Self-tapping screw with plastic connecting belt

Abstract

The utility model relates to a self-tapping screw with a plastic connecting band, which comprises a screw cap, a screw rod connected with the screw cap, and a screw point at the lower end of the screw rod, a sinking groove is arranged in the middle of the screw cap, and the self-tapping screw is characterized in that the top end of the screw cap has a first diameter, the bottom end of the screw cap has a second diameter, and the second diameter is larger than the first diameter. The top end of the nail cap is a plane, and the bottom end of the nail cap is downwards provided with a protrusion. The nail has the advantages of being simple in structure, convenient to use, strong in nail point penetrating power and not prone to falling off after being used.

Description

Technical Field

[0001] The utility model belongs to the technical field of fasteners, in particular to a self-tapping screw and a plastic connecting belt with the screw. Background Art

[0002] JP2004308722A discloses a screw for driving, wherein the end face of the screw head is formed with a snap-fit ​​groove, and an annular protrusion is formed protruding from the end face forming the snap-fit ​​groove. However, the plane cross groove is easily deformed by the action of an automatic nail gun, which is not conducive to later disassembly.

[0003] US7516841B2 discloses a connecting strip having two strip-shaped bodies (5, 5) arranged so that they are separated from each other (2) and parallel to each other in the axial direction of the nail and a plurality of nail through holes (6a) are formed at appropriate intervals. However, the nails in the connecting strip are prone to damage the substrate. However, the above-mentioned nails cannot form self-drilling and are prone to damage the substrate. Utility Model Content

[0004] The utility model aims to solve the problems that existing screws are deformed and easy to fall off when struck, and to provide a self-tapping screw and a plastic connecting belt to avoid deformation and falling off when struck.

[0005] In order to achieve the above purpose, the utility model provides a self-tapping screw with a plastic connecting band, including: a self-tapping screw, including a nail cap and a nail rod connected to the nail cap, and a nail tip at the lower end of the nail rod, the nail rod is provided with a thread, characterized in that: the nail cap has a top end and a bottom end, wherein the top end is provided with a countersunk groove, the top end of the nail cap has a first diameter, the bottom end of the nail cap has a second diameter, wherein the second diameter is greater than the first diameter, the bottom end is connected to the top end in an arc, the top end of the nail cap is a plane, and the bottom end of the nail cap is provided with a protrusion downward, the plastic connecting band includes a retaining portion and a connecting portion, wherein a plurality of retaining portions are adjacent to each other, each retaining portion is connected by a connecting portion, a through hole is provided in the middle of the retaining portion, the edge of the retaining portion has an inclination angle, and the diameter of the edge of the retaining portion is smaller than the inner diameter of the protrusion.

[0006] Furthermore, the ratio of the depth of the countersunk groove to the thickness of the nail cap is in the range of 0.5 to 0.8, and the countersunk groove is a cross groove or a slotted groove.

[0007] Furthermore, the protrusion is ring-shaped.

[0008] Furthermore, a transition section is provided between the nail rod and the bottom end of the nail cap, wherein the transition section is in an arc shape.

[0009] Furthermore, the nail tip is arc-shaped.

[0010] Furthermore, the first diameter is 6 mm, the second diameter is 6.5 mm, the thickness of the nail cap is 2.5 mm to 2.7 mm, the height of the protrusion is 0.1 mm, and the inner diameter of the protrusion is 5.6 mm.

[0011] Furthermore, the holding portion includes a first holding portion and a second holding portion, each of the first holding portion and the second holding portion has a through hole in the middle, the first holding portion and the second holding portion are connected by a clamping portion, and the clamping portion is in communication with the through hole.

[0012] The beneficial effects of the utility model are:

[0013] 1. The thickened nail cap design is adopted, and the top of the nail cap adopts a large flat head design, which ensures the integrity of the concave cross groove or slot after the nail cap is impacted by the firing pin of the automatic nail gun, which is conducive to later disassembly.

[0014] 2. The bottom end of the nail cap is designed to be a concave protrusion, so that when the self-tapping screw is driven in, the retaining part of the plastic connecting belt can be torn off and remain intact between the self-tapping screw and the driven substrate, so that the concave protrusion plays a role in preventing loosening and falling off.

