JPS635605B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention [Field of Industrial Application] The present invention relates to a fixture that can stably attach plates and the like at regular intervals.

[Prior Art] Panels such as chassis and printed circuit boards (hereinafter referred to as circuit boards) installed inside electrical equipment are placed and fixed on the chassis of electrical equipment at regular intervals in an insulated state, and the panels inside the equipment are fixed. Efforts are being made to utilize space effectively.

In this case, a fixture is used that maintains a constant parallel spacing between the boards, with one end of the post having a certain length having a mounting mechanism for gripping the other panel, and the other end having a mounting mechanism for gripping the other panel. A fixture is used in which a fixture having fixing legs for fixing to a panel or chassis is inserted and fixed into a fixing hole previously drilled in a substrate.

Examples of fixing legs that have been proposed in the past for such fixtures include the one shown in FIG. That is, a restraining piece 2 having an arcuate side cross section that restrains the substrate 1 from the surface, a connecting plate 3 in the center,
It consists of an arrowhead-shaped elastic check piece 8 whose left and right ends 4 and 5 are connected via connecting pieces 6 and 7, and the elastic check piece 8 passes through the fixing hole 9 of the substrate 1. ,
Together with the restraining pieces 2, the board is held between the front and back surfaces. Such a structure of the fixing leg portions is provided on both sides of the support base portion 10 to fix the two substrates.

However, in the fixture of the type shown in FIG. 1, the elastic check piece 8 protrudes from the outside of the board 1, but this protrusion is unsightly and seriously spoils the appearance of the electronic device. In addition, it often came into contact with other equipment, which was a nuisance. In order to avoid this problem, it is possible to reduce the protrusion of the elastic check piece 8 from the substrate 1, but it has been extremely difficult to reduce the protrusion below a certain limit due to the structure. Therefore, depending on the place of use, a decorative cover or the like may be required, which may increase the number of parts and manufacturing man-hours.

For example, in response to these problems,
A fastener described in Japanese Patent No. 16063 has been proposed that is inserted into two plates from the same direction and fixes them together. In such a fastener, only the flanged head, which can be formed flat, protrudes from the surface of the plate material on the side into which the fastener main body is inserted, resulting in a beautiful appearance.

[Problems to be Solved by the Invention] Against the background of the prior art, the problems to be solved by the present invention are as follows.

(1) In the fixture shown in FIG. 1, since the board 1 is attached to the restraint piece 2 from the elastic check piece 8 side, the thickness of the board 1 can have a certain tolerance range. That is, in the example shown in FIG. 1, the board is allowed to be attached to a thickness that allows the restraining piece 2 to extend almost horizontally.

However, in a fixture that penetrates and fixes two boards from the same direction, the restraining piece 2 is attached to the first
Even in the fastener described in the [Prior Art] section, the ear portion 14, which corresponds to the restraining piece, is not configured as shown in the figure. First, there was a problem in that only substrates with a single thickness could be fixed.

When attempting to attach a board having a thickness other than the predetermined thickness, if the board is thick, it may not be fixed sufficiently, whereas if the board is thin, wobbling may occur after fitting. This is because the member corresponding to the restraining piece must pass through the substrate, so there is little freedom in shape.

(2) Therefore, in order to obtain a certain degree of tolerance for differences in the thickness of the plate material, the fixing hole provided in the plate material is made into a special shape that matches the shape of the member corresponding to the restraining piece, such as a long hole or a round hole. Although various attempts have been made to do so, the following problems cannot be solved. In other words, when an external force is applied to a board, etc., the dimension between the two boards may become smaller if the fixture is tolerant of differences in board thickness, and the legs of resistors, ICs, etc. on the board may become smaller. This is a problem that could lead to unexpected accidents due to contact with other people. It will be readily understood that in the fixture shown in FIG. 1, the structure for allowing the difference in plate thickness allows the substrates to be moved in a direction in which the distance between the substrates becomes shorter. This problem is more difficult to avoid with a device that penetrates two substrates from the same direction and fixes them because there is less freedom in shape.

(3) Also, for the same reason, it has been extremely difficult to provide a structure that absorbs vibrations with a type of fixture that penetrates two plates from the same direction. However, such fixtures are often mounted in places where there is a lot of vibration, such as vehicles, and it has been desired to have a structure that prevents the vibrations applied to one board from being applied to another board.

The present invention solves the above-mentioned problems, and aims to provide a fixture that has a small protrusion to the outside of a board, etc., can mount board materials of different thicknesses to some extent, and can absorb vibrations well. .

