TW202331112A - Improved structure of board-to-board fixing device capable of ensuring that the head part of the pull rod is not broken in the pulling process - Google Patents

Abstract

The present invention provides an improved structure of board-to-board fixing device, which includes: a casing pipe having a pipe body defined therein with a through hole, wherein the top side of the pipe body is provided with a first deformation part, the bottom side of the pipe body is provided with a stop part, and the stop part is provided therein with an abutting space in communication with the through hole; and a pull rod having a head part, wherein a steel buffer groove is recessed on the top side of the head part, the bottom side of the head part is provided with a first abutment surface, the bottom side of the first abutment surface is provided with a second deformation part that can be squeezed on the top side of a preset nail gun sleeve in the abutment space, the outer edge of the bottom side of the second deformation part is further provided with a material-increasing protrusion extending downward, the center of the bottom of the second deformation part has a disconnected part with a smaller diameter, and the disconnected part extends to the bottom to form a rod penetrating into the through hole and the abutting space through the first deformation part of the casing pipe.

Description

Structural improvement of board-to-board fixture

The present invention relates to a structural improvement of a board-to-board fixing device, especially to a first abutting surface on the pull rod that hits the upper edge of the casing when the pull rod is pulled by a preset nail pull gun. , so that a first deformed part on the pipe body is deformed, and the pull rod is not easy to rotate in the first deformed part and will not counteract the pull-down force. At the same time, a second deformed part on the pull rod is Deformation will occur in the pipe body, and a rigid buffer groove recessed on the top side of the head of the pull rod can reduce the rigidity of the head to ensure that the head of the pull rod will not be deformed during the pulling process. breakage situation.

According to the current methods of combining and fixing plates, there are screw locking, bonding, welding, rivet or rivet fixing, etc., and the rivet is pulled by a rivet gun to pull the rivet. The rivets in the two panels are deformed to fix the two panels by riveting, and the rivet gun will pull out the rod body in the rivets after riveting and fixing, so as to complete the action of combining and fixing the two panels.

However, a pull rod and a sleeve are provided in the traditionally used pull stud structure, and the pull rod has a T-shaped head, and a rod body extends on one side of the head, and the sleeve is It has a tube body with a hollow interior, and a ring-shaped stop part protrudes from one side of the tube body. In order to assemble the pull nail, the rod body of the pull rod can be passed through the tube body part, and make the head of the pull rod against the upper edge of the pipe body, the assembly can be completed, and the use of the pull rivet By assembling the assembled rivets in a rivet gun, and riveting and fixing the pre-assembled two pre-assembled plates through the rivet gun, the head of the tie rod will pass through the two plates before , through the pulling force of the nail gun, the head is squeezed into the tube body, and then the tube body is squeezed and deformed to rivet and fix the two preset plates, and the pull rod is pulled out of the tube outside the casing to complete the riveting and fixing of the two preset plates.

However, because the head of the pull rivet is T-shaped, it is parallel to the upper edge of the tube body of the sleeve, so that the head will rotate during the pulling process, and Offset part of the pull-down force, and the T-shaped head structure is too thin, it is easy to break in advance and break away from the rod body during the pulling process, and the pull nail gun is pulled with a force of 1500 Newtons During the pulling process, because the rigidity of the head of the pull rod is too strong and not easy to deform and twist, it will break under the pull of the 1500 Newton force, which will cause the riveting of the two preset plates to loosen, and then Affect the construction quality of riveting fixation.

Therefore, how to try to solve the lack and inconvenience of the above-mentioned common use is the key point to be studied and improved urgently by those who are engaged in this industry.

Therefore, in view of the above-mentioned problems and deficiencies, the inventor collected relevant information, evaluated and considered in many ways, and based on years of experience accumulated in this industry, after continuous trial and modification, he designed this board-to-board fixing device. The invention patent for device structure improvement was born.

