KR910005129Y1 - Board connection device - Google Patents

Abstract

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Description

Board connection device

1 to 8 are views of the first embodiment of the present invention, the first view is an exploded perspective view.

2 is a side view of the grommets

Third degree copper plan view.

4th is a copper bottom view.

5 is a cross-sectional view taken along the line A-A of FIG.

6 is a cross-sectional view taken along line B-B in FIG.

7 is a cross-sectional view for explaining a mounting procedure of a connecting device of a positive plate material.

8 is a cross-sectional view showing a connection state of the positive plate material.

9 to 22 show a second embodiment, and FIG. 9 is an exploded perspective view.

10 degrees front view of the pin.

11 is a side view of the same.

12 is a copper plan view.

Figure 13 is a copper bottom view.

14 is a cross-sectional view taken along the line C-C of FIG.

15 is a side view of the grommets.

FIG. 16 is a copper plan view.

17 degrees copper bottom view.

18 is a cross-sectional view taken along the line D-D of FIG.

19 is a cross-sectional view taken along the line E-E of FIG.

20 is a cross-sectional view for explaining the installation procedure of the connecting device of the positive plate material.

21 is a cross-sectional view showing the connection state of the positive plate material.

22 is a cross-sectional view of a molding die of a grommets.

23 is a cross-sectional view of another embodiment of a grommets.

* Explanation of symbols for main parts of the drawings

1: connecting device 2: head

3: male thread 4: pin

5: corner portion 6: leg portion

7: insertion hole 8: grommet

13: screw groove 15: longitudinal split groove

16: hinge portion 17: enlarged portion

22, 23: board 24, 25: each mounting hole

The present invention relates to a device for connecting a plate of screw pin (Grommet) and, in particular, to the improvement of the grommet.

Conventionally, there is a Japanese Utility Model Publication (Notice No. 60-21537) as such a connection device.

The conventional connecting device includes a pin with a male thread hanging from the bottom of the head and the head, and an edge portion facing the head of the pin, and a leg from the top of the leg and the edge hanging from the bottom of the corner. It becomes a grommet provided with a fitting hole so that the male screw part of the said pin connected can be inserted, and a pin and a grommet are each integrally molded from plastic.

And, in the leg portion of the grommet, a pair of longitudinal split grooves extending radially about the insertion hole, and formed in the interval between both longitudinal split grooves, each upper end is in contact with the lower surface of the corner portion; At the same time, each lower end is provided with a pair of enlarged parts or the like which are connected to each other at the hinge part and enlarged as the male thread part is inserted into the fitting hole, and each inner side of both enlarged parts is fitted into the screw groove of the male thread part of the pin. Each of the upper and lower hemispherical protrusions to be placed is integrally formed.

However, in the conventional connecting device, there is a problem in that the pin rotates in the reverse thread direction and comes out.

In other words, when connecting two sheets of paper, the enlarged part of the grommet was enlarged by forcibly pressing the male thread part of the pin into the grommet's insertion hole.

And when releasing the fixing state of the positive plate material, the pin is rotated in the reverse direction of the screw.

With this rotation in the reverse thread direction, the hemispherical projection in the insertion hole of the grommet turns around the thread groove of the male threaded portion of the pin, and the male threaded portion of the pin retreats into the grommet insertion hole and rises relatively out of the grommet.

However, the projection in the insertion hole of the grommet is hemispherical, so there is little engagement with the screw groove of the male thread portion of the pin.

Therefore, if a pressing force is applied in the hole into which the grommet is inserted at the time of pin rotation, the protrusion easily rides over the screw thread.

Therefore, the male threaded portion of the pin may be idle in the grommet insertion hole, and the pin may hardly come off.

In particular, if the pin is rotated rapidly by using a power tool, this idle state is likely to occur, which is also a disadvantageous condition for disassembly work using the power tool.

Therefore, the present invention to solve the above problems will be described embodiments according to the drawings.

