JP2018132130A - nut - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nut usable without spoiling natural atmosphere of wood in a variety of wooden structures such as a wooden architecture, and enabling smoothly executing a construction work.SOLUTION: A nut 11 having a columnar outer shape is so configured that a bottomed female screw 13 is formed on one end surface, and the female screw 13 is not exposed to the other end surface. The nut 11 does not spoil natural atmosphere of wood because mechanical elements such as a male screw 23 and the female screw 13 are covered when being buried in a circular hole 34 of wood 33. It is possible to prevent corotation by adjusting an inner diameter of the circular hole 34 to be processed in the wood 33, and pressing the nut 11 thereinto. When it is difficult to press in the nut 11, fastening means is provided on the side peripheral surface or one end face (end face on a side to which the female screw 13 is exposed) of the nut 11 so as to prevent corotation. Examples of the fastening means include a knurl and a projection 16.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a nut assumed to be used in various wooden structures including buildings.

  There are various skeleton structures of wooden buildings, but in any case, it is necessary to firmly connect adjacent members to ensure the strength to withstand various loads. For this reason, for connecting the members, techniques such as fitting between the tenon and the tenon hole have been introduced for a long time, and in recent years, metal parts such as bolts and nuts have been widely used. By using such a metal component, it is possible to suppress the cross-sectional defect of the member and to absorb energy with its toughness, which contributes to the improvement of safety.

  FIG. 4 shows an example of a method for connecting two members of a column and a beam using metal parts such as bolts, nuts, and metal fittings. The bracket in this figure has a “U” shape. Insert a bolt from the center of the bracket toward the side of the column, screw the nut into the tip of the bolt that penetrates the side hole of the column, and tighten the bracket. It is drawn to the side of the pillar. After that, when a metal fitting is inserted into the slit of the beam and a drift pin is driven from the side surface of the beam, the column and the beam are connected via the metal fitting.

  One of the metal parts used in wooden construction is a nut. The nut has a simple shape in which a female screw is formed on a small piece of metal and is widely used in various fields. However, a nut having some added value has been proposed as in the following patent document. Among them, Patent Document 1 discloses a decorative fastener part having a bright decorative property. Fastener parts refer to screws, rivets, bolts, nuts, etc., and epoxy resin mixed with light-emitting reflective powder is bonded and fixed to the part exposed to the outside, giving it a decorative feature To do. Note that the epoxy resin is prevented from being peeled off by forming a mounting portion having a slight depth at a position where the epoxy resin is bonded.

  In the next patent document 2, a cap nut that can be easily tightened and loosened even in a narrow space is disclosed. A typical cap nut has a shape that covers the end of the male screw to be screwed in, with the opposite side of the female screw bulging in a columnar or dome shape. A hole is formed, and the square hole has a taper that narrows toward the back. By this square hole, the rotation of the cap nut can be restricted, and the tightening and loosening operation with the mating bolt can be easily performed.

JP 2001-173624 A Japanese Utility Model Publication No. 9-60631

  In wooden buildings, members that become skeletons such as pillars and beams are often covered with interior materials, but in commercial facilities, the members that become skeletons may be exposed indoors in order to appeal to wooden buildings. . In that case, bolts, nuts and metal fittings for fixing the members are also exposed to the room, and the natural atmosphere may be impaired. Bolts and nuts, in particular, should be made inconspicuous as much as possible because they are parts that symbolize artifacts. Although it is possible to cover the bolts and nuts by various methods, this increases the labor during construction and also makes management after construction difficult.

  In FIG. 4, the metal fitting is completely embedded in the member, but the drift pin and the nut are exposed on the surface of the member. Among them, the drift pin has only a slight influence on the aesthetics because the end face of the perfect circle is exposed. However, with regard to the nut, it is inevitable that the tip of the bolt is also exposed as a whole, giving an artificial impression. Although it is possible to cover this with a seal, etc., if the processing is inappropriate, it may worsen the aesthetics.