The present invention mainly relates to a structural improvement of a board-to-board fixing device, which includes: a sleeve, which includes a pipe body with a perforation inside, and the top side of the pipe body has a first deformation portion, and the bottom of the pipe body The side has a stop portion that gradually expands outward, and an abutment space connected to the through hole is formed inside the stop portion; a pull rod includes a head, and the top side of the head is concave A steel buffer groove is provided, and the bottom side of the head has a first abutting surface that tapers and extends obliquely toward the bottom, and the bottom side of the first abutting surface protrudes outwards and can fit in the abutting space A second deformed part that is extruded and deformed with the top side of a preset nail gun sleeve, and the outer edge of the bottom side of the second deformed part has a downwardly extending protruding bump, and the second deformed part The center of the bottom of the deformation part has a breakaway part with a smaller diameter, and the breakaway part extends to the bottom and extends obliquely outwards and penetrates into the through hole and the abutting space through the first deformation part of the sleeve. A rod. And by pulling the pull rod with a preset nail gun, so that the first abutting surface hits the upper edge of the pipe body, the first deformation part on the pipe body will be deformed, and the pull rod The system is not easy to rotate in the first deformation part and will not counteract the pull-down force. At the same time, the second deformation part on the pull rod will deform in the tube, and the steel recessed on the top side of the head The permanent buffer groove system can reduce the rigidity of the head, so as to ensure that the head of the pull rod will not break during the pulling process.

The secondary purpose of the present invention is that the outer wall diameter and length range of the tube body of the casing is 2.9~3.2mm, and the inner wall diameter length range is 2.2~2.4mm; the top side of the tube body to the stopper The height range of the bottom side is 2~3mm; the height range from the junction of the pipe body and the stop part to the bottom side of the stop part is 0.7~0.9mm; the vertical height range of the outer wall of the bottom side of the stop part is The vertical height of the inner wall is 0.2~0.4mm and the vertical height range of the inner wall is 0.2~0.5mm; the diameter and length of the bottom side of the outer wall of the stopper is 4.9~5.1mm and the diameter and length of the inner wall of the bottom side is 3.05~3.25mm mm.

Another object of the present invention is that the diameter and length range of the top surface of the head of the pull rod is 2.9~3.2mm, and the diameter length range of the top side of the steel buffer tank in the head is 2.4~2.6mm, and The diameter from the top side to the bottom side of the steel buffer tank is 0.3mm~0.5mm, the height range from the top side of the head to the bottom side of the second deformation part is 1~2mm, and the bottom surface of the second deformation part diameter The length range is 2.2~2.4mm.

Another object of the present invention is that the steel buffer tank is a conical space tapered from the top side to the bottom side, and the angle of the steel buffer tank chamfering to the top side is 60 to 120 degrees.

Another object of the present invention is that the steel buffer tank is a cylindrical space that tapers from the top side to the bottom side, and the angle of the steel buffer tank chamfering to the top side is 60 to 90 degrees.

Another object of the present invention is that the abutting space of the sleeve is a cylindrical space with a top side chamfered, and the angle range of the top side chamfering of the abutting space is 60 degrees to 120 degrees, and the first The angle range of a resisting surface obliquely extending upward toward the head is 60° to 120°.

Another object of the present invention is that the bevel angle from the top side to the bottom side of the abutting space is in the range of 30° to 120°, and the optimum angle is 40°.

Another object of the present invention is that the ring-shaped second abutment surface on the top side of the preset nail puller sleeve is inserted into the stop portion of the sleeve, so that the abutment space inside the stop portion A cylindrical space in the shape of "︹", the cylindrical space in the shape of "︹" is the space filled by the deformation of the second deformation part of the tie rod.

1: Casing

11: tube body

110: perforation

12: The first deformation department

13: stop part

130: contact space

2: pull rod

21: head

210: steel buffer tank

22: The first support surface

23: The second deformation part

231:Increasing material bump

24: Detachment Department

25: rod body

3: Preset puller sleeve

31: Second abutment surface

4: Preset the first plate

40: The first positioning slot

5: Preset the second plate

50: The second positioning slot

H1: The height from the top side of the pipe body to the bottom side of the stopper

H2: The height from the junction of the pipe body and the stopper to the bottom of the stopper

H3: Vertical height of the outer wall of the bottom side of the stop

H4: vertical height of the inner wall of the bottom side of the stop

H5: The height from the top side to the bottom side of the steel buffer tank

H6: The height from the top side of the head to the bottom side of the second deformation part

H7: The height from the top side to the bottom side of the steel buffer tank

L1: The diameter and length of the outer wall of the pipe body

L2: inner wall diameter length of pipe body

L3: Diameter length of the bottom side of the outer wall of the stopper

L4: Diameter and length of the inner wall of the bottom side of the stopper

L5: Length of the diameter of the top surface of the head

L6: The diameter length of the top side of the steel buffer tank

L7: Diameter length of the bottom surface of the second deformation part

L8: The diameter length of the top side of the steel buffer tank

θ1: Angle of beveled cut against the top side of the space

θ2: The angle at which the first support surface extends obliquely upward toward the head

θ3: The angle at which the steel buffer groove in the head is obliquely cut to the top side

θ4: Angle of the oblique cutting of the steel buffer tank to the top side

[Fig. 1] is a three-dimensional appearance view of the pull rivet of the present invention.