Structure of the Invention [Means for Solving the Problems] The present invention has the following structure as a means for solving the above problems. That is, the fixture of the present invention is inserted into the fixing hole provided in each of the two opposing plates M1 and M2 from the outside of the second plate M2 to the first plate M1 side, and A fixture for fixing a plate material, comprising: a support part M3 having a diameter larger than the fixing hole of the first plate material M1 and having no flexibility; A check portion M4 that restores its original shape to prevent it from coming out when it passes through the fixing hole of the plate M1, and a support post M that extends from the other end of the support base portion M3.
5, is curved with the support side M3 inside, has a diameter larger than the fixing hole of the second plate M2, and has a peripheral edge perpendicular to the axial direction of the support column M5. A cap-shaped and thin-walled elastic check part M6 located above, and a pair provided on both sides with the support post M5 in between,
The distance between them increases as they move away from the support base M3, and has elasticity at least in the direction approaching the support post M5, and its tips lie in a plane including the peripheral edge of the opposing elastic check part M6. On the other hand, an elastic restraining piece M7 is spaced apart by the thickness of the plate, and the elastic restraining piece M7 is provided at the tip M7 of the elastic restraining piece, and as the elastic restraining piece M7 is restored after passing through the fixing hole of the second plate M2. It includes a stepped portion M8 that fits into the fixing hole.

Here, various shapes such as a spherical circular dish shape or a substantially trapezoidal shape can be considered as the elastic non-return portion M6, but the peripheral edge thereof is on a substantially plane perpendicular to the axial direction of the support column M5, and this prevents elasticity. Any shape may be used as long as it can come into contact with the second plate M2. In the case of a spherical circular plate shape, by selecting an appropriate radius of curvature, the height of the elastic check member M6 from the plate M2 can be freely designed.

Various well-known configurations may be considered as the non-return portion M4, such as one having an arrowhead-shaped engagement portion as shown in FIG. 1.

As the plate materials M1 and M2, a printed circuit board or a case for storing the printed circuit board can be considered. The spacing between the check part M4 and the elastic restraint piece M7 and the elastic check part M5 may be determined according to the thickness of the plate material.
In the fixture of the present invention, a difference in the thickness of the second plate M2 within a certain range is acceptable and can be fixed.

[Function] The fixture of the present invention has a non-return part M on the support base part M3.
4 side, it is inserted into the fixing hole of the second plate M2 and the fixing hole of the first plate M1, and both plates M1, M2 are inserted.
to be fixed. When the first plate M1 passes through the fixing hole, it returns to its original state and is firmly fixed between the check portion M4 and the support base portion M3, which prevents the first plate member M1 from falling out. Moreover, since the support base M3 does not have flexibility, the first plate M1 will not be displaced toward the second plate M2.
On the other hand, the second plate M2 has a stepped portion M8 at the tip of the elastic restraining piece M7 that returns to its original state when it passes through the fixing hole.
and a thin, cap-shaped elastic stop portion M6. Moreover, the elastic restraining piece M7 has a stepped portion M.
Since the movement in the expanding direction is restricted by the presence of the second plate M2, the second plate M2 will not be displaced toward the first plate M1. In addition, since the elastic check portion M6 is thin, elastic, and has a cap shape,
If the second plate material M2 is thick, it will deform, and even if the plate thickness is different, the second plate material M2 will be deformed together with the elastic restraining piece M7.
Clamp and fix 2 without changing.

[Example] An example of the present invention will be described below in detail based on the drawings.

