TWI865113B - Blind rivet with two-part buckling rivet body and longitudinal restraint rivet mandrel and the construction method thereof - Google Patents

Abstract

The blind rivet of the present invention comprises a rivet mandrel and a rivet body. The main objective of the present invention is to provide a kind of blind rivet to effectively shorten the drawing section of the rivet mandrel through the design of the drawing section of the blind rivet and further reduce the overall length of the rivet mandrel. As a result, the cost of materials can be reduced. The design of the grooving section of the rivet mandrel of the blind rivet makes the grip of the blind rivet stronger after riveting and effectively increases the safety of applications thereof. The present invention has a design wherein the shank of the rivet body is drilled separately by a guide hole of diameter Ø and Ø/2 at the position of 0.6L and 0.7L respectively. While using the rivet body and the blind rivet to be paired with, the rivet body can be one single form to serve objects of different plate thickness that need to be fastened; reduce the fracture toughness of the rivet body through the aforementioned two guide holes; generate buckling strain easily while fastening the object at the spot.

Description

Pull-on rivet with two-stage buckling rivet body and longitudinally restrained rivet core and construction method thereof

The present invention relates to a pull nail; more specifically, it particularly relates to a pull nail with a two-stage buckling rivet body and a longitudinally restrained nail core and a construction method thereof.

The core of the known pull nail has a relatively long core length. This is because the holding force of the drawing section of the known nail core used for drawing is insufficient. Therefore, in order to ensure sufficient holding force, the length of the drawing section needs to be increased, resulting in a relatively long core length of the known nail core, which leads to a higher manufacturing cost.

It is known that the core of the bolt has insufficient holding force in the slotted section after being pulled. When the object to be locked generates an axial force at the same level as the bolt, the core of the bolt and the rivet body may loosen due to the insufficient holding force in the slotted section after being pulled, which may affect the safety of the application.

The rivet of the known rivet cannot be applied to various plate thicknesses to be fastened, because the principle of the buckling point was not considered at the beginning of the design of the known rivet, so the buckling point of the known rivet is not variable, resulting in the failure to make the buckling strain at the appropriate position according to the thickness of the plate to be fastened when the known rivet is applied to various plate thicknesses to be fastened.

In view of this, the creator of this case conducted an in-depth discussion on the aforementioned deficiencies based on his many years of research and development experience in related fields, and actively sought solutions based on the aforementioned needs. After a long period of hard research and multiple tests, this creation was finally completed.

The main purpose of the present invention is to provide a pull nail, so that when the rivet body of the pull nail is constructed on the object to be locked, the rivet body design of the present invention can be used for the objects to be locked with various plate thicknesses to make the buckling strain at the appropriate position according to the plate thickness of the object to be locked; and through the design of the slotted section of the nail core of the pull nail, the holding force of the pull nail after drawing can be effectively increased, and the safety in application can be further improved; and through the design of the drawing section of the nail core of the pull nail, the length of the drawing section of the nail core can be effectively shortened, thereby shortening the overall nail core length, so that the material cost can be reduced.

To achieve the above-mentioned purpose, the present invention nail core 10 is improved over the conventional nail core 10' in that: the drawing section 1012 of the present invention nail core 10 has a radial convex annular structure 10120, and a staggered axial straight groove 10121 is provided on the radial convex annular structure 10120, and the staggered axial straight groove 10121 can increase the holding force during drawing, so that the entire nail core 10 is longer. The shortening can effectively reduce the manufacturing cost. For example, the length of the drawing section of the conventional nail core 10' is L', and the shortening length of the drawing section of the conventional nail core 10 can be 0.01L'~0.10L'. Compared with the length of the drawing section of the conventional nail core 10' being L', the length of the drawing section 1012 of the nail core 10 after shortening can be L''.

The rivet 11 of the present invention is improved over the conventional rivet 11' in that: the rivet 11 of the present invention is provided with a hole which penetrates the rivet and can be engaged with the rivet core, a rivet head 110, and a rivet body 111. The rivet body length L of the rivet body 111 is the column equivalent length according to the Euler long rod formula, and its value depends on the support conditions on both sides of the column: if both ends are fixed and cannot rotate, L= 0.50; if one end is fixed and the other end is only connected with a pin, L≈ 0.7; at this time, the buckling point of the rivet body 111 will fall on the long rod when the axial stress is applied, and the strain will start to be generated from 0.5L~0.7L of the rivet body length L. Therefore, the present invention will drill a 0.6L diameter Ø guide hole and a 0.7L diameter Ø/2 guide hole at 0.6L and 0.7L of the rivet body 11, respectively. In this way, when the pull nail 1 used with the rivet body 11 can be applied to the objects 2 to be locked with different plate thicknesses by a single form of rivet body 11, the destructive toughness of the rivet body 111 can be reduced through the above three guide holes to make it easy to generate buckling strain, and the most appropriate buckling strain can be made with the assistance of the guide hole to fix the object 2 to be locked.