[Fig. 2] is a three-dimensional exploded view of the pull rivet of the present invention.

[Fig. 3] is another three-dimensional exploded view of the pull rivet of the present invention.

[Fig. 4] is a side sectional view of the first operation of the pull stud of the present invention for fixing two plates.

[Fig. 5] is a side sectional view of the second operation of the pull stud of the present invention for fixing two plates.

[Fig. 6] is a side sectional view of the third operation of the pull stud of the present invention for fixing two plates.

[Fig. 7] is a side sectional view of the fourth operation of the pull stud of the present invention for fixing two plates.

[Fig. 8] is a side sectional view of the fifth operation of the pull stud of the present invention for fixing two plates.

[Fig. 9] is a side sectional view of the casing of the present invention.

[Fig. 10] is a side view of the tie rod of the present invention.

[Fig. 11] is another embodiment diagram of the steel buffer groove of the head of the tie rod of the present invention.

[Fig. 12] is another embodiment diagram of the sleeve pipe of the tie rod of the present invention.

Please refer to Figures 1 to 3, which are the three-dimensional appearance diagram, three-dimensional exploded view and another three-dimensional exploded view of the improved pull stud of the board-to-board fixing device structure of the present invention. It can be clearly seen from the figure that the present invention The pull rivet can be made of a metal material such as aluminum, copper, iron or stainless steel. The pull rivet of the present invention mainly includes a casing 1 and a pull rod 2, and the connection relationship of the aforementioned components is as follows:

The casing 1 comprises a tube body 11 with a perforation 110 inside, and the top side of the tube body 11 has a first deformed portion 12, and the bottom side of the tube body 11 has a baffle extended outwards. A stopper 13, and an abutment space 130 connected with the through hole 110 is formed inside the stopper 13;

The pull rod 2 includes a head 21, the top side of the head 21 is recessed with a rigid buffer groove 210, and the bottom side of the head 21 has a first abutting surface 22 tapering and obliquely extending towards the bottom, and The bottom side of the first abutting surface 22 has a second deformed portion 23 that protrudes outward and can be squeezed and deformed with the top side of a preset nail puller sleeve 3 in the abutting space 130 , and the first abutment portion 23 The outer edge of the bottom side of the second deformed part 23 has a material increasing protrusion 231 extending downward, and the center of the bottom of the second deformed part 23 has a disconnected part 24 with a smaller diameter, and the disconnected part 24 extends bottomwardly with an outward slant and passes through the sleeve The first deformation portion 12 of the tube 1 penetrates the through hole 110 and a rod body 25 of the abutting space 130 .

Please refer to Figures 9 and 10, which are the side view sectional view of the sleeve of the present invention and the side view of the tie rod. It can be clearly seen from the figure that the abutting space 130 of the sleeve 1 is a top side The beveled cylindrical space, and the angle θ1 of the beveled top side of the abutting space 130 ranges from 60 degrees to 120 degrees, and the angle θ2 of the first abutting surface 22 extending upward toward the head 21 is in the range of 60 degrees to 120 degrees, and the angle θ3 of the oblique cutting of the steel buffer groove 210 in the head 21 to the top side is 60 to 120 degrees, and the overall appearance of the head 21 and the first abutting surface 22 is It is a disc-shaped structure with a wide top and a narrow bottom, and the steel buffer groove 210 in the head 21 is a conical space tapered from the top side to the bottom side, and the overall appearance of the second deformation part 23 It is an inverted bowl-shaped structure with a narrow top and a wide bottom, and the overall appearance of the head 21 and the first abutting surface 22 is a disc-shaped structure with a wide top and a narrow bottom.