The present invention is characterized in that in the hole 7 to be inserted, a protrusion 21 is formed to form a part of the spiral inserted into the screw groove 13 of the male threaded portion 3 of the pin 4 in the middle of the height thereof. In order to connect the positive plate materials 22 and 23, the positive plate materials 22 and 23 are superimposed, and both mounting holes 24 and 25 are made to be mutually spaced, and both mounting holes which become a guardian. The legs 6 of the grommet 8 are inserted into the 24 and 25 in series.

Next, the head 2 of the pin 4 may be tilted in conformity with the insertion hole 7 of the grommet 8 at its tip.

In addition, the pin 4 and the grommet 8 may be assembled in advance before the grommet 8 is inserted into the take-up holes 24 and 25.

Then, when the pin 4 is strongly pushed into the grommet 8, the screw thread 12 of the pin 4 rushes into the hole 7 to be inserted while gradually moving over the protrusion 21 and the grommet 8 The enlarged portion 17 of the plate portion 23 is opened below the plate 23, and the positive plate material 22 and 23 are separated between the lower surface of the edge portion 5, so that the positive plate material 22 and 23 are folded. Secure the connection (Figure 7).

Next, when repairing, it is sufficient to rotate the head portion 2 of the pin 4 in the reverse screw direction when it is necessary to remove both the plate materials 22 and 23.

When the pin 4 is rotated in the reverse thread direction, the projection 21 inserted into the screw groove 13 turns the screw groove 13 so that the male screw portion 3 reverses into the insertion hole 7 and gradually comes out.

Therefore, the enlarged portion 17 is reduced below the plate 23 to restore the original diameter.

Therefore, the leg portion 6 of the grommet 8 becomes the diameter of the take-out hole 24, 25, so that the positive plate materials 22 and 23 overlap and release the fixed state so that the positive plate materials 22 and 23 are released. Can be separated.

In addition, the grommets 8 can be taken out of the take-up holes 24 and 25 to be recovered, and the collected pins 4 and grommets 8 can be reused.

Hereinafter, the present invention will be described based on the embodiments shown in the drawings.

(1) in the figure shows a connecting device, the connecting device (1) comprising a pin (4) having a head (2) and a male screw part (3) hanging from the lower surface of the head (2). The edge portion 5 facing the head 2 of the pin 4 and the leg portion 6 and the upper portion of the edge portion 5 and the leg portion 6 hanging from the bottom surface of the edge portion 5 are connected to the leg portion 6. And grommet 8 having a hole 7 for inserting the male threaded portion 3 of the pin 4 in communication therewith, and the pin 4 and the grommet 8 are made of plastic. Each is molded and carried out integrally.

As shown in Fig. 1, the pin 4 has a disk-shaped seat 9 whose head portion 2 is thin, a bolt-shaped bolt 10 protruding from the upper surface of the seat 9, and the bolt portion. The driver groove 11 of the + type which fits in the front-end | tip of the driver (not shown) formed in the recessed part of the center of the upper surface of 10 is provided.

In addition, the head part 2 may form only one side of the driver groove 11 in the bolt part 10, and the driver groove 11 may be a-groove, not a + groove.

In addition, the male screw portion 3 is an axial shape of an external shape that is arranged in the center of the lower surface of the seat portion 9, as shown in FIG. 1, and a screw thread 12 and a cross section protruding semicircularly in the main surface thereof. A thread groove 13 or the like formed in the gap between the thread 12 is formed.

In addition, the shape and material of the pin 4 are not limited to the thing of the Example shown by drawing, You may use a metal bolt, a screw, etc. as it is.

Next, the grommet 8 has a corner portion 5 as shown in Figs. 2-6, rounded off at the seat 9 of the pin 4 to form a large annular shape, and on the upper surface thereof, the seat 9 is formed. Is formed with a thin annular recess 14 around the fitting hole 7 to be fitted.