[0015] 3. The nail tip adopts an arc-shaped design, which is more conducive to passing through the base when shooting. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings.

[0017] Figure 1 It is a structural schematic diagram of the self-tapping screw of the utility model.

[0018] Figure 2 The utility model is a structural schematic diagram of a plastic connecting belt.

[0019] Figure 3 It is a schematic diagram of the structure of the nail cap.

[0020] Figure 4 This is a schematic diagram of the structure of the plastic connecting belt after being hit.

[0021] Explanation of the reference numerals: self-tapping screw 10; nail head 11; first diameter D1; second diameter D2; thickness T1; top end 111; groove 112; bottom end 113; protrusion 114; inner diameter D3; nail rod 12; nail tip 13; transition section 121; thread 122; plastic connecting band 20; first retaining portion 21; edge 211; diameter D4; second retaining portion 22; connecting portion 23; clamping portion 24; through hole 25; base 30. DETAILED DESCRIPTION Example

[0022] The structure of this embodiment is as follows Figure 1As shown, a self-tapping screw 10 includes a nail cap 11 and a nail rod 12 connected to the nail cap 11, and a nail tip 13 arranged at the lower end of the nail rod 12, the nail rod 12 is provided with a thread 122, the nail cap 11 has a top end 111 and a bottom end 113, wherein the top end 111 is provided with a sink 112, the top end 111 of the nail cap 11 has a first diameter D1, the bottom end 113 of the nail cap 11 has a second diameter D2, wherein the second diameter D2 is greater than the first diameter D1, the bottom end 113 is connected to the top end 111 in an arc, and the top end 111 of the nail cap 11 is a plane. The integrity of the concave cross groove of the nail head after being impacted by the firing pin of the automatic nail gun is ensured, which is convenient for later disassembly.

[0023] The ratio of the depth of the sink groove 112 to the thickness T1 of the nail cap 11 is in the range of 0.5 to 0.8, and the sink groove 112 is a cross groove or a slot. In this embodiment, the sink groove 112 is a cross groove, wherein the depth of the cross groove is 1.6 mm. The ratio of the depth of the cross groove to the thickness T1 of the nail cap 11 is too small, and the fastening force is insufficient when the cross groove is combined with an electric tool; the ratio of the depth of the cross groove to the thickness T1 of the nail cap 11 is too large, and the strength of the nail cap 11 is insufficient, and the automatic nail gun is easy to deform the nail cap 11 when it is hit. The cross groove can also be replaced by a slot.

[0024] like Figure 2 As shown, the plastic connecting belt 20 includes a retaining portion and a connecting portion 23, wherein a plurality of retaining portions are adjacent to each other, and each retaining portion is connected together through the connecting portion 23 to form the plastic connecting belt 20. The retaining portion is thin, annular, has a through hole 25 in the middle, and an edge 211 of the retaining portion has an inclined angle.

[0025] like Figure 3 As shown, the bottom end 113 of the nail cap 11 is downwardly provided with a protrusion 114, which is annular. The height of the protrusion 114 is 0.1 mm, and the inner diameter D3 of the protrusion 114 is 5.6 mm. The diameter D4 of the edge 211 of the retaining portion is smaller than the inner diameter D3 of the protrusion 114, the nail rod 12 passes through the through hole 25, and the nail tip 13 is exposed from the through hole 25.

[0026] When the self-tapping screws 10 are put into the automatic nail gun, the self-tapping screws 10 need to be arranged into a row and loaded into the plastic connecting belt 20, and a row of self-tapping screws 10 are put into the material clip of the automatic nail gun. When the plastic connecting belt 20 is loaded into the automatic nail gun, the connecting portion 23 is cut.

[0027] The holding portion includes a first holding portion 21 and a second holding portion 22 . A through hole 25 is provided in the middle of the first holding portion 21 and the second holding portion 22 . The first holding portion 21 and the second holding portion 22 are connected by a clamping portion 24 , and the clamping portion 24 is communicated with the through hole 25 .