The rivet 1 of the present invention comprises a rivet core 10 and a rivet body 11;

The nail core 10 of the present invention is composed of a nail head 100 and a nail rod 101 . The nail rod can be divided into a fastening section 1010 , a slotting section 1011 , and a drawing section 1012 .

The fastening section 1010 is the nail rod 101 close to the nail head 100, and the diameter of the fastening section 1010 is d-0, and the diameter of the nail head 100 is d'-0.

The slotted section 1011 is disposed on the nail rod 101 connecting the fastening section 1010, and the diameter of the slotted section 1011 can be d-d/8~d-d/16. The slotted section 1011 is respectively provided with a staggered radial annular slotted portion 10120 and an axial linear slotted structure 10121.

The above-mentioned staggered radial annular groove portion 10120 is a radial annular groove with an interval of 90°, and the depth of the annular groove can be d/48~d/32.

The above-mentioned axial straight slot structure 10121 is a straight slot structure with four lines spaced 90 degrees apart, and the depth of the straight slot structure can be d/48~d/32.

The above-mentioned drawing section 1012 is arranged on the nail rod 101 connected to the slotted section 1011, and the drawing section 1012 has a radial convex annular structure 10120, and a staggered axial straight slot portion 10121 is arranged on the radial convex annular structure 10120, and the staggered axial straight slot portion 10121 can increase the gripping force during drawing, so that the drawing section of the nail core 10 can shorten the length of the drawing section 1012 under the premise of unchanged gripping force, so that the length of the entire nail core 10 is shortened, and the manufacturing cost is effectively reduced.

The rivet body 11 of the present invention is composed of a hole that penetrates the rivet body and can be engaged with the rivet core, a rivet head 110, and a rivet body 111.

The screw body 111 described above has a screw body length L as the column equivalent length according to the Euler long rod formula, and its value depends on the support conditions on both sides of the column: if both ends are fixed and cannot rotate, L= 0.50; if one end is fixed and the other end is only connected by a pin, L≈ 0.7; at this time, the buckling point of the screw body 111 will fall on the long rod, and when the axial stress is applied, the strain will begin to be generated from 0.5L~0.7L of the screw body length L. Therefore, the present invention will drill a guide hole 11116 with a diameter of Ø at 0.6L and a guide hole 11117 at 0.7L at 0.6L and 0.7L of the screw body 111 of the screw body 11, respectively. The guide hole has a diameter of Ø/2. In this way, when the pull nail 1 used with the rivet body 11 is applied to the objects 2 to be fixed with different plate thicknesses, the destructive toughness of the rivet body 111 can be reduced through the three guide holes mentioned above, making it easier to produce buckling strain. With the assistance of the guide hole, the most appropriate buckling strain can be made to fix the object 2 to be fixed.

The above-mentioned 0.6L guide hole 11116, which has a diameter of Ø, is drilled at 0.6L of the rivet length L of the rivet body 111. Therefore, the 0.6L guide hole 11116 is applicable to the object 2 to be fixed whose thickness is less than 0.6L of the rivet length L.

The above-mentioned 0.7L guide hole 11117 has a diameter of Ø/2. Since it is drilled at 0.7L of the rivet length L of the rivet body 111, the 0.7L guide hole 11117 is applicable to the object 2 to be fixed whose thickness is less than 0.7L of the rivet length L.

The construction method of the pull nail is completed through the following steps:

The drilling step A. of the present invention can drill holes with a diameter d'+d'/16 slightly larger than the diameter d'-0 of the nail core 10 and the diameter d'-1 of the rivet body 11 on the objects to be fixed 2 with a thickness of 0.5L and 0.6L respectively.

The pre-assembly step B of the present invention is to insert the nail core 10 from the nail rod 101 end into the rivet body 111 end of the rivet body 11 to form the pull nail 1 of the present invention.

The installation step C of the present invention is to insert the pre-assembled pull nail 1 into the hole pre-drilled in the drilling step A. of the object 2 to be fastened.

