JP3229100U - bolt and nut - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bolt and nut for fastening which can be mainly used for a pipe clamp for temporary construction. SOLUTION: A bolt 9 having a mounting portion 14 at one end of a screw shaft portion 15, a nut 12 screwed into the screw shaft portion 15, and a nut integrally molded at the other end of the screw shaft portion 15 are pulled out. In a bolt nut 17 provided with a disk-shaped overhanging portion 16 for stopping, a small-diameter columnar shaft portion 20 that has not been threaded is provided between the disk-shaped overhanging portion 16 and the screw shaft portion 15. The shaft portion 20 is smaller than the inner diameter of the nut 12, and the length thereof is shorter than the screw hole length of the nut 12, and even when the nut 12 is in contact with the disc-shaped overhanging portion 16, the screw shaft portion 15 is said. It is configured so that it cannot run idle by being screwed with a part of the screw hole of the nut 12. [Selection diagram] Fig. 5

Description

The present invention mainly relates to bolts and nuts for fastening used for pipe clamps for temporary construction.

The bolts and nuts as described above include a bolt having a mounting portion at the base end of the screw shaft portion, a nut screwed into the screw shaft portion, and a nut provided at the free end of the screw shaft portion to prevent the nut from coming off. It has a configuration provided with an overhanging portion, and is generally used as a bolt / nut for fastening a pipe clamp as shown in Patent Document 1. In the conventional bolt nut shown in Patent Document 1, when the nut screwed into the screw shaft portion of the bolt is moved backward and brought into contact with the overhanging portion for retaining the bolt, the nut is brought into contact with the screw shaft portion. It was configured to run idle. That is, the screw shaft portion adjacent to the nut retaining overhang portion is configured with a nut idle rotation portion longer than the screw hole length of the nut. Specifically, the nut idle rotation portion is configured by processing the screw shaft portion into a tapered shape so that the screw thread of the screw shaft portion gradually becomes lower as it approaches the overhanging portion for retaining. ..

Japanese Unexamined Patent Publication No. 2008-133943

In the case of bolts and nuts as shown in Patent Document 1, when the nut is rotated in the screw-back direction by an impact wrench commonly used in the field and moved backward toward the overhanging portion for retaining, the nut is concerned. Will come into contact with the nut retaining overhanging portion in a state of entering the nut idle rotating portion adjacent to the nut retaining overhanging portion. That is, the nut at the retracted limit position that abuts on the overhanging portion for preventing the nut from coming off is in a state where it can idle in the nut idle rotating portion. When the nut in such a state is rotated in the screwing direction to move it to the side where the base end mounting portion is located, the nut in the retracted limit position that abuts on the overhanging portion for preventing the nut from coming off remains as it is. No matter how much it is rotated in the screwing direction at the position, it only spins idle and cannot be screwed to the side where the base end is attached. In other words, by rotating the nut in the screwing direction while pushing the nut out of the free rotating portion of the nut, the nut on the thread where the outer diameter of the tapered screw shaft portion in the free rotating portion of the nut becomes large. Must be inserted into the original screw shaft while engaging, and when the nut in the retracted limit position is screwed, the nut is pushed out from the nut idle rotation part and rotated in the screwing direction. I had to operate it.

The present invention proposes bolts and nuts that can solve the above-mentioned conventional problems, and the bolts and nuts according to the present invention are intended to facilitate understanding of the relationship with the examples described later. , The reference symbols used in the description of the embodiment are shown in parentheses. A bolt (9) having a mounting portion (14) at one end of the screw shaft portion (15) and the screw shaft portion (15). In the bolt nut (17) provided with the nut (12) screwed into the) and the disc-shaped overhang portion (20) integrally molded at the other end of the screw shaft portion (15) to prevent the nut from coming off. An unthreaded small-diameter columnar shaft portion (20) is provided between the disk-shaped overhanging portion (16) and the screw shaft portion (15), and the small-diameter cylindrical shaft portion (20) is the nut (12). ) Is smaller than the inner diameter of the nut (12) and its length is shorter than the screw hole length of the nut (12), and the screw shaft portion (15) is still in contact with the disc-shaped overhanging portion (16). It is configured to be screwed with a part of the screw hole of the nut (12).

In the above-described configuration of the present invention, an unthreaded small-diameter cylindrical shaft portion between the screw shaft portion of the bolt and the disc-shaped overhanging portion is adjacent to the inner surface of the disc-shaped overhanging portion at the end of the bolt. When manufacturing this bolt, the length of the small-diameter cylindrical shaft protruding from the screw shaft is the length required for caulking the disc-shaped overhang, L1 + the screw hole length of the nut. It is necessary to form a length L3 shorter than L2 (for example, about half the length L2) and crimp the length L2 portion in the axial direction and the radial direction from the free end of the small diameter cylindrical shaft portion. A disc-shaped overhang with a large thickness and outer diameter is formed. Between the finished disc-shaped overhang and the screw shaft, the screw hole length of the nut, excluding the length L1 + L3 of the original small-diameter cylindrical shaft and the length L1 used for caulking of the disc-shaped overhang. A small-diameter cylindrical shaft portion having a length L3 shorter than that remains. Before the caulking work, the nut is screwed into the screw shaft portion from the free end of the small diameter cylindrical shaft portion.