  The present invention was developed on the basis of such a situation, and can be used in various wooden structures including buildings without damaging the natural atmosphere of the wood, and can perform the construction work smoothly. The purpose is to provide.

  The invention according to claim 1 for solving the above-mentioned problem is that a cylindrical outer shape has a bottomed female screw formed on one end surface thereof, and the female screw is not exposed on the other end surface. It is a featured nut. It is assumed that the nut according to the present invention is embedded in a round hole processed into various kinds of wood such as a pillar or a beam which is a skeleton of a wooden building.

  In addition, the female thread of the nut according to the present invention has a bottom without penetrating both end faces, like a general cap nut. Accordingly, the female screw is exposed only at one end surface, and the other end surface is not exposed at all to the hole connected to the female screw in addition to the female screw. As a result, even when the bolt is screwed onto the nut, the tip of the bolt is completely covered.

  However, the nut according to the present invention is a cylindrical shape with a simple outer shape, unlike a conventional cap nut. Therefore, it can be embedded without any gaps in the round holes processed into wood, and after embedding, it becomes a harmonious appearance in which only the circular shape is exposed on the surface of the wood, and the artificial impression like a conventional nut can be diluted. it can. In the present invention, the outer shape is not limited to a complete columnar shape, and chamfering of corners between the end surface and the side peripheral surface, a groove for construction work, and the like may be provided.

  The invention according to claim 2 considers the convenience at the time of construction, and at least one of the side peripheral surface or the end surface where the female screw is exposed is provided with an adhering means to prevent rotation with the screwed male screw. It is characterized by being. The nut according to the present invention is assumed to be embedded in the round hole as described above. Therefore, if the nut is press-fitted into the round hole, the rotation can be prevented. However, with regard to press-fitting, it is necessary to increase the working accuracy of the work as well as to improve the processing accuracy of the round hole, and it is desirable to provide some fixing means to prevent the rotation as in the present invention.

  Any fixing means may be used as long as it has a function of increasing friction with the round hole and does not prevent the nut from being embedded. However, the fixing means is provided only on the side peripheral surface of the nut or the one end surface on which the female thread is formed, and the fixing means must not be exposed after the nut is embedded in the round hole. The fixing means may be provided on both the side peripheral surface and the one end surface, or may be provided on only one of them.

  The invention described in claim 3 specifies the fixing means, and the fixing means is a knurl. Knurls are a series of extremely shallow grooves arranged at narrow intervals continuously, and are widely used as anti-slip. In the present invention, the knurling is formed on one or both of the side peripheral surface and the one end surface of the nut, thereby increasing the friction when embedded in the round hole and preventing the rotation. In particular, by forming a knurl on one end face, when it is pulled by a screwed bolt, it can bite into the wood and generate a large amount of friction, thereby effectively exerting its function. Note that the knurling is a very shallow groove as described above, and the nut has the same outer shape based on a cylindrical shape.

  The invention according to claim 4 also specifies the fixing means, and the fixing means is a protrusion provided on the end face where the female screw is exposed. These protrusions bite into the bottom of the round hole machined in the wood and prevent the nut from rotating. The protrusion is not provided on the side peripheral surface of the nut in consideration of aesthetics and workability. In addition, the shape, arrangement, and quantity of the protrusions can be freely selected, but it is desirable that the lugs should be able to bite into the wood without difficulty when pulled by a screwed bolt. Specific examples of the protrusion include a wall-like one extending in the circumferential direction and the radial direction and a very thin needle-like one.

  As in the first aspect of the invention, the nut has a cylindrical outer shape, a female screw having a bottom is formed on one end surface thereof, and the female screw is not exposed on the other end surface. When embedded in the hole, mechanical elements such as male and female screws are completely obscured and the natural atmosphere created by the wood is not impaired. It is possible to prevent rotation by adjusting the inner diameter of the round hole and press-fitting a nut.

