JP2001182727A - Nut, washer, and nut driver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nut, a washer, and a nut driver which can easily and quickly position a nut located in a difficult place to tighten when the cover frame of a manhole is mounted. SOLUTION: The nut has plural wrenching grooves 4 on the circumference of the internal thread, in order to fit to the hooking claws on the side receiving the loads. Also preferably, the side receiving the loads of the nut is formed as an auxiliary to a spherical shape 2 to slide with a washer B. The washer B is formed t a sliding surface 11, to be slid with the spherical shape 2 of the nut and a pipe part 12 joining to the sliding surface 11. The nut driver comprises a pipe 21, which can be inserted into the gap between the hole in a body to be fixed, and the bolt inserting to the hole, and a rotating part therefor. Also the edge of the pipe 21 has plural hooking claws 21a to fit the wrenching grooves 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention makes it possible to easily and quickly install, for example, a cover frame of a manhole for inspection of an underground buried pipe with its top surface aligned with an installation road surface. The present invention relates to a nut / washer and a nut turning tool suitable for the purpose of use, such as.

[0002]

2. Description of the Related Art FIG. 8 is a view showing an embodiment of the present invention. Referring to FIG. 8, the conventional installation method of the lid frame will be described. Stud bolts 51 are provided at a plurality of locations in the circumferential direction. On the other hand, a bolt hole 5 through which each of the plurality of stud bolts 51 is inserted is formed in a flange 52 provided on the inner peripheral surface of the lid frame N of the lid (not shown) of the manhole M.
2a are provided at a plurality of locations. The top surface of the installed lid frame N needs to be aligned with the installation road surface G as shown in the figure.

A conventional method for installing the lid frame N in such an aligned state will be described below. First, although not shown, a lower nut for supporting the flange 52 is screwed into each stud bolt 51 and temporarily fixed at a predetermined height position. It is not easy to align the temporary fixing positions so that all nuts have exactly the same height, even if, for example, an appropriate positioning jig is used. In particular,
This is even more so when the road surface is inclined.

Therefore, for the time being, the flange 52 of the lid frame N is mounted on a group of temporary fixing nuts having irregular heights in a state where the stud bolts 51 are inserted through the bolt holes 52a. In this state, there are nuts that do not adhere to the back surface of the lid frame N, and the lid frame N
It is normal that the vehicle is slightly inclined with respect to the installation road surface or is displaced up and down.

[0005] Then, next, the height position adjustment operation of each lower nut, and therefore, the top surface of the lid frame N and the installation road surface G
Perform alignment work with To this end, for each of the temporary fixing nuts, if the temporary fixing position is too low, the screw is raised, and if it is too high, the screw is lowered. As is understood from FIG. 8, this nut turning operation is performed with a nut hidden in a narrow gap between the top surface of the manhole M and the flange 52, and, in addition, from the situation of the spot. As a result, it is necessary to take an unnatural posture such as crouching down, and it is difficult to work extremely, and the work is not efficient. This is even more so if the installation road surface G is inclined.

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide, for example, the above-described work for installing a manhole cover frame and the like so that the work can be performed efficiently with as little labor as possible. To provide a nut / washer and a nut turning tool.

[0007]

According to the present invention, there is provided a nut according to the present invention, in which a locking claw provided on a nut turning tool is fitted at a plurality of positions on the periphery of a screw hole on a pressure-receiving end surface of the nut. It is characterized in that a latching concave portion is provided for fitting.
Then, the pressure receiving end surface 2 of the nut A is formed in a spherical end surface, and a spherical sliding contact surface 11 slidingly contacting the spherical end surface 2 is formed.
A washer B composed of a cylindrical portion 12 for supporting the peripheral portion of the sliding contact surface 11 is preferably attached to the nut A. or,
The nut A and the washer B may be formed by press-molding a metal plate including the portion where the female screw of the nut A is formed.

