight and the plastic items, effectively raises the fastening combination force of screw rod and plastic items.
Additional aspect of the utility model and advantage part in the following description provide, and part will become obviously from the following description, or recognize through the practice of the utility model.
Description of drawings
Fig. 1 is the tapping screw schematic representation of a kind of mode of execution of the utility model.
Fig. 2 is the tapping screw schematic representation of the another kind of mode of execution of the utility model.
Fig. 3 is the tapping screw schematic representation of another mode of execution of the utility model.
Fig. 4 is the thread profile schematic representation of the utility model mode of execution.
Fig. 5 is the screw afterbody distortion schematic representation of the utility model mode of execution.
Fig. 6 is the screw head groove shapes schematic representation of mode of execution shown in Figure 3.
Embodiment
Be elaborated below in conjunction with the embodiment of accompanying drawing to the utility model, the example of said mode of execution is shown in the drawings, and wherein identical from start to finish or similar label is represented identical or similar elements or the element with identical or similar functions.Be exemplary through the embodiment who is described with reference to the drawings below, only be used to explain the utility model, and can not be interpreted as restriction the utility model.
In the description of the utility model; It will be appreciated that; Term " vertically ", " radially ", " length ", " width ", " thickness ", " on ", the orientation of indications such as D score, " preceding ", " back ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward " or position relation be for based on orientation shown in the drawings or position relation; Only be to describe with simplifying for the ease of describing the utility model; Rather than the device or the element of indication or hint indication must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as restriction to the utility model.In the description of the utility model, except as otherwise noted, the implication of " a plurality of " is two or more.
In the description of the utility model, need to prove that only if clear and definite regulation and qualification are arranged in addition, term " installation ", " linking to each other ", " connection " should be done broad understanding, for example, can be to be fixedly connected, also can be to removably connect, or connect integratedly; Can be mechanical connection, also can be to be electrically connected; Can be directly to link to each other, also can link to each other indirectly through intermediary, can be the connection of two element internals.For those of ordinary skill in the art, can concrete condition understand the concrete implication of above-mentioned term in the utility model.
As shown in Figure 1, the tapping screw of a kind of mode of execution of the utility model comprises screw head 1 and screw rod 2, and screw head 1 is connected with screw rod 2, has Thread Forming TF on the screw rod 2, its role is to bottom outlet to softwood matter such as plastic items and carries out tapping and be fastenedly connected.Screw head 1 is one-body molded with screw rod 2, and the material of screw head and screw rod adopts the requirement of conventional tapping screw to get final product, and forms as adopting material preparations such as steel for carburizing and heat-treated steel.Thread Forming TF comprises first screw thread 3 and second screw thread, 4, the first screw threads 3 and second screw thread 4 axially equidistantly distributing along screw rod 2.The shape of screw head 1 is not special to be limited, and this mode of execution is preferably the hexagon prism shape, and an end face of hexagon prism is connected with screw rod 2.The employing hexagonal cylindricality that screw head 1 is adopted can provide bigger torsion.Be provided with the flange 5 that radially extends along end face around the hexagon prism end face; The extended flange shape of institute is not special to be limited; Wherein to have the material radially direct even because of it for round flange; Screw rod 2 is to the advantage of its stressed equalization, so preferably extend to round flange, the round flange shape can be the impartial disc-shape (as shown in Figure 1) of thickness.In this mode of execution; The hexagonal cylinder is preferably orthohexagonal cylinder, and the axial thickness of hexagonal cylinder is preferably 2.5-5.9mm, and the thickness of flange is preferably 0.4-1.0mm; The diameter of flange is preferably 5.8-13.5mm, and the regular hexagon inscribed circle diameter of hexagonal cylinder is preferably 3.86-10.00mm.
