CN210397378U - Anti-eccentricity self-tapping screw - Google Patents
Anti-eccentricity self-tapping screw Download PDFInfo
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- CN210397378U CN210397378U CN201921499587.XU CN201921499587U CN210397378U CN 210397378 U CN210397378 U CN 210397378U CN 201921499587 U CN201921499587 U CN 201921499587U CN 210397378 U CN210397378 U CN 210397378U
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Abstract
The utility model discloses a prevent eccentric self-tapping screw, including integrated into one piece's nut and screw rod, the screw rod includes screw thread portion and location portion, and screw thread portion comprises the external screw thread of member and member periphery, and location portion includes cambered surface section and cylinder section at least, and the cylinder section is connected with the member of screw thread portion, and the cambered surface section directly links to each other or links to each other through the changeover portion with the cylinder section. The utility model discloses be equipped with location portion at the screw thread end, can realize preliminary location before the thread cutting and in time rectify a deviation, guarantee the axiality behind the mounting screw, prevent to take place off-centre, improve construction quality and work efficiency.
Description
Technical Field
The utility model belongs to the technical field of mechanical fastener and specifically relates to an anti-decentration self-tapping screw.
Background
The self-tapping screw, also called fast-threading screw, is a quick-mounting fastener made of steel, whose surface is passivated by galvanizing or made of stainless steel. Self-tapping screws are used to self-tap mating internal threads into pre-drilled holes of metallic or non-metallic materials and to join them. During connection, a bottom hole is formed in the connected piece, and then the tapping screw is screwed into the bottom hole of the connected piece. The existing tapping screw adopts a thread execution standard of tapping screw (GB/T5280-2002), and the thread end of the tapping screw has two forms of a taper end and a flat end. As shown in fig. 1, a conventional tapping screw 1 employs a thread end having a tapered end, and when the tapping screw 1 is screwed in, the tapping thread participates in the cutting of a pilot hole too early, which causes an error that the tapping screw cannot be corrected in time. The tapping screw at the flat end can be eccentric after being tapped into a certain depth, and cannot be preliminarily positioned and timely adjusted. In a word, in the process that the self-tapping screw is matched with the bottom hole, because the tail end of the thread directly participates in the cutting of the bottom hole too early, the self-tapping screw is difficult to be ensured to be matched with the coaxiality of the bottom hole, the matched construction quality is difficult to grasp or correct in time, the self-tapping screw is easy to be eccentric, the matching is deviated, and the construction quality is low, even reworking or damage is caused.
SUMMERY OF THE UTILITY MODEL
The applicant aims at the defects that the thread of the existing tapping screw participates in cutting too early, construction quality is difficult to grasp or correction is carried out in time and the like, and provides the anti-eccentricity tapping screw with a reasonable structure, which can carry out initial positioning before screwing in the thread, correct the correction in time during installation, ensure the coaxiality of the installed tapping screw and improve the construction quality and efficiency.
The utility model discloses the technical scheme who adopts as follows:
the utility model provides an prevent off-centre self-tapping screw, includes integrated into one piece's nut and screw rod, and the screw rod includes screw thread portion and location portion, and screw thread portion comprises the external screw thread of member and member periphery, and location portion includes cambered surface section and cylinder section at least, and the cylinder section is connected with the member of screw thread portion, and the cambered surface section directly links to each other or links to each other through the changeover portion with the cylinder section.
As a further improvement of the above technical solution:
the transition section is positioned between the arc surface section and the cylindrical section and is coaxially transited to the bottom surface circle of the cylindrical section from the maximum circle of the arc surface section.
The maximum circle diameter of the cambered surface section is smaller than the diameter of the cylindrical section, and the difference is not smaller than 0.8 mm.
The maximum diameter of the arc surface section is the same as that of the cylindrical section.
The cambered surface section is hemispherical.
The diameter of the hemisphere circle of the cambered surface section is smaller than that of the cylindrical section, and the difference value is not smaller than 0.8 mm.
The diameter of the cylindrical section is smaller than the diameter of the external thread section of the thread part.
