JPH0451208Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a connecting and fixing device for connecting and fixing two plates in a superposed state.

<Prior art> Conventionally, this type of connecting and fixing device has been disclosed in Japanese Unexamined Utility Model Publication No. 56-67411 by the present applicant. The second fastener is made of plastic and has a flange facing the head of the first fastener, and a cylindrical part extending from the upper surface of the flange into which the shaft of the first fastener is inserted. A known fastener is provided with locking means that engages with each other between the outer periphery of the shaft portion of the first fastener and the inner periphery of the cylindrical portion of the second fastener.

The conventional locking means has an annular locking cross section that engages with each other formed on the outer periphery of the shaft portion of the first fastener and the inner periphery of the cylindrical portion of the second fastener, and the shaft portion of the first fastener is 2. By inserting it into the cylindrical part of the fastener,
Both locking step surfaces engage with each other and lock the shaft portion of the first fastener in the cylindrical portion of the second fastener in a non-returning manner.

<Problems to be solved by the invention> However, in the conventional connection and fixing device, the facing distance between the head of the first fastener and the flange of the second fastener is
This is determined by the formation position of the locking stepped surfaces of both fasteners, so if there is variation in the thickness of the two plates, there is a problem that the two plates cannot be firmly connected.

Further, since both the locking sections engage each other in a non-returning manner, there is a problem that once the two fasteners are connected, they cannot be easily removed.

<Means for solving the problems> The present invention was developed with the aim of solving the above problems. a first plastic fastener that is passed through the mounting hole from above; a flange facing the head of the first fastener; and a flange extending from the upper surface of the flange to allow insertion of the shaft of the first fastener. a second plastic fastener having a cylindrical portion and passed from below through a mounting hole in a lower plate, and a threaded groove on the outer periphery of the shaft portion of the first fastener;
In the plate connecting and fixing device for vertically superimposing two plates, each of which is provided with an elastic piece protruding diagonally inward on the inner periphery of the cylindrical portion of the second fastener and whose tip engages with the thread groove, the second A pair of claws with a serrated cross section is provided protruding from the outer periphery of the upper end of the cylindrical portion of the fastener, and the thickness of the lower plate through which the second fastener is passed from below is equal to the thickness of the upper surface of the flange of the second fastener and the claws. The inner diameter of the mounting hole is approximately equal to the outer circumference of the cylindrical portion not including the claw portion, and the inner diameter of the mounting hole of the upper plate through which the first fastener is passed from above is It is characterized by being larger than the outer circumference of the upper end of the cylindrical portion including the claw portion.

<Example> The present invention will be described below based on an example shown in the drawings.

In the figure, reference numeral 1 indicates a connecting and fixing device, and this connecting and fixing device 1 includes a head 2 and a first fastener 4 having a shaft portion 3 hanging from the lower surface of the head 2;
It consists of a flange 5 facing the head 2 of the fastener 4, and a second fastener 7 having a cylindrical portion 6 extending from the upper surface of the flange 5 and into which the shaft 3 of the first fastener 4 is inserted; Both fasteners 4 and 7 are each integrally molded from a resin such as nylon having appropriate rigidity and elasticity.

As shown in FIGS. 2 to 4, the head 2 of the first fastener 4 has a + groove 8 on its upper surface, and a dish-shaped contact portion 9 that elastically contacts the upper surface of the plate around the head 2. will be established. Further, at least one thread (three threads in this case) thread groove 10 is provided on the outer periphery of the shaft portion 3 along its axial direction. The thread 11 forming this thread groove 10 has a serrated shape, and has a tapered surface 12 on the front surface in the direction of movement of the shaft portion 3 and a locking surface 13 that stands steeply on the rear surface in the direction of movement.

On the other hand, the second fastener 7 has a flange 5 having an annular shape, and a cylindrical portion 9 extending from the opening edge of the flange 5 . A substantially U-shaped notch 14 is formed facing each other in the peripheral wall of the cylindrical portion 6, and a pair of elastic pieces 15, 15 protruding diagonally downward into the cylinder are provided inside the notch 14. Protruding, both elastic pieces 1
Teeth portions 16, 16 are formed at the distal end of the fastener 5, forming part of a spiral that fits into the thread groove 10 of the shaft portion 3 of the first fastener 4, and projecting vertically in different steps.
Additionally, on the outer periphery of the tip of the cylindrical portion 6, as shown in FIG.
A pair of protruding claws 17, 17 having a serrated cross section,
The elastic piece 15 is provided protrudingly out of phase with the elastic piece 15 by 90 degrees.

