CN204784057U - Self -threading screw - Google Patents
Self -threading screw Download PDFInfo
- Publication number
- CN204784057U CN204784057U CN201520485865.1U CN201520485865U CN204784057U CN 204784057 U CN204784057 U CN 204784057U CN 201520485865 U CN201520485865 U CN 201520485865U CN 204784057 U CN204784057 U CN 204784057U
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- thread
- screw
- tapping screw
- contact
- angle
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Abstract
The utility model discloses a self -threading screw, including spiral shell head, screw rod and thread, the thread includes the first contact surface that is close to self -threading screw afterbody one side to and be close to the second contact surface on one side of the self -threading screw head, form the tooth form angle between first contact surface and the second contact surface, the tooth form angle is 15 - 45, the first contact surface root of thread is connected with the axial of the screw rod through the arc changeover portion, thread second contact surface root is direct to be connected with the axial of the screw rod, both formation obtuse angles that sharply cross. The afterbody and the the axial of the screw rod junction of its thread set up the arc changeover portion, attack fast when being convenient for the self tapping, the head of thread with the axial of the screw rod then be the straight line and form the obtuse angle and be connected, moment when strengthening self -threading screw and withdrawing from stops screw yi songtuo.
Description
Technical field
The utility model relates to technical field of fastening, discloses a kind of tapping screw especially.
Background technique
Tapping screw, English by name Self-tappingScrew in the pre-drilled of metal or nonmetallic material, attacks the one getting out female thread joined together voluntarily have threaded fasteners.Tapping screw is used for the connection between thin sheet metal (steel plate, saw plate etc.).During connection, first thread Pilot hole is made to connected piece, then tapping screw is screwed in the thread Pilot hole of connected piece.Thread surface due to tapping screw has higher hardness (>=45HRC), can in the thread Pilot hole of connected piece tapping internal thread, thus formed connect.
Tapping screw pursue with little screw moment accurately tapping internal thread time can obtain larger fastening force, technical main improvement concentrate on thread structure and arrangement on.Such as, tapping screw disclosed in patent CN103562571A, cuts its top and forms tool withdrawal groove, make coupling protrusion shaping in the bottom surface of described tool withdrawal groove along part or all of end of the side connecting described regular screw threads tooth in institute's regular screw threads tooth.Its excess thickness portion of having imbedded the workpiece of tool withdrawal groove according to described tapping screw embeds in coupling protrusion, even if workpiece expands like this, shrink or vibrate and also can play the effect preventing from loosening well.And for example, tapping screw disclosed in patent CN202187994U, screw rod arranges protruding uneven thread, to reduce the area of cut of tapping screw and radial force to reduce the collapsing force to clear-cut property material installation and thin-walled equipment, increase chip space, improve guidance quality and there is shock-proof check performance.
Above-mentioned patented technology is by thread in addition optimal design as a whole, is improved by the means such as relief groove structure, not contour thread design increased.So, improve and be only limitted to be optimized the arrangement of thread entirety, and the structure of thread itself is considered less.In fact, when being screwed into the connecting materials such as sheetmetal at tapping screw, the tail end of thread, as the side of self tapping when being screwed into, needs just can enter in connecting material fast in the less power that screws; The head end of thread is then the front end of tapping screw when exiting, and needs on the contrary to prevent from just exiting under the less power that screws, to avoid getting loose of tapping screw.
Model utility content
The purpose of this utility model is to provide a kind of tapping screw, and afterbody and the screw axial joint of its thread arrange arc-shaped transition section, shoot fast when being convenient to self tapping; Then be straight line and form obtuse angle to be connected with screw axial at the head of thread, strengthen moment when tapping screw exits, stop screw easily to get loose.