The diameter of the cylindrical section is the same as or similar to the rod member diameter of the threaded part.
The length of the cylindrical section is 5 mm.
The nut is of a round cap type, a countersunk head type or a regular polygonal type.
The utility model has the advantages as follows:
the utility model discloses a prevent off-centre self-tapping screw and be equipped with location portion at the screw thread end, the cambered surface section at first gets into the bottom hole when the installation, cambered surface section surface is glossy cambered surface, twist the bottom hole easily, the blind hole agrees with it, play the effect of preliminary location, cylinder section and bottom hole, the blind hole forms a limited clearance fit, guarantee to prevent off-centre self-tapping screw and bottom hole, the axiality of blind hole assembles at certain deviation within range, in time rectify a deviation, prevent eccentric installation, the changeover portion makes cambered surface section and cylinder section smooth transition, prevent to lead to the fact destruction to the hole end in the cooperation process, prevent that the hole end from being enlarged, influence the effect of rectifying of cylinder section, screw portion participates in the assembly back according to the state that predesigned to the bottom hole, the blind hole cuts the installation. The utility model discloses can realize preliminary location before the thread cutting and in time rectify, guarantee the axiality behind the mounting screw, prevent to take place off-centre, improve construction quality and work efficiency.
Drawings
Fig. 1 is a schematic view of a conventional tapping screw.
Fig. 2 is a schematic view of the installation of the present invention.
Fig. 3 is a schematic diagram of the present invention.
Fig. 4 is an enlarged view of a portion a of fig. 3.
In the figure: 1. existing self-tapping screws; 2. a nut; 3. a screw; 4. a threaded portion; 5. a positioning part; 6. a cambered surface section; 7. a transition section; 8. a cylindrical section; 9. a first connecting piece; 10. and a second connecting piece.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 2 to 4, the anti-eccentric self-tapping screw of the present invention comprises a nut 2 and a screw rod 3, which are integrally formed, wherein the nut 2 is of a circular cap shape, a countersunk head shape, a regular polygonal shape or other shapes. The upper end surface of the screw cap 2 is provided with a straight-line-shaped, cross-shaped, inner hexagonal, quincunx or other-shaped groove. The screw 3 includes a screw portion 4 and a positioning portion 5, the screw portion 4 is constituted by a rod and an external thread of the outer periphery of the rod, and the positioning portion 5 is located at the tip of the screw portion 4. The positioning part 5 comprises an arc surface section 6, a transition section 7 and a cylindrical section 8, wherein the transition section 7 is positioned between the arc surface section 6 and the cylindrical section 8. The cylindrical section 8 is connected with the rod of the thread part 4, and the diameter of the cylindrical section 8 is smaller than the diameter of the external thread section of the thread part 4 and is the same as or similar to the rod diameter of the thread part 4. The length of the cylindrical section 8 is preferably 5 mm. The cambered surface section 6 is preferably hemispherical, the hemispherical diameter of the cambered surface section 6 is smaller than that of the cylindrical section 8, and the difference is not smaller than 0.8 mm. The transition section 7 is coaxially transited to the bottom circle of the cylindrical section 8 from the maximum circle of the cambered surface section 6 to form smooth transition.
The utility model discloses when implementing, at first process, make the bottom hole to connecting piece one 9, process, make the blind hole to connecting piece two 10. And then the eccentricity-preventing self-tapping screw is aligned with the bottom hole for pre-installation. The cambered surface section 6 of the eccentricity-preventing self-tapping screw firstly enters the bottom hole, and the surface of the cambered surface section 6 is a smooth cambered surface and can be easily screwed into the bottom hole and matched with the bottom hole for adjusting and positioning. Then the transition section 7 and the cylindrical section 8 of the anti-eccentric self-tapping screw also enter the bottom hole, the cylindrical section 8, the bottom hole and the blind hole form a limited clearance fit, the coaxiality of the anti-eccentric self-tapping screw, the bottom hole and the blind hole is guaranteed to be assembled within a certain deviation range, deviation is timely corrected, eccentric installation is prevented, the transition section 7 enables the cambered surface section 6 and the cylindrical section 8 to be in smooth transition, damage to the hole end in the matching process is prevented, the hole end is prevented from being enlarged, the deviation correcting effect of the cylindrical section 8 is influenced until the threaded portion 4 participates in assembly, and cutting installation is carried out on the bottom hole and the blind hole according to a pre-designed state. The external thread of the thread part 4 cuts and taps the bottom hole and the blind hole to complete the connection of the two connecting pieces.