Further, the nut turning tool according to the present invention is for rotating a nut provided with a locking recess at a plurality of positions on the peripheral edge of the screw hole on the pressure receiving end face of the nut, and is used for fixing an object to be fixed. A pipe-shaped main body 21 of a predetermined length having a form in which the tip end side can be inserted into an annular gap g generated between the provided bolt hole and the fixing bolt inserted through the bolt;
A plurality of hooking claws 21a to be fitted into the plurality of hooking recesses 4 provided on the nut, respectively, are protruded from the tip of the pipe-shaped main body 21.
As a rotating means, a handle 22 may be provided on the base end side of the pipe-shaped main body 21 or the like.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 8, the present invention relates to a cover frame N (fixed object) having a short cylindrical shape for a cover (not shown) of a manhole M for inspection of an underground pipe. )
An embodiment of the present invention applied to an installation work in a state where the top surface thereof is aligned with the installation road surface G will be described with reference to the drawings.

In FIG. 8, A is a nut, B is a washer, C is a nut-turning tool (all of which are according to the present invention), 51
Is a stud bolt (fixing bolt), 52 is a flange protruding from the inner peripheral surface of the lid frame N, 52a is a bolt hole through which the stud bolt is inserted, and 53 is a flat washer.

The nut A of this embodiment is made by a method of press-forming a steel sheet, unlike a nut generally used. The form is shown in FIGS. 1 and 2 as a plan view and a longitudinal sectional view.

That is, the nut A has a hexagonal cylindrical shape for hanging a wrench or the like on the lower half side of the outer peripheral surface thereof to be a spanner hooking portion 1. The upper half side and the top surface of the outer peripheral surface of the nut A are formed into a series of spherical surfaces to form a spherical end surface 2. The spherical end surface 2 is a contact end surface with the flange 52. At the periphery of the screw hole a provided in the middle of the spherical end face 2, a cylindrical screw forming part 3 extending downward is continuously provided, and an internal thread 3a for functioning as a nut is provided on the inner peripheral face thereof. ing.

Further, at the peripheral edge of the screw hole a of the spherical end face 2,
At two places, which are 180 degrees apart in the circumferential direction, there are provided downwardly-facing recesses 4 for engaging a hooking claw 21a of a nut turning tool C described later.

The nut A is provided with a washer B shown in FIGS. 3 and 4 as a longitudinal sectional view and a plan view. The washer B includes a spherical sliding contact surface 11 that slides on the spherical end surface 2 of the nut A, and a cylindrical portion 12 that is integrally connected to a peripheral portion of the sliding contact surface 11 and supports the sliding contact surface 11. It is configured. In the middle of the sliding surface 11, a stud bolt 51
And a bolt hole b for passing through.

Both the nut A and the washer B are press-formed using a steel plate as a raw material, and then carburized and quenched to increase the hardness, and the brittleness is improved by a hydrogen embrittlement process. Have been.

In this embodiment, the nut A is recessed as shown in FIG. 8, and it is difficult to work with a normal nut turning tool such as a spanner. For this reason, a special nut turning tool is provided to enable the operation of rotating the nut A to be performed easily and quickly.

As shown in FIGS. 5 and 6, the nut turning tool C of this embodiment comprises a pipe-shaped main body 21 having a predetermined length and a rotating means for the pipe-shaped main body 21, in this case, a rod-shaped handle 22. Consists of Instead of the handle 22, various known rotating means may be used.

The pipe-shaped main body 21 is, as shown in FIG.
The leading end side is inserted into an annular gap g formed between a bolt hole 52a provided in a flange 52 (an object to be fixed) of a lid frame N of a manhole M and a stud bolt 51 inserted through the bolt hole 52a. Shape.

That is, the wall thickness of the pipe-shaped main body 21 is set to a thickness that can sufficiently withstand the bending moment exerted during its rotation. However, the outer peripheral surface of the distal end portion inserted into the narrow annular gap g has a conical surface that gradually narrows toward the distal end.