And in order to make the total thickness of a preset first plate 4 and a preset second plate 5 be limited to 1.6 ~ 2.4mm thin plate to operate, so that the pull rivets (fasteners) can exert maximum fastening and locking The resultant force (referring to tensile force and shearing force), for which there are size restrictions described later, the outer wall diameter and length L1 of the tube body 11 of the casing 1 ranges from 2.9 to 3.2 mm, and the inner wall The range of diameter length L2 is 2.2~2.4mm; the range of height H1 from the top side of the pipe body 11 to the bottom side of the stopper 13 is 2~3mm; The height H2 of the bottom side of the stop portion 13 ranges from 0.7 to 0.9 mm; the vertical height H3 of the outer wall of the bottom side of the stop portion 13 ranges from 0.2 to 0.4 mm and the vertical height H4 of the inner wall ranges from 0.2 to 0.5 mm; The diameter and length L3 of the bottom side of the outer wall of the stopper 13 ranges from 4.9 to 5.1 mm, and the diameter and length L4 of the bottom inner wall of the stopper 13 ranges from 3.05 to 3.25 mm.

The range of diameter L5 of the top surface of the head 21 of the pull rod 2 mentioned above is 2.9~3.2mm, and the diameter length L6 of the top side of the steel buffer groove 210 in the head 21 is 2.4~2.6mm. And the range of the height H5 from the top side to the bottom side of the steel buffer tank 210 is 0.3mm~0.5mm The height H6 from the top side of the head to the bottom side of the second deformation part ranges from 1 to 2 mm, and the diameter and length L7 of the bottom surface of the second deformation part ranges from 2.2 to 2.4 mm.

When the structure of the board-to-board fixing device of the present invention is improved in practice, the sleeve 1 is combined with a first positioning groove 40 symmetrically penetrating respectively on the preset first board 4 and the preset second board 5 and a second positioning groove 50, and the first positioning groove 40 and the second positioning groove 50 are inwardly inclined concave structures, and the stopper 13 on the sleeve 1 is against the second positioning groove 50. On the inner wall surface of the two positioning grooves 50, and the pipe body 11 on the sleeve 1 will pass through the first positioning groove 40 and the second positioning groove 50, and the rod body 25 of the pull rod 2 will pass through The perforation 110 in the pipe body 11 is pierced and protrudes out of the abutting space 130, please refer to Figures 4 to 8 again, it is the first, second, third, Four, five operation side sectional views, and can be clearly seen from the figure, on the bottom side of the rod body 25 of the pull rod 2, a preset pull rivet of a preset rivet gun (not shown) will pass through The gun sleeve 3 is clamped and fixed (as shown in FIG. 4 ), and the pull rod 2 is pulled downward by operating the preset nail puller, so that the first abutting surface 22 is abutted on the The top side of the first deformation part 12, and the preset nail puller system will continue to pull downwards, causing the first abutting surface 22 to generate a downward stress, and the first deformation part 12 will be subjected to the pressure. The first abutting surface 22 expands and deforms after the downward compressive stress (as shown in FIG. 5 ), and when the pull rod 2 is pulled out, the second deformed part 23 will abut against the preset rivet holster. On a ring-shaped second abutting surface 31 on the barrel 3, and the second deformation part 23 is deformed by pressing against the second abutting surface 31, so that the second deformation part 23 is deformed and filled In the abutting space 130 (as shown in FIG. 6 ) in the shape of "︹", and through the addition bump 231 on the bottom side of the second deformation part 23, it can be filled in the stopper part during the impact deformation process. The metal block inside 13 is increased, so that the volume of the metal block remaining inside the pipe body 11 and the inside of the stopper 13 is closer, and the preset nail puller is continued to be operated so that the pull rod 2 is continuously drawn downward pull, gaidi There will be fracture and separation between the two deformation parts 23 and the breaking part 24, and the preset nail puller uses a force of 1500 Newtons to pull the pull rod 2. In order to prevent the rigidity of the head 21 from being too strong, As a result, the head 21 of the breaking part 24 breaks ahead of time before separation, and the rigidity buffer groove 210 that disperses its rigidity is recessed on the top side of the head 21, so that the rod body of the pull rod 2 25 is pulled away at the casing 1 (as shown in Figure 7) to complete the riveting structure of the preset first plate 4 and the preset second plate 5, and tie the preset rivet gun sleeve 3 Disengage from the abutting space 130 (as shown in FIG. 8 ) to complete the riveting operation of the present invention.