The utility model provides a kind of tapping screw, comprising:
Spiral shell head, is positioned at the head of tapping screw;
Screw rod, is connected with spiral shell head; With
Thread, is arranged on the border of screw rod;
Described thread comprises the first surface of contact near tapping screw afterbody side, and the second surface of contact near tapping screw head side,
Form thread form angle between first surface of contact and the second surface of contact, described thread form angle is 15 °-45 °;
Described thread first surface of contact root is connected with screw axial by arc-shaped transition section; Described thread second surface of contact root is directly connected with screw axial, and both straight lines cross formation obtuse angle.
Preferably, described thread form angle is 32 °.
Thread adopts less thread form angle, particularly be equivalent to the thread form angle of prior art intermediate cam shape screw thread usually about the half of 60 °, when screw is shot, thread can be made to bear larger axial thrust load, and radial tension when can reduce screw assembling, to ensure that enough axial forces produce connecting material displacement, and make the flowing of the connecting materials such as sheetmetal convenient, easily shoot screw, simultaneously also because radial tension is less, the connecting materials such as security deposit's metal thin plate are not damaged, therefore while well meeting connection needs, also the stability repeatedly connected is increased, therefore it is good to repeat installation, can increase the service life.
Root part of screw tooth adopts the larger thread form angle at obtuse angle, can allow the connecting materials such as sheetmetal better and thread contact, can prevent screw thread pressurized from rupturing, and improve Security and the fatigue resistance of root part of screw tooth, avoid thread to damage.
Preferably, the vertical height of the arc-shaped transition section correspondence of described thread first surface of contact root, the ratio accounting for described thread tooth long is no more than 50%, and preferred accounting is 20%-25%, and namely 1/5 to 1/4.
Preferably, the tooth spacing of described thread is greater than the corresponding radius of a circle of arc of the arc-shaped transition section of described thread first surface of contact root.
Preferably, the vertical line perpendicular to screw axial is made with the summit of thread form angle, the angle that described first surface of contact and described vertical line are formed is the first tilt angle, and the angle that described second surface of contact and described vertical line are formed is the second tilt angle, and the angle at the first tilt angle and the second tilt angle is equal.
The both sides of thread adopt identical tilt angle, the setting depth of both sides can be balanced, and obtain larger side covering, promote the pressure relief of thread contact coverage rate, thus the tensile strength of raising tapping screw, twisting strength and fatigue resistance, simultaneously manufacture cost also corresponding reduction.
Preferably, the tapered contracting tail of afterbody of described screw rod, is convenient to self tapping.
In order to expand the using scope of tapping screw, waterproof ability during to realize environment out of doors and classification of waterproof, the neck location that spiral shell head is connected with screw rod is provided with silicone gasket, for waterproof.
Preferably, silicone gasket is also provided with flat gasket near the side of spiral shell head, and spiral shell head, flat gasket and silicone gasket are linked in sequence successively.
Revealing unexpected unlatching when putting open air for avoiding tapping screw, namely promoting the anti-theft feature of tapping screw, described spiral shell head offering mounting hole, the shaft axis of mounting hole, deviate from screw rod central axis and with the centerline axis parallel of screw rod.
The beneficial effects of the utility model have:
1, increase R angle (arc-shaped transition) and the second contact surface side of thread (when screw exits front extreme direction) keeps its straight line to connect and forms obtuse angle in first contact surface side (when namely screw is shot front extreme direction) of thread, reach the effect that screw locks " Yi Jinnan goes out "; The thread form angle of thread is than conventional 60 ° less and be preferably set to 32 °, and its stress surface is also diminished thereupon, can attachment screw when locking moment less.
2, the mounting hole portion grooved on tapping screw spiral shell head adopts the design of eccentric circle post holes, the extracting tools such as screw-driver conventional on the market are at present made not possess its disassembling function, special extracting tool need be customized and just can complete dismounting, thus reach the anti-theft effect revealed when putting outdoor.
3, assemble silicone gasket at tapping screw spiral shell head and screw rod connecting neck portion, play waterproof sealing effect when tapping screw is locked in the connecting materials such as sheetmetal completely.