The fixing step D. of the present invention is to insert the aforementioned pull nail 1 of the present invention into the hole of the plate 2 to be locked with a thickness of 0.5L or 0.6L pre-drilled in the drilling step A., and the pull nail 1 applies an axial force to the object 2 to be locked by the rivet head 110 of the rivet body 11, and at the same time, the drawing section 1012 of the rivet core 10 applies a force in the opposite direction to the rivet body 11, so that the rivet body 111 of the rivet body 11 is changed from the rivet body length L described by the Euler long rod formula to the column equivalent length, and its value depends on the support conditions on both sides of the column: if both ends are fixed and cannot rotate, L= 0.50; if one end is fixed and the other end is only connected with a pin, L≈ 0.7; at this time, the bending point of the screw body 111 will fall at 0.5L~0.7L to generate strain, and the screw body 111 of the screw body 11 is pre-drilled at 0.6L and 0.7L respectively with a Ø guide hole at 0.6L and a Ø/2 guide hole at 0.7L, and the guide holes 1111 at 0.6L are respectively set. 6. The guide hole 11117 at 0.7L, and according to the above-mentioned Euler rod formula, the pull nail 1 of the present invention can be applied to the objects 2 to be locked with different plate thicknesses by using a single type of rivet body 11. The rivet body 111 can be subjected to the most appropriate buckling strain through the three types of guide holes due to the material properties and the assistance of the guide holes to fix the objects to be locked.

In summary, the advantages of the present invention are:

1. The overall nail core length is shortened, which effectively reduces the manufacturing cost: The drawing section 1012 of the nail core 10 of the present invention has a structure with four-wire spiral grooves 10120, and because the four-wire spiral grooves 10120 structure can increase the gripping force during drawing, the drawing section 1012 of the nail core 10 can be shortened under the premise of keeping the gripping force unchanged, so that the length of the entire nail core 10 is shortened to effectively reduce the manufacturing cost. For example, the length of the drawing section of the known nail core 10' is L', and the shortened length of the drawing section of the present invention can be 0.01L'~0.10L' compared to the known nail core 10'. Compared with the length of the drawing section of the known nail core 10' is L', the length of the shortened drawing section 1012 of the nail core 10 of the present invention can be L''.

2. The slotted section structure of the nail core of the present invention is used to effectively increase the holding force of the bolt after drawing: the slotted section 1011 of the nail core 10 of the present invention needs to be deformed inward by the rivet body 11 after drawing, so that the structure formed by the staggered radial annular slotted portion 10111 and the axial linear slotted structure 10112 is embedded with the rivet body 11 to increase the holding force after drawing.

3. The draw nail used with the rivet of the present invention can be applied to various plate thicknesses to be locked: the rivet body 111 of the rivet body 11 of the present invention is based on the rivet body length L described in the Euler rod formula as the column equivalent length, and its value depends on the support conditions on both sides of the column: if both ends are fixed and cannot rotate, L= 0.5; if one end is fixed and the other end is only connected with a pin, L≈ 0.7; at this time, the bending point of the screw body 111 will fall at 0.5L~0.7L to generate strain, and the screw body 111 of the screw body 11 is pre-drilled at 0.6L and 0.7L respectively with a Ø guide hole at 0.6L and a Ø/2 guide hole at 0.7L, and the guide hole 111 at 0.6L is set 16. The guide hole 11117 at 0.7L. The pull nail 1 of the present invention can be applied to the objects 2 to be fixed with different plate thicknesses by using a single type of rivet body 11. The three types of guide holes mentioned above can reduce the destructive toughness of the rivet body 111 so that it is easy to produce buckling strain. With the assistance of the guide hole, the most appropriate buckling strain can be made to fix the object to be fixed.

In order to provide a more detailed understanding of the purpose, function, features and structure of the present invention, preferred embodiments are described below with reference to the accompanying drawings.

First, please refer to FIG. 1 , which is a schematic diagram comparing the nail core 10 of the present invention with the conventional nail core 10 ′.

As shown in FIG. 1 , the present invention nail core 10 is improved over the conventional nail core 10′ in that the drawing section 1012 of the present invention nail core 10 has a radial convex annular structure 10120, and a staggered axial straight slot 10121 is provided on the radial convex annular structure 10120, and the staggered axial straight slot 10121 can increase the drawing force. The holding force during pulling shortens the length of the entire nail core 10, thereby effectively reducing the manufacturing cost. For example, the length of the pulling section of the conventional nail core 10' is L', and the length of the pulling section of the conventional nail core 10 can be shortened by 0.01L'~0.10L'. Compared with the length of the pulling section of the conventional nail core 10' being L', the length of the pulling section 1012 of the shortened nail core 10 of the present invention can be L''.

