JPH11325017A - Nut or bolt and fastening device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nut or bolt and a tightening or fastening device therefor having versatile characteristics wherein the nut to be fastened to the bolt such as anchor bolt, the bolt to be threadedly fitted to the anchor bolt are formed into special shapes by which they can not be removed by a conventional wrench or the like. SOLUTION: This nut or bolt has a nut body 1 or bolt head in which the axial circumferential face is formed into a forward tapered or curved shape and a rotational curved face. On the circumferential face of the nut body 1 or the bolt head a flat face 4a, or recessed or projecting part is provided for the engagement with an axially long tool. The fastening tool has an inner face to meet the circumferential face of the nut body 1 or the bolt head.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to prevent theft of equipment installed in the field via foundation bolts and nuts or embedded anchor nuts and bolts, such as various vending machines and parking meters, or The present invention relates to a nut or bolt suitable for preventing a foundation bolt or the like of a steel tower of a high-voltage transmission line from being loosened by mischief, and a fastening tool therefor.

[0002]

2. Description of the Related Art Various vending machines and par-
In a king meter and the like, anchor bolts are protruded and fixed to the foundation concrete on which they are installed, and flanges of equipment such as vending machines are fastened and fixed to the foundation concrete via nuts and anchor bolts. Also, in the tower of the high-voltage transmission line, its legs are similarly fastened and fixed to the foundation concrete via nuts and anchor bolts. However, since such a nut can be easily removed with a widely used spanner or the like, equipment such as a vending machine is stolen, or a nut fixed to an anchor bolt of a steel tower is used. There has been an accident of loosening. In order to solve such a problem, the present applicant has proposed a special nut which is difficult to remove with an ordinary spanner or the like (Japanese Patent Laid-Open No. 7-219780). As shown in FIG. 16, the nut differs from the nut body 1 in which the outer periphery of the shaft is substantially trapezoidal and the outer periphery is formed as a trapezoidal rotating curved surface. A pair of slits 2 and 3 formed orthogonal to the axis are provided at positions different by the height H in the axial direction.

[0003]

However, when the above-mentioned nut has become widespread, its fastening tool has become generalized, and the effect of preventing theft or tampering has diminished. Such a conventional example described above,
Since a pair of stepped slits for mounting a tool are arranged in parallel to the axis, there is a disadvantage that it is difficult to manufacture various kinds of special nuts different from each other. That is, when a pair of stepped slits are formed in a nut having a relatively low height, a change in the height of the step cannot be expected to be too large. At best, the type must be less than an order of magnitude. Then, there is a lack of diversity in forming different types of nuts. Then, this invention solves such a problem, and an object of this invention is to provide a variety of things and a fastening tool with which various kinds of different special nuts or bolts can be manufactured. Take the configuration.

[0004]

According to a first aspect of the present invention, there is provided a nut or bolt having a tapered or tapered curved surface in a radial direction and a rotary curved surface formed on the circumferential surface. A bolt head 1a and a flat surface 4a or a concave groove 4 or a ridge 4b for tool engagement elongated in the axial direction on the peripheral surface of the nut body 1 or the bolt head 1a.
It is provided with. According to this nut or bolt, since the peripheral surface is provided with a flat surface 4a or a concave groove 4 or a ridge 4b for engaging a tool which is elongated in the axial direction, its length, position, size, inclination and the like can be changed. Thus, various kinds of special nuts or bolts different from each other can be manufactured. This makes it impossible for different nut fastening tools or bolt fastening tools to attach and detach the nut or bolt to each other, resulting in a nut or bolt with higher security.

A second aspect of the present invention is that at least three axially elongated flat surfaces 4a or concave grooves 4 for tool engagement are provided on the peripheral surface of the nut body 1 or the bolt head 1a at regular intervals.
Alternatively, the nut or the bolt according to claim 1, wherein the ridge 4b is formed. According to the present invention, the fastening torque can be increased, and the fastening tool can be easily fitted. The invention according to claim 3 is the nut according to claim 1 or 2, wherein the end surface on the axis of the nut main body 1 has a closed bag shape. ADVANTAGE OF THE INVENTION According to this invention, it is difficult to understand that it is a nut itself in appearance, and it becomes more excellent in crime prevention.