Moreover, the said leg part 6 is formed in the space | interval of the plurality of vertical grooved grooves 15 and each vertical grooved groove 15, respectively, which extended radially centering around the insertion hole 7, respectively, Is connected to the lower surface of the edge portion 5, and at the same time, the lower end is connected to each other by the hinge portion 16, a plurality of, four enlarged portions that are opened by the insertion of the male screw portion 3 of the insertion hole (7) Has 17.

The enlarged portion 17 has an inclined tapered surface 18 which decreases the inner diameter of the insertion hole 7 on its inner side and gradually reaches the hinge portion 16, and at the same time the outer side thereof. In order to facilitate bending the enlarged portion 17, a vertical groove 19 having a V-shaped cross section is formed.

The hinge portion 16 forms a thin rod, and each upper end is a circular bottom portion 20 that becomes the bottom of the hole 7 into which each lower end is inserted into the front end portion of the front outer portion of the expansion portion 17, respectively. The hinge portions 16 are connected to each other through the bottom portion 20 by connecting to each other.

On the other hand, in the above-mentioned hole 7, the protrusion 21 which forms the spiral part which fits into the screw groove 13 of the male screw part 3 of the pin 4 in the middle of the height is formed.

Here, the protrusions 21 are semicircular in cross section, and both ends 21 'and 21 "are continuous in a spiral connected to one set in a staggered state with the ends up and down.

In addition, you may form a plurality of protrusions 21 like the screw groove 13.

Next, when the two plates 22 and 23 are fixed in the folded state by using the above-described pin 4 and grommets 8, first As shown in FIGS. 1 and 7, the outer diameters of the leg portions 6 through which the leg portions 6 of the grommet 8 pass are generally the same, or form slightly larger circular mounting holes 24 and 25, respectively. .

On the other hand, the pin 4 and the grommet 8 may be combined when the positive plate materials 22 and 23 are connected. It is left in the temporary combination state to be shallowly inserted into the insertion hole 7 of 8).

That is, when the male screw part 3 of the pin 4 is inserted, the screw thread 12 of the male screw part 3 and the protrusion 21 which protruded in the fitting hole 7 abut.

When the pin 4 is pressed strongly, both end faces of the screw thread 12 and the protrusion 21 form a semicircular shape, and the screw thread 12 slightly enlarges the hole 7 into which the protrusion 21 is twisted and inserted. Proceed into the hole 7 to ride over the ledge 21 and insert it.

Then, when the screw thread 12 rides over the protrusion 21, the hole 7 to be fitted with elastic restoring force such as, for example, the enlarged portion 17 around the insertion hole 7 returns to the original diameter. The projection 21 is fitted into the upper screw groove 13 of the screw thread 12 so that the male screw portion 3 is held shallowly in the fitting hole 7 (Fig. 7).

In the inserted state, the male screw portion 3 does not reach the tapered surface 18 of the enlarged portion 17, so that the enlarged portion 17 maintains the original diameter without expanding.

Next, as shown in FIG. 7, the two sheets 22 and 23 are piled up and down to align both mounting holes 24 and 25 with each other, and then the grommets are fitted to the fitted mounting holes 24 and 25. FIG. The leg 6 of the pin 8 is inserted in series, and the head 2 of the pin 4 at a position where the lower surface of the corner portion 5 of the grommet 8 is in contact with the upper surface of the upper plate 22. ) Is strongly pushed into the grommet (8).

Therefore, the threaded screw 12 contacts the taper surface 18 of the screwed screw 12 by rushing into the insertion hole 7 while gradually riding over the ledge 21.

Here, the inner diameter of the insertion hole 7 is in contact with the tapered surface 18.

Since the inner diameter of the hole 7 to be inserted here is narrower than the outer diameter of the male threaded portion 3 by the tapered surface 18, the male threaded portion 3 is excessively split into the small diameter space 26. ) Is pressed radially outward by the screw thread 12.