Please refer to FIG. 2 , which is a schematic diagram comparing the rivet 11 of the present invention and the conventional rivet 11 ′.

As shown in FIG. 2 , the rivet 11 of the present invention is improved from the conventional rivet 11′ in that: the rivet 11 of the present invention is provided with a hole which penetrates the rivet and can be engaged with the rivet core, a rivet head 110, and a rivet body 111, and the rivet body length L of the rivet body 111 is the column equivalent length according to the Euler long rod formula, and its value depends on the support conditions on both sides of the column: if both ends are fixed and cannot rotate, L= 0.50; if one end is fixed and the other end is only connected with a pin, L≈ 0.7; at this time, the buckling point of the rivet body 111 will fall on the long rod when the axial stress is applied, and the strain will start to be generated from 0.5L~0.7L of the rivet body length L. Therefore, the present invention will drill a 0.6L diameter Ø guide hole and a 0.7L diameter Ø/2 guide hole at 0.6L and 0.7L of the rivet body 11, respectively. In this way, when the pull nail 1 used in conjunction with the rivet body 11 can be used for 2 objects to be locked with different plate thicknesses by using a single type of rivet body 11, the destructive toughness of the rivet body 111 can be reduced through the above three guide holes to make it easy to generate buckling strain, and the most appropriate buckling strain can be made with the assistance of the guide hole to fix the object 2 to be locked.

Please refer to FIG. 3 , which is a schematic diagram of the nail core 10 of the present invention.

As shown in FIG. 3 , the nail core 10 of the present invention is composed of a nail head 100 and a nail rod 101 . The nail rod can be divided into a fastening section 1010 , a slotting section 1011 , and a drawing section 1012 .

The fastening section 1010 is the nail rod 101 close to the nail head 100, and the diameter of the fastening section 1010 is d-0, and the diameter of the nail head 100 is d'-0.

The slotted section 1011 is disposed on the nail rod 101 connecting the fastening section 1010, and the diameter of the slotted section 1011 can be d-d/8~d-d/16. The slotted section 1011 is respectively provided with a staggered radial annular slotted portion 10120 and an axial linear slotted structure 10121.

The above-mentioned staggered radial annular groove portion 10120 is a radial annular groove with an interval of 90°, and the depth of the annular groove can be d/48~d/32.

The above-mentioned axial straight slot structure 10121 is a straight slot structure with four lines spaced 90 degrees apart, and the depth of the straight slot structure can be d/48~d/32.

The above-mentioned drawing section 1012 is arranged on the nail rod 101 connected to the slotted section 1011, and the drawing section 1012 has a radial convex annular structure 10120, and a staggered axial straight slot portion 10121 is arranged on the radial convex annular structure 10120, and the staggered axial straight slot portion 10121 can increase the gripping force during drawing, so that the drawing section of the nail core 10 can shorten the length of the drawing section 1012 under the premise of unchanged gripping force, so that the length of the entire nail core 10 is shortened, and the manufacturing cost is effectively reduced.

Please refer to FIG. 4 , which is a schematic diagram of the rivet body 11 of the present invention.

As shown in FIG. 4 , the rivet body 11 of the present invention is composed of a hole that penetrates the rivet body and can be engaged with the rivet core, a rivet head 110 , and a rivet body 111 .

The screw body 111 described above has a screw body length L as the column equivalent length according to the Euler long rod formula, and its value depends on the support conditions on both sides of the column: if both ends are fixed and cannot rotate, L= 0.50; if one end is fixed and the other end is only connected by a pin, L≈ 0.7; at this time, the buckling point of the screw body 111 will fall on the long rod, and when the axial stress is applied, the strain will begin to be generated from 0.5L~0.7L of the screw body length L. Therefore, the present invention will drill a guide hole 11116 with a diameter of Ø at 0.6L and a guide hole 11117 at 0.7L at 0.6L and 0.7L of the screw body 111 of the screw body 11, respectively. The guide hole has a diameter of Ø/2. In this way, when the pull nail 1 used with the rivet body 11 is applied to the objects 2 to be fixed with different plate thicknesses, the destructive toughness of the rivet body 111 can be reduced through the three guide holes mentioned above, making it easier to produce buckling strain. With the assistance of the guide hole, the most appropriate buckling strain can be made to fix the object 2 to be fixed.

The above-mentioned 0.6L guide hole 11116, which has a diameter of Ø, is drilled at 0.6L of the rivet length L of the rivet body 111. Therefore, the 0.6L guide hole 11116 is applicable to the object 2 to be fixed whose thickness is less than 0.6L of the rivet length L.