In FIGS. 2 to 9, 12 is a fixed leg part,
It is composed of a connecting plate 14, an elastic check portion 16 provided at the tip thereof, and a pair of elastic locking pieces 18. The connecting plate 14 provided as a support is a plate-shaped member with a certain width, and its base is provided perpendicularly to the center of the support base part 20. At the tip of the connecting plate 14, there is an elastic check part 16 in the shape of a thin circular spherical plate.
is formed. The elastic check portion 16 is elastically deformable in the longitudinal direction of the connecting plate 14, and is configured to prevent the substrate 22 from the outer surface.
Elastic restraint pieces 18 of a constant width are elastically deformably and symmetrically arranged on both sides of the attachment part of the connecting plate 14 of the support base part 20, and both elastic restraint pieces 18 are disposed elastically and symmetrically as they approach the elastic check part 16. The outer dimensions of 18 are made larger. Stepped portions 26 that can fit into the fixed square holes 24 of the substrate 22 are formed at both ends of the elastic restraint piece 18 . Bottom surface 28 of stepped portion 26
The gap between the upper side of the outer peripheral edge of the elastic check part 16 is
2, and the elasticity of the elastic check portion 16 allows the substrate 22 to be reliably fixed. In addition, the vertical surface 3 of both stepped portions 26
The distance between the fixed square holes 24 is made wider than the inner dimension of the fixed square hole 24, so that the attachment based on the elastic expansion of the elastic restraining pieces 18 can be ensured. Also, the width direction (direction perpendicular to the paper surface of FIG. 2) of the tips of both elastic restraining pieces 18 is the same as that of the fixed square hole 2.
The dimensions in the same direction of No. 4 are the same or slightly smaller. Note that the outer shape of the elastic check portion 16 is larger than that of the fixed square hole 24. Therefore, the fixed leg portion 12 can be properly attached to the substrate 22 without any play. Further, a gap 32 with a certain gap is provided on the inside of the attachment base of both elastic restraining pieces 18 to the connecting plate 14, so that elastic deformation of the elastic restraining pieces 18 in the left-right direction can be easily performed. .

The support part 20 has the connecting plate 14 at its center.
and an elastic restraint piece 18 are installed, which protrude in a disc shape at right angles to the longitudinal direction of the connecting plate 14, and have the role of a restraint piece that supports the inner surface of the board 34. are doing.

Next, the structure of the upper part of the support base part 20 which functions as a non-return part will be explained.

A connecting plate 36 of a constant thickness extends from the center of the upper end surface of the support base part 20, and arrowhead-shaped elastic check pieces 38 are connected to the left and right ends of the connecting plate 36 so as to be elastically deformable. . As shown in FIG. 4, both sides of the elastic check piece 38 are arcuate, and as shown in FIG. 3, the width at the tip is slightly narrower than the width near the mounting base of the support base 20. This facilitates insertion of the elastic check piece 38 into the fixed round hole 40 of the base plate 34.

As shown in FIG. 5, the elastic check piece 38 has a cross section shaped like a half moon, and its outer dimensions increase from the tip of the connecting plate 36 toward the support base 20. There is. In addition, the lower left and right ends of the elastic check piece 38 are connected to the support base 20 via thin connecting pieces 42, as shown in the figure, so that the elastic check piece 38 can be elastically deformed in the left and right direction. ing. The lower end of the elastic check piece 38 and the support base portion 2
0 is approximately the same as the thickness of the substrate 34,
The substrate 34 can be restrained from the surface. Further, on the inner side of the connecting plate 36 mounting base of both elastic check pieces 38, a pickle 44 is provided to facilitate elastic deformation when the elastic check pieces 38 are inserted into the fixing round holes 40 of the board 34. It is designed to ensure expansion after insertion. These, connecting plate 3
6. The elastic check piece 38 and the connecting piece 42 constitute a check part for the board 34. Note that although the support base portion 20 overhangs from the support column 14,
Materials such as synthetic resins are not particularly provided with flexibility greater than the softness of the material itself. Also, connecting plate 3
6. The elastic check piece 38 and the support base part 20 are connected to the base plate 22
The size is such that it can pass through the fixed square hole 24 of.

To attach the fixing device having the above configuration to the board 22, when the fixing device inserted into the fixed square hole 24 from the elastic check piece 38 side is inserted in the same direction, the elastic stopper piece 18 is inserted into the fixed square hole. 24, and when it reaches the end, the elastic restraining piece 1
8 expands, and the stepped part 26 fits into the fixed square hole 24, and the bottom surface 28 of the stepped part 26 and the elastic check part 16
The substrate 22 is pressed against and securely held by the outer edge upper surface of the substrate 22 .

As explained above, the fixture of this example has two
It is inserted into the two substrates 22, 34 from the same direction and fixed, but since each substrate 22, 34 is fixed as described above, it has the excellent effect that the distance between the two substrates 22, 34 does not become narrow. can get. That is, even if an external force is applied to either of the substrates 22, 34, the support base portion 20 will not bend and the elastic restraining pieces 18 will not expand, so the distance between the substrates will not be reduced. Therefore, even if the lead wires, legs, etc. of electronic components protrude from the board 22 side of the board 34, the distance between the boards becomes small and the electrical components on the board 22 and the legs of the board 22 protrude.
2 There is no contact with itself. Moreover, the fixing tool of this embodiment can firmly fix even if the board thicknesses of the boards 22 and 34 are slightly different,
This solves the conflicting issues of ensuring tolerance for board thickness and ensuring dimensions between boards.