Next, in order to connect and fix the two plates A and B in a superposed state using both fasteners 4 and 7 with the above structure, first, as shown in FIG. , a vertically penetrating mounting hole 18 having an inner diameter at least larger than the outer circumference of the distal end of the cylindrical portion 6 including both claw portions 17 of the second fastener 7 is formed, and a second plate material B at the bottom is provided with a mounting hole 18 having an inner diameter at least larger than the outer circumference of the tip of the cylindrical portion 6 including both claw portions 17 of the second fastener 7. 2. A mounting hole 19 having an inner diameter approximately equal to the outer periphery of the cylindrical portion 6 excluding both claw portions 17 of the two fasteners 7, and similarly penetrating vertically.
will be established. Further, the thickness of the second plate material B approximately corresponds to the facing distance between the upper surface of the flange portion 5 of the second fastener 7 and the lower ends of both claw portions 17.

Next, as shown in FIG. 4, the cylindrical portion 6 of the second fastener 7 is inserted from below into the mounting hole 19 of the second plate B from its tip.

When the cylindrical portion 6 of the second fastener 7 is inserted, its claw portion 17 comes into contact with the hole edge of the attachment hole 19 of the second plate B, and the outer circumference of the tip of the second fastener 7 is the inner diameter of the attachment hole 19 of the second plate B. Because it is smaller, both claws 17
is pushed by the inner edge of the attachment hole 19, bends slightly inward, and enters the attachment hole 19. Then, when both claws 17 pass through the mounting holes 19, both claws 17
The elastic restoring force of the entire cylindrical part 6 causes it to open outward to the left and right, and when its lower end catches the upper edge of the mounting hole 19, the second plate material B is clamped between it and the upper surface of the flange part 5 (the Figure 5). Therefore, the second fastener 7 can be temporarily fixed to the attachment hole 19 of the second plate B.

After the second fastener 7 is temporarily fixed to the second plate material B in this manner, the first plate material A is superimposed on the second plate material B, and both the mounting holes 18 and 19 are aligned.

Next, since the second fastener 7 is temporarily fixed, as shown in FIG. Just insert it.

When the shaft portion 3 of the first fastener 4 is inserted, the shaft portion 3 of the first fastener 4 is inserted into the mounting hole 1 which passes through the mutually.
8 and 19, it enters into the cylindrical portion 6 of the second fastener 7 and comes into contact with both elastic pieces 15.

Now, when the first fastener 4 is pushed strongly, the teeth 16 at the tips of both elastic pieces 15 are pushed against the tapered surface 12 of the thread 11 of the shaft portion 3 of the first fastener 4,
It bends radially outward from its base end and opens outward to the left and right.

When the tooth portions 16 of both elastic pieces 15 pass over the tapered surface 12 of the thread 11 of the shaft portion 3, both elastic pieces 15 close inward in the radial direction due to their elastic restoring force, and each tooth portion 16 fall into the thread grooves 10, respectively.

In this way, both elastic pieces 15 open when they hit the thread 11, close when they fall into the thread groove 10, and repeat opening and closing as the shaft 3 of the first fastener 4 advances, and this repetition gives the operator a clicking sensation. Conveyed.

Then, the lower surface of the head 2 of the first fastener 4 is
When it comes into contact with the upper surface of the plate material A, the first fastener 4 can no longer be pushed in, so when you stop pushing the first fastener 4, both elastic pieces 15 try to open outward in the radial direction due to their elastic restoring force. The force causes each tooth 16 to sink into the thread groove 10 (FIG. 1).
As a result, the lower end of each tooth portion 16 abuts against the locking surface 13 of the thread 11, so that the shaft portion 3 of the first fastener 4 is restrained in the cylindrical portion 6 of the second fastener 7 in a non-returning manner. Ru.

Therefore, both plate materials A and B are sandwiched from above and below between the lower surface of the head 2 of the first fastener 4 and the lower surface of the flange 5 of the second fastener 7, as shown in FIGS. Connected and fixed in a polymerized state.