According to a fourth aspect of the present invention, there is provided a tool for fastening a nut or a bolt according to the first aspect, wherein the nut body 1 is provided.
Alternatively, the bolt head 1a has a plurality of engaging portions 8 for engaging with the flat surface 4a, the concave groove 4 or the ridge 4b, and the inner surface thereof is substantially aligned with the outer periphery of the nut body 1 or the bolt head 1a. This is a nut or bolt fastening tool including a bowl-shaped grip portion 7 and a handle 9 extending from the grip portion 7. According to this fastening tool, the gripping portion 7 is fitted over the outer periphery of the nut body 1 or the bolt head 1a from the axial direction, and by slightly rotating, the two are engaged to fasten and loosen the nut or bolt. Work can be done quickly and easily. According to a fifth aspect of the present invention, in the nut fastening tool of the fourth aspect, an elongated connecting member and a holding nut 15 having an insertion hole through which the connecting member is inserted are further provided. This is a nut fastening tool in which the tip of the connecting member 14 can be inserted into the hole 16 formed. ADVANTAGE OF THE INVENTION According to this invention, the separation of the nut which has a taper-shaped peripheral surface and a fastening tool in the axial direction can be prevented, and the operation | work of fastening and loosening a nut quickly and reliably can be performed.

[0007]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an example of a nut according to the present invention, and FIG. 2 is a longitudinal sectional view taken along line AA of FIG. The nut body 1 has a trapezoidal outer cross section and a trapezoidal rotating surface, and three axially elongated nuts formed on the outer peripheral surface of the nut body 1 at intervals of 120 degrees. It has a flat surface 4a for engaging with a tool. The flat surface 4a is along the outer peripheral surface. Reference numeral 5 denotes an inner screw of the nut body 1. The nut body 1 may be formed such that the trapezoidal slope is not a straight line but a curved surface slightly convex outward or a curved surface slightly concave inward. In the present invention, the trapezoidal slope includes the curved surface as described above and the straight line as shown in FIG.

FIG. 3 is a plan view showing an example of the nut fastening tool. The fastening tool 6 includes a grip portion 7 having three hook portions 8 for hooking on the three flat surfaces 4 a formed on the nut body 1, and two elongated handle portions 9 extending from the grip portion 7. I have. The grip part 7 is formed in a cylindrical shape, and its inner surface is formed in a ring shape having a shape corresponding to the outer periphery of the nut. That is, the inner periphery of the shaft cross section is substantially trapezoidal, and the inner periphery is formed as a trapezoidal rotation curved surface. And three hooking portions 8 are provided at intervals of 120 degrees inside the flat surface 4a. Each hook 8 is a flat surface 4
It is a ridge having a tip portion that fits the inner surface of the plane in a. Two handle portions 9 extend from the outside of the grip portion 7 in opposite directions. The handle 9 is provided for gripping the nut by hand, but in some cases, the handle 9 may be extended to only one side of the grip 7.
Further, the height may be changed in the middle part in the longitudinal direction, for example, in the form of a step (the axial direction of the grip portion 7 may be changed).
In such a case, when the fastening portion of the anchor bolt approaches the foundation concrete surface, the rotation operation of the handle 9 can be performed at an upper position as far as possible from the foundation concrete surface.

FIG. 4 is a partially broken elevational view showing a state where the nut of FIG. 1 is fastened using the fastening tool of FIG.
FIG. 5 is a plan view showing the fastening tool portion from above. With reference to these drawings, a procedure for fastening a nut to an anchor bolt 11 having a lower portion embedded in a foundation concrete 10 will be described. First, the anchor bolt 11 is inserted into an insertion hole provided in a flange 12 at a lower portion of the device, and the anchor bolt 11 is placed thereon. The nut body 1 is manually screwed through the washer 13. Next, the fastening tool 6 is mounted on the nut body 1 with the respective flat surfaces 4a of the nut body 1 and the respective engaging portions 8 of the fastening tool 6 aligned. The nut 9 is fastened to the anchor bolt 11 by rotating the nut body 1 in the closing direction while pressing the handle 9 of the fastening tool 6 downward. The reason why the handle portion 9 is pressed downward during the rotation is to oppose the grip portion 7 which is pushed upward by the action of the outer peripheral inclined surface of the nut body 1.

However, it is also possible to use a fastening tool that can omit such pressing or can be fastened in a place where pressing is difficult. FIG. 6 is a partially broken elevational view showing a state in which the nut is fastened using such a fastening tool 6, and FIG. 7 is a plan view showing the fastening tool portion from above. Parts similar to those in FIG. 4 are denoted by the same reference numerals. The fastening tool 6 is provided with two elongated connecting members 14 such as small bolts, and a holding nut 15 having two small bolt holes into which the connecting members 14 are screwed and inserted, and having an internal thread at the center. The holding portion 7 is provided with two holes 16 into which the distal end of the connecting member 14 can be inserted. Note that at least one connecting member 14 (and the hole 16 or the like) may be provided, and three or more connecting members 14 may be provided.

