JP2001214911A - Combining means of metal thin plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combining means capable of ensuring a relative position by required accuracy and complementing rigidity of a burring nozzle, when two sheets of plate materials are overlapped in a prescribed direction. SOLUTION: A nozzle 14 provided to protrude as a prepared hole 13 for an internal thread by burring work is protruded to a side of a contact surface 17 mounting a combination mate member, for instance, printed board 16. A screw mounting hole 18 drilled in the printed board 16 has an internal diameter D fitted by a clearance fit to an external diameter d2 of the above nozzle 14. The printed board 16 is accurately positioned in a prescribed position by fitting the nozzle 14 to the mounting hole 18, rigidity of the nozzle is reinforced by a support of the mounting hole 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining means for joining members made of a thin metal plate, and more particularly to joining means for projecting a nozzle by burring.

[0002]

2. Description of the Related Art As shown in FIG.
When a self-tapping screw M3 or more of M3 or more is used as a connecting member on a thin metal plate 101 mm or less, the amount of threading of the self-tapping screw 102 is insufficient, and incomplete screw tightening is likely to occur. 103
Burring is performed to secure the length of.

[0003] First, a burring nozzle 1 of a thin metal plate 101
There is a known means for forming a burring nozzle 104 by drilling a pilot hole at a position where the pit 04 is formed, inserting a burring punch into the pilot hole, and ironing a thin metal plate.
The burring nozzle 104 formed by the burring process does not interfere with the coupling partner 105,
Surface 1 opposite to contact surface 106 on which mating member 105 is mounted
07.

[0004]

However, the wall thickness t of the formed burring nozzle 104 is small.
Becomes thinner than the plate thickness T. Tapping screw 1 as a connecting member
For example, as the burring nozzle 104 is protruded higher with respect to a screw hole having a constant inner diameter, the wall thickness t of the burring nozzle 104 becomes thinner and the rigidity of the burring nozzle 104 Run short.

Accordingly, the contact surface 10 of the mating member 105
The rigidity of the burring nozzle 104 projecting almost independently to the space opposite to the space 6 is weak, and there is no durability in repetition of disassembly and reassembly. The properties of the bond cannot be fully utilized.

[0006] In such a connecting means, the burring of this mode is sufficient if the members are merely connected for the purpose of not requiring a strict relative positional relationship between the members, and if disassembly and reconnection are not performed. However, if it is required to hold the members at a predetermined relative position with a required accuracy,
Generally, the relative position between the two members is adjusted before the screw connection, and a common through-hole penetrating between the members is drilled at a position different from the screw connection position, and the knock pin 108 is driven or implanted and positioned. Requires another step to be performed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a connecting means which can secure a relative position with a required precision by stacking two plate members in a predetermined direction, and can supplement the rigidity of a burring nozzle. It is.

[0008]

In order to achieve the above-mentioned object, in the present invention, there is provided a joining means for a metal thin plate, in which a female screw is formed at a thickness at a position where one of the two plate materials to be joined forms a screw. A nozzle is provided on a thin metal plate having a short length and formed by burring as a lower hole of a female screw so as to project toward a contact surface with a mating member.

The screw mounting hole drilled in the mating member has an inner diameter that fits into the outer diameter of the nozzle.
Preferably, the connecting member between the two plate members is a tapping screw, and the connecting partner is a printed circuit board.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a joining means for a metal thin plate according to the present invention. FIG.
FIG. 2 is an exploded perspective view showing a first embodiment of the present invention, and FIG.
FIG. 4 is a side view showing, in cross section, the manner of connection of each member. 10
Is a housing formed of a thin metal plate. A burring nozzle 14 having an outer diameter d2 having a screw hole 13 with an inner diameter d1 is connected to a bracket 12 formed by bending an ear plate 11a protruding from the edge 11 by burring. It is formed on the side of the contact surface 17 where the printed circuit board 16 as a mating member is mounted (see FIG. 2).

[0011] For example, a printed circuit board 1 as a coupling partner member
6, a screw mounting hole 18 having an inner diameter D is formed at a predetermined position. The inner diameter D of the screw mounting hole 18 is set to a dimension and a tolerance to fit the outer diameter d2 of the burring nozzle 14 projecting from the bracket 12 by loose fit. Further, the burring nozzle 14 is required to form a height h necessary for secure screwing of the self-tapping screw 20. In the first embodiment, the thickness S of the printed circuit board 16 which is a coupling partner is required.
Do not exceed 1.

As shown in FIG. 2, a printed circuit board 16 is fixed to the bracket 12. That is, by fitting the screw mounting hole 18 into the burring nozzle 14, the printed board 16 is guided by the burring nozzle 14, and is accurately positioned at a predetermined position. A self-tapping screw 20 is forcibly screwed into the lower screw hole 13 of the burring nozzle 14 projecting upward from the bracket 12 and facing the center of the screw mounting hole 18. The tapping screw 20 is screwed into the lower hole 13 of the burring nozzle 14 while forming a female screw. The upper surface of the printed circuit board 16 is pressed by the lower surface of the tapping screw head 22 to achieve coupling with the bracket 12.