Below in conjunction with the drawings and specific embodiments, the utility model is described further.
Accompanying drawing explanation
Fig. 1 is the sectional structure schematic diagram of the tapping screw of embodiment 1.
Fig. 2 is the screwed tooth structure schematic diagram of the tapping screw of embodiment 1.
Fig. 3 is the sectional structure schematic diagram of the tapping screw of embodiment 2.
Fig. 4 is the left TV structure schematic diagram of the tapping screw of embodiment 2.
Fig. 5 is the screwed tooth structure schematic diagram of the tapping screw of embodiment 2.
In figure, 1-spiral shell head, 2-screw rod, 3-thread, 4-silicone gasket, 5-flat gasket, 6-first surface of contact, 7-second surface of contact, 8-arc-shaped transition section, 9-mounting hole.
Embodiment
The present embodiment is the utility model preferred implementation, and other its principles all are identical with the present embodiment or approximate with basic structure, all within the utility model protection domain.
Embodiment 1
Incorporated by reference to referring to attached Fig. 1 and 2, the tapping screw of the present embodiment, comprising:
Spiral shell head 1, is positioned at the head of tapping screw;
Screw rod 2, is connected with spiral shell head 1, is positioned at the afterbody of tapping screw;
Thread 3, is arranged on the border of screw rod 2;
Silicone gasket (not shown), is arranged at the neck location that spiral shell head 1 is connected with screw rod 2, for waterproof; With
Flat gasket 5, is arranged at the neck location that spiral shell head 1 is connected with screw rod 2, and near the side of spiral shell head 1; Spiral shell head 1, flat gasket 5 and silicone gasket (not shown) are linked in sequence successively;
Described thread 3 comprises the first surface of contact 6 near tapping screw afterbody side, and the second surface of contact 7 near tapping screw head side,
Form thread form angle between first surface of contact 6 and the second surface of contact 7, described thread form angle is 32 °;
Described thread first surface of contact 6 root is connected with screw axial by arc-shaped transition section 8; Described thread second surface of contact 7 root is directly connected with screw axial, and both straight lines cross formation obtuse angle;
Concrete, the tooth spacing of described thread 3 is greater than the radius R of the arc corresponding circle of the arc-shaped transition section 8 of described thread first surface of contact 6 root;
The vertical height of arc-shaped transition section 8 correspondence of described thread 3 first surface of contact 6 root, the ratio accounting for described thread 3 tooth long is about 20%-25%, and namely 1/5 to 1/4;
The vertical line perpendicular to screw axial is made with the summit of thread form angle, the angle that described first surface of contact and described vertical line are formed is the first tilt angle, the angle that described second surface of contact and described vertical line are formed is the second tilt angle, and the angle at the first tilt angle and the second tilt angle is equal.
Thread adopts less thread form angle, particularly be equivalent to the thread form angle of prior art intermediate cam shape screw thread usually about the half of 60 °, when screw is shot, thread can be made to bear larger axial thrust load, and radial tension when can reduce screw assembling, to ensure that enough axial forces produce connecting material displacement, and make the flowing of the connecting materials such as sheetmetal convenient, easily shoot screw, simultaneously also because radial tension is less, the connecting materials such as security deposit's metal thin plate are not damaged, therefore while well meeting connection needs, also the stability repeatedly connected is increased, therefore it is good to repeat installation, can increase the service life.
Root part of screw tooth adopts the larger thread form angle at obtuse angle, can allow the connecting materials such as sheetmetal better and thread contact, can prevent screw thread pressurized from rupturing, and improve Security and the fatigue resistance of root part of screw tooth, avoid thread to damage.
The both sides of thread adopt identical tilt angle, the setting depth of both sides can be balanced, and obtain larger side covering, promote the pressure relief of thread contact coverage rate, thus the tensile strength of raising tapping screw, twisting strength and fatigue resistance, simultaneously manufacture cost also corresponding reduction.