The above-mentioned 0.7L guide hole 11117 has a diameter of Ø/2. Since it is drilled at 0.7L of the rivet length L of the rivet body 111, the 0.7L guide hole 11117 is applicable to the object 2 to be fixed whose thickness is less than 0.7L of the rivet length L.

Please refer to FIG. 5 , which is a schematic diagram of the drilling step A of the present invention.

As shown in FIG. 5 , the drilling step A. of the present invention can drill holes with a diameter d'+d'/16 slightly larger than the diameter d'-0 of the nail core 10 and the diameter d'-1 of the rivet body 11 on the objects 2 to be fixed with a thickness of 0.5L and 0.6L, respectively.

Please refer to FIG. 6 , which is a schematic diagram of the pre-assembly step B. of the present invention.

As shown in FIG6 , the rivet 1 of the present invention comprises a rivet core 10 and a rivet body 11;

As shown in FIG. 6 , the pre-assembly step B of the present invention is to insert the nail core 10 from the nail rod 101 end into the rivet body 111 end of the rivet body 11 to form the pull nail 1 of the present invention.

Please refer to Figure 7, which is a schematic diagram of the installation step C. of the present invention.

As shown in FIG. 7 , the installation step C of the present invention is to insert the pre-assembled pull pin 1 into the hole pre-drilled in the object 2 to be fastened in the drilling step A.

Please refer to FIG. 8 , which is a schematic diagram of the first preferred embodiment of the fixed step D. of the present invention.

As shown in FIG8 , the first preferred embodiment of the fixing step D. of the present invention is to insert the aforementioned pull nail 1 of the present invention into the hole pre-drilled in the 0.5L thick plate of the object 2 to be locked by the drilling step A., and apply an axial force to the object 2 to be locked by the pull nail 1, and apply a force in the opposite direction to the rivet 11 by the drawing section 1012 of the rivet core 10, so that the rivet body 111 of the rivet body 11 is changed from the rivet body length L described by the Euler long rod formula to the column equivalent length, and its value depends on the support conditions on both sides of the column: if both ends are fixed and cannot rotate, L= 0.50; if one end is fixed and the other end is only connected by a pin, L≈0.7; at this time, the buckling point of the rivet body 111 will fall at 0.5L~0.7L to generate strain, and a guide hole with a diameter of Ø is pre-drilled at 0.6L through the rivet body 111 of the rivet body 11. Through the guide hole 11116 at 0.6L and according to the above-mentioned Euler long rod formula, the rivet body 111 of the rivet body 11 will start to generate buckling strain from the guide hole with a diameter of Ø pre-drilled at 0.6L, and the object 2 to be locked with a thickness of ≤0.5L can be fixed in the bolt 1 until the object 2 to be locked is fixed.

Please refer to FIG. 9 and FIG. 10 , FIG. 9 is a schematic diagram showing the completion of the first preferred embodiment of the present invention in fixed step D., and FIG. 10 is a three-dimensional schematic diagram showing the completion of the first preferred embodiment of the present invention in fixed step D.

As shown in FIG. 9 and FIG. 10 , the pull pin 1 of the present invention can be applied to fix the 0.5L thickness plate of the aforementioned first preferred embodiment.

The application of the first preferred embodiment is that the rivet 111 of the rivet 11 of the present invention is based on the rivet length L described in the Euler rod formula as the column equivalent length, and its value depends on the support conditions on both sides of the column: if both ends are fixed and cannot rotate, L= 0.5; if one end is fixed and the other end is only connected with a pin, L≈ 0.7; at this time, the buckling point of the rivet body 111 will fall at 0.5L~0.7L to generate strain, and a guide hole with a diameter of Ø is drilled at 0.6L in advance through the rivet body 111 of the rivet body 11, and through the guide hole 11116 set at 0.6L, the pull nail 1 of the present invention can be used by a single type of rivet body 11 for the object 2 to be locked with different plate thicknesses. The rivet body 111 can be used through the guide hole to make the most appropriate buckling strain with the help of material properties and the guide hole to fix the object to be locked.

Please refer to FIG. 11 , which is a schematic diagram of the second preferred embodiment of the fixed step D. of the present invention.

