JPH0680324B2 - Parent board type fastening device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION a) Field of Industrial Application The present invention is applicable to, for example, fixing a bumper to a mounting plate portion of a shock absorbing mechanism of an automobile, or attaching a panel to a supporting mechanism below the automobile. The present invention relates to a master plate type tightening and fixing device composed of one master plate and one or more screw rods, which is suitable for joining a pair of materials, especially a pair of plates in a superposed and closely contacted state.

b) Prior Art Conventionally, in mounting a bumper, usually, first, the shaft of the screw rod is projected to the outside of the mounting plate, that is, the first material, and then it is carefully aligned with the hole on the bumper or the second material. , In this way, the threaded rod can be joined with the second material by joining with the nut.

c) Problems to be Solved by the Invention However, the above-mentioned assembling work is difficult and time-consuming for an assembler. The assembler must first thread the threaded rod through the first hole in the blank and then proceed to mount the nut, holding it in place to keep it in place. The assembler then applies the necessary torque to the second threaded rod so that the material fits tightly on the second threaded rod, while supporting the first threaded rod against rotation, and between them. The material and the desired clamping angle must be maintained. Due to that relationship, it is not possible to use an intermediate screw first, or if the two materials need to be closely joined, hold the first threaded rod in place. What you cannot do is clear.

The prior art has utilized studs (studs) welded to the first or lower material to solve the above-mentioned problems. However, this weld requires a flat surface with no flaws. Therefore, further polishing is required to bring the two materials into close contact with each other on the flat surface. Further, it is necessary to keep in mind that this weld bolt has extremely excellent corrosion resistance in the joint portion or the weld portion with the first material or the lower material. Therefore, the above-mentioned prior art not only lacks the corrosion resistance of the welded portion of the bolt, but also the welded portion has a certain amount of torque applied to the screw shaft of the bolt by the tool for fitting the other screw or nut. Withstand strength is required, and further,
The strength is also required to withstand the axial force applied to the washer of the other screw. The mounting surface of the bolt should be such that the stress exerted during assembly does not cause breakage during and after assembly.

An object of the present invention is to eliminate the above-mentioned inconvenience, and is suitable for joining a pair of materials in a close state, and has a highly reliable main plate type tightening mechanism despite its mechanism being relatively simple and inexpensive. It is to provide a fixing device.

d) Means for Solving the Problems In order to achieve the above-mentioned object, the present invention has a head portion of a screw rod in which a head is exactly cast in a parent plate, and a rotation between the head portion and the parent plate. Circumferential direction consisting of radial projection means composed of a plurality of radial projections for preventing movement, and a support plate portion between the radial projections for preventing axial movement between the main plate and the radial projection means. And a lower surface of its head is exposed for clamp connection. Alternatively, in addition to the above, a tool receiving means having a predetermined shape is provided at the tip of the threaded rod in order to support the threaded rod against rotation when the nut is attached and detached.

e) Action The screw rod is prevented from rotating with the master plate by providing the radial projecting means, and is prevented from being displaced in the axial direction with the master plate by providing the circumferential projecting means. To be done.

Further, since the threaded rod is provided with the tool receiving means at the tip thereof, the rotation that occurs when the nut is attached and detached is prevented.

f) Embodiment Referring to FIG. 1, a main plate tightening and fixing device 10 according to the present invention is
A pair of relatively thin and flat materials, for example, a mounting plate portion 12 of an automobile bumper product and an automobile bumper portion 14 are joined in a completely flat surface-to-surface contact state. Further, the pair of materials has a pair of holes 16, 16 and 18, 18 arranged in a line, respectively, through which the device of the present invention is passed.

The device 10 of the present invention has at least one threaded metallic threaded rod 20, which comprises a head 22, a tip 24 and a threaded shank 26, the shank 26 Is preferably smaller in diameter than the outer diameter of the head portion 22 and larger than the outer diameter of the tip portion 24. Further, an axis 30 is defined in the shaft portion 26 as shown in FIG.

On the other hand, the device 10 of the present invention has an extremely flat and elongated master plate 32 made of a material that is easy to cast, and the head 22
According to the present invention, it is integrally molded on one surface of the main plate 32 or is implanted so as to be integrated, whereby the tip portion 24 and the shaft portion 26 are projected to the outside of the main plate 32. Become. As shown in FIGS. 4 to 5, the shaft portion 26 extends straight to the head portion 22 and extends from the lower surface 34 of the main plate 32 in the right angle direction.