In addition, in this embodiment, since the fixing device is fixed to the substrate 22 by utilizing the elasticity of the outer edge of the spherical circular dish-shaped elastic check portion 16, as shown in FIG. Compared to the example, the height H of the protrusion from the substrate 22 can be made much smaller.
Therefore, when the board 22 is a printed circuit board or the like, it is avoided that the top of the elastic check portion 16 is removed when removing protrusions such as burrs after soldering that protrude from the back side of the board. Therefore, the fixing function of the fixed leg portion 12 is not impaired. By the way, the amount of protrusion H in FIG. 9 in this example is approximately 1.9 mm,
This was achieved at less than half the cost of the conventional example. Also, the appearance of electronic equipment will not be spoiled, and business trips will not interfere with other equipment.

In addition, the external diameter of the elastic non-return portion 16 of this embodiment is about 10 mm, which is large despite the small H, so that the contact radius with the board 22 is large and the fixed leg portion 12
can be reliably supported in a stable state.

Furthermore, the fixture of this embodiment has the following excellent effects. That is, since the outer edge of the elastic non-return portion 16 contacts the substrate 22 with elasticity, the contact area becomes extremely small and the contact pressure per unit area becomes high. As a result, this elastic outer edge tightly contacts the substrate 22, and can considerably prevent dust, fine particles, etc. from entering from the outside (if the elastic check portion 16 has a flat shape, this (I don't expect much of an effect.)

This effect is obvious when compared with the conventional fixing device shown in Figure 1, and considering that such a fixing device is actually used in a place with a very poor environment such as inside a vehicle, this effect is obvious. The effect is great. Moreover, in this embodiment, the elastic check part 16 has a spherical circular plate shape, so that burrs, etc., which may occur when such a fixing device is made of resin, may occur on the inner surface of the elastic check part 16. However, the above-mentioned dustproof properties are not adversely affected in any way.

Furthermore, in the fixture of this embodiment, when a board slightly thicker than the board 22 is used, the end portion 28 of the elastic restraint piece 18 is securely fitted into the fixed square hole 24 of the board 22. The elastic check portion 16 is elastically deformed. Therefore, there is a certain tolerance range for the thickness of the board to be attached, and within this range, there may be looseness or insufficient fitting (the end 28 of the elastic restraining piece 18 does not fit into the board 22). The substrate 22 can be securely fixed without causing any problems. Moreover, even if the substrate 22 vibrates, the vibration in the plane direction of the substrate 22 is suppressed by the elasticity of the elastic restraint piece 18.
Since the vibrations in the direction perpendicular to the plane of the board 34 are absorbed to some extent by the elasticity of the elastic non-return portion 16, there is little transmission of severe vibrations or shocks to the other board 34, and the structure of the board 34 mounted on the board 34 is reduced. It also contributes to improving the reliability of electronic components. In this embodiment, the elastic check piece 38 as a mounting mechanism also has the function of absorbing vibrations, so even if this fixture is used in a place that is subject to constant vibrations, such as an automobile, it will not absorb vibrations. The substrate 22 and the substrate 34 can be stably and reliably held at a constant distance by a simple operation.

In the above embodiment of the present invention, instead of the spherical circular plate-shaped elastic check part 16, an elastic check part 46 having a shape in which both sides or a part of the outer diameter are removed as shown in FIG. 10 is used. is also possible. Even if a part of the outer diameter is removed, as long as it is within the thickness of the elastic non-return portion 16 and its peripheral portion is included in approximately the same plane, dustproofness will not be impaired.

Further, it is also possible to employ other types of attachment mechanisms that are normally used as the mounting mechanism for the substrate provided on the upper end side of the support base section 20. for example,
It is also possible to provide different attachment mechanisms as shown in FIGS. 11, 12, and 13.