As described above, by directing the projection of the burring nozzle 14 toward the printed board 16 which is the mating partner, the burring nozzle 14 guides the screw mounting hole 18 and functions as a positioning member for the printed board 16. Also, the burring nozzle outer diameter d2 and the mounting hole inner diameter D
Burring nozzle 1
The outer shell 6 is supported to improve the mechanical rigidity. Therefore, for example, even when the plate thickness of the bracket 12 is 0.8 mm or less, a reliable screw connection can be achieved by the burring nozzle 14 whose rigidity is reinforced by supporting the inner wall of the mounting hole 18.

FIG. 3 shows several examples of another embodiment to which the joining means of the metal thin plate according to the present invention is applied.
In the second embodiment (a), the plate thickness S2
And a female screw 33 is formed in the pilot hole 32 of the burring nozzle 31 by a normal tapping process, and a double nut 35 for preventing loosening is inserted into the threaded ordinary small screw 34. It has been given.

The double nut 35 is embedded in the bracket 36 by forming a recess 37 in the bracket 36. The projecting end 38 of the burring nozzle 31 is screwed into a screw mounting hole 39 by tightening a normal screw 34.
Is forcibly folded at the periphery of the member and is pressed against the surface of the mating member 30. This configuration is a connection that cannot be disassembled. Even if the small screw 34 is removed, the connection between the connection partner member 30 and the bracket 36 is maintained by the folded protruding end 38. This connection is released by breaking the folded protruding end 38, but reconnection is possible.

FIG. 3B shows a third embodiment in which the burring nozzle 41 is applied only for positioning. The mating member 40 has a plate thickness sufficient to receive the length of a screw which can provide a reliable bonding strength. The burring nozzle 41 has a prepared hole 4
No. 3 only inserts the screw portion of the small screw 44, and does not form a female screw. The coupling partner member 40 has a screw hole 45 formed coaxially with the outer diameter of the burring nozzle 41 and a fitting hole 49 which is united by a loose fit, and a tapping screw having the lower hole 43 of the burring nozzle 41 inserted through the screw hole 45. 44 is forcibly screwed in while forming a female screw, and fixes the mating member 40 to the bracket 46 at a fixed position. A normal tapping may be applied to the screw lower hole 45 to form a female screw, and an ordinary small screw may be screwed.

FIG. 3C shows a fourth embodiment in which a female screw is not provided in the pilot hole 53 of the burring nozzle 51 and a rivet 54 is applied. A screw mounting hole 59 of the mating member 50 corresponding to the burring nozzle 51 protruding from the bracket 56.
Is automatically determined according to the position of the rivet 5 against the shearing force in the direction of the arrow in the figure.
The burring nozzle 51 reinforces the drag of No. 4. Further, the burring nozzle 51 having such a configuration can be used as a turning shaft with a light load.

Although various embodiments have been described above, the above-described embodiments are not intended to limit the joining means of the metal sheets according to the present invention, and various applications are possible by changing the combination of the structures. It shows that there is.

[0019]

As is apparent from the above description, according to the joining means of the thin metal plate according to the present invention, the burring nozzle is projected so as to guide the mounting hole of the mating member. It is not necessary to provide a knock pin for this purpose, and the man-hour for erecting the knock pin is reduced, and the cost can be reduced. In addition, the inner diameter of the mounting hole of the mating member is loosely fitted to the outer diameter of the nozzle by burring, so the inner wall of the mounting hole reinforces the outer periphery of the nozzle, strengthening the rigidity of the nozzle and preventing incomplete screw tightening it can.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of a joining means of a metal thin plate according to the present invention.

FIG. 2 is a side view showing a cross section of the first embodiment according to the present invention.

FIG. 3 is a side view showing a cross section of another embodiment of the joining means of a metal thin plate according to the present invention, wherein (a) is a second embodiment,
(B) is the third embodiment, and (c) is the fourth embodiment.

FIG. 4 is a side view showing a cross section of a conventional connecting means of a metal sheet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Housing 11 Edge 12 Bracket (thin metal plate) 13 Screw hole 14 Burring nozzle 16 Printed circuit board (joining partner member) 17 Contact surface 18 Screw mounting hole 20 Tapping screw D Screw mounting hole inner diameter d2 Burring nozzle outer diameter

Claims (4)

[Claims] 1. A nozzle projecting by burring as a lower hole of a female screw on a thin metal plate not long enough to provide a female screw to a thickness at a position where one of the two plate materials to be screwed is screwed. And a metal sheet connecting means protruding toward a contact surface with a mating member. 2. The means for joining thin metal plates according to claim 1, wherein said screw mounting hole formed in said mating member has an inner diameter which fits loosely into an outer diameter of said nozzle. 3. The thin metal sheet joining means according to claim 1, wherein the joining member of the two plate members is a tapping screw. 4. The means for joining thin metal sheets according to claim 2, wherein said joining partner is a printed circuit board.