[0028] like Figure 4As shown, the plastic connecting tape 20 is torn off when the self-tapping screw 10 is injected. Since the diameter D4 of the edge 211 of the retaining portion is smaller than the inner diameter D3 of the protrusion 114, the edge 211 with an inclined angle is between the protrusions 114, so that the retaining portion can remain completely between the self-tapping screw 10 and the base 30, increasing the friction between the self-tapping screw 10 and the surface of the base 30, playing a role in preventing loosening and falling off, while avoiding damage to the surface of the base 30.

[0029] There is a transition section 121 between the nail rod 12 and the bottom end 113 of the nail cap 11, wherein the transition section 121 is in an arc shape. The nail tip 13 is in an arc shape, which is more conducive to the self-tapping screw 10 passing through the base 30 when shooting.

[0030] The first diameter D1 is 6 mm, and the second diameter D2 is 6.5 mm. The thickness T1 of the nail cap 11 is 2.5 mm to 2.7 mm. If the height of the nail cap 11 is too large, the surface during tightening will be affected. If the height of the nail cap 11 is too small, the nail cap 11 will be easily deformed when hit.

[0031] The self-tapping screw 10 can be manufactured by cold heading and then rolling the thread and the nail tip, and its own hardness can be improved through heat treatment to achieve its performance.

[0032] The beneficial effects of the utility model are:

[0033] 1. The thickened nail cap 11 is designed, and the top 111 of the nail cap 11 is designed with a large flat head, which ensures the integrity of the concave cross groove or slot of the nail cap 11 after the nail cap 11 is impacted by the firing pin of the automatic nail gun, which is conducive to later disassembly.

[0034] 2. The bottom end 113 of the nail cap 11 is designed as a concave protrusion 114, so that after the retaining portion of the plastic connecting belt 20 is torn off when the self-tapping screw 10 is injected, it can remain intact between the self-tapping screw 10 and the injected substrate 30, so that the concave protrusion 114 plays a role in preventing loosening and falling off.

[0035] 3. The nail tip 13 is designed to be arc-shaped, which is more conducive to passing through the base 30 during shooting.

[0036] In addition to the above embodiments, the present invention may also have other implementations. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.

Claims

1. A self-tapping screw with a plastic connecting strip, characterized in that: include: The self-tapping screw comprises a nail cap and a nail rod connected to the nail cap, and a nail tip at the lower end of the nail rod, wherein the nail rod is provided with a thread, and is characterized in that: the nail cap has a top end and a bottom end, wherein the top end is provided with a sink groove, the top end of the nail cap has a first diameter, the bottom end of the nail cap has a second diameter, wherein the second diameter is greater than the first diameter, the bottom end is connected to the top end in an arc, the top end of the nail cap is a plane, and the bottom end of the nail cap is provided with a protrusion downwards, The plastic connecting belt includes a retaining portion and a connecting portion, wherein a plurality of retaining portions are adjacent to each other, each retaining portion is connected by the connecting portion, a through hole is provided in the middle of the retaining portion, an edge of the retaining portion has an inclined angle, and a diameter of the edge of the retaining portion is smaller than an inner diameter of the protrusion.

2. The self-tapping screw according to claim 1, characterized in that: The ratio of the depth of the countersunk groove to the thickness of the nail cap is in the range of 0.5 to 0.8, and the countersunk groove is a cross groove or a slotted groove.

3. The self-tapping screw according to claim 2, characterized in that: The protrusion is ring-shaped.

4. The self-tapping screw according to claim 3, characterized in that: A transition section is provided between the nail rod and the bottom end of the nail cap, wherein the transition section is in an arc shape.

5. The self-tapping screw according to claim 4, characterized in that: The nail tip is arc-shaped.

6. The self-tapping screw according to claim 5, characterized in that: The first diameter is 6mm, the second diameter is 6.5mm, the thickness of the nail cap is 2.5mm~2.7mm, the height of the protrusion is 0.1mm, and the inner diameter of the protrusion is 5.6mm.

7. The self-tapping screw according to claim 6, characterized in that: The holding part comprises a first holding part and a second holding part, both of which have through holes in the middle, and the first holding part and the second holding part are connected by a clamping part, and the clamping part is communicated with the through hole.

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