When the nut is fastened to the anchor bolt 11 using the fastening tool 6 shown in FIG.
After attaching the holding nut 15 to the anchor bolt 11
Screwed in by hand. Then, while rotating the two connecting members 14 via the holding nuts 15, each hole 16 of the grip portion 7 is rotated.
And the tip thereof is brought into contact with the bottom of the hole 16. Next, when the grip 7 is rotated in the direction in which the nut body 1 closes, the holding nut 15 connected to the grip 7 via the connecting member 14 rotates together with the grip 7 and descends. The grip 7 can be pressed downward regardless of the directional movement position. Therefore, according to the fastening tool 6, the nut can be fastened only by rotating the grip portion 7 without manually pressing the grip portion 7 downward.

FIG. 13 shows a fastening means in a case where the diameter of the nut body 1 is large and it is difficult to manually perform the fastening. That is, this is an example in which the bolt fastening device 17 using hydraulic pressure is used. The bolt fastening device 17 rotates the nut body 1 easily while pulling the shaft of the bolt 24 upward in the drawing. Therefore, the bolt fastening device 17
The apparatus main body 18 is provided with a cylinder portion 21 formed of an annular groove communicating with a hydraulic port 22, and a piston member 20 is mounted thereon in a liquid-tight and vertically movable manner. A flange portion is mounted. An inner screw is formed on the inner surface of the cylindrical portion protruding from the center of the insert 19, and the inner screw is screwed to the upper end of the bolt 24. A hydraulic hose (not shown) is connected to the hydraulic port 22, and the piston 1 is raised by hydraulic pressure to insert the
Pull the top of bolt 24 through 9.

As a result, a gap is formed between the nut body 1 and the plate 25, which is the object to be fastened.
Rotate slightly to eliminate the gap. Next, the nut main body 1 of the present invention is fastened by removing the oil pressure, releasing the tension force of the bolt 24 and removing the bolt fastening device 17. When the nut body 1 is rotated while pulling the bolt 24, the grip portion 7 shown in FIG. 3 may be fitted on the outer periphery of the nut body 1, and the nut body 1 may be rotated via the grip portion 7.

FIG. 8 is a perspective view showing another example of the nut of the present invention, FIG. 9 is a sectional view taken along the line BB, and FIG. 10 is a plan view thereof. The same parts as those in FIG. 1 are denoted by the same reference numerals.
1 is different from the example of FIG. 1 only in that six concave grooves 4 are formed on the outer peripheral surface of the nut main body 1 at intervals of 60 degrees. By increasing the number of the grooves 4 in this manner, the degree of freedom of the holding position of the fastening tool is further increased. The fastening tool applied to this nut has a ridge that matches the groove 4 of the nut.
What is provided on the end face of the engaging portion 8 may be used. Further, the number of the ridges of the engaging portion 8 is set to 60 according to the number of the concave grooves 4.
It may be one formed at six degrees, or three formed at 120 degrees.

FIG. 11 is a perspective view showing another example of the nut of the present invention, and FIG. 12 is a sectional view taken along line CC of FIG. FIG. 1
The same reference numerals are given to the same parts as. This example is shown in FIG.
The only difference from the present embodiment is that six ridges 4b are formed on the outer peripheral surface of the nut body 1 instead of the grooves 4 at intervals of 60 degrees. For this nut, the fastening tool 6 shown in FIG. 3 is further modified and used. That is, instead of the engaging portion 8 in the fastening tool 6 of FIG. 3, a concave groove having a shape corresponding to the ridge 4b is formed at the position. The number of the concave grooves may be three at 120-degree intervals, but may be six at 60-degree intervals. FIG. 14 is a perspective view showing another example of the nut of the present invention, which forms a cap nut. That is, the nut body 1
Is closed at one end in the axial direction, and the closed surface forms a curved surface.

FIG. 15 is a perspective view showing an example of the bolt of the present invention. The bolt head 1a having the shape of the nut shown in FIG. 1 is located at the upper end, and the shaft 1b is integrally formed therewith. Things. These bolts are screwed and fastened to anchor nuts and various bolt holes buried in foundation concrete or the like. At that time, the fastening tool shown in FIG. 3 can be used as it is. As described above, the nut or bolt of the present invention can be fastened using the above-described various fastening tools. Similarly, the nut or bolt can be loosened. The fastening tool 6 shown in FIG.
In this case, the operation may be loosened by operating the nut in the same manner as in the case of fastening the nut except that the rotation direction of the grip 7 is reversed.