In this state, when the + groove 8 on the upper surface of the head 2 of the first fastener 4 is screwed in with the tip of a screwdriver (not shown), the shaft portion 3 advances through the cylindrical portion 6 due to the action of the screw, and the first fastener The opposing distance between the lower surface of the head 2 of the second fastener 7 and the lower surface of the flange 5 of the second fastener 7 is gradually narrowed. At the same time, the abutment part 9 of the head 2 of the first fastener 4 is pressed against the upper surface of the first plate material A and is flattened, and the elastic restoring force of the abutment part 9 is also applied, so that both the plate materials A , B are fixed even more firmly.

Conversely, when the first fastener 4 is loosened, the shaft portion 3 moves backward through the cylindrical portion 6, so that the shaft portion 3 of the first fastener 4 finally comes out of the cylindrical portion 6 of the second fastener 7, and both fasteners 4 , 7 are disconnected (Figure 5).

Therefore, it is possible to temporarily fix both plates A and B in a superposed state by connecting both fasteners 4 and 7, and then permanently fix them after removing both fasteners 4 and 7. Also, it is possible to perform maintenance after the fact, etc. Even in this case, both fasteners 4 and 7 can be easily removed.

Furthermore, when both fasteners 4 and 7 are removed, as shown in FIG. 5, the second fastener 7 comes off while attached to the second plate B, so there is no risk of losing the second fastener 7. , then both Fuasuna 4 and 7
It is also easy to connect.

Furthermore, since both fasteners 4 and 7 can be easily removed,
It can also be assembled after manufacturing. By assembling them in this way, both fasteners 4 and 7 do not come apart, and their handling becomes easy.

In the embodiment shown in the drawings, the second fastener 7
Although a pair of elastic pieces 15 are protruded from the inner periphery of the cylindrical portion 6 facing each other, one of the elastic pieces 15 may be a rigid body, or the number of elastic pieces may be further increased.

<Effects of the invention> As explained above, according to the invention, since the facing distance between the head of the first fastener and the flange of the second fastener can be freely adjusted, the thickness of the plate material and both fasteners can be adjusted freely. Even if there are variations in the product itself,
It is possible to provide a plate material connection and fixing device that not only allows plate materials to be firmly connected and fixed, but also allows both fasteners to be easily connected and removed. Furthermore, since the second fastener can be securely fixed to the lower member using the collar and claw, the second fastener is first securely fixed to the lower plate, the upper plate is stacked on top of it, and the upper plate is fixed. By passing the first fastener through the mounting hole and connecting it to the second fastener, both members can be quickly fixed in an overlapping state. Further, even when both plates are disassembled for maintenance or the like, the second fastener is attached to the lower plate, so it can be easily reassembled.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a cross-sectional view showing a state in which the plates are connected and fixed, Fig. 2 is an exploded perspective view of both fasteners, Fig. 3 is an exploded side view of the same, and Fig. 4 and 5. The figure is a side view with the left half in section showing the procedure for attaching both fasteners, and FIG. 6 is another cross-sectional view of FIG. 1. In the figure, 1 is a connecting and fixing device, 2 is a head, 3 is a shaft, 4 is a first fastener, 5 is a collar, 6 is a cylinder, and 7
is a second fastener, 10 is a screw groove, 15 is an elastic piece,
A and B indicate plate materials, and 18 and 19 indicate respective mounting holes.

Claims (1)

[Claims for Utility Model Registration] A first fastener made of plastic that has a head and a shaft that hangs down from the lower surface of the head and is passed from above through a mounting hole in an upper plate; It has a flange facing the head and a cylindrical part extending from the upper surface of this flange to allow insertion of the shaft of the first fastener, and a plastic nozzle that is passed from below into the mounting hole of the lower plate. A threaded groove is provided on the outer periphery of the shaft portion of the first fastener, and an elastic piece is provided on the inner periphery of the cylindrical portion of the second fastener that projects diagonally inward and whose tip engages with the threaded groove. In a plate connecting and fixing device for vertically overlapping two plates, a pair of claws with a sawtooth cross section is provided protruding from the outer periphery of the upper end of the cylindrical part of the second fastener, and a lower part through which the second fastener passes from below is provided. The thickness of the plate material is made to match the facing distance between the upper surface of the flange part of the second fastener and the lower end of the claw part, and the inner diameter of the mounting hole is approximately equal to the outer circumference of the cylindrical part not including the claw part, A device for connecting and fixing plate materials, characterized in that the inner diameter of the mounting hole in the upper plate through which the first fastener passes from above is larger than the outer circumference of the upper end portion of the cylindrical portion including the claw portion.