As shown in Figure 2, the another kind of mode of execution of the utility model comprises screw head 1 and screw rod 2; Screw head 1 is connected with screw rod 2; Have Thread Forming TF on the screw rod 2, Thread Forming TF comprises first screw thread 3 and second screw thread, 4, the first screw threads 3 and second screw thread 4 axially equidistantly distributing along screw rod 2.Screw head 1 be shaped as the hexagon prism shape, an end face of hexagon prism is connected with screw rod 2.Be provided with the round flange 5 that radially extends along end face around the hexagon prism end face, compared to Figure 1 different places be that round flange 5 is shaped as the radially flange shape of gradual change of thickness, the screw preparation process property of flange shape is better.In this mode of execution, the hexagonal cylinder is preferably orthohexagonal cylinder, and the axial thickness of hexagonal cylinder is preferably 3.2-6.7mm, and the diameter of flange is preferably 4.1-12.8mm, and the regular hexagon inscribed circle diameter of hexagonal cylinder is preferably 3.82-8.00mm.
As shown in Figure 3, another mode of execution of the utility model comprises screw head 1 and screw rod 2; Screw head 1 is connected with screw rod 2; Have Thread Forming TF on the screw rod 2, Thread Forming TF comprises first screw thread 3 and second screw thread, 4, the first screw threads 3 and second screw thread 4 axially equidistantly distributing along screw rod 2.Different is with above-mentioned mode of execution; This mode of execution screw head 1 be shaped as round arc platform shaped; One end of circular arc platform is connected with screw rod 2, and the other end of circular arc platform (free end of screw head) end face is provided with the groove 7 that transmits torsion, and the shape of groove 7 can be interior hexagonal or interior six flower shapes; This mode of execution is preferably interior six flower shapes, and is as shown in Figure 6.The circumscribed circle diameter of interior six flowers of groove 7 is preferably more than the screw thread path of said screw rod 2, and the interior six flower circumscribed circle diameters of groove are preferably 2.8-5.6mm.The axial thickness of circular arc platform is preferably 2.15-4.6mm, and the axis of great circle of circular arc platform (with the connecting end end face diameter of screw 2) is preferably 5.3-12mm.This design can be transmitted bigger torsion moment, and good to neutrality, improves efficiency of assembling, and is very easy to use.
As shown in Figure 4, the tooth form of the utility model double thread is not special to be limited, and can preferably adopt triangle for triangle, trapezoidal etc.The thread height of first screw thread 3 is greater than the thread height of second screw thread 4, and the tooth form angle b of first screw thread 3 is less than the tooth form angle a of second screw thread 4.The tooth form angle b of first screw thread 3 is preferably the 20-40 degree, more preferably 30 degree; The tooth form angle a of second screw thread 4 is preferably the 50-70 degree, more preferably 60 degree.The thread height of first screw thread 3 is preferably 2 times of second screw thread, 4 thread heights.As shown in Figure 1, the Major Diam of first screw thread 3 is preferably 2.95-6.1mm on the screw rod 2, and the Major Diam of second screw thread 4 is preferably 2.45-5mm, and the screw thread path of screw rod 2 is preferably 1.75-3.9mm, and pitch is preferably 2.1-3.1mm.Need clear and definite to be, pitch is meant distance between the adjacent two-supremes tooth of first screw thread (or the distance between the adjacent two low teeth of second screw thread) in the utility model, also equals 2 times of distance between first screw thread, the two height teeth adjacent with second screw thread.The tapping screw of the utility model is through special first screw thread 3 on the screw rod 2 and the structure of second screw thread 4, being fastenedly connected of realization and softwood matter such as plastic items.Because of this screw rod adopts two threaded line, the particular design that thread height difference and angle are also different makes the area of contact of screw rod and plastic items increase, and can effectively strengthen the combination force with plastic items.