At the front end (lower end in the figure) of the pipe-shaped main body 21, there are provided hooking claws 21a for fitting into the respective hooking recesses 4 provided at two places of the nut A in the circumferential direction of the end face. It protrudes downward at two places separated by a distance. The pipe-shaped main body 21 is also subjected to carburizing and quenching and hydrogen embrittlement treatment.

Next, a description will be given of a procedure for installing the lid frame N in the state shown in FIG. Manhole M
A plurality of stud bolts 51 are erected in advance on the top surface in an arrangement corresponding to each of the bolt holes 52a of the flange 52. Therefore, first, each stud bolt 51
Then, the lower nuts A for supporting the flanges 52 are screwed respectively, and the washers B are dropped on the nuts A with the sliding surfaces 11 thereof facing downward.

It takes a lot of time and effort to precisely align the height positions of the screwed lower nuts A on the same plane as described above. Performing the alignment work is not efficient.

In view of the above, the flange 52 is mounted on the group of nuts A whose height is slightly irregular, and the stud bolt 51 is inserted through each bolt hole 52a.
I will put it on. However, as described above, in this state, the cover frame N is slightly inclined, the top surface and the installation road surface G are in an inconsistent state, or the nut A which is not in close contact with the back surface of the cover frame N. Usually there is.

Then, an operation of matching the top surface of the lid frame N with the installation road surface G is performed while aligning the lower nut group A at a desired height position. To do this, for each nut A, as shown by the solid and imaginary lines in FIG.
Is inserted into an annular gap g between the inner peripheral surface of the bolt hole 52 a of the flange 52 and the outer peripheral surface of the stud bolt 51. Then, when the lower end of the hook 21a comes into contact with the spherical end face 2 of the nut A, the nut turning tool C is rotated in either the left or right direction.

Then, before turning up to half a rotation, each of the two hooking claws 21a is moved as shown by a virtual line in FIG.
The nut A is dropped into the latching recess 4 by itself. Therefore, if a slight pressing force is applied, the nut turning tool C comes to a state in which the nut turning tool C is securely engaged with the nut A. Thereafter, if the handle 22 of the nut turning tool C is rotated in either the left or right direction, the nut A whose temporary fixing position is too low is screwed up.
The nut A which is too high can be screwed down.

This height adjustment operation of the nut A is different from the conventional operation method described at the beginning, and does not take an unreasonable posture such as looking into the nut hidden under the flange 52, and does not take any posture. It can be done promptly in a comfortable posture without any effort.

When the top surface of the lid frame N is flush with the installation road surface G as a result of this operation, the stud bolts 51 projecting above the flange 52 as shown in FIG. After dropping the flat washer 53, the upper nut A is screwed in with the spherical end face 2 side facing upward. Alternatively, an ordinary nut may be used.

The operation of tightening the upper nuts A is shown in FIG.
As can be understood from FIG. 7, since it can be easily performed using a spanner or the like, there is no need to use the nut turning tool C. Thus, the operation of securely fixing the lid frame N to the predetermined accurate installation position by the plural sets of two upper and lower nuts A is much easier and quicker than the conventional method. I do.

Next, FIG. 9 is an explanatory view showing a case where the top surface of the lid frame N is installed in alignment with the inclined road surface G when the installation road surface G is inclined. In this case, when the height of each nut A on the lower side of the flange 52 is adjusted as described above, the washer B
The flange 52 is tilted to follow the tilt of the flange 52 while always being in contact with the back surface of the inclined flange 52 (universally speaking, the surface of the washer abutting against the fixed object).

The washer B is made to follow itself in this manner because the sliding contact surface 11 of the washer B is in contact with each other.
And the spherical end surface 2 of the nut A together form a spherical surface having the same curvature.

When the flange 52 is inclined, the washer B is also used for the upper nut A as a matter of course, as shown in FIG. As a result, it is not necessary to generate excessive tightening stress on the flange 52. Furthermore, washer B
Due to its shape, it also functions like a "spring washer" to prevent nut loosening.