As the preferred version of the present embodiment, the tapered contracting tail of afterbody of screw rod, is convenient to self tapping.
Embodiment 2
Incorporated by reference to referring to accompanying drawing 3 to 5, the tapping screw of the present embodiment, comprising:
Spiral shell head 1, is positioned at the head of tapping screw;
Screw rod 2, is connected with spiral shell head 1, is positioned at the afterbody of tapping screw; The tapered contracting tail of afterbody of screw rod, is convenient to self tapping;
Thread 3, is arranged on the border of screw rod 2;
Silicone gasket 4, is arranged at the neck location that spiral shell head 1 is connected with screw rod 2, for waterproof; With
Flat gasket 5, is arranged at the neck location that spiral shell head 1 is connected with screw rod 2, and near the side of spiral shell head 1; Spiral shell head 1, flat gasket 5 and silicone gasket 4 are linked in sequence successively;
Described spiral shell head 1 offers mounting hole 9, the shaft axis of mounting hole 9, deviate from screw rod 2 central axis and with the centerline axis parallel of screw rod 2, make the extracting tools such as screw-driver conventional on the market at present not possess its disassembling function;
Described thread 3 comprises the first surface of contact 6 near tapping screw afterbody side, and the second surface of contact 7 near tapping screw head side,
Form thread form angle between first surface of contact 6 and the second surface of contact 7, described thread form angle is 30 °;
Described thread first surface of contact 6 root is connected with screw axial by arc-shaped transition section 8; Described thread second surface of contact 7 root is directly connected with screw axial, and both straight lines cross formation obtuse angle;
Concrete, the tooth spacing of described thread 3 is greater than the corresponding radius of a circle of arc of the arc-shaped transition section 8 of described thread first surface of contact 6 root;
The vertical height of the arc-shaped transition section correspondence of described thread first surface of contact 6 root, the ratio accounting for described thread tooth long is about 20%-25%, and namely 1/5 to 1/4.
Thread adopts less thread form angle, particularly be equivalent to the thread form angle of prior art intermediate cam shape screw thread usually the half of 60 °, when screw is shot, thread can be made to bear larger axial thrust load, and radial tension when can reduce screw assembling, to ensure that enough axial forces produce connecting material displacement, and make the flowing of the connecting materials such as sheetmetal convenient, easily shoot screw, simultaneously also because radial tension is less, the connecting materials such as security deposit's metal thin plate are not damaged, therefore while well meeting connection needs, also the stability repeatedly connected is increased, therefore it is good to repeat installation, can increase the service life.
Root part of screw tooth adopts the larger thread form angle at obtuse angle, can allow the connecting materials such as sheetmetal better and thread contact, can prevent screw thread pressurized from rupturing, and improve Security and the fatigue resistance of root part of screw tooth, avoid thread to damage.
As the preferred version of the present embodiment, the vertical line perpendicular to screw axial is made with the summit of thread form angle, the angle that described first surface of contact and described vertical line are formed is the first tilt angle, the angle that described second surface of contact and described vertical line are formed is the second tilt angle, and the angle at the first tilt angle and the second tilt angle is equal.
The both sides of thread adopt identical tilt angle, the setting depth of both sides can be balanced, and obtain larger side covering, promote the pressure relief of thread contact coverage rate, thus the tensile strength of raising tapping screw, twisting strength and fatigue resistance, simultaneously manufacture cost also corresponding reduction.
Above disclosedly be only preferred embodiment of the present utility model, certainly can not limit the interest field of the utility model with this, therefore according to the equivalent variations that the utility model claim is done, still belong to the scope that the utility model is contained.
Claims (10)
1. a tapping screw, is characterized in that: comprising:
Spiral shell head, is positioned at the head of tapping screw;
Screw rod, is connected with spiral shell head; With
Thread, is arranged on the border of screw rod;
Described thread comprises the first surface of contact near tapping screw afterbody side, and the second surface of contact near tapping screw head side,
Form thread form angle between first surface of contact and the second surface of contact, described thread form angle is 15 °-45 °.