Further, as shown in Figure 5, the utility model at the end of the screw 2 vertex 6 is not particularly limited, and can be naturally-made thread Chan spire point can be rounded or truncated inverted cone of the top end.The soft materials before the tapping of the utility model screw such as the aperture of plastic substrate bottom outlet are preferably more than the screw flight path, and less than second Major Diam, are preferably 2-4.7mm, and the hole depth of bottom outlet is preferably greater than 2 times that equal first Major Diam.Wherein, Screw rod 2 ends can adopt the structure of difform terminal vertex 6 to different applications, can be used for the real plastic items of fastening thicker such as, the screw of sharp apex; Make fastening back tip of screw still be in component inside, so just can sharply not hurt sb.'s feelings because of end; And rounded or truncated cone shape tip of screw are terminal level and smooth because of it, then can be applicable to allow tip of screw to expose the occasion of environment.
Need to prove in addition; Each concrete technical characteristics described in above-mentioned embodiment under reconcilable situation, can make up through any suitable manner; For fear of unnecessary repetition, the utility model is to the explanation no longer separately of various possible compound modes.In addition, also can carry out combination in any between the various mode of execution of the utility model, as long as its thought without prejudice to the utility model, it should be regarded as the scope that the utility model is contained equally.
Claims (10)
1. tapping screw; Comprise screw head and the screw rod that is connected with screw head; It is characterized in that; Equidistantly distributed first screw thread and second screw thread on the said screw rod vertically, the thread height of said first screw thread is greater than the thread height of second screw thread, and the tooth form angle of first screw thread is less than the tooth form angle of second screw thread.
2. tapping screw according to claim 1 is characterized in that, the tooth form angle of said first screw thread is the 20-40 degree, and the tooth form angle of second screw thread is the 50-70 degree.
3. tapping screw according to claim 2 is characterized in that, the tooth form angle of said first screw thread is 30 degree, and the tooth form angle of second screw thread is 60 degree.
4. tapping screw according to claim 1 is characterized in that, the thread height of said first screw thread is 2 times of the second thread profile height.
5. tapping screw according to claim 1 is characterized in that, the Major Diam of said first screw thread is 2.95-6.1mm, and the Major Diam of second screw thread is 2.45-5mm, and the screw thread path is 1.75-3.9mm, and pitch is 2.1-3.1mm.
6. tapping screw according to claim 1 is characterized in that, said screw head is the hexagonal cylindricality, and an end face of said hexagon prism is connected with screw rod.
7. tapping screw according to claim 6 is characterized in that, is provided with the flange that radially extends around the said hexagon prism end face that is connected with screw rod.
8. tapping screw according to claim 1 is characterized in that, said screw head is the circular arc platform, and an end of said circular arc platform links to each other with screw rod, and the other end of circular arc platform is provided with the groove that is used to transmit torsion.
9. tapping screw according to claim 8 is characterized in that, said groove is interior hexagonal or interior six flower shapes.
10. tapping screw according to claim 1 is characterized in that, the end of said screw rod is rounded or truncated cone shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220021315 CN202545498U (en) | 2012-01-18 | 2012-01-18 | Self-tapping screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220021315 CN202545498U (en) | 2012-01-18 | 2012-01-18 | Self-tapping screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202545498U true CN202545498U (en) | 2012-11-21 |
Family
ID=47166139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220021315 Expired - Fee Related CN202545498U (en) | 2012-01-18 | 2012-01-18 | Self-tapping screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202545498U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI622710B (en) * | 2017-05-02 | 2018-05-01 | 徐敏豪 | Screw for a thin iron plate |
| CN111936279A (en) * | 2018-04-09 | 2020-11-13 | 希尔曼集团股份有限公司 | Screw-type fastener for concrete and hurricane resistant applications |
-
2012
- 2012-01-18 CN CN 201220021315 patent/CN202545498U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI622710B (en) * | 2017-05-02 | 2018-05-01 | 徐敏豪 | Screw for a thin iron plate |
| CN111936279A (en) * | 2018-04-09 | 2020-11-13 | 希尔曼集团股份有限公司 | Screw-type fastener for concrete and hurricane resistant applications |
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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: 20121121 Termination date: 20200118 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |