JPH01105007A - Coupling device for plate material - Google Patents

Abstract

PURPOSE: To eliminate idle running when the pin is rotated in the counter direction so as to raise the pulling up property by providing a rib forming part of the spiral engaged in the screw groove of the male screw portion in the insert hole of a grommet. CONSTITUTION: The mounting holes 24, 25 of two plates 22, 23 are put together for the leg 6 of a grommet to be inserted. The head 2 of a pin 4 is inserted into an insert hole 7. When the pin 4 is forced into the grommet 8, an diameter- expandable portion 17 is expanded under the plate 23 to clamp the two plates 22, 23 under a jaw 5 so that the plates are fixedly connected in an overlapped condition. When the pin 4 is rotated in the counter direction, a male screw 3 retreats and is pulled out from the insert hole 7, and the diameter-expandable portion 17 is reduced to its original dimension under the plate 23. In this way, it is possible to release the two plates 22, 23 from the overlapped fixed condition and separate them from each other. The retrieved pin 4 and grommet 8 can be reused.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a plate connecting device consisting of a screw pin and a grommet, and particularly to an improvement of the grommet.

(Prior art) Conventionally, as this type of coupling device, the
There is Publication No. 37.

This conventional coupling device includes a pin having a head and a male threaded part hanging from the lower surface of the head, a flange facing the head of the pin, legs hanging from the lower surface of the flange, and a flange. and a grommet having an insertion hole into which the male threaded portion of the pin can be inserted, communicating with the leg from the top surface of the pin, and the pin and grommet are each integrally molded of plastic.

A pair of vertical grooves extending radially around the insertion hole and a front vertical groove are formed in the leg portion of the grommet, respectively, and the upper ends thereof are connected to the lower surface of the collar portion. ,
Each lower end is interconnected by a hinge part, and has a pair of enlarged diameter parts whose diameter increases as the male thread part is inserted into the insertion hole,
Two hemispherical protrusions, upper and lower, which fit into the thread grooves of the male threaded portion of the pin are integrally protruded from each inner surface of the pre-cut diameter portion.

<Problems to be Solved by the Invention> However, the above-mentioned conventional coupling device has a problem in the ability to remove the pin by rotating it in a reverse thread direction.

That is, when connecting and fixing two plates, the diameter of the enlarged diameter portion of the grommet is expanded by forcing the male threaded portion of the pin into the insertion hole of the grommet. In order to release the fixed connection between the two plates, the pin may be rotated in the opposite direction. Due to this rotation in the opposite thread direction, the hemispherical protrusion in the insertion hole of the grommet follows the thread groove of the male threaded part of the pin, causing the male threaded part of the pin to move backward in the insertion hole of the grommet, moving away from the grommet. The target is better.

However, since the protrusion in the insertion hole of the grommet is hemispherical, the amount of engagement with the thread groove of the male threaded part of the pin is small.For this reason, when the pin rotates, a force is applied to push the grommet into the insertion hole. Then, the protrusion easily climbs over the thread.

Therefore, the male threaded portion of the pin may idle in the insertion hole of the grommet, making it difficult for the pin to be pulled out. In particular, when the pin is rapidly rotated using a power tool, this idling state is likely to occur, making it unsuitable for removal work using a power tool.

<Means for solving the problems> Therefore, the present invention solves the above problems, and includes:
The present invention will be described below using embodiments shown in the drawings.

The present invention provides that the insertion hole (7) has a protrusion (21) that forms a part of a helical shape and fits into the thread groove (13) of the male threaded portion (3) of the pin (4) midway along the height of the insertion hole (7). It is characterized by the formation of

(Function) First, to connect both plates (22, 23), connect both plates (22, 23).
22, 23) and insert the mounting holes (24, 25) on both sides.
) are aligned with each other and both aligned mounting holes (24, 25)
Insert the legs (6) of the grommet (8) in series.

Next, the head (2) of the pin (0) may be inserted from its tip into the insertion hole (7) of the grommet (8).

Incidentally, the pin (4) and the grommet (8) may be assembled in advance before the grommet (8) is inserted into both the mounting holes (24, 25).

Then, by strongly pushing the pin (4) into the grommet (8), the thread (12) of the pin (0) passes through the protrusion (21) one after another and advances through the insertion hole (7), causing the grommet ( The enlarged diameter part (17) of 8) expands in diameter under the plate material (23), and by sandwiching both the plate materials (22, 23) with the lower surface of the collar part (5), both the plate materials (22, 23) are connected and fixed in a polymerized state (Fig. 7).

Next, for maintenance etc., both plates (22°23)
When it becomes necessary to separate the pin (4) head (
2) should be rotated in the opposite direction.

When the pin (4) is rotated in the opposite direction, the thread groove (13)
The protrusion (21) fitted into the thread groove (13) follows the thread groove (13), so that the male thread part (3) moves backward through the insertion hole (7) and gradually moves upward. Therefore, the enlarged diameter portion (17) is reduced in diameter under the plate material (23) and restored to its original diameter.

Therefore, the leg portion 6 of the grommet (8) has both mounting holes (24,
25), so both plates (22゜23)
The superimposed fixed state of the two plates (22, 23) is released, and the two plates (22, 23) can be separated.

Further, the grommet (8) can be recovered by pulling it out from both the mounting holes (24, 25), and the recovered pin (4) and grommet (8) can be reused.

(Example> The present invention will be explained below based on embodiments shown in the drawings.

In the figure, 1 indicates a connecting device, and this connecting device 1 includes 1 head 2
A pin 4 with a male thread 3 hanging from the lower surface of the head 2; a collar 5 facing the head 2 of the pin 4; and a leg 6 hanging from the lower surface of the collar 5. and a grommet 8 having an insertion hole 7 into which the male threaded portion 3 of the pin 4 can be inserted, which communicates with the leg portion 6 from the upper surface of the flange portion 5. It consists of

As shown in FIG. 1, the pin 4 has a head 2 that includes a thin disc-shaped seat 9, a bolt-shaped bolt portion lO protruding from the upper surface of this seat portion 9, and A ten-shaped driver groove 11 is formed in a recess at the center of the upper surface into which the cutting edge of a driver (not shown) is inserted. Furthermore, head 2
, only one of the bolt portion 10 and the driver groove 11 may be provided, and the driver groove 11 may be a minus groove instead of a ten groove.

Further, as similarly shown in FIG. 1, the male threaded portion 3 has a shaft shape that hangs down from the center of the lower surface of the seat portion 9 and has a tapered tip, and has a semicircular cross section protruding from its peripheral surface. screw thread 12
and a thread groove 13 formed within the interval between the threads 12. Note that the shape and material of the pin 4 are not limited to those in the embodiment shown in the drawings, and metal bolts, screws, etc. may be used as they are.

Next, as shown in FIGS. 2 to 6, the grommet 8 has a flange 5 having an annular shape that is slightly larger than the seat 9 of the pin 4, and the seat 9 fits completely on the upper surface of the grommet 8. A shallow annular recess 14 is provided around the insertion hole 7 into which the insertion hole 7 fits.

The leg portions 6 are formed in a plurality of four vertical grooves 15 extending radially around the insertion hole 7, and are formed within the intervals between the respective vertical grooves 15, and each upper end are connected to the lower surface of the flange portion 5, and each lower end is interconnected by a hinge portion 16, and a plurality of four enlarged diameter portions whose diameter increases as the male thread portion 3 is inserted into the insertion hole 7! 7...

The enlarged diameter portion 17 has its tip gradually tapered to reach the hinge portion 16, and has a cone-shaped tapered surface 18 that reduces the inner diameter of the insertion hole 7 on its inner surface, and a tapered surface 18 on its outer surface. A vertical groove 19 having a V-shaped cross section is formed in the diameter-enlarged portion 17 to make it easier to bend.

The hinge portion 16 has a thin rod shape, and each upper end is connected to the tapered tip of each enlarged diameter portion 17, and each lower end is connected to a circular bottom portion 20 that becomes the bottom of the insertion hole 7. Part 16
are interconnected via the bottom 20.

On the other hand, in the insertion hole 7, a protrusion 21 forming a part of a helical shape that fits into the thread groove 13 of the male threaded portion 3 of the pin 4 is formed in the middle of its height. In this case, the protrusion 21 has a semicircular cross section, and both ends 21' thereof.

21'' are staggered vertically, and continue in a spiral shape connected to the C1 thread.
Similarly, multiple □ numbers and strips may be formed.

Next, in order to connect and fix the two plates 22, 23 in a superposed state using the pin 4 and grommet color having the above-described configuration, first, attach the two plates 22, 23 to each other as shown in Fig. 1-7. Similarly, circular mounting holes 24 and 25 are formed, respectively, with a diameter equal to or slightly larger than the outer diameter of the leg 6 through which the leg 6 of the grommet 8 passes.

On the other hand, the pin 4 and the grommet 8 may be combined when connecting the two plate materials 22 and 23, but in this case, in order to simplify their handling, the male threaded portion 3 of the pin 4 is inserted into the insertion hole 7 of the grommet 8. Place it as a temporary combination with shallow insertion.

That is, when the male threaded portion 3 of the pin 4 is inserted, the thread 12 of the male threaded portion 3 and the protrusion 21 protruding into the insertion hole 7 come into contact. When the pin 4 is pushed in strongly, the thread 12 and the protrusion 21 form a semicircular cross section, so the thread 12 is pushed into the protrusion 21.
While slightly expanding the diameter of the insertion hole 7 by prying it, it passes over the protrusion 21 and advances into the insertion hole 7. When the thread 12 overcomes the protrusion 21, the insertion hole 7 returns to its original diameter due to the elastic restoring force of the enlarged diameter portion 17, etc. around the insertion hole 7, and at this time the protrusion 21 crosses the thread 12. It snaps into the upper threaded groove 13, and the male threaded part 3 is held in a state of being shallowly inserted into the insertion hole 7 (FIG. 7).

Note that in this inserted state, the male threaded portion 3 has not reached the tapered surface 18 of the enlarged diameter portion 17, so the enlarged diameter portion 17 does not expand in diameter and maintains its original diameter.

Next, as shown in FIG. 7, the two plates 22.23 are stacked vertically, the mounting holes 24.25 of both are aligned with each other, and the grommet 8 is inserted into the aligned reattachment hole 24.25. The legs 6 of the pin 4 are inserted in series, and the head 2 of the pin 4 is inserted at the position where the lower surface of the collar 5 of the grommet 8 hits the upper surface of the upper plate 22.
All you have to do is push it firmly into the grommet 8.

As a result, the thread 12 passes through the insertion hole 7 while overcoming the protrusions 21 one after another, and the thread 12 passes through the tapered surface 18.
be in contact with Here, since the inner diameter of the insertion hole 7 is narrower than the outer diameter of the male threaded portion 3 due to the tapered surface 18,
If the male threaded portion 3 is forcibly inserted into this small diameter space 26,
Tapered surface 18 is pushed radially outwardly by thread 12 .

Therefore, the enlarged diameter portion 17 has a connecting portion 17 with the lower surface of the collar portion 5.
' from the hinge part 16, bulges radially outward under the lower plate 23, and extends between both plates 22.2 and the lower surface of the collar part 5.
3 from above and below, both plates 22 and 23 are connected and fixed in a superposed state (FIG. 8).

The pushing limit of the pin 4 is regulated at the position where the lower surface of the seat 9 is in contact with the upper surface of the annular recess 14 of the grommet 8, and in this state, the seat 9 is firmly inserted into the annular recess 14. fit into the condition.

Next, when it becomes necessary to separate the plates 22 and 23 for maintenance or the like, the head 2 of the pin 4 may be rotated in the reverse thread direction.

In this case, since the head 2 of the pin 4 is provided with the bolt part lO and the driver groove 11, the bolt part lO may be turned with a spanner, box wrench, etc., or the tip of the driver may be inserted into the driver groove 11. You can insert it and turn it.