That is, the fixture 48 shown in FIG.
A mounting mechanism is provided at the tip of 9.
As shown in FIG. 14, the attachment mechanism includes a pair of elastic restraining pieces 52 attached to a connecting plate 51 in an arrowhead shape on a base 50, as in the case of the previous embodiment.
A pair of elastic pressing pieces 53 integrally formed with the base 50 are provided on both sides thereof. Elastic pressing piece 53
The advantage is that the substrate 34 can be gripped well due to its elasticity. Note that the substrate 2 on the base end side of the support column 49
2. The mounting structure is the same as in the previous embodiment. Fixtures 55, 56 shown in FIGS. 12 and 13
The same applies to

The fixture 55 shown in FIG. 12 has an attachment mechanism configured at the tip of the support column 58. As shown in FIG. 15, the attachment mechanism includes a base 59 provided at the tip of a support column 58, and an elastic restraint part 60 erected on the base 59. The elastic restraining portion 60 is formed by symmetrical thin pieces bent inward at the intermediate portion and integrally connected at the distal end thereof. A plate-shaped elastic locking piece 61 with one side inclined is integrally hung inside the tip of the elastic locking part 60.
In addition, a locking notch 62 is provided below the oblique side of the elastic locking piece 61.
is formed. When the elastic locking portion 60 and the elastic locking piece 61 are fitted into the circular hole 63 of the substrate 34,
The elastic locking portion 60 expands within the circular hole 63, and the board 34 is attached by being caught in the locking notch 62 of the elastic locking piece 61.

The fixture 56 shown in FIG. 13 has an elastic restraint part 68, substantially similar to that of the fixture 55, erected on a base 67 attached to the tip of a column 66. A locking notch 69 is formed near one bending point of the elastic locking portion 68, and the area below the locking notch 69 is made thinner than other parts of the elastic locking portion 68, so that elastic deformation is facilitated. There is. The board 34 is prevented from coming off by being caught by the locking notch 69.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments in any way, and can be practiced with various improvements and changes without departing from the gist of the invention. be.

Effects of the Invention As detailed above, according to the fixture of the present invention,
It is inserted into two plates from the same direction, (1) the first and second plates can be firmly fixed, and (2) the distance between the first and second plates can be secured and the distance between the two plates can be fixed. (2) At least the thickness of the second plate can be within a predetermined tolerance range; (4) The outward protrusion of the second plate can be reduced, and the appearance is improved. (5) The peripheral edge of the elastic non-return part can provide dust-proofing properties, and (6) the vibrations and shocks applied from the horizontal and vertical directions of the plate material can be appropriately absorbed. .

[Brief explanation of the drawing]

FIG. 1 is a front view of a conventional example. FIG. 2 is a front view of an embodiment of the present invention, FIG. 3 is a side view of the same example, FIG. 4 is a plan view of the same example, FIG. 5 is a cross-sectional view of FIG. The figure is a bottom view of the same example, FIG. 7 is a cross-sectional view of FIG. 3, FIG. 8 is a cross-sectional view of FIG. FIG. 10 is a bottom view showing another embodiment of the present invention. Moreover, FIGS. 11, 12, and 13 are front views showing other embodiments of the present invention, and FIGS. 14 and 15 are respectively front views showing other embodiments of the present invention.
FIG. 13 is a partial perspective view of the attachment mechanism of the fixture shown in FIGS. 1 and 12; Furthermore, FIG. 16 is a schematic diagram illustrating the basic configuration of the present invention. 12... Fixed leg part, 14, 36... Connecting plate, 1
6, 46...Elastic check part, 18...Elastic restraint piece,
20...Support part, 22, 34...Substrate, 38...
...Elastic check piece.

Claims (1)

[Claims] 1. A fixture that is inserted into a fixing hole provided in each of two opposing plates from the outside of the second plate to the side of the first plate to fix both plates. A support part that has a larger diameter than the fixing hole of the first plate material and is not flexible; and a support part that is provided at the tip side of the support part and is restored when it passes through the fixing hole of the first plate material. and a non-return portion that is provided at the tip of the support column extending from the other end of the support portion, is curved with the support portion side inward, and is larger than the fixing hole of the second plate. a cap-shaped thin-walled elastic check part having a diameter and whose peripheral edge is on a plane perpendicular to the axial direction of the support column; The distance between them increases as they move away from each other, and has elasticity at least in the direction approaching the support column, and its tip is spaced apart by the thickness of the plate with respect to a plane including the peripheral edge of the opposing elastic check section. an elastic restraint piece provided at the tip of the elastic restraint piece, and a stepped portion that fits into the fixation hole as the elastic restraint piece returns to its original state after passing through the fixation hole of the second plate. Fixtures provided. 2. The fixing hole of the second plate material is a square hole, the stepped portions at the tips of both elastic restraint pieces are shaped to fit into the square hole, and the support base portion can pass through the square hole, The fixture according to claim 1, wherein the fixing hole in the first plate member is a round hole. 3. According to claim 1 or 2, the elastic check part has a spherical circular dish shape, and the diameter of the dish part is larger than the dimension between the stepped parts of both elastic restraint pieces. Fixtures.