The head 22 has a plurality of radially extending round protrusions 36 as a radial protruding means, which have a leaflet-shaped corrugated uneven shape, and the head 22 is firmly planted on the main plate 32. Once retracted, the rounded protrusion prevents relative rotation with the parent plate. That is, since this shape 36 forms a head-like outline of a screwdriver on the head 22, when casting or manufacturing a parent plate around the head 22, the material of the parent plate faces the outside of the parent plate. Except for the parts, they flow along these protrusions, which ensures a mechanical lock between the master plate and the head and prevents the screw rod and the master plate from rotating relative to each other. Furthermore,
As a circumferentially projecting means, a supporting plate 38 extending between the head 22 and the projecting portion 36 is provided on the entire surface of the head 22, and thereby an axial deviation, that is, an axis line 30 between the screw rod and the parent plate 32 is provided.
Prevents deviation in the direction of. In the illustrated embodiment, this attachment plate 38
Is provided on the uppermost end of the head 22 in a relatively thin film shape. Since the protruding portion 36 is exposed on the lower surface of the head portion 22, it becomes possible for the metal to mesh with each other and to be firmly fixed.

The radial and axial deviation prevention measures ensured by the structure provided on the head 22 as described above are based on the force applied to the threaded rod 20, for example, by internally screwing as shown in FIG. It is also effective when a nut 40 is fitted. Further, as a measure for preventing the rotational displacement between the head 22 and the main plate 32, an additional recess 42 (see FIG. 3) is provided at the uppermost end of the head 22, and the recess generally has a corrugated or protruding shape. The surface is preferably the same as that of the round protrusion 36 described above, and the centers thereof are preferably aligned with each other.

When the nut 40 is fitted, the head 22 turns around and the parent board 32
As a preventive measure to prevent the tool from coming off, a tool receiving means 44 is provided at the tip portion 24. This is a corrugated depression with a radial protrusion. The shape is very similar to the round protrusion 36. This recess allows the nut 40 to
When it fits in 26, it helps to put the auxiliary tool in the uneven part to prevent the screw rod from turning. In this case, it is also possible to use a power tool to tighten the nut 40, and don't worry about applying a considerable twisting force. As described above, the above-described structure is most effective for preventing the screw rod 20 from being disengaged from the parent plate 32 by the axial force applied to the shaft portion 26 when the nut 40 is tightened.

These uneven portions, that is, the corrugated portion 36 that spreads radially.
It is desirable that the depressions 42 and the tool receiving concave-convex portions 44 be arranged in multiple wavy patterns, preferably the hexagonal wavy pattern described and illustrated in US Pat. No. 3,584,667. The attachment plate 38 extends in the middle of the multi-wave-shaped protrusion 36.

In FIGS. 1 to 5, the second screw rod 20a is also the parent plate 3
The second threaded rod 20 of 2 is implanted on the opposite side or integrated. This second screw rod is the screw rod described above.
It is completely independent of 20 and its shaft 26a has the first screw rod 2
It protrudes to the outside of the main plate in parallel with the shaft portion 26 of 0.

The main plate 32 is formed in a completely symmetrical manner, and the head receiving portions 46, 48 at both ends are generally a pair of thickened ones, and the screw rods 20, Holes 54 and 56 into which the head of 20a fits are provided.

The middle portion 50 of the main plate 32 can be made thin, and as shown in FIG. 4, a thin portion 52 can be further provided in the middle. As shown in FIG. 1, holes 16, 16 and 1
Inside the 8,18, there is a sleeve-shaped spacer 58,59 on the shaft 26,
It is provided around 26a.

In the embodiment shown in FIGS. 5 to 6, the screw rod 20b is provided only on one side of the main plate 10b, and the protruding columnar portion 60 is provided at the other end, which protrudes outward from the completely flat plane 34b. Generally, it is projected in the same direction as the shaft portion 26b of the screw rod 20b. It is desirable that the protruding columnar portion 60 has exactly the same length as the shaft portion 26b of the screw rod 20b (including its tip portion 24b). Further, it is desirable that the outer diameter of the protruding columnar portion 60 is exactly the same as the maximum outer diameter of the thread of the shaft portion 26b. Also, the thickened end portion 62 of the parent plate 32b having the columnar portion 60
It is desirable that the portion of the columnar portion 60 that extends to the outer diameter is generally shorter than the length of the outer extension portion that extends to the left of the shaft portion 26b, as shown in FIG.

8 to 9 show a third embodiment of the present invention, which is a parent board 32c.
The one end 46c has the same threaded rod 20c as that shown in FIG. 2, and the other end has a somewhat thickened portion 64, the length and width of which are exactly the same as the one end 46c. However, it is desirable that the other end 64 of this parent plate has a hole 66 formed therein, and that its cross section has the same size as the maximum screw thread outer diameter of the shaft portion 2b. As shown in FIG. 9, this through hole 66 is oval, and both cross sections of the oval are preferably the same size as the maximum thread outer diameter of the shaft portion 26c. It is desirable that the size of the smaller cross section of the hole 66 is exactly the same as the outer diameter of the thread of the shaft portion 26c, and the size of the other larger cross section is somewhat larger.