Therefore, the enlarged part 17 protrudes radially outwardly under the lower plate 23 at the joint part 17 'and hinge part 16 of the lower surface of the edge part 5, and the corner part 5 The two plate materials 22 and 23 are lifted up and down between the bottom surface of the up and down, and the two plate materials 22 and 23 are fixed in a folded state (FIG. 3).

Moreover, the limit which the pin 4 pushes in is restrict | limited to the position where the lower surface of the seat part 9 contacted the upper surface of the ring-shaped recessed part 14 of the grommet 8, and in this state, the seat part 9 is ring-shaped recessed. It becomes in the state pinched by the part 14.

Next, in the maintenance or the like, when it is necessary to separate both the plate materials 22 and 23, the head 2 of the pin 4 may be rotated in the reverse direction.

At this time, since the head part 2 of the pin 4 is provided with the bolt part 10 and the driver groove 11, you may turn the bolt part 10 with a fastener, a box wrench, etc., and also the driver groove 11 ), The tip of the screwdriver can be screwed in.

In this way, when the head 2 of the pin 4 is rotated in the reverse thread direction, the hole 21 into which the screw 21 is fitted into the screw groove 13 turns the screw groove 13 so that the male screw portion 3 is inserted into the screw thread 13. 7) We reverse inside and gradually come out.

Therefore, the enlarged portion 17 is reduced below the lower plate member 23 by its elastic restoring force and restored to the original diameter.

Therefore, the leg portion 6 of the grommet 8 becomes the diameter of the take-out holes 24 and 25 so that the fixed state of the positive plate materials 22 and 23 is released, and the positive plate materials 22 and 23 are released. ) Can be separated.

The grommets 8 can be recovered by pulling them up from the take-up holes 24 and 25.

On the other hand, when the enlarged portion 17 is restored, the hinge portions 16 are connected to each other, so that the enlarged portions 17 are equally pulled radially inward by the hinge portion 16 and restored.

Therefore, the expansion part 17 can reuse what was collect | recovered, without restoring as it expanded by plastic deformation.

9 to 22 show a second embodiment of the connecting device 1, and the configuration thereof will be described below. In the description, the same components as those of the first embodiment described above will be denoted by the same reference numerals. The description is omitted.

In the pin 4 of the present embodiment, as shown in Figs. 10-14, the head portion 2 is relatively thin, and the tip of the driver (not shown) is inserted into the center of the upper surface thereof to form only the driver groove 11.

In addition, the male screw portion 3 extends in the axial direction in the middle of the height thereof, and forms a long hole 27 penetrating back and forth.

On the other hand, the grommet 8 has an insertion hole 7 connected to each of the four vertical grooves 15 of the leg portion 6 to the corner portion 5 as shown in FIGS. 15 to 19. The four cutouts 28 which extend radially and open on the upper surface are formed in four centers centering on the cross-section.

In addition, the ring-shaped concave portion 14 of the corner portion 5, the head portion 2 of the pin 4 is sized to fit tightly, and the hole 7 into which the male screw portion 3 of the pin 4 is inserted. The top surface of the corner part 5 and the head part 2 are equally spaced in the state fully inserted in the).

In addition, the protrusion 21 is formed over the inner surface of the enlarged portion 17 inside the thickness of the edge portion 5, and the middle of the length is divided by the cutout portion 28 and the longitudinal splitting groove 15. Split into dogs, each of the divided stones 21a-21d is excreted to form part of the spiral.

Then, the upper end 21a 'of the upper ridge 21a and the lower end 21d' of the lower ridge 21d are oriented with each other with a stepped up and down as shown in FIG.

23, the upper end 21 "', the lower end 21" ", etc. of the protrusion 21 may be stepped up and down in the same plane of the inner surface of the enlarged part 17. As shown in FIG.