The nut A, the washer B and the nut turning tool C according to the present invention are not limited to the manhole cover frame as long as they are objects to be fixed in such a condition that the above-mentioned characteristics can be utilized. It does its job well.

[0033]

As is apparent from the above description, if the nut and washer and the nut turning tool according to the present invention are used, for example, the lid frame of a manhole for inspection of underground buried piping can be formed.
When installed at the height of the road surface, practically excellent effects as listed below can be obtained. (A) When performing the work of correctly aligning the height position of the temporarily fixed lower nut group that supports the flange of the lid frame, remove the hard nut that is hidden under the flange and is difficult to work. Can be easily and quickly turned. (B) In particular, when the road surface on which the lid frame is installed is inclined, work can be performed incomparably more efficiently than when a conventional ordinary nut is turned with a spanner. (C) In this case, both the contact surfaces of the special washer having a large thickness and the nut are formed as spherical surfaces having the same curvature, so that the washer is subject to a change in the inclination of the lid frame. Follow and tilt. (D) Therefore, as in the conventional wedge-shaped washer, every time the inclination angle of the object to be fixed is different, the complexity and uneconomicity of preparing a wedge-shaped washer corresponding to this angle can be eliminated.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, and is a plan view of a nut.

FIG. 2 is a vertical cross-sectional view of the nut.

FIG. 3 is a vertical sectional view of the washer according to the first embodiment.

FIG. 4 is a plan view of the washer according to the first embodiment.

FIG. 5 is a partially broken side view of the nut turning tool.

FIG. 6 is a partially cutaway front view and a cross-sectional view of the nut turning tool.

FIG. 7 shows a nut, a washer, and a nut turning tool of the present invention.
It is a partial longitudinal section showing an installation situation when used for installation work of a cover frame of a manhole.

FIG. 8 is a partial vertical sectional view showing a state where the installation of the lid frame has been completed;

FIG. 9 is a diagram corresponding to FIG. 7 when the installation road surface is inclined.

[Explanation of symbols]

 A Nut B Washer C Nut turning tool 1 Spanner hook 2 Spherical end face 3 Screw forming section 3a Female screw 4 Hook recess 11 Sliding contact surface 12 Cylindrical section 21 Pipe body 22 Handle (rotating means) 21a Hook claw M Manhole N Lid frame G Installation road surface 51 Stud bolt (fixing bolt) 52 Flange (fixed object) 52a Bolt hole 53 Flat washer a Screw hole b Bolt hole g Annular gap

Claims (5)

[Claims] 1. A nut having a locking recess for fitting a locking claw provided on a nut turning tool at a plurality of positions on a peripheral edge portion of a screw hole on a pressure receiving end surface of the nut. 2. The pressure receiving end face 2 of the nut A is formed in a spherical end face, and the spherical sliding contact face 1 is in sliding contact with the spherical end face 2.
2. A nut and a washer according to claim 1, wherein a washer (B) comprising a cylindrical portion (12) for supporting a peripheral portion of the sliding contact surface (11) is attached to the nut (A). 3. The nut and the washer according to claim 1, wherein the nut A and the washer B are formed by press-molding a metal plate including a part where the female thread of the nut A is formed. 4. A bolt hole provided in an object to be fixed for rotating a nut provided with a locking concave portion at a plurality of positions on a peripheral edge portion of a screw hole on a pressure receiving end surface of the nut. A pipe-shaped main body 21 of a predetermined length provided with a form capable of penetrating the distal end side into an annular gap g generated between the fixing bolt inserted through the pipe-shaped main body and a rotating means thereof. A plurality of hooking claws 21a to be fitted into respective ones of a plurality of hooking concave portions 4 provided in the nut at a tip end of the nut turning tool. 5. The nut turning tool according to claim 4, wherein said rotating means is a handle provided on a base end side of said pipe-shaped main body.