As shown in FIG. 11 , the second preferred embodiment of the fixing step D. of the present invention is to insert the aforementioned pull nail 1 of the present invention into the hole pre-drilled in the 0.6L thick plate of the object 2 to be locked by the drilling step A., and apply an axial force to the object 2 to be locked by the pull nail 1, and apply a force in the opposite direction to the rivet 11 by the drawing section 1012 of the rivet core 10, so that the rivet body 111 of the rivet body 11 is changed from the rivet body length L described by the Euler long rod formula to the column equivalent length, and its value depends on the support conditions on both sides of the column: if both ends are fixed and cannot rotate, L= 0.5; if one end is fixed and the other end is only connected with a pin, L≈0.7; at this time, the buckling point of the rivet body 111 will fall at 0.5L~0.7L to generate strain, and a guide hole with a diameter of Ø/2 is pre-drilled at 0.7L through the rivet body 111 of the rivet body 11. Through the guide hole 11117 at 0.7L and according to the above-mentioned Euler long rod formula, the rivet body 111 of the rivet body 11 will start to generate buckling strain from the guide hole with a diameter of Ø/2 pre-drilled at 0.7L, and the object 2 to be locked with a thickness of ≤0.6L can be fixed in the bolt 1 until the object 2 to be locked is fixed.

Please refer to FIG. 12 and FIG. 13 , FIG. 12 is a schematic diagram showing the completion of the second preferred embodiment of the present invention in fixed step D., and FIG. 13 is a three-dimensional schematic diagram showing the completion of the second preferred embodiment of the present invention in fixed step D.

As shown in FIG. 12 and FIG. 13 , the pull pin 1 of the present invention can be applied to fix the 0.6L thickness plate of the aforementioned first preferred embodiment.

The application of the first preferred embodiment is that the rivet 111 of the rivet 11 of the present invention is based on the rivet length L described in the Euler rod formula as the column equivalent length, and its value depends on the support conditions on both sides of the column: if both ends are fixed and cannot rotate, L= 0.5; if one end is fixed and the other end is only connected with a pin, L≈ 0.7; at this time, the buckling point of the rivet body 111 will fall at 0.5L~0.7L to generate strain, and a guide hole with a diameter of Ø/2 is drilled at 0.7L in advance through the rivet body 111 of the rivet body 11, and through the guide hole 11117 set at 0.7L, the pull nail 1 of the present invention can be used by a single type of rivet body 11 for the object 2 to be locked with different plate thicknesses. The rivet body 111 can be used through the guide hole to make the most appropriate buckling strain with the help of material properties and the guide hole to fix the object to be locked.

In summary, the advantages of the present invention are:

1. The overall nail core length is shortened, which effectively reduces the manufacturing cost: The drawing section 1012 of the nail core 10 of the present invention has a radial convex annular structure 10120, and a staggered axial straight groove portion 10121 is provided on the radial convex annular structure 10120. The staggered axial straight groove portion 10121 can increase the holding force during drawing, so that the overall nail core 10 is shortened. The shortening can effectively reduce the manufacturing cost. For example, the length of the drawing section of the conventional nail core 10' is L', and the shortening length of the drawing section of the conventional nail core 10 can be 0.01L'~0.10L'. Compared with the length of the drawing section of the conventional nail core 10' being L', the length of the drawing section 1012 of the nail core 10 after shortening can be L''.

2. The slotted section structure of the nail core of the present invention is used to effectively increase the holding force of the bolt after drawing: the slotted section 1011 of the nail core 10 of the present invention needs to be deformed inward by the rivet body 11 after drawing, so that the structure formed by the staggered radial annular slotted portion 10111 and the axial linear slotted structure 10112 is embedded with the rivet body 11 to increase the holding force after drawing.

3. The draw nail used with the rivet of the present invention can be applied to various plate thicknesses to be locked: the rivet body 111 of the rivet body 11 of the present invention is based on the rivet body length L described in the Euler rod formula as the column equivalent length, and its value depends on the support conditions on both sides of the column: if both ends are fixed and cannot rotate, L= 0.5; if one end is fixed and the other end is only connected with a pin, L≈ 0.7; at this time, the bending point of the screw body 111 will fall at 0.5L~0.7L to generate strain, and the screw body 111 of the screw body 11 is pre-drilled at 0.6L and 0.7L respectively with a Ø guide hole at 0.6L and a Ø/2 guide hole at 0.7L, and the guide hole 111 at 0.6L is set 16. The guide hole 11117 at 0.7L. The pull nail 1 of the present invention can be applied to the objects 2 to be fixed with different plate thicknesses by using a single type of rivet body 11. The three types of guide holes mentioned above can reduce the destructive toughness of the rivet body 111 so that it is easy to produce buckling strain. With the assistance of the guide hole, the most appropriate buckling strain can be made to fix the object to be fixed.