[0017]

According to the nut or bolt according to the first aspect of the present invention, the flat surface 4 for engaging a tool which is elongated in the axial direction on the peripheral surface.
a or the concave groove 4 or the ridge 4b, so that various kinds of special nuts or bolts different from each other can be manufactured by changing the length, position, size and the like. This makes it impossible for different nut or bolt fastening tools to attach or detach the nut or bolt to each other, resulting in a nut or bolt with higher security. According to the second aspect of the invention, the fastening torque can be increased, and the fitting of the fastening tool is easy.

According to the invention of the third aspect, it is difficult to recognize that the nut is an external appearance, and the security is further improved. According to the present invention of the nut or bolt fastening tool according to claim 4, the grip portion 7 is provided.
Is fitted onto the outer periphery of the nut body 1 or the bolt head 1a from the axial direction and slightly rotated, so that the two can be engaged to fasten and loosen the nut or bolt easily and quickly. According to the invention of the nut fastening tool according to the fifth aspect, separation of the nut having the tapered peripheral surface and the fastening tool in the axial direction is prevented, and the nut is quickly and reliably fastened.
Loosening work may be performed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a nut according to the present invention.

FIG. 2 is a vertical sectional view taken along the line AA of FIG.

FIG. 3 is a plan view showing an example of a nut fastening tool of FIG. 1;

4 is a partially cutaway elevation view showing a state where the nut of FIG. 1 is fastened using the fastening tool of FIG. 3;

FIG. 5 is a plan view showing the fastening tool part of FIG. 4 from above.

FIG. 6 is a partially broken elevational view showing a state where a nut is fastened by using another fastening tool 6;

FIG. 7 is a plan view showing the fastening tool part of FIG. 6 from above.

FIG. 8 is a perspective view showing another example of the nut of the present invention.

FIG. 9 is a sectional view taken along line BB of FIG. 9;

FIG. 10 is a plan view of FIG. 9;

FIG. 11 is a perspective view showing another example of the nut of the present invention.

FIG. 12 is a sectional view taken along line CC of FIG. 11;

FIG. 13 is a partially sectional perspective view of a bolt fastening device for fastening a nut according to the present invention.

FIG. 14 is a perspective view showing another example of the nut of the present invention.

FIG. 15 is a perspective view of a bolt according to the present invention.

FIG. 16 is a perspective view of a conventional nut.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nut main body 1a Bolt head 1b Shaft part 2 Slit 3 Slit 4 Concave groove 4a Flat surface 4b Convex ridge 5 Inner screw 6 Fastening tool 7 Gripping part 8 Engagement part 9 Pattern part 10 Foundation concrete 11 Anchor bolt 12 Flange 13 Washer 14 Connection Member 15 Holding nut 16 Hole 17 Bolt fastening device 18 Main body 19 Insert 20 Piston member 21 Cylinder 22 Hydraulic port 23 Sleeve 24 Bolt 25 Plate

Claims (5)

[Claims] 1. A nut body 1 or a bolt head 1a having a tapered or tapered curved surface in the radial direction and a circumferential surface formed as a rotating curved surface, and the nut body 1 or the bolt head 1a. A nut or bolt having a flat surface 4a or a concave groove 4 or a convex ridge 4b for engaging a tool elongated in the axial direction on the peripheral surface. 2. The nut body 1 or the bolt head 1a.
The nut or bolt according to claim 1, wherein at least three axially elongated flat surfaces 4 a or concave grooves 4 or ridges 4 b for tool engagement are formed at regular intervals on the peripheral surface. 3. The nut according to claim 1, wherein the nut has a bag-like shape whose axial end face is closed. 4. A tool for fastening a nut or bolt according to claim 1, comprising a plurality of engaging portions 8 for engaging with the flat surface 4a, the concave groove 4 or the convex ridge 4b of the nut body 1 or the bolt head 1a. And a nut or bolt having an inverted bowl-shaped grip portion 7 whose inner surface is substantially aligned with the outer periphery of the nut body 1 or the bolt head 1a, and a handle portion 9 extending from the grip portion 7. Fastening tools. 5. The nut fastening tool according to claim 4,
A nut provided with an elongated connecting member and a holding nut having an insertion hole for inserting the connecting member, and a tip end of the connecting member being able to be inserted into a hole portion formed in the grip portion; Fastening tools.