According to the second embodiment, the long thread 27 is formed in the male threaded portion 3 of the pin 4 so that the screw thread 12 is pushed by the protrusion 21 when passing over the protrusion 21. The outer diameter of the male screw portion 3 is slightly reduced, and at the same time, the grommet 8 has a cutout portion 28 formed therein. When the protrusion 21 is pressed by the screw thread 12, the hole 7 is inserted. The inner diameter of the open part of the tube expands.

Therefore, due to the synergistic effect of both, the screw thread 12 and the protrusion 21 are staggered while moving in the direction away from each other, and the insertion force of the pin 4 can be lowered, as well as the screw thread 12 or the protrusion 21 ) Can be prevented from crushing.

One of the pins 4 and the grommet 8 of the first embodiment may be used in combination with one of the pins 4 or the grommet 8 shown in the second embodiment.

Moreover, there is an advantage that the protrusion amount of the protrusion 21 at the time of molding can be increased by forming the cutout portion 28 in the corner portion 5.

This will be described with reference to FIG. 22 by forming the mold for forming the grommet 8.

In the figure, reference numeral 29 denotes a fixed mold of one side, numeral 30 denotes a protruding pin of a molded article, numeral 31 denotes a center pin that forms a male frame in which an insertion hole 7 of the grommet 8 is formed. 32 is a recess formed in the outer circumference of the center pin 31 to form the protrusion 21 of the grommet 8.

At the time of forming the grommet 8, the stationary mold 29 and the movable mold (not shown) are mutually joined to each other, and then a molten raw material is injected.

Next, the movable mold is moved to open the mold, and then the molding layer is protruded with the protruding pin 30 to be peeled off from the fixed mold 29.

At the same time, the protrusion 21 is formed on the inner circumference of the grommet 8 corresponding to the recess 32 of the center pin 31 by forcibly drawing out the center pin 31.

Therefore, in order to increase the protrusion amount of the protrusion 21, it is necessary to deepen the depth of the concave portion 32 of the center pin 31, but to deepen the concave portion 32 of the center pin 31 It is difficult to forcibly peel off the center pin 31 at the time of shaping | molding, and it is easy to damage a molded article.

Therefore, in general, it was possible to peel off by making the recess 32 of the center pin 31 shallow, but there was a problem that the protrusion amount of the protrusion 21 could not be increased.

On the contrary, in the present invention, when the center pin 31 is forcibly peeled off by forming the cutout portion 28 in the corner portion 5, the inserted hole 7 is cut out of the cutout portion 28 or the vertical splitting groove 15. This makes it easier to peel off as compared to the absence of the cutout 28.

Therefore, there is an advantage that the concave portion 32 of the center pin 31 can be deepened and the amount of protrusion of the protrusion 21 can be increased.

Therefore, the engagement amount between the protrusions 21 and the male threaded portion 3 of the pin 4 can be further increased, and there is no idle of the pin 4 even when the motor is rotated rapidly by using an electric screwdriver. It is possible to provide a connection device suitable for workability.

As described above, according to the present invention, the screw grooves of the protrusions and the male threads form a complementary shape, so that when the pin is rotated in the reverse screw direction, the spirals of both are combined with each other without any revolution, thereby improving the performance.

Claims (1)

A pin having a head and a male thread hanging from the bottom of the head, an edge facing the head of the pin, and a male thread portion of the pin communicating with the leg from the top of the leg and a corner hanging from the bottom of the corner. A grommet 8 having an insertable hole therein, each leg of the grommet is formed radially around the fitted hole, and each upper end is connected to the lower surface of the corner part, and each lower end Has a plurality of enlarged portions which are connected to each other at the hinge portion and have tapered surfaces formed in the inner side thereof with the tapered surface facing the hinge portion in the interposed hole, in which the screw groove of the male screw portion of the pin is located in the middle of the height thereof. Connection device for plates formed with masonry forming part of the spiral to be fitted.