2. tapping screw according to claim 1, is characterized in that: described thread first surface of contact root is connected with screw axial by arc-shaped transition section; Described thread second surface of contact root is directly connected with screw axial, and both straight lines cross formation obtuse angle.
3. tapping screw according to claim 2, is characterized in that: described thread form angle is 32 °.
4. the tapping screw according to Claims 2 or 3, is characterized in that: the vertical height of the arc-shaped transition section correspondence of described thread first surface of contact root, and the ratio accounting for described thread tooth long is no more than 50%.
5. the tapping screw according to Claims 2 or 3, is characterized in that: the tooth spacing of described thread is greater than the corresponding radius of a circle of arc of the arc-shaped transition section of described thread first surface of contact root.
6. the tapping screw according to Claims 2 or 3, it is characterized in that: make the vertical line perpendicular to screw axial with the summit of thread form angle, the angle that described first surface of contact and described vertical line are formed is the first tilt angle, the angle that described second surface of contact and described vertical line are formed is the second tilt angle, and the angle at the first tilt angle and the second tilt angle is equal.
7. the tapping screw according to Claims 2 or 3, is characterized in that: the tapered contracting tail of afterbody of described screw rod.
8. the tapping screw according to Claims 2 or 3, is characterized in that: the neck location that spiral shell head is connected with screw rod is provided with silicone gasket.
9. tapping screw according to claim 8, is characterized in that: silicone gasket is also provided with flat gasket near the side of spiral shell head, and spiral shell head, flat gasket and silicone gasket are linked in sequence successively.
10. the tapping screw according to Claims 2 or 3, is characterized in that: described spiral shell head offers mounting hole, the shaft axis of mounting hole, deviate from screw rod central axis and with the centerline axis parallel of screw rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520485865.1U CN204784057U (en) | 2015-07-07 | 2015-07-07 | Self -threading screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520485865.1U CN204784057U (en) | 2015-07-07 | 2015-07-07 | Self -threading screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204784057U true CN204784057U (en) | 2015-11-18 |
Family
ID=54524112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520485865.1U Expired - Fee Related CN204784057U (en) | 2015-07-07 | 2015-07-07 | Self -threading screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204784057U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111219401A (en) * | 2020-03-11 | 2020-06-02 | 上海索力迪紧固件系统有限公司 | 5G smart phone-based ultra-small precise anti-loosening screw and manufacturing process thereof |
| CN116517941A (en) * | 2023-06-28 | 2023-08-01 | 沈阳市黎阳机械构件制造有限公司 | 45-degree self-tapping thread, composite screw sleeve and preparation and use methods of screw sleeve |
-
2015
- 2015-07-07 CN CN201520485865.1U patent/CN204784057U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111219401A (en) * | 2020-03-11 | 2020-06-02 | 上海索力迪紧固件系统有限公司 | 5G smart phone-based ultra-small precise anti-loosening screw and manufacturing process thereof |
| CN116517941A (en) * | 2023-06-28 | 2023-08-01 | 沈阳市黎阳机械构件制造有限公司 | 45-degree self-tapping thread, composite screw sleeve and preparation and use methods of screw sleeve |
| CN116517941B (en) * | 2023-06-28 | 2023-10-13 | 沈阳市黎阳机械构件制造有限公司 | 45-degree self-tapping thread, composite screw sleeve and preparation and use methods of screw sleeve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 518000, 1F2, west of No. 27, Guangsha Road, ten industrial zone, lower Town, Fuyong Town, Shenzhen, Guangdong, Baoan District Patentee after: Shenzhen deep impression fastening Polytron Technologies Inc Address before: 518000, 1F2, west of No. 27, Guangsha Road, ten industrial zone, lower Town, Fuyong Town, Shenzhen, Guangdong, Baoan District Patentee before: Deep image fastening system (Shenzhen) Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151118 Termination date: 20180707 |