The bolts of the bolts and nuts manufactured in this way are tentatively subjected to axial pressing force during caulking of the disc-shaped overhanging portion, and the region adjacent to the disc-shaped overhanging portion of the small-diameter cylindrical shaft portion is compressed and deformed. Even if a deformed portion having a slightly thicker outer diameter occurs, the deformed portion can be accommodated in the small-diameter cylindrical shaft portion without reaching the screw shaft portion. In other words, since there is no deformation of the screw shaft portion adjacent to the small-diameter cylindrical shaft portion, the nut can be easily and surely moved backward to the retractable limit position where it abuts on the inner surface of the disc-shaped overhanging portion even if it is manually rotated. Can be done. Moreover, the nut that has reached the retreat limit position is not in a state of idling around the small-diameter cylindrical shaft portion, but in a state in which a part of the screw hole of the nut is screwed into the screw shaft portion following the small-diameter cylindrical shaft portion. It is not necessary to push the nut in the screw-feeding direction as in the above case, and the nut can be smoothly and surely moved forward simply by rotating the nut in the screwing direction while being in the retracted limit position. Therefore, for example, when the pipe clamp is incorporated into the pipe clamp and used, the pipe clamp fastening operation by the forward movement of the nut can be easily, quickly and surely performed.

FIG. 1 is a side view of a pipe clamp having a conventional basic structure. FIG. 2 is a front view of a pipe clamp having a conventional basic structure. FIG. 3 is a side view showing a bolt and nut before forming a disk-shaped overhanging portion of the bolt and nut according to the present invention. FIG. 4 is a side view of the completed bolt and nut according to the present invention. FIG. 5 is a partially enlarged longitudinal side view of the bolt nut according to the present invention when the nut is in the retracted limit position.

First, the structure of a pipe clamp incorporating a conventional bolt and nut will be described with reference to FIGS. 1 and 2. Reference numeral 1 denotes a receiving seat for receiving the pipe to be fastened, which is composed of a base portion 2 attached to another pipe clamp or a pipe clamp mounting structure, and a rising portion 3 extending diagonally outward from one end of the base portion 2. The inner edge of the receiving seat 1 composed of the base portion 2 and the rising portion 3 is an arc-shaped sandwiching edge 4 for sandwiching the pipe. Reference numeral 5 denotes a holding member for sandwiching the pipe to be fastened with the receiving seat 1, one end of which is pivotally supported by the free end of the rising portion 3 of the receiving seat 1 by a support shaft 6 and has an inner edge. Is an arc-shaped sandwiching edge 7 that sandwiches the pipe.

One end of the bolt 9 of the fastening bolt nut 8 is undulatingly supported by a support shaft 10 parallel to the support shaft 6 at the free end portion of the base 2 of the receiving seat 1, and the free end portion of the pressing member 5 is supported. Is provided with a notch portion 11 into which the bolt 9 can be fitted and detached, and a nut receiving seat 13 for receiving the nut 12 of the fastening bolt nut 8 is formed around the upper side of the notch portion 11. The bolt 9 is provided with a mounting portion 14 at one end, and the support shaft 10 is inserted through the mounting portion 14. The region from the mounting portion 14 to the other end of the bolt 9 is the screw shaft portion 15, and a disc-shaped overhanging portion 16 is concentrically integrated with the free end of the screw shaft portion 15 to prevent the nut 12 from coming off. It is formed.

In use, the nut 12 is rotated with respect to the screw shaft portion 15 in the screw-back direction to move the nut 12 backward to a retractable limit position where it abuts on the disc-shaped overhanging portion 16. In this state, the bolt 9 is rotated outward around the support shaft 10 to separate the screw shaft portion 15 from the notch portion 11 of the pressing member 5 to the outside. Next, the pressing member 5 is opened around the support shaft 6 with respect to the receiving seat 1, and the released receiving seat 1 and the pressing member 5 are fitted into the pipe to be fastened. After correcting the position and orientation of the receiving seat 1 with respect to the pipe to be fastened, the pressing member 5 is closed with respect to the receiving seat 1 around the support shaft 6, and the arc-shaped holding edge 4 of the receiving seat 1 is closed. The pipe to be fastened is sandwiched between the holding member 5 and the arc-shaped holding edge 7, the bolt 9 is rotated inward around the support shaft 10 in this state, and the screw shaft portion 15 is cut into the holding member 5. When the nut 12 is fitted into the portion 11, the nut 12 is rotated in the screwing direction, and the nut 12 closes the pressing member 5 around the support shaft 6 via the nut receiving seat 13, and the receiving seat. The pipe to be fastened is fastened and fixed between the arc-shaped holding edge 4 of 1 and the arc-shaped holding edge 7 of the pressing member 5.