Therefore, this invention has excellent progress and practicality among similar products. At the same time, after searching domestic and foreign technical data and literature on this type of structure, it is indeed found that there is no identical or similar structure existing before the application of this case. Therefore, this case should have met the patent requirements of "creativity", "suitability for industrial application" and "progress", and the application is filed in accordance with the law.

However, the above-mentioned are only the preferred embodiments of the present invention. Any other equivalent structural changes made by applying the present invention specification and the scope of the patent application should be included in the scope of the patent application of the present invention.

1: Pulling nail 10: Nail core 10': Known nail core 100: Nail head d'-0: Nail head diameter 101: Nail rod 1010: Tie section d-0: Tie section diameter 1011: Slot section 10111: Staggered radial annular slotting section 10112: Axial straight slotting structure 1012: Drawing section 10120: Radial convex annular structure 10121: Staggered axial straight slotting section 11: Rivet body d-1: Rivet body hole diameter 11': Known rivet body 110: Rivet head 111: Rivet body d'-1: Rivet body diameter L: Rivet body length 1110: Locking section 1111: Buckling section 0.6L: First buckling point 11116: Guide hole at 0.6L Ø: Guide hole diameter at 0.6L 0.7L: Second buckling point 11117: Guide hole at 0.7L Ø/2: Guide hole diameter at 0.7L L': Length of the conventional drawing section of the nail core L": Length of the drawing section after the nail core of the present invention is shortened 0.01L'~0.10L': Shortened length of the drawing section of the nail core of the present invention compared with the conventional nail core 2: Object to be locked A.: Drilling step B.: Pre-assembly step C.: Installation step D.: Fixing step d'+d'/16: Drilling hole diameter

FIG1 : A schematic diagram comparing the nail core 10 of the present invention and the conventional nail core 10 ′;

FIG2 : A schematic diagram comparing the rivet 11 of the present invention and the conventional rivet 11 ′;

Figure 3: Schematic diagram of the nail core 10 of the present invention;

Figure 4: Schematic diagram of the riveting body 11 of the present invention;

Figure 5: Schematic diagram of the drilling step A of the present invention;

Figure 6: Schematic diagram of the pre-assembly step B of the present invention;

Figure 7: Schematic diagram of the installation step C. of the present invention;

FIG8 : A schematic diagram of the first preferred embodiment of the fixed step D. of the present invention;

Figure 9: Schematic diagram of the first preferred embodiment of the present invention, fixed step D. completed;

FIG10 : A three-dimensional schematic diagram of the fixing step D. of the first preferred embodiment of the present invention;

FIG11 : A schematic diagram of the second preferred embodiment of the fixing step D. of the present invention;

FIG. 12 : A schematic diagram showing the completion of the second preferred embodiment of the present invention in fixed step D.;

FIG13 : A three-dimensional schematic diagram of the second preferred embodiment of the present invention after the fixing step D. is completed;

B.: Pre-assembly steps

1: Pin

2: Objects to be locked

10: Nail core

100: Nail head

d'-0: nail head diameter

101: Nail

1010:Bundle fixing section

d-0: Diameter of the binding section

11: Rivet body

d-1: Rivet hole diameter

111: Rivet

d'-1: Drill body diameter

L: Rivet length

0.6L: First bending point

0.7L: Second bending point

Claims (4)