Please refer to Fig. 11 again, which is another embodiment of the steel buffer groove of the head of the pull rod of the present invention, wherein the steel buffer groove 210 recessed on the head 21 of the pull rod 2 is formed by A cylindrical space tapered from the top side to the bottom side, and the angle θ4 of the steel buffer tank 210 chamfered to the top side is 60 to 90 degrees, and the height from the top side to the bottom side of the steel buffer tank 210 The range of H7 is 0.3mm~0.5mm, and the diameter length L8 range of the top side of the steel buffer tank 210 is 2.4~2.6mm, and the cylindrical space in the steel buffer tank 210 is not limited to this shape, And for example, a conical hole, a trapezoidal hole or a trapezoidal hole that disperses its rigidity can be formed in the head 21 to prevent the head 21 from breaking in advance during the drawing of the preset nail gun. The groove shape or structure of the arc hole is within the protection scope of the present invention.

Please refer to Figure 12, which is another embodiment of the sleeve of the pull rod of the present invention, wherein the abutment space 130 of the sleeve 1 is a cylindrical space with a top side chamfered, and the abutment The bevel angle θ1 range of the top side of the connection space 130 obliquely extending to the bottom side is 30 degrees to 120 degrees, and the bevel angle 40 degrees is the best angle, and in order to make a preset first plate 4 and a preset The total thickness of the second plate 5 is limited to the thin plate of 1.6~2.4mm for operation, so that the pull stud (fastener) can exert the maximum fastening and locking force (referring to tensile force and shear force), For this reason, there are size restrictions described below, The outer wall diameter length L1 of the tube body 11 of the casing 1 ranges from 2.9 to 3.2 mm, and the inner wall diameter length L2 ranges from 2.2 to 2.4 mm; the top side of the tube body 11 to the bottom of the stopper 13 The height H1 range of the side is 2~3mm; the height H2 range from the junction of the pipe body 11 and the stopper 13 to the bottom side of the stopper 13 is 0.7~0.9mm; the bottom side of the stopper 13 The vertical height H3 of the outer wall ranges from 0.2 to 0.4 mm; the diameter and length L3 of the bottom side of the outer wall of the stopping portion 13 ranges from 4.9 to 5.1 mm.

From the above-mentioned disclosure of Figures 1 to 12, it can be understood that the present invention is a structural improvement of a plate-to-plate fixing device, which includes: a sleeve, which includes a tube body with a perforation inside, and the top of the tube body The side has a first deformation portion, and the bottom side of the pipe body has a stop portion that gradually expands outward, and an abutment space connected to the through hole is formed inside the stop portion; a pull rod includes There is a head, the top side of the head is concavely provided with a steel buffer groove, and the bottom side of the head has a first abutment surface that tapers and extends obliquely toward the bottom, and the bottom side of the first abutment surface has an outward A second deformation part that protrudes and can be squeezed and deformed with the top side of a preset nail gun sleeve in the abutment space, and the bottom side outer edge of the second deformation part has a downward extending A material-increasing bump, and the center of the bottom of the second deformation portion has a breakaway portion with a smaller diameter, and the breakaway portion extends to the bottom with the first deformation portion obliquely extending outward and passing through the sleeve A rod penetrating through the through hole and the abutting space. The pulling rod is pulled by a preset nail gun, so that the first abutting surface hits the upper edge of the pipe body, which will cause the first deformation part on the pipe body to deform, and the pull rod The system is not easy to rotate in the first deformation part and will not counteract the pull-down force. At the same time, the second deformation part on the pull rod will deform in the tube, and the steel recessed on the top side of the head The permanent buffer groove system can reduce the rigidity of the head, so as to ensure that the head of the pull rod will not break during the pulling process. The present invention is applied in the field of riveting of two plates, and has excellent practicability, so a patent application is filed to seek the protection of the patent right.

The above is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Therefore, all simple modifications and equivalent structural changes made by using the description and drawings of the present invention should be included in the same way. Within the scope of the patent of the present invention, I agree with Chen Ming.

To sum up, the structure of the board-to-board fixing device of the present invention is improved in use, in order to achieve its effect and purpose. Therefore, the present invention is an invention with excellent practicability. In order to meet the requirements for patent application, it is proposed according to law Application, I hope that the review committee will approve this case as soon as possible to protect the hard work of the inventor. If the review committee of Junju has any doubts, please feel free to send a letter to instruct. The inventor will do his best to cooperate.