Next, examples of bolts and nuts according to the present invention that can be used in place of the fastening bolts and nuts 8 used in the pipe clamp will be described with reference to FIGS. 3 to 5. The illustrated bolt / nut 17 is composed of a bolt 9 and a nut 12 as in the conventional product. However, to explain the manufacturing procedure of the bolt 9, as shown in FIG. 3, a support shaft is inserted into one end of the round bar-shaped member 18. A flat plate-shaped mounting portion 14 in which a hole 19 is bored is integrally molded, and a small-diameter cylindrical shaft portion 20 slightly smaller than the inner diameter of the nut 12 (inner diameter of the through screw hole) is formed at the other end of the round bar-shaped member 18. A screw shaft portion 15 is formed by thread cutting in a region of the round bar-shaped member 18 from the small diameter cylindrical shaft portion 20 to a position near the mounting portion 14. The length of the small-diameter cylindrical shaft portion 20 is a length L1 required for caulking the disk-shaped overhanging portion 16 described later + a length L3 shorter than the screw hole length L2 of the nut 12 (for example, about half the length of L2). ).

Next, as shown in FIG. 3, when the nut 12 is screwed into the screw shaft portion 15 from the small diameter cylindrical shaft portion 20 side, the length L1 portion from the free end of the small diameter cylindrical shaft portion 20 is defined as the axial direction. As shown in FIG. 4, a disk-shaped overhanging portion 16 having a required thickness and an outer diameter is formed by caulking in the radial direction. Between the finished disc-shaped overhanging portion 16 and the screw shaft portion 15, a nut obtained by removing the length L1 used for caulking of the disc-shaped overhanging portion 16 from the length L1 + L3 of the original small-diameter cylindrical shaft portion 20. A small-diameter cylindrical shaft portion 20 having a length L3 shorter than the screw hole length L2 of 12 remains. Since the small-diameter cylindrical shaft portion 20 exists between the disc-shaped overhanging portion 16 and the screw shaft portion 15, the shaft for caulking the disc-shaped overhanging portion 16 at the end of the small-diameter cylindrical shaft portion 20. The directional compressive force does not reach the screw shaft portion 15, and there is no screw portion that is compressed and deformed in the axial direction in the terminal region of the screw shaft portion 15 on the disk-shaped overhanging portion 16 side.

By using the bolt nut 17 configured as described above in place of the fastening bolt nut 8 used for the pipe clamps shown in FIGS. 1 and 2, the nut 12 comes into contact with the disk-shaped overhanging portion 16. When screwed back to the retracted limit position, as shown in FIG. 5, about half from the outer end of the screw hole of the nut 12 is loosely fitted into the small diameter cylindrical shaft portion 20 having a length L3, and the screw hole of the nut 12 is screwed back. Only about half from the inner end is screwed into the screw shaft portion 15. Therefore, when the pipe clamp in which the bolt nut 17 is incorporated is used, when the nut 12 is screwed back to the retractable limit position where it abuts on the disk-shaped overhanging portion 16, the screw shaft portion 15 is compressed and deformed in the axial direction as in the conventional case. Since there is no end region of the nut 12, even if the nut 12 is strongly retracted with an impact wrench, the nut 12 does not bite into the end region of the screw shaft portion 15 that has been compressed and deformed in the axial direction.

In other words, the nut 12 can be easily and surely moved backward to the retracted limit position even by turning it by hand. Further, even when the nut 12 in the retracting limit position is rotated in the screwing direction to move forward, a part of the screw hole of the nut 12 is screwed into the screw shaft portion 15, so that it is instantaneous and reliable. The nut 12 can be moved forward, and the entire nut 12 does not run idle in the long small-diameter cylindrical shaft portion 20.

The bolts and nuts of the present invention can be used as bolts and nuts for fastening mainly used for pipe clamps for temporary construction.

1 Receiving seat 2 Base 3 Rising part 4, 7 Arc-shaped holding edge 5 Holding member 6, 10 Support shaft 8 Fastening bolt Nut 9 Bolt 11 Notch 12 Nut 13 Nut receiving seat 14 Mounting part 15 Screw shaft part 16 Disc shape Overhanging part 17 Bolt nut 18 Round bar-shaped member 19 Support shaft insertion hole 20 Small diameter cylindrical shaft part

Claims (1)

It is provided with a bolt having a mounting portion at one end of the screw shaft portion, a nut screwed into the screw shaft portion, and a disc-shaped overhang portion integrally molded at the other end of the screw shaft portion to prevent the nut from coming off. In a bolt and nut, an unthreaded small-diameter columnar shaft portion is provided between the disk-shaped overhanging portion and the screw shaft portion, and the small-diameter cylindrical shaft portion is smaller than the inner diameter of the nut and its length is smaller. A bolt that is shorter than the screw hole length of the nut and is configured so that the screw shaft portion is screwed with a part of the screw hole of the nut and cannot run idle even when the nut is in contact with the disk-shaped overhanging portion. nut.

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