A pull nail includes a nail core and a rivet body; The nail core is composed of a nail head and a nail rod, and the nail rod can be divided into a fastening section, a slotting section, and a drawing section; The fastening section is the nail rod close to the nail head, and the diameter of the fastening section is d-0, and the diameter of the nail head is d'-0; The slotting section is arranged on the nail rod connected to the fastening section, and the diameter of the slotting section can be d-d/8~d-d/16, and the slotting section is respectively provided with a staggered radial annular slotting portion and an axial linear slotting structure; The above-mentioned staggered radial annular groove is a radial annular groove with an interval of 90°, and the depth of the annular groove can be d/48~d/32; The above-mentioned axial straight groove structure is a straight groove structure with four lines spaced 90° apart, and the depth of the straight groove structure can be d/48~d/32; The above-mentioned drawing section is arranged on the nail rod connected to the slotted section, and the drawing section has a radial convex annular structure, and a staggered axial straight slot is arranged on the radial convex annular structure, and the staggered axial straight slot can increase the holding force during drawing, so that the drawing section of the nail core can be shortened under the premise of unchanged holding force, so that the overall nail core length is shortened to effectively reduce the manufacturing cost. For example, the length of the drawing section of the known nail core is L', and the shortened length of the drawing section of the nail core of the present invention can be 0.01L'~0.10L' compared with the known nail core; The rivet body is composed of a hole that penetrates it and can be engaged with the rivet core, a rivet head, and a rivet body. A construction method using the pull nail described in claim 1 is completed through the following steps: A. Drilling step: drilling a hole with a hole diameter d'+d'/16 slightly larger than the diameter of the nail core, the nail head, and the rivet body on the object to be locked; B. Pre-assembly step: inserting the nail core from the end of the nail rod into the end of the rivet body to form the pull nail of the present invention; C. Installation step: inserting the above-mentioned pre-assembled pull nail into the hole pre-drilled in the drilling step; D. Fixing step: insert the above-mentioned rivet into the hole pre-drilled in the drilling step, apply axial force to the object to be locked on the rivet head of the rivet body, and at the same time apply force in the opposite direction to the rivet body on the drawing section of the rivet core, so that the rivet body of the rivet body produces strain to fix the object to be locked. A pull nail includes a nail core and a rivet body; The nail core is composed of a nail head and a nail rod, and the nail rod can be divided into a fastening section, a slotting section, and a drawing section; The fastening section is the nail rod close to the nail head, and the diameter of the fastening section is d-0, and the diameter of the nail head is d'-0; The slotting section is arranged on the nail rod connected to the fastening section, and the diameter of the slotting section can be d-d/8~d-d/16, and the slotting section is respectively provided with a staggered radial annular slotting portion and an axial linear slotting structure; The above-mentioned staggered radial annular groove is a radial annular groove with an interval of 90°, and the depth of the annular groove can be d/48~d/32; The above-mentioned axial straight line groove structure is a four-line straight line groove structure with an interval of 90°, and the depth of the straight line groove structure can be d/48~d/32; The above-mentioned drawing section is arranged on the nail rod connected to the slotted section, and the drawing section has a radial convex annular structure, and a staggered axial straight slot is arranged on the radial convex annular structure, and the staggered axial straight slot can increase the holding force, so that the drawing section of the nail core can be shortened under the premise of unchanged holding force, so that the overall nail core length is shortened to effectively reduce the manufacturing cost. For example, the length of the drawing section of the known nail core is L', and the shortened length of the drawing section of the nail core of the present invention can be 0.01L'~0.10L' compared with the known nail core; The rivet body is provided with a hole which penetrates the rivet body and can be engaged with the rivet core, a rivet head, and a rivet body. A guide hole with a diameter of Ø at 0.6L and a guide hole with a diameter of Ø/2 at 0.7L are drilled through the rivet body at 0.6L and 0.7L respectively. Through the guide holes at 0.6L and 0.7L respectively provided, the buckling point of the rivet body will fall at 0.6L~0. 7L begins to produce strain, so the present invention will make adaptive buckling strain when fixing through the guide holes drilled at 0.6L and 0.7L of the rivet body. In this way, when the pull nail used with the rivet body is used for objects to be fixed with different plate thicknesses, the three guide holes mentioned above can reduce the destructive toughness of the rivet body to make it easier to produce buckling strain, and with the help of the guide holes, the most appropriate buckling strain can be made to fix the object to be fixed. A construction method using the pull nail described in claim 3 is completed through the following steps: A. Drilling step: drilling a hole with a diameter d'+d'/16 slightly larger than the diameter of the nail core, the nail head, and the rivet body on the object to be locked; B. Pre-assembly step: inserting the nail core from the end of the nail rod into the end of the rivet body to form the pull nail of the present invention; C. Installation step: inserting the above-mentioned pre-assembled pull nail into the hole pre-drilled in the drilling step; D. Fixing step: insert the above-mentioned rivet into the hole pre-drilled in the drilling step, apply axial force to the object to be locked on the rivet head of the rivet body, and apply force in the opposite direction to the rivet body on the drawing section of the rivet core, and pre-drill a 0.6L guide hole with a diameter of Ø and a 0.7L guide hole with a diameter of Ø/2 through the rivet body at 0.6L and 0.7L respectively, and through the above-mentioned 0.6L guide hole and 0.7L guide hole, the buckling point of the rivet body will fall on the long rod when the axial stress is applied, which will be 0.6 of the rivet body length L. Strain begins to occur from L to 0.7L, and a 0.6L diameter Ø guide hole and a 0.7L diameter Ø/2 guide hole are drilled through the rivet body at 0.6L and 0.7L respectively. When fixing objects to be fixed with different plate thicknesses, the above three guide holes can reduce the destructive toughness of the rivet body to make it easier to produce buckling strain. With the help of the guide holes, the most appropriate buckling strain is applied until the object to be fixed is fixed.