In this way, when the head 2 of the pin 4 is rotated in the reverse screw direction, the protrusion 21 fitted into the thread groove 13 is rotated into the thread groove 13.
By tracing , the male threaded portion 3 moves backward through the insertion hole 7, and the extraction gradually ascends. Therefore, the diameter of the enlarged diameter portion 17 is reduced under the lower plate member 23 due to its elastic restoring force, and the diameter is restored to the original diameter.

Therefore, the diameter of the leg portion 6 of the grommet 8 is such that it can be removed from the reattachment hole 24.degree. 25, so that the overlapping and fixed state of both the plates 22 and 23 is released, and the plates 22 and 23 can be separated.

Then, the grommet 8 can be recovered by pulling it out upward from the reattachment holes 24 and 25.

On the other hand, when the enlarged diameter portion 17 is restored, the hinge portion 1
6, the hinge portion 16 restores its original state while being pulled evenly inward in the radial direction. Therefore, the enlarged diameter portion 17 does not undergo plastic deformation and become enlarged and then fail to return to its original state, and the recovered portion can be reused.

On the other hand, FIGS. 9 to 22 show a second embodiment of the coupling device l, and the structure will be explained below. The same reference numerals are given to the parts, and some explanations thereof will be omitted.

As shown in FIGS. 1O to 14, the pin 4 of this embodiment has a relatively thin head 2, and has only a driver groove 11 in the center of its upper surface into which the cutting edge of a driver (not shown) is inserted. There is. Further, a long hole 27 is provided in the male threaded portion 3 midway along its height, extending in the axial direction and passing through the male screw portion 3 from front to back.

On the other hand, as shown in FIGS. 15 to 19, the grommet 8 has insertion holes 7 in the collar 5 that extend radially in all directions around the insertion holes 7 that are connected to each of the four vertically divided grooves 15 of the leg 6. , and four open cutouts 28 on the top surface. or,
The annular recess 14 of the flange 5 is made large enough to fit the head 2 of the pin 4, and when the male thread 3 of the pin 4 is completely inserted into the insertion hole 7, the flange 5 and head 2 are inserted into the annular recess 14. The top surface is made to be flush.

Further, the protrusion 21 is formed from within the thickness of the flange portion 5 to the inner surface of the enlarged diameter portion 17, and is divided into four parts by the notch portion 28 and the vertical groove 15 in the middle of its length. The divided protrusions 21a to 21d are arranged so as to form part of a helical shape. As shown in FIG. 19, the upper end 21a' of the upper protrusion 21a and the lower end 21d' of the lower protrusion 21d face each other vertically in steps j with the vertical groove 15 in between.

In addition, as shown in FIG.
1- and 1- may be alternately arranged vertically in the same plane on the inner surface of the enlarged diameter portion 17.

According to the second embodiment, the long hole 27 is provided in the male threaded portion 3 of the pin 4.
Since the screw thread 12 is pushed by the protrusion 21 while passing over the protrusion 21, the outer diameter of the male threaded portion 3 is slightly reduced. At the same time, the grommet 8
8, when the protrusion 21 is pushed by the thread 12, the inner diameter of the opening of the insertion hole 7 expands. Therefore, due to the synergistic effect of the two, the screw thread 12 and the protrusion 21 move in the direction of moving away from each other, which not only reduces the insertion force of the pin 4, but also allows the thread 12 and the protrusion 21 to move away from each other. It can prevent it from being crushed.

Incidentally, either the pin 4 or the grommet 8 of the first embodiment may be used in combination with either the pin 4 or the grommet 8 shown in the second embodiment.

Furthermore, by providing the notch 28 in the flange 5, there is an advantage that the amount of protrusion of the protrusion 21 during molding can be increased.

This will be explained by showing a mold for forming the grommet 8 in FIG. A core pin 32 serves as a male mold to be formed.
The recesses for forming the protrusions 21 of the grommet 8 recessed on the outer periphery of the grommet 8 are shown.

When molding the grommet 8, the fixed mold 29 and the movable mold (not shown) are brought together and clamped, and then the movable mold is moved to open the mold. After the mold opening is completed, the molded product is ejected by the ejecting pin 30 and released from the fixed mold 29.

At this time, by forcefully removing the core pin 31 at the same time,
The protrusion 21 is formed at the site of the recess 32 of the core pin 31.

Therefore, in order to increase the amount of protrusion of the protrusion 21, it is necessary to increase the depth of the recess 32 of the core pin 31, but as the recess 32 of the core pin 31 becomes deeper, the force of the core pin 31 during molding It becomes difficult to punch out the mold, making it impossible to release it from the mold or causing distortion in the molded product. Therefore, in boat fishing, mold release has been made possible by making the recess 32 of the core pin 31 shallow, but this has caused the problem that the amount of protrusion of the protrusion 21 cannot be increased.

On the other hand, in the second embodiment, the notch 28 is provided in the flange 5.
By providing this, when the core pin 31 is forcibly removed, the diameter of the insertion hole 7 expands from the notch 28 and the vertically divided groove 15, making it easier to release the mold compared to a case without the notch 28. Therefore, the recess 32 of the core pin 31 is deepened accordingly,
There is an advantage that the amount of protrusion of the protrusion 21 can be increased.

Therefore, the amount of engagement between the protrusion 21 and the male threaded portion 3 of the pin 4 can be further increased, and the pin 4 will not slip even when rotated rapidly using an electric screwdriver, and removal using an electric screwdriver will not occur. A coupling device suitable for workability can be provided.

<Effects of the Invention> - As explained above, according to the present invention, the protrusions and the thread grooves of the male threaded portion have mutually complementary shapes, so when the pin is rotated in the reverse thread direction, there is no slippage, and both The helical shape can jointly improve the climbing performance.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIGS.
Fig. 1 is an exploded perspective view, Fig. 2 is a side view of the grommet, Fig. 3 is a plan view of the grommet, Fig. 4 is a bottom view of the grommet, and Fig. 5 is a view taken from A-A in Fig. 3. 6 is a sectional view taken along line A, FIG. 6 is a sectional view taken along line B-B in FIG. 9 is a sectional view showing the connection state of both plates, FIGS. 9 to 22 are views of the second embodiment, FIG. 9 is an exploded perspective view, and FIG.
Figure 0 is a front view of the pin. Fig. 11 is a side view of the same, Fig. 12 is a plan view of the same, Fig. 13 is a bottom view of the same, Fig. 14 is a sectional view taken along line C-C of Fig. 12, Fig. 15 is a side view of the grommet, Fig. 16 is the same plan view, Fig. 17 is an open bottom view, and Fig. 18 is the same plan view.
The figure is a cross-sectional view taken along line D-D in Figure 16, Figure 19 is a cross-sectional view taken along line E-E in Figure 16, and Figure 20 explains the procedure for attaching the connecting device to both plates. Fig. 21 is a sectional view showing the connected state of both plate materials, Fig. 22 is a sectional view showing the mold for molding the grommet, and Fig. 23 is a sectional view showing another example of the grommet. It is. In the figure, 1 is a connecting device, 2 is a head, 3 is a male thread, 4 is a pin, 5 is a collar, 6 is a leg, 7 is an insertion hole, 8 is a grommet), 13 is a screw groove, and 15 is a Vertical groove, 16 is hinge part, 1
Reference numeral 7 indicates an enlarged diameter portion, 22, 23 indicates a plate material, and 24° and 25 indicate respective mounting holes thereof. Figure 1 Figure 21 Figure 22

Claims (1)

[Scope of Claims] A pin having a head and a male threaded portion hanging down from the lower surface of the head, a flange facing the head of the pin, a leg hanging from the lower surface of the flange, and a pin of the flange. a grommet that communicates with the leg from the top surface and has an insertion hole into which the male threaded portion of the pin can be inserted, and the leg of the grommet has a plurality of longitudinal grooves extending radially around the insertion hole; , are respectively formed within the interval of this vertical groove, each upper end is connected to the lower surface of the collar part, each lower end is mutually connected by a hinge part, and the diameter increases as the male thread part is inserted into the insertion hole. A connecting device for plate materials, the device having a plurality of enlarged diameter portions, and in the insertion hole, a protrusion forming a part of a helical shape that fits into a thread groove of a male threaded portion of a pin is formed midway along the height of the insertion hole.