  As in the invention described in claim 2, by providing the fixing means on the side peripheral surface or one end surface (end surface on which the female screw is exposed), the rotation when screwing the bolt is prevented, and the construction work is smoothly performed. Can be implemented. Specific examples of the fixing means include a knurl as in the invention described in claim 3 and a protrusion as in the invention described in claim 4. The knurl can be provided on both the side peripheral surface and the one end surface, but the protrusion is limited to the one end surface.

The shape example of the nut by this invention and the perspective view which shows the example of use are assumed to construct | assemble the synthetic beam which integrated the wood and the steel plate using a nut. It is a perspective view which shows the example of a shape of the nut by this invention. On the right side of the figure, a state in which a nut is embedded in the wood of FIG. 1 is depicted. FIG. 3 is a perspective view showing an example of the shape of a nut according to the present invention, as in FIG. 2. In the perspective view which shows an example of a prior art, the method of connecting two members, a pillar and a beam, using metal parts, such as a volt | bolt, a nut, and a metal fitting, is drawn.

  FIG. 1 shows an example of the shape of a nut 11 according to the present invention and an example of its use. Here, it is assumed that a composite beam 31 in which a wood 33 and a steel plate 37 are integrated is constructed using the nut 11. . The composite beam 31 is obtained by sandwiching a central steel plate 37 with wood 33. The strength and toughness are increased by the steel plate 37, a natural atmosphere is created by the wood 33 on both sides, and the occurrence of condensation can be suppressed. The timber 33 and the steel plate 37 have the same height, and the end surface of the steel plate 37 is exposed on the upper and lower surfaces of the composite beam 31, but the steel plate 37 cannot be seen from the side surface of the composite beam 31.

  The wood 33 and the steel plate 37 constituting the composite beam 31 should be integrated without interrupting both contact surfaces in order to disperse the load widely, and the use of an adhesive is suitable. However, the adhesive may deteriorate over time, and here, bolts 21 and nuts 11 are used. Inevitably, the bolt 21 and the nut 11 need to be arranged at a narrow interval.

  The bolt 21 has a male screw 23 protruding from a cylindrical head portion 22 and is inserted into a side surface of one wood 33. Then, the male screw 23 of the bolt 21 reaches the opposite wood 33 through the steel plate 37, the nut 11 is screwed there, and then the bolt 21 and the nut 11 are tightened, so that the steel plate 37 is sandwiched between the two woods 33. It is. In addition, in order to insert the male screw 23, a pilot hole 35 is processed on the side surface of the wood 33, and a through hole 38 is similarly formed in the steel plate 37. Furthermore, a concentric round hole 34 is machined in one end side (outside) of the prepared hole 35 of the wood 33 in order to embed the head 22 and the nut 11.

  The nut 11 has a cylindrical outer shape that fits loosely into the round hole 34, and a female screw 13 that engages with the male screw 23 of the bolt 21 is formed at the center of one end surface thereof. The female screw 13 has a bottom and does not reach the other end surface. Therefore, the other end surface of the nut 11 is a simple circular plane having no irregularities. Further, protrusions 16 are provided at two locations on the outer periphery of the female screw 13. The protrusion 16 is attracted when screwed with the bolt 21 and bites into the bottom surface of the round hole 34 to prevent the nut 11 from rotating.

  The protrusion 16 may have any shape as long as it can bite into the bottom surface of the round hole 34. However, it is desirable to finish sharply without increasing the size so that the bite proceeds smoothly. In addition, for the production of the nut 11 according to the present invention, it is suitable to cut out using a lathe. For this reason, the protrusion 16 is often formed in a shape extending in the circumferential direction in consideration of cutting with a lathe.

  A row of side circumferential grooves 15 are provided near the center of the side circumferential surface of the nut 11. The side circumferential groove 15 is used when the nut 11 embedded for some reason is pulled out from the wood 33, and a very thin tool is inserted from the inner circumferential surface of the round hole 34 toward the side circumferential groove 15 to force the nut 11 into force. Displace. Since the side circumferential grooves 15 are completely embedded in the wood 33, the aesthetic appearance is not affected.