The above description is illustrative of the present invention and is not intended to limit the present invention, and the present invention may be modified in any manner without departing from the spirit of the present invention. For example, the transition section 7 may be omitted, and the maximum circle diameter of the arc-shaped section 6 and the diameter of the cylindrical section 8 are set to be the same, and the arc-shaped section 6 and the cylindrical section 8 are directly connected.
Claims (10)
1. The utility model provides an anti-decentration self-tapping screw which characterized in that: including integrated into one piece's nut (2) and screw rod (3), screw rod (3) are including screw thread portion (4) and location portion (5), and screw thread portion (4) comprise the external screw thread of member and member periphery, and location portion (5) include cambered surface section (6) and cylinder section (8) at least, and cylinder section (8) are connected with the member of screw thread portion (4), and cambered surface section (6) directly link to each other or link to each other through changeover portion (7) with cylinder section (8).
2. The anti-eccentricity self-tapping screw according to claim 1, wherein: the transition section (7) is positioned between the cambered surface section (6) and the cylindrical section (8) and is coaxially transited from the maximum circle of the cambered surface section (6) to the bottom circle of the cylindrical section (8).
3. The anti-eccentricity self-tapping screw according to claim 2, wherein: the maximum circle diameter of the cambered surface section (6) is smaller than the diameter of the cylindrical section (8), and the difference is not smaller than 0.8 mm.
4. The anti-eccentricity self-tapping screw according to claim 1, wherein: the maximum circle diameter of the cambered surface section (6) is the same as that of the cylindrical section (8).
5. The anti-eccentricity self-tapping screw according to claim 1, wherein: the cambered surface section (6) is hemispherical.
6. The anti-eccentricity self-tapping screw according to claim 5, wherein: the diameter of the hemisphere circle of the cambered surface section (6) is smaller than that of the cylinder section (8), and the difference is not smaller than 0.8 mm.
7. The anti-eccentricity self-tapping screw according to claim 1, wherein: the diameter of the cylindrical section (8) is smaller than the diameter of the external thread section of the thread part (4).
8. The anti-eccentricity self-tapping screw according to claim 1, wherein: the diameter of the cylindrical section (8) is the same as or similar to the rod diameter of the thread part (4).
9. The anti-eccentricity self-tapping screw according to claim 1, wherein: the length of the cylindrical section (8) is 5 mm.
10. The anti-eccentricity self-tapping screw according to claim 1, wherein: the screw cap (2) is of a round cap type, a countersunk head type or a regular polygon type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921499587.XU CN210397378U (en) | 2019-09-10 | 2019-09-10 | Anti-eccentricity self-tapping screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921499587.XU CN210397378U (en) | 2019-09-10 | 2019-09-10 | Anti-eccentricity self-tapping screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210397378U true CN210397378U (en) | 2020-04-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921499587.XU Active CN210397378U (en) | 2019-09-10 | 2019-09-10 | Anti-eccentricity self-tapping screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210397378U (en) |
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2019
- 2019-09-10 CN CN201921499587.XU patent/CN210397378U/en active Active
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| CP01 | Change in the name or title of a patent holder |
Address after: 214117 No.8, Tonghu Road, Ehu Town, Xishan District, Wuxi City, Jiangsu Province Patentee after: Jiangsu Hengshang Energy Saving Technology Co.,Ltd. Address before: 214117 No.8, Tonghu Road, Ehu Town, Xishan District, Wuxi City, Jiangsu Province Patentee before: WUXI HENGSHANG DECORATION ENGINEERING Co.,Ltd. |