In each of the above embodiments, each of the parent plates 32, 32b, 32c is preferably made of a corrosion-resistant plastic material that is easy to mold. Further, it is desirable that at least the portions of the screw rods 20, 20a, 20b, 20c protruding from the parent plate are coated with a corrosion preventing coating material.

From the above, as a method for manufacturing the device of the present invention of the type generally described, the head of the screw rod is embedded in one side of the master plate at the time of manufacturing, and, for example, casting is performed at the same time when the master plate itself is manufactured. Recommended method. This method is also applicable to molding a pair of the same screw rods 20 and 20a in the embodiment shown in FIGS. On the other hand, in the case of the columnar portion 60 in the embodiment of FIGS. 6 to 7 and the through hole 66 in the embodiment of FIGS. 8 to 9, they may be manufactured together when the master plate 32c is manufactured. However, the holes 66 may be made later using punching, stamping or any other suitable method.

Although the specific embodiments of the present invention have been illustrated and described in detail above, those skilled in the art can make changes and modifications of the present invention in a wider field within the scope of the present invention. It goes without saying that the scope of the invention is thus not limited to the particular embodiments and constructions described above.

g) Effects of the Invention As described above in detail, in the present invention, the screw rods 20, 20a, 20b, 20c in which the heads 22, 22b, 22c are exactly cast in the master plates 32, 32b, 32c are used.
At its head, a radial projecting means 36 is provided, so that the screw rod is prevented from rotating relative to the master plate, and a circumferential projecting means 38 is provided so that the screw rod is Axial movement relative to the main plate is prevented.

Further, since the tool receiving means 44 is provided at the tip end portion 24 of the screw rod, it is possible to prevent the rotation that occurs when the nut 40 is attached and detached.

The present invention has succeeded in achieving a means for achieving various effects with high reliability in a relatively simple and inexpensive manner.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a partial longitudinal section showing a state in which the device of the present invention is integrally combined with a material to be combined, and FIG. 2 is an enlarged view of a screw used in the present invention. FIG. 3 is a side view, FIG. 3 is a perspective view of FIG. 2, FIG. 4 is a side view showing a first embodiment of the device of the present invention with the nut removed, and FIG. FIG. 6 is a perspective side view showing a second embodiment of the present invention, FIG. 7 is a perspective view taken along the line 7-7 in FIG. 6, and FIG. 8 is a third embodiment of the present invention. Fig. 9 is a vertical side view showing Fig. 9 is a perspective view taken along the line 9-9 in Fig. 10, 10, 10b, 10c ... parent plate type fastening and fixing device 20, 20a ... screw rod, 22 ... its head , 24 ...... its tip, 26 ...... its shaft, 32 ...... parent plate, 34 ...... its lower surface, 36 ...... round protrusion (radial protrusion means), 38 ...... attachment plate (circumference) Direction protrusion means), 40 …… nut, 42 …… Look, 44 ...... tool receiving means, 46 and 48 ...... threaded rod head receiving portion.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Thomas Sea Alt USA, USA 49540 Grand Rapidsfuth Street M DUBRYU 1936, Michigan, USA (56) References: 57-56212 (JP, U) Kai 47-15859 (JP, U)

Claims (2)

[Claims] 1. A flat master plate made of a castable material and one or more metal threaded rods having a threaded shank and a head, wherein the head is within the master plate. Is cast, and in the parent plate type tightening and fixing device in which the shaft portion projects outward from the parent plate, the head plate 22 has the parent plate
Radial protrusion means 36 composed of a plurality of radial protrusions for preventing rotational movement between the radial projection portion 32 and the parent plate 32, and the radial protrusion for preventing axial movement between the parent plate 32. A parent plate type tightening and fixing device, characterized in that it is provided with a circumferentially projecting means (38) consisting of an attachment plate portion between them. 2. A flat master plate made of a castable material and one or more metal threaded rods having a threaded shank and a head, the head being within the master plate. Is cast, and in the parent plate type tightening and fixing device in which the shaft portion projects outward from the parent plate, the head plate 22 has the parent plate
Radial protrusion means 36 composed of a plurality of radial protrusions for preventing rotational movement between the radial projection portion 32 and the parent plate 32, and the radial protrusion for preventing axial movement between the parent plate 32. And a circumferential protruding means (38) consisting of an attachment plate portion between the screw rod and
A parent plate type tightening and fixing device, characterized in that a tool receiving means (44) having a predetermined shape is provided on the tip end portion (24) of the shaft portion (26) to support the shaft (20).