  The round hole 34 is finished to an inner diameter in which the nut 11 and the head portion 22 of the bolt 21 are embedded without a gap, and when the tightening is finished, the end surface of the nut 11 and the head portion 22 is not stepped from the side surface of the wood 33. The depth of the round holes 34 is adjusted so that they are aligned. In consideration of workability and aesthetics, the sizes of the nut 11 and the head 22 are aligned in FIG. However, a hexagonal hole 25 is formed at the center of the end face of the head 22 in order to fit a tool. The hexagonal hole 25 has a minimum size in consideration of aesthetics.

  When the bolt 21 and the nut 11 are screwed together to complete the composite beam 31, the end surface of the circular nut 11 is continuously arranged on the side surface of the wood 33. Therefore, the nut 11 functions as a pattern for decorating the side surface of the composite beam 31, is excellent in aesthetics, and does not give a sense of incongruity. Further, the hexagonal hole 25 of the head 22 of the bolt 21 is limited to a part of the center, and can hardly be recognized from a distance. The nut 11 according to the present invention is not limited to this FIG. 1 and can be used at any location of various wooden structures. For example, in FIG.

  FIG. 2 shows an example of the shape of the nut 11 according to the present invention. 2 shows a state in which the nut 11 is embedded in the wood 33 in FIG. First, the nut 11 of “shape example 1” in the upper part of FIG. 2 has a cylindrical outer shape, and has the simplest configuration in which a bottomed female screw 13 is formed at the center of one end surface thereof. By press-fitting, rotation is prevented. Therefore, the round hole 34 needs to be processed with high accuracy according to the outer diameter of the nut 11.

  Next, the nut 11 of “shape example 2” in the middle of FIG. 2 has a configuration in which a knurl 18 is formed on the side peripheral surface. The knurling 18 increases friction with the inner peripheral surface of the round hole 34 and prevents rotation. A side peripheral groove 15 is provided in the center of the side peripheral surface of the nut 11, and the knurl 18 is divided into two at the boundary. Further, the nut 11 of “shape example 3” in the lower part of FIG. 2 has a structure in which a knurl 19 is formed on the entire end face where the female screw 13 is exposed. It bites into the bottom and prevents it from rotating.

  FIG. 3 shows an example of the shape of the nut 11 according to the present invention, as in FIG. In FIG. 3, the protrusions 16 and 17 are provided on the end face where the female screw 13 is exposed, but the structures thereof are different from each other. In the “shape example 4” in the upper part of FIG. 3, the protrusions are provided at two locations along the outer edge of the end face. 16 is provided. In “shape example 5” in the middle of FIG. 3, the protrusion 16 extends in the radial direction with the female screw 13 interposed therebetween. In the “shape example 6” in the lower part of FIG. 3, a separately manufactured pin is inserted into the end face and functions as a protrusion 17. As described above, the protrusions 16 and 17 may have any configuration as long as they can easily bite into the bottom surface of the round hole 34 of the wood 33 and prevent rotation. In FIG. 3, the side circumferential groove 15 is provided only in “shape example 5”.

11 Nut 13 Female thread 15 Side circumferential groove 16 Protrusion (integral molding)
17 Protrusion (pin insertion)
18 Knurl (formed on the side surface)
19 Knurl (formed on one end)
21 Bolt 22 Head 23 Male screw 25 Hexagonal hole 31 Composite beam 33 Wood 34 Round hole 35 Pilot hole 37 Steel plate 38 Through hole

Claims (4)

  A nut having a cylindrical outer shape with a bottomed female screw (13) formed on one end surface thereof, and the female screw (13) not exposed on the other end surface.   2. The nut according to claim 1, wherein at least one of a side peripheral surface and an end surface where the female screw (13) is exposed is provided with a fixing means for preventing rotation with a screwed male screw.   3. A nut according to claim 2, characterized in that the fastening means is a knurling (18 or 19).   3. The nut according to claim 2, wherein the fixing means is a protrusion (16 or 17) provided on an end face where the female screw (13) is exposed.

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