1: Casing

11: tube body

110: perforation

12: The first deformation department

13: stop part

130: contact space

2: pull rod

21: head

210: steel buffer tank

23: The second deformation part

24: Detachment Department

25: rod body

Claims (10)

A structural improvement of a board-to-board fixing device, including: A sleeve, which includes a pipe body with a perforation inside, and the top side of the pipe body has a first deformed part, and the bottom side of the pipe body has a stop part extending outward gradually, and the stopper An abutting space connected with the through hole is formed inside the stopper; A pull rod includes a head, the top side of the head is recessed with a steel buffer groove, and the bottom side of the head has a first abutting surface that tapers and extends obliquely toward the bottom, and the first abutting surface The bottom side has a second deformation part that protrudes outwards and can be squeezed and deformed with the top side of a preset nail gun sleeve in the abutment space, and the bottom side outer edge of the second deformation part is more There is a material-increasing protrusion extending downwards, and the center of the bottom of the second deformation part has a disconnected part with a smaller diameter, and the disconnected part extends to the bottom with an obliquely extending outward and passes through the sleeve. The first deformation part passes through the through hole and a rod body of the abutting space. The structural improvement of the plate-to-plate fixing device as described in Claim 1, wherein the outer wall diameter and length of the casing of the casing are 2.9~3.2mm, and the inner wall diameter and length are 2.2~2.4mm; The height range from the top side of the pipe body to the bottom side of the stopper is 2~3mm; the height range from the junction of the pipe body and the stopper to the bottom side of the stopper is 0.7~0.9mm; the stopper The vertical height range of the outer wall of the bottom side of the part is 0.2~0.4mm and the vertical height range of the inner wall is 0.2~0.5mm; the diameter length range of the bottom side of the outer wall of the stopper is 4.9~5.1mm and the inner The range of wall diameter and length is 3.05~3.25mm. The structural improvement of the board-to-board fixing device as described in claim 1, wherein the diameter and length of the top surface of the head of the tie rod range from 2.9 to 3.2 mm, and the diameter and length of the top side of the steel buffer tank in the head The range is 2.4~2.6mm, and the steel buffer tank is from the top side to the bottom The diameter of the side is 0.3mm~0.5mm, the height range from the top side of the head to the bottom side of the second deformation part is 1~2mm, and the diameter and length of the bottom surface of the second deformation part is 2.2~2.4mm. The structural improvement of the board-to-board fixing device as described in claim 1, wherein the steel buffer tank is a conical space tapered from the top side to the bottom side, and the angle of the steel buffer tank is chamfered to the top side The system is 60 to 120 degrees. The structural improvement of the board-to-board fixing device as described in claim 1, wherein the steel buffer tank is a cylindrical space tapered from the top side to the bottom side, and the angle of the steel buffer tank is chamfered to the top side The system is 60 to 90 degrees. According to the structural improvement of the board-to-board fixing device described in claim 1, the range of the bevel angle from the top side to the bottom side of the abutting space is 30 degrees to 120 degrees, and the best bevel angle is 40 degrees angle. The structural improvement of the board-to-board fixing device as described in Claim 1, wherein the overall appearance of the head and the first abutting surface is a disc-shaped structure with a wide top and a narrow bottom, and the overall appearance of the second deformation part It is an inverted bowl-shaped structure with a narrow top and a wide bottom. The structural improvement of the board-to-board fixing device as described in claim 1, wherein the abutting space of the sleeve is a cylindrical space with a top side chamfered, and the angle range of the top side chamfering of the abutting space is: 60 degrees to 120 degrees, and the angle range of the first resisting surface obliquely extending upward toward the head is 60 degrees to 120 degrees. The structural improvement of the board-to-board fixing device as described in claim 1, wherein the second abutment surface with a ring-shaped top side of the preset nail pull gun sleeve is inserted into the stopper portion of the sleeve, so that The abutting space inside the stopper is a cylindrical space in the shape of "︹", and the space in the shape of "︹" The cylindrical space of the shape is the space filled by the deformation of the second deformation portion of the tie rod. The structural improvement of the board-to-board fixing device as described in claim 1, wherein when the pull stud is combined with a preset first board and a preset second board, the preset first board and the preset second board are at the same time A symmetrical first positioning groove and a second positioning groove are provided on each of the opposite outer sides, and each of the first positioning groove and the second positioning groove is in an inclined inward concave structure, and the stopper is supported by the first positioning groove. Two positioning grooves, and the first abutting surface of the pull rod is simultaneously pulled and supported so that the inner wall of the first deformation part is expanded and deformed by stress, and its outer wall is supported against the first positioning groove, and the first deformation part The first positioning groove and the second positioning groove on both sides of the predetermined first and second boards are riveted